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WO2023028864A1 - 泄压装置、电池单体、电池及用电设备 - Google Patents

泄压装置、电池单体、电池及用电设备 Download PDF

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Publication number
WO2023028864A1
WO2023028864A1 PCT/CN2021/115766 CN2021115766W WO2023028864A1 WO 2023028864 A1 WO2023028864 A1 WO 2023028864A1 CN 2021115766 W CN2021115766 W CN 2021115766W WO 2023028864 A1 WO2023028864 A1 WO 2023028864A1
Authority
WO
WIPO (PCT)
Prior art keywords
groove
pressure relief
scoring
segment
grooves
Prior art date
Application number
PCT/CN2021/115766
Other languages
English (en)
French (fr)
Inventor
顾明光
陈小波
李耀
王学辉
郝浴沧
Original Assignee
宁德时代新能源科技股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 宁德时代新能源科技股份有限公司 filed Critical 宁德时代新能源科技股份有限公司
Priority to JP2023502626A priority Critical patent/JP7514380B2/ja
Priority to EP21948694.1A priority patent/EP4167368A4/en
Priority to PCT/CN2021/115766 priority patent/WO2023028864A1/zh
Priority to CA3183528A priority patent/CA3183528A1/en
Priority to CN202180066181.6A priority patent/CN116438702A/zh
Priority to KR1020237003696A priority patent/KR20230035342A/ko
Priority to KR1020237016558A priority patent/KR20230088460A/ko
Priority to JP2023528257A priority patent/JP2023549795A/ja
Priority to EP22863534.8A priority patent/EP4340112A1/en
Priority to CN202280009602.6A priority patent/CN116711134A/zh
Priority to PCT/CN2022/116298 priority patent/WO2023030404A1/zh
Priority to CN202280010076.5A priority patent/CN116783763A/zh
Priority to CN202222326423.5U priority patent/CN218769952U/zh
Priority to KR1020237015526A priority patent/KR20230084541A/ko
Priority to PCT/CN2022/116275 priority patent/WO2023030399A1/zh
Priority to EP22863540.5A priority patent/EP4287380A1/en
Priority to CN202280005459.3A priority patent/CN116075964A/zh
Priority to KR1020237016596A priority patent/KR20230088468A/ko
Priority to JP2023530008A priority patent/JP2023549907A/ja
Priority to CN202222314334.9U priority patent/CN218414924U/zh
Priority to CN202222314407.4U priority patent/CN218414925U/zh
Priority to EP22863539.7A priority patent/EP4239777A1/en
Priority to JP2023530006A priority patent/JP2023549906A/ja
Priority to PCT/CN2022/116299 priority patent/WO2023030405A1/zh
Publication of WO2023028864A1 publication Critical patent/WO2023028864A1/zh
Priority to US18/187,207 priority patent/US20230223644A1/en
Priority to US18/333,167 priority patent/US20230327275A1/en
Priority to US18/464,845 priority patent/US20230420793A1/en
Priority to US18/413,080 priority patent/US20240154240A1/en

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/30—Arrangements for facilitating escape of gases
    • H01M50/342—Non-re-sealable arrangements
    • H01M50/3425—Non-re-sealable arrangements in the form of rupturable membranes or weakened parts, e.g. pierced with the aid of a sharp member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/40—Safety valves; Equalising valves, e.g. pressure relief valves with a fracturing member, e.g. fracturing diaphragm, glass, fusible joint
    • F16K17/403—Safety valves; Equalising valves, e.g. pressure relief valves with a fracturing member, e.g. fracturing diaphragm, glass, fusible joint with a fracturing valve member
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/14—Primary casings; Jackets or wrappings for protecting against damage caused by external factors
    • H01M50/143—Fireproof; Explosion-proof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • H01M50/148—Lids or covers characterised by their shape
    • H01M50/15—Lids or covers characterised by their shape for prismatic or rectangular cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/247—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders specially adapted for portable devices, e.g. mobile phones, computers, hand tools or pacemakers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/249—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders specially adapted for aircraft or vehicles, e.g. cars or trains
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2200/00—Safety devices for primary or secondary batteries
    • H01M2200/20—Pressure-sensitive devices
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/30—Batteries in portable systems, e.g. mobile phone, laptop
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present application relates to the technical field of batteries, in particular, to a pressure relief device, a battery cell, a battery and electrical equipment.
  • Batteries are widely used in electronic equipment, such as mobile phones, laptop computers, battery cars, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes and electric tools, etc.
  • a pressure relief device In battery technology, in order to ensure the safety of the battery cell, a pressure relief device is generally installed in the battery cell. When the inside of the battery cell or when the temperature reaches a threshold, the pressure relief device breaks at the position where the notch groove is set, so that Release the pressure inside the battery cell. For a general pressure relief device, pressure relief may also occur when the internal pressure of the battery cell is within a normal range, and the long-term reliability is poor.
  • Embodiments of the present application provide a pressure relief device, a battery cell, a battery, and electrical equipment, which can effectively improve the long-term reliability of the pressure relief device.
  • the embodiment of the present application provides a pressure relief device, including: a pressure relief body, including a pressure relief portion, the pressure relief portion has opposite first and second surfaces in its thickness direction; Score grooves are sequentially arranged on the pressure relief part along the direction from the first surface to the second surface, and among the two adjacent score grooves in the thickness direction, the score grooves far away from the first surface The maximum width of the scored grooves is smaller than the minimum width of the scored grooves proximate to the first surface.
  • the pressure relief part is provided with a plurality of scoring grooves, and the multiple scoring grooves are arranged on the pressure relief part in sequence along the direction from the first surface to the second surface of the pressure relief part, and the thickness of the pressure relief part Among the two adjacent scoring grooves in the direction, the maximum width of the scoring groove far away from the first surface is smaller than the minimum width of the scoring groove close to the first surface.
  • the pressure relief device of this structure adopts a multi-level scoring groove structure , can reduce the forming force on the pressure relief part when forming each level of scoring groove, and reduce the risk of cracks in the pressure relief part. Long-term reliability of pressure relief devices.
  • the plurality of scoring grooves include a first scoring groove and a second scoring groove extending in the same direction, and the first scoring groove is disposed on a bottom surface of the second scoring groove.
  • the extension direction of the first notch groove is consistent with the extension direction of the second notch groove, and the first notch groove is arranged on the bottom surface of the second notch groove.
  • this structure is convenient for the first notch groove Forming ensures the length of the first scoring groove, on the other hand, it can ensure that the maximum width of the first scoring groove is smaller than the minimum width of the second scoring groove.
  • the plurality of scoring grooves further include a third scoring groove, the third scoring groove is disposed on the first surface, and the second scoring groove is disposed on the third groove. bottom of the groove.
  • the plurality of scoring grooves further includes a third scoring groove arranged on the first surface, and the second scoring groove is arranged on the bottom surface of the third scoring groove, that is to say, three grooves are arranged on the pressure relief part.
  • Level scoring grooves ensure that the forming force on the pressure relief part will not be too large when forming each level of score grooves, reducing the risk of cracks in the pressure relief part.
  • the bottom surface of the third scoring groove is provided with a plurality of second scoring grooves.
  • a plurality of second notch grooves are provided on the bottom surface of the third notch groove, so that the pressure relief part can be ruptured at the position of each second notch groove to realize pressure relief, which has a better pressure relief effect, Increased pressure release rate.
  • one third scoring groove corresponds to multiple second scoring grooves, the molding process can be simplified and the molding cost can be reduced.
  • the plurality of second scoring grooves include a first groove segment, a second groove segment and a third groove segment, the first groove segment and the second groove segment are arranged at intervals, the first groove segment Both a groove section and the second groove section intersect with the third groove section;
  • the pressure relief part includes an opening area jointly defined by the first groove section, the second groove section and the third groove section, the The opening area is configured to open with the first groove segment, the second groove segment and the third groove segment as boundaries.
  • the first groove section and the second groove section are arranged at intervals, the second groove section and the second groove section both intersect the third groove section, and the first groove section, the second groove section and the third groove section jointly define Out of the opening area, after the pressure relief part breaks at the position of the first groove section, the second groove section and the second groove section, the part of the pressure relief part located in the opening area will open for pressure relief, increasing the pressure relief area of the pressure relief part , improving the pressure relief rate of the pressure relief part.
  • the plurality of second scoring grooves further includes a fourth groove segment, and in the extending direction of the third groove segment, the fourth groove segment is located between the first groove segment and the Between the second slot segments, the fourth slot segment intersects the third slot segment.
  • the fourth groove section located between the first groove section and the second groove section intersects with the third groove section, and the stress of the pressure relief part is more concentrated at the intersection of the third groove section and the fourth groove section, and more It is easy to break, so that the pressure relief part breaks along the third groove segment from the position where the third groove segment intersects with the fourth groove segment during the pressure relief process, and along the first groove segment and the second groove segment after the third groove segment is broken. Slot sections rupture for quick pressure relief.
  • the distance from the intersection of the fourth slot segment and the third slot segment to the first slot segment is equal to the distance between the fourth slot segment and the The distance from the intersection position of the third slot segment to the second slot segment.
  • the distance from the intersection of the fourth groove segment and the third groove segment to the first groove segment is equal to the distance from the intersection position of the fourth groove segment and the third groove segment to the second groove segment, so that the pressure relief part can After the position where the fourth groove segment intersects with the third groove segment is broken along the third groove segment, it is simultaneously broken along the first groove segment and the second groove segment.
  • the first groove segment, the second groove segment and the third groove segment define two open areas, and the two open areas are respectively located on two sides of the third groove segment.
  • the first groove section, the second groove section and the third groove section define two opening areas, and the two opening areas are respectively located on both sides of the third groove section.
  • the parts of the pressure part in the two pressure relief areas can be opened for pressure relief in a split manner, which can effectively increase the pressure relief rate of the pressure relief part.
  • the second surface is provided with a notch groove located in the opening area, and there is a distance between the notch groove and the third groove segment along the extending direction of the first groove segment.
  • the gap groove has a distance from the third groove segment in the extension direction of the first groove segment, and at least part of the gap groove is located in the opening area, so that the pressure relief part is in the pressure relief process, and the pressure relief part is located in the opening area
  • a part of the pressure relief part can be turned around with the position of the pressure relief part in the notch groove as an axis, so that it is easier to open the pressure relief.
  • the distance between the first surface and the second surface is H0
  • the distance from the bottom surface of the scoring groove closest to the second surface to the second surface is H1
  • H0 and H1 satisfy Relational formula: H1/H0 ⁇ 0.2.
  • the ratio of the distance from the bottom surface of the scoring groove closest to the second surface to the second surface to the distance from the first surface to the second surface is less than 0.2, so that the bottom surface of the scoring groove closest to the second surface and The thickness of the portion between the second surfaces accounts for a relatively small proportion of the total thickness of the pressure relief portion, so that the portion between the bottom surface of the scoring groove closest to the second surface and the second surface can be normally ruptured to realize pressure relief .
  • the distance from the bottom surface of the scoring groove closest to the second surface to the second surface is H1, and H1 satisfies the relationship H1 ⁇ 0.5 mm.
  • the distance from the bottom surface of the scoring groove closest to the second surface to the second surface is less than 0.5mm, so that the part between the bottom surface of the scoring groove closest to the second surface and the second surface
  • the thickness is small, easy to rupture and release pressure.
  • the depth of the scoring groove disposed on the first surface is H2, and H2 satisfies the relationship H2 ⁇ 1mm.
  • the depth of the score groove provided on the first surface is less than 1mm, so that the depth of the score groove on the outermost side of the pressure relief part is smaller, which reduces the pressure relief part during the forming process of the score groove.
  • the molding force received reduces the risk of cracks in the pressure relief part.
  • the depth of the notch groove between the notch groove closest to the second surface and the notch groove disposed on the first surface is H3, and H3 satisfies the relationship H3 ⁇ 1.5 mm.
  • the depth of the notch groove between the notch groove closest to the second surface and the notch groove provided on the first surface is less than 1.5 mm, so that all but the notch closest to the second surface on the pressure relief part.
  • the grooves and the grooves other than the grooves arranged on the first surface have a smaller depth, which reduces the molding force on the pressure relief part during the molding process and reduces the risk of cracks in the pressure relief part.
  • an accommodation space is formed inside the pressure relief body, the pressure relief body has a plurality of walls defining the accommodation space, the accommodation space is used to accommodate the electrode assembly, and the plurality of walls One of the walls is formed with the pressure relief portion.
  • a plurality of walls of the pressure relief body define an accommodation chamber for accommodating the electrode assembly, and one of the plurality of walls is formed with a pressure relief portion, so that the pressure relief device not only has the accommodation function of accommodating the electrode assembly, but also With pressure relief function.
  • the multiple walls include a peripheral wall and a bottom wall, the peripheral wall surrounds the edge of the bottom wall, the peripheral wall and the bottom wall jointly define the accommodation space, and the bottom wall The pressure relief portion is formed.
  • the bottom wall of the pressure relief body is formed with a pressure relief portion, so that the bottom wall has a good pressure relief function.
  • the peripheral wall and the bottom wall are integrally formed.
  • the surrounding wall and the bottom wall are integrally formed, so that the surrounding wall and the bottom wall with the pressure relief function have good firmness.
  • This integrated design can simplify the molding process. reduce manufacturing cost.
  • the first surface is an outer surface of the bottom wall.
  • the first surface is the outer surface of the bottom wall, which is convenient for processing scoring grooves on the pressure relief body.
  • an embodiment of the present application provides a battery cell, including the pressure relief device provided in any one embodiment of the first aspect.
  • a battery in a third aspect, includes: the battery cell provided in any one embodiment of the second aspect; and a box for accommodating the battery cell.
  • an electric device includes the battery provided in any one embodiment of the third aspect.
  • an embodiment of the present application provides a method for manufacturing a pressure relief device, the method including: providing a pressure relief body, the pressure relief body includes a pressure relief portion, and the pressure relief portion has opposite thicknesses in its thickness direction.
  • the first surface and the second surface of the pressure relief part; a plurality of scoring grooves are sequentially processed along the direction from the first surface to the second surface on the pressure relief part; two adjacent in the thickness direction Among the scoring grooves, the maximum width of the scoring groove far away from the first surface is smaller than the minimum width of the scoring groove close to the first surface.
  • sequentially processing a plurality of scoring grooves on the pressure relief part along the direction from the first surface to the second surface comprises: on the pressure relief part along the first surface A plurality of scoring grooves are sequentially punched from the first surface to the second surface.
  • a plurality of scoring grooves are sequentially formed on the pressure relief part in the direction from the first surface to the second surface by stamping. Reduce the risk of cracks in the pressure relief part.
  • the embodiment of the present application provides a manufacturing equipment of a pressure relief device, including: a first providing device for providing a pressure relief body, the pressure relief body includes a pressure relief part, and the pressure relief part has a thickness of There are opposite first surfaces and second surfaces in the direction; and a processing device is used to sequentially process a plurality of scoring grooves on the pressure relief part along the direction from the first surface to the second surface; wherein , among the two adjacent scoring grooves in the thickness direction, the maximum width of the scoring groove far away from the first surface is smaller than the minimum width of the scoring groove close to the first surface.
