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 a heat conduction structure and a heat conduction pad are arranged between the tab and the cover plate, the heat conduction structure and the heat conduction pad are arranged at an interval along the radial direction of the cover plate, the heat conduction structure and the heat conduction pad transmit heat generated on the tab to the cover plate, and the heat conduction structure is electrically connected with the tab and the cover plate. According to the utility model, at least two heat conduction areas exist among the battery, the electrode assembly and the cover plate, so that a heat conduction path is increased, the heat dissipation efficiency of the battery is favorably improved, the heat dissipation mode of the battery is more suitable for the system-level heat management requirement, and the application range of the battery is expanded.

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] With the development of social economy, 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 conduction areas 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 a heat-conducting structure and a heat-conducting pad are provided between the pole ear and the cover plate, the heat-conducting structure and the heat-conducting pad are arranged at intervals along the radial direction of the cover plate, the heat-conducting structure and the heat-conducting pad transfer the heat generated on the pole ear to the cover plate, and the heat-conducting structure electrically connects the pole ear and the cover plate.

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

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

[0008] In some embodiments, the heat conductive structure is located in a middle region of the collecting plate.

[0009] In some embodiments, the thermally conductive pad is stacked between the annular boss and the electrode assembly.

[0010] In some embodiments, the edge of the collecting plate is welded to the annular boss to form the heat conducting structure.

[0011] In some embodiments, the side of the annular 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 heat conducting structure.

[0012] In some embodiments, the thermal pad is disposed in a middle region of the collecting plate.

[0013] In some embodiments, a thickened portion is formed on the collecting plate, and the thickened portion is welded to the cover plate to form the heat-conducting structure.

[0014] In some embodiments, the material of the thickened portion is the same as that of the cover plate.

[0015] In some embodiments, the cover plate and the tab are welded to form the heat conducting structure.

[0016] In some embodiments, the battery is a cylindrical battery.

[0017] In some embodiments, the end of the shell opposite to the cover plate includes a top plate, the battery also includes a pole, the pole is passed through the top plate, 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 shell is electrically connected to the negative pole ear.

[0018] The utility model also provides an electrical device, comprising: the battery described in the first aspect of the utility model.

[0019] According to the battery of the utility model, a heat-conducting structure and a heat-conducting pad are provided between the electrode assembly and the cover plate, so that there are at least two heat-conducting areas between the collecting plate and the cover plate, the heat conduction path is increased, and the temperature field distribution on the cover plate side is optimized, which helps to improve the heat dissipation efficiency of the battery and makes the battery heat dissipation method more suitable for system-level thermal management requirements, thereby expanding the application range of the battery, and the overall implementation method is relatively simple and easy to implement. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] 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.

[0021] Figure 1 It is a schematic diagram of the structure of batteries in some embodiments of the utility model;

[0022] Figure 2 For along Figure 1The cross-sectional view of the AA section, Figure 2 The middle heat conducting structure is located on the inner side of the thermal pad;

[0023] Figure 3 It is a schematic diagram of the structure of batteries in some embodiments of the utility model;

[0024] Figure 4 For along Figure 3 Sectional view of the CC section;

[0025] Figure 5 for Figure 4 The enlarged view of the area D is shown in the middle circle. Figure 5 The middle thermal pad is located on the inner side of the thermal structure;

[0026] Figure 6 It is a schematic diagram of the coordination of the current collecting plate, the heat conducting structure and the heat conducting pad in some embodiments of the utility model;

[0027] Figure 7 It is a schematic diagram of the structure of batteries in some embodiments of the utility model;

[0028] Figure 8 For along Figure 7 Cross-sectional view of the middle GG section;

[0029] Fig. 9 This is a schematic diagram of the structure of batteries in some embodiments of the utility model. Fig. 9 The pole ear of the electrode assembly is welded to the cover plate to form a heat-conducting structure.

