Battery monomer, battery device and electric device

Abstract

The utility model provides a battery monomer, a battery device and a power utilization device. The battery monomer comprises a shell, an electrode assembly, a first electrode terminal and a first adapter. The housing includes a first wall portion. The electrode assembly is accommodated within the housing and includes a first tab. The first electrode terminal is provided on the first wall portion. The first adapter is connected with the first electrode terminal and the first tab, the first adapter is connected with the first tab to form a first connecting area, the first connecting area is not overlapped with the first electrode terminal in the thickness direction of the first wall part, and the first connecting area is configured to be overlapped with the heat conduction part located on the outer side of the first wall part in the thickness direction of the first wall part. The cycle performance of the battery monomer can be improved.

Description

Technical Field

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

[0002] Battery cells are widely used in electronic devices such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools. Battery cells can include nickel-cadmium battery cells, nickel-metal hydride battery cells, lithium-ion battery cells, and rechargeable alkaline zinc-manganese battery cells, among others.

[0003] In the development of battery technology, how to improve the cycle performance of individual battery cells has always been a research direction in battery technology. Utility Model Content

[0004] In view of the above problems, this application provides a battery cell, a battery device, and an electrical device that can improve the cycle performance of the battery cell.

[0005] In a first aspect, this application provides a battery cell. The battery cell includes a housing, an electrode assembly, a first electrode terminal, and a first adapter. The housing includes a first wall. The electrode assembly is housed within the housing and includes a first tab. The first electrode terminal is disposed on the first wall. The first adapter connects the first electrode terminal and the first tab, and the first adapter is connected to the first tab to form a first connection area. In the thickness direction of the first wall, the first connection area does not overlap with the first electrode terminal, and the first connection area is configured to overlap with a heat-conducting element located outside the first wall in the thickness direction of the first wall.

[0006] In the above scheme, during battery cycling, current flows through the first tab, the first adapter, and the first electrode terminal, causing heat generation in the first connection area. The first connection area can overlap with the heat-conducting component in the thickness direction, thereby shortening the heat conduction path between the first connection area and the heat-conducting component, improving the heat dissipation capacity of the battery cell, reducing the risk of thermal runaway during use and charging, reducing the temperature rise of the battery cell, and improving the cycle performance and cycle life of the battery cell. In the thickness direction, the first connection area and the first electrode terminal do not overlap, allowing the first connection area and the heat-conducting component to overlap in the thickness direction while reducing the possibility of interference between the heat-conducting component and the first electrode terminal. This facilitates increasing the arrangement space of the heat-conducting component on the outer side of the first wall, helping to increase the size of the heat-conducting component, thereby increasing its thermal conductivity and improving the heat dissipation efficiency of the battery cell.

[0007] In some embodiments, the housing further includes two second walls disposed opposite to each other along the length direction of the first wall, the two second walls being located on both sides of the first wall along the length direction of the first wall. The first electrode terminal includes a first terminal portion located outside the first wall, the distance between the first terminal portion and the second wall portion is d, the dimension of the first wall portion along its own length direction is D, and d and D satisfy the relationship 0.25≤d / D≤0.45.

[0008] In the above scheme, the ratio of the dimension between the first terminal portion and the second wall portion to the length dimension of the first wall portion is greater than or equal to 0.25. This allows for a larger area to be reserved in the first terminal portion for arranging heat-conducting components, thereby increasing the contact area between the heat-conducting components and the battery cell, improving the heat dissipation efficiency of the battery cell, and enhancing the cycle performance and reliability of the battery cell. Conversely, a ratio of the dimension between the first terminal portion and the second wall portion to the length dimension of the first wall portion is less than or equal to 0.45, allowing for the provision of installation space for other components of the battery cell.

[0009] In some embodiments, the battery cell further includes a thermally conductive structure, through which the first connection region and the first wall portion are connected.

[0010] In the above scheme, by setting a heat-conducting structure, the heat generated in the first connection area is conducted to the first wall through the heat-conducting structure, and then to the heat-conducting component through the first wall, so as to shorten the heat conduction path between the first connection area and the heat-conducting component and improve the heat dissipation efficiency of the battery cell.

[0011] In some embodiments, the battery cell further includes an insulating element located on the side of the first wall facing the electrode assembly, with at least a portion of the insulating element located between the thermally conductive structure and the first wall.