  • Fig. 1 is a schematic structural diagram of a vehicle provided by some embodiments of the present application.
  • Fig. 2 is a schematic structural diagram of a battery provided by some embodiments of the present application.
  • Fig. 3 is an exploded view of a battery cell provided by some embodiments of the present application.
  • Fig. 4 is a schematic structural diagram of a pressure relief device provided by some embodiments of the present application.
  • Fig. 5 is a cross-sectional view of the pressure relief part shown in Fig. 4;
  • Fig. 6 is a partial view of a pressure relief device provided in some other embodiments of the present application.
  • Fig. 7 is a cross-sectional view of the pressure relief part shown in Fig. 6;
  • Fig. 8 is a positional relationship diagram of the first notch groove, the second notch groove and the third notch groove shown in Fig. 6;
  • Fig. 9 is a schematic structural diagram of a pressure relief device provided in some other embodiments of the present application.
  • Fig. 10 is a flowchart of a manufacturing method of a pressure relief device provided by some embodiments of the present application.
  • Fig. 11 is a schematic block diagram of the manufacturing equipment of the pressure relief device provided by some embodiments of the present application.
  • Icons 10-box; 11-first part; 12-second part; 20-battery unit; 21-housing; 22-electrode assembly; 221-positive tab; 222-negative tab; 23-end cover 231-positive electrode terminal; 232-negative electrode terminal; 24-insulator; 25-pressure relief device; 251-pressure relief body; 2511-pressure relief part; 2511a-first surface; 2512-surrounding wall; 2513-bottom wall; 252-scoring groove; 2521-the first scoring groove; 2522-the second scoring groove; 2522a-the first groove segment; 2522b-the second groove segment; 2522c- 2522d-the fourth groove section; 2523-the third scoring groove; 253-notched groove; 26-collecting member; 100-battery; 200-controller; 300-motor; 1000-vehicle; Manufacturing equipment; 2100-providing device; 2200-processing device.
  • connection In the description of this application, it should be noted that, unless otherwise clearly stipulated and limited, the terms “installation”, “connection”, “connection” and “attachment” should be understood in a broad sense, for example, it may be a fixed connection, It can also be detachably connected or integrally connected; it can be directly connected or indirectly connected through an intermediary, and it can be internal communication between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in this application according to specific situations.
  • “Plurality” in this application refers to two or more (including two).
  • the battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, which are not limited in the embodiments of the present application.
  • the battery cell can be in the form of a cylinder, a flat body, a cuboid or other shapes, which is not limited in this embodiment of the present application.
  • Battery cells are generally divided into three types according to packaging methods: cylindrical battery cells, square battery cells and pouch battery cells, which are not limited in this embodiment of the present application.
  • the battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.
  • the battery mentioned in this application may include a battery module or a battery pack, and the like.
  • Batteries generally include a case for enclosing one or more battery cells. The box can prevent liquid or other foreign objects from affecting the charging or discharging of the battery cells.
  • the battery cell includes an electrode assembly and an electrolyte, and the electrode assembly is composed of a positive pole piece, a negative pole piece and a separator.
  • a battery cell works primarily by moving metal ions between the positive and negative pole pieces.
  • the positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer, the positive electrode active material layer is coated on the surface of the positive electrode current collector, and the positive electrode collector without the positive electrode active material layer protrudes from the positive electrode collector coated with the positive electrode active material layer. Fluid, the positive electrode current collector not coated with the positive electrode active material layer is used as the positive electrode tab.
  • the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobaltate, lithium iron phosphate, ternary lithium or lithium manganate.
  • the negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, the negative electrode active material layer is coated on the surface of the negative electrode current collector, and the negative electrode collector without the negative electrode active material layer protrudes from the negative electrode collector coated with the negative electrode active material layer. Fluid, the negative electrode current collector not coated with the negative electrode active material layer is used as the negative electrode tab.
  • the material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon or silicon.
  • the number of positive pole tabs is multiple and stacked together, and the number of negative pole tabs is multiple and stacked together.
  • the material of the isolation film may be PP (polypropylene, polypropylene) or PE (polyethylene, polyethylene).
  • the electrode assembly may be a wound structure or a laminated structure, which is not limited in the embodiment of the present application.
  • the pressure relief device on the battery cell has an important impact on the safety of the battery. For example, when a short circuit, overcharge, etc. occur, it may cause thermal runaway inside the battery cell, resulting in a sudden increase in pressure or temperature. In this case, the internal pressure and temperature can be released to the outside through the actuation of the pressure relief mechanism, so as to prevent the battery cells from exploding and igniting.
  • the pressure relief device will also release pressure when the internal pressure of the battery cell is within a normal range, resulting in failure of the battery cell.
  • the pressure relief device is generally provided with notched grooves on the pressure relief body. In order to ensure that the pressure relief device can release the pressure normally when the internal pressure or temperature of the battery cell reaches the threshold value, the notched groove needs to be processed deeper. After the notched groove on the pressure relief body is formed, cracks are likely to occur, and the internal pressure of the battery cell is within the normal range (not reaching the threshold) and the pressure relief device releases the pressure.
  • an embodiment of the present application provides a pressure relief device, in which a plurality of scoring grooves are sequentially arranged on the pressure relief part of the pressure relief body in the direction from the first surface to the second surface, and in the thickness direction of the pressure relief part Among the two adjacent scoring grooves, the maximum width of the scoring groove far away from the first surface is smaller than the minimum width of the scoring groove close to the first surface.
  • the multi-stage notched groove structure can reduce the forming force on the pressure relief part when forming the notched grooves of each stage, and reduce the risk of cracks in the pressure relief part.
  • the pressure part fails due to cracks at the position where the notch groove is set, which improves the long-term reliability of the pressure relief device.
  • Electrical devices can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys and power tools, etc.
  • Vehicles can be fuel vehicles, gas vehicles or new energy vehicles, and new energy vehicles can be pure electric vehicles, hybrid vehicles or extended-range vehicles;
  • spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.;
  • electric toys include fixed Type or mobile electric toys, such as game consoles, electric car toys, electric boat toys and electric airplane toys, etc.;
  • electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, for example, Electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, electric planers, and more.
  • the embodiment of the present application does not impose special limitations on the above electric equipment.
  • FIG. 1 is a schematic structural diagram of a vehicle 1000 provided by some embodiments of the present application;
  • the battery 100 can be used for power supply of the vehicle 1000 , for example, the battery 100 can be used as an operating power source of the vehicle 1000 .
  • the vehicle 1000 may further include a controller 200 and a motor 300 , the controller 200 is used to control the battery 100 to supply power to the motor 300 , for example, for starting, navigating and running the vehicle 1000 .
  • the battery 100 can not only be used as an operating power source for the vehicle 1000, but also can be used as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.
  • FIG. 2 is a schematic structural diagram of a battery 100 provided by some embodiments of the present application.
  • the battery 100 includes a box body 10 and a battery cell 20 .
  • the box body 10 is used to accommodate the battery cell 20 .
  • the box body 10 is a component for accommodating the battery cell 20
  • the box body 10 provides a storage space for the battery cell 20
  • the box body 10 may have various structures.
  • the box body 10 may include a first part 11 and a second part 12 , and the first part 11 and the second part 12 cover each other to define a storage space for accommodating the battery cells 20 .
  • the first part 11 and the second part 12 can be in various shapes, such as cuboid, cylinder and so on.
  • the first part 11 can be a hollow structure with one side open, and the second part 12 can also be a hollow structure with one side open.
  • the open side of the second part 12 is covered with the open side of the first part 11 to form a box with accommodating space.
  • first part 11 is a hollow structure with one side open
  • second part 12 is a plate-like structure
  • the second part 12 covers the open side of the first part 11 to form a box body 10 with a receiving space.
  • the first part 11 and the second part 12 can be sealed by a sealing element, and the sealing element can be a sealing ring, a sealant, or the like.
  • the battery 100 there may be one or a plurality of battery cells 20 . If there are multiple battery cells 20 , the multiple battery cells 20 may be connected in series, in parallel or in parallel.
  • the mixed connection means that the multiple battery cells 20 are both in series and in parallel.
  • a plurality of battery cells 20 may be connected in series or in parallel or mixed to form a battery module, and then a plurality of battery modules may be connected in series or in parallel or mixed to form a whole and accommodated in the box 10 . It is also possible that all the battery cells 20 are directly connected in series, parallel or mixed together, and then all the battery cells 20 are housed in the case 10 as a whole.
  • the battery 100 may further include a confluence component, through which the plurality of battery cells 20 may be electrically connected, so as to realize series connection, parallel connection or mixed connection of the plurality of battery cells 20 .
  • the bus component may be a metal conductor, such as copper, iron, aluminum, stainless steel, aluminum alloy, and the like.
  • FIG. 3 is an exploded view of a battery cell 20 provided by some embodiments of the present application.
  • the battery cell 20 includes a casing 21 , an electrode assembly 22 , an end cap 23 , an insulator 24 and a pressure relief device 25 .
  • the casing 21 is a component for accommodating the electrode assembly 22, and the casing 21 may be a hollow structure with an opening formed at one end.
  • the housing 21 can be in various shapes, such as cylinder, cuboid and so on.
  • the housing 21 can be made of various materials, such as copper, iron, aluminum, steel, aluminum alloy and so on.
  • Electrodes assemblies 22 there may be one or more electrode assemblies 22 in the housing 21 .
  • there are a plurality of electrode assemblies 22 and the plurality of electrode assemblies 22 are stacked and arranged in the casing 21 .
  • the electrode assembly 22 is a part where electrochemical reactions occur in the battery cell 20 .
  • the electrode assembly 22 may include a positive electrode tab, a negative electrode tab, and a separator.
  • the electrode assembly 22 may be a coiled structure formed by winding a positive pole piece, a separator and a negative pole piece, or a laminated structure formed by stacking a positive pole piece, a separator and a negative pole piece.
  • the positive electrode sheet may include a positive electrode collector and a positive electrode active material layer coated on opposite sides of the positive electrode collector.
  • the negative electrode sheet may include a negative electrode current collector and a negative electrode active material layer coated on opposite sides of the negative electrode current collector.
  • the electrode assembly 22 has a positive pole tab 221 and a negative pole tab 222.
  • the positive pole tab 221 can be the part of the positive pole piece that is not coated with the positive active material layer
  • the negative pole tab 222 can be the part that is not coated with the negative pole active material layer on the negative pole piece. part.
  • the end cap 23 is a component that covers the opening of the casing 21 to isolate the internal environment of the battery cell 20 from the external environment.
  • the end cap 23 covers the opening of the casing 21 , and the end cap 23 and the casing 21 jointly define a sealed space for accommodating the electrode assembly 22 , electrolyte and other components.
  • the shape of the end cap 23 can be adapted to the shape of the housing 21.
  • the housing 21 is a rectangular parallelepiped structure
  • the end cap 23 is a rectangular plate-shaped structure compatible with the housing 21.
  • the housing 21 is a cylinder.
  • the body structure, the end cover 23 is a circular plate-shaped structure suitable for the housing 21.
  • the material of the end cover 23 can also be various, for example, copper, iron, aluminum, steel, aluminum alloy, etc.
  • the material of the end cover 23 and the material of the shell 21 can be the same or different.
  • Electrode terminals can be provided on the end cap 23 , and the electrode terminals are used for electrical connection with the electrode assembly 22 to output the electric energy of the battery cell 20 .
  • the electrode terminals may include a positive electrode terminal 231 and a negative electrode terminal 232 , the positive electrode terminal 231 is used for electrical connection with the positive electrode tab 221 , and the negative electrode terminal 232 is used for electrically connecting with the negative electrode tab 222 .
  • the positive electrode terminal 231 and the positive tab 221 may be directly connected or indirectly connected, and the negative electrode terminal 232 and the negative tab 222 may be directly connected or indirectly connected.
  • the positive electrode terminal 231 is electrically connected to the positive electrode tab 221 through a current collecting member 26
  • the negative electrode terminal 232 is electrically connected to the negative electrode tab 222 through another current collecting member 26 .
  • the insulator 24 is a part separating the casing 21 from the electrode assembly 22 , and the insulation and isolation of the casing 21 and the electrode assembly 22 are realized through the insulator 24 .
  • the insulating member 24 is an insulating material, and the insulating member 24 may be an insulating material such as plastic or rubber.
  • the insulating member 24 covers the outer circumference of the electrode assembly 22 in the circumferential direction. It can be understood that, in the case of multiple electrode assemblies 22 , the insulating member 24 covers the entire outer circumference of the plurality of electrode assemblies 22 in the circumferential direction.
  • the pressure relief device 25 is a component for releasing the pressure inside the battery cell 20 , and when the pressure or temperature inside the battery cell 20 reaches a threshold value, the pressure inside the battery cell 20 is released through the pressure relief device 25 .
  • the pressure relief device 25 may be a component provided on the end cover 23 , or the housing 21 may act as the pressure relief device 25 . The specific structure of the pressure relief device 25 will be described in detail below with reference to the accompanying drawings.
  • Figure 4 is a schematic structural diagram of a pressure relief device 25 provided by some embodiments of the present application
  • Figure 5 is a cross-sectional view of the pressure relief part 2511 shown in Figure 4
  • the pressure relief device 25 includes a pressure relief body 251 and a plurality of scoring grooves 252.
  • the pressure relief body 251 includes a pressure relief portion 2511 having a first surface 2511 a and a second surface 2511 b opposite to each other in a thickness direction thereof.
  • a plurality of scoring grooves 252 are sequentially arranged in the pressure relief portion 2511 along the direction from the first surface 2511a to the second surface 2511b, and in the two adjacent scoring grooves 252 in the thickness direction of the pressure relief portion 2511, away from the first surface
  • the maximum width of the scoring groove 252 of 2511a is smaller than the minimum width of the scoring groove 252 close to the first surface 2511a.
  • the maximum width of the scoring groove 252 away from the first surface 2511a is smaller than the minimum width of the scoring groove 252 close to the first surface 2511a, that is, That is, the widths of the plurality of scoring grooves 252 decrease step by step along the direction from the first surface 2511a to the second surface 2511b.
  • the maximum width of the scoring groove 252 away from the first surface 2511a and the minimum width of the scoring groove 252 close to the first surface 2511a are the dimensions of two adjacent scoring grooves 252 in the same direction.
  • the maximum width of the scoring groove 252 far away from the first surface 2511a does not limit the width of the scoring groove 252 far away from the first surface 2511a among two adjacent scoring grooves 252 to be gradual.
  • the width of the scored groove 252 away from the first surface 2511 a may also be referred to as the maximum width.