[0030] Description of reference numerals:

[0031] 100-battery;

[0032] 1- Shell assembly;

[0033] 11-housing; 12-cover plate; 121-annular boss; 122-blocking cover; 123-first groove; 124-second groove;

[0034] 2-electrode assembly; 21-electrode ear;

[0035] 3- Collecting plate;

[0036] 31-Current plate body;

[0037] 4-Heat conduction structure;

[0038] 5- Thermal pad. DETAILED DESCRIPTION

[0039] 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.

[0040] With the development of social economy, 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.

[0041] 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.

[0042] 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., which is not limited in the embodiments of the present application. The battery mentioned in the embodiments of the present application may include one or more battery cells to provide a single physical module with higher voltage and capacity. When there are multiple battery cells, the multiple battery cells are connected in series, in parallel, or in mixed connection through a busbar.

[0043] 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 formed by the welding area between the collector plate and the cover plate. 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.

[0044] In view of this, this embodiment provides a battery 100, referring to Figure 1-Figure 8 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 along the axial direction. The cover plate 12 is sealed at the opening. The cover plate 12 may be a negative electrode cover plate 12.

[0045] The electrode assembly 2 may include a positive electrode sheet, a negative electrode sheet and a separator, which are stacked and wound in sequence to form the electrode assembly 2, that is, the electrode assembly 2 is a wound battery cell. The electrode assembly 2 is disposed in the inner cavity of the housing 11, and a pole ear is disposed at one end of the electrode assembly 2.

[0046] 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 .

[0047] A heat-conducting structure 4 and a heat-conducting pad 5 are provided between the pole tab 21 and the cover plate 12. The heat-conducting structure 4 and the heat-conducting pad 5 are arranged at intervals along the radial direction of the cover plate 12. The heat-conducting structure 4 and the heat-conducting pad 5 can transfer the heat generated on the pole tab 21 to the cover plate 12. 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. In addition, the heat-conducting structure 4 electrically connects the pole tab 21 and the cover plate 12.

[0048] According to the battery 100 of the embodiment of the utility model, a heat-conducting structure 4 and a heat-conducting pad 5 are provided between the electrode assembly 2 and the cover plate 12, so that there are at least two heat-conducting areas between the collecting plate 3 and the cover plate 12, which increases the heat conduction path and optimizes the temperature field distribution on the cover plate 12 side, which helps to improve the heat dissipation efficiency of the battery 100, and makes the heat dissipation method of the battery 100 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.

[0049] In addition, when the thermal pad 5 is an elastic member with a certain elasticity, it can be compressed to provide a rebound force to increase the effective contact area between it and the collecting plate 3 and the cover plate 12, thereby reducing the surface thermal resistance.

[0050] In some embodiments, reference Figure 2 , Figure 5 and Figure 8, the cover plate 12 is provided with an annular boss 121 on the side facing the electrode assembly 2, that is, the annular boss 121 protrudes from the inner surface of the cover plate 12, the annular boss 121 extends along the circumference of the cover plate 12, and the annular boss 121 is arranged adjacent to the edge of the cover plate 12. For example, the annular boss 121 can be formed by bending the inner surface and the outer surface of the cover plate 12 toward the inside of the battery 100. In this case, the portion of the outer surface of the cover plate 12 corresponding to the annular boss 121 is formed into a groove-like structure; or, the annular 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 this case, the portion of the outer surface of the cover plate 12 corresponding to the annular boss 121 can be formed into a plane, or a concave-convex structure can be provided as required; the annular boss 121 can be formed into a complete circular ring, or it can include a plurality of boss segments spaced apart along the circumference. The outer diameter of the annular boss 121 is adapted to the inner diameter of the housing 11, and the annular boss 121 is embedded in the opening.

[0051] The cover plate 12 is fixed to the housing 11 by embedding the annular boss 121 into the opening. In some possible embodiments, the annular 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 annular boss 121 and the housing 11 to achieve a tight connection between the annular 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.

