Battery monomer, battery device and electric device

Abstract

The utility model discloses a battery monomer, a battery device and a power utilization device. The battery monomer comprises a shell, an electrode assembly and a heat conduction assembly, the electrode assembly is located in the shell; the heat conduction assembly comprises a heat conduction plate located in the shell, the heat conduction plate defines a containing cavity, a heat conduction medium is contained in the containing cavity, and at least part of the heat conduction plate is in heat conduction connection with the electrode assembly and the shell. Heat generated in the charging and discharging process of the electrode assembly can be transmitted to the heat-conducting medium through the heat-conducting plate, the overheating risk of the electrode assembly is reduced, and the reliability of the battery monomer is improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery cell, battery device, and power supply device. Background Technology

[0002] With the development of new energy technologies, battery cells are being used more and more widely, for example in mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools.

[0003] During the charging and discharging process of a battery, individual battery cells may overheat. Improving the reliability of individual battery cells is an important research direction in the field of batteries. Utility Model Content

[0004] This application provides a battery cell, a battery device, and an electrical device that can improve the reliability of the battery cell.

[0005] In a first aspect, this application provides a battery cell, including: a housing, an electrode assembly, and a heat-conducting assembly; the electrode assembly is located inside the housing; the heat-conducting assembly includes a heat-conducting plate located inside the housing, the heat-conducting plate enclosing a cavity, the cavity containing a heat-conducting medium, and at least a portion of the heat-conducting plate being heat-conductingly connected to the electrode assembly and the housing.

[0006] In this embodiment, the heat generated by the electrode assembly during charging and discharging can be transferred to the heat-conducting medium through the heat-conducting plate, reducing the risk of overheating of the electrode assembly. Furthermore, the heat-conducting plate is thermally connected to the casing, allowing the heat from the heat-conducting medium and plate to dissipate through the casing, thus improving the heat dissipation capacity of the battery cell. When the electrode assembly needs to be heated, heat is transferred through the casing to the heat-conducting plate and medium, and then through the heat-conducting plate to the electrode assembly. This rapidly increases the temperature of the electrode assembly, improves temperature management efficiency, increases the continuous charge-discharge rate of the battery cell, and ultimately enhances the reliability of the battery cell.

[0007] According to some embodiments of this application, the electrode assembly includes an electrode body and a tab. The electrode body includes a first end face and a second end face disposed opposite to each other in a first direction, and a side face connected between the first end face and the second end face. The tab is connected to at least one of the first end face and the second end face. A heat-conducting plate is disposed on at least part of the side face and is thermally connected to the side face, which is beneficial for heat transfer between the heat-conducting plate and the electrode body.

[0008] According to some embodiments of this application, the height of the heat-conducting plate along the first direction is less than the height of the electrode body along the first direction, which leaves more space for electrode tab connection.

[0009] According to some embodiments of this application, the height of the heat-conducting plate along the first direction is equal to the height of the electrode body along the first direction, which can increase the contact area between the heat-conducting plate and the electrode body and improve the heat transfer efficiency.

[0010] According to some embodiments of this application, at least a portion of the heat-conducting plate is located between the electrode assembly and the housing, and together with the housing, forms a receiving cavity. A heat-conducting medium is disposed within the receiving cavity, which facilitates the dissipation of heat from the heat-conducting medium from the housing to the outside of the battery cell. Simultaneously, when the battery cell is heated, heat can also be effectively transferred from the housing to the heat-conducting medium.

[0011] According to some embodiments of this application, the heat-conducting plate includes a first heat-conducting plate disposed between the electrode assembly and the housing, and the receiving cavity includes a first receiving cavity jointly enclosed by the first heat-conducting plate and the housing. A heat-conducting medium is disposed within the first receiving cavity, which facilitates the transfer of heat between the first heat-conducting plate and the housing.

[0012] According to some embodiments of this application, the battery cell includes at least two electrode assemblies arranged side by side along a second direction, the heat-conducting plate also includes a second heat-conducting plate located between two adjacent electrode assemblies, and the receiving cavity includes a second receiving cavity formed by the second heat-conducting plate, and a second heat-conducting medium is disposed in the second receiving cavity, which is beneficial to improving the heat dissipation effect of the electrode assembly.

[0013] According to some embodiments of this application, the first receiving cavity is connected to the second receiving cavity, and the heat-conducting medium can also flow between the first receiving cavity and the second receiving cavity to improve the heat transfer effect.

[0014] According to some embodiments of this application, the first heat-conducting plate includes a plurality of first heat-conducting sub-plates located on at least one side of the electrode assembly in a third direction. Each first heat-conducting sub-plate is connected to the end of the second heat-conducting plate in the third direction, and the second direction intersects with the third direction. The connection of the first heat-conducting sub-plates to the end of the second heat-conducting plate in the third direction can improve the thermal conductivity between the first heat-conducting sub-plates and the second heat-conducting plate, and also improve the structural strength of the first heat-conducting sub-plates and the second heat-conducting plate, thereby improving the structural rigidity of the battery cell.

