Battery and electric device

Abstract

The utility model provides a battery and a power utilization device, and relates to the technical field of batteries, the battery comprises: a housing assembly, which comprises a housing and a cover plate, one end of the housing along the axial direction is provided with an opening, and the cover plate seals the opening; the electrode assembly is arranged in the inner cavity of the shell, and a tab is arranged at one end, facing the cover plate, of the electrode assembly; wherein the tab is electrically connected with the cover plate, a first heat conduction structure and a second heat conduction structure are arranged between the tab and the cover plate, and the first heat conduction structure and the second heat conduction structure are arranged at intervals in the radial direction of the cover plate; the first heat conduction structure and the second heat conduction structure transmit heat generated on the electrode assembly to the cover plate. According to the battery disclosed by the utility model, at least two heat conduction structures are arranged between the cover plate and the electrode assembly, so that a heat conduction path is increased, and the heat dissipation efficiency of the battery can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery and an electrical device. Background Art

[0002] More and more electrical equipment uses batteries as energy storage and supply devices, such as new energy vehicles, communication base stations, energy storage containers, etc.

[0003] Current battery designs often pursue high energy density and high output power, generating a lot of heat when large current output is applied. Due to the small number of heat dissipation channels between the electrode assembly and the external cooling assembly, heat will be concentrated inside the battery, affecting the safety performance of the battery. Utility Model Content

[0004] In view of the above problems, the utility model provides a battery and an electrical device, wherein at least two heat-conducting structures are arranged between the cover plate and the electrode assembly, thereby increasing the heat conduction path and improving the heat dissipation efficiency of the battery.

[0005] The utility model provides a battery, comprising: a shell assembly, comprising an outer shell and a cover plate, wherein one end of the outer shell along the axial direction is provided with an opening, and the cover plate seals the opening; an electrode assembly, arranged in the inner cavity of the outer shell, and one end of the electrode assembly facing the cover plate is provided with a pole ear; wherein the pole ear is electrically connected to the cover plate, and a first heat-conducting structure and a second heat-conducting structure are included between the pole ear and the cover plate, the first heat-conducting structure and the second heat-conducting structure are arranged at intervals along the radial direction of the cover plate, and the first heat-conducting structure and the second heat-conducting structure transfer the heat generated on the pole ear to the cover plate.

[0006] In some embodiments, the edge of the cover plate includes a boss protruding toward one side of the electrode assembly, and the outer diameter of the boss is adapted to the inner diameter of the shell, and the boss is embedded in the opening.

[0007] In some embodiments, the battery further includes: a current collecting plate, the current collecting plate is welded to the cover plate and the tab respectively, and the welding point between the current collecting plate and the cover plate constitutes the first heat conducting structure.

[0008] In some embodiments, the second heat conductive structure is in thermal contact with the collecting plate and the cover plate, respectively.

[0009] In some embodiments, the second heat conductive structure is fixedly connected to at least one of the collecting plate and the cover plate.

[0010] In some embodiments, the second heat conductive structure is integrally formed with the collecting plate.

[0011] In some embodiments, the second heat-conducting structure is at least one of a heat-conducting adhesive, a heat-conducting pad, and a metal piece.

[0012] In some embodiments, the thermal conductivity coefficient t of the second heat-conducting structure has a value range of: t> 20 W / mK.

[0013] In some embodiments, a middle area of ​​the collecting plate is welded to the cover plate to form the first heat conducting structure.

[0014] In some embodiments, the second heat-conducting structure is located radially inward of the boss and spaced apart from the first heat-conducting structure, and a radial distance between the second heat-conducting structure and the first heat-conducting structure is greater than 5 mm.

[0015] In some embodiments, the second heat conductive structure is stacked between the boss and the electrode assembly.

[0016] In some embodiments, at least a portion of the second heat-conducting structure along the radial direction is stacked with the collecting disk; or, the collecting disk is located radially inside the second heat-conducting structure, and the inner wall of the second heat-conducting structure abuts against the peripheral wall of the collecting disk.

[0017] In some embodiments, the collecting plate includes a plate body and a folded edge portion, the outer diameter of the plate body is adapted to the inner diameter of the outer shell, one end of the folded edge portion is connected to the edge of the plate body, at least part of the structure of the folded edge portion extends in a direction parallel to the plate body, and the folded edge portion constitutes the second heat conductive structure.

[0018] In some embodiments, an installation gap is defined between the folded edge portion and the disk body, and the battery further includes an elastic member disposed in the installation gap, with two ends of the elastic member respectively abutting against the folded edge portion and the disk body.

[0019] In some embodiments, the edge of the collecting plate is welded to the boss to form the first heat conducting structure.

[0020] In some embodiments, the side of the boss facing away from the electrode assembly includes a first groove, and the bottom wall of the first groove is welded to the current collecting plate to form the first heat conducting structure.

[0021] In some embodiments, the second heat-conducting structure is disposed radially inward of the boss, and a radial distance between the second heat-conducting structure and the boss is greater than 5 mm.

[0022] In some embodiments, the second heat-conducting structure is disposed in a middle region of the collecting plate, and the second heat-conducting structure is welded to the cover plate.

[0023] In some embodiments, the collecting plate includes a first thickened portion and a second thickened portion, the first thickened portion is welded to the cover plate to form the first heat-conducting structure, and the second thickened portion is welded to the cover plate to form the second heat-conducting structure.

[0024] In some embodiments, the material of the first thickened portion is the same as that of the cover plate; and / or the material of the second thickened portion is the same as that of the cover plate.

[0025] In some embodiments, the welding area corresponding to the second heat-conducting structure is S1, the welding area corresponding to the first heat-conducting structure is S2, and S1 and S2 satisfy: S1 / S2≤1 / 8.8.

[0026] In some embodiments, the first heat-conducting structure is disposed in the middle area of ​​the collecting disk, the second heat-conducting structure is disposed at the edge of the collecting disk, the second heat-conducting structure extends along the axial direction of the cover plate toward one side of the cover plate, and the second heat-conducting structure is embedded between the boss and the outer shell.

[0027] In some embodiments, the tab and the cover plate are electrically connected via the first heat conductive structure.

[0028] In some embodiments, the cover plate and the tab are welded to form the first heat-conducting structure.

[0029] In some embodiments, the battery is a cylindrical battery.