[0052] A rib is provided radially outwardly of the annular boss 121 , and the rib abuts against the end of the shell 11 to prevent the cover plate 12 from sinking entirely into the inner cavity of the shell 11 . In addition, when the cover plate 12 and the shell 11 are welded, the rib can also provide a welding position.

[0053] The battery 100 may also include a current collecting plate 3, which is disposed at one end of the electrode assembly 2, and is welded to the pole lug 21, and is welded to the cover plate 12, wherein the welding portion between the current collecting plate 3 and the cover plate 12 constitutes a 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 a heat conducting area. On this basis, it is only necessary to additionally provide a heat conducting pad 5 to achieve multi-path heat dissipation between the current collecting plate 3 and the cover plate 12, and the implementation method is relatively simple and easy to implement, and the heat conducting pad 5 helps to optimize the temperature field distribution.

[0054] Since the positive electrode side of the electrode assembly 2 is usually connected to the positive electrode current collecting plate, 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.

[0055] Optionally, the annular boss 121 may directly abut against the edge of the current collecting plate 3 , so that the annular boss 121 may also serve as a heat conduction area.

[0056] In some embodiments, reference Figure 2 , the heat-conducting structure 4 is located in the middle area of ​​the collecting plate 3, where the middle area includes the center point of the 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 collecting plate 3 and the middle area of ​​the cover plate 12 are welded, so that one of the heat-conducting areas is in the middle area of ​​the 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.

[0057] In some embodiments, the thermal pad 5 is located radially inside the annular boss 121 and is separated from the thermal conductive structure 4, that is, the thermal pad 5 is located between the annular boss 121 and the thermal conductive structure 4, and the radial spacing between the thermal pad 5 and the thermal conductive structure 4 is greater than 5 mm. In this way, compared with the solution in which only the thermal conductive area formed by the thermal conductive structure 4 is provided, the heat at the edge of the electrode assembly 2 needs to be transferred to the middle. Since the thermal pad 5 is located outside the thermal conductive structure 4, the heat at the edge of the electrode assembly 2 can reach the thermal pad 5 faster and be transferred to the cover plate 12 through the thermal pad 5, shortening the length of the heat transfer path and greatly improving the heat dissipation efficiency. In addition, the thermal pad 5 is located radially inside the annular boss 121, so that the thermal pad 5 does not occupy space in the height direction and can also increase the heat dissipation area.

[0058] In some embodiments, reference Figure 2 The thermal pad 5 is stacked between the annular boss 121 and the electrode assembly 2, that is, the thermal pad 5 is located on one side of the cover plate 12 along the axial direction of the battery 100. At this time, the annular boss 121 can be pressed on the thermal pad 5. Since the annular 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 thermal pad 5 itself, save materials, and reduce costs. In addition, when the thermal pad 5 and the collecting plate 3 are stacked, the annular 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.

[0059] In some embodiments, at least part of the structure of the thermal pad 5 along the radial direction is stacked with the collecting disk 3. For example, the thermal pad 5 as a whole may be located on the upper side of the collecting disk 3, that is, the projection of the thermal pad 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 thermal pad 5 along the radial direction may overlap the edge of the collecting disk 3. At this time, the part of the thermal pad 5 close to the inner side along the radial direction may 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 thermal pad 5 abuts against the edge of the electrode assembly 2, so that the electrode assembly 2 can directly transfer heat to the thermal pad 5 through the pole ear, further shortening the length of the heat transfer path and improving the heat dissipation efficiency.

