CN112909376A

CN112909376A - Battery core and battery monomer

Info

Publication number: CN112909376A
Application number: CN202110316428.7A
Authority: CN
Inventors: 王洪伟; 陈超; 吕豪杰; 刘祥哲
Original assignee: Kunshan Bao Innovative Energy Technology Co Ltd
Current assignee: Kunshan Bao Innovative Energy Technology Co Ltd
Priority date: 2021-03-24
Filing date: 2021-03-24
Publication date: 2021-06-04

Abstract

The application provides an electricity core and battery monomer belongs to battery technical field. The battery cell comprises a plurality of electrode assemblies and at least one first heat conducting fin. A plurality of electrode assemblies are stacked in a first predetermined direction, the electrode assemblies having a separation film. The first heat conduction sheet is arranged between two adjacent electrode assemblies in a first preset direction. The first heat conducting sheet comprises a first heat conducting layer and first connecting layers arranged on two sides of the first heat conducting layer in a first preset direction, and the first connecting layers are in thermal compound connection with isolating films of electrode assemblies adjacent to the first connecting layers. The battery cell with the battery core further comprises a shell, and the battery core is accommodated in the shell. The battery monomer adopting the structure has good heat dissipation performance, so that the battery monomer can be prevented from influencing the use of the battery monomer due to heat generation during working, the performance of the battery monomer is poor, the possibility of breakage and explosion of the battery monomer due to high temperature can be prevented, and the potential safety hazard of the battery monomer is eliminated.

Description

Battery core and battery monomer

Technical Field

The application relates to the technical field of batteries, in particular to an electric core and a battery monomer.

Background

With the rapid development of new energy automobiles in recent years, the application of lithium batteries is more and more extensive. The lithium battery is a secondary battery which works by means of migration of lithium ions between a positive electrode and a negative electrode, has high energy density, and is a secondary battery with large capacity and high efficiency. However, as the requirements of consumers on the capacity and the charging time of the lithium battery are higher and higher, the thickness and the charging rate of the battery cell are larger and larger, and the temperature rise problem is inevitable. The heating problem of the battery monomer during working can influence the use of the battery monomer, the active interface of the electrode is reduced and accelerated due to higher temperature, and the reliability of the battery monomer is poor. In addition, the electrolyte in the single battery is mostly the electrolyte of an organic solvent system, the organic solvent can be decomposed to generate gas in a high-temperature environment, and the generated bad gas is continuously accumulated in the shell of the single battery, so that the performance of the single battery is reduced, the single battery can be bulged, even the single battery can be broken and exploded, and great potential safety hazards exist.

Disclosure of Invention

The embodiment of the application provides an electric core and a single battery, so that the problem that the existing single battery has poor heat dissipation performance and potential safety hazards is solved.

In a first aspect, an embodiment of the present application provides a battery cell, including a plurality of electrode assemblies and at least one first thermally conductive sheet; a plurality of the electrode assemblies are stacked in a first preset direction, the electrode assemblies are provided with separation films, and the separation films comprise connecting parts positioned on two sides of the electrode assemblies in the first preset direction; the first heat conducting sheet is arranged between two adjacent electrode assemblies in the first preset direction; the first heat conducting sheet comprises a first heat conducting layer and first connecting layers arranged on two sides of the first heat conducting layer in the first preset direction, and the first connecting layers are in thermal compound connection with the connecting parts of the electrode assemblies adjacent to the first connecting layers.

