CN108807785B - Power battery explosion-proof device, power battery and electric automobile - Google Patents
Power battery explosion-proof device, power battery and electric automobile Download PDFInfo
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- CN108807785B CN108807785B CN201810698807.5A CN201810698807A CN108807785B CN 108807785 B CN108807785 B CN 108807785B CN 201810698807 A CN201810698807 A CN 201810698807A CN 108807785 B CN108807785 B CN 108807785B
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- 238000007789 sealing Methods 0.000 claims abstract description 39
- 230000007613 environmental effect Effects 0.000 claims abstract description 17
- 239000012528 membrane Substances 0.000 claims abstract description 8
- 230000000149 penetrating effect Effects 0.000 claims abstract description 6
- 238000009434 installation Methods 0.000 claims description 10
- 238000004880 explosion Methods 0.000 claims description 8
- 230000001681 protective effect Effects 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 8
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 230000003014 reinforcing effect Effects 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000000741 silica gel Substances 0.000 description 2
- 229910002027 silica gel Inorganic materials 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
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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
- H01M50/317—Re-sealable arrangements
- H01M50/325—Re-sealable arrangements comprising deformable valve members, e.g. elastic or flexible valve members
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- 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
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Gas Exhaust Devices For Batteries (AREA)
- Battery Mounting, Suspending (AREA)
Abstract
The invention provides a power battery explosion-proof device, a power battery and an electric automobile, and relates to the technical field of automobile safety, wherein the device comprises: the explosion-proof body comprises a mounting hole penetrating through the first end face and the second end face, and an ejector pin protruding towards the first end face is arranged in the mounting hole; the rupture membrane is fixed on the first end face and comprises a second state of sealing the mounting hole when the environmental pressure is less than a first preset pressure and a first state of being broken by the ejector pin when the environmental pressure is greater than or equal to the first preset pressure; the motion valve core is arranged on the second end surface and comprises a guide post inserted into the mounting hole; when the rupture disk is in a second state, the valve core is moved to seal the mounting hole on the second end face; when the rupture disk is in the first state, the movable valve core forms a gas flow channel at the second end surface; the spring is sleeved on the guide post inserted in the mounting hole, and the movable valve core is driven to recover to a sealing state from an opening state when the environmental pressure in the mounting hole is less than or equal to a second preset pressure. The invention improves the safety of the vehicle.
Description
Technical Field
The invention belongs to the technical field of automobile safety, and particularly relates to a power battery explosion-proof device, a power battery and an electric automobile.
Background
With the increasing severity of energy situation, the environmental awareness of people is gradually strengthened, new energy vehicles gradually enter the daily life of common people, and the safety problem therewith also gradually draws attention of manufacturers and users. The battery used by most of the power supply systems for the new energy vehicles can release heat in the using process. However, under the condition of extreme thermal runaway, the huge energy inside the power battery is reflected by the forms of expanding gas, high temperature, explosion and sparks, and in order to deal with the problem that the energy is released when the thermal runaway occurs in the closed envelope meeting the IPX7 waterproof grade of the power battery system at present, an explosion-proof valve used in a pressure container is often installed; after the energy leaks and breaks the rupture membrane, a through hole with the outside air is formed, after flame is sprayed outside the power battery system, the outside air flows back into the power battery along with the pressure reduction in the bag, and the power battery system is supported by combustion.
Disclosure of Invention
The embodiment of the invention aims to provide a power battery explosion-proof device, a power battery and an electric automobile, so that the problems that energy cannot leak and the amount of returned oxygen is large when the power battery is out of control due to heat are solved.
In order to achieve the above object, an embodiment of the present invention provides an explosion-proof device for a power battery, including:
the explosion-proof body comprises a mounting hole penetrating through a first end face and a second end face, and at least one ejector pin protruding towards the first end face is arranged in the mounting hole;
the rupture disk is fixed on the first end face; the rupture disk comprises a second state of sealing the mounting hole when the environmental pressure is less than a first preset pressure, and a first state of deforming towards the inside of the mounting hole and being broken by the ejector pin when the environmental pressure is greater than or equal to the first preset pressure;
the moving valve core is arranged at the second end face, and the moving valve core further comprises a guide post inserted into the mounting hole; wherein when the rupture disk is in the second state, the moving spool is capable of sealing the mounting hole at the second end face into a sealed state; when the rupture disk is in the first state, the moving valve core forms a gas flow channel at the second end face to form an open state;
the spring is sleeved on the guide post inserted and extended in the mounting hole; the spring can drive the movable valve core to recover from the opening state to the sealing state when the environmental pressure in the mounting hole is less than or equal to a second preset pressure; wherein the second preset pressure is less than the first preset pressure.