[0012] In the above scheme, an insulating component is provided between the heat-conducting structure and the first wall portion to further improve the insulation performance between the adapter and the first wall portion, reduce the possibility of short circuit between the electrode tab and the first wall portion, and improve the reliability of the battery cell.

[0013] In some embodiments, the first wall portion is provided with a first electrode lead-out hole, and the first electrode terminal includes a first terminal portion and a second terminal portion. At least a portion of the second terminal portion is accommodated in the first electrode lead-out hole, and the first terminal portion is connected to the first adapter through the second terminal portion. The second terminal portion and the first adapter are integrally formed, which can improve the connection strength between the second terminal portion and the first adapter, reduce resistance, and improve the overcurrent capacity.

[0014] In some embodiments, the first adapter further includes a second connecting area and a first bending area connecting the first connecting area and the second connecting area. The first connecting area, the first bending area, and the second connecting area are arranged sequentially along the length direction of the first wall portion, and both the first connecting area and the second connecting area are bent relative to the first bending area. The second connecting area and the second terminal portion are integral structures.

[0015] The above solution helps to reduce the space occupied by the first adapter in the thickness direction and improve the energy density of the battery cell.

[0016] In some embodiments, at least a portion of the first bending region overlaps with the first terminal portion in the thickness direction of the first wall portion to increase the size of the first connection region, thereby increasing the connection area between the first tab and the first adapter and increasing the overall current carrying capacity of the battery cell.

[0017] In some embodiments, the battery cell further includes a second electrode terminal and a second adapter. The second electrode terminal is disposed on the first wall portion. The electrode assembly also includes a second tab with a polarity opposite to that of the first tab. The second adapter connects the second electrode terminal and the second tab, and the second adapter is connected to the second tab to form a third connection area. In the thickness direction of the first wall portion, the third connection area does not overlap with the second electrode terminal, and the third connection area is configured to overlap with a heat-conducting element located outside the first wall portion in the thickness direction of the first wall portion.

[0018] In the above scheme, during battery cycling, current flows through the second tab, the second adapter, and the second electrode terminal, causing heat generation in the third connection area. This third connection area overlaps with the heat-conducting component in the thickness direction, thereby shortening the heat conduction path between them, improving the heat dissipation capacity of the battery cell, reducing the risk of thermal runaway during use and charging, decreasing the temperature rise of the battery cell, and improving its cycle performance and cycle life. In the thickness direction, the third connection area does not overlap with the second electrode terminal. This allows the third connection area and the heat-conducting component to overlap in the thickness direction while reducing the possibility of interference between the heat-conducting component and the second electrode terminal. This increases the arrangement space for the heat-conducting component on the outer side of the first wall, helping to increase its size and thus its thermal conductivity, thereby improving the heat dissipation efficiency of the battery cell.

[0019] In some embodiments, in the thickness direction of the first wall portion, the first connection area is located on the side of the first electrode terminal facing away from the second electrode terminal; and / or, in the thickness direction of the first wall portion, the third connection area is located on the side of the second electrode terminal facing away from the first electrode terminal.

[0020] In the above-described scheme, during the use of the battery cell, the deformation of the central area of ​​the large surface of the battery cell is greater than that of the edge area. This embodiment of the application, through the above-described arrangement, positions the electrode terminals closer to the central area of ​​the large surface of the battery cell and the tabs closer to the edge area. This helps reduce the pulling force on the tabs due to expansion, reducing the possibility of solder cracking caused by pulling on the tabs and adapters, and improving the reliability of the battery cell. Simultaneously, the electrode terminals can also enhance the strength of the central area of ​​the first wall of the battery cell, thereby improving the overall strength of the battery cell.

[0021] In some embodiments, the dimension of the battery cell in the thickness direction of the first wall portion is 150 mm to 350 mm.

[0022] In the above scheme, by setting the dimension of the battery cell in the thickness direction of the first wall portion to be greater than or equal to 150 mm, the total capacity of the battery cell is increased, thereby improving the battery cell's range. By setting the dimension of the battery cell in the thickness direction of the first wall portion to be less than or equal to 350 mm, the heat transfer path inside the battery cell is shortened, reducing the possibility of uneven temperature distribution inside the battery cell.

