CN221596532U - Battery monomer, battery and power consumption device - Google Patents

Abstract

The application discloses a battery monomer, a battery and an electricity utilization device. The battery cell includes a case, an electrode assembly, and a first separator. The electrode assembly is arranged in the shell and comprises a main body part and a first tab, wherein the main body part comprises two first surfaces which are oppositely arranged along the thickness direction of the main body part, and the first tab is led out from one end of the main body part along the first direction. The first spacer comprises a first bonding part and a first non-bonding part, at least part of the first bonding part is bonded to the first surface, the projection of the first bonding part in the thickness direction is positioned outside the first tab, the first non-bonding part covers a part of the first tab in the thickness direction, and one end of the first tab, which is far away from the main body part, exceeds the first spacer in the first direction. The first non-bonding portion can effectively isolate the first tab from the shell, so that the risk of lap joint of the first tab and the shell is reduced, the first tab cannot be pulled with the first non-bonding portion when being bent, and the phenomenon of cracking of the first tab is improved.

Description

Battery monomer, battery and power consumption device

Technical Field

The application belongs to the technical field of batteries, and particularly relates to a battery monomer, a battery and an electric device.

Background

With the development of new energy technology, the application of batteries is wider. For example, batteries are widely used not only in energy storage power systems such as hydraulic power, thermal power, wind power and solar power stations, but also in electric vehicles such as electric bicycles, electric motorcycles and electric vehicles, and in various fields such as aerospace.

The development of battery technology is taking into consideration various design factors such as energy density, cycle life, assembly efficiency, processing technology, etc., as well as reliability of the battery.

Disclosure of utility model

The embodiment of the application provides a battery monomer, a battery and an electric device, which can improve the cracking phenomenon of a tab and improve the reliability of the battery monomer.

According to a first aspect of the present application, there is provided a battery cell including a case, an electrode assembly, and a first separator. The electrode assembly is arranged in the shell and comprises a main body part and a first tab, the main body part comprises two first surfaces which are oppositely arranged along the thickness direction of the main body part, the first tab is led out from one end of the main body part along the first direction, and the first direction is intersected with the thickness direction. The first spacer comprises a first bonding part provided with a viscous substance layer and a first non-bonding part not provided with the viscous substance layer, at least part of the first bonding part is bonded to the first surface, the projection of the first bonding part in the thickness direction is positioned outside the first tab, the first non-bonding part covers a part of the first tab in the thickness direction, and one end of the first tab, which is far away from the main body part, exceeds the first spacer in the first direction. According to the embodiment of the application, the first separator with the first bonding part and the first non-bonding part is arranged on the electrode assembly, so that the bonding firmness of the first separator and the first surface can be improved through the first bonding part, and a part of the first tab is covered through the first non-bonding part to effectively isolate the first tab from the shell, so that the risk of overlapping the first tab and the shell is reduced, the projection of the first bonding part in the thickness direction is positioned outside the first tab, the first non-bonding part is not provided with a sticky substance layer, the first tab cannot generate a pulling action with the first non-bonding part in the deformation processes of pressing, rebounding and the like, the tab cracking phenomenon is improved, and the reliability of a battery cell is improved.

In some embodiments, in the second direction, both ends of the first non-adhesive portion extend beyond the first tab, and the first direction, the second direction, and the thickness direction are perpendicular to each other. The first non-bonding part is provided with a certain redundancy amount at two ends of the first tab along the second direction, so that the covering effect of the first non-bonding part on the first tab can be improved, and the bonding possibility with the first bonding part in the deformation process of the first tab is reduced.

In some embodiments, the first non-adhesive portion also covers a portion of the first surface in the thickness direction. Thus, the area of the first non-adhesive portion can be appropriately increased, and the effect of covering the first tab by the first non-adhesive portion can be improved, thereby improving the isolation effect of the first separator.

In some embodiments, the first bonding portion includes two first bonding regions, the two first bonding regions are respectively disposed on two sides of the first non-bonding portion along the second direction, at least part of the first bonding regions is bonded to the first surface, and the first direction, the second direction and the thickness direction are perpendicular to each other. Therefore, not only can the bonding firmness be improved, but also the flatness of the first non-bonding part along the second direction can be improved, so that the first non-bonding part effectively covers part of the first tab, and the protection effect of the first spacer on the first tab in the second direction is improved.

In some embodiments, the number of first spacers is two, and the two first spacers are disposed opposite to each other in the thickness direction; the first bonding area comprises a first sub-area and a second sub-area, the first sub-areas of the two first spacers are bonded to the first surface, and the second sub-areas of the two first spacers are bonded. Therefore, the connection stability between the two first separators and the electrode assembly is improved, the two first separators can be clung to the electrode assembly, and the protection effect of the first separators on the first electrode lugs is further improved.

In some embodiments, the first adhesive region has a dimension in the second direction that is greater than or equal to 5mm. Thereby, the connection stability between the first separator and the electrode assembly can be improved, and the possibility of the first separator falling off can be reduced.

In some embodiments, the first bonding portion includes a second bonding region between the two first bonding regions, the second bonding region being bonded to the first surface. On the one hand, the area of the first bonding part can be increased, so that the bonding strength and the bonding effect are improved; on the other hand, the phenomenon that the first non-bonding part bulges under the influence of the bending of the first tab can be improved, so that the first non-bonding part is smoother in the bending process of the first tab, and the protection effect is improved.

In some embodiments, the second bonding regions extend continuously in the second direction, and two ends of the second bonding regions are connected to the two first bonding regions, respectively. The second bonding area forms a whole with two first bonding areas, and bonding strength is higher, and the connection between first separator and the electrode subassembly is more firm.

In some embodiments, the second bonded region includes a plurality of third sub-regions spaced apart along the second direction, adjacent third sub-regions forming a portion of the first unbonded portion therebetween, and between the third sub-regions and the first bonded region. Gaps are formed between the adjacent third sub-regions and between the third sub-regions and the first bonding region, and form part of the first non-bonding portion through which air bubbles can be discharged at the time of bonding, so that the bonding of the first separator and the electrode assembly is smoother.

In some embodiments, the second bonding regions are disposed between ends of the two first bonding regions facing away from the first tab in the first direction. Therefore, the first bonding part is more attached to the first surface, and the possibility that the first spacer is tilted on the first surface is reduced.