After the rupture disk changes from the second state to the first state, if the environmental pressure in the mounting hole is greater than the second preset pressure, the moving valve core moves in the direction away from the explosion-proof body, so that the moving valve core forms a gas flow channel at the second end face to form an open state.
The power battery explosion-proof device further comprises a mounting bracket which is integrally connected with the explosion-proof body, the mounting bracket is arranged around the explosion-proof body on a plane parallel to the cross section of the mounting hole, the first end face and one end face of the mounting bracket are located on the same plane, and the second end face protrudes out of the other end face of the mounting bracket.
The mounting bracket is fixed on the power battery shell through the matching of the nested nuts and bolts arranged on the power battery shell.
The mounting bracket and the end face of the first end face located on the same plane are provided with a first sealing groove, and a first sealing ring is arranged in the first sealing groove.
The thimble is of a sheet structure, an installation groove axially penetrating through the guide post along the guide post is formed in the guide post, and the thimble is clamped in the installation groove.
The power battery explosion-proof device further comprises a nut abutted to the spring, wherein the nut is matched with the threads on the outer wall of the guide post and used for locking the spring.
And a second sealing groove is formed in the end face, connected with the guide column, of the moving valve core, and a second sealing ring is arranged in the second sealing groove.
The power battery explosion-proof device further comprises a protection net arranged on the rupture membrane, wherein the edge of the protection net is provided with a plurality of concave parts, a plurality of convex parts are arranged on the first end face, the concave parts are clamped on the convex parts, and the protection net is fixed to the first end face.
Wherein, be provided with a plurality of fan-shaped openings on the protection net.
An embodiment of the present invention further provides a power battery, including: the power battery explosion-proof device comprises a power battery shell and the power battery explosion-proof device, wherein the power battery explosion-proof device is fixed on the power battery shell.
The embodiment of the invention also provides an electric automobile which comprises the power battery.
The technical scheme of the invention at least has the following beneficial effects:
according to the embodiment of the invention, the spring is arranged in the power battery explosion-proof device, so that when the power battery is out of control due to extreme thermal runaway, the high pressure in the power battery opens the motion valve core, and the release of high-pressure gas in the power battery is realized; when the pressure in the power battery is smaller than or equal to the resilience force of the spring, the motion valve core rebounds under the driving of the spring, so that the external fresh air is reduced from flowing back to the power battery, the heat spreading characteristic between the battery cores is reduced, the escape time is prolonged, and the safety is improved.
Drawings
Fig. 1 is a schematic diagram of a power battery explosion-proof device according to an embodiment of the invention;
FIG. 2 is a schematic view of the connection of the explosion proof body to the mounting bracket according to the embodiment of the invention;
FIG. 3 is a schematic view of a motion valve cartridge according to an embodiment of the present invention;
FIG. 4 is a front view of the explosion-proof device for power battery in accordance with the embodiment of the present invention;
FIG. 5 is a top view of a power cell explosion protection apparatus according to an embodiment of the present invention;
FIG. 6 is a left side view of the explosion-proof device for power battery in accordance with the embodiment of the present invention;
fig. 7 is an isometric view of a power cell explosion protection apparatus according to an embodiment of the invention.
Description of reference numerals:
1-an explosion-proof body, 2-a rupture membrane, 3-a movable valve core, 4-a spring, 5-a nested nut, 6-a first sealing groove, 7-a first sealing ring, 8-an ejector pin, 9-a second sealing groove, 10-a second sealing ring, 11-a mounting bracket, 12-a fan-shaped opening, 13-a reinforcing rib, 14-a trademark mark, 15-a guide column, 16-a fixing device, 17-a nut and 18-a protection net.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
The embodiment of the invention provides a power battery explosion-proof device, a power battery and an electric vehicle, aiming at the problems that when the limit thermal runaway of the power battery is caused, a protective film is broken to form a through hole between the power battery and the outside air, and the outside air flows back into the power battery along with the pressure reduction in the power battery to accelerate the thermal spread of a battery core, so that the thermal spread of the battery core when the limit thermal runaway of the power battery is delayed, and the escape time is reserved for passengers.