In the technical scheme, the battery cell is provided with the plurality of electrode assemblies, the first heat conducting fin is arranged between the two adjacent electrode assemblies, so that the heat conducting capacity of the first heat conducting fin is utilized to provide a heat conducting high-speed channel from the inside of the battery cell, heat between the electrode assemblies is led out when the battery cell works, the temperature rise of the battery cell caused by the gathering of heat between the electrode assemblies is avoided, the heat dissipation performance of the battery cell is further improved, the performance reduction of the battery cell is prevented, and potential safety hazards of the battery cell caused by the temperature rise are eliminated. In addition, the isolating membrane comprises connecting parts which are positioned at two sides of the electrode assembly in the first preset direction, namely, at least part of the isolating membrane is positioned at two sides of the electrode assembly in the first preset direction, the first heat conducting layer of the first heat conducting sheet is respectively provided with a first connecting layer at two sides of the first preset direction, the first heat conducting sheet is in thermal compound connection with the connecting part of the isolating membrane of the adjacent electrode assembly through the first connecting layer, so that the first connecting layer is in thermal compound connection with the isolating membrane positioned at one side of the electrode assembly to realize that the first heat conducting sheet is fixed between the two adjacent electrode assemblies, the battery cell adopting the structure avoids arranging other parts to fix the first heat conducting sheet while improving the heat dissipation performance, thereby simplifying the production steps, reducing the weight and the production cost of the battery cell, and is in thermal compound connection with the adjacent electrode assembly through the first connecting layer of the first heat conducting sheet, so as to reduce the thickness of the battery cell, save the occupied space of the battery cell and further be favorable for improving the capacity of the battery cell.

In addition, the battery cell provided by the embodiment of the application also has the following additional technical characteristics:

in some embodiments, the electrode assembly includes a plurality of pole pieces arranged in a stack along the first preset direction; the first heat-conducting fin is perpendicular to the first preset direction.

In the technical scheme, the first heat conducting fin is perpendicular to the first preset direction, and the electrode assembly is provided with the plurality of pole pieces which are arranged in a stacking mode along the first preset direction, so that the connecting surface of the first connecting layer of the first heat conducting fin and the isolating membrane on one side of the adjacent electrode assembly is increased, the contact surface of the first heat conducting fin and the electrode assembly is enlarged, the heat dissipation area between the electrode assembly and the first heat conducting fin is increased, and the heat dissipation effect is improved.

In some embodiments, the cell further comprises two second thermally conductive sheets; the two second heat conducting fins are arranged at intervals along the first preset direction, and the plurality of electrode assemblies are arranged between the two second heat conducting fins.

In the above technical scheme, the battery cell is further provided with two second heat conducting fins, and the two second heat conducting fins are respectively arranged on two sides of the plurality of electrode assemblies in the first preset direction, so that heat of the electrode assemblies can be further led out, and the heat dissipation performance of the battery cell is further improved.

In some embodiments, the second heat conducting sheet includes a second connecting layer, a second heat conducting layer and a first insulating layer, which are sequentially stacked and distributed along the first preset direction; the second connection layer is thermally compositely connected with the connection part of the electrode assembly adjacent thereto.

In the above technical scheme, the second heat conduction layer of the second heat conduction sheet is provided with the second connection layer and the first insulation layer respectively on the two sides in the first preset direction, and can be in thermal compound connection with the connection part of the isolation membrane of the adjacent electrode assembly through the second connection layer, so as to realize the fixation of the second heat conduction sheet, thereby saving the occupied space of the battery cell, and realizing the lightness, thinness and lightness of the battery cell. In addition, the electrode assembly can be separated from the outside through the first insulating layer, so that potential safety hazards of electric leakage of the battery cell are avoided.

In some embodiments, the electrode assembly is formed with a tab at one end in a second preset direction; the battery cell further comprises two third heat conducting fins, the two third heat conducting fins are arranged at intervals along a third preset direction, the plurality of electrode assemblies are arranged between the two third heat conducting fins, and the first preset direction, the second preset direction and the third preset direction are mutually perpendicular.

In the above technical scheme, the battery cell is further provided with two third heat conducting fins, and the two third heat conducting fins are respectively arranged on two sides of the plurality of electrode assemblies in the third preset direction, so that heat conduction can be performed on two end faces of the electrode assemblies in the third preset direction, the heat dissipation performance of the battery cell is further improved, and the temperature rise of the battery cell is avoided.

In some embodiments, the third heat-conducting plate is clamped to the first heat-conducting plate.