In some embodiments, the number of the first tabs is a plurality, the plurality of first tabs are arranged at intervals along the second direction, and the first direction, the second direction and the thickness direction are perpendicular to each other; the first non-adhesive portion covers a part of each first tab in the thickness direction. Therefore, the protection and isolation effects can be achieved on a plurality of first lugs, only one first isolation piece is needed to be adhered, the assembly process is simplified, and the assembly efficiency is improved.

In some embodiments, the electrode assembly further comprises a second tab, the second tab and the first tab being of opposite polarity, the first tab and the second tab being drawn from the same end of the body portion in the first direction; the projection of the first bonding part in the thickness direction is positioned outside the second lug, and the first non-bonding part covers a part of the first lug and a part of the second lug in the thickness direction, and one end of the second lug away from the main body part exceeds the first separator in the first direction. Therefore, the first tab and the second tab can be protected and isolated, only one first isolating piece is needed to be adhered, the assembly process is simplified, and the assembly efficiency is improved.

In some embodiments, the electrode assembly further comprises a second tab, the second tab and the first tab being opposite in polarity, the first tab and the second tab being respectively led out from opposite ends of the body portion along the first direction; the battery cell further comprises a second separator, the second separator comprises a second bonding part provided with a viscous substance layer and a second non-bonding part not provided with the viscous substance layer, at least part of the second bonding part is bonded to the first surface, the projection of the second bonding part in the thickness direction is positioned outside the second lug, the second non-bonding part covers a part of the second lug in the thickness direction, and in the first direction, one end of the second lug, which is far away from the main body part, exceeds the second separator. Therefore, the sizes of the first separator and the second separator are reduced, defects such as bubbles and wrinkles are not easy to generate in the bonding process, and the bonding effect between the first separator and the electrode assembly and the bonding effect between the second separator and the electrode assembly are improved.

In some embodiments, the first spacer and the second spacer do not overlap. The first separator and the second separator do not affect each other, and the influence of the arrangement of the separators on the thickness of the battery cells is reduced.

In some embodiments, the electrode assembly includes a plurality of first electrode sheets and a plurality of second electrode sheets, the polarity of the first electrode sheets being opposite to the polarity of the second electrode sheets, the plurality of first electrode sheets and the plurality of second electrode sheets being alternately arranged in a thickness direction; the first pole piece comprises a first current collector and a first active material layer coated on the surface of the first current collector, and the second pole piece comprises a second current collector and a second active material layer coated on the surface of the second current collector; the body part includes a portion of the first current collector coated with the first active material layer, a portion of the second current collector coated with the second active material layer, the first active material layer, and the second active material layer, and the first tab includes a portion of the first current collector not coated with the first active material layer.

According to a second aspect of the present application, the present application also provides a battery, which includes a plurality of the battery cells provided in any of the embodiments of the present application.

According to a second aspect of the present application, there is also provided an electrical device comprising a battery according to any of the embodiments of the present application, the battery being for providing electrical energy.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort to a person of ordinary skill in the art.

Fig. 1 is a schematic structural view of a vehicle according to some embodiments of the present application.

Fig. 2 is a schematic exploded view of a battery according to some embodiments of the present application.

Fig. 3 is an exploded view of a battery cell according to some embodiments of the present application.

Fig. 4 is a schematic structural view of an electrode assembly according to some embodiments of the present application.

Fig. 5 is a cross-sectional view taken along direction A-A of fig. 4.

Fig. 6 is a schematic view illustrating a part of a structure of a battery cell according to some embodiments of the present application.

Fig. 7 is a schematic view illustrating a part of a structure of a battery cell according to other embodiments of the present application.

Fig. 8 is a schematic view illustrating a part of a structure of a battery cell according to still other embodiments of the present application.

Fig. 9 is a schematic view illustrating a part of a structure of a battery cell according to still other embodiments of the present application.

In the accompanying drawings:

The vehicle 1000, the battery 100, the controller 200, the motor 300, the case 10, the first portion 11, the second portion 12, the battery cell 20, the case 21a, the cap plate 21b, the electrode assembly 22, the main body portion 221, the first surface 2211, the first tab 222, the second tab 223, the first pole piece 224, the first current collector 2241, the first active material layer 2242, the second tab 225, the second current collector 2251, the second active material layer 2252, the third separator 226, the first separator 23, the first adhesive part 231, the first adhesive region 2311, the first sub-region 2311a, the second sub-region 2311b, the second adhesive region 2312, the third sub-region 2312a, the first non-adhesive part 232, the second separator 24, the second adhesive part 241, the second non-adhesive part 242, the thickness direction X, the first direction Y, and the second direction Z.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description of the application and the claims and the description of the drawings above are intended to cover a non-exclusive inclusion. The terms first, second and the like in the description and in the claims or in the above-described figures, are used for distinguishing between different objects and not necessarily for describing a particular sequential or chronological order.

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "attached" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

The term "and/or" in the present application is merely an association relation describing the association object, and indicates that three kinds of relations may exist, for example, a and/or B may indicate: a exists alone, A and B exist together, and B exists alone. In the present application, the character "/" generally indicates that the front and rear related objects are an or relationship.

In the embodiments of the present application, the same reference numerals denote the same components, and detailed descriptions of the same components are omitted in different embodiments for the sake of brevity. It should be understood that the thickness, length, width, etc. dimensions of the various components in the embodiments of the application shown in the drawings, as well as the overall thickness, length, width, etc. dimensions of the integrated device, are merely illustrative and should not be construed as limiting the application in any way.

The term "plurality" as used herein refers to two or more (including two).

In embodiments of the present application, "parallel" includes not only the case of absolute parallelism, but also the case of substantially parallelism that is conventionally recognized in engineering; meanwhile, "vertical" includes not only the case of absolute vertical but also the case of substantially vertical as conventionally recognized in engineering.

In the embodiment of the application, the battery cell can be a secondary battery cell, and the secondary battery cell refers to a battery cell which can activate the active material in a charging mode to continue to use after the battery cell discharges.

The battery cell generally includes an electrode assembly including a positive electrode tab and a negative electrode tab. During the charge and discharge of the battery cell, active ions (e.g., lithium ions) are inserted and extracted back and forth between the positive electrode and the negative electrode. Illustratively, the electrode assembly further includes a separator disposed between the positive and negative electrode sheets, the separator being operable to prevent shorting of the positive and negative electrode sheets while allowing passage of active ions.