As shown in fig. 1 to 7, an embodiment of the present invention provides an explosion-proof apparatus for a power battery, including:
the explosion-proof body 1 comprises a mounting hole penetrating through a first end face and a second end face, and at least one ejector pin 8 protruding towards the first end face is arranged in the mounting hole; the rupture disk 2 is fixed on the first end face; the rupture disk 2 comprises a second state of sealing the mounting hole when the environmental pressure is less than a first preset pressure, and a first state of deforming towards the inside of the mounting hole and being broken by the thimble 8 when the environmental pressure is greater than or equal to the first preset pressure; the moving valve core 3 is arranged at the second end face, wherein the moving valve core 3 further comprises a guide post 15 inserted into the mounting hole; wherein, when the rupture disk 2 is in the second state, the moving spool 3 can seal the mounting hole at the second end face, forming a sealed state; when the rupture disk 2 is in the first state, the moving spool 3 forms a gas flow channel at the second end face, forming an open state; the spring 4 is sleeved on the guide post 15 inserted and extended in the mounting hole; the spring 4 can drive the moving valve core 3 to recover from the opening state to the sealing state when the environmental pressure in the mounting hole is less than or equal to a second preset pressure; wherein the second preset pressure is less than the first preset pressure.
According to the embodiment of the invention, when the limit thermal runaway of the power battery occurs, the explosion membrane 2 is deformed from the first end surface to the second end surface by the huge energy in the power battery, so that the explosion membrane 2 is in contact with the protruding end of the thimble 8, the thimble 8 breaks through the explosion membrane 2, and the motion valve core 3 moves in the direction away from the explosion-proof body 1 under the pushing of the huge energy to form a gas flow channel, so that the energy in the power battery is diffused to the outside of the power battery. When the pressure in the power battery is reduced to a second preset pressure, the spring 4 is reset to drive the motion valve core 3 to move towards the direction close to the explosion-proof body 1, so that the motion valve core 3 seals the mounting hole at the second end face, and the outside air is reduced from entering the power battery, so that the time of severe fire and other hazards of the power battery is delayed, the escape time is reserved for passengers, and the safety performance of the vehicle is improved.
It should be noted here that the spring 4 is a compression return spring, when the power battery is not in the limit thermal runaway condition, the spring 4 is in a compression state, when the power battery is in the thermal runaway condition, the spring 4 is further compressed under the action of a large amount of energy, and the motion valve core 3 moves in a direction away from the explosion-proof body 1 under the action of the large amount of energy to form a gas flow channel. Preferably, the spring 4 is a reset element such as a disc spring, so as to reduce the space occupied by the power battery explosion-proof device.
Preferably, the rupture disk 2 is a material obtained by compounding a polytetrafluoroethylene microporous film and a common fabric together through a laminating process, which is abbreviated as: e-PTFE, the rupture disk 2 is fixed on the inner wall of the explosion-proof body 1 in a hot melting mode. When the guide post 15 is inserted into the mounting hole, the thimble 8 is located inside the guide post 15, and the spring 4 is sleeved on the guide post 15.
The first preset pressure is a critical pressure value determined according to the deformation quantity of the rupture disk 2 and the distance between the rupture disk and the protruding end of the thimble 8; the second preset pressure is a compression return spring pressure of the spring 4. In order to ensure that the spring 4 can be reset after the pressure in the power battery is reduced, the corresponding relation among the pressure in the power battery, the environmental pressure in the mounting hole and the spring stiffness is determined according to a large amount of test data, and the spring meeting the required spring stiffness is selected.
Specifically, after the rupture disk 2 changes from the second state to the first state, if the ambient pressure in the mounting hole is greater than the first preset pressure, the moving valve element 3 moves in a direction away from the explosion-proof body 1, so that the spring 4 is further compressed, and the moving valve element 3 forms a gas flow channel at the second end face, forming an open state; after the rupture disk 2 is in the first state, if the environmental pressure in the mounting hole is less than or equal to the second preset pressure, the spring 4 is reset, so that the motion valve core 3 is driven to move towards the direction close to the explosion-proof body 1, and the mounting hole is closed by the motion valve core 3 at the second end face.