[0030] In some embodiments, the outer shell includes a top wall opposite to the cover plate and a side wall surrounding the top wall, the top wall and the side wall are integrally formed, and the side wall defines the opening; the battery also includes a pole, the pole is passed through the top wall, the end of the electrode assembly facing the pole includes a positive pole ear, the pole is electrically connected to the positive pole ear, the pole ear at the end of the electrode assembly facing the cover plate is a negative pole ear, and the outer shell is electrically connected to the negative pole ear.

[0031] The utility model also provides an electrical device, comprising: the battery according to the first aspect of the utility model.

[0032] According to the battery of the utility model, a first heat-conducting structure and a second heat-conducting structure are arranged between the cover plate and the electrode assembly, so that the heat generated by the electrode assembly can be transferred to the cover plate through the first heat-conducting structure and the second heat-conducting structure respectively, thereby increasing the heat conduction path between the electrode assembly and the cover plate, optimizing the temperature field distribution on the cover plate side, and helping to improve the heat dissipation efficiency of the battery, making the battery heat dissipation method more suitable for system-level thermal management requirements, thereby expanding the application scope of the battery, and the overall implementation method is relatively simple and easy to implement. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0034] Figure 1 It is a schematic diagram of the structure of batteries in some embodiments of the utility model;

[0035] Figure 2 For along Figure 1 The cross-sectional view of the AA section, Figure 2 The second heat-conducting structure is integrally formed on the collecting plate;

[0036] Figure 3 It is a schematic diagram of the structure of batteries in some embodiments of the utility model;

[0037] Figure 4 For along Figure 3 Sectional view of the middle BB section;

[0038] Figure 5 It is a schematic diagram of the structure of batteries in some embodiments of the utility model;

[0039] Figure 6 For along Figure 5 Sectional view of the CC section;

[0040] Figure 7 for Figure 6 The enlarged view of the area D is shown in the middle circle. Figure 7 The second heat conducting structure and the current collecting plate form a composite structure;

[0041] Figure 8 for Figure 5 A schematic diagram of the structure of the current collecting plate in FIG.

[0042] Fig. 9 It is a schematic diagram of the structure of batteries in some embodiments of the utility model;

[0043] Fig.10 For along Fig. 9 Sectional view of the EE section;

[0044] Fig.11 for Fig.10 The middle circle shows an enlarged view of site F;

[0045] Fig.12 for Fig. 9 A schematic diagram of the structure of the current collecting plate in FIG.

[0046] Fig.13 It is a schematic diagram of the structure of batteries in some embodiments of the utility model;

[0047] Fig.14 For along Fig.13 The cross-sectional view of the GG section, Fig.14 The second heat-conducting structure is independent of the collecting plate and the cover plate;

[0048] Fig.15 This is a schematic diagram of the structure of batteries in some embodiments of the utility model. Fig.15 The electrode lugs of the electrode assembly are welded to the cover plate to form a first heat-conducting structure.

[0049] Description of reference numerals:

[0050] 100-battery;

[0051] 1- Shell assembly;

[0052] 11-housing; 111-top wall; 112-side wall;

[0053] 12-cover plate; 121-boss; 122-blocking cover; 123-first groove; 124-second groove;

[0054] 2-electrode assembly; 21-ear;

[0055] 3-current collecting plate; 301-plate body; 302-folded edge; 303-avoidance gap;

[0056] 31-Current plate body;

[0057] 4-a first heat conducting structure;

[0058] 5- second heat conducting structure;

[0059] 6-Pole. DETAILED DESCRIPTION

[0060] In order to make the above-mentioned purposes, features and advantages of the embodiments of the present application more obvious and understandable, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work belong to the scope of protection of this application.

[0061] More and more electrical devices use batteries as energy storage and supply devices. Electrical devices can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys and electric tools, etc. Vehicles can be fuel vehicles, gas vehicles or new energy vehicles. New energy vehicles can be pure electric vehicles, hybrid vehicles or extended-range vehicles, etc. Spacecraft include airplanes, rockets, space shuttles and spacecrafts, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc. Electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers, etc. The embodiments of the present application do not impose special restrictions on the above-mentioned electrical devices.

[0062] The electrical device may include: a device body and a battery. The device body may include a battery compartment, the battery is disposed in the battery compartment and is electrically connected to the device body, for example, a power supply interface may be provided in the battery compartment, and the battery may be connected to the power supply interface.

[0063] In the embodiments of the present application, the battery may be a secondary battery, which refers to a battery cell that can be used continuously by activating the active material by allowing electricity to flow after the battery is discharged. The battery may be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, etc., and the embodiments of the present application are not limited thereto.

[0064] At present, the collector plate of some battery models is only welded to the cover plate in a single local area (such as the middle area) to make the cover plate charged. This method results in only one heat dissipation path between the collector plate and the cover plate formed by the welding area. At the end of the electrode assembly, the heat can only be transferred to the cover plate through the welding area between the collector plate and the cover plate, and then dissipated to the outside to achieve heat dissipation. The heat dissipation path is long, the heat dissipation efficiency is low, and it is difficult to meet the needs of system-level thermal management.

[0065] In view of this, this embodiment provides a battery 100, referring to Figure 1-Figure 14 The battery 100 includes: a shell assembly 1 and an electrode assembly 2. The shell assembly 1 includes a shell 11 and a cover plate 12. The shell 11 may be cylindrical. An opening is provided at one end of the shell 11 in the axial direction. The cover plate 12 is sealed at the opening. The cover plate 12 may be a negative electrode cover plate 12.

[0066] The electrode assembly 2 may include a positive electrode sheet, a negative electrode sheet and a separator. The positive electrode sheet, the separator and the negative electrode sheet are stacked and arranged in sequence and then wound to form the electrode assembly 2, that is, the electrode assembly 2 is a wound battery cell. The electrode assembly 2 is arranged in the inner cavity of the housing 11, and a pole ear 21 is provided at one end of the electrode assembly 2 facing the cover plate 12.

[0067] The pole lug 21 is electrically connected to the cover plate 12 , wherein the pole lug 21 can be directly connected to the cover plate 12 , or the pole lug 21 can also be electrically connected to the cover plate 12 via an intermediate component such as a current collecting plate 3 .

[0068] The first heat-conducting structure 4 and the second heat-conducting structure 5 are included between the pole tab 21 and the cover plate 12. The first heat-conducting structure 4 and the second heat-conducting structure 5 are arranged at intervals along the radial direction of the cover plate 12. The first heat-conducting structure 4 and the second heat-conducting structure 5 can transfer the heat generated on the electrode assembly 2 to the cover plate 12. Among them, one of the first heat-conducting structure 4 and the second heat-conducting structure 5 can be a structure set for the pole tab 21 and the cover plate 12 to achieve electrical connection, such as a welding area, and the other can be a separately set heat-conducting structure. In other words, there are at least two heat-conducting areas between the pole tab 21 and the cover plate 12, so that the heat conduction path between the electrode assembly 2 and the cover plate 12 can be increased, and the heat dissipation efficiency of the battery 100 can be improved.