[0060] In addition, the collector plate 3 can also be located radially inside the thermal pad 5, and the inner wall of the thermal pad 5 abuts against the peripheral wall of the collector plate 3. At this time, the thermal pad 5 is located between the pole ear and the cover plate 12 of the electrode assembly 2. Compared with the thermal pad 5 being located between the collector plate 3 and the cover plate 12, the electrode assembly 2 can directly transfer heat to the thermal pad 5 through the pole ear, further shortening the length of the heat transfer path and improving the heat dissipation efficiency. In addition, since the thermal pad 5 and the collector plate 3 abut against each other in the radial direction, heat can also be transferred between the thermal pad 5 and the collector plate 3, which helps to improve the heat dissipation efficiency.

[0061] In order to achieve electrical conduction between the current collecting plate 3 and the cover plate 12, in addition to the above-mentioned solution of welding the central area of ​​the current collecting plate 3 and the cover plate 12 so that the heat conducting structure 4 is located in the central area of ​​the current collecting plate 3. Figure 5 In other embodiments, the edge of the collecting disk 3 can be welded to the annular boss 121 to form a heat-conducting structure 4. In this way, the heat-conducting structure 4 is located in the edge area of ​​the collecting disk 3 and the cover plate 12, and conduction between the 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 annular boss 121 is in contact with the side wall of the outer shell 11, the current path and the heat dissipation path can be shortened. In addition, compared with the solution of welding the collecting disk 3 and the middle area of ​​the cover plate 12, the connection area of ​​the collecting disk 3 and the cover plate 12 can be increased, so that the internal resistance when the current flows through the heat-conducting structure 4 is smaller and the heat generation is also smaller.

[0062] In some embodiments, the side of the annular 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 current collecting plate 3 to form a heat-conducting structure 4. By setting the first groove 123, when laser penetration welding is adopted, the welding equipment can be extended into the first groove 123 to act on the bottom wall of the first groove 123, and the heat can be quickly transmitted through the bottom wall to the current collecting plate 3, so that the annular boss 121 is welded to the edge of the current collecting 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, and affecting the contact between the cover plate 12 and the heat dissipation cold plate of the thermal management system.

[0063] In some embodiments, reference Figure 5 The heat conducting pad 5 is arranged on the radial inner side of the annular boss 121, and the radial distance between the heat conducting pad 5 and the annular boss 121 is greater than 5 mm. In this case, the heat conducting pad 5 can be circular, annular or any shape. In this way, a heat conducting area is also arranged on the radial inner side of the annular boss 121, so that the bottom and side of the battery 100 can dissipate heat, and the heat dissipation efficiency is higher.

[0064] In some embodiments, in combination Figure 6 The current collecting plate 3 includes a current collecting plate body 31 and a thickened portion, that is, the thickness of the thickened portion can be greater than the thickness of the remaining parts of the current collecting plate 3, and the thickened portion is welded with the cover plate 12 to form a heat conducting structure 4. By thickening the 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 preventing the electrode assembly 2 from being damaged and ensuring the welding quality.

[0065] It can be understood that when the collecting plate body 31 and the thickened portion are made of the same material, the collecting plate body 31 and the 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 thickened portion can be a composite integral structure.

[0066] In some embodiments, the material of the thickened portion is the same as that of the cover plate 12. For example, the 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 thickened portion have good conductivity and corrosion resistance. Of course, the utility model is not limited to this. The material of the thickened portion and the cover plate 12 can also be other metal materials. By making the material of the 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.

[0067] It can be understood that when the material of the collecting plate body 31 is different from that of the thickened portion, for example, when the collecting plate body 31 is made of copper metal, since the thickened portion is made of steel, the 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 thickened portion serves as one of the welding pads of the collecting plate 3 of the composite structure.

[0068] In some embodiments, the distance from the side surface of the 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 thermal pad 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 at the corresponding portion of the thickened portion is the same as the total thickness of the corresponding portion of the thermal pad 5. In this way, the internal space of the battery 100 can be fully utilized to set the thermal pad 5, avoiding wasting the internal space of the battery 100 and improving space utilization.