Further, as shown in fig. 1 and 2, in order to facilitate fixing the power battery explosion-proof device on a power battery housing, the power battery explosion-proof device of the embodiment of the invention further includes a mounting bracket 11, where the mounting bracket 11 is integrally connected with the explosion-proof body 1, and the mounting bracket 11 is disposed around the explosion-proof body 1 on a plane parallel to a cross section of the mounting hole, where as shown in fig. 1, 4 and 6, the first end face and one end face of the mounting bracket 11 are located on the same plane, and the second end face protrudes out of the other end face of the mounting bracket 11.
Preferably, the mounting bracket 11 is a rectangular frame, and in order to reduce the weight and improve the strength of the power battery explosion-proof device, the mounting bracket 11 is integrally connected with the explosion-proof body 1 through a plurality of reinforcing ribs 13.
Further, as shown in fig. 1 and 5, in order to facilitate the installation of the power battery explosion-proof device on the power battery casing through the installation bracket, in the embodiment of the invention, a plurality of nested nuts 5 are arranged on the installation bracket 11, and the installation bracket 11 is fixed on the power battery casing through the matching of the nested nuts 5 and bolts arranged on the power battery casing. Preferably, the nesting nuts 5 are provided at each corner of the mounting bracket 11 by an injection molding process.
In order to improve the sealing effect between the mounting bracket 11 and the power battery shell and ensure the protection level of the power battery during daily work, in the embodiment of the invention, a first sealing groove 6 is arranged on the end surface of the mounting bracket 11, which is positioned on the same plane as the first end surface, and a first sealing ring 7 is arranged in the first sealing groove 6. The first sealing ring 7 is a high-temperature silica gel sealing ring, so that the first sealing ring 7 is prevented from being melted due to huge energy generated by a power battery; the mounting bracket 11 and the end face of the first end face located on the same plane are attached to the power battery shell.
As shown in fig. 2 again, in order to further reduce the space occupied by the explosion-proof device for power battery, the explosion-proof body 1 includes two cylinder structures with different inner diameters and same wall thickness, wherein the two cylinder structures are coaxial, a first cylinder structure portion with a smaller inner diameter is inserted into a second cylinder structure with a larger inner diameter, and a plurality of reinforcing connecting ribs are arranged between an outer wall of a portion of the first cylinder structure inserted into the first cylinder structure and an inner wall of the second cylinder structure, so as to realize fixed connection between the first cylinder structure and the second cylinder structure. The end face, far away from the second cylinder structure, of the first cylinder structure is a first end face of the explosion-proof body 1, and the end face, far away from the first cylinder structure, of the second cylinder structure is a second end face of the explosion-proof body 1.
As shown in fig. 2, in order to improve the firmness of the connection between the guide post 15 and the explosion-proof body 1, in the embodiment of the present invention, when the guide post 15 is inserted into the mounting hole, the thimble 8 needs to be inserted into the guide post 15. Therefore, the thimble 8 is of a sheet structure and is coaxial with the explosion-proof body 1. In order to fix the thimble 8 in the mounting hole, in the embodiment of the present invention, the thimble 8 is disposed at a portion of the second cylindrical structure, which is inserted into the first cylindrical structure, and is fixedly connected to an inner wall of the first cylindrical structure through a plurality of symmetrically disposed fixing devices 16, wherein a circular hole coaxial with the first cylindrical structure is formed by the plurality of fixing devices 16, a non-protruding end of the thimble 8 is disposed in the circular hole, and two corners of the non-protruding end are fixedly connected to the inner wall forming the circular hole.
Because the two corners of the thimble 8 are connected to the inner wall of the circular hole formed by the fixing device 16, in order to facilitate the thimble 8 to be inserted into the guide post 15, as shown in fig. 3, in the embodiment of the present invention, an installation groove penetrating through the guide post 15 along the axial direction of the guide post 15 is disposed on the guide post 15, and when the thimble 8 is inserted into the guide post 15, the two sides of the thimble 8 are clamped in the installation groove.
Further, in order that the spring 4 can be in a compressed state when the power battery is in a normal working condition, the power battery explosion-proof device further comprises a nut 17 abutted to the spring 4, wherein the nut 17 is matched with the thread on the outer wall of the guide column 15 to lock the spring 4.