In the technical scheme, the mode of adoption joint is connected third conducting strip detachably in first conducting strip in the ascending both ends of third preset side to realize the quick assembly disassembly and the change of third conducting strip, thereby only need when the third conducting strip appears damaging change the third conducting strip can, and then reduced the later maintenance cost of electric core. In addition, through with the third conducting strip joint on first conducting strip for the fixed of third conducting strip is not influenced by the shape at the ascending both ends of electrode assembly in the third preset direction, thereby makes the electric core of this kind of structure can adopt the electrode assembly of isostructure, and then has improved the variety of electric core.

In some embodiments, the third heat conductive sheet includes a third heat conductive layer and second insulating layers disposed on both sides of the third heat conductive layer in the third preset direction; a plurality of clamping grooves are formed in the two end faces of the first heat-conducting fin in the third preset direction; the third heat conducting fin is arranged on the second insulating layer on one side in the third preset direction, and a plurality of clamping portions are arranged on the second insulating layer, and each clamping portion is clamped in one clamping groove.

In the above technical scheme, the third conducting strip is provided with third conducting layer and two second insulating layers, two second insulating layers set up respectively in the both sides of third conducting layer in the third direction of predetermineeing, through set up a plurality of joint portions on a second insulating layer in two second insulating layers, and a plurality of draw-in grooves have been seted up respectively at the both ends of first conducting strip in the third direction of predetermineeing, every joint portion joint is in a draw-in groove, thereby realized third conducting strip joint in first conducting strip through this kind of structure, moreover, the steam generator is simple in structure, and the realization is convenient for. In addition, the electrode assembly can be separated from the outside through the second insulating layer, and the potential leakage hazard of the battery cell is eliminated.

In some embodiments, the first tie layer is a glue layer.

In the technical scheme, the glue layer is used as the first connecting layer, so that the material of the first connecting layer can be consistent with the material of the isolating membrane of the electrode assembly, and the first connecting layer and the isolating membrane are conveniently subjected to thermal compound connection.

In some embodiments, the first heat conducting layer is made of metal.

In the above technical scheme, the metal material is adopted as the material of the first heat conduction layer, so that the heat conductivity coefficient of the first heat conduction layer is higher, the first heat conduction sheet is convenient for conducting heat to the electrode assembly, and the heat dissipation effect of the first heat conduction sheet is improved.

In a second aspect, an embodiment of the present application further provides a battery cell, including a casing and the above-mentioned battery cell; the cell is contained within the housing.

In the technical scheme, the single battery with the structure can have good heat dissipation performance, so that the single battery can be prevented from influencing the use of the single battery due to the heating problem during working, the reliability of the single battery is poor, meanwhile, the electrolyte in the single battery can be prevented from decomposing gas under a high-temperature environment, the single battery is prevented from bulging, even the possibility of rupture and explosion is avoided, and the potential safety hazard of the single battery is eliminated. In addition, the battery monomer adopting the structure reduces the weight and the thickness of the battery monomer while ensuring the heat dissipation performance, and realizes the light weight and the light weight of the battery monomer.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

Fig. 1 is a schematic structural diagram of a battery cell provided in an embodiment of the present application;

fig. 2 is a cross-sectional view of the cell shown in fig. 1;

FIG. 3 is a cross-sectional view of the first thermally conductive sheet shown in FIG. 2;

FIG. 4 is a sectional view of the second thermally conductive sheet shown in FIG. 1;

FIG. 5 is a schematic structural view of the electrode assembly shown in FIG. 2;

fig. 6 is a schematic structural diagram of the battery cell (with the third thermally conductive sheet removed) shown in fig. 1;

FIG. 7 is a sectional view of the third thermally conductive sheet shown in FIG. 1;

fig. 8 is a schematic structural diagram of a battery cell provided in an embodiment of the present application;

fig. 9 is a top view of the battery cell shown in fig. 8.