[0069] According to the battery 100 of the embodiment of the utility model, the first heat-conducting structure 4 and the second heat-conducting structure 5 are arranged between the cover plate 12 and the electrode assembly 2, so that the heat generated by the electrode assembly 2 can be transferred to the cover plate 12 through the first heat-conducting structure 4 and the second heat-conducting structure 5 respectively, thereby increasing the heat conduction path between the electrode assembly 2 and the cover plate 12, optimizing the temperature field distribution on the cover plate 12 side, and helping to improve the heat dissipation efficiency of the battery 100, so that the heat dissipation method of the battery 100 is more suitable for system-level thermal management requirements, thereby expanding the scope of application of the battery 100, and the overall implementation method is relatively simple and easy to implement.

[0070] In some embodiments, reference Figure 2 , Figure 4 , Figure 7 , Fig.11 and Fig.14, a boss 121 is provided on the side of the cover plate 12 facing the electrode assembly 2, that is, the boss 121 protrudes from the inner surface of the cover plate 12, for example, the boss 121 can be a circular boss, in which case the diameter of the boss 121 is adapted to the diameter of the shell 11; or, the boss 121 extends along the circumference of the cover plate 12, and the boss 121 is arranged adjacent to the edge of the cover plate 12 to form an annular boss; or, the boss 121 can be formed by bending the inner and outer surfaces of the cover plate 12 toward the inside of the battery 100, in which case the portion of the outer surface of the cover plate 12 corresponding to the boss 121 is formed into a groove-like structure; or, the boss 121 can also be formed by only the inner surface of the cover plate 12 protruding toward the inside of the battery 100, in which case the portion of the outer surface of the cover plate 12 corresponding to the boss 121 can be formed into a plane, or a concave-convex structure can be provided as required; the boss 121 can be formed into a complete circular ring, or can include a plurality of boss segments spaced apart along the circumferential direction. The outer diameter of the boss 121 matches the inner diameter of the housing 11 , and the boss 121 is embedded in the opening.

[0071] The cover plate 12 is fixed to the housing 11 by embedding the boss 121 into the opening. In some possible embodiments, the boss 121 and the housing 11 may be interference fit to improve the connection stability between the cover plate 12 and the housing 11; or, other structural parts may be embedded between the boss 121 and the housing 11 to achieve a tight connection between the boss 121 and the housing 11 and improve the sealing. Of course, in order to further improve the sealing at the opening and the stability of the connection between the cover plate 12 and the housing 11, the cover plate 12 and the housing 11 may also be welded, such as laser welding.

[0072] A rib is provided on the radial outer side of the boss 121 , and the rib abuts against the end of the shell 11 to prevent the cover plate 12 from sinking into the inner cavity of the shell 11 as a whole. In addition, when the cover plate 12 and the shell 11 are welded, the rib can also provide a welding position.

[0073] The battery 100 may further include a current collecting plate 3, referring to Figure 2 , Figure 4 , Figure 7 , Fig.11 and Fig.14 The current collecting plate 3 is arranged at one end of the electrode assembly 2, the current collecting plate 3 is welded to the pole ear 21, and the current collecting plate 3 is welded to the cover plate 12, wherein the welding part between the current collecting plate 3 and the cover plate 12 constitutes the first heat conducting structure 4. In this way, the electrode assembly 2 can conduct current to the cover plate 12 through the current collecting plate 3, and the welding area formed between the current collecting plate 3 and the cover plate 12 for achieving conduction can be directly used as the heat conducting area. On this basis, it is only necessary to set up the second heat conducting structure 5 to achieve multi-path heat dissipation between the current collecting plate 3 and the cover plate 12. The implementation method is relatively simple and easy to implement, and the second heat conducting structure 5 helps to optimize the temperature field distribution.

[0074] Since the positive electrode side of the electrode assembly 2 is usually connected to the positive electrode current collecting plate by the pole 6, the current collecting plate 3 connected to the cover plate 12 in this embodiment is the negative electrode current collecting plate 3 of the battery 100, and accordingly, the cover plate 12 is the negative electrode cover plate 12.

[0075] In some embodiments, reference Figure 7 , Fig.14 , the second heat-conducting structure 5 is in heat-conducting contact with the collecting plate 3 and the cover plate 12 respectively. At this time, the second heat-conducting structure 5 can be a heat-conducting member independent of the collecting plate 3 and the cover plate 12. The heat-conducting member is only in contact with the collecting plate 3 and the cover plate 12 but not connected. Moreover, the material of the heat-conducting member can be the same as or different from the material of any one of the collecting plate 3 and the cover plate 12; or, the second heat-conducting structure 5 can also be configured to be connected to at least one of the collecting plate 3 and the cover plate 12. In this way, the second heat-conducting structure 5 can be arranged in various ways and is easy to implement.

[0076] In some embodiments, the second heat-conducting structure 5 is fixedly connected to at least one of the current collecting plate 3 and the cover plate 12, that is, the second heat-conducting structure 5 can be fixedly connected only to the current collecting plate 3, or only to the cover plate 12, or fixedly connected to both the current collecting plate 3 and the cover plate 12. The fixed connection can be welding or other connection methods. In this way, the tightness of the connection between the second heat-conducting structure 5 and the current collecting plate 3 or the cover plate 12 can be enhanced to improve the heat conduction efficiency between the current collecting plate 3 and the cover plate 12, and it is easy to assemble and can reduce the assembly process.

[0077] In some embodiments, Figure 2 and Fig.11 As shown, the second heat-conducting structure 5 is integrally formed with the current collecting plate 3, in other words, the second heat-conducting structure 5 is a part of the current collecting plate 3. In this way, it is possible to save the need to manufacture additional components, which is conducive to simplifying the overall structure and assembly method, and only the structure of the current collecting plate 3 needs to be adjusted, without adjusting the structure of the cover plate 12 and the housing 11. The current collecting plate 3 is simple to form, and the manufacturing cost can be reduced under the premise of increasing the heat conduction path. When the second heat-conducting structure 5 is a metal structure, the heat conduction effect is better.