[0015] According to some embodiments of this application, two second heat-conducting plates are spaced apart along a second direction to enclose and form a second receiving cavity and a gap communicating with the first receiving cavity. Each second heat-conducting plate is connected to each first heat-conducting sub-plate so that the first receiving cavity and the second receiving cavity are interconnected through the gap, so that the heat-conducting medium can flow between the first receiving cavity and the second receiving cavity through the gap.

[0016] According to some embodiments of this application, the heat-conducting plate includes a plurality of first heat-conducting grooves located on the side of the first heat-conducting subplate facing the first receiving cavity, the plurality of first heat-conducting grooves extending radially from the middle of the side of the first heat-conducting subplate near the gap to the edge of the first heat-conducting subplate; and / or, the heat-conducting plate includes a plurality of second heat-conducting grooves located on the side of the second heat-conducting plate facing the second receiving cavity, the second heat-conducting grooves extending radially from the middle of the second heat-conducting plate to the edge of the second heat-conducting plate. The provision of heat-conducting grooves is beneficial to dissipate the heat of the heat-conducting medium from the middle to the edge of the heat-conducting plate, thereby improving the heat dissipation effect.

[0017] According to some embodiments of this application, a heat-conducting groove is provided on the side of the heat-conducting plate facing the receiving cavity. The heat-conducting groove facilitates the flow of the heat-conducting medium within the receiving cavity and facilitates the transfer of heat by the heat-conducting medium.

[0018] According to some embodiments of this application, at least a portion of the heat-conducting grooves extends from the center of the heat-conducting plate to its edge; and / or, multiple heat-conducting grooves are arranged side by side, and the heat-conducting grooves extend through the heat-conducting plate in their extending direction. Arranging multiple heat-conducting grooves side by side simplifies the processing technology of the heat-conducting plate and improves production efficiency. The heat-conducting grooves also allow heat to be transferred along their extending direction to the edge of the heat-conducting plate.

[0019] According to some embodiments of this application, the depth of the heat-conducting groove gradually decreases from the middle to the edge of the heat-conducting plate. The greater depth of the heat-conducting groove in the middle of the heat-conducting plate allows it to hold more heat-conducting medium, facilitating the absorption of heat from the center of the electrode body. The smaller depth of the heat-conducting groove at the edge of the heat-conducting plate enhances the structural strength of the heat-conducting plate, thereby improving the structural rigidity of the battery cell.

[0020] Secondly, this application provides a battery device including a battery cell according to any one of the first aspects above.

[0021] Thirdly, this application provides an electrical device, including the battery device described in the second aspect above. Attached Figure Description

[0022] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0023] Figure 1 This is a schematic diagram of the vehicle structure according to some embodiments of this application;

[0024] Figure 2 Exploded view of the battery device according to some embodiments of this application;

[0025] Figure 3 This is a schematic diagram of the structure of a battery module according to some embodiments of this application;

[0026] Figure 4 This is a schematic diagram of the exploded structure of a battery cell according to some embodiments of this application;

[0027] Figure 5 This is a schematic diagram of the structure of a battery cell according to some embodiments of this application;

[0028] Figure 6 This is a partial structural cross-sectional view of a battery cell according to some embodiments of this application;

[0029] Figure 7 This is a partial structural schematic diagram of a battery cell according to other embodiments of this application;

[0030] Figure 8 This is a partial structural schematic diagram of a battery cell according to some embodiments of this application;

[0031] Figure 9 This is a partial structural schematic diagram of a battery cell according to some embodiments of this application;

[0032] Figure 10 This is a partial structural diagram of a battery cell according to some embodiments of this application.

[0033] Figure label:

[0034] 1000, vehicles;

[0035] 100. Battery assembly; 110. Battery cell; 200. Control system; 300. Motor; 400. Housing; 410. First housing section; 420. Second housing section; 430. Receiving section; 500. Battery module;

[0036] 10. Housing; 11. End cap; 20. Electrode assembly; 21. Electrode body; 21a. First end face; 21b. Second end face; 21c. Side face; 22. Tab;

[0037] 30. Heat-conducting plate; 31. First heat-conducting plate; 31a. First heat-conducting sub-plate; 32. Second heat-conducting plate; 40. Receiving cavity; 41. First receiving cavity; 42. Second receiving cavity; 43. Gap;

[0038] 50. Heat conduction groove; 51. First heat conduction groove; 52. Second heat conduction groove;

[0039] X, first direction; Y, second direction; Z, third direction. Detailed Implementation

[0040] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0042] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0043] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0044] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0045] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0046] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0047] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0048] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely applied in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of battery device applications, market demand is also constantly increasing.