Icon: 100-electric core; 10-an electrode assembly; 11-a tab; 20-a first thermally conductive sheet; 21-a first thermally conductive layer; 22-a first tie layer; 23-a card slot; 30-a second thermally conductive sheet; 31-a second tie layer; 32-a second thermally conductive layer; 33-a first insulating layer; 40-a third thermally conductive sheet; 41-third thermally conductive layer; 42-a second insulating layer; 43-a snap-in part; 50-a housing; 51-a housing; 52-a cover body; 521-a positive terminal; 522-negative terminal; 523-liquid injection hole; 200-a battery cell; x-a first preset direction; y-a second preset direction; z-a third predetermined direction.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the embodiments of the present application, it should be noted that the indication of orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship which is usually placed when the product of the application is used, or the orientation or positional relationship which is conventionally understood by those skilled in the art, is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," and "third" are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

Examples

The embodiment of the application provides a battery cell 100, which can improve that the heat dissipation performance of the existing battery cell is poor, so that the decline of an electrode active interface is accelerated, the reliability and the performance of the battery cell are poor, the battery cell has the problem of great potential safety hazard in a high-temperature environment, and the specific structure of the battery cell 100 is elaborated in detail by combining the attached drawings.

As shown in fig. 1 and 2, the battery cell 100 includes a plurality of electrode assemblies 10 and at least one first thermally conductive sheet 20. A plurality of electrode assemblies 10 are stacked in the first preset direction X, and the electrode assemblies 10 have separators including connection parts at both sides of the electrode assemblies 10 in the first preset direction X. The first thermally conductive sheet 20 is disposed between two adjacent electrode assemblies 10 in the first predetermined direction X. As shown in fig. 2 and 3, the first thermally conductive sheet 20 includes a first thermally conductive layer 21 and first connection layers 22 disposed on both sides of the first thermally conductive layer 21 in the first predetermined direction X, and the first connection layers 22 are thermally compositely connected to connection portions of the electrode assemblies 10 adjacent thereto.

The battery cell 100 is provided with a plurality of electrode assemblies 10, and the first heat conducting sheet 20 is arranged between two adjacent electrode assemblies 10 to provide a heat conducting high-speed channel from the inside of the battery cell 100 by utilizing the heat conducting capacity of the first heat conducting sheet 20, so that heat between the electrode assemblies 10 is conducted out when the battery cell 100 is in operation, thereby avoiding the temperature rise of the battery cell 100 caused by the heat accumulation between the electrode assemblies 10, further improving the heat dissipation performance of the battery cell 100, preventing the performance degradation of the battery cell 100, and eliminating the potential safety hazard of the battery cell 100 caused by the temperature rise. In addition, the separator includes connection portions at both sides of the electrode assembly 10 in the first predetermined direction X, that is, at least a portion of the separator is located at both sides of the electrode assembly 10 in the first predetermined direction X, the first thermally conductive sheet 20 has first connection layers 22 respectively disposed at both sides of the first thermally conductive layer 21 in the first predetermined direction X, the first thermally conductive sheet 20 is thermally compositely connected to the connection portions of the separator of the adjacent electrode assembly 10 through the first connection layers 22, so that the first connection layers 22 are thermally compositely connected to the separator located at one side of the electrode assembly 10 to fix the first thermally conductive sheet 20 between the adjacent two electrode assemblies 10, and the battery cell 100 adopting such a structure improves the performance and simultaneously avoids the fixation of the first thermally conductive sheet 20 by other components, thereby simplifying the production steps, reducing the weight and the production cost of the battery cell 100, and the first connecting layer 22 of the first heat conducting strip 20 is thermally and compositely connected with the adjacent electrode assembly 10, so as to reduce the thickness of the battery cell 100, save the occupied space of the battery cell 100, and further facilitate increasing the capacity of the battery cell 100.