[0023] In some embodiments, the housing includes a shell and an end cap, the shell having an opening, and the end cap being connected to the shell and covering the opening. The end cap is a first wall portion.

[0024] In the above scheme, the end cap usually has a larger thickness than the shell; placing the first electrode terminal on the end cap can improve the connection strength between the first electrode terminal and the end cap, enhance the stability of the first electrode terminal, and reduce the risk of the first electrode terminal shifting.

[0025] Secondly, embodiments of this application provide a battery device, including a battery cell as described in any of the foregoing embodiments and a heat-conducting element. At least a portion of the heat-conducting element is located on the side of the first wall facing away from the electrode assembly and conducts heat to the first connection area.

[0026] Thirdly, embodiments of this application provide an electrical device, including the battery device in any of the foregoing embodiments, the battery device being used to provide electrical energy.

[0027] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the structure of a vehicle provided in an embodiment of this application;

[0030] Figure 2 This is an exploded structural diagram of a battery device provided in an embodiment of this application;

[0031] Figure 3 This is a schematic diagram of the structure of a battery module provided in an embodiment of this application;

[0032] Figure 4 This is a schematic diagram of the exploded structure of a single battery cell provided in an embodiment of this application;

[0033] Figure 5 This is a cross-sectional structural diagram of a battery device provided in an embodiment of this application;

[0034] Figure 6 yes Figure 5 A schematic diagram of an enlarged structure of P;

[0035] Figure 7 yes Figure 5 Another enlarged structural diagram of P.

[0036] Marker description

[0037] 1000, vehicles;

[0038] 100, Battery assembly; 200, Controller; 300, Motor; 400, Housing; 410, First housing section; 420, Second housing section; 430, Receiving section; 500, Battery module;

[0039] 110. Battery cell; 120. Thermal conductive component; 130. Busbar component;

[0040] 10. Outer shell; 11. Housing; 11a. Second wall portion; 12. End cap; 12a. First wall portion;

[0041] 20. Electrode assembly; 21. First electrode tab; 22. Second electrode tab;

[0042] 30. First electrode terminal; 31. First terminal portion; 31a. First edge; 31b. Second edge; 32. Second terminal portion;

[0043] 40. Second electrode terminal;

[0044] 50. First adapter; 51. First connecting area; 52. Second connecting area; 53. First bending area;

[0045] 60. Second adapter; 61. Third connecting area; 62. Fourth connecting area; 63. Second bending area;

[0046] 70. Thermally conductive structure; 80. Insulating component; H. First electrode lead-out hole; X. Length direction; Y. Thickness direction. Detailed Implementation

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple groups" refers to two or more (including two groups), and "multiple pieces" refers to two or more (including two pieces).

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, with the separator positioned between the positive and negative electrodes. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0058] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0059] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0060] In some implementations, the electrode assembly is a stacked structure.

[0061] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0062] As an example, multiple positive electrode plates can be provided, and negative electrode plates can be folded to form multiple stacked folded segments, with a positive electrode plate sandwiched between adjacent folded segments.

[0063] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0064] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0065] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0066] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0067] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0068] In some embodiments, the battery cell may include a casing. The casing may be a steel casing, an aluminum casing, a plastic casing (such as a polypropylene casing), a composite metal casing (such as a copper-aluminum composite casing), or an aluminum-plastic film, etc. In some embodiments, the casing may be a sealed structure or a non-sealed structure. As an example, when the casing is a non-sealed structure, the casing serves to protect the electrode assembly, and a sealing bag is included between the casing and the electrode assembly to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag may be a bag-shaped insulating component or an aluminum-plastic film. When the casing is a sealed structure, it is used to encapsulate components such as the electrode assembly and electrolyte.

[0069] In some embodiments, the housing includes an end cap and a housing, the housing having an opening, and the end cap covering the opening. The housing may have one or more openings. The end cap may also have one or more.

[0070] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab. The electrode terminal can be indirectly connected to the tab via a current collector. The electrode terminal can be located on the end cap or on the housing.

[0071] The battery apparatus 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 connected in series, parallel, or mixed connections via a busbar.

[0072] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0073] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0074] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0075] 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.

[0076] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0077] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0078] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0079] 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.