  • the minimum width of the scoring groove 252 close to the first surface 2511a does not limit the width of the scoring groove 252 close to the first surface 2511a among the two adjacent scoring grooves 252 to be gradual.
  • the width of the score groove 252 near the first surface 2511 a can also be referred to as the minimum width. That is to say, in the case where the width of the scoring groove 252 does not change along the thickness direction of the pressure relief portion 2511, “in the two adjacent scoring grooves 252 in the thickness direction of the pressure relief portion 2511, the distance away from the first The maximum width of the scoring groove 252 on the surface 2511a is smaller than the minimum width of the scoring groove 252 close to the first surface 2511a", which can be understood as "in the two adjacent scoring grooves 252 in the thickness direction of the pressure relief part 2511, away from The width of the scoring groove 252 on the first surface 2511a is smaller than the width of the scoring groove 252 close to the first surface 2511a".
  • the number of scoring grooves 252 sequentially provided on the pressure relief portion 2511 along its thickness direction may be two, three, four, and so on.
  • the multiple scoring grooves 252 on the pressure relief part 2511 can be formed in various ways, such as stamping, milling and so on. Taking forming a plurality of scoring grooves 252 by stamping as an example, a plurality of scoring grooves 252 can be punched and formed on the pressure relief portion 2511 in sequence along the direction from the first surface 2511 a to the second surface 2511 b.
  • three scoring grooves 252 are sequentially arranged on the pressure relief part 2511 along its thickness direction, and the first scoring groove 252 can be stamped and formed on the first surface 2511a first, and then the bottom surface of the first scoring groove 252 The second scoring groove 252 is punched and formed on the top, and the third scoring groove 252 is stamped and formed on the bottom surface of the second scoring groove 252 .
  • the first surface 2511a and the second surface 2511b of the pressure relief portion 2511 are two opposite surfaces of the pressure relief portion 2511 in its thickness direction, and the distance between the first surface 2511a and the second surface 2511b is the distance between the pressure relief portion 2511 thickness.
  • the pressure relief body 251 may be a component installed on the end cover 23 , for example, the pressure relief body 251 is a burst disk installed on the end cover 23 .
  • the pressure relief body 251 may also be the casing 21 for accommodating the electrode assembly 22 .
  • a part of the pressure relief body 251 may be the pressure relief portion 2511 , or the entirety of the pressure relief body 251 may be the pressure relief portion 2511 .
  • the pressure relief body 251 is an explosion-proof plate installed on the end cover 23, and the pressure relief body 251 may be a pressure relief part 2511 as a whole;
  • the pressure portion 2511 can be a wall or a part of a wall of the casing 21 .
  • the pressure relief device 25 since the pressure relief part 2511 is provided with a plurality of scoring grooves 252, the plurality of scoring grooves 252 are sequentially arranged on the pressure relief part 2511 along the direction from the first surface 2511a to the second surface 2511b. part 2511, and among the two score grooves 252 adjacent in the thickness direction of the pressure relief part 2511, the maximum width of the score groove 252 away from the first surface 2511a is smaller than the minimum width of the score groove 252 close to the first surface 2511a width, the pressure relief device 25 of this structure adopts a multi-stage notch groove 252 structure, which can reduce the forming force on the pressure relief part 2511 when forming each stage of notch groove 252, and reduce the risk of cracks in the pressure relief part 2511.
  • the pressure relief device 25 is less likely to fail due to cracks in the pressure relief portion 2511 at the position where the notch groove 252 is provided, which improves the long-term reliability of the pressure relief device 25 .
  • the scoring grooves 252 can be formed on the pressure relief part 2511 pole by pole from the direction from the first surface 2511a to the second surface 2511b.
  • the relatively shallow depth makes the pressure relief portion 2511 subjected to less forming force, which can reduce the risk of cracks in the pressure relief portion 2511 and improve the flatness of the first surface 2511a.
  • the pressure relief part 2511 can form a larger crack after breaking at the position of the scoring groove 252, which has the advantages of Very good pressure relief effect.
  • the plurality of scoring grooves 252 include a first scoring groove 2521 and a second scoring groove 2522 extending in the same direction, and the first scoring groove 2521 is arranged on the second scoring groove. 2522 underside.
  • the plurality of scoring grooves 252 includes a first scoring groove 2521 and a second scoring groove 2522, that is to say, among the plurality of scoring grooves 252, one scoring groove 252 is the first scoring groove 2521, and the other scoring groove 252 is the first scoring groove 2521.
  • One scoring groove 252 is a second scoring groove 2522 .
  • there may be only two scoring grooves 252 among the plurality of scoring grooves 252 and the two scoring grooves 252 are respectively the first scoring groove 2521 and the second scoring groove 2522 .
  • the extending directions of the first scoring groove 2521 and the second scoring groove 2522 are consistent, that is, the length direction of the first scoring groove 2521 is consistent with the length direction of the second scoring groove 2522 .
  • the bottom surface of the second scoring groove 2522 refers to the surface closest to the second surface 2511b among the groove wall surfaces of the second scoring groove 2522 , that is, the surface connected to the groove side of the second scoring groove 2522 .
  • the first scoring groove 2521 is disposed on the bottom surface of the second scoring groove 2522. It can be understood that, in the thickness direction of the pressure relief portion 2511, the first scoring groove 2521 is closer to the second surface than the second scoring groove 2522.
  • the first scoring groove 2521 is recessed from the bottom surface of the second scoring groove 2522 in a direction close to the second surface 2511b.
  • One first scoring groove 2521 may be provided on the bottom surface of the second scoring groove 2522 , and multiple first scoring grooves 2521 may also be provided.
  • one first notch groove 2521 is provided on the bottom surface of the second notch groove 2522 , that is, one second notch groove 2522 is correspondingly provided with one first notch groove 2521 .
  • the first scoring groove 2521 may be disposed at a middle position of the bottom surface of the second scoring groove 2522 in the width direction of the second scoring groove 2522 .
  • the second scoring groove 2522 is arranged on the first surface 2511a, that is, the second scoring groove 2522 It is recessed from the first surface 2511a toward the direction close to the second surface 2511b.
  • the distance between the two opposite groove sides of the second scoring groove 2522 in its width direction gradually increases and decreases from the first surface 2511a to the second surface 2511b, that is, the width of the second scoring groove 2522 is along the first surface 2511a
  • the direction to the second surface 2511b gradually decreases.
  • the two groove sides opposite to each other in the width direction of the second scoring groove 2522 may be inclined surfaces.
  • the distance between the two opposite groove sides of the first scoring groove 2521 in its width direction gradually decreases from the first surface 2511a to the direction of the second surface 2511b, that is, the width of the first scoring groove 2521 is along the direction of the first surface.
  • the direction from 2511a to the second surface 2511b gradually decreases.
  • the two opposite groove sides of the first scoring groove 2521 in its width direction may also be inclined surfaces.
  • the first scoring groove 2521 is arranged on the bottom surface of the second scoring groove 2522.
  • this structure It is convenient to form the first scoring groove 2521 and ensure the length of the first scoring groove 2521 .
  • it can ensure that the maximum width of the first scoring groove 2521 is smaller than the minimum width of the second scoring groove 2522 .
  • FIG. 6 is a partial view of the pressure relief device 25 provided in some other embodiments of the present application
  • FIG. 7 is a cross-sectional view of the pressure relief part 2511 shown in FIG. 6.
  • the first scoring groove 252 further includes a third scoring groove 2523 , the third scoring groove 2523 is disposed on the first surface 2511 a , and the second scoring groove 2522 is disposed on the bottom surface of the third scoring groove 2523 .
  • the plurality of scoring grooves 252 also includes a third scoring groove 2523. It can be understood that the plurality of scoring grooves 252 may only include the first scoring groove 2521, the second scoring groove 2522 and the third scoring groove 2523. , it may also include other scoring grooves 252 besides the first scoring groove 2521, the second scoring groove 2522 and the third scoring groove 2523, for example, the bottom surface of the first scoring groove 2521 is continuously set Score groove 252 .
  • the third scoring groove 2523 is disposed on the first surface 2511a, that is, the second scoring groove 2522 is recessed from the first surface 2511a toward the second surface 2511b.
  • the third scoring groove 2523 is the scoring groove 252 closest to the first surface 2511a.
  • the bottom surface of the third scoring groove 2523 refers to the surface closest to the second surface 2511b among the groove wall surfaces of the third scoring groove 2523 , that is, the surface connected to the groove side of the third scoring groove 2523 .
  • the second scoring groove 2522 is disposed on the bottom surface of the third scoring groove 2523. It can be understood that, in the thickness direction of the pressure relief portion 2511, the second scoring groove 2522 is closer to the second surface than the third scoring groove 2523.
  • the second scoring groove 2522 is recessed from the bottom surface of the third scoring groove 2523 in a direction close to the second surface 2511b.
  • the bottom surface of the third scoring groove 2523 may be provided with one second scoring groove 2522 , or even a plurality of second scoring grooves 2522 .
  • the plurality of scoring grooves 252 further include a third scoring groove 2523 disposed on the first surface 2511a, and the second scoring groove 2522 is disposed on the bottom surface of the third scoring groove 2523, that is, pressure relief
  • the portion 2511 is provided with three-level scoring grooves 252 to ensure that the pressure relief portion 2511 will not be subjected to excessive forming force when forming each level of scoring grooves 252, thereby reducing the risk of cracks in the pressure relief portion 2511.
  • the bottom surface of the third scoring groove 2523 is provided with a plurality of second scoring grooves 2522 .
  • the shape of the third scoring groove 2523 can be various, for example, the third scoring groove 2523 is a circular groove, a rectangular groove and the like. Exemplarily, in FIG. 6 , the third scoring groove 2523 is a rectangular groove.
  • the plurality of second scoring grooves 2522 arranged on the bottom surface of the third scoring groove 2523 can be arranged in various ways, for example, a plurality of second scoring grooves 2522 are arranged in parallel, and for another example, as shown in Figure 6, multiple The second scoring groove 2522 constitutes an approximately "H"-shaped structure.
  • the pressure relief part 2511 can be ruptured at the position of each second notch groove 2522 to realize pressure relief, which has a better performance. Good pressure relief effect improves the pressure relief rate.
  • one third scoring groove 2523 corresponds to a plurality of second scoring grooves 2522, the molding process can be simplified and the molding cost can be reduced.
  • FIG. 8 is a positional relationship diagram of the first notch groove 2521 , the second notch groove 2522 and the third notch groove 2523 shown in FIG. 6 , a plurality of second notch grooves
  • the groove 2522 includes a first groove segment 2522a, a second groove segment 2522b and a third groove segment 2522c, the first groove segment 2522a and the second groove segment 2522b are arranged at intervals, and the first groove segment 2522a and the second groove segment 2522b are connected to the third groove segment 2522b. Slot segments 2522c intersect.
  • the pressure relief part 2511 includes an opening area 2511c defined by the first groove segment 2522a, the second groove segment 2522b and the third groove segment 2522c, and the opening area 2511c is configured as the first groove segment 2522a, the second groove segment 2522b and the third groove segment 2522c.
  • the three-slot segment 2522c is open for the border.
  • the plurality of second scoring grooves 2522 includes a first groove segment 2522a, a second groove segment 2522b and a third groove segment 2522c, that is, among the plurality of second scoring grooves 2522, one second scoring groove 2522 is The first groove segment 2522a, another second scoring groove 2522 is a second groove segment 2522b, and another second scoring groove 2522 is a third groove segment 2522c.
  • the opening area 2511c is an area defined by the first slot section 2522a , the second slot section 2522b and the third slot section 2522c of the pressure relief portion 2511 .
  • the opening area 2511c defined by the first groove segment 2522a, the second groove segment 2522b and the third groove segment 2522c may be one or two.
  • the first groove section 2522a, the second groove section 2522b and the third groove section 2522c form an approximately " ⁇ "-shaped structure, and there is one opening area 2511c;
  • the three groove segments 2522c form an approximately "H"-shaped structure, and there are two opening regions 2511c.
  • the opening area 2511c is the area where the pressure relief part 2511 releases pressure.
  • the part of the pressure relief part 2511 in the opening area 2511c will form a first groove section 2522a, second slot segment 2522b, and third slot segment 2522c are bordered open for pressure relief.
  • the first groove section 2522a, the second groove section 2522b and the third groove section 2522c are all arranged on the bottom surface of the third scoring groove 2523,
  • the opening area 2511c is located in the range of the third scoring groove 2523, and the third scoring groove 2523 can be the part of the pressure relief part 2511 located in the opening area 2511c, with the first groove segment 2522a, the second groove segment 2522b and the third groove Segment 2522c provides clearance during border opening.
  • both the second groove segment 2522b and the second groove segment 2522b intersect the third groove segment 2522c, the first groove segment 2522a, the second groove segment Segment 2522b and third groove segment 2522c together define an opening area 2511c, this structure makes the pressure relief part 2511 rupture after the first groove segment 2522a, the second groove segment 2522b and the second groove segment 2522b, the pressure relief part 2511 The part located in the opening area 2511c will be opened for pressure relief, which increases the pressure relief area of the pressure relief portion 2511 and improves the pressure relief rate of the pressure relief portion 2511 .
  • the plurality of second scoring grooves 2522 further include a fourth groove segment 2522d, and in the extending direction of the third groove segment 2522c, the fourth groove segment 2522d is located at the first groove segment 2522a Between the second slot segment 2522b, the fourth slot segment 2522d intersects the third slot segment 2522c.
  • the plurality of second scoring grooves 2522 includes a fourth groove segment 2522d. Understandably, the plurality of second scoring grooves 2522 may only include the first groove segment 2522a, the second groove segment 2522b, the third groove segment 2522c and The fourth slot segment 2522d may also include other slot segments in addition to the first slot segment 2522a, the second slot segment 2522b, the third slot segment 2522c and the fourth slot segment 2522d. Exemplarily, the fourth slot segment 2522d may be parallel to the first slot segment 2522a and the second slot segment 2522b, and perpendicular to the third slot segment 2522c.
  • the fourth groove section 2522d located between the first groove section 2522a and the second groove section 2522b intersects with the third groove section 2522c
  • the pressure relief part 2511 is located between the third groove section 2522c and the fourth groove section 2522d.
  • the stress at the intersection position is more concentrated, and it is easier to break, so that the pressure relief part 2511 breaks along the third groove segment 2522c from the position where the third groove segment 2522c and the fourth groove segment 2522d intersect during the pressure relief process, and breaks in the third groove segment 2522c. After the segment 2522c breaks, it ruptures along the first groove segment 2522a and the second groove segment 2522b, so as to realize rapid pressure relief.
  • the depth of the first groove segment 2522a is equal to the depth of the second groove segment 2522b
  • the depth of the third groove segment 2522c is equal to the depth of the fourth groove segment 2522d
  • the depth of the first groove segment 2522a is smaller than that of the third groove segment
  • the depth of 2522c makes it easier for the pressure relief portion 2511 to rupture along the third groove section 2522c from the intersection of the third groove section 2522c and the fourth groove section 2522d during the pressure relief process.