[0069] In the above embodiment, in order to facilitate the use of laser penetration welding to weld the cover plate 12 and the heat-conducting structure 4 of the collecting plate 3, a second groove 124 can be set at the position of the cover plate 12 opposite to the 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 one side of the second groove 124 of the cover plate 12 to the heat-conducting structure 4, and then the heat can reach the collecting plate 3 to complete the welding smoothly and ensure the welding quality. After the welding is completed, if the flatness of the surface of the cover plate 12 is not guaranteed, the shell assembly 1 can also include a blocking cover 122. After the welding of the collecting plate 3 and the cover plate 12 is completed, 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 heat-conducting structure 4 can have three heat-conducting paths, namely, the blocking cover 122 as one of the paths, the part of the cover plate 12 adjacent to the heat-conducting structure 4 as one, and the part of the cover plate 12 contacting the heat-conducting pad 5 as another, thus further increasing the heat dissipation paths and improving the heat dissipation efficiency.

[0070] refer to Fig. 9In 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 this embodiment, the pole lug 21 and the cover plate 12 are electrically connected through the heat conducting structure 4. In other words, the current collecting plate is not provided in this embodiment, and the 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.

[0071] In some embodiments, reference Fig. 9 The cover plate 12 and the pole lug 21 are welded to form a heat-conducting structure 4, that is, the cover plate 12 and the pole lug 21 are directly connected, and the thermal pad 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.

[0072] 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.

[0073] Further, the end of the shell 11 opposite to the cover plate 12 may include a top plate, for example, the top wall of the shell 11 constitutes the top plate, and the battery 100 may also include a pole, the pole is penetrated through the top plate, and the end of the electrode assembly 2 facing the pole includes a positive pole ear 21, and the pole is electrically connected to the positive pole ear 21, for example, the positive pole ear 21 and the pole 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 shell 11 is electrically connected to the negative pole ear 21. In other words, the shell 11 in this embodiment can be negatively charged. In this way, the structure of the battery 100 is relatively simple and easy to manufacture.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] 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).

[0078] 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.

[0079] 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; Among them, a heat-conducting structure and a heat-conducting pad are included between the pole lug and the cover plate, and the heat-conducting structure and the heat-conducting pad are arranged at intervals along the radial direction of the cover plate. The heat-conducting structure and the heat-conducting pad transfer the heat generated on the pole lug to the cover plate, and the heat-conducting structure electrically connects the pole lug and the cover plate.

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

3. The battery according to claim 2, characterized in that Also includes: A 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 heat conducting structure.

4. The battery according to claim 3, characterized in that The heat-conducting structure is located in the middle area of ​​the collecting plate.

5. The battery according to claim 3, characterized in that The thermal conductive pad is stacked and arranged between the annular boss and the electrode assembly.

6. The battery according to claim 3, characterized in that The edge of the collecting plate is welded to the annular boss to form the heat conducting structure.

7. The battery according to claim 6, characterized in that The side of the annular boss facing away from the electrode assembly comprises a first groove, and the bottom wall of the first groove is welded to the current collecting plate to form the heat conducting structure.

8. The battery according to claim 6, characterized in that The thermal conductive pad is arranged in the middle area of ​​the current collecting plate.

9. The battery according to claim 4, characterized in that The current collecting plate comprises a thickened portion, and the thickened portion is welded to the cover plate to form the heat conducting structure.

10. The battery according to claim 9, characterized in that The material of the thickened portion is the same as that of the cover plate.

11. The battery according to claim 1, characterized in that The cover plate and the tab are welded to form the heat-conducting structure.

12. The battery according to any one of claims 1 to 11, characterized in that The battery is a cylindrical battery.

13. The battery according to claim 12, characterized in that The end of the shell opposite to the cover plate includes a top plate, and the battery also includes a pole, which is passed through the top plate. The end of the electrode assembly facing the pole includes a positive pole ear, and 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 shell is electrically connected to the negative pole ear.

14. An electrical device, characterized in that: include: The battery according to any one of claims 1 to 13.

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