[0080] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use individual battery cells, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0081] Currently, judging from market trends, battery applications are becoming increasingly widespread. Batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in aerospace and other fields. With the continuous expansion of battery applications, market demand is also constantly increasing.

[0082] A battery typically refers to a single physical module comprising multiple individual cells to provide higher voltage and capacity. A single cell can be the smallest unit that makes up a battery.

[0083] During battery use and charging, the heat generated by individual battery cells increases, causing them to remain in a high-temperature range. This affects the battery's cycle performance and cycle life. To reduce the battery temperature during use and charging, a water-cooling plate is usually installed at the bottom of the battery for heat dissipation. However, as the battery range increases, the battery size also increases, resulting in poor heat dissipation effect of the bottom water-cooling plate, affecting the battery's cycle performance and cycle life, increasing the risk of battery thermal runaway, and reducing battery reliability.

[0084] Based on the above-mentioned technical problems, this application provides a technical solution that shortens the heat conduction path between the heat conduction component and the first connection area by overlapping the heat conduction component and the first connection area in the thickness direction, thereby improving the heat dissipation capacity of the battery cell, reducing the risk of thermal runaway during use and charging, reducing the temperature rise of the battery cell, and improving the cycle performance and cycle life of the battery cell.

[0085] The technical solutions described in this application are applicable to batteries and electrical devices that use batteries. 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, such as 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, such as, electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers.

[0086] 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.

[0087] Please see Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle provided in an embodiment of this application.

[0088] 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 controller 200 and a motor 300. The controller 200, for example, controls the battery's power supply to the motor 300. The battery can be used for starting and navigation of 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.

[0089] Figure 2 This is a schematic diagram of the exploded structure of a battery provided in an embodiment of this application. For example... 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.

[0090] 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.

[0091] In the battery device 100, there can be one or more battery cells. If there are multiple battery cells, they can be connected in series, in parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells are connected in both series and parallel configurations. Multiple battery cells can be directly connected in series, in parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells is housed within the housing 400. Alternatively, multiple battery cells can first be connected in series, in parallel, or in a mixed configuration to form a battery module 500, and then the multiple battery modules 500 can be connected in series, in parallel, or in a mixed configuration to form a whole, which is then housed within the housing 400.

[0092] Figure 3 This is a schematic diagram of the structure of a battery module provided in an embodiment of this application. Figure 4 This is a schematic diagram of the exploded structure of a single battery cell provided in an embodiment of this application. Figure 5 This is a cross-sectional structural diagram of a battery device provided in an embodiment of this application. Figure 6 yes Figure 5 A schematic diagram of an enlarged structure of P. Figure 7 yes Figure 5 Another enlarged structural diagram of P.

[0093] In some embodiments, such as Figure 3 As shown, the battery includes multiple battery cells 110 and multiple busbars 130, which electrically connect the multiple battery cells 110.

[0094] Multiple busbar components 130 connect multiple battery cells 110 in series, parallel, or mixed connections.

[0095] Multiple busbar components 130 may adopt the same structure or different structures.

[0096] The busbar component 130 can be a single-layer structure or a multi-layer structure.

[0097] In some embodiments, the battery cell 110 includes a first electrode terminal 30 and a second electrode terminal 40 with opposite polarities. As an example, a busbar 130 is connected to the first electrode terminal 30 of one battery cell 110 and the second electrode terminal 40 of another battery cell 110 to connect the two battery cells 110 in series. Alternatively, the busbar 130 is connected to the first electrode terminals 30 of both battery cells 110 to connect the two battery cells 110 in parallel.

[0098] In some embodiments, the bus component 130 is soldered to the first electrode terminal 30.

[0099] In some embodiments, the busbar component 130 has a multi-layer structure. Exemplarily, the busbar component 130 has a multi-layer structure in its thickness direction Y, for example, the busbar component 130 is formed into a two-layer structure or a three-layer structure by bending.

[0100] Each layer of the busbar component 130 can transmit current. By setting the busbar component 130 as a multi-layer structure, the current-carrying area of ​​the busbar component 130 can be increased, the heat generated when the busbar component 130 is overcurrent can be reduced, the temperature rise of the battery cell 110 can be reduced, and the fast charging capability of the battery cell 110 can be improved.