[0049] In related technologies, as a battery cell cycles through charge and discharge, it generates a significant amount of heat. If this heat cannot be effectively and promptly dissipated, it will affect the battery cell's performance and lifespan, and may even lead to the risk of thermal runaway. To address this, traditional batteries incorporate external cooling structures, such as water-cooled pipes or liquid-cooled plates, to reduce the cell's surface temperature. However, this design increases the amount of heat transfer medium between the internal heat source and the cooling structure, reducing heat transfer efficiency and resulting in relatively poor cooling performance.

[0050] Based on the above-mentioned technical problems, this application provides a technical solution in which an independent heat-conducting component is set inside the casing of the battery cell. The heat-conducting component is in direct contact with the electrode assembly and the casing, reducing the amount of heat transfer medium between the two. The heat-conducting component includes a heat-conducting plate, which encloses a cavity and is filled with a heat-conducting medium to improve heat transfer efficiency and cooling effect, reduce the risk of thermal runaway of the battery cell, and improve the reliability of the battery cell.

[0051] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0052] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0053] The battery device mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0054] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells into a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0055] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cell assemblies housed within the housing.

[0056] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0057] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0058] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0059] In some embodiments, the battery device may be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0060] The technical solutions described in this application are applicable to battery devices and electrical devices using battery devices. Electrical devices include, for example, mobile phones, portable devices, laptops, electric vehicles, electric cars, ships, spacecraft, electric toys, and power tools. Spacecraft include, for example, airplanes, rockets, space shuttles, and spacecraft. Electric toys include, for example, stationary or mobile electric toys, specifically, game consoles, electric car toys, electric ship toys, and electric airplane toys. Power tools include, for example, metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, specifically, electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers.

[0061] The battery cells described in this application are not limited to the electrical devices described above, but for the sake of brevity, the following embodiments are all illustrated using electric vehicles as an example.

[0062] Please see Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle provided in an embodiment of this application.

[0063] Vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 can be installed inside vehicle 1000, specifically, for example, at the bottom, front, or rear of vehicle 1000. The battery device 100 can be used to power vehicle 1000; for example, it can serve as the operating power source for vehicle 1000. Vehicle 1000 may also include a control system 200 and a motor 300. The control system 200, for example, controls the battery device to supply power to the motor 300. The battery device can be used for starting and navigating vehicle 1000. Of course, the battery device 100 can also be used to drive vehicle 1000, replacing or partially replacing gasoline or natural gas as the driving force for vehicle 1000.

[0064] Figure 2 This is an exploded structural diagram of a battery device provided in an embodiment of this application. Figure 2 As shown, the battery device 100 includes a housing 400 and battery cells (not shown in the figure), with the battery cells housed within the housing 400.

[0065] The housing 400 is used to house individual battery cells, and the housing 400 can have various structures. In some embodiments, the housing 400 may include a first housing portion 410 and a second housing portion 420, which overlap each other, and together define a receiving portion 430 for housing the individual battery cells. The second housing portion 420 may be a hollow structure with one end open, and the first housing portion 410 may be a plate-like structure, with the first housing portion 410 covering the open side of the second housing portion 420 to form a housing with the receiving portion 430; alternatively, both the first housing portion 410 and the second housing portion 420 may be hollow structures with one side open, with the open side of the first housing portion 410 covering the open side of the second housing portion 420 to form a housing 400 with the receiving portion 430. Of course, the first housing portion 410 and the second housing portion 420 can have various shapes, such as cylinders, cuboids, etc.

[0066] In the battery device 100, there can be multiple battery cells. These multiple battery cells can be connected in series, parallel, or in a hybrid configuration. A hybrid configuration means that multiple battery cells are connected in both series and parallel connections. Multiple battery cells can be directly connected in series, parallel, or in a hybrid configuration, and then the entire assembly of these multiple battery cells is housed within the housing 400. Alternatively, multiple battery cells can first be connected in series, parallel, or in a hybrid configuration to form a battery module 500, and then these battery modules 500 can be connected in series, parallel, or in a hybrid configuration to form a whole, which is then housed within the housing 400.

[0067] Figure 3 This is a schematic diagram of the structure of a battery module provided in an embodiment of this application.

[0068] In some embodiments, such as Figure 3 As shown, there are multiple battery cells 110. These multiple battery cells 110 are first connected in series, parallel, or in a mixed manner to form a battery module 500. The multiple battery modules 500 are then connected in series, parallel, or in a mixed manner to form a whole, which is housed in the casing.