The battery cell may be a lithium ion battery cell, a sodium lithium ion battery cell, a lithium metal battery cell, a sodium metal battery cell, a lithium sulfur battery cell, a magnesium ion battery cell, a nickel hydrogen battery cell, a nickel cadmium battery cell, a lead storage battery cell, etc., which is not limited by the embodiment of the application.

As an example, the battery cell may be a cylindrical battery cell, a prismatic battery cell, or other shaped battery cell, including a square-case battery cell, a blade-shaped battery cell, a polygonal-prismatic battery, such as a hexagonal-prismatic battery, etc., and the present application is not particularly limited.

The battery cells may be hard shell battery cells, soft pack battery cells, or other types of battery cells.

The battery according to the embodiment of the present application refers to a single physical module including a plurality of battery cells to provide higher voltage and capacity. For example, the battery referred to in the present application may include a battery module or a battery pack, or the like. The battery generally includes a case for enclosing one or more battery cells. The case body can prevent liquid or other foreign matters from affecting the charge or discharge of the battery cells.

In some embodiments, the tank may be part of the chassis structure of the vehicle. For example, a portion of the tank may become at least a portion of the floor of the vehicle, or a portion of the tank may become at least a portion of the cross member and the side member of the vehicle.

In some embodiments, the battery may be an energy storage device. The energy storage device comprises an energy storage container, an energy storage electric cabinet and the like.

The battery is typically packaged by a casing after winding or stacking a positive electrode tab, a negative electrode tab, and a separator to form an electrode assembly. And a plurality of tabs which are arranged in a stacked manner are led out from the positive pole piece and the negative pole piece, and the tabs are welded on the adapter of the shell to realize the electric connection with the shell. In the related art, the traditional Z-shaped stacking or the novel continuous stacking is directly glued on the front and back sides of the electrode lugs after ultrasonic welding, and is used for protecting the electrode lugs from being lapped with the shell. However, in the subsequent transferring and production procedures, such as tab folding, tab deformation is easily pulled by glue to cause tab cracking, which affects battery performance.

In view of this, the embodiment of the application provides a technical solution, in which a first separator having a first bonding portion and a first non-bonding portion is disposed on an electrode assembly, so that the bonding firmness between the first separator and a first surface can be improved by the first bonding portion, and a part of the first tab is covered by the first non-bonding portion to effectively isolate the first tab from the housing, thereby reducing the risk of overlapping the first tab with the housing, and the first non-bonding portion has no adhesive material layer, and does not generate a pulling action with the first non-bonding portion in the deformation processes of pressing and bouncing the first tab, so as to improve the cracking phenomenon of the first tab.

The technical scheme provided by the embodiment of the application is suitable for the battery and the vehicle using the battery. The vehicle can be a fuel oil vehicle, a fuel gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or a range-extended vehicle and the like.

Fig. 1 is a schematic structural view of a vehicle according to some embodiments of the present application. Referring to fig. 1, a vehicle 1000 may be a fuel oil vehicle, a gas vehicle, or a new energy vehicle, which may be a pure electric vehicle, a hybrid vehicle, or an extended range vehicle, etc. The battery 100 is provided in the interior of the vehicle 1000, and the battery 100 may be provided at the bottom or the head or the tail of the vehicle 1000. The battery 100 may be used for power supply of the vehicle 1000, for example, the battery 100 may be used as an operating power source of the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, the controller 200 being configured to control the battery 100 to power the motor 300, for example, for operating power requirements during start-up, navigation, and travel of the vehicle 1000.

In some embodiments of the present application, battery 100 may not only serve as an operating power source for vehicle 1000, but may also serve as a driving power source for vehicle 1000, instead of or in part instead of fuel oil or natural gas, to provide driving power for vehicle 1000.

Fig. 2 is a schematic exploded view of a battery according to some embodiments of the present application. Referring to fig. 2, the battery 100 includes a case 10 and a battery cell 20, and the battery cell 20 is accommodated in the case 10. The case 10 is used to provide an accommodating space for the battery cell 20, and the case 10 may have various structures. In some embodiments, the case 10 may include a first portion 11 and a second portion 12, the first portion 11 and the second portion 12 being overlapped with each other, the first portion 11 and the second portion 12 together defining an accommodating space for accommodating the battery cell 20. The second portion 12 may be a hollow structure with one end opened, the first portion 11 may be a plate-shaped structure, and the first portion 11 covers the opening side of the second portion 12, so that the first portion 11 and the second portion 12 together define a containing space; the first portion 11 and the second portion 12 may be hollow structures each having an opening at one side, and the opening side of the first portion 11 is engaged with the opening side of the second portion 12. Of course, the case 10 formed by the first portion 11 and the second portion 12 may be of various shapes, such as a cylinder, a rectangular parallelepiped, or the like.

In the battery 100, the plurality of battery cells 20 may be connected in series, parallel or a series-parallel connection, wherein the series-parallel connection refers to that the plurality of battery cells 20 are connected in series or parallel. The plurality of battery cells 20 can be directly connected in series or in parallel or in series-parallel, and then the whole formed by the plurality of battery cells 20 is accommodated in the box 10; of course, the battery 100 may also be a battery module formed by connecting a plurality of battery cells 20 in series or parallel or series-parallel connection, and a plurality of battery modules are then connected in series or parallel or series-parallel connection to form a whole and are accommodated in the case 10. The battery 100 may further include other structures, for example, the battery 100 may further include a bus member for making electrical connection between the plurality of battery cells 20.

Wherein each battery cell 20 may be a secondary battery or a primary battery; but not limited to, lithium sulfur batteries, sodium ion batteries, or magnesium ion batteries. The battery cell 20 may be in the shape of a cylinder, a flat body, a rectangular parallelepiped, or other shapes, etc.

Fig. 3 is an exploded view of a battery cell according to some embodiments of the present application. Referring to fig. 3, the battery cell 20 includes a case 21 and an electrode assembly 22, and the electrode assembly 22 is disposed within the case 21. The electrode assembly 22 includes a positive electrode and a negative electrode. During charge and discharge of the battery cell 20, active ions (e.g., lithium ions) are inserted and extracted back and forth between the positive electrode and the negative electrode. Optionally, the electrode assembly 22 further includes a third separator disposed between the positive and negative electrodes, which may reduce the risk of shorting the positive and negative electrodes while allowing the passage of active ions.

In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material layer disposed on at least one surface of the positive electrode current collector.