[0101] Provided the current-carrying area meets the requirements, configuring the busbar component 130 as a multi-layer structure can reduce the thickness of each layer. During cycling, the battery cell 110 expands, stretching the layer of the busbar component 130 connected to the battery cell 110. A single layer of the busbar component 130 with a small thickness is easily deformable to accommodate the expansion and deformation of the battery cell 110, thereby reducing the risk of tearing at the connection between the battery cell 110 and the busbar component 130 and improving battery reliability.

[0102] In some embodiments, the battery further includes a heat exchange plate for exchanging heat with the housing 10 of the battery cell 110.

[0103] The heat exchange plate can exchange heat with the battery cell 110 during the cycle, thereby keeping the battery cell 110 within a suitable temperature range, improving the cycle performance and cycle life of the battery cell 110, and reducing the risk of thermal runaway.

[0104] In some embodiments, the housing 10 has two large surfaces disposed opposite each other in the thickness direction Y of the battery cell 110. Along the thickness direction Y of the battery cell 110, a heat exchange plate is disposed on at least one side of the battery cell 110 and exchanges heat with the large surface of the battery cell 110.

[0105] The large surface is the largest surface on the outer surface of the casing 10. By exchanging heat with the heat exchange plate, the heat exchange efficiency is improved, thereby reducing the temperature rise of the battery cell 110 during fast charging, improving the cycle performance and cycle life of the battery cell 110, reducing the risk of thermal runaway, and improving reliability.

[0106] In some embodiments, heat exchange plates are provided on both sides of the battery cell 110, that is, the two large surfaces of the battery cell 110 exchange heat with the two heat exchange plates respectively.

[0107] In some embodiments, the battery includes a plurality of heat exchange plates arranged in a Y-direction along the thickness of the battery cell 110. Battery cells 110 are disposed between adjacent heat exchange plates.

[0108] In some embodiments, the battery cell 110 includes a first tab 21, a second tab 22, a first adapter 50, and a second adapter 60. The first tab 21 and the second tab 22 have opposite polarities. The first adapter 50 is connected to the first tab 21 to form a first connection area 51, and the second adapter 60 is connected to the second tab 22 to form a third connection area.

[0109] In some embodiments, the battery device 100 further includes a heat-conducting element 120, which conducts heat generated in the first connection area 51 to the outside environment. For example, the heat-conducting element 120 conducts heat generated in the first connection area 51 to a heat exchange plate. Alternatively, the heat-conducting element 120 conducts heat generated in the first connection area 51 to the housing 400 of the battery device 100 or the external environment. It is understood that when the heat-conducting element 120 overlaps with the first connection area 51 in the thickness direction Y of the first wall portion 12a, the distance between the heat-conducting element 120 and the first connection area 51 can be shortened, allowing heat generated in the first connection area 51 to be conducted to the heat-conducting element 120 via the first wall portion 12a of the battery cell 110, and then dissipated by the heat-conducting element 120. The heat-conducting element 120 can directly contact the first wall portion 12a, or it can indirectly contact the first wall portion 12a through other thermally conductive materials.

[0110] The heat-conducting component 120 can conduct heat generated only in the first connection area 51, heat generated only in the third connection area 61, or heat generated in both the first connection area 51 and the third connection area 61 simultaneously.

[0111] As an example, the first connection area 51 and the third connection area 61 of the same battery cell 110 can both be heated by the heat conductor 120, or only the first connection area 51 can be heated by the heat conductor 120.

[0112] As an example, for two adjacent battery cells 110, the heat conductor 120 can simultaneously conduct heat from the first connection area 51 of both battery cells 110, or simultaneously conduct heat from the first connection area 51 of one battery cell 110 and the third connection area 61 of the other battery cell 110. It can also simultaneously conduct heat from the first connection area 51 and the third connection area 61 of both battery cells 110.

[0113] In some embodiments, the heat-conducting element 120 includes a heat exchange tube. Exemplarily, the heat exchange tube is a flat tube.

[0114] In some embodiments, the heat-conducting element 120 has a flow channel inside; when the heat exchange medium flows through the flow channel, it exchanges heat with the first connection area 51 through the heat-conducting element 120 to remove the heat generated in the first connection area 51.