The electrode assembly 10 includes a plurality of pole pieces stacked in a first predetermined direction X. The first heat-conducting strip 20 is perpendicular to the first predetermined direction X. The first heat conducting sheet 20 is arranged perpendicular to the first preset direction X, and the electrode assembly 10 is provided with a plurality of pole pieces which are arranged in a stacking manner along the first preset direction X, so that the connection surface between the first connection layer 22 of the first heat conducting sheet 20 and the adjacent isolating membrane on one side of the electrode assembly 10 is increased, the contact surface between the first heat conducting sheet 20 and the electrode assembly 10 is enlarged, the heat dissipation area between the electrode assembly 10 and the first heat conducting sheet 20 is increased, and the heat dissipation effect is improved.

Illustratively, as shown in fig. 2, the electrode assembly 10 has four, and the first thermally conductive sheet 20 has three. In other embodiments, the number of the electrode assemblies 10 may be other, for example, five electrode assemblies 10 and four first heat conductive sheets 20.

The electrode assembly 10 is composed of a positive electrode tab, a negative electrode tab, and a separator. The battery cell 100 mainly depends on metal ions moving between the positive plate and the negative plate to operate. The positive plate comprises a positive current collector and a positive active substance body, the positive active substance body is coated on the surface of the positive current collector, the positive current collector which is not coated with the positive active substance body protrudes out of the positive current collector which is coated with the positive active substance body, and the positive current collector which is not coated with the positive active substance body is used as a positive electrode tab. Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate, or the like. The negative plate comprises a negative current collector and a negative active substance body, the negative active substance body is coated on the surface of the negative current collector, the negative current collector which is not coated with the negative active substance body protrudes out of the negative current collector coated with the negative active substance body, and the negative current collector which is not coated with the negative active substance body is used as a negative electrode tab. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon, silicon, or the like.

The isolating film is used for isolating the positive plate from the negative plate so as to reduce the risk of short circuit between the positive plate and the negative plate. The material of the isolation film is polyvinylidene fluoride, and in other embodiments, the isolation film may also be PP (polypropylene) or PE (polyethylene). In addition, the electrode assembly 10 may have a flat winding structure (having a straight region and two arc regions connected to two ends of the straight region, and formed by stacking and then bending and winding the positive electrode plate, the separator, and the negative electrode plate) or a laminated structure (formed by stacking and then continuously folding the positive electrode plate, the separator, and the negative electrode plate in an S-shape), and the embodiment of the present invention is not limited thereto.

In this embodiment, the first connection layer 22 is a glue layer. The use of the adhesive layer as the first connection layer 22 enables the material of the first connection layer 22 to be consistent with the material of the separator of the electrode assembly 10, thereby facilitating the thermal compound connection of the first connection layer 22 and the separator.

Illustratively, the material of the first connection layer 22 is polyvinylidene fluoride.

Further, the first heat conduction layer 21 is made of a metal material. The first heat conduction layer 21 is made of a metal material, so that the heat conductivity coefficient of the first heat conduction layer 21 is high, and the first heat conduction sheet 20 conducts heat to the electrode assembly 10, so as to improve the heat dissipation effect of the first heat conduction sheet 20.

The first heat conduction layer 21 is made of copper, and in other embodiments, the first heat conduction layer 21 may also be made of aluminum or an alloy.

In some embodiments, as shown in fig. 1 and fig. 2, the battery cell 100 may further include two second heat conductive sheets 30. The two second heat conductive sheets 30 are disposed at intervals along the first predetermined direction X, and the plurality of electrode assemblies 10 are disposed between the two second heat conductive sheets 30. The two second heat conducting fins 30 are respectively disposed on two sides of the plurality of electrode assemblies 10 in the first preset direction X, so as to further conduct heat of the electrode assemblies 10, and further improve the heat dissipation performance of the battery cell 100.

As shown in fig. 2 and 4, the second heat conduction sheet 30 includes a second connection layer 31, a second heat conduction layer 32, and a first insulation layer 33, which are sequentially stacked and distributed along the first predetermined direction X. The second connection layer 31 is thermally compositely connected with the connection part of the electrode assembly 10 adjacent thereto.