As shown in fig. 3, in order to improve the sealing effect of the moving valve core 3 and ensure the protection level of the power battery during daily work, in the embodiment of the present invention, a second sealing groove 9 is further disposed on the end surface of the moving valve core 3 connected to the guide post 15, a second sealing ring 10 is disposed in the second sealing groove 9, and the second sealing ring 10 is a high temperature resistant silica gel sealing ring.
Further, as shown in fig. 1 and 7, in order to avoid that the rupture disk 2 deforms or ruptures toward the power battery case when the pressure in the mounting hole is greater than the pressure inside the power battery, the power battery explosion-proof apparatus according to the embodiment of the present invention further includes a protection net 18 covering the rupture disk 2, the protection net 18 and the ejector pins 8 are disposed on two opposite sides of the rupture disk 2, wherein the edge of the protection net 18 is provided with a plurality of concave portions, the first end surface is provided with a plurality of convex portions, the convex portions are clamped by the concave portions, and the protection net 18 is fixed at the first end surface.
Of course, in order to solve the problem that energy cannot leak due to the blockage of mesh holes of the protection mesh when the power battery is in the extreme thermal runaway condition in the prior art, in the embodiment of the present invention, a plurality of sector-shaped openings 12 with a large area are provided in the protection mesh 18, preferably, the central angle of each sector-shaped opening is 90 °, and the radius of each sector-shaped opening is located between three-fourths of the radius of the protection mesh 18 and the radius of the protection mesh 18.
Specifically, as shown in fig. 1 and 5, in the embodiment of the present invention, a trademark label 14 is further attached to an end surface of the moving valve core 3 away from the guide post 15, so that a user can intuitively determine a manufacturer of the power battery explosion-proof device.
According to the power battery explosion-proof device provided by the embodiment of the invention, after the energy of the power battery is released, when the environmental pressure in the mounting hole is smaller than the second preset pressure, the spring 4 drives the motion valve core 3 to move towards the direction close to the explosion-proof body 1, so that the mounting hole is sealed by the motion valve core 3 at the second end face, the external air is prevented from entering the power battery, and a longer escape time is provided for passengers; by increasing the area of each opening of the protection net 18, the situation that the power battery cannot leak energy due to blockage of the protection net 18 is avoided.
Another embodiment of the invention provides a power battery, which comprises a power battery shell and the power battery explosion-proof device.
The embodiment of the invention also provides an electric automobile which comprises the power battery.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. An explosion-proof device for a power battery is characterized by comprising:
the explosion-proof body (1) comprises a mounting hole penetrating through a first end face and a second end face, and at least one ejector pin (8) protruding towards the first end face is arranged in the mounting hole;
a rupture disk (2) fixed to the first end face; the rupture disk (2) comprises a second state of sealing the mounting hole when the environmental pressure is less than a first preset pressure, and a first state of deforming towards the inside of the mounting hole and being broken by the thimble (8) when the environmental pressure is greater than or equal to the first preset pressure;
the moving valve core (3) is arranged at the second end face, wherein the moving valve core (3) further comprises a guide post (15) inserted into the mounting hole;
the spring (4) is sleeved on the guide post (15) inserted and extended in the mounting hole;
the ejector pin (8) is of a sheet structure, an installation groove which axially penetrates through the guide post (15) along the guide post (15) is formed in the guide post (15), and the ejector pin (8) is inserted into the guide post (15) and clamped in the installation groove;
the power battery explosion-proof device further comprises a nut (17) abutted against the spring (4), wherein the nut (17) is matched with the thread on the outer wall of the guide column (15) and used for locking the spring (4);
wherein the moving spool (3) is capable of sealing the mounting hole at the second end face into a sealed state when the rupture disk (2) is in the second state; when the rupture disk (2) is in the first state, the moving valve core (3) moves towards the direction away from the explosion-proof body (1) to further compress the spring (4), and the moving valve core (3) forms a gas flow channel at the second end face to form an open state;
when the environmental pressure in the mounting hole is smaller than or equal to a second preset pressure, the spring (4) resets to drive the moving valve core (3) to recover from the opening state to the sealing state; wherein the second preset pressure is less than the first preset pressure.
2. The power battery explosion-proof device according to claim 1, wherein after the rupture disk (2) changes from the second state to the first state, if the ambient pressure in the mounting hole is greater than the second preset pressure, the movable valve core (3) moves in a direction away from the explosion-proof body (1), so that the movable valve core (3) forms a gas flow channel at the second end face, and the gas flow channel is formed in an open state.