[0069] like Figures 4 to 6 As shown, this application provides a battery cell 110, including: a housing 10, an electrode assembly 20 and a heat-conducting assembly. The electrode assembly 20 is located inside the housing 10. The heat-conducting assembly includes a heat-conducting plate 30 located inside the housing 10. The heat-conducting plate 30 surrounds a receiving cavity 40, which contains a heat-conducting medium. At least a portion of the heat-conducting plate 30 is thermally connected to the electrode assembly 20 and the housing 10.

[0070] For example, electrode assembly 20 is a component in the battery cell 110 where an electrochemical reaction occurs. The housing 10 may contain one or more electrode assemblies 20. Electrode assembly 20 can be a wound structure, a stacked structure, a wound-stacked composite structure, or other structures.

[0071] For example, the electrode assembly 20 includes an electrode body 21 and a tab 22. The electrode body 21 includes a first end face 21a and a second end face 21b and a side face 21c connected between the first end face 21a and the second end face 21b. The heat-conducting plate 30 can be thermally connected to the end face of the electrode assembly 20 or thermally connected to the side face 21c of the electrode assembly 20.

[0072] For example, the heat-conducting plate 30 can form the receiving cavity 40 by enclosing the receiving cavity 40, or the heat-conducting plate 30 and the shell 10 can jointly enclose the receiving cavity 40.

[0073] For example, the heat transfer medium can be a solid, liquid, or gas.

[0074] For example, the heat-conducting plate 30 and the housing 10 can be connected by the heat-conducting plate 30 to the housing 10 to achieve a heat-conducting connection, or the heat-conducting plate 30 can be connected to the housing 10 through a heat-conducting medium to achieve a heat-conducting connection.

[0075] In this embodiment, the heat-conducting plate 30 encloses a receiving cavity 40, which contains a heat-conducting medium. At least a portion of the heat-conducting plate 30 is thermally connected to the electrode assembly 20. The heat generated by the electrode assembly 20 during charging and discharging can be transferred to the heat-conducting medium through the heat-conducting plate 30, reducing the risk of overheating of the electrode assembly 20. Furthermore, the heat-conducting plate 30 is thermally connected to the housing 10, allowing the heat from the heat-conducting medium and the heat-conducting plate 30 to dissipate through the housing 10, thus improving the heat dissipation capacity of the battery cell 110. When the electrode assembly 20 needs to be heated, heat is transferred through the housing 10 to the heat-conducting plate 30 and the heat-conducting medium, and then through the heat-conducting plate 30 to the electrode assembly 20. This can quickly increase the temperature of the electrode assembly 20, improve temperature management efficiency, increase the continuous charge-discharge rate of the battery cell 110, and thus improve the reliability of the battery cell 110.

[0076] Optionally, the heat-conducting plate 30 may include a rigid material, and the heat-conducting plate 30 disposed within the housing 10 can also improve the rigidity of the housing 10.

[0077] Optional, such as Figure 4 As shown, the battery cell 110 also includes an end cap 11, and the housing 10 has an opening, with the end cap 11 used to close the opening. The housing 10 is a component used to mate with the end cap 11 to form an internal cavity of the battery cell 110, which can be used to accommodate the electrode assembly 20, electrolyte, and other components.

[0078] like Figure 4 and Figure 5As shown, in some optional embodiments, the electrode assembly 20 includes an electrode body 21 and a tab 22. The electrode body 21 includes a first end face 21a and a second end face 21b disposed opposite to each other in a first direction X, and a side face 21c connected between the first end face 21a and the second end face 21b. The tab 22 is connected to at least one of the first end face 21a and the second end face 21b. A heat-conducting plate 30 is disposed on at least a portion of the side face 21c and is thermally connected to the side face 21c.

[0079] For example, the electrode 22 is connected to the first end face 21a or the second end face 21b, or the electrode 22 is connected to both the first end face 21a and the second end face 21b.

[0080] For example, the heat-conducting plate 30 may be partially in contact with the side 21c, or the heat-conducting plate 30 may be in contact with the entire side 21c to improve the heat conduction effect.

[0081] In these optional embodiments, the first end face 21a and / or the second end face 21b of the electrode body 21 are used to provide the tabs 22. The side surface 21c of the electrode body 21 connected to the first end face 21a and the second end face 21b generates a lot of heat during charging and discharging. Therefore, the heat-conducting plate 30 is disposed on at least a portion of the side surface 21c and is thermally connected to the side surface 21c, which facilitates heat transfer between the heat-conducting plate 30 and the electrode body 21. The heat-conducting plate 30 disposed on at least a portion of the side surface 21c can resist the expansion force of the electrode assembly 20 during charging and discharging, improving the reliability of the battery cell 110.

[0082] like Figure 4 and Figure 5 As shown, in some optional embodiments, the height of the heat-conducting plate 30 along the first direction X is less than the height of the electrode body 21 along the first direction X.

[0083] In these alternative embodiments, the height of the heat-conducting plate 30 along the first direction X is less than the height of the electrode body 21 along the first direction X, leaving more space for the connection of the tab 22.