The second heat conducting layer 32 of the second heat conducting sheet 30 is provided with a second connecting layer 31 and a first insulating layer 33 on two sides in the first preset direction X, and the second connecting layer 31 can be thermally and compositely connected with the connecting portion of the isolating membrane of the adjacent electrode assembly 10 to fix the second heat conducting sheet 30, so that the occupied space of the battery cell 100 can be saved, and the battery cell 100 is light, thin and light. In addition, the electrode assembly 10 can be separated from the outside by the first insulating layer 33, so as to avoid the safety hazard of electric leakage in the battery cell 100.

Illustratively, the material of the second connection layer 31 is polyvinylidene fluoride.

For example, the material of the second heat conduction layer 32 is copper, and in other embodiments, the second heat conduction layer 32 may also be aluminum or an alloy.

For example, the material of the first insulating layer 33 is epdm, and in other embodiments, the material of the first insulating layer 33 may also be one of polypropylene, polytetrafluoroethylene, perfluoroether, or the like.

In some embodiments, as shown in fig. 1, the battery cell 100 may further include two third thermally conductive sheets 40. As shown in fig. 1 and 5 in combination, one end of the electrode assembly 10 in the second preset direction Y is formed with a tab 11. The two third heat-conducting fins 40 are arranged at intervals along a third preset direction Z, the plurality of electrode assemblies 10 are arranged between the two third heat-conducting fins 40, and the first preset direction X, the second preset direction Y and the third preset direction Z are mutually perpendicular in pairs. By respectively disposing the two third heat conducting fins 40 on two sides of the plurality of electrode assemblies 10 in the third preset direction Z, heat can be conducted on two end faces of the electrode assemblies 10 in the third preset direction Z, so as to further improve the heat dissipation performance of the battery cell 100 and avoid the temperature increase of the battery cell 100.

It should be noted that two tabs 11 (a positive tab and a negative tab, respectively, and the positive tab and the negative tab are arranged at an interval along a third preset direction Z) are disposed on the electrode assembly 10, and the two tabs 11 are both disposed at one end of the electrode assembly 10 in the second preset direction Y. In order to ensure that the fuse is not fused when a large current is passed, the number of the positive pole lugs is multiple and the positive pole lugs are folded together, and the number of the negative pole lugs is multiple and the negative pole lugs are folded together.

Illustratively, the material of the positive electrode tab is aluminum, and the material of the negative electrode tab is copper.

Further, the third heat-conducting strip 40 is connected to the first heat-conducting strip 20 in a clamping manner. The mode of adoption joint is connected third conducting strip 40 detachably in the both ends of first conducting strip 20 on the third direction Z of predetermineeing to realize third conducting strip 40's quick assembly disassembly and change, thereby only need when third conducting strip 40 appears damaging change third conducting strip 40 can, and then reduced electric core 100's later maintenance cost. In addition, the third thermally conductive sheet 40 is connected to the first thermally conductive sheet 20 in a clamped manner, so that the third thermally conductive sheet 40 is not affected by the shapes of the two ends of the electrode assembly 10 in the third preset direction Z, and thus the battery cell 100 with the structure can adopt the electrode assemblies 10 with different structures, and the diversity of the battery cell 100 is improved. It should be noted that, in other embodiments, the third thermally conductive sheet 40 may also be connected to the first thermally conductive sheet 20 by bonding, bolting, or the like.

As shown in fig. 3 and fig. 6, a plurality of clamping grooves 23 are respectively disposed on two end surfaces of the first heat conducting sheet 20 in the third preset direction Z, and the clamping grooves 23 are disposed on two end surfaces of the first heat conducting layer 21 of the first heat conducting sheet 20 in the third preset direction Z. As shown in fig. 6 and 7, the third heat conductive sheet 40 includes a third heat conductive layer 41 and second insulating layers 42 disposed on both sides of the third heat conductive layer 41 in the third preset direction Z. The third heat conducting strip 40 is provided with a plurality of clamping portions 43 on the second insulating layer 42 on one side in the third preset direction Z, and each clamping portion 43 is clamped in one clamping groove 23.