[0115] Optionally, the side of the heat-conducting element 120 facing the first wall portion 12a can be a thick-walled structure. The heat-conducting element 120 provides a certain strength to the first wall portion 12a of the battery cell 110, thereby improving the vibration resistance of the battery device 100.

[0116] Reference Figures 3 to 7 In some embodiments, the battery cell 110 includes a housing 10 and an electrode assembly 20, at least a portion of which is housed within the housing 10.

[0117] For example, the housing 10 is a hollow structure, with an internal space for accommodating the electrode assembly 20 and the electrolyte. The shape of the housing 10 can be determined according to the specific shape of the electrode assembly 20. For example, if the electrode assembly 20 is a cuboid structure, a cuboid housing 10 can be used.

[0118] In some embodiments, the housing 10 includes a housing 11 and an end cap 12, the housing 11 having an opening, and the end cap 12 being connected to the housing 11 and covering the opening.

[0119] The housing 11 is a component used to fit the end cap 12 to form the internal cavity of the battery cell 110, which can be used to accommodate the electrode assembly 20, electrolyte and other components.

[0120] The housing 11 and the end cap 12 can be separate components. For example, an opening can be provided on the housing 11, and the end cap 12 can be used to close the opening to form an internal cavity for the battery cell 110.

[0121] The housing 11 can have various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 11 can be determined according to the specific shape and size of the electrode assembly 20. The material of the housing 11 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc., and this application embodiment does not impose any special limitations on this.

[0122] The shape of the end cap 12 can be adapted to the shape of the housing 11 to fit the housing 11. The material of the end cap 12 can be the same as or different from the material of the housing 11. Optionally, the end cap 12 can be made of a material with a certain hardness and strength (such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.), so that the end cap 12 is not easily deformed when subjected to compression and impact, so that the battery cell 110 can have higher structural strength and improve reliability.

[0123] The end cap 12 is connected to the housing 11 by welding, bonding, snap-fitting or other means.

[0124] The housing 11 may be open at one end or open at both ends. In some examples, the housing 11 may be a structure with an opening on one side, and one end cap 12 is provided to cover the housing 11. In other examples, the housing 11 may also be a structure with openings on both sides, and two end caps 12 are provided, with the two end caps 12 respectively covering the two openings of the housing 11.

[0125] Electrode assembly 20 is a component in the battery cell 110 where electrochemical reactions occur. The housing 11 may contain one or more electrode assemblies 20.

[0126] In some embodiments, the electrode assembly 20 includes a positive electrode and a negative electrode. During the charging and discharging process of the battery cell 110, active ions (e.g., lithium ions) are inserted and extracted back and forth between the positive and negative electrode.

[0127] In some embodiments, the electrode assembly 20 further includes a separator membrane disposed between the positive electrode and the negative electrode, which can prevent short circuit between the positive and negative electrodes while allowing active ions to pass through.

[0128] In some embodiments, the positive electrode sheet may include a positive current collector and a positive electrode film layer disposed on at least one surface of the positive current collector. Exemplarily, the portion of the positive current collector without the positive electrode film layer may serve as a positive electrode tab.

[0129] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction Y, and the positive electrode film layer is disposed on either or both of the two opposite surfaces of the positive current collector.

[0130] In some embodiments, the negative electrode sheet may include a negative electrode current collector and a negative electrode film layer disposed on at least one surface of the negative electrode current collector. Exemplarily, the portion of the negative electrode current collector without the negative electrode film layer may serve as a negative electrode tab.

[0131] In some embodiments, the electrode assembly 20 includes an electrode body, a first tab 21, and a second tab 22, which extend from the electrode body. The first tab 21 and the second tab 22 have opposite polarities; in other words, one of the first tab 21 and the second tab 22 is a positive tab, and the other is a negative tab.

[0132] As an example, the positive electrode sheet has a portion coated with a positive electrode film layer for the positive current collector, a portion coated with a negative electrode film layer for the negative current collector, a positive electrode film layer, a negative electrode film layer, and a separator film constituting the electrode body. The positive and negative tabs can be led out from the same end of the electrode body, or they can be led out from opposite ends of the electrode body.

[0133] In some embodiments, the electrode assembly 20 is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0134] In some embodiments, the electrode assembly 20 has a stacked structure.