  • the depth of the first groove section 2522a, the depth of the second groove section 2522b and the depth of the third groove section 2522c are all smaller than the depth of the fourth groove section 2522d, which can also ensure that the pressure part is in the pressure relief process. It is easier to break along the third groove segment 2522c from the position where the third groove segment 2522c intersects the fourth groove segment 2522d.
  • the distance from the intersection of the fourth slot segment 2522d and the third slot segment 2522c to the first slot segment 2522a is equal to that between the fourth slot segment 2522d and the third slot segment 2522c The distance from the intersection location to the second slot segment 2522b.
  • the distance from the intersection of the fourth groove segment 2522d and the third groove segment 2522c to the first groove segment 2522a is the distance between the third groove segment 2522c and the first groove segment 2522d.
  • the distance from the intersection of the fourth groove segment 2522d and the third groove segment 2522c to the second groove segment 2522b is the distance between the third groove segment 2522c and the second groove segment 2522d.
  • the distance from the intersection of the fourth groove segment 2522d and the third groove segment 2522c to the first groove segment 2522a is equal to the distance from the intersection position of the fourth groove segment 2522d and the third groove segment 2522c to the second groove segment 2522b , so that the pressure relief part 2511 can break along the third groove segment 2522c at the intersection of the fourth groove segment 2522d and the third groove segment 2522c, and then simultaneously rupture along the first groove segment 2522a and the second groove segment 2522b.
  • the first groove segment 2522a, the second groove segment 2522b and the third groove segment 2522c define two opening regions 2511c, and the two opening regions 2511c are respectively located at the sides of the third groove segment 2522c. sides.
  • the first slot section 2522a, the second slot section 2522b and the third slot section 2522c jointly define two open areas 2511c, and the first slot section 2522a, the second slot section 2522b and the third slot section 2522c can form an approximate "H" shape structure.
  • the two opening areas 2511c are respectively located on both sides of the third groove section 2522c, so that the two opening areas 2511c are bounded by the third groove section 2522c. After the pressure relief part 2511 is broken at the position of the third groove section 2522c, the two opening areas 2511c It will open in half along the first slot section 2522a and the second slot section 2522b for pressure relief.
  • the first groove segment 2522a , the second groove segment 2522b and the third groove segment 2522c may define two opening regions 2511c.
  • the two opening areas 2511c are respectively located on both sides of the third slot section 2522c, and the pressure relief During the pressure relief process of the pressure relief portion 2511, the parts of the pressure relief portion 2511 in the two pressure relief areas can be opened in half for pressure relief, which can effectively increase the pressure relief rate of the pressure relief portion 2511.
  • the second surface 2511b is provided with a notch groove 253 at least partially located in the opening area 2511c, and in the extending direction of the first groove segment 2522a, the notch groove 253 Slot segment 2522c has a distance.
  • the second surface 2511b is provided with a notch groove 253 at least partially located in the opening area 2511c. It can be understood that the notch groove 253 is recessed from the second surface 2511b in a direction facing the first surface 2511a, and the notch groove 253 is at least partially located in the opening area 2511c. Certainly, the notch groove 253 may be completely located in the opening area 2511c, or the notch groove 253 may be partially located in the opening area 2511c.
  • the notch groove 253 can extend along the extension direction of the third groove segment 2522c, so that the notch groove 253 is parallel to the third groove segment 2522c.
  • the first surface 2511a may be provided with a corresponding notch groove 253 .
  • the first surface 2511a can be provided with two notch grooves 253 correspondingly , one open area 2511c is correspondingly provided with one notch groove 253 .
  • the notch groove 253 and the third groove segment 2522c there is a distance between the notch groove 253 and the third groove segment 2522c in the extending direction of the first groove segment 2522a, and at least part of the notch groove 253 is located in the opening area 2511c, so that the pressure relief part 2511 is in the pressure relief process.
  • the part of the pressure relief part 2511 located in the opening area 2511c can be turned around with the position of the pressure relief part 2511 located in the notch 253 as an axis, so that it is easier to open the pressure relief.
  • the distance between the first surface 2511a and the second surface 2511b is H0
  • the distance from the bottom surface of the scoring groove 252 closest to the second surface 2511b to the second surface 2511b is H1
  • H0 and H1 satisfy the relational expression: H1/H0 ⁇ 0.2.
  • the distance between the first surface 2511a and the second surface 2511b is the thickness of the pressure relief portion 2511 .
  • the distance from the bottom surface of the scoring groove 252 closest to the second surface 2511b to the second surface 2511b is the thickness of the portion between the bottom surface of the scoring groove 252 closest to the second surface 2511b and the second surface 2511b.
  • the first scoring groove 2521 is the groove closest to the second surface 2511b. Trace groove 252 .
  • the ratio of the distance from the bottom surface of the scoring groove 252 closest to the second surface 2511b to the second surface 2511b to the distance from the first surface 2511a to the second surface 2511b is less than 0.2, so that the closest to the second surface 2511b
  • the thickness of the part between the bottom surface of the scoring groove 252 and the second surface 2511b accounts for a relatively small proportion in the total thickness of the pressure relief part 2511, so that the bottom surface of the scoring groove 252 closest to the second surface 2511b and the second surface
  • the part between 2511b can rupture normally to achieve pressure relief.
  • the distance from the bottom surface of the scoring groove 252 closest to the second surface 2511b to the second surface 2511b is H1, and H1 satisfies the relationship H1 ⁇ 0.5mm.
  • the distance between the bottom surface of the scoring groove 252 closest to the second surface 2511b and the second surface 2511b is less than 0.5mm, so that the distance between the bottom surface of the scoring groove 252 closest to the second surface 2511b and the second surface 2511b The thickness of the part between them is small, which is easy to rupture and release pressure.
  • the depth of the scoring groove 252 disposed on the first surface 2511a is H2, and H2 satisfies the relationship H2 ⁇ 1 mm.
  • the depth of the scoring groove 252 disposed on the first surface 2511a is the distance from the bottom surface of the scoring groove 252 disposed on the first surface 2511a to the first surface 2511a.
  • the third scoring groove 2523 is a scoring provided on the first surface 2511a Slot 252.
  • the depth of the scoring groove 252 provided on the first surface 2511a is less than 1 mm, so that the depth of the scoring groove 252 on the outermost side of the pressure relief part 2511 is relatively small, reducing the pressure of the pressure relief part 2511 on the scoring groove.
  • the molding force 252 receives during the molding process reduces the risk of cracks in the pressure relief portion 2511 .
  • the depth of the scoring groove 252 between the scoring groove 252 closest to the second surface 2511b and the scoring groove 252 disposed on the first surface 2511a is H3, and H3 satisfies the relationship H3 ⁇ 1.5mm.
  • the plurality of scoring grooves 252 includes at least three scoring grooves 252 .
  • the scoring groove 252 closest to the second surface 2511b is the first scoring groove 2521
  • the notch groove 252 provided on the first surface 2511a is the third notch groove 2523
  • the groove 252 is the second scoring groove 2522 .
  • the depth of the notch groove 252 between the notch groove 252 closest to the second surface 2511b and the notch groove 252 disposed on the first surface 2511a is less than 1.5mm, so that the pressure relief part 2511 except the most
  • the score grooves 252 near the second surface 2511b and the score grooves 252 other than the score grooves 252 provided on the first surface 2511a have a smaller depth, which reduces the molding force on the pressure relief part 2511 during the molding process and reduces the pressure relief part. 2511 Risk of cracking.
  • FIG. 9 is a schematic structural diagram of a pressure relief device 25 provided in some other embodiments of the present application.
  • An accommodation space is formed inside the pressure relief body 251 .
  • a plurality of walls, the accommodating space is used for accommodating the electrode assembly 22 , and a pressure relief portion 2511 is formed on one of the plurality of walls.
  • One of the multiple walls is formed with a pressure relief portion 2511 , and a part of one wall may be the pressure relief portion 2511 , or the whole of one wall may be the pressure relief portion 2511 .
  • the first surface 2511a of the pressure relief part 2511 may be the outer surface of the wall, or the inner surface of the wall.
  • the outer surface of the wall is the surface of the wall facing away from the electrode assembly 22
  • the inner surface of the wall is the surface of the wall facing the electrode assembly 22 .
  • the pressure relief body 251 can be in various shapes, such as a cuboid, a cylinder, and the like.
  • a plurality of walls of the pressure relief body 251 define an accommodation chamber for accommodating the electrode assembly 22, and one of the walls is formed with a pressure relief portion 2511, so that the pressure relief device 25 has the function of accommodating the electrode assembly.
  • the accommodation function of 22 has pressure relief function again.
  • the multiple walls of the pressure relief body 251 include a peripheral wall 2512 and a bottom wall 2513 , the peripheral wall 2512 surrounds the edge of the bottom wall 2513 , and the peripheral wall 2512 and the bottom wall 2513 jointly define an accommodation space. , the bottom wall 2513 is formed with a pressure relief portion 2511 .
  • the peripheral wall 2512 surrounds the edge of the bottom wall 2513 , so that the pressure relief body 251 forms an opening at the opposite end of the bottom wall 2513 , and the end cap 23 is used to cover the opening.
  • the pressure relief body 251 may have two walls, one wall is the bottom wall 2513 and the other wall is the peripheral wall 2512 . As shown in FIG. 9 , in the embodiment where the pressure relief body 251 is a cuboid, the pressure relief body 251 may have five walls, a bottom wall 2513 and four side walls, and the four side walls are connected end to end to form a peripheral wall 2512 .
  • the peripheral wall 2512 and the bottom wall 2513 are integrally formed.
  • peripheral wall 2512 and the bottom wall 2513 are integrally formed, that is to say, the peripheral wall 2512 and the bottom wall 2513 are integrally formed together.
  • the peripheral wall 2512 and the bottom wall 2513 are integrally formed, so that the peripheral wall 2512 and the bottom wall 2513 with a pressure relief function have good firmness.
  • the formula design can simplify the molding process and reduce the production cost.
  • the first surface 2511a is the outer surface of the bottom wall 2513, that is to say, the plurality of scoring grooves 252 on the pressure relief portion 2511 are arranged sequentially from the outer surface of the bottom wall 2513 to the inner surface of the bottom wall 2513, It is convenient to process the scoring groove 252 on the pressure relief body 251 .
  • the embodiment of the present application provides a battery cell 20 including the pressure relief device 25 provided in any one of the above embodiments.
  • a battery 100 includes a box body 10 and a battery cell 20 provided in any one of the above embodiments, and the box body 10 is used to accommodate the battery cell 20 .
  • an electrical device includes the battery 100 provided in any one of the above embodiments.
  • the electric device may be any of the above-mentioned devices using the battery 100 .
  • the embodiment of the present application also provides a casing 21, the casing 21 includes a plurality of walls, and the plurality of walls jointly define the accommodation space for accommodating the electrode assembly 22, at least one of the walls is provided with A plurality of scoring grooves 252, the wall has opposite first surface 2511a and second surface 2511b in its thickness direction, and a plurality of scoring grooves 252 are sequentially arranged on the wall along the direction from the first surface 2511a to the second surface 2511b , among two adjacent scoring grooves 252 in the wall thickness direction, the maximum width of the scoring groove 252 away from the first surface 2511a is smaller than the minimum width of the scoring groove 252 close to the first surface 2511a.
  • the shell 21 of this structure integrates the pressure relief function and the containment function, and adopts a multi-stage scoring groove 252 structure, which can reduce the molding force on the shell 21 when forming each level of scoring groove 252, and reduce the pressure on the shell 21. The risk of cracks is eliminated, increasing the long-term reliability of the pressure relief device 25.
  • Fig. 10 is a flow chart of the manufacturing method of the pressure relief device 25 provided by some embodiments of the present application, the method includes:
  • S100 Provide a pressure relief body 251, the pressure relief body 251 includes a pressure relief portion 2511, and the pressure relief portion 2511 has opposite first surfaces 2511a and second surfaces 2511b in its thickness direction;
  • S200 sequentially process a plurality of scoring grooves 252 on the pressure relief part 2511 along the direction from the first surface 2511a to the second surface 2511b;
  • the maximum width of the scoring groove 252 on the surface 2511a is smaller than the minimum width of the scoring groove 252 near the first surface 2511a.
  • sequentially processing a plurality of scoring grooves 252 on the pressure relief portion 2511 along the direction from the first surface 2511a to the second surface 2511b includes: on the pressure relief portion 2511 along the first surface 2511a to the second surface A plurality of scoring grooves 252 are sequentially punched in the direction of 2511b.
  • a plurality of scoring grooves 252 are sequentially formed on the pressure relief portion 2511 in the direction from the first surface 2511a to the second surface 2511b by stamping, the forming process is simple, and the pressure relief portion 2511 can be reduced when stamping each level of scoring groove 252 The received pressing force reduces the risk of cracks in the pressure relief portion 2511 .
  • FIG. 11 is a schematic block diagram of the manufacturing equipment 2000 of the pressure relief device 25 provided by some embodiments of the present application.
  • a first providing device 2100 and a processing device 2200 The first providing device 2100 is used for providing a pressure relief body 251, the pressure relief body 251 includes a pressure relief portion 2511, and the pressure relief portion 2511 has a first surface 2511a and a second surface 2511b opposite to each other along its thickness direction.
  • the processing device 2200 is used to sequentially process a plurality of scoring grooves 252 on the pressure relief portion 2511 along the direction from the first surface 2511a to the second surface 2511b. Among the two adjacent scoring grooves 252 in the thickness direction, the maximum width of the scoring groove 252 away from the first surface 2511a is smaller than the minimum width of the scoring groove 252 close to the first surface 2511a.