The third conducting strip 40 is provided with a third conducting layer 41 and two second insulating layers 42, the two second insulating layers 42 are respectively arranged on two sides of the third conducting layer 41 in the third preset direction Z, a plurality of clamping portions 43 are arranged on one second insulating layer 42 in the two second insulating layers 42, a plurality of clamping grooves 23 are respectively arranged at two ends of the first conducting strip 20 in the third preset direction Z, each clamping portion 43 is clamped in one clamping groove 23, and therefore the third conducting strip 40 is clamped in the first conducting strip 20 through the structure, the structure is simple, and the realization is convenient. In addition, the electrode assembly 10 can be separated from the outside by the second insulating layer 42, eliminating the potential for leakage of electricity from the battery cell 100.

For example, as shown in fig. 6 and fig. 7, two end faces of the first heat conducting strip 20 in the first preset direction X are respectively provided with three clamping grooves 23, nine clamping portions 43 are arranged on the second insulating layer 42 on one side of each third heat conducting strip 40, and each clamping portion 43 is clamped in the corresponding clamping groove 23.

For example, the material of the second insulating layer 42 is epdm, and in other embodiments, the material of the second insulating layer 42 may also be one of polypropylene, teflon, perfluoroether, or the like.

The material of the third heat conduction layer 41 is copper, and in other embodiments, the material of the third heat conduction layer 41 may also be aluminum or an alloy.

In addition, as shown in fig. 8, an embodiment of the present application further provides a battery cell 200, which includes a casing 50 and the battery cell 100 (not shown in the figure), where the battery cell 100 is accommodated in the casing 50. The battery cell 200 is also provided with an electrolyte, which is contained in the case 50. The single battery 200 with the structure has good heat dissipation performance, so that the single battery 200 can be prevented from being affected by heat generation during working, the reliability of the single battery 200 is deteriorated, meanwhile, the electrolyte in the single battery 200 can be prevented from decomposing gas under a high-temperature environment, the single battery 200 is prevented from bulging, even the possibility of rupture and explosion is avoided, and the potential safety hazard of the single battery 200 is eliminated. In addition, the battery cell 200 with the structure reduces the weight and thickness of the battery cell 200 while ensuring the heat dissipation performance, and realizes the light weight and light weight of the battery cell 200.

The housing 50 includes a casing 51 and a cover 52, the casing 51 is a rectangular parallelepiped hollow structure with an opening at one end, and the cover 52 covers the opening of the casing 51 and forms a sealing connection to form a sealed space for accommodating the battery cell 100 and the electrolyte.

When assembling the battery cell 200, the battery cell 100 may be placed in the casing 51, the electrolyte may be filled into the casing 51, and the cover 52 may be covered on the opening of the casing 51.

It is understood that the casing 50 is not limited to the above structure, and in other embodiments, the casing 50 may also have other structures, for example, the casing 50 includes a casing 51 and two covers 52, the casing 51 is a rectangular hollow structure with two opposite ends open, and the two covers 52 respectively cover the openings at the two ends of the casing 51 and form a sealed connection to form a sealed space for accommodating the battery cells 100 and the electrolyte.

Further, the battery cell 200 is further provided with a positive connection sheet and a negative connection sheet, the positive tabs of the plurality of electrode assemblies 10 of the battery cell 100 are all electrically connected with the positive connection sheet, and the negative tabs of the plurality of electrode assemblies 10 of the battery cell 100 are all electrically connected with the negative connection sheet.

Illustratively, the positive electrode tab is welded to the positive electrode connecting sheet by an ultrasonic welding process, and the negative electrode tab is welded to the negative electrode connecting sheet by an ultrasonic welding process.

Further, as shown in fig. 8 and 9, a positive terminal 521 and a negative terminal 522 are disposed on the cover 52, the positive terminal 521 and the negative terminal 522 are arranged on the cover 52 at intervals along the third preset direction Z, the positive terminal 521 is electrically connected to the positive connection sheet, and the negative terminal 522 is electrically connected to the negative connection sheet, so that the battery cell 200 can be charged and discharged through the positive terminal 521 and the negative terminal 522.