[0078] In some embodiments, the second heat-conducting structure 5 is at least one of a heat-conducting adhesive, a heat-conducting pad and a metal part. Thus, the second heat-conducting structure 5 has good heat-conducting ability, and the structure of the second heat-conducting structure 5 is relatively simple and the cost is relatively low.

[0079] In some embodiments, the value range of the thermal conductivity coefficient t of the second heat-conducting structure 5 is: t>20W / mK. In this way, it can be ensured that the second heat-conducting structure 5 has good thermal conductivity to improve the heat dissipation efficiency.

[0080] In some embodiments, in combination Figure 2 , Figure 4 , Figure 7 , Fig.11 and Fig.14 , the first heat-conducting structure 4 is located in the middle area of ​​the current collecting plate 3, where the middle area includes the center point of the current collecting plate 3 in the radial direction and the area at a certain distance from the center point in the radial direction, and the distance can be reasonably set according to actual needs. In this way, the middle area of ​​the current collecting plate 3 and the cover plate 12 are welded, so that one of the heat-conducting areas is in the middle area of ​​the current collecting plate 3, which is conducive to the heat around the heat-conducting area being evenly transferred to the heat-conducting area, and transferred to the cover plate 12 through the heat-conducting area, and the heat-conducting area can be prevented from interfering with the explosion-proof valve on the cover plate 12, for example, the explosion-proof valve is constructed so that its thickness is less than the thickness of other parts of the cover plate 12.

[0081] In some embodiments, in combination Figure 2 , Figure 4 , Figure 7 , Fig.11 and Fig.14 , the second heat-conducting structure 5 is located on the radial inner side of the boss 121 and is separated from the first heat-conducting structure 4, that is, the second heat-conducting structure 5 is located between the boss 121 and the first heat-conducting structure 4, and the radial spacing between the second heat-conducting structure 5 and the first heat-conducting structure 4 is greater than 5 mm. In this way, compared with the solution in which the heat at the edge of the electrode assembly 2 needs to be transferred to the middle when only the heat-conducting area formed by the first heat-conducting structure 4 is set, since the second heat-conducting structure 5 is located on the outer side of the first heat-conducting structure 4, the heat at the edge of the electrode assembly 2 can reach the second heat-conducting structure 5 faster and be transferred to the cover plate 12 through the second heat-conducting structure 5, shortening the length of the heat transfer path and greatly improving the heat dissipation efficiency. In addition, the second heat-conducting structure 5 is located on the radial inner side of the boss 121, so that the second heat-conducting structure 5 does not occupy the space in the height direction, and can also increase the heat dissipation area.

[0082] In some embodiments, reference Figure 7 and Fig.14 The second heat-conducting structure 5 is stacked between the boss 121 and the electrode assembly 2, that is, the second heat-conducting structure 5 is located on the side of the cover plate 12 along the axial direction of the battery 100. At this time, the boss 121 can be pressed on the second heat-conducting structure 5. Since the boss 121 itself has a certain thickness in the axial direction, it can fill a part of the gap between the cover plate 12 and the collecting plate 3, which is beneficial to reduce the thickness of the second heat-conducting structure 5 itself, save materials, and reduce costs. In addition, when the second heat-conducting structure 5 and the collecting plate 3 are stacked, the boss 121 can also be used to apply a certain pressure to the collecting plate 3 and the electrode assembly 2, so that their position inside the battery 100 is more stable, thereby improving the overall reliability of the battery 100.

[0083] In some embodiments, at least part of the second heat-conducting structure 5 along the radial direction is stacked with the collecting disk 3. For example, the second heat-conducting structure 5 as a whole is located on the upper side of the collecting disk 3, that is, the projection of the second heat-conducting structure 5 in the reference plane is located within the projection of the collecting disk 3 in the reference plane, and the reference plane is perpendicular to the axis of the collecting disk 3; or, a part of the second heat-conducting structure 5 along the radial direction is overlapped on the edge of the collecting disk 3. At this time, the part of the second heat-conducting structure 5 close to the inner side along the radial direction can be recessed along the axial direction to form a sink, and the edge of the collecting disk 3 is in the sink. In this way, the space occupied in the height direction can be reduced. In addition, a part of the second heat-conducting structure 5 is against the edge of the electrode assembly 2, so that the electrode assembly 2 can directly transfer heat to the second heat-conducting structure 5 through the pole ear 21, further shortening the length of the heat transfer path and improving the heat dissipation efficiency.

[0084] When the second heat-conducting structure 5 in this embodiment is a heat-conducting pad with a certain elasticity, the heat-conducting pad can be compressed to provide a rebound force to increase the effective contact area between the heat-conducting pad and the current collecting plate 3 and the cover plate 12 and reduce the surface thermal resistance.

[0085] In addition, the collector plate 3 can also be located radially inside the second heat-conducting structure 5, and the inner wall of the second heat-conducting structure 5 abuts against the peripheral wall of the collector plate 3. At this time, the second heat-conducting structure 5 is located between the pole ear 21 and the cover plate 12 of the electrode assembly 2. Compared with the second heat-conducting structure 5 being located between the collector plate 3 and the cover plate 12, the electrode assembly 2 can directly transfer heat to the second heat-conducting structure 5 through the pole ear 21, further shortening the length of the heat transfer path and improving the heat dissipation efficiency. In addition, since the second heat-conducting structure 5 and the collector plate 3 abut against each other radially, heat can also be transferred between the second heat-conducting structure 5 and the collector plate 3, which helps to improve the heat dissipation efficiency.

[0086] In some embodiments, the current collecting tray 3 may include a tray body 301 and a folded edge portion 302. The outer diameter of the tray body 301 is adapted to the inner diameter of the housing 11. For example, the outer diameter of the tray body 301 may be equal to the inner diameter of the housing 11, or slightly smaller than the inner diameter of the housing 11, so as to facilitate the assembly of the current collecting tray 3. One end of the folded edge portion 302 is connected to the edge of the tray body 301. At least part of the structure of the folded edge portion 302 extends in a direction parallel to the tray body 301. The folded edge portion 302 constitutes the second heat conducting structure 5. In other words, the folded edge portion 302 may be formed by bending the edge of the current collecting tray 3. After bending, the thickness of the corresponding part of the current collecting tray 3 is increased, so as to facilitate the contact with the cover plate 12 for heat dissipation. In addition, compared with the separate provision of heat conducting parts, the bending process is simpler and the current collecting tray 3 is easier to assemble.