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Abstract

本申请实施例提供了一种泄压装置、电池单体、电池及用电设备，属于电池技术领域。其中泄压装置包括泄压本体和多个刻痕槽。泄压本体包括泄压部，泄压部在其厚度方向上具有相对的第一表面和第二表面。多个刻痕槽沿第一表面到第二表面的方向依次布置于泄压部，在厚度方向上相邻的两个刻痕槽中，远离第一表面的刻痕槽的最大宽度小于靠近第一表面的刻痕槽的最小宽度。这种结构的泄压装置采用多级刻痕槽结构，可以降低在成型每级刻痕槽时泄压部所受到的成型力，降低泄压部产生裂纹的风险，泄压装置不易因泄压部在设置刻痕槽的位置产生裂纹而失效，提高泄压装置的长期可靠性。

Description

泄压装置、电池单体、电池及用电设备 技术领域
本申请涉及电池技术领域，具体而言，涉及一种泄压装置、电池单体、电池及用电设备。
背景技术
电池广泛用于电子设备，例如手机、笔记本电脑、电瓶车、电动汽车、电动飞机、电动轮船、电动玩具汽车、电动玩具轮船、电动玩具飞机和电动工具等等。
在电池技术中，为保证电池单体的安全性，一般会在电池单体中设置泄压装置，在电池单体内部或温度达到阈值时，泄压装置在设置刻痕槽的位置破裂，以泄放电池单体内部的压力。对于一般的泄压装置而言，在电池单体的内部压力处于正常范围内时也可能会出现泄压的情况，长期可靠性较差。
发明内容
本申请实施例提供一种泄压装置、电池单体、电池及用电设备，能够有效提高泄压装置的长期可靠性。
第一方面，本申请实施例提供一种泄压装置，包括：泄压本体，包括泄压部，所述泄压部在其厚度方向上具有相对的第一表面和第二表面；多个刻痕槽，沿所述第一表面到所述第二表面的方向依次布置于所述泄压部，在所述厚度方向上相邻的两个刻痕槽中，远离所述第一表面的刻痕槽的最大宽度小于靠近所述第一表面的刻痕槽的最小宽度。
上述技术方案中，泄压部上设置有多个刻痕槽，多个刻痕槽沿泄压部的第一表面到第二表面的方向依次布置于泄压部，且在泄压部的厚度方向上相邻的两个刻痕槽中，远离第一表面的刻痕槽的最大宽度小于靠近第一表面的刻痕槽的最小宽度，这种结构的泄压装置采用多级刻痕槽结构，可以降低在成型每级刻痕槽时泄压部所受到的成型力，降低泄压部产生裂纹的风险，泄压装置不易因泄压部在设置刻痕槽的位置产生裂纹而失效，提高泄压装置的长期可靠性。
在一些实施例中，所述多个刻痕槽包括延伸方向一致的第一刻痕槽和第二刻痕槽，所述第一刻痕槽设置于所述第二刻痕槽的底面。
上述技术方案中，第一刻痕槽的延伸方向与第二刻痕槽的延伸方向一致，第一刻痕槽设置于第二刻痕槽的底面，这种结构一方面便于第一刻痕槽成型，保证第一刻痕槽的长度，另一方面可以保证第一刻痕槽的最大宽度小于第二刻痕槽的最小宽度。
在一些实施例中，所述多个刻痕槽还包括第三刻痕槽，所述第三刻痕槽设置于所述第一表面，所述第二刻痕槽设置于所述第三刻痕槽的底面。
上述技术方案中，多个刻痕槽还包括设置于第一表面的第三刻痕槽，第二刻痕槽设置于第三刻痕槽的底面，也就是说，泄压部上设置有三级刻痕槽，保证在成型每级刻痕槽时泄压部所受到的成型力不会过大，降低泄压部产生裂纹的风险。
在一些实施例中，所述第三刻痕槽的底面设置有多个第二刻痕槽。
上述技术方案中，第三刻痕槽的底面上设有多个第二刻痕槽，使得泄压部能够在各个第二刻痕槽的位置破裂实现泄压，具有更好的泄压效果，提高了泄压速率。此外，由于一个第三刻痕槽对应多个第二刻痕槽，可简化成型工艺，降低成型成本。
在一些实施例中，所述多个第二刻痕槽包括第一槽段、第二槽段和第三槽段，所述第一槽段和所述第二槽段间隔设置，所述第一槽段和所述第二槽段均与所述第三槽段相交；所述泄压部包括由所述第一槽段、第二槽段和第三槽段共同界定出开启区，所述开启区被配置为以第一槽段、第二槽段和第三槽段为边界打开。
上述技术方案中，第一槽段与第二槽段间隔设置，第二槽段和第二槽段均与第三槽段相交，第一槽段、第二槽段和第三槽段共同界定出开启区，泄压部在第一槽段、第二槽段与第二槽段的位置破裂后，泄压部位于开启区的部分将打开泄压，增大了泄压部的泄压面积，提高了泄压部的泄压速率。
在一些实施例中，所述多个第二刻痕槽还包括第四槽段，在所述第三槽段的延伸方向上，所述第四槽段位于所述第一槽段与所述第二槽段之间，所述第四槽段与所述第三槽段相交。
上述技术方案中，位于第一槽段与第二槽段之间的第四槽段与第三槽段相交，泄压部在第三槽段与第四槽段相交位置应力更为集中，更容易破裂，使得泄压部在泄压过程中从第三槽段与第四槽段相交的位置沿着第三槽段破裂，并在第三槽段破裂后沿着第一槽段和第二槽段破裂，以实现快速泄压。
在一些实施例中，在所述第三槽段的延伸方向上，所述第四槽段与所述第三槽段相交位置到第一槽段的距离等于所述第四槽段与所述第三槽段相交位置到第二槽段的距离。
上述技术方案中，第四槽段与第三槽段相交位置到第一槽段的距离等于第四槽段与第三槽段相交位置到第二槽段的距离，使得泄压部能够在第四槽段与第三槽段相交的位置沿着第三槽段破裂后，沿着第一槽段和第二槽段同步破裂。
在一些实施例中，所述第一槽段、所述第二槽段和所述第三槽段界定出两个开启区，两个开启区分别位于所述第三槽段的两侧。
上述技术方案中，第一槽段、第二槽段和第三槽段界定出两个开启区，两个开启区分别位于第三槽段的两侧，泄压部在泄压过程中，泄压部在两个泄压区的部分能够以对开的方式打开泄压，可有效提高泄压部的泄压速率。
在一些实施例中，所述第二表面上设有位于所述开启区的缺口槽，在第一槽段的延伸方向上，所述缺口槽与所述第三槽段存在距离。
上述技术方案中，缺口槽在第一槽段的延伸方向上与第三槽段存在距离，且缺口槽的至少部分位于开启区内，使得泄压部在泄压过程，泄压部位于开启区的一部分能够以泄压部位于缺口槽的位置为轴翻转，更加容易打开泄压。
在一些实施例中，所述第一表面与所述第二表面的距离为H0，最靠近所述第二表面的刻痕槽的底面到所述第二表面的距离为H1，H0与H1满足关系式：H1/H0<0.2。
上述技术方案中，最靠近第二表面的刻痕槽的底面到第二表面的距离与第一表面到第二表面的距离的比值小于0.2，使得最靠近第二表面的刻痕槽的底面与第二表面之间的部分的厚度在泄压部的总厚度中的占比较小，使得最靠近第二表面的刻痕槽的底面与第二表面之间的部分能够正常破裂，以实现泄压。
在一些实施例中，最靠近所述第二表面的刻痕槽的底面到所述第二表面的距离为H1，H1满足关系式H1<0.5mm。
上述技术方案中，最靠近所述第二表面的刻痕槽的底面到所述第二表面的距离小于0.5mm，使得最靠近第二表面的刻痕槽的底面与第二表面之间的部分的厚度较小，易于破裂泄压。
在一些实施例中，设置于所述第一表面的刻痕槽的深度为H2，H2满足关系式H2<1mm。
上述技术方案中，设置于所述第一表面的刻痕槽的深度小于1mm，使得泄压部最外侧的刻痕槽的深度较小，降低了泄压部在该刻痕槽在成型过程所受到的成型力，降低泄压部产生裂纹的风险。
在一些实施例中，最靠近所述第二表面的刻痕槽与设置于所述第一表面的刻痕槽之间的刻痕槽的深度为H3，H3满足关系式H3<1.5mm。
上述技术方案中，最靠近第二表面的刻痕槽与设置于第一表面的刻痕槽之间的刻痕槽的深 度小于1.5mm，使得泄压部上除了最靠近第二表面的刻痕槽和设置于第一表面的刻痕槽以外的刻痕槽的深度较小，降低成型过程泄压部所受到的成型力，降低泄压部产生裂纹的风险。
在一些实施例中，所述泄压本体内部形成有容纳空间，所述泄压本体具有界定出所述容纳空间的多个壁，所述容纳空间用于收容电极组件，所述多个壁中的一个壁形成有所述泄压部。
上述技术方案中，泄压本体的多个壁限定出用于收容电极组件的容纳腔，多个壁中的一个壁形成有泄压部，使得泄压装置既具有容纳电极组件的容纳功能，又具有泄压功能。
在一些实施例中，所述多个壁包括周壁和底壁，所述周壁围设于所述底壁的边缘，所述周壁与所述底壁共同限定出所述容纳空间，所述底壁形成有所述泄压部。
上述技术方案中，泄压本体的底壁形成有泄压部，使得底壁具有很好的泄压功能。
在一些实施例中，所述周壁与所述底壁为一体成型结构。
上述技术方案中，由于底壁形成有泄压部，周壁与底壁为一体成型结构，使得周壁与具有泄压功能的底壁具有很好的牢固性，这种一体式设计能够简化成型工艺，降低生产成本。
在一些实施例中，所述第一表面为所述底壁的外表面。
上述技术方案中，第一表面为所述底壁的外表面，便于在泄压本体上加工刻痕槽。
第二方面，本申请实施例提供一种电池单体，包括第一方面任意一个实施例提供的泄压装置。
第三方面，一种电池，包括：第二方面任意一个实施例提供的电池单体；以及箱体，用于容纳所述电池单体。
第四方面，一种用电设备，包括第三方面任意一个实施例提供的电池。
第五方面，本申请实施例提供一种泄压装置的制造方法，所述方法包括：提供泄压本体，所述泄压本体包括泄压部，所述泄压部在其厚度方向上具有相对的第一表面和第二表面；在所述泄压部上沿所述第一表面到所述第二表面的方向依次加工出多个刻痕槽；在所述厚度方向上相邻的两个刻痕槽中，远离所述第一表面的刻痕槽的最大宽度小于靠近所述第一表面的刻痕槽的最小宽度。
在一些实施例中，所述在所述泄压部上沿所述第一表面到所述第二表面的方向依次加工出多个刻痕槽包括：在所述泄压部上沿所述第一表面到所述第二表面的方向依次冲压出多个刻痕槽。
上述技术方案中，通过冲压的方式在泄压部上从第一表面到第二表面的方向上依次成型多个刻痕槽，成型工艺简单，能够降低冲压每级刻痕槽时泄压部所受到的冲压力，降低泄压部产生裂纹的风险。
第六方面，本申请实施例提供一种泄压装置的制造设备，包括：第一提供装置，用于提供泄压本体，所述泄压本体包括泄压部，所述泄压部在其厚度方向上具有相对的第一表面和第二表面；以及加工装置，用于在所述泄压部上沿所述第一表面到所述第二表面的方向依次加工出多个刻痕槽；其中，在所述厚度方向上相邻的两个刻痕槽中，远离所述第一表面的刻痕槽的最大宽度小于靠近所述第一表面的刻痕槽的最小宽度。
附图说明
为了更清楚地说明本申请实施例的技术方案，下面将对实施例中所需要使用的附图作简单地介绍，应当理解，以下附图仅示出了本申请的某些实施例，因此不应被看作是对范围的限定，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他相关的附图。
图1为本申请一些实施例提供的车辆的结构示意图；
图2为本申请一些实施例提供的电池的结构示意图；
图3为本申请一些实施例提供的电池单体的爆炸图；
图4为本申请一些实施例提供的泄压装置的结构示意图；
图5为图4所示的泄压部的截面图；
图6为本申请又一些实施例提供的泄压装置的局部视图；
图7为图6所示的泄压部的截面图；
图8为图6所示的第一刻痕槽、第二刻痕槽和第三刻痕槽的位置关系图；
图9为本申请又一些实施例提供的泄压装置的结构示意图；
图10为本申请一些实施例提供的泄压装置的制造方法的流程图；
图11为本申请一些实施例提供的泄压装置的制造设备的示意性框图。
图标：10-箱体；11-第一部分；12-第二部分；20-电池单体；21-壳体；22-电极组件；221-正极极耳；222-负极极耳；23-端盖；231-正极电极端子；232-负极电极端子；24-绝缘件；25-泄压装置；251-泄压本体；2511-泄压部；2511a-第一表面；2511b-第二表面；2511c-开启区；2512-周壁；2513-底壁；252-刻痕槽；2521-第一刻痕槽；2522-第二刻痕槽；2522a-第一槽段；2522b-第二槽段；2522c-第三槽段；2522d-第四槽段；2523-第三刻痕槽；253-缺口槽；26-集流构件；100-电池；200-控制器；300-马达；1000-车辆；2000-制造设备；2100-提供装置；2200-加工装置。
具体实施方式
为使本申请实施例的目的、技术方案和优点更加清楚，下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚地描述，显然，所描述的实施例是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
除非另有定义，本申请所使用的所有的技术和科学术语与属于本申请的技术领域的技术人员通常理解的含义相同；本申请中在申请的说明书中所使用的术语只是为了描述具体的实施例的目的，不是旨在于限制本申请；本申请的说明书和权利要求书及上述附图说明中的术语“包括”和“具有”以及它们的任何变形，意图在于覆盖不排他的包含。本申请的说明书和权利要求书或上述附图中的术语“第一”、“第二”等是用于区别不同对象，而不是用于描述特定顺序或主次关系。
在本申请中提及“实施例”意味着，结合实施例描述的特定特征、结构或特性可以包含在本申请的至少一个实施例中。在说明书中的各个位置出现该短语并不一定均是指相同的实施例，也不是与其它实施例互斥的独立的或备选的实施例。
在本申请的描述中，需要说明的是，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”、“附接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本申请中的具体含义。
本申请中术语“和/或”，仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。另外，本申请中字符“/”，一般表示前后关联对象是一种“或”的关系。
在本申请的实施例中，相同的附图标记表示相同的部件，并且为了简洁，在不同实施例中，省略对相同部件的详细说明。应理解，附图示出的本申请实施例中的各种部件的厚度、长宽等尺寸，以及集成装置的整体厚度、长宽等尺寸仅为示例性说明，而不应对本申请构成任何限定。
本申请中出现的“多个”指的是两个以上(包括两个)。
本申请中，电池单体可以包括锂离子二次电池、锂离子一次电池、锂硫电池、钠锂离子电池、钠离子电池或镁离子电池等，本申请实施例对此并不限定。电池单体可呈圆柱体、扁平体、长方体或其它形状等，本申请实施例对此也不限定。电池单体一般按封装的方式分成三种：柱形电池单体、方形电池单体和软包电池单体，本申请实施例对此也不限定。
本申请的实施例所提到的电池是指包括一个或多个电池单体以提供更高的电压和容量的单一的物理模块。例如，本申请中所提到的电池可以包括电池模块或电池包等。电池一般包括用于封装一个或多个电池单体的箱体。箱体可以避免液体或其他异物影响电池单体的充电或放电。