3. The power battery explosion-proof device according to claim 1, further comprising a mounting bracket (11) integrally connected to the explosion-proof body (1), wherein the mounting bracket (11) is disposed around the explosion-proof body (1) on a plane parallel to a cross section of the mounting hole, wherein the first end face and one end face of the mounting bracket (11) are located on the same plane, and the second end face protrudes from the other end face of the mounting bracket (11).
4. The explosion-proof device for the power battery according to claim 3 is characterized in that a plurality of nested nuts (5) are arranged on the mounting bracket (11), and the mounting bracket (11) is fixed on the power battery shell through the matching of the nested nuts (5) and bolts arranged on the power battery shell.
5. The explosion-proof device for the power battery according to claim 3, wherein a first sealing groove (6) is formed in an end face of the mounting bracket (11) and the first end face, which are located on the same plane, and a first sealing ring (7) is arranged in the first sealing groove (6).
6. The explosion-proof device for the power battery as recited in claim 1, wherein a second sealing groove (9) is formed in the end face of the movable valve core (3) connected with the guide column (15), and a second sealing ring (10) is arranged in the second sealing groove (9).
7. The power battery explosion-proof device according to claim 1, further comprising a protection net (18) covering the rupture membrane (2), wherein a plurality of concave portions are arranged on the edge of the protection net (18), a plurality of convex portions are arranged on the first end face, the concave portions are clamped on the convex portions, and the protection net (18) is fixed on the first end face.
8. Power battery explosion protection device according to claim 7, characterized in that a plurality of fan-shaped openings (12) are provided on the protective mesh (18).
9. A power cell, comprising: the power battery explosion-proof device of any one of claims 1 to 8, wherein the power battery explosion-proof device is fixed on the power battery housing.
10. An electric vehicle characterized by comprising the power battery according to claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810698807.5A CN108807785B (en) | 2018-06-29 | 2018-06-29 | Power battery explosion-proof device, power battery and electric automobile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810698807.5A CN108807785B (en) | 2018-06-29 | 2018-06-29 | Power battery explosion-proof device, power battery and electric automobile |
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| Publication Number | Publication Date |
|---|---|
| CN108807785A CN108807785A (en) | 2018-11-13 |
| CN108807785B true CN108807785B (en) | 2021-08-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810698807.5A Active CN108807785B (en) | 2018-06-29 | 2018-06-29 | Power battery explosion-proof device, power battery and electric automobile |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109698298A (en) * | 2018-12-27 | 2019-04-30 | 蜂巢能源科技有限公司 | The pressure relief device of battery core |
| CN109904366A (en) * | 2019-03-08 | 2019-06-18 | 合肥聚驰科技有限公司 | It is a kind of to provide the method and battery system of thermal runaway signal by explosion-proof relief valve |
| CN110311079B (en) * | 2019-06-28 | 2022-02-01 | 蜂巢能源科技有限公司 | Explosion-proof breathable membrane assembly for power battery pack and battery pack explosion-proof breathable valve thereof |
| CN111425635B (en) * | 2020-03-31 | 2022-04-05 | 威睿电动汽车技术(宁波)有限公司 | Thermal runaway anti-backfire pressure release valve and electric automobile |
| CN114198543B (en) * | 2020-08-31 | 2023-08-08 | 宁德时代新能源科技股份有限公司 | Bidirectional pressure release valve, battery and electricity utilization device |
| KR20220120002A (en) * | 2021-02-22 | 2022-08-30 | 주식회사 엘지에너지솔루션 | Battery module and battery pack including the same |
| CN115282527A (en) * | 2021-11-12 | 2022-11-04 | 长城汽车股份有限公司 | Fire extinguishing box and battery pack lower box |
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| JPH11224658A (en) * | 1998-02-06 | 1999-08-17 | Fuji Elelctrochem Co Ltd | Current interrupting element and battery having current interrupting element |
| CN201126051Y (en) * | 2008-04-11 | 2008-10-01 | 张永志 | Negative pressure superconduction automatic start and stop discharge exploding apparatus |
| CN201438479U (en) * | 2009-07-28 | 2010-04-14 | 珠海锂源投资有限公司 | Explosion-proof unit for lithium ion batteries |
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| Publication number | Publication date |
|---|---|
| CN108807785A (en) | 2018-11-13 |
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