[0087] For example, the folding portion 302 may include a first section and a second section, wherein the first section extends along the axial direction of the battery 100, or the first section may extend at an inclination, or the first section may be arc-shaped or in any other shape, and the second section extends along the radial direction of the battery 100 to facilitate contact with the cover plate 12, and the two ends of the first section are respectively connected to the edge of the disk body 301 and the second section. At this time, the folding portion 302 is roughly L-shaped. By setting the first section, the overall height of the folding portion 302 can be conveniently adjusted to facilitate contact with the cover plate 12. By adjusting the radial width of the second section, the contact area between the folding portion 302 and the cover plate 12 can be adjusted to maximize the heat conduction efficiency.

[0088] In some embodiments, an installation gap can be defined between the folded edge portion 302 and the disk body 301. The battery 100 also includes an elastic member (not shown in the figure), which is arranged in the installation gap. The two ends of the elastic member are respectively connected to the folded edge portion 302 and the disk body 301, for example, abutted. By providing the elastic member, the folded edge portion 302 has a certain elasticity. In this way, when the collecting disk 3 and the cover plate 12 are assembled, the cover plate 12 can apply a certain pressure to the folded edge portion 302, which is conducive to forming a larger contact area between the folded edge portion 302 and the disk body 301, improving the heat dissipation effect, and also helping to improve the installation stability of the collecting disk 3 and the electrode assembly 2.

[0089] Optionally, the elastic member may be a spring, or an elastic pad. In this way, the elastic member has a simple structure, is easy to assemble, and has a low cost.

[0090] Considering that the current collecting disk 3 is a circular structure, wrinkles are easily generated when its edge is folded to form the folded edge portion 302, resulting in an uneven surface of the current collecting disk 3, affecting the welding effect with the pole ear 21 and the space occupied by it. In order to avoid wrinkles during the folding process, in this embodiment, a plurality of avoidance notches 303 can be set at the edge of the current collecting disk 3, and the plurality of avoidance notches 303 are arranged at intervals along the circumference of the current collecting disk 3. The avoidance notches 303 can be set at the edge of the current collecting disk 3, for example, by forming the avoidance notches 303 through a stamping process, and then performing a folding process to form the folded edge portion 302. By setting the avoidance notches 303, it is possible to avoid mutual extrusion between different parts of the edge, thereby preventing wrinkles and reducing the difficulty of the process.

[0091] In order to achieve electrical conduction between the current collecting disk 3 and the cover plate 12, in addition to the above-mentioned scheme of welding the middle area of ​​the current collecting disk 3 and the cover plate 12 so that the first heat-conducting structure 4 is located in the middle area of ​​the current collecting disk 3. In other embodiments, the edge of the current collecting disk 3 can be welded to the boss 121 to form the first heat-conducting structure 4. In this way, the first heat-conducting structure 4 is located in the edge area of ​​the current collecting disk 3 and the cover plate 12, and the conduction between the current collecting disk 3 and the cover plate 12 can also be achieved, so that the cover plate 12 serves as the negative electrode of the battery 100. In addition, since the boss 121 is in contact with the side wall of the housing 11, the current path and the heat dissipation path can be shortened, and compared with the scheme of welding the middle area of ​​the current collecting disk 3 and the cover plate 12, the connection area of ​​the current collecting disk 3 and the cover plate 12 can be increased, so that the internal resistance when the current flows through the first heat-conducting structure 4 is smaller and the heat generation is also smaller.

[0092] In some embodiments, the side of the boss 121 facing away from the electrode assembly 2 includes a first groove 123, and the bottom wall of the first groove 123 is welded to the collector plate 3 to form a first heat-conducting structure 4. By providing the first groove 123, when laser penetration welding is adopted, the welding laser can be applied to the bottom wall of the first groove 123, and the heat can be quickly transmitted through the bottom wall to the collector plate 3, so that the boss 121 is welded to the edge of the collector plate 3, and the bulge formed at the weld mark portion can be prevented from protruding from the upper surface of the cover plate 12, causing the surface of the cover plate 12 to be uneven, thereby affecting the contact between the cover plate 12 and the heat dissipation cold plate of the thermal management system.

[0093] In some embodiments, the second heat-conducting structure 5 is disposed on the radial inner side of the boss 121, and the radial distance between the second heat-conducting structure 5 and the boss 121 is greater than 5 mm. In this case, the second heat-conducting structure 5 can be circular, annular or in any shape. In this way, a heat-conducting area is also disposed on the radial inner side of the boss 121, so that the bottom and side of the battery 100 can dissipate heat, and the heat dissipation efficiency is higher.

[0094] In some embodiments, the second heat-conducting structure 5 is disposed in the middle area of ​​the collecting plate 3, and the second heat-conducting structure 5 is welded to the cover plate 12. At this time, there are two welding points between the collecting plate 3 and the cover plate 12, and conduction is achieved through the two welding points, which is equivalent to two branches being connected in parallel. Since the parallel resistance is smaller than the series resistance, when the total current is the same, the total heat generation is reduced, which can reduce the heat dissipation pressure of the battery 100.

[0095] In some embodiments, in combination Figure 8 The current collecting plate 3 includes a current collecting plate body 31 and a first thickened portion, and the first thickened portion constitutes a first heat-conducting structure 4. That is, the thickness of the first heat-conducting structure 4 can be greater than the thickness of the remaining parts of the current collecting plate 3. By thickening the first heat-conducting structure 4, when the current collecting plate 3 and the cover plate 12 are connected by laser penetration welding, the current collecting plate 3 can be prevented from being welded through, thereby avoiding damage to the electrode assembly 2 and ensuring the welding quality.

[0096] It can be understood that when the collecting plate body 31 and the first thickened portion are made of the same material, the collecting plate body 31 and the first thickened portion can be an integrally formed structure; when the collecting plate body 31 and the second thickened portion are made of different materials, the collecting plate body 31 and the first thickened portion can be a composite integral structure.

[0097] In some embodiments, the material of the first thickened portion is the same as that of the cover plate 12. For example, the first thickened portion can be a generally used cold-rolled carbon steel sheet and steel strip (SPCC). In this way, the cover plate 12 and the first thickened portion have good conductivity and corrosion resistance. Of course, the utility model is not limited to this. The material of the first thickened portion and the cover plate 12 can also be other metal materials. By making the material of the first thickened portion the same as that of the cover plate 12, the two have the same melting point, and a relatively uniform weld mark can be formed during the cooling process of the molten pool after welding, thereby improving the welding quality. In addition, the requirements for the material of the main body of the collector plate 3 can be reduced, so that the main body of the collector plate 3 can be made of a different metal material from the cover plate 12 to fully improve its current capacity and reduce heat generation.