As an example, the positive electrode current collector has two surfaces opposing in its own thickness direction, and the positive electrode active material layer is provided on either one or both of the two surfaces opposing the positive electrode current collector.

As an example, the positive electrode current collector may employ a metal foil or a composite current collector. The composite current collector may include a polymeric material base layer and a metal layer. The composite current collector may be formed by forming a metal material on a polymeric material substrate.

As an example, the positive electrode active material layer includes a positive electrode active material, which may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as a positive electrode active material layer of a battery may be used. These positive electrode active material layers may be used alone or in combination of two or more.

In some embodiments, the positive electrode may be a metal foam. The foam metal can be foam nickel, foam copper, foam aluminum, foam alloy, foam carbon or the like. When the metal foam is used as the positive electrode, the surface of the metal foam may not be provided with the positive electrode active material layer, but may be provided with the positive electrode active material layer. As an example, a lithium source material, which is lithium metal and/or a lithium-rich material, potassium metal or sodium metal, may also be filled and/or deposited within the foam metal.

In some embodiments, the negative electrode may be a negative electrode tab, which may include a negative electrode current collector.

As an example, the negative electrode current collector may employ a metal foil, a foam metal, or a composite current collector. The composite current collector may include a polymeric material base layer and a metal layer. The composite current collector may be formed by forming a metal material on a polymeric material substrate.

As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

As an example, the anode current collector has two surfaces opposing in its own thickness direction, and the anode active material is provided on either or both of the two surfaces opposing the anode current collector.

As an example, a negative active material for a battery cell, which is well known in the art, may be used.

In some embodiments, the material of the positive electrode current collector may be aluminum and the material of the negative electrode current collector may be copper.

In some embodiments, the third separator comprises a separator film. The type of the separator is not particularly limited, and any known porous separator having good chemical stability and mechanical stability can be used.

The separator may be a single-layer film or a multilayer composite film, and is not particularly limited. When the separator is a multilayer composite film, the materials of the respective layers may be the same or different, and are not particularly limited. The separator may be a single member located between the positive and negative electrodes, or may be attached to the surfaces of the positive and negative electrodes.

In some embodiments, the third separator is a solid state electrolyte. The solid electrolyte is arranged between the anode and the cathode and plays roles in transmitting ions and isolating the anode and the cathode.

The case 21 has a hollow structure, and an accommodating space for accommodating the electrode assembly 22 and the electrolyte is formed therein. The shape of the case 21 may be determined according to the specific shape of the electrode assembly 22. For example, if the electrode assembly 22 has a rectangular parallelepiped structure, a rectangular parallelepiped housing may be selected.

The material of the housing 21 may be various, for example, the material of the housing 21 may be metal or plastic. Alternatively, the material of the housing 21 may be copper, iron, aluminum, steel, aluminum alloy, or the like. Illustratively, the housing 21 may be a steel housing, an aluminum housing, a plastic housing (e.g., polypropylene), a composite metal housing (e.g., a copper aluminum composite housing), an aluminum plastic film, or the like.

As an example, the housing 21 includes a case 21a having an opening and a cover 21b for covering the opening, the cover 21 b.

The case 21a is a member for cooperating with the cap plate 21b to form an internal cavity of the battery cell 20, which may be used to accommodate the electrode assembly 22, electrolyte, and other components.

The housing 21a and the cover 21b may be separate components. For example, an opening may be provided in the case 21a, and the cover 21b may be closed at the opening to form an internal cavity of the battery cell 20.

The shape of the cover plate 21b may be adapted to the shape of the housing 21a to fit the housing 21a. The material of the cover 21b may be the same as or different from that of the case 21a.

The cover 21b may be welded, glued, snapped or otherwise attached to the housing 21a.

In some embodiments, referring to fig. 3, the battery cell 20 includes a case 21, an electrode assembly 22, and a first separator 23, the electrode assembly 22 being disposed within the case 21.

Fig. 4 is a schematic structural view of an electrode assembly according to some embodiments of the present application, fig. 5 is a cross-sectional view of fig. 4 taken along the direction A-A, fig. 6 is a schematic structural view of a portion of a battery cell according to some embodiments of the present application, fig. 7 is a schematic structural view of a portion of a battery cell according to other embodiments of the present application, and fig. 8 is a schematic structural view of a portion of a battery cell according to still other embodiments of the present application.

Referring to fig. 3 to 8, the electrode assembly 22 includes a main body 221 and a first tab 222, the main body 221 includes two first surfaces 2211 disposed opposite to each other in a thickness direction X thereof, the first tab 222 is led out from one end of the main body 221 in a first direction Y, and the first direction Y intersects the thickness direction X. The first separator 23 includes a first adhesive portion 231 provided with an adhesive substance layer and a first non-adhesive portion 232 provided without an adhesive substance layer, at least part of the first adhesive portion 231 is adhered to the first surface 2211, a projection of the first adhesive portion 231 in the thickness direction X is located outside the first tab 222, the first non-adhesive portion 232 covers a portion of the first tab 222 in the thickness direction X, and an end of the first tab 222 remote from the main body 221 in the first direction Y exceeds the first separator 23.

The electrode assembly 22 is a component in which electrochemical reactions occur in the battery cell 20. One or more electrode assemblies 22 may be contained within the housing 21. Electrode assembly 22 may be a wound structure, a laminated structure, a wound laminated composite structure, or other structure.

The electrode assembly 22 may have a cylindrical shape, a flat shape, a polygonal column shape, or the like.

As an example, the electrode assembly 22 includes a plurality of first electrode sheets 224 and a plurality of second electrode sheets 225, the polarity of the first electrode sheets 224 being opposite to the polarity of the second electrode sheets 225, the plurality of first electrode sheets 224 and the plurality of second electrode sheets 225 being alternately arranged in the thickness direction X.

The first electrode tab 224 includes a first current collector 2241 and a first active material layer 2242 coated on a surface of the first current collector 2241, and the second electrode tab 225 includes a second current collector 2251 and a second active material layer 2252 coated on a surface of the second current collector 2251. The body part 221 includes a portion of the first current collector 2241 coated with the first active material layer 2242, a portion of the second current collector 2251 coated with the second active material layer 2252, the first active material layer 2242, and the second active material layer 2252, and the first tab 222 includes a portion of the first current collector 2241 not coated with the first active material layer 2242.

One of the first and second electrode sheets 224 and 225 is a positive electrode sheet, and the other is a negative electrode sheet.