电池单体包括电极组件和电解液，电极组件由正极极片、负极极片和隔离膜组成。电池单体主要依靠金属离子在正极极片和负极极片之间移动来工作。正极极片包括正极集流体和正极活性物质层，正极活性物质层涂覆于正极集流体的表面，未涂敷正极活性物质层的正极集流体凸出于已涂覆正极活性物质层的正极集流体，未涂敷正极活性物质层的正极集流体作为正极极耳。以锂离子电池为例，正极集流体的材料可以为铝，正极活性物质可以为钴酸锂、磷酸铁锂、三元锂或锰酸锂等。负极极片包括负极集流体和负极活性物质层，负极活性物质层涂覆于负极集流体的表面，未涂敷负极活性物质层的负极集流体凸出于已涂覆负极活性物质层的负极集流体，未涂敷负极活性物质层的负极集流体作为负极极耳。负极集流体的材料可以为铜，负极活性物质可以为碳或硅等。为了保证通过大电流而不发生熔断，正极极耳的数量为多个且层叠在一起，负极极耳的数量为多个且层叠在一起。隔离膜的材质可以为PP(polypropylene，聚丙烯)或PE(polyethylene，聚乙烯)等。此外，电极组件可以是卷绕式结构，也可以是叠片式结构，本申请实施例并不限于此。
电池技术的发展要同时考虑多方面的设计因素，例如，能量密度、循环寿命、放电容量、充放电倍率等性能参数，另外，还需要考虑电池的安全性。
电池单体上的泄压装置对电池的安全性有着重要影响。例如，当发生短路、过充等现象时，可能会导致电池单体内部发生热失控从而压力或温度骤升。这种情况下通过泄压机构致动可以将内部压力及温度向外释放，以防止电池单体爆炸、起火。
发明人发现，在一般的电池单体中，泄压装置在电池单体的内部压力处于正常范围内也会出现泄压的情况，导致电池单体失效。发明人进一步研究发现，泄压装置一般是在泄压本体设置刻痕槽，为保证泄压装置在电池单体内部压力或温度达到阈值时能够正常泄压，需要将刻痕槽加工较深，泄压本体上的刻痕槽成型后，容易产生裂纹，出现电池单体的内部有压力处于正常范围(未达到阈值)内泄压装置泄压的情况。
鉴于此，本申请实施例提供一种泄压装置，在泄压本体的泄压部上从第一表面到第二表面的方向依次布置多个刻痕槽，且在泄压部的厚度方向上相邻的两个刻痕槽中，远离所述第一表面的刻痕槽的最大宽度小于靠近所述第一表面的刻痕槽的最小宽度。
在这样的泄压装置中，采用多级刻痕槽结构，可以降低在成型每级刻痕槽时泄压部所受到的成型力，降低泄压部产生裂纹的风险，泄压装置不易因泄压部在设置刻痕槽的位置产生裂纹而失效，提高泄压装置的长期可靠性。
本申请实施例描述的技术方案适用于电池以及使用电池的用电设备。
用电设备可以是车辆、手机、便携式设备、笔记本电脑、轮船、航天器、电动玩具和电动工具等等。车辆可以是燃油汽车、燃气汽车或新能源汽车，新能源汽车可以是纯电动汽车、混合动力汽车或增程式汽车等；航天器包括飞机、火箭、航天飞机和宇宙飞船等等；电动玩具包括固定式或移动式的电动玩具，例如，游戏机、电动汽车玩具、电动轮船玩具和电动飞机玩具等等；电动工具包括金属切削电动工具、研磨电动工具、装配电动工具和铁道用电动工具，例如，电钻、电动砂轮机、电动扳手、电动螺丝刀、电锤、冲击电钻、混凝土振动器和电刨等等。本申请实施例对上述用电设备不做特殊限制。
以下实施例为了方便说明，以用电设备为车辆为例进行说明。
请参照图1，图1为本申请一些实施例提供的车辆1000的结构示意图；车辆1000的内部设置有电池100，电池100可以设置在车辆1000的底部或头部或尾部。电池100可以用于车辆1000的供电，例如，电池100可以作为车辆1000的操作电源。
车辆1000还可以包括控制器200和马达300，控制器200用来控制电池100为马达300供电，例如，用于车辆1000的启动、导航和行驶时的工作用电需求。
在本申请一些实施例中，电池100不仅仅可以作为车辆1000的操作电源，还可以作为车 辆1000的驱动电源，代替或部分地代替燃油或天然气为车辆1000提供驱动动力。
请参照图2，图2为本申请一些实施例提供的电池100的结构示意图，电池100包括箱体10和电池单体20，箱体10用于容纳电池单体20。
其中，箱体10是容纳电池单体20的部件，箱体10为电池单体20提供收容空间，箱体10可以是多种结构。在一些实施例中，箱体10可以包括第一部分11和第二部分12，第一部分11与第二部分12相互盖合，以限定出用于容纳电池单体20的收容空间。第一部分11和第二部分12可以是多种形状，比如，长方体、圆柱体等。第一部分11可以是一侧开放的空心结构，第二部分12也可以是一侧开放的空心结构，第二部分12的开放侧盖合于第一部分11的开放侧，则形成具有收容空间的箱体10。也可以是第一部分11为一侧开放的空心结构，第二部分12为板状结构，第二部分12盖合于第一部分11的开放侧，则形成具有收容空间的箱体10。第一部分11与第二部分12可以通过密封元件来实现密封，密封元件可以是密封圈、密封胶等。
在电池100中，电池单体20可以是一个、也可以是多个。若电池单体20为多个，多个电池单体20之间可串联或并联或混联，混联是指多个电池单体20中既有串联又有并联。可以是多个电池单体20先串联或并联或混联组成电池模块，多个电池模块再串联或并联或混联形成一个整体，并容纳于箱体10内。也可以是所有电池单体20之间直接串联或并联或混联在一起，再将所有电池单体20构成的整体容纳于箱体10内。
在一些实施例中，电池100还可以包括汇流部件，多个电池单体20之间可通过汇流部件实现电连接，以实现多个电池单体20的串联或并联或混联。汇流部件可以是金属导体，比如，铜、铁、铝、不锈钢、铝合金等。
请参照图3，图3为本申请一些实施例提供的电池单体20的爆炸图，电池单体20包括壳体21、电极组件22、端盖23、绝缘件24和泄压装置25。
壳体21是用于容纳电极组件22的部件，壳体21可以是一端形成开口的空心结构。壳体21可以是多种形状，比如，圆柱体、长方体等。壳体21的材质可以是多种，比如，铜、铁、铝、钢、铝合金等。
壳体21内的电极组件22可以是一个，也可以是多个。例如，如图3所示，电极组件22为多个，多个电极组件22层叠布置于壳体21内。
电极组件22是电池单体20中发生电化学反应的部件。电极组件22可以包括正极极片、负极极片和隔离膜。电极组件22可以是由正极极片、隔离膜和负极极片通过卷绕形成的卷绕式结构，也可以是由正极极片、隔离膜和负极极片通过层叠布置形成的层叠式结构。
正极极片可以包括正极集流体和涂覆于正极集流体相对的两侧的正极活性物质层。负极极片可以包括负极集流体和涂覆于负极集流体相对的两侧的负极活性物质层。电极组件22具有正极极耳221和负极极耳222，正极极耳221可以是正极极片上未涂覆正极活性物质层的部分，负极极耳222可以是负极极片上未涂覆负极活性物质层的部分。
端盖23是盖合于壳体21的开口以将电池单体20的内部环境与外部环境隔绝的部件。端盖23盖合于壳体21的开口，端盖23与壳体21共同限定出用于容纳电极组件22、电解液以及其他部件的密封空间。端盖23的形状可以与壳体21的形状相适配，比如，壳体21为长方体结构，端盖23为与壳体21相适配的矩形板状结构，再如，壳体21为圆柱体结构，端盖23为与壳体21相适配的圆形板状结构。端盖23的材质也可以是多种，比如，铜、铁、铝、钢、铝合金等，端盖23的材质与壳体21的材质可以相同，也可以不同。
端盖23上可以设置电极端子，电极端子用于与电极组件22电连接，以输出电池单体20的电能。电极端子可以包括正极电极端子231和负极电极端子232，正极电极端子231用于与正极极耳221电连接，负极电极端子232用于与负极极耳222电连接。正极电极端子231与正极极耳221可以直接连接，也可以间接连接，负极电极端子232与负极极耳222可以直接连接，也可以间接连接。示例性的，正极电极端子231通过一个集流构件26与正极极耳221电连接，负极电极端子232通过另一个集流构件26与负极极耳222电连接。
绝缘件24是将壳体21与电极组件22分隔的部件，通过绝缘件24来实现壳体21与电极组件22的绝缘隔离。绝缘件24为绝缘材质，绝缘件24可以是诸如塑料、橡胶等绝缘材质。示例性的，绝缘件24周向包覆于电极组件22的外周，可理解的，在电极组件22为多个的情况下，绝缘件24周向包覆于多个电极组件22整体的外周。
泄压装置25是泄放电池单体20内部的压力的部件，在电池单体20内部的压力或温度达到阈值时，通过泄压装置25泄放电池单体20内部的压力。泄压装置25可以是设置于端盖23上的部件，也可以是壳体21作用泄压装置25。以下结合附图对泄压装置25的具体结构进行详细阐述。
请参照图4和图5，图4为本申请一些实施例提供的泄压装置25的结构示意图，图5为图4所示的泄压部2511的截面图，泄压装置25包括泄压本体251和多个刻痕槽252。泄压本体251包括泄压部2511，泄压部2511在其厚度方向上具有相对的第一表面2511a和第二表面2511b。多个刻痕槽252沿第一表面2511a到第二表面2511b的方向依次布置于泄压部2511，在泄压部2511的厚度方向上相邻的两个刻痕槽252中，远离第一表面2511a的刻痕槽252的最大宽度小于靠近第一表面2511a的刻痕槽252的最小宽度。
在泄压部2511的厚度方向上相邻的两个刻痕槽252中，远离第一表面2511a的刻痕槽252的最大宽度小于靠近第一表面2511a的刻痕槽252的最小宽度，也就是说，多个刻痕槽252的宽度沿着第一表面2511a到第二表面2511b的方向逐级减小。远离第一表面2511a的刻痕槽252的最大宽度以及靠近第一表面2511a的刻痕槽252的最小宽度是相邻的两个刻痕槽252在同一方向上的尺寸。远离第一表面2511a的刻痕槽252的最大宽度并不限制相邻的两个刻痕槽252中远离第一表面2511a的刻痕槽252的宽度是渐变的，在远离第一表面2511a的刻痕槽252的宽度未沿着泄压部2511的厚度方向变化的情况下，远离第一表面2511a的刻痕槽252的宽度也可称之为最大宽度。靠近第一表面2511a的刻痕槽252的最小宽度并不限制相邻的两个刻痕槽252中靠近第一表面2511a的刻痕槽252的宽度是渐变的，在靠近第一表面2511a的刻痕槽252的宽度未沿着泄压部2511的厚度方向变化的情况下，靠近第一表面2511a的刻痕槽252的宽度也可以称之为最小宽度。也就是说，在刻痕槽252的宽度未沿着泄压部2511的厚度方向变化的情况下，“在泄压部2511的厚度方向上相邻的两个刻痕槽252中，远离第一表面2511a的刻痕槽252的最大宽度小于靠近第一表面2511a的刻痕槽252的最小宽度”，可以理解为“泄压部2511的厚度方向上相邻的两个刻痕槽252中，远离第一表面2511a的刻痕槽252的宽度小于靠近第一表面2511a的刻痕槽252的宽度”。
泄压部2511上沿其厚度方向依次设置刻痕槽252可以是两个、三个、四个等。泄压部2511上的多个刻痕槽252可以采用多种方式加工成型，比如冲压成型、铣削加工成型等。以采用冲压成型的方式成型多个刻痕槽252为例，可沿着第一表面2511a到第二表面2511b的方向在泄压部2511上依次冲压成型出多个刻痕槽252。比如，泄压部2511上沿其厚度方向依次设置三个刻痕槽252，可以先在第一表面2511a上冲压成型出第一个刻痕槽252，再在第一个刻痕槽252的底面上冲压成型出第二个刻痕槽252，再在第二个刻痕槽252的底面上冲压成型出第三个刻痕槽252。
泄压部2511的第一表面2511a和第二表面2511b为泄压部2511在其厚度方向上相对的两个表面，第一表面2511a与第二表面2511b之间的距离即为泄压部2511的厚度。
泄压本体251可以是安装于端盖23上的部件，比如，泄压本体251为安装于端盖23上的防爆片。泄压本体251也可以是用于容纳电极组件22的壳体21。可以是泄压本体251的一部分为泄压部2511，也可以是泄压本体251整体为泄压部2511。比如，泄压本体251为安装于端盖23上的防爆片，可以是泄压本体251整体为泄压部2511；再如，泄压本体251为用于容纳电极组件22的壳体21，泄压部2511则可以是壳体21的一个壁或是一个壁的一部分。
在泄压装置25中，由于泄压部2511上设置有多个刻痕槽252，多个刻痕槽252沿泄压部2511的第一表面2511a到第二表面2511b的方向依次布置于泄压部2511，且在泄压部2511的厚度方向上相邻的两个刻痕槽252中，远离第一表面2511a的刻痕槽252的最大宽度小于靠近第一表面2511a的刻痕槽252的最小宽度，这种结构的泄压装置25采用多级刻痕槽252结构，可以降低在成型每级刻痕槽252时泄压部2511所受到的成型力，降低泄压部2511产生裂纹的风险，泄压装置 25不易因泄压部2511在设置刻痕槽252的位置产生裂纹而失效，提高泄压装置25的长期可靠性。
在泄压部2511上成型多个刻痕槽252时，可从第一表面2511a到第二表面2511b的方向在泄压部2511上逐极成型刻痕槽252，每极刻痕槽252的成型深度相对较浅，使得泄压部2511受到的成型力较小，既可降低泄压部2511产生裂纹的风险，又可以提高第一表面2511a的平面度。
此外，由于多个刻痕槽252的宽度沿着第二表面2511b到第一表面2511a的方向逐级增大，泄压部2511在刻痕槽252的位置破裂后可以形成较大的裂缝，具有很好的泄压效果。
在一些实施例中，请继续参照图5，多个刻痕槽252包括延伸方向一致的第一刻痕槽2521和第二刻痕槽2522，第一刻痕槽2521设置于第二刻痕槽2522的底面。
多个刻痕槽252包括第一刻痕槽2521和第二刻痕槽2522，也就是说，在多个刻痕槽252中，有一个刻痕槽252为第一刻痕槽2521，有另一个刻痕槽252为第二刻痕槽2522。当然，可以是多个刻痕槽252中只有两个刻痕槽252，两个刻痕槽252分别为第一刻痕槽2521和第二刻痕槽2522。
第一刻痕槽2521和第二刻痕槽2522两者的延伸方向一致，即第一刻痕槽2521的长度方向与第二刻痕槽2522的长度方向一致。第二刻痕槽2522的底面是指第二刻痕槽2522的槽壁面中最靠近第二表面2511b的面，也就是与第二刻痕槽2522的槽侧面相连的面。第一刻痕槽2521设置于第二刻痕槽2522的底面，可理解的，在泄压部2511的厚度方向上，第一刻痕槽2521较第二刻痕槽2522更靠近于第二表面2511b，第一刻痕槽2521从第二刻痕槽2522的底面向靠近第二表面2511b的方向凹陷。第二刻痕槽2522的底面上可以设置一个第一刻痕槽2521，也可以设置多个第一刻痕槽2521。示例性的，第二刻痕槽2522的底面设置一个第一刻痕槽2521，即一个第二刻痕槽2522对应设置一个第一刻痕槽2521。当然，第一刻痕槽2521可以设置于第二刻痕槽2522的底面在第二刻痕槽2522的宽度方向上的中间位置。
示例性的，如图5所示，在多个刻痕槽252只包括两个刻痕槽252的情况下，第二刻痕槽2522则设置于第一表面2511a，即第二刻痕槽2522从第一表面2511a向靠近第二表面2511b的方向凹陷。第二刻痕槽2522在其宽度方向上相对的两个槽侧面的距离从第一表面2511a到第二表面2511b的方向逐渐增减小，即第二刻痕槽2522的宽度沿第一表面2511a到第二表面2511b的方向逐渐减小，当然，第二刻痕槽2522在其宽度方向上相对的两个槽侧面可以是斜面。同样，第一刻痕槽2521在其宽度方向上相对的两个槽侧面的距离从第一表面2511a到第二表面2511b的方向逐渐减小，即第一刻痕槽2521的宽度沿第一表面2511a到第二表面2511b的方向逐渐减小，当然，第一刻痕槽2521在其宽度方向上相对的两个槽侧面也可以是斜面。