[0098] It can be understood that when the material of the collecting plate body 31 is different from that of the first thickened portion, for example, when the collecting plate body 31 is made of copper metal, since the first thickened portion is made of steel, the first thickened portion can be compounded to the collecting plate body 31 through a composite process to form a collecting plate 3 of a composite structure, that is, the collecting plate 3 is made of SPCC-Cu composite material, and the first thickened portion serves as one of the welding pads of the collecting plate 3 of the composite structure.

[0099] In some embodiments, the distance from the side surface of the first thickened portion facing the electrode assembly 2 to the outer surface of the cover plate 12 is the same as the distance from the side surface of the second heat-conducting structure 5 facing the electrode assembly 2 to the outer surface of the cover plate 12. In other words, the total thickness of the cover plate 12 and the current collecting plate 3 corresponding to the first thickened portion is the same as the total thickness of the corresponding portion of the second heat-conducting structure 5. In this way, the internal space of the battery 100 can be fully utilized to set the second heat-conducting structure 5, avoiding wasting the internal space of the battery 100 and improving space utilization.

[0100] In some embodiments, in combination Figure 8, the current collecting plate 3 also includes a second thickened portion, which constitutes a second heat-conducting structure 5, and the second thickened portion is welded to the cover plate 12. In other words, the thickness of the second heat-conducting structure 5 is greater than the thickness of the remaining parts of the current collecting plate 3 except the first heat-conducting structure 4 and the second heat-conducting structure 5. In this way, it is convenient to connect the second heat-conducting structure 5 with the cover plate 12 by laser penetration welding to prevent the current collecting plate 3 from being welded through, thereby avoiding damage to the electrode assembly 2 and improving the assembly yield. In addition, the first heat-conducting structure 4 and the second heat-conducting structure 5 are both connected to the cover plate 12 by welding, which is equivalent to the parallel connection of two branches. Since the total parallel resistance is less than the series resistance, under the condition of the same total current, the total heat generation of the two welding parts is reduced, which can alleviate the heat dissipation pressure.

[0101] It can be understood that when the collecting plate body 31 and the second thickened portion are made of the same material, the collecting plate body 31 and the second thickened portion can be an integrally formed structure; when the collecting plate body 31 and the second thickened portion are made of different materials, the collecting plate body 31 and the second thickened portion can be a composite integral structure.

[0102] In some embodiments, the material of the second thickened portion is the same as that of the cover plate 12. For example, the cover plate 12 and the second thickened portion can be generally used cold-rolled carbon steel sheets and steel strips (SPCC). In this way, the conductivity and corrosion resistance of the cover plate 12 and the second thickened portion are good. Of course, the utility model is not limited to this. The material of the second thickened portion and the cover plate 12 can also be other metal materials. By making the material of the second thickened portion the same as that of the cover plate 12, the melting points of the two are the same, and a relatively uniform weld mark can be formed during the cooling process of the molten pool after welding, thereby improving the welding quality. In addition, the requirements for the material of the main body of the collector plate 3 can be reduced, so that the main body of the collector plate 3 can be made of a different metal material from the cover plate 12 to fully improve its current capacity and reduce heat generation.

[0103] It can be understood that when the material of the collecting plate body 31 is different from that of the second thickened portion, for example, when the collecting plate body 31 is made of copper metal, since the second thickened portion is made of steel, the second thickened portion can be compounded to the collecting plate body 31 through a composite process to form a collecting plate 3 of a composite structure, that is, the collecting plate 3 is made of SPCC-Cu composite material, and the second thickened portion serves as one of the welding pads of the collecting plate 3 of the composite structure.

[0104] It can be understood that the SPCC layer is not provided in the area of ​​the current collecting plate 3 welded to the electrode tab 21 , so as to facilitate welding of the current collecting plate 3 and the copper electrode tab 21 .

[0105] In some embodiments, when both the first heat-conducting structure 4 and the second heat-conducting structure 5 are used to realize welding between the cover plate 12 and the current collecting plate 3, the welding area S1 corresponding to the second heat-conducting structure 5 located in the middle area of ​​the current collecting plate 3 and the welding area S2 corresponding to the first heat-conducting structure 4 located at the edge of the current collecting plate 3 satisfy: S1 / S2≤1 / 8.8.

[0106] When the middle and edge of the current collecting disk 3 are welded to the cover plate 12, it is equivalent to that there are two electrical connection points between the electrode assembly 2 and the cover plate 12, wherein the current path one is: the pole ear 21-the middle of the current collecting disk 3-the middle of the cover plate 12-the edge of the cover plate 12; the current path two is the pole ear 21-the edge of the current collecting disk 3-the edge of the cover plate 12, and the two current paths are connected in parallel and finally converge at the edge of the cover plate 12.

[0107] For current path 1, its equivalent resistance is approximately equal to the resistance of the cover plate 12, and for current path 2, its equivalent resistance is approximately equal to the internal resistance of the collector plate 3;

[0108] Cover 12 resistance / collector 3 resistance = ρ cover T disk / ρ disk T cover; ρ cover and ρ plate are the resistivity of the cover plate 12 and the current collecting plate 3 respectively; T plate and T cover are the thickness of the current collecting plate 3 and the main body of the cover plate 12 respectively;

[0109] The main body of the cover plate 12 is steel, and the main body of the current collecting plate 3 is copper. Substituting their corresponding resistivity and thickness, we can get: T disk / ρ disk Tcap≈8.8;

[0110] Then the current ratio passing through the cover plate 12 and the collecting plate 3 is: I1 / I2=Rplate / Rcover=1 / 8.8;

[0111] Assume that the welding area between the middle of the cover plate 12 and the current collecting plate 3 is S1, and the welding area between the edge of the cover plate 12 and the current collecting plate 3 is S2; if the current carrying capacity of the two welding points is to be the same, then I1 / S1 = I2 / S2; then, S1 / S2=I1 / I2= 1 / 8.8;

[0112] Considering the requirement of the battery 100 for heat dissipation efficiency, at the edge of the cover plate 12, due to the large current, the smaller S2 is, the faster the temperature rises; it is necessary to increase the area of ​​S2 to speed up heat dissipation; therefore, S2 should be increased, so under the premise of ensuring overcurrent, S1 / S2 can be less than 1 / 8.8,

[0113] When S1 / S2>1 / 8.8, the edge current capacity is weaker than the middle, and the heat dissipation capacity will also be insufficient.

[0114] In summary, when S1 / S2≤1 / 8.8, the heat dissipation capacity of the battery 100 can be fully guaranteed while ensuring the current-carrying capacity of the collecting plate 3 and the cover plate 12, thereby improving the performance of the battery 100.