[0084] Optional, such as Figure 4 As shown, the side surface 21c of the electrode body 21 extends along the first direction X, and the height of the heat-conducting plate 30 along the first direction X is less than the height of the side surface 21c of the electrode body 21 along the first direction X.

[0085] In some alternative embodiments, the height of the heat-conducting plate 30 along the first direction X is equal to the height of the electrode body 21 along the first direction X.

[0086] In these alternative embodiments, the height of the heat-conducting plate 30 along the first direction X is equal to the height of the electrode body 21 along the first direction X, which can increase the contact area between the heat-conducting plate 30 and the electrode body 21 and improve the heat transfer efficiency.

[0087] Optionally, the side surface 21c of the electrode body 21 extends along the first direction X, and the height of the heat-conducting plate 30 along the first direction X is equal to the height of the side surface 21c of the electrode body 21 along the first direction X.

[0088] like Figure 5 and Figure 6 As shown, in some optional embodiments, at least a portion of the heat-conducting plate 30 is located between the electrode assembly 20 and the housing 10, and together with the housing 10, forms a receiving cavity 40.

[0089] For example, the number of heat-conducting plates 30 can be one or more, and at least some of the heat-conducting plates 30 are located between the electrode assembly 20 and the housing 10. This can be a partial location of one or more heat-conducting plates 30 between the electrode assembly 20 and the housing 10, or all of one or more heat-conducting plates 30 are located between the electrode assembly 20 and the housing 10, thereby increasing the heat-conducting area between the heat-conducting plates 30 and the electrode assembly 20 and the housing 10.

[0090] In these optional embodiments, the heat-conducting plate 30 and the housing 10 together form a receiving cavity 40, and a heat-conducting medium is disposed within the receiving cavity 40. This facilitates the dissipation of heat from the heat-conducting medium from the housing 10 to the outside of the battery cell 110, and also allows for effective heat transfer from the housing 10 to the heat-conducting medium when the battery cell 110 is heated. At least a portion of the heat-conducting plate 30 is located between the electrode assembly 20 and the housing 10, facilitating mutual heat conduction between the heat-conducting medium and the electrode assembly 20 through the heat-conducting plate 30, thereby improving heat transfer efficiency.

[0091] like Figure 5 and Figure 6 As shown, in some optional embodiments, the heat-conducting plate 30 includes a first heat-conducting plate 31, which is disposed between the electrode assembly 20 and the housing 10, and the receiving cavity 40 includes a first receiving cavity 41 formed by the first heat-conducting plate 31 and the housing 10.

[0092] For example, the number of first heat-conducting plates 31 can be one, or there can be multiple first heat-conducting plates 31. The multiple first heat-conducting plates 31 are respectively located on the periphery of the electrode assembly 20 and between the electrode assembly 20 and the housing 10. The multiple first heat-conducting plates 31 enclose one or more first receiving cavities 41.

[0093] In these optional embodiments, the first heat-conducting plate 31 is disposed between the electrode assembly 20 and the housing 10, which helps to increase the heat transfer area between the first heat-conducting plate 31 and the electrode assembly 20 and the housing 10, thereby improving the heat transfer efficiency. The first receiving cavity 41 is formed by the first heat-conducting plate 31 and the housing 10, and a heat-conducting medium is disposed in the first receiving cavity 41, which facilitates the transfer of heat between the first heat-conducting plate 31 and the housing 10.

[0094] like Figure 5 and Figure 6 As shown, in some optional embodiments, the battery cell 110 includes at least two electrode assemblies 20 arranged side by side along the second direction Y, the heat-conducting plate 30 also includes a second heat-conducting plate 32, the second heat-conducting plate 32 is located between two adjacent electrode assemblies 20, and the receiving cavity 40 includes a second receiving cavity 42 formed by the second heat-conducting plate 32.

[0095] In these optional embodiments, the electrode assemblies 20 are arranged adjacent to each other along the second direction Y. The heat generated by the two electrode assemblies 20 is superimposed between them. Placing the second heat-conducting plate 32 between two adjacent electrode assemblies 20 helps to improve the heat dissipation effect of the electrode assemblies 20 and reduce the probability of overheating. The second heat-conducting plate 32 encloses a second receiving cavity 42, and a second heat-conducting medium is disposed within the second receiving cavity 42, which helps to improve the absorption effect of the second heat-conducting medium on the heat generated by the electrode assemblies 20.

[0096] like Figure 6 As shown, in some optional embodiments, the first receiving cavity 41 is connected to the second receiving cavity 42.

[0097] In these optional embodiments, the first receiving cavity 41 is connected to the second receiving cavity 42, which can improve the heat transfer efficiency of the heat-conducting medium in the first receiving cavity 41 and the second receiving cavity 42. Furthermore, the heat-conducting medium can flow between the first receiving cavity 41 and the second receiving cavity 42, improving the heat transfer effect and enhancing the heat uniformity of the battery cell 110.