The electrode assembly 22 may further include a third separator 226, the third separator 226 for insulating the first and second electrode sheets 224 and 225.

It is understood that after the plurality of first electrode tabs 224 and the plurality of second electrode tabs 225 are alternately arranged in the thickness direction X, portions of the plurality of first current collectors 2241 where the first active material layers 2242 are not coated may be welded together to form at least one first tab 222 having a multi-layered structure.

The first separator 23 may be an insulating member capable of effectively insulating the first tab 222 from the housing 21.

The first spacer 23 may be an insulating glue layer, for example, blue glue, for example.

The first adhesive part 231 is provided with an adhesive substance layer having an adhesive property and capable of being adhered to other members. The first non-adhesive portion 232 is not provided with an adhesive substance layer, is not adhesive, and does not adhere to other members.

The first bonding portion 231 may be integrally bonded to the first surface 2211, or a part of the first bonding portion 231 may be bonded to the first surface 2211.

The end of the first tab 222 remote from the main body 221 in the first direction Y exceeds the first separator 23, that is, the first non-adhesive portion 232 does not cover the end of the first tab 222 remote from the main body 221 in the thickness direction X, so that the first tab 222 is electrically connected with the electrode terminal on the case 21 at the end thereof remote from the main body 221.

In the thickness direction X, a part of the first tab 222 is covered with the first non-adhesive portion 232, and the first non-adhesive portion 232 acts to isolate a part of the first tab 222 only in the thickness direction X, and there is no adhesive relationship between the first non-adhesive portion 232 and the first tab 222.

The size of the portion of the first tab 222 covered by the first non-adhesive portion 232 along the first direction Y is greater than the size of the portion of the first tab 222 not covered by the first non-adhesive portion 232 along the first direction Y, so as to increase the area of the portion of the first tab 222 covered by the first non-adhesive portion 232 as much as possible, thereby improving the isolation effect.

Illustratively, the portion of the first tab 222 that is covered by the first non-adhesive portion 232 may be on a side of the portion that is not covered by the first non-adhesive portion 232 that is proximate to the main body portion 221.

The battery unit 20 provided by the embodiment of the application is provided with the first separator 23 comprising the first bonding part 231 and the first non-bonding part 232, and at least part of the first bonding part 231 is bonded to the first surface 2211 of the main body part 221, so that the bonding firmness between the first separator 23 and the first surface 2211 can be improved. The first non-bonding portion 232 covers a part of the first tab 222 in the thickness direction X, and the first non-bonding portion 232 can effectively isolate the first tab 222 from the housing 21, so that the risk of overlapping the first tab 222 and the housing 21 is reduced, the first non-bonding portion 232 is not sticky, a pulling action is not generated between the first tab 222 and the first non-bonding portion 232 in the deformation process of the first tab 222, the cracking phenomenon of the first tab 222 is improved, and the reliability of the battery cell is improved.

In some embodiments, in the second direction Z, both ends of the first non-adhesive portion 232 extend beyond the first tab 222, and the first direction Y, the second direction Z, and the thickness direction X are perpendicular to each other.

In other words, in the second direction Z, both ends of the first non-adhesive portion 232 along the second direction Z extend out of the first tab 222. The first non-bonding portion 232 is provided with a certain redundancy at two ends of the first tab 222 along the second direction Z, so that the covering effect of the first non-bonding portion 232 on the first tab 222 can be improved, and the possibility of bonding with the first bonding portion 231 in the deformation process of the first tab 222 can be reduced.

In some embodiments, the first non-adhesive portion 232 also covers a portion of the first surface 2211 in the thickness direction X. Thus, the area of the first non-adhesive portion 232 can be appropriately increased, and the effect of covering the first tab 222 with the first non-adhesive portion 232 can be improved, thereby improving the isolation effect of the first separator 23.

Alternatively, a portion of the first non-adhesive portion 232 in the first direction Y covers a portion of the first tab 222 in the thickness direction X, and another portion of the first non-adhesive portion 232 in the first direction Y covers a portion of the first surface 2211 in the thickness direction X.

In some embodiments, the first bonding portion 231 includes two first bonding regions 2311, the two first bonding regions 2311 are disposed on two sides of the first non-bonding portion 232 along the second direction Z, at least part of the first bonding regions 2311 are bonded to the first surface 2211, and the first direction Y, the second direction Z and the thickness direction X are perpendicular to each other.

The first adhesive area 2311 may have any shape, and may have a regular shape or an irregular shape. Alternatively, the first adhesive area 2311 may have a strip-shaped structure extending along the first direction Y to reduce the size of the first adhesive area 2311 in the second direction Z, thereby saving materials.

The first adhesive 2311 may be a continuous integral area or may include a plurality of discrete sub-areas.

The structures of the two first adhesive regions 2311 may be the same or different. Alternatively, the two first adhesive regions 2311 may be symmetrically disposed along the second direction Z.

Alternatively, the first adhesive region 2311 may be entirely adhered to the first surface 2211. Illustratively, the projection of the first adhesive 2311 in a reference plane perpendicular to the thickness direction X falls entirely within the projection of the first adhesive 2311 in the reference plane.

Alternatively, only a portion of first adhesive region 2311 is adhered to first surface 2211. Illustratively, in the second direction Z, an end of the first adhesive area 2311 extends beyond the main body 221, a portion of the first adhesive area 2311 extending beyond the main body 221 may be adhered to other components, and a portion of the first adhesive area 2311 not extending beyond the main body 221 may be adhered to the first surface 2211.

According to the embodiment of the application, the first bonding areas 2311 are respectively arranged at two sides of the first non-bonding part 232 along the second direction Z, so that not only can the bonding firmness between the first bonding part 231 and the first surface 2211 be improved, but also the flatness of the first non-bonding part 232 along the second direction Z can be improved, thereby effectively covering a part of the first tab 222 by the first non-bonding part 232, and improving the protection effect of the first spacer 23 on the first tab 222 in the second direction Z.

In some embodiments, the number of the first spacers 23 is at least two, and at least two first spacers 23 are disposed two by two in the thickness direction X. The first adhesive region 2311 includes a first sub-region 2311a and a second sub-region 2311b, the first sub-region 2311a being adhered to the first surface 2211, and the second sub-regions 2311b of the two first spacers 23 disposed opposite to each other in the thickness direction X being adhered.

The first sub-region 2311a may be a portion of the first adhesive region 2311 protruding from the main body 221 in the first direction Y, and the second sub-region 2311b may be a portion of the first adhesive region 2311 overlapping the main body 221 in the thickness direction X.