Optionally, as shown in fig. 9, a liquid injection hole 523 for adding electrolyte is further formed in the cover 52, and the battery cell 200 with the structure facilitates filling of electrolyte when the electrolyte is insufficient in later use, so that the later maintenance cost can be reduced.

In addition, an electric device is also provided in the embodiment of the present application, and includes the battery cell 200 described above. The electric equipment can be vehicles, mobile phones, portable equipment, notebook computers, ships, spacecrafts, electric toys, electric tools and the like. The vehicle can be a fuel oil vehicle, a 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; spacecraft include aircraft, rockets, space shuttles, and spacecraft, among others; electric toys include stationary or mobile electric toys, such as game machines, electric car toys, electric ship toys, electric airplane toys, and the like; the electric power tools include metal cutting electric power tools, grinding electric power tools, assembly electric power tools, and electric power tools for railways, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, electric impact drills, concrete vibrators, and electric planers. The embodiment of the present application does not specifically limit the above-mentioned electric devices.

For convenience of explanation, the following embodiments will be described by taking an electric device as an example of a vehicle.

For example, the electric device is a vehicle, the battery cell 200 is disposed inside the vehicle, and the battery cell 200 may be disposed at the bottom, the head, or the tail of the vehicle. The battery cell 200 may be used for power supply of a vehicle, for example, the battery cell 200 may serve as an operation power source of the vehicle.

The vehicle may further include a controller for controlling the battery cell 200 to supply power to the motor, for example, for start-up, navigation, and operational power demand while the vehicle is traveling.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell, comprising:

a plurality of electrode assemblies stacked in a first preset direction, the electrode assemblies having a separation film including connection parts at both sides of the electrode assemblies in the first preset direction; and

at least one first thermally conductive sheet disposed between adjacent two of the electrode assemblies in the first predetermined direction;

the first heat conducting sheet comprises a first heat conducting layer and first connecting layers arranged on two sides of the first heat conducting layer in the first preset direction, and the first connecting layers are in thermal compound connection with the connecting parts of the electrode assemblies adjacent to the first connecting layers.

2. The cell of claim 1, wherein the electrode assembly comprises a plurality of pole pieces arranged in a stack along the first predetermined direction;

the first heat-conducting fin is perpendicular to the first preset direction.

3. The cell of claim 1, further comprising two second thermally conductive sheets;

the two second heat conducting fins are arranged at intervals along the first preset direction, and the plurality of electrode assemblies are arranged between the two second heat conducting fins.

4. The battery cell of claim 3, wherein the second heat conducting sheet comprises a second connection layer, a second heat conducting layer and a first insulating layer, which are sequentially stacked and distributed along the first preset direction;

the second connection layer is thermally compositely connected with the connection part of the electrode assembly adjacent thereto.

5. The battery cell of any one of claims 1 to 4, wherein a tab is formed at one end of the electrode assembly in the second predetermined direction;

the battery cell further comprises two third heat conducting fins, the two third heat conducting fins are arranged at intervals along a third preset direction, the plurality of electrode assemblies are arranged between the two third heat conducting fins, and the first preset direction, the second preset direction and the third preset direction are mutually perpendicular.

6. The electrical core of claim 5, wherein the third thermally conductive sheet is clamped to the first thermally conductive sheet.

7. The cell of claim 6, wherein the third thermally conductive sheet comprises a third thermally conductive layer and second insulating layers disposed on two sides of the third thermally conductive layer in the third predetermined direction;

a plurality of clamping grooves are formed in the two end faces of the first heat-conducting fin in the third preset direction;

the third heat conducting fin is arranged on the second insulating layer on one side in the third preset direction, and a plurality of clamping portions are arranged on the second insulating layer, and each clamping portion is clamped in one clamping groove.

8. The cell of claim 1, wherein the first tie layer is a glue layer.

9. The electrical core of claim 1, wherein the first thermally conductive layer is a metal material.

10. A battery cell, comprising:

a housing; and

the electrical core of any of claims 1-9, contained within the housing.