[0098] like Figure 6 As shown, in some optional embodiments, the first heat-conducting plate 31 includes a plurality of first heat-conducting sub-plates 31a located on at least one side of the electrode assembly 20 in the third direction Z. Each first heat-conducting sub-plate 31a is connected to the end of the second heat-conducting plate 32 in the third direction Z, and the first direction X, the second direction Y and the third direction Z intersect each other.

[0099] For example, the first heat-conducting subplate 31a may be disposed on the third Z-side of the electrode assembly 20, or the third heat-conducting subplate may be disposed on both sides of the third Z-side of the electrode assembly 20.

[0100] For example, the first direction X, the second direction Y, and the third direction Z can intersect each other in a way that the first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0101] In these optional embodiments, the first heat-conducting subplate 31a is connected to the third-direction Z end of the second heat-conducting plate 32, which can improve the heat conduction efficiency between the first heat-conducting subplate 31a and the second heat-conducting plate 32, and also improve the structural strength of the first heat-conducting subplate 31a and the second heat-conducting plate 32, thereby improving the structural rigidity of the battery cell 110.

[0102] like Figure 6 As shown, in some optional embodiments, two second heat-conducting plates 32 are spaced apart along the second direction Y to enclose and form a second receiving cavity 42 and a gap 43 communicating with the first receiving cavity 41. Each second heat-conducting plate 32 is connected to each first heat-conducting sub-plate 31a so that the first receiving cavity 41 and the second receiving cavity 42 are interconnected through the gap 43.

[0103] In these optional embodiments, two second heat-conducting plates 32 are spaced apart along the second direction Y to form a second receiving cavity 42, and a gap 43 is formed between the two ends of the two second heat-conducting plates 32 along the third direction Z. The second receiving cavity 42 is connected to the first receiving cavity 41 through the gap 43. Each second heat-conducting plate 32 is connected to each first heat-conducting sub-plate 31a. The first heat-conducting sub-plate 31a is located on the side of the second heat-conducting plate 32 away from the first receiving cavity 41, reducing the degree of obstruction of the gap 43 by the first heat-conducting sub-plate 31a, so that the heat-conducting medium can flow between the first receiving cavity 41 and the second receiving cavity 42 through the gap 43.

[0104] like Figure 7 As shown, in some optional embodiments, the heat-conducting plate 30 includes a plurality of first heat-conducting grooves 51 located on the side of the first heat-conducting subplate 31a facing the first receiving cavity 41, the plurality of first heat-conducting grooves 51 extending radially from the middle of the side of the first heat-conducting subplate 31a near the gap 43 to the edge of the first heat-conducting subplate 31a.

[0105] In these optional embodiments, a plurality of first heat-conducting grooves 51 are provided on the side of the first heat-conducting subplate 31a facing the first receiving cavity 41, which is beneficial to the flow of the heat-conducting medium. The middle part of the electrode body 21 is farthest from the shell 10, which makes the heat dissipation in the middle part of the electrode body 21 slower. Heat will be superimposed between two adjacent electrode bodies 21, that is, the heat of the heat-conducting medium in the middle of the second receiving cavity 42 is higher. The heat of the heat-conducting medium in the middle of the second receiving cavity 42 is transferred to the gap 43. The plurality of first heat-conducting grooves 51 extend radially from the middle part of the first heat-conducting subplate 31a near the gap 43 to the edge of the first heat-conducting subplate 31a, which is beneficial to dissipate the heat of the heat-conducting medium from the middle of the gap 43 to the edge of the first heat-conducting subplate 31a.

[0106] like Figure 8As shown, in some optional embodiments, the heat-conducting plate 30 includes a plurality of second heat-conducting grooves 52 located on the side of the second heat-conducting plate 32 facing the second receiving cavity 42, the second heat-conducting grooves 52 extending radially from the middle of the second heat-conducting plate 32 to the edge of the second heat-conducting plate 32.

[0107] In these optional embodiments, heat will be superimposed between two adjacent electrode bodies 21, resulting in higher heat in the middle of the second receiving cavity 42. The heat-conducting plate 30 includes a plurality of second heat-conducting grooves 52 located on the side of the second heat-conducting plate 32 facing the second receiving cavity 42. The second heat-conducting grooves 52 facilitate the flow of the heat-conducting medium. The second heat-conducting grooves 52 extend radially from the middle of the second heat-conducting plate 32 to the edge of the second heat-conducting plate 32, thereby facilitating the dissipation of heat from the middle of the second heat-conducting plate 32 to the edge of the second heat-conducting subplate.

[0108] like Figure 7 and Figure 8 As shown, in some optional embodiments, the heat-conducting plate 30 is provided with a heat-conducting groove 50 on the side facing the receiving cavity 40.