[0115] refer to Figure 9-12 In addition to the solution of arranging the second heat-conducting structure 5 and the cover plate 12 in an axially stacked manner in the above-mentioned embodiment, the embodiment of the present application also provides another arrangement form of the second heat-conducting structure 5. Specifically, in the embodiment, the first heat-conducting structure 4 is arranged in the middle area of ​​the collecting plate 3, the second heat-conducting structure 5 is arranged at the edge of the collecting plate 3, the second heat-conducting structure 5 extends along the axial direction of the cover plate 12 toward one side of the cover plate 12, and the second heat-conducting structure 5 is embedded between the boss 121 and the outer shell 11. In this way, the boss 121 and the outer shell 11 can jointly clamp the second heat-conducting structure 5, and heat can be transferred from the second heat-conducting structure 5 to the cover plate 12 and the outer shell 11 respectively, further increasing the heat dissipation path and improving the heat dissipation efficiency. In addition, there is no need to occupy additional height space, the assembly is simple, and the tightness of the boss 121 and the outer shell 11 can also be increased.

[0116] Optionally, the second heat-conducting structure 5 may be a folded edge portion 302 formed by bending the edge of the current collecting plate 3. The folded edge portion 302 of this embodiment extends along the axial direction of the battery 100. The second heat-conducting structure 5 may be flush with the end of the housing 11 or may be lower than the end of the housing 11. In this way, the processing method of the second heat-conducting structure 5 is relatively simple, and it is easy to assemble, and the implementation cost is low.

[0117] In the above embodiment, in order to facilitate the use of laser penetration welding to weld the cover plate 12 and the current collecting plate 3, a second groove 124 can be set at the position of the cover plate 12 opposite to the first heat-conducting structure 4 (for example, the middle area of ​​the cover plate 12). By setting the second groove 124, the thickness of the cover plate 12 at the welding position is reduced. During welding, the welding equipment can be extended into the second groove 124 to act on the bottom wall of the second groove 124, so that the welding heat can be quickly transferred from the second groove 124 side of the cover plate 12 to the first heat-conducting structure 4, and then the heat can reach the current collecting plate 3, so as to smoothly complete the welding and ensure the welding quality. After the welding is completed, in order to ensure the flatness of the surface of the cover plate 12, the shell assembly 1 can also include a blocking cover 122. After the current collecting plate 3 and the cover plate 12 are welded, the blocking cover 122 can be sealed in the second groove 124, and the blocking cover 122 can be flush with the end face of the cover plate 12 or smoothly transition. This makes it easy to connect the cover plate 12 to the external circuit, and at the same time, ensures the consistency of the appearance of the battery 100. At this time, the heat transferred to the cover plate 12 through the first heat-conducting structure 4 can have three heat-conducting paths, that is, the blocking cover 122 is one of them, the part of the cover plate 12 adjacent to the first heat-conducting structure 4 is one, and the part of the cover plate 12 contacting the second heat-conducting structure 5 is another. In this way, the heat dissipation paths are further increased and the heat dissipation efficiency is improved.

[0118] refer to Fig.15 In addition to the above-mentioned solution of realizing electrical connection between the pole lug 21 and the cover plate 12 through the current collecting plate 3, the embodiment of the present application also provides another electrical connection method between the pole lug 21 and the cover plate 12. Specifically, in the present embodiment, the pole lug 21 and the cover plate 12 are electrically connected through the first heat conducting structure 4. In other words, the current collecting plate is not provided in the present embodiment, and the first heat conducting structure 4 realizes both electrical connection between the pole lug 21 and the cover plate 12 and heat conduction between the pole lug 21 and the cover plate 12. In this way, compared with the solution of providing the current collecting plate 3, it is possible to reduce parts and reduce costs, while saving the internal space of the battery 100, which is conducive to improving the energy density of the battery 100, and can further shorten the heat transfer path, thereby improving the heat dissipation efficiency.

[0119] In some embodiments, reference Fig.15 The cover plate 12 and the pole lug 21 are welded to form a first heat-conducting structure 4, that is, the cover plate 12 and the pole lug 21 are directly connected, and the second heat-conducting structure 5 can be arranged in the gap between the cover plate 12 and the pole lug 21. In this way, the heat transfer path can be further shortened, thereby improving the heat dissipation efficiency, saving the internal space occupied by the collecting plate, and being beneficial to improving the energy density of the battery 100.

[0120] In a specific example, the battery 100 is a cylindrical battery, so the battery 100 has a relatively simple structure and is easy to manufacture.

[0121] Furthermore, the housing 11 includes a top wall 111 opposite to the cover plate 12 and a side wall 112 surrounding the top wall 111, the top wall 111 and the side wall 112 are integrally formed, the battery 100 may also include a pole 6, the pole 6 is penetrated through the top wall, the end of the electrode assembly 2 facing the pole 6 includes a positive pole ear 21, the pole 6 is electrically connected to the positive pole ear 21, for example, the positive pole ear 21 and the pole 6 are electrically connected by welding the positive current collector. The pole ear 21 at the end of the electrode assembly 2 facing the cover plate 12 is a negative pole ear 21, and the cover plate 12 is electrically connected to the negative pole ear 21. In other words, the housing 11 in this embodiment can be negatively charged. In this way, the structure of the battery 100 is relatively simple and easy to manufacture.

[0122] It should also be noted that the electrical device provided in the embodiment of the present application, by setting the battery 100 in the above embodiment, has a high heat dissipation efficiency, which helps to alleviate the overall heat dissipation pressure of the electrical device and is more suitable for system-level thermal management requirements.

[0123] It should be noted that the embodiments represented by "one embodiment", "an embodiment", "an exemplary embodiment", "some embodiments", etc. mentioned in the specification may include specific features, structures or characteristics, but not every embodiment may include the specific features, structures or characteristics. In addition, such phrases do not necessarily refer to the same embodiment. In addition, when describing specific features, structures or characteristics in conjunction with an embodiment, it is within the knowledge of those skilled in the art to implement such features, structures or characteristics in conjunction with other embodiments that are explicitly or not explicitly described.

[0124] In general, terms should be understood, at least in part, by the context in which they are used. For example, the term "one or more" as used herein may be used to describe any feature, structure, or characteristic in a singular sense, or may be used to describe a combination of features, structures, or characteristics in a plural sense, depending, at least in part, on the context. Similarly, terms such as "a," "an," or "the" may also be understood to convey singular usage or to convey plural usage, depending, at least in part, on the context.