The two first spacers 23 opposing in the thickness direction X may be symmetrically disposed in the thickness direction X.

The number of the first spacers 23 may be two, or may be four, six, or more. It is understood that the number of the first spacers 23 is an even number.

The two first spacers 23 disposed opposite to each other in the thickness direction X can protect the first tab 222 on both sides of the first tab 222, further reducing the possibility of the first tab 222 overlapping the housing 21.

The second sub-areas 2311b of the two first separators 23, which are oppositely disposed along the thickness direction X, are bonded, so that not only the connection stability between the two first separators 23 and the electrode assembly 22 is improved, but also the two first separators 23 can be tightly attached to the electrode assembly 22, and in the second direction Z, the portions of the first tabs 222 covered by the first non-bonding portions 232 are blocked by the second sub-areas 2311b of the two first separators 23 along the two sides of the second direction Z, so that the protection effect of the first separators 23 on the first tabs 222 is further improved.

In some embodiments, the dimension d of the first adhesive area 2311 along the second direction Z is greater than or equal to 5mm.

Too small a dimension d of the first adhesive area 2311 along the second direction Z may affect the adhesive strength and the firmness of the first adhesive area 2311 and the first surface 2211. For this reason, the embodiment of the present application sets the dimension d of the first adhesive region 2311 in the second direction Z to be greater than or equal to 5mm, which can improve the connection stability between the first separator 23 and the electrode assembly 22 and reduce the possibility of the first separator 23 falling off.

It will be appreciated that the dimension of the first adhesive 2311 in the second direction Z is not too large to save material and improve the flatness of the first separator 23. The size of the first adhesive region 2311 in the second direction Z may be appropriately selected according to the size of the electrode assembly 22 in the second direction Z on the basis of securing the coupling strength. For example, the larger the size of the electrode assembly 22 in the second direction Z, the larger the size of the first adhesive region 2311 in the second direction Z.

In some embodiments, the first adhesive 231 includes a second adhesive 2312 between the two first adhesive 2311, the second adhesive 2312 being adhered to the first surface 2211.

The second adhesive region 2312 may be located at any position between the two first adhesive regions 2311 in the second direction Z as long as it can be adhered to the first surface 2211.

In the first direction Y, the second adhesive region 2312 is spaced apart from the first tab 222, and at least a portion of the first non-adhesive portion 232 is between the second adhesive region 2312 and the first tab 222 to be adhered to the first surface 2211.

The second adhesive area 2312 may have any shape, and may have a regular shape or an irregular shape.

The second adhesive 2312 may be a continuous integral area or may include a plurality of discrete sub-areas.

The structure of the second adhesive 2312 may be the same as or different from that of the first adhesive 2311.

The inventor has recognized that when the first tab 222 is bent, the first non-adhesive portion 232 between the two first adhesive regions 2311 may bulge and deform, thereby affecting the adhesive effect between the first adhesive regions 2311 and the first surface 2211.

For this reason, in the embodiment of the present application, the second bonding area 2312 is disposed between the two first bonding areas 2311, and on one hand, the second bonding area 2312 can increase the area of the first bonding portion 231, thereby improving the bonding strength and the bonding effect; on the other hand, the phenomenon that the first non-bonding portion 232 bulges due to the bending influence of the first tab 222 can be improved, so that the first non-bonding portion 232 is smoother in the bending process of the first tab 222, and the protection effect is improved.

In some embodiments, the second adhesive area 2312 extends continuously along the second direction Z, and two ends of the second adhesive area 2312 are respectively connected to the two first adhesive areas 2311.

In the first direction Y, the second adhesive region 2312 is spaced apart from the first tab 222, and at least a portion of the first non-adhesive portion 232 is formed between the second tab 223 and the first tab 222.

Alternatively, the first adhesive 2311 extends in the first direction Y, the second adhesive 2312 extends in the second direction Z, and the second adhesive 2312 and the two first adhesive 2311 are connected to form a substantially U-shaped structure.

The second adhesive area 2312 has a size in the first direction Y of 5mm or more.

The size of the second adhesive area 2312 in the first direction Y may be the same as the size of the first adhesive area 2311 in the second direction Z.

The second adhesive region 2312 is integrally formed with the two first adhesive regions 2311, and has higher adhesive strength, and the connection between the first separator 23 and the electrode assembly 22 is more stable.

As shown in connection with fig. 8, in some embodiments, the second adhesive region 2312 includes a plurality of third sub-regions 2312a spaced apart along the second direction Z, and a portion of the first non-adhesive portion 232 is formed between adjacent third sub-regions 2312a and between the third sub-regions 2312a and the first adhesive region 2311.

The third sub-area 2312a may have any shape, and may have a regular shape or an irregular shape. Illustratively, the third sub-region 2312a may be square, circular, etc.

The inventors have recognized that when the first separator 23 is bonded to the electrode assembly 22, there may be bubbles that cause poor bonding. To this end, the embodiment of the present application provides the second bonding region 2312 to include a plurality of third sub-regions 2312a spaced apart, gaps are formed between adjacent third sub-regions 2312a and between the third sub-regions 2312a and the first bonding region 2311, and the gaps form a part of the first non-bonding part 232 through which bubbles can be discharged at the time of bonding, so that the bonding of the first separator 23 and the electrode assembly 22 is smoother.

In some embodiments, the second adhesive region 2312 is disposed between ends of the two first adhesive regions 2311 facing away from the first tab 222 along the first direction Y.

Both ends of the second adhesive region 2312 along the second direction Z may be respectively connected to ends of the two first adhesive regions 2311 along the first direction Y facing away from the first tab 222. The two ends of the second adhesive area 2312 along the second direction Z may also be spaced apart from the ends of the two first adhesive areas 2311 along the first direction Y facing away from the first tab 222.

In the embodiment of the application, the second bonding areas 2312 are disposed between the ends of the two first bonding areas 2311 facing away from the first tab 222 along the first direction Y, so that the first bonding portions 231 are more adhered to the first surface 2211, and the possibility that the first spacers 23 tilt on the first surface 2211 is reduced.

In some embodiments, the number of the first tabs 222 is plural, and the first tabs 222 are disposed at intervals along the second direction Z, and the first direction Y, the second direction Z and the thickness direction X are perpendicular to each other. The first non-adhesive portion 232 of the first separator 23 covers a part of each first tab 222 in the thickness direction X.