[0109] In these alternative embodiments, the heat-conducting groove 50 facilitates the flow of the heat-conducting medium within the receiving cavity 40, thereby facilitating the transfer of heat from the heat-conducting medium.

[0110] like Figure 7 and Figure 8 As shown, in some optional embodiments, at least a portion of the heat-conducting groove 50 extends from the middle of the heat-conducting plate 30 to the edge of the heat-conducting plate 30.

[0111] In these alternative embodiments, the middle part of the electrode body 21 is furthest from the housing 10, which makes the heat dissipation in the middle part of the electrode body 21 slower, resulting in higher heat in the heat-conducting medium located in the middle of the heat-conducting plate 30. The heat-conducting groove 50 extends from the middle of the heat-conducting plate 30 to the edge of the heat-conducting plate 30, thereby transferring the heat of the heat-conducting medium in the middle of the heat-conducting plate to the heat-conducting medium at the edge of the heat-conducting plate 30 through the heat-conducting path of the heat-conducting medium, thereby improving the heat dissipation efficiency of the battery cell 110.

[0112] like Figure 9 and Figure 10 As shown, in some alternative embodiments, a plurality of heat-conducting grooves 50 are arranged side by side, and the heat-conducting grooves 50 are disposed through the heat-conducting plate 30 in their extending direction.

[0113] For example, the heat conduction groove 50 may extend perpendicular to the thickness direction of the heat conduction plate 30.

[0114] For example, the heat-conducting groove 50 located on the first heat-conducting plate 31 extends along the first direction X or the second direction Y.

[0115] For example, such as Figure 9 and Figure 10As shown, the heat-conducting groove 50 located on the second heat-conducting plate 32 extends along the first direction X or the third direction Z.

[0116] In these alternative embodiments, arranging multiple heat-conducting grooves 50 side by side simplifies the processing of the heat-conducting plate 30 and improves production efficiency. Furthermore, the heat-conducting grooves 50 also allow heat to be transferred along their extension direction to the edge of the heat-conducting plate 30.

[0117] like Figures 7 to 10 As shown, in some optional embodiments, the depth of the heat-conducting groove 50 gradually decreases in the direction from the middle of the heat-conducting plate 30 to the edge of the heat-conducting plate 30.

[0118] In these optional embodiments, the depth of the heat-conducting groove 50 gradually decreases from the middle to the edge of the heat-conducting plate 30. The heat-conducting groove 50 located in the middle of the heat-conducting plate 30 has a greater depth, which can accommodate more heat-conducting medium and facilitate the absorption of heat from the middle of the electrode body 21. The heat-conducting groove 50 located at the edge of the heat-conducting plate 30 has a smaller depth, which can improve the structural strength of the heat-conducting plate 30, thereby improving the structural rigidity of the battery cell 110.

[0119] Optionally, the width of the heat conduction groove 50 gradually increases from the middle of the heat conduction plate 30 to the edge of the heat conduction plate 30, which helps to increase the arrangement area of ​​the heat conduction groove 50 and improve the fluidity of the heat conduction medium.

[0120] In some embodiments, the battery cell 110 includes a housing 10, an electrode assembly 20, and a heat-conducting assembly. The electrode assembly 20 is located inside the housing 10 and includes an electrode body 21 and a tab 22. The electrode body 21 includes a first end face 21a and a second end face 21b disposed opposite to each other in a first direction X, and a side surface 21c connected between the first end face 21a and the second end face 21b. The tab 22 is connected to at least one of the first end face 21a and the second end face 21b. The heat-conducting assembly includes a first heat-conducting sub-plate 31a and a second heat-conducting plate 32 located inside the housing 10. The first heat-conducting sub-plate 31a and the second heat-conducting plate 32 are thermally connected to the side surface 21c of the electrode body 21. At least two electrode assemblies 20 are provided inside the housing 10. The at least two electrode assemblies 20 are arranged side by side along the second direction Y. The first heat-conducting sub-plate 31a is located on both sides of the electrode assembly 20 in the third direction Z. The first heat-conducting sub-plate 31a and the housing 10 together form a first receiving cavity 41. Two second heat-conducting plates 32 are arranged at intervals along the second direction Y to form a second receiving cavity 42 and a gap 43 communicating with the first receiving cavity 41. Each first heat-conducting sub-plate 31a is connected to the end of the second heat-conducting plate 32 in the third direction Z, so that the first receiving cavity 41 and the second receiving cavity 42 are interconnected through the gap 43. A plurality of first heat-conducting grooves 51 are provided on the side of the first heat-conducting subplate 31a facing the first receiving cavity 41. The plurality of first heat-conducting grooves 51 extend radially from the middle of the side of the first heat-conducting subplate 31a near the gap 43 to the edge of the first heat-conducting subplate 31a. A plurality of second heat-conducting grooves 52 are provided on the side of the second heat-conducting plate 32 facing the second receiving cavity 42. The second heat-conducting grooves 52 extend radially from the middle of the second heat-conducting plate 32 to the edge of the second heat-conducting plate 32. In the direction from the middle of the heat-conducting plate 30 to the edge of the heat-conducting plate 30, the depth of the first heat-conducting grooves 51 and the second heat-conducting grooves 52 gradually decreases.