在本实施例中，由于第一刻痕槽2521的延伸方向与第二刻痕槽2522的延伸方向一致，第一刻痕槽2521设置于第二刻痕槽2522的底面，这种结构一方面便于第一刻痕槽2521成型，保证第一刻痕槽2521的长度，另一方面可以保证第一刻痕槽2521的最大宽度小于第二刻痕槽2522的最小宽度。
在一些实施例中，请参照图6和图7，图6为本申请又一些实施例提供的泄压装置25的局部视图，图7为图6所示的泄压部2511的截面图，多个刻痕槽252还包括第三刻痕槽2523，第三刻痕槽2523设置于第一表面2511a，第二刻痕槽2522设置于第三刻痕槽2523的底面。
多个刻痕槽252还包括第三刻痕槽2523，可以理解的，可以是多个刻痕槽252中只包括第一刻痕槽2521、第二刻痕槽2522和第三刻痕槽2523，也可以是除了第一刻痕槽2521、第二刻痕槽2522和第三刻痕槽2523三者以外，还包括其他刻痕槽252，比如，在第一刻痕槽2521的底面继续设置刻痕槽252。
第三刻痕槽2523设置于第一表面2511a，即第二刻痕槽2522从第一表面2511a向靠近第二表面2511b的方向凹陷。第三刻痕槽2523为最靠近第一表面2511a的刻痕槽252。第三刻痕槽2523的底面是指第三刻痕槽2523的槽壁面中最靠近第二表面2511b的面，也就是与第三刻痕槽2523的槽侧面相连的面。第二刻痕槽2522设置于第三刻痕槽2523的底面，可理解的，在泄压部2511的厚度方向上，第二刻痕槽2522较第三刻痕槽2523更靠近于第二表面2511b，第二刻痕槽 2522从第三刻痕槽2523的底面向靠近第二表面2511b的方向凹陷。第三刻痕槽2523的底面上可以设置一个第二刻痕槽2522，也可以甚至多个第二刻痕槽2522。
上述技术方案中，多个刻痕槽252还包括设置于第一表面2511a的第三刻痕槽2523，第二刻痕槽2522设置于第三刻痕槽2523的底面，也就是说，泄压部2511上设置有三级刻痕槽252，保证在成型每级刻痕槽252时泄压部2511所受到的成型力不会过大，降低泄压部2511产生裂纹的风险。
在一些实施例中，请继续参照图6，第三刻痕槽2523的底面设置有多个第二刻痕槽2522。
第三刻痕槽2523的形状可以是多种，比如，第三刻痕槽2523为圆形槽、矩形槽等。示例性的，在图6中，第三刻痕槽2523为矩形槽。
设置于第三刻痕槽2523的底面上的多个第二刻痕槽2522可以有多种布置方式，比如，多个第二刻痕槽2522平行布置，再如，如图6所示，多个第二刻痕槽2522构成近似“H”形结构。
在本实施例中，由于第三刻痕槽2523的底面上设有多个第二刻痕槽2522，使得泄压部2511能够在各个第二刻痕槽2522的位置破裂实现泄压，具有更好的泄压效果，提高了泄压速率。此外，由于一个第三刻痕槽2523对应多个第二刻痕槽2522，可简化成型工艺，降低成型成本。
在一些实施例中，请参照图8，图8为图6所示的第一刻痕槽2521、第二刻痕槽2522和第三刻痕槽2523的位置关系图，多个第二刻痕槽2522包括第一槽段2522a、第二槽段2522b和第三槽段2522c，第一槽段2522a和第二槽段2522b间隔设置，第一槽段2522a和第二槽段2522b均与第三槽段2522c相交。泄压部2511包括由第一槽段2522a、第二槽段2522b和第三槽段2522c共同界定出开启区2511c，开启区2511c被配置为以第一槽段2522a、第二槽段2522b和第三槽段2522c为边界打开。
多个第二刻痕槽2522包括第一槽段2522a、第二槽段2522b和第三槽段2522c，也就是说，在多个第二刻痕槽2522中，一个第二刻痕槽2522为第一槽段2522a，又一个第二刻痕槽2522为第二槽段2522b，再一个第二刻痕槽2522为第三槽段2522c。当然，可以是多个第二刻痕槽2522中只有三个第二刻痕槽2522，三个第二刻痕槽2522则分别为第一槽段2522a、第二槽段2522b和第三槽段2522c。
开启区2511c为泄压部2511由第一槽段2522a、第二槽段2522b和第三槽段2522c共同界定出的区域。第一槽段2522a、第二槽段2522b和第三槽段2522c界定出的开启区2511c可以是一个，也可以是两个。比如，第一槽段2522a、第二槽段2522b和第三槽段2522c形成近似“匚”形结构，开启区2511c则为一个；再如，第一槽段2522a、第二槽段2522b和第三槽段2522c形成近似“H”形结构，开启区2511c则为两个。
开启区2511c为泄压部2511泄压的区域，对于电池单体20而言，在电池单体20内部压力或温度达到阈值时，泄压部2511在开启区2511c的部分将以第一槽段2522a、第二槽段2522b和第三槽段2522c为边界打开，以实现泄压。
由于多个第二刻痕槽2522设置于第三刻痕槽2523的底面，第一槽段2522a、第二槽段2522b和第三槽段2522c则均设置于第三刻痕槽2523的底面，开启区2511c则位于第三刻痕槽2523的范围内，第三刻痕槽2523能够为泄压部2511位于开启区2511c的部分在以第一槽段2522a、第二槽段2522b和第三槽段2522c为边界打开的过程中提供避让空间。
在本实施例中，由于第一槽段2522a与第二槽段2522b间隔设置，第二槽段2522b和第二槽段2522b均与第三槽段2522c相交，第一槽段2522a、第二槽段2522b和第三槽段2522c共同界定出开启区2511c，这种结构使得泄压部2511在第一槽段2522a、第二槽段2522b与第二槽段2522b的位置破裂后，泄压部2511位于开启区2511c的部分将打开泄压，增大了泄压部2511的泄压面积，提高了泄压部2511的泄压速率。
在一些实施例中，请继续参照图8，多个第二刻痕槽2522还包括第四槽段2522d，在第三槽段2522c的延伸方向上，第四槽段2522d位于第一槽段2522a与第二槽段2522b之间，第四槽段 2522d与第三槽段2522c相交。
多个第二刻痕槽2522包括第四槽段2522d，可理解的，可以是多个第二刻痕槽2522中只包括第一槽段2522a、第二槽段2522b、第三槽段2522c和第四槽段2522d，也可以是除了第一槽段2522a、第二槽段2522b、第三槽段2522c和第四槽段2522d四者以外，还包括其他槽段。示例性的，第四槽段2522d可以平行于第一槽段2522a和第二槽段2522b，且垂直于第三槽段2522c。
在本实施例中，位于第一槽段2522a与第二槽段2522b之间的第四槽段2522d与第三槽段2522c相交，泄压部2511在第三槽段2522c与第四槽段2522d相交位置应力更为集中，更容易破裂，使得泄压部2511在泄压过程中从第三槽段2522c与第四槽段2522d相交的位置沿着第三槽段2522c破裂，并在第三槽段2522c破裂后沿着第一槽段2522a和第二槽段2522b破裂，以实现快速泄压。
在一些实施中，第一槽段2522a的深度和第二槽段2522b的深度相等，第三槽段2522c的深度等于第四槽段2522d的深度，第一槽段2522a的深度小于第三槽段2522c的深度，使得泄压部2511在泄压过程中更容易从第三槽段2522c与第四槽段2522d相交的位置沿着第三槽段2522c开始破裂。在另一些实施例中，第一槽段2522a的深度、第二槽段2522b的深度和第三槽段2522c的深度均小于第四槽段2522d的深度，这样也可以保证压部在泄压过程中更容易从第三槽段2522c与第四槽段2522d相交的位置沿着第三槽段2522c开始破裂。
在一些实施例中，在第三槽段2522c的延伸方向上，第四槽段2522d与第三槽段2522c相交位置到第一槽段2522a的距离等于第四槽段2522d与第三槽段2522c相交位置到第二槽段2522b的距离。
在第三槽段2522c的延伸方向上，第四槽段2522d与第三槽段2522c相交位置到第一槽段2522a的距离，即为第三槽段2522c在第四槽段2522d与第一槽段2522a之间的部分的长度。在第三槽段2522c的延伸方向上，第四槽段2522d与第三槽段2522c相交位置到第二槽段2522b的距离，即为第三槽段2522c在第四槽段2522d与第二槽段2522b之间的部分的长度。
在本实施例中，由于第四槽段2522d与第三槽段2522c相交位置到第一槽段2522a的距离等于第四槽段2522d与第三槽段2522c相交位置到第二槽段2522b的距离，使得泄压部2511能够在第四槽段2522d与第三槽段2522c相交的位置沿着第三槽段2522c破裂后，沿着第一槽段2522a和第二槽段2522b同步破裂。
在一些实施例中，请继续参照图8，第一槽段2522a、第二槽段2522b和第三槽段2522c界定出两个开启区2511c，两个开启区2511c分别位于第三槽段2522c的两侧。
第一槽段2522a、第二槽段2522b和第三槽段2522c共同界定出两个开启区2511c，第一槽段2522a、第二槽段2522b和第三槽段2522c可以构成近似“H”形结构。两个开启区2511c分别位于第三槽段2522c的两侧，使得两个开启区2511c以第三槽段2522c分界，泄压部2511在第三槽段2522c的位置破裂后，两个开启区2511c将沿着第一槽段2522a和第二槽段2522b以对开的形式打开，以实现泄压。
需要说明的是，无论多个第二刻痕槽2522中是否包括第四槽段2522d，第一槽段2522a、第二槽段2522b和第三槽段2522c均可以界定出两个开启区2511c。
在本实施例中，由于第一槽段2522a、第二槽段2522b和第三槽段2522c界定出两个开启区2511c，两个开启区2511c分别位于第三槽段2522c的两侧，泄压部2511在泄压过程中，泄压部2511在两个泄压区的部分能够以对开的方式打开泄压，可有效提高泄压部2511的泄压速率。
在一些实施例中，请继续参照图7和图8，第二表面2511b上设有至少部分位于开启区2511c的缺口槽253，在第一槽段2522a的延伸方向上，缺口槽253与第三槽段2522c存在距离。
第二表面2511b上设有至少部分位于开启区2511c的缺口槽253，可理解的，缺口槽253从第二表面2511b沿面向第一表面2511a的方向凹陷，缺口槽253至少部分位于开启区2511c。当然，可以是缺口槽253完全位于开启区2511c内，也可以是缺口槽253部分位于开启区2511c内。
缺口槽253可以沿着第三槽段2522c的延伸方向延伸，使得缺口槽253平行于第三槽段2522c。
在第一槽段2522a、第二槽段2522b和第三槽段2522c共同界定出一个开启区2511c的实施例中，第一表面2511a可以对应设置一个缺口槽253。结合图7和图8，在第一槽段2522a、第二槽段2522b和第三槽段2522c共同界定出两个开启区2511c的实施例中，第一表面2511a可以对应设置两个缺口槽253，一个开启区2511c对应设置一个缺口槽253。
在本实施例中，缺口槽253在第一槽段2522a的延伸方向上与第三槽段2522c存在距离，且缺口槽253的至少部分位于开启区2511c内，使得泄压部2511在泄压过程，泄压部2511位于开启区2511c的一部分能够以泄压部2511位于缺口槽253的位置为轴翻转，更加容易打开泄压。
在一些实施例中，第一表面2511a与第二表面2511b的距离为H0，最靠近第二表面2511b的刻痕槽252的底面到第二表面2511b的距离为H1，H0与H1满足关系式：H1/H0<0.2。
第一表面2511a与第二表面2511b的距离即为泄压部2511的厚度。最靠近第二表面2511b的刻痕槽252的底面到第二表面2511b的距离即为最靠近第二表面2511b的刻痕槽252的底面与第二表面2511b之间的部分的厚度。在多个刻痕槽252只包括第一刻痕槽2521、第二刻痕槽2522和第三刻痕槽2523的实施例中，第一刻痕槽2521即为最靠近第二表面2511b的刻痕槽252。
在本实施例中，最靠近第二表面2511b的刻痕槽252的底面到第二表面2511b的距离与第一表面2511a到第二表面2511b的距离的比值小于0.2，使得最靠近第二表面2511b的刻痕槽252的底面与第二表面2511b之间的部分的厚度在泄压部2511的总厚度中的占比较小，使得最靠近第二表面2511b的刻痕槽252的底面与第二表面2511b之间的部分能够正常破裂，以实现泄压。
在一些实施例中，最靠近第二表面2511b的刻痕槽252的底面到第二表面2511b的距离为H1，H1满足关系式H1<0.5mm。
在本实施例中，最靠近第二表面2511b的刻痕槽252的底面到第二表面2511b的距离小于0.5mm，使得最靠近第二表面2511b的刻痕槽252的底面与第二表面2511b之间的部分的厚度较小，易于破裂泄压。
在一些实施例中，设置于第一表面2511a的刻痕槽252的深度为H2，H2满足关系式H2<1mm。
设置于第一表面2511a的刻痕槽252的深度即为设置于第一表面2511a的刻痕槽252的底面到第一表面2511a的距离。在多个刻痕槽252包括第一刻痕槽2521、第二刻痕槽2522和第三刻痕槽2523的实施例中，第三刻痕槽2523即为设置于第一表面2511a的刻痕槽252。
在本实施例中，设置于第一表面2511a的刻痕槽252的深度小于1mm，使得泄压部2511最外侧的刻痕槽252的深度较小，降低了泄压部2511在该刻痕槽252在成型过程所受到的成型力，降低泄压部2511产生裂纹的风险。
在一些实施例中，最靠近第二表面2511b的刻痕槽252与设置于第一表面2511a的刻痕槽252之间的刻痕槽252的深度为H3，H3满足关系式H3<1.5mm。
在本实施例中，多个刻痕槽252中包括至少三个刻痕槽252。以多个刻痕槽252只包括第一刻痕槽2521、第二刻痕槽2522和第三刻痕槽2523为例，最靠近第二表面2511b的刻痕槽252即为第一刻痕槽2521，设置于第一表面2511a的刻痕槽252即为第三刻痕槽2523，最靠近第二表面2511b的刻痕槽252与设置于第一表面2511a的刻痕槽252之间的刻痕槽252即为第二刻痕槽2522。
在本实施例中，最靠近第二表面2511b的刻痕槽252与设置于第一表面2511a的刻痕槽252之间的刻痕槽252的深度小于1.5mm，使得泄压部2511上除了最靠近第二表面2511b的刻痕槽252和设置于第一表面2511a的刻痕槽252以外的刻痕槽252的深度较小，降低成型过程泄压部2511所受到的成型力，降低泄压部2511产生裂纹的风险。