A gap is formed between adjacent first tabs 222, and the first separator 23 also covers a part of the gap between adjacent first tabs 222 in the thickness direction X. Illustratively, the first non-adhesive portion 232 of the first separator 23 covers a portion of the gap between adjacent first tabs 222. Of course, as another example, the first adhesive 231 may cover a part of the gap between the adjacent first tabs 222.

The first non-adhesive portions 232 of the first separator 23 extend beyond the two first tabs 222 at the ends in the second direction Z, respectively, at both ends in the second direction Z.

In the case where a plurality of first tabs 222 are drawn out at the same end of the main body 221, the plurality of first tabs 222 are generally closer to each other. In this case, in the embodiment of the present application, a part of the plurality of first tabs 222 is covered by one first spacer 23, which can play a role in protecting and isolating the plurality of first tabs 222, and only one first spacer 23 needs to be adhered, so that the assembly process is simplified, and the assembly efficiency is improved.

Fig. 9 is a schematic view illustrating a part of a structure of a battery cell according to still other embodiments of the present application. In some embodiments, referring to fig. 9, the electrode assembly 22 further includes a second tab 223, the polarities of the second tab 223 and the first tab 222 are opposite, and the first tab 222 and the second tab 223 are led out from the same end of the main body portion 221 along the first direction Y. The projection of the first adhesive portion 231 in the thickness direction X is located outside the second tab 223, and in the thickness direction X, the first non-adhesive portion 232 of the first spacer 23 covers a portion of the first tab 222 and a portion of the second tab 223, and in the first direction Y, an end of the second tab 223 remote from the main body portion 221 exceeds the first spacer 23.

A gap is formed between the first tab 222 and the second tab 223, and the first spacer 23 also covers a part of the gap between the first tab 222 and the second tab 223 in the thickness direction X. Illustratively, the first non-adhesive portion 232 of the first separator 23 covers a portion of the gap between the first tab 222 and the second tab 223. Of course, as another example, the first adhesive 231 may cover a part of the gap between the first tab 222 and the second tab 223.

Both ends of the first non-adhesive portion 232 of the first separator 23 in the second direction Z protrude beyond the first tab 222 and the second tab 223, respectively.

According to the embodiment of the application, the first separator 23 is used for covering a part of the first lug 222 and the second lug 223 led out from the same end of the main body 221, so that the first lug 222 and the second lug 223 can be protected and isolated, only one first separator 23 is required to be adhered, the assembly process is simplified, and the assembly efficiency is improved.

In some embodiments, referring to fig. 6 to 8, the electrode assembly 22 further includes a second tab 223, the polarities of the second tab 223 and the first tab 222 are opposite, and the first tab 222 and the second tab 223 are respectively led out from opposite ends of the main body 221 in the first direction Y. The battery cell 20 further includes a second separator 24, the second separator 24 including a second adhesive portion 241 provided with an adhesive substance layer and a second non-adhesive portion 242 provided without the adhesive substance layer, at least a portion of the second adhesive portion 241 being adhered to the first surface 2211, a projection of the second adhesive portion 241 in the thickness direction X being located outside the second tab 223, the second non-adhesive portion 242 covering a portion of the second tab 223 in the thickness direction X, the second separator 24 being beyond an end of the second tab 223 remote from the main body portion 221 in the first direction Y.

Alternatively, the second spacer 24 has the same structure as the first spacer 23, and the second bonding portion 241 includes two third bonding regions 2411 and a fourth bonding region 2412 between the two third bonding regions 2411, where the two third bonding regions 2411 are disposed on two sides of the second non-bonding portion 242 along the second direction Z, respectively, and the like, which will not be described herein.

Alternatively, the structure of the second separator 24 may be slightly different from that of the first separator 23. For example, the first adhesive portion 231 and the second adhesive portion 241 may be different in shape, size, etc., and the first non-adhesive portion 232 and the second non-adhesive portion 242 may be different in shape, size, etc.

Alternatively, the first separator 23 and the second separator 24 are symmetrically disposed along the first direction Y.

The second non-bonding portion 242 covers a part of the second lug 223 in the thickness direction X, the second non-bonding portion 242 can effectively isolate the second lug 223 from the housing 21, so that the risk of lap joint between the second lug 223 and the housing 21 is reduced, the projection of the second bonding portion 241 in the thickness direction X is positioned outside the second lug 223, the second non-bonding portion 242 is not sticky, the second lug 223 cannot be pulled by the second non-bonding portion 242 in the deformation process of the second lug 223, the cracking phenomenon of the second lug 223 is improved, and the reliability of the battery cell is improved.

In the embodiment of the application, the first tab 222 and the second tab 223 led out from different ends of the main body 221 are respectively isolated and protected by the first separator 23 and the second separator 24, compared with the case of using the same separator, the size of the first separator 23 and the second separator 24 is reduced, the defects of bubbles, wrinkles and the like are not easy to generate in the bonding process, and the bonding effect between the first separator 23 and the second separator 24 and the electrode assembly 22 is improved.

In some embodiments, the first spacer 23 and the second spacer 24 do not overlap.

Alternatively, the first spacers 23 and the second spacers 24 are disposed at intervals along the first direction Y.

The projections of the first spacer 23 and the second spacer 24 in the plane perpendicular to the thickness direction X do not overlap. The first separator 23 and the second separator 24 do not affect each other, and the influence of the arrangement of the separators on the thickness of the battery cell 20 is reduced.

According to a second aspect of the present application, an embodiment of the present application further provides a battery including a plurality of the battery cells 20 provided in any of the above embodiments.

According to a third aspect of the present application, an embodiment of the present application further provides an electrical device, including the battery provided in any one of the above embodiments, where the battery is used to provide electrical energy. The electrical device may be any of the aforementioned devices or systems that employ a battery cell.