[0121] Secondly, this application provides a battery device 100, including the battery cell 110 in any of the embodiments of the first aspect described above.

[0122] The battery device 100 provided in the embodiments of this application has all the beneficial effects of the battery cell 110 in any of the embodiments of the first aspect due to the use of the battery cell 110 provided in the first aspect. For details, please refer to the specific description of the battery cell 110 in the above embodiments. This embodiment will not repeat the description here.

[0123] Thirdly, this application also provides an electrical device, including a battery cell 110 or a battery device 100 in any of the embodiments of the first and second aspects described above, wherein the battery cell 110 or the battery device 100 is used to store or provide electrical energy.

[0124] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, include: case; The electrode assembly is located within the housing; A heat-conducting component includes a heat-conducting plate located within the housing, the heat-conducting plate forming a receiving cavity, the receiving cavity containing a heat-conducting medium, and at least a portion of the heat-conducting plate being thermally connected to the electrode assembly and the housing.

2. The battery cell according to claim 1, characterized in that, The electrode assembly includes an electrode body and a tab. The electrode body includes a first end face and a second end face disposed opposite to each other in a first direction, and a side face connected between the first end face and the second end face. The tab is connected to at least one of the first end face and the second end face. The heat-conducting plate is disposed on at least a portion of the side surface and is thermally connected to the side surface.

3. The battery cell according to claim 2, characterized in that, The height of the heat-conducting plate along the first direction is less than or equal to the height of the electrode body along the first direction.

4. The battery cell according to claim 1, characterized in that, At least a portion of the heat-conducting plate is located between the electrode assembly and the housing, and together with the housing, they enclose the receiving cavity.

5. The battery cell according to claim 4, characterized in that, The heat-conducting plate includes a first heat-conducting plate, which is disposed between the electrode assembly and the housing. The receiving cavity includes a first receiving cavity formed by the first heat-conducting plate and the housing together.

6. The battery cell according to claim 5, characterized in that, The battery cell includes at least two electrode assemblies arranged side by side along a second direction, the heat-conducting plate also includes a second heat-conducting plate located between two adjacent electrode assemblies, and the receiving cavity includes a second receiving cavity formed by the second heat-conducting plate.

7. The battery cell according to claim 6, characterized in that, The first receiving cavity is connected to the second receiving cavity.

8. The battery cell according to claim 6, characterized in that, The first heat-conducting plate includes a plurality of first heat-conducting sub-plates located on at least one side of the electrode assembly in a third direction, each of the first heat-conducting sub-plates being connected to the end of the second heat-conducting plate in the third direction, the second direction intersecting the third direction.

9. The battery cell according to claim 8, characterized in that, Two second heat-conducting plates are spaced apart along the second direction to enclose and form the second receiving cavity and a gap communicating with the first receiving cavity. Each second heat-conducting plate is connected to each first heat-conducting sub-plate so that the first receiving cavity and the second receiving cavity are interconnected through the gap.

10. The battery cell according to claim 9, characterized in that, The heat-conducting plate includes a plurality of first heat-conducting grooves located on the side of the first heat-conducting subplate facing the first receiving cavity. The plurality of first heat-conducting grooves extend radially from the middle of the side of the first heat-conducting subplate near the gap to the edge of the first heat-conducting subplate. And / or, the heat-conducting plate includes a plurality of second heat-conducting grooves located on the side of the second heat-conducting plate facing the second receiving cavity, the second heat-conducting grooves extending radially from the middle of the second heat-conducting plate to the edge of the second heat-conducting plate.

11. The battery cell according to any one of claims 1-9, characterized in that, The heat-conducting plate has a heat-conducting groove on the side facing the receiving cavity.

12. The battery cell according to claim 11, characterized in that, At least a portion of the heat-conducting groove extends from the middle of the heat-conducting plate to the edge of the heat-conducting plate; And / or, a plurality of the heat-conducting grooves are arranged side by side, and the heat-conducting grooves extend through the heat-conducting plate in their extending direction.

13. The battery cell according to claim 12, characterized in that, The depth of the heat-conducting groove gradually decreases from the middle of the heat-conducting plate to its edge.

14. A battery device, characterized in that, Includes the battery cell described in any one of claims 1-13.

15. An electrical appliance, characterized in that, Includes the battery device as described in claim 14.

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