在一些实施例中，请参照图9，图9为本申请又一些实施例提供的泄压装置25的结构示 意图，泄压本体251内部形成有容纳空间，泄压本体251具有界定出容纳空间的多个壁，容纳空间用于收容电极组件22，多个壁中的一个壁形成有泄压部2511。
多个壁中的一个壁形成有泄压部2511，可以是一个壁的一部分为泄压部2511，也可以是一个壁的整体为泄压部2511。泄压部2511的第一表面2511a可以是壁的外表面，也可以是壁的内表面。壁的外表面即为壁背离电极组件22的表面，壁的内表面即为壁面向电极组件22的表面。
泄压本体251可以是多种形状，比如，长方体、圆柱体等。
在本实施例中，泄压本体251的多个壁限定出用于收容电极组件22的容纳腔，多个壁中的一个壁形成有泄压部2511，使得泄压装置25既具有容纳电极组件22的容纳功能，又具有泄压功能。
在一些实施例中，请继续参照图9，泄压本体251的多个壁包括周壁2512和底壁2513，周壁2512围设于底壁2513的边缘，周壁2512与底壁2513共同限定出容纳空间，底壁2513形成有泄压部2511。
周壁2512围设于底壁2513的边缘，可以使得泄压本体251在底壁2513相对的一端形成开口，端盖23用于盖合于开口。
在泄压本体251为圆柱体的实施例中，泄压本体251可以有两个壁，一个壁为底壁2513另一个壁为周壁2512。如图9所示，在泄压本体251为长方体的实施例中，泄压本体251可以有五个壁，一个底壁2513和四个侧壁，四个侧壁首尾依次连接形成周壁2512。
在一些实施例中，周壁2512与底壁2513为一体成型结构。
周壁2512与底壁2513为一体成型结构，也就是说，周壁2512与底壁2513采用一体成型的方式成型在一起。
在本实施例中，由于底壁2513形成有泄压部2511，周壁2512与底壁2513为一体成型结构，使得周壁2512与具有泄压功能的底壁2513具有很好的牢固性，这种一体式设计能够简化成型工艺，降低生产成本。
在一些实施例中，第一表面2511a为底壁2513的外表面，也就是说，泄压部2511上的多个刻痕槽252从底壁2513的外表面向底壁2513的内表面依次布置，便于在泄压本体251上加工刻痕槽252。
第二方面，本申请实施例提供一种电池单体20，包括上述任意一个实施例提供的泄压装置25。
第三方面，一种电池100，包括箱体10和上述任意一个实施例提供的电池单体20，箱体10用于容纳电池单体20。
第四方面，一种用电设备，包括上述任意一个实施例提供的电池100。
用电设备可以是上述任一应用电池100的设备。
请参照图4和图5，本申请实施例还提供一种壳体21，壳体21包括多个壁，多个壁共同限定出用于容纳电极组件22的容纳空间，至少一个壁上设有多个刻痕槽252，壁在其厚度方向上具有相对的第一表面2511a和第二表面2511b，多个刻痕槽252，沿第一表面2511a到第二表面2511b的方向依次布置于壁上，在壁的厚度方向上相邻的两个刻痕槽252中，远离第一表面2511a的刻痕槽252的最大宽度小于靠近第一表面2511a的刻痕槽252的最小宽度。这种结构的壳体21集泄压功能和容纳功能为一体，采用多级刻痕槽252结构，可以降低在成型每级刻痕槽252时壳体21所受到的成型力，降低壳体21产生裂纹的风险，提高泄压装置25的长期可靠性。
本申请实施例提供一种泄压装置25的制造方法，请参照图10，图10为本申请一些实施例提供的泄压装置25的制造方法的流程图，该方法包括：
S100：提供泄压本体251，泄压本体251包括泄压部2511，泄压部2511在其厚度方向上具有相对的第一表面2511a和第二表面2511b；
S200：在泄压部2511上沿第一表面2511a到第二表面2511b的方向依次加工出多个刻痕槽252；其中，在厚度方向上相邻的两个刻痕槽252中，远离第一表面2511a的刻痕槽252的最大宽度小于靠近第一表面2511a的刻痕槽252的最小宽度。
在一些实施例中，在泄压部2511上沿第一表面2511a到第二表面2511b的方向依次加工出多个刻痕槽252包括：在泄压部2511上沿第一表面2511a到第二表面2511b的方向上依次冲压出多个刻痕槽252。
通过冲压的方式在泄压部2511上从第一表面2511a到第二表面2511b的方向上依次成型多个刻痕槽252，成型工艺简单，能够降低冲压每级刻痕槽252时泄压部2511所受到的冲压力，降低泄压部2511产生裂纹的风险。
需要说明的是，通过上述各实施例提供的制造方法制造的泄压装置25的相关结构，可参见前述各实施例提供的泄压装置25，在此不再赘述。
此外，本申请实施例提供一种泄压装置25的制造设备2000，请参照图11，图11为本申请一些实施例提供的泄压装置25的制造设备2000的示意性框图，制造设备2000包括第一提供装置2100和加工装置2200。第一提供装置2100用于提供泄压本体251，泄压本体251包括泄压部2511，泄压部2511在其厚度方向上具有相对的第一表面2511a和第二表面2511b。加工装置2200用于在泄压部2511上沿第一表面2511a到第二表面2511b的方向依次加工出多个刻痕槽252。其中，在厚度方向上相邻的两个刻痕槽252中，远离第一表面2511a的刻痕槽252的最大宽度小于靠近第一表面2511a的刻痕槽252的最小宽度。
需要说明的是，通过上述实施例提供的制造设备2000制造的泄压装置25的相关结构，可参见前述各实施例提供的泄压装置25，在此不再赘述。
需要说明的是，在不冲突的情况下，本申请中的实施例及实施例中的特征可以相互组合。
以上实施例仅用以说明本申请的技术方案，并不用于限制本申请，对于本领域的技术人员来说，本申请可以有各种更改和变化。凡在本申请的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本申请的保护范围之内。

Claims (23)

  1. 一种泄压装置，其中，包括：
    泄压本体，包括泄压部，所述泄压部在其厚度方向上具有相对的第一表面和第二表面；
    多个刻痕槽，沿所述第一表面到所述第二表面的方向依次布置于所述泄压部，在所述厚度方向上相邻的两个刻痕槽中，远离所述第一表面的刻痕槽的最大宽度小于靠近所述第一表面的刻痕槽的最小宽度。
  2. 根据权利要求1所述的泄压装置，其中，所述多个刻痕槽包括延伸方向一致的第一刻痕槽和第二刻痕槽，所述第一刻痕槽设置于所述第二刻痕槽的底面。
  3. 根据权利要求2所述的泄压装置，其中，所述多个刻痕槽还包括第三刻痕槽，所述第三刻痕槽设置于所述第一表面，所述第二刻痕槽设置于所述第三刻痕槽的底面。
  4. 根据权利要求3所述的泄压装置，其中，所述第三刻痕槽的底面设置有多个第二刻痕槽。
  5. 根据权利要求4所述的泄压装置，其中，所述多个第二刻痕槽包括第一槽段、第二槽段和第三槽段，所述第一槽段和所述第二槽段间隔设置，所述第一槽段和所述第二槽段均与所述第三槽段相交；
    所述泄压部包括由所述第一槽段、第二槽段和第三槽段共同界定出开启区，所述开启区被配置为以第一槽段、第二槽段和第三槽段为边界打开。
  6. 根据权利要求5所述的泄压装置，其中，所述多个第二刻痕槽还包括第四槽段，在所述第三槽段的延伸方向上，所述第四槽段位于所述第一槽段与所述第二槽段之间，所述第四槽段与所述第三槽段相交。
  7. 根据权利要求6所述的泄压装置，其中，在所述第三槽段的延伸方向上，所述第四槽段与所述第三槽段相交位置到第一槽段的距离等于所述第四槽段与所述第三槽段相交位置到第二槽段的距离。
  8. 根据权利要求5-7任一项所述的泄压装置，其中，所述第一槽段、所述第二槽段和所述第三槽段界定出两个开启区，两个开启区分别位于所述第三槽段的两侧。
  9. 根据权利要求5-8任一项所述的泄压装置，其中，所述第二表面上设有位于所述开启区的缺口槽，在第一槽段的延伸方向上，所述缺口槽与所述第三槽段存在距离。
  10. 根据权利要求1-9任一项所述的泄压装置，其中，所述第一表面与所述第二表面的距离为H0，最靠近所述第二表面的刻痕槽的底面到所述第二表面的距离为H1，H0与H1满足关系式：
    H1/H0<0.2。
  11. 根据权利要求1-10任一项所述的泄压装置，其中，最靠近所述第二表面的刻痕槽的底面到所述第二表面的距离为H1，H1满足关系式H1<0.5mm。
  12. 根据权利要求1-11任一项所述的泄压装置，其中，设置于所述第一表面的刻痕槽的深度为H2，H2满足关系式H2<1mm。
  13. 根据权利要求1-12任一项所述的泄压装置，其中，最靠近所述第二表面的刻痕槽与设置于所述第一表面的刻痕槽之间的刻痕槽的深度为H3，H3满足关系式H3<1.5mm。
  14. 根据权利要求1-13任一项所述的泄压装置，其中，所述泄压本体内部形成有容纳空间，所述泄压本体具有界定出所述容纳空间的多个壁，所述容纳空间用于收容电极组件，所述多个壁中的一个壁形成有所述泄压部。
  15. 根据权利要求14所述的泄压装置，其中，所述多个壁包括周壁和底壁，所述周壁围设于所述底壁的边缘，所述周壁与所述底壁共同限定出所述容纳空间，所述底壁形成有所述泄压部。
  16. 根据权利要求15所述的泄压装置，其中，所述周壁与所述底壁为一体成型结构。
  17. 根据权利要求15或16所述的泄压装置，其中，所述第一表面为所述底壁的外表面。
  18. 一种电池单体，包括根据权利要求1-17任一项所述的泄压装置。
  19. 一种电池，包括：
    根据权利要求18所述的电池单体；以及
    箱体，用于容纳所述电池单体。
  20. 一种用电设备，包括根据权利要求19所述的电池。
  21. 一种泄压装置的制造方法，所述方法包括：
    提供泄压本体，所述泄压本体包括泄压部，所述泄压部在其厚度方向上具有相对的第一表面和第二表面；
    在所述泄压部上沿所述第一表面到所述第二表面的方向依次加工出多个刻痕槽；
    在所述厚度方向上相邻的两个刻痕槽中，远离所述第一表面的刻痕槽的最大宽度小于靠近所述第一表面的刻痕槽的最小宽度。
  22. 根据权利要求21所述的泄压装置的制造方法，其中，所述在所述泄压部上沿所述第一表面到所述第二表面的方向依次加工出多个刻痕槽包括：
    在所述泄压部上沿所述第一表面到所述第二表面的方向上依次冲压出多个刻痕槽。
  23. 一种泄压装置的制造设备，包括：
    第一提供装置，用于提供泄压本体，所述泄压本体包括泄压部，所述泄压部在其厚度方向上具有相对的第一表面和第二表面；以及
    加工装置，用于在所述泄压部上沿所述第一表面到所述第二表面的方向依次加工出多个刻痕槽；
    其中，在所述厚度方向上相邻的两个刻痕槽中，远离所述第一表面的刻痕槽的最大宽度小于靠近所述第一表面的刻痕槽的最小宽度。
PCT/CN2021/115766 2021-08-31 2021-08-31 泄压装置、电池单体、电池及用电设备 WO2023028864A1 (zh)

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CN202222326423.5U CN218769952U (zh) 2021-08-31 2022-08-31 泄压装置、电池单体、电池及用电设备
KR1020237016558A KR20230088460A (ko) 2021-08-31 2022-08-31 감압 장치, 배터리 셀, 배터리 및 전기 설비
PCT/CN2022/116275 WO2023030399A1 (zh) 2021-08-31 2022-08-31 泄压装置、电池单体、电池及用电设备
EP22863540.5A EP4287380A1 (en) 2021-08-31 2022-08-31 Pressure relief device, battery cell, battery, and power consumption apparatus
CN202280005459.3A CN116075964A (zh) 2021-08-31 2022-08-31 泄压装置、电池单体、电池及用电设备
JP2023528257A JP2023549795A (ja) 2021-08-31 2022-08-31 圧力解放装置、電池セル、電池及び電気装置
JP2023530008A JP2023549907A (ja) 2021-08-31 2022-08-31 放圧装置、電池セル、電池及び電力消費機器
CN202222314334.9U CN218414924U (zh) 2021-08-31 2022-08-31 泄压装置、电池单体、电池及用电设备
CN202222314407.4U CN218414925U (zh) 2021-08-31 2022-08-31 泄压装置、电池单体、电池及用电设备
EP22863539.7A EP4239777A1 (en) 2021-08-31 2022-08-31 Pressure relief apparatus, battery cell, battery and electrical device
JP2023530006A JP2023549906A (ja) 2021-08-31 2022-08-31 放圧装置、電池セル、電池及び電力消費機器
PCT/CN2022/116299 WO2023030405A1 (zh) 2021-08-31 2022-08-31 泄压装置、电池单体、电池及用电设备
US18/187,207 US20230223644A1 (en) 2021-08-31 2023-03-21 Pressure relief apparatus, battery cell, battery, and electrical device
US18/333,167 US20230327275A1 (en) 2021-08-31 2023-06-12 Pressure relief apparatus, battery cell, battery, and electrical device
US18/464,845 US20230420793A1 (en) 2021-08-31 2023-09-11 Pressure relief apparatus, battery cell, battery, and power consuming device
US18/413,080 US20240154240A1 (en) 2021-08-31 2024-01-16 Pressure relief apparatus, battery cell, battery, and power consuming device

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