The embodiment of the present application provides a battery cell 20 including a case 21, an electrode assembly 22, and a first separator 23. The electrode assembly 22 is disposed in the case 21 and includes a main body 221 and a first tab 222, the main body 221 including two first surfaces 2211 disposed opposite to each other in a thickness direction X thereof, the first tab 222 being led out from one end of the main body 221 in a first direction Y, the first direction Y intersecting the thickness direction X. The first separator 23 includes a first bonded portion 231 provided with an adhesive substance layer and a first non-bonded portion 232 not provided with an adhesive substance layer. The first adhesive portion 231 includes two first adhesive regions 2311 and a second adhesive region 2312 located between the two first adhesive regions 2311. The two first adhesive regions 2311 are respectively disposed on two sides of the first non-adhesive portion 232 along the second direction Z. A portion of the first adhesive 2311 and the second adhesive 2312 are adhered to the first surface 2211. In the thickness direction X, the first non-adhesive portion 232 covers a portion of the first tab 222 and a portion of the first surface 2211. In the first direction Y, an end of the first tab 222 remote from the main body 221 exceeds the first separator 23. In the second direction Z, both ends of the first non-adhesive portion 232 extend beyond the first tab 222, and the first direction Y, the second direction Z and the thickness direction X are perpendicular to each other.

Alternatively, the second adhesive areas 2312 continuously extend in the second direction Z, and both ends of the second adhesive areas 2312 are respectively connected to the two first adhesive areas 2311.

Optionally, the second adhesive region 2312 includes a plurality of third sub-regions 2312a spaced apart along the second direction Z, and a portion of the first non-adhesive portion 232 is formed between adjacent third sub-regions 2312a and between the third sub-regions 2312a and the first adhesive region 2311.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application, and are intended to be included within the scope of the appended claims and description. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims (17)

1. A battery cell, comprising:

A housing;

The electrode assembly is arranged in the shell and comprises a main body part and a first tab, wherein the main body part comprises two first surfaces which are oppositely arranged along the thickness direction of the main body part, the first tab is led out from one end of the main body part along the first direction, and the first direction is intersected with the thickness direction; and

The first spacer comprises a first bonding part provided with a viscous substance layer and a first non-bonding part not provided with the viscous substance layer, at least part of the first bonding part is bonded to the first surface, the projection of the first bonding part in the thickness direction is positioned outside the first tab, the first non-bonding part covers a part of the first tab in the thickness direction, and one end of the first tab, which is far away from the main body part, exceeds the first spacer in the first direction.

2. The battery cell of claim 1, wherein the battery cell comprises a plurality of cells,

In the second direction, both ends of the first non-bonding part exceed the first tab, and the first direction, the second direction and the thickness direction are perpendicular to each other.

3. The battery cell of claim 1, wherein the battery cell comprises a plurality of cells,

In the thickness direction, the first non-adhesive portion also covers a portion of the first surface.

4. The battery cell of claim 1, wherein the battery cell comprises a plurality of cells,

The first bonding part comprises two first bonding areas, the two first bonding areas are respectively arranged on two sides of the first non-bonding part along the second direction, at least part of the first bonding areas are bonded on the first surface, and the first direction, the second direction and the thickness direction are perpendicular to each other.

5. The battery cell of claim 4, wherein the battery cell comprises a plurality of cells,

The number of the first spacers is two, and the two first spacers are oppositely arranged along the thickness direction;

The first bonding area comprises a first subarea and a second subarea, the first subareas of the two first spacers are bonded to the first surface, and the second subareas of the two first spacers are bonded.

6. The battery cell of claim 4, wherein the battery cell comprises a plurality of cells,

The first bonding region has a dimension along the second direction of greater than or equal to 5mm.

7. The battery cell of claim 4, wherein the battery cell comprises a plurality of cells,

The first bonding part comprises a second bonding area positioned between the two first bonding areas, and the second bonding area is bonded to the first surface.

8. The battery cell of claim 7, wherein the battery cell comprises a plurality of cells,

The second bonding areas continuously extend along the second direction, and two ends of the second bonding areas are respectively connected with the two first bonding areas.

9. The battery cell of claim 7, wherein the battery cell comprises a plurality of cells,

The second bonding region includes a plurality of third sub-regions spaced apart along the second direction, and a portion of the first non-bonding portion is formed between adjacent third sub-regions and between the third sub-regions and the first bonding region.

10. The battery cell of claim 7, wherein the battery cell comprises a plurality of cells,

The second bonding areas are arranged between the two end parts of the first bonding areas, which deviate from the first tab along the first direction.

11. The battery cell of claim 1, wherein the battery cell comprises a plurality of cells,

The number of the first tabs is multiple, the first tabs are arranged at intervals along the second direction, and the first direction, the second direction and the thickness direction are perpendicular to each other;

In the thickness direction, the first non-adhesive portion covers a portion of each of the first tabs.

12. The battery cell of claim 1, wherein the battery cell comprises a plurality of cells,

The electrode assembly further comprises a second tab, the polarities of the second tab and the first tab are opposite, and the first tab and the second tab are led out from the same end part of the main body part along the first direction;

The projection of the first bonding part in the thickness direction is positioned outside the second lug, the first non-bonding part covers a part of the first lug and a part of the second lug in the thickness direction, and one end of the second lug far away from the main body part exceeds the first separator in the first direction.

13. The battery cell of claim 1, wherein the battery cell comprises a plurality of cells,

The electrode assembly further comprises a second tab, the polarities of the second tab and the first tab are opposite, and the first tab and the second tab are led out from two opposite ends of the main body part along the first direction respectively;

The battery cell also comprises a second separator, the second separator comprises a second bonding part provided with a viscous substance layer and a second non-bonding part not provided with the viscous substance layer, at least part of the second bonding part is bonded to the first surface, the projection of the second bonding part in the thickness direction is positioned outside the second lug, the second non-bonding part covers a part of the second lug in the thickness direction, and the second lug is far away from the second separator beyond one end of the main body part in the first direction.

14. The battery cell of claim 13, wherein the battery cell comprises a plurality of cells,

The first and second spacers do not overlap.

15. The battery cell of claim 1, wherein the battery cell comprises a plurality of cells,

The electrode assembly comprises a plurality of first pole pieces and a plurality of second pole pieces, wherein the polarity of the first pole pieces is opposite to that of the second pole pieces, and the plurality of first pole pieces and the plurality of second pole pieces are alternately arranged along the thickness direction;

The first pole piece comprises a first current collector and a first active material layer coated on the surface of the first current collector, and the second pole piece comprises a second current collector and a second active material layer coated on the surface of the second current collector;

The body part includes a portion of the first current collector coated with the first active material layer, a portion of the second current collector coated with the second active material layer, the first active material layer, and the second active material layer, and the first tab includes a portion of the first current collector not coated with the first active material layer.

16. A battery comprising a plurality of cells according to any one of claims 1-15.

17. An electrical device comprising a battery according to claim 16 for providing electrical energy.