[0125] It should be easily understood that “on,” “above,” and “over” in the present disclosure should be interpreted in the broadest manner, so that “on” not only means “directly on something,” but also includes the meaning of “on something” with intervening features or layers therebetween, and “above” or “over” not only includes the meaning of “above” or “over,” but also may include the meaning of “above” or “over something” with no intervening features or layers therebetween (i.e., directly on something).

[0126] In addition, spatially relative terms, such as "below," "below," "beneath," "above," "above," etc., may be used herein for ease of description to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation shown in the figures. The device may have other orientations (rotated 90 degrees or at other orientations), and the spatially relative descriptors used herein may likewise be interpreted accordingly.

[0127] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery, characterized in that: include: The housing assembly comprises a housing and a cover plate, wherein an opening is provided at one end of the housing along the axial direction, and the cover plate seals the opening; An electrode assembly is disposed in the inner cavity of the shell, and an electrode ear is disposed at one end of the electrode assembly facing the cover plate; The electrode tab is electrically connected to the cover plate, and a first heat-conducting structure and a second heat-conducting structure are included between the electrode tab and the cover plate. The first heat-conducting structure and the second heat-conducting structure are arranged at intervals along the radial direction of the cover plate, and the first heat-conducting structure and the second heat-conducting structure transfer the heat generated on the electrode assembly to the cover plate.

2. The battery according to claim 1, characterized in that The cover plate includes a boss protruding toward one side of the electrode assembly, and the outer diameter of the boss is adapted to the inner diameter of the shell, and the boss is embedded in the opening.

3. The battery according to claim 2, characterized in that The battery further includes: a current collecting plate, which is welded to the cover plate and the tab respectively, and the welding point between the current collecting plate and the cover plate constitutes the first heat conducting structure.

4. The battery according to claim 3, characterized in that The second heat-conducting structure is in heat-conducting contact with the collecting plate and the cover plate respectively.

5. The battery according to claim 3, characterized in that The second heat-conducting structure is fixedly connected to at least one of the current collecting plate and the cover plate.

6. The battery according to claim 5, characterized in that The second heat-conducting structure is integrally formed with the current collecting disk.

7. The battery according to any one of claims 1 to 6, characterized in that The second heat-conducting structure is at least one of a heat-conducting adhesive, a heat-conducting pad and a metal piece.

8. The battery according to claim 7, characterized in that The value range of the thermal conductivity coefficient t of the second heat-conducting structure is: t>20W / mK.

9. The battery according to any one of claims 3 to 6, characterized in that: The boss is formed at the edge of the cover plate, and the boss is an annular boss. The middle area of ​​the collecting plate is welded to the cover plate to form the first heat-conducting structure.

10. The battery according to claim 9, characterized in that The second heat-conducting structure is located radially inward of the boss, and a radial distance between the second heat-conducting structure and the first heat-conducting structure is greater than 5 mm.

11. The battery according to claim 9, characterized in that The second heat-conducting structure is stacked and arranged between the boss and the electrode assembly.

12. The battery according to claim 9, characterized in that At least a portion of the second heat-conducting structure in the radial direction is stacked with the current collecting disk; or, The current collecting disk is located radially inward of the second heat conducting structure, and the inner wall of the second heat conducting structure abuts against the peripheral wall of the current collecting disk.

13. The battery according to claim 11, characterized in that The current collecting disk comprises a disk body and a folded edge portion, wherein the disk body is electrically connected to the pole ear, one end of the folded edge portion is connected to the edge of the disk body, and at least a part of the structure of the folded edge portion extends in a direction parallel to the disk body. The folded edge portion constitutes the second heat conducting structure.

14. The battery according to claim 13, characterized in that An installation gap is defined between the folded edge portion and the disk body. The battery further includes an elastic member, which is disposed in the installation gap. Two ends of the elastic member are respectively in contact with the folded edge portion and the disk body.

15. The battery according to any one of claims 3 to 6, characterized in that: The boss is formed on the edge of the cover plate, the boss is an annular boss, and the edge of the collecting plate is welded to the boss to form the first heat-conducting structure.

16. The battery according to claim 15, characterized in that The side of the boss facing away from the electrode assembly includes a first groove, and the bottom wall of the first groove is welded to the current collecting plate to form the first heat conducting structure.

17. The battery according to claim 15, characterized in that The second heat-conducting structure is arranged on the radial inner side of the boss, and the radial distance between the second heat-conducting structure and the boss is greater than 5 mm.

18. The battery according to claim 15, characterized in that The second heat-conducting structure is arranged in the middle area of ​​the collecting plate, and the second heat-conducting structure is welded to the cover plate.

19. The battery according to claim 5, characterized in that The collecting plate includes a first thickened portion and a second thickened portion. The first thickened portion is welded to the cover plate to form the first heat-conducting structure, and the second thickened portion is welded to the cover plate to form the second heat-conducting structure.

20. The battery according to claim 19, characterized in that The material of the first thickened portion is the same as that of the cover plate; and / or the material of the second thickened portion is the same as that of the cover plate.

21. The battery according to claim 18, characterized in that The welding area corresponding to the second heat-conducting structure is S1, and the welding area corresponding to the first heat-conducting structure is S2. S1 and S2 satisfy: S1 / S2≤1 / 8.

8.

22. The battery according to any one of claims 3 to 6, characterized in that: The first heat-conducting structure is arranged in the middle area of ​​the collecting disk, the second heat-conducting structure is arranged at the edge of the collecting disk, the second heat-conducting structure extends along the axial direction of the cover plate toward one side of the cover plate, and the second heat-conducting structure is embedded between the boss and the shell.

23. The battery according to claim 1, characterized in that The tab and the cover plate are electrically connected via the first heat-conducting structure.

24. The battery according to claim 23, characterized in that The cover plate and the tab are welded to form the first heat-conducting structure.

25. The battery according to claim 1, characterized in that The battery is a cylindrical battery.

26. The battery according to claim 25, characterized in that The outer shell includes a top wall opposite to the cover plate and a side wall surrounding the top wall, the top wall and the side wall are integrally formed, and the side wall defines the opening; the battery also includes a pole, the pole is passed through the top wall, the end of the electrode assembly facing the pole includes a positive pole ear, the pole is electrically connected to the positive pole ear, the pole ear at the end of the electrode assembly facing the cover plate is a negative pole ear, and the outer shell is electrically connected to the negative pole ear.

27. An electrical device, characterized in that: include: The battery according to any one of claims 1 to 26.

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