[0135] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0136] As an example, multiple positive electrode plates can be provided, and negative electrode plates can be folded to form multiple stacked folded segments, with a positive electrode plate sandwiched between adjacent folded segments.

[0137] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0138] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0139] As an example, the separator can be continuously arranged between any adjacent positive or negative electrode plates by folding or rolling.

[0140] In some embodiments, the battery cell 110 includes a first electrode terminal 30 and a second electrode terminal 40 that are insulated from each other. The first electrode terminal 30 is electrically connected to a first tab 21, and the second electrode terminal 40 is electrically connected to a second tab 22. The first electrode terminal 30 and the second electrode terminal 40 are used for electrical connection to an external circuit to enable charging or discharging of the battery cell 110.

[0141] As an example, the first electrode terminal 30 may be a separately formed component that is mounted on the housing 10. Alternatively, the first electrode terminal 30 may also be part of the housing 10.

[0142] As an example, the second electrode terminal 40 may be a separately formed component that is mounted on the housing 10. Alternatively, the second electrode terminal 40 may also be part of the housing 10.

[0143] In some embodiments, the first electrode terminal 30 and the second electrode terminal 40 are both disposed on the end cap 12. As an example, the end cap 12, the first electrode terminal 30 and the second electrode terminal 40 can be pre-assembled together and then assembled with the electrode assembly 20 and the housing 11.

[0144] For example, the battery cell 110 includes an end cap 12 assembly, which includes an end cap 12, a first electrode terminal 30, and a second electrode terminal 40. Optionally, both the first electrode terminal 30 and the second electrode terminal 40 are insulated from the end cap 12. Optionally, the first electrode terminal 30 is riveted to the end cap 12, and the second electrode terminal 40 is riveted to the end cap 12.

[0145] Please see Figures 3 to 6This application provides a battery cell 110. The battery cell 110 includes a housing 10, an electrode assembly 20, a first electrode terminal 30, and a first adapter 50. The housing 10 includes a first wall portion 12a. The electrode assembly 20 is housed within the housing 10 and includes a first tab 21. The first electrode terminal 30 is disposed on the first wall portion 12a. The first adapter 50 connects the first electrode terminal 30 and the first tab 21. The first adapter 50 is connected to the first tab 21 and forms a first connection area 51. In the thickness direction Y of the first wall portion 12a, the first connection area 51 does not overlap with the first electrode terminal 30. The first connection area 51 is configured to overlap with a heat-conducting member 120 located outside the first wall portion 12a in the thickness direction Y of the first wall portion 12a.

[0146] The first wall portion 12a can be an end cap 12 or a wall of the housing 11.

[0147] The first electrode tab 21 can be either a positive or negative electrode tab. The polarity of the first electrode terminal 30 corresponds to the polarity of the first electrode tab 21.

[0148] The first electrode terminal 30 and the first electrode tab 21 are connected via the first adapter 50.

[0149] The first electrode terminal 30 can be one or more.

[0150] As an example, in the thickness direction Y of the first wall portion 12a, the first electrode tab 21 is located on the side of the electrode body facing the first wall portion 12a.

[0151] At least a portion of the first tab 21 overlaps with at least a portion of the first adapter 50 to form a first connection area 51. The overlapping area of ​​the first tab 21 and the first adapter 50 will generate contact resistance. A larger resistance will generate more heat when current passes through. Furthermore, the current density of the overlapping area of ​​the first tab 21 and the first adapter 50 is higher than that of other areas of the first tab 21 and the first adapter 50. The high current density will increase the power loss of the overlapping area, thereby generating more heat.

[0152] During battery cycling, current flows through the first tab 21, the first adapter 50, and the first electrode terminal 30, causing heat generation in the first connection area 51. The first connection area 51 can overlap with the heat-conducting element 120 in the thickness direction Y, thereby shortening the heat conduction path between the first connection area 51 and the heat-conducting element 120, improving the heat dissipation capacity of the battery cell 110, reducing the risk of thermal runaway during use and charging, reducing the temperature rise of the battery cell 110, and improving the cycle performance and cycle life of the battery cell 110. In the thickness direction Y, the first connection area 51 and the first electrode terminal 30 do not overlap, so that while the first connection area 51 and the heat-conducting element 120 overlap in the thickness direction Y, the possibility of interference between the heat-conducting element 120 and the first electrode terminal 30 is reduced. This is beneficial to increase the arrangement space of the heat-conducting element 120 on the outside of the first wall portion 12a, which helps to increase the size of the heat-conducting element 120, thereby increasing the thermal conductivity of the heat-conducting element 120 and improving the heat dissipation efficiency of the battery cell 110.

[0153] In some embodiments, the heat-conducting element 120 does not overlap with the first electrode terminal 30 in the thickness direction Y of the first wall portion 12a.

[0154] Optionally, the heat-conducting component 120 may include a heat exchange plate or a thermally conductive adhesive. For example, the heat exchange plate is a water-cooled plate. For example, the thermally conductive adhesive is an organosilicon thermally conductive adhesive, an epoxy resin thermally conductive adhesive, etc. When the heat-conducting component 120 is a heat exchange plate, the heat exchange plate can directly contact the outer surface of the first wall portion 12a. When the heat-conducting component 120 is a thermally conductive adhesive, the thermally conductive adhesive can be directly applied to the outer surface of the first wall portion 12a. The side of the heat-conducting component 120 facing away from the first wall portion 12a may contact the housing 400 of the battery device 100, or it may not contact other structures.

[0155] In some alternative embodiments, the housing 10 includes a housing 11 and an end cap 12, the housing 11 having an opening, and the end cap 12 being connected to the housing 11 and covering the opening. The end cap 12 is a first wall portion 12a.

[0156] Compared to the housing 11, the end cap 12 usually has a larger thickness; placing the first electrode terminal 30 on the end cap 12 can improve the connection strength between the first electrode terminal 30 and the end cap 12, enhance the stability of the first electrode terminal 30, and reduce the risk of the first electrode terminal 30 shifting.

[0157] During the production of the battery cell 110, the first electrode terminal 30 and the end cap 12 can be pre-assembled and then assembled with the housing 11, electrode assembly 20, and other components. The first electrode terminal 30 and the end cap 12 are supplied as a single piece, which simplifies the assembly process.

[0158] In some alternative embodiments, please refer to Figures 3 to 6The outer casing 10 also includes two second wall portions 11a disposed opposite each other along the length direction X of the first wall portion 12a, with the two second wall portions 11a located on both sides of the first wall portion 12a along the length direction X. The first electrode terminal 30 includes a first terminal portion 31 located outside the first wall portion 12a, the distance between the first terminal portion 31 and the second wall portion 11a is d, and the dimension of the first wall portion 12a along its own length direction X is D, where d and D satisfy the relationship 0.25≤d / D≤0.45.

[0159] Optionally, the outer casing 10 includes a housing 11 and an end cap 12. A first wall portion 12a is the end cap 12, and a second wall portion 11a is part of the housing 11. Taking a cuboid shape as an example, the housing 11 is a cuboid with an opening. The bottom surfaces of the first wall portion 12a and the housing 11 are opposite each other, and the second wall portion 11a is a side surface of the housing 11. Optionally, the thickness direction Y of the first wall portion 12a is the height direction of the outer casing 10, the length direction X of the first wall portion 12a is the length direction X of the outer casing 10, and the width direction of the first wall portion 12a is the width direction of the outer casing 10.

[0160] Optionally, the housing 11 further includes a third wall portion, which is disposed opposite to each other along the second direction. The two third walls portions, the two second walls portions 11a, and the bottom surface enclose and form a housing 11 with an opening. Optionally, the area of ​​the third wall portion is larger than the area of ​​the second wall portion 11a.

[0161] The first terminal portion 31 includes a first edge 31a and a second edge 31b disposed opposite to each other along the length direction X of the first wall portion 12a. When both the first electrode terminal 30 and the second electrode terminal 40 are disposed on the first wall portion 12a, the first electrode terminal 30 and the second electrode terminal 40 are disposed at intervals. The second electrode terminal 40 includes a fourth terminal portion located outside the first wall portion 12a. The fourth terminal portion includes a third edge and a fourth edge disposed opposite to each other along the length direction X of the first wall portion 12a. The first edge 31a of the first terminal portion 31 is close to the first first wall portion 12a of the two second wall portions 11a, and the fourth edge of the second terminal portion 32 is close to the second first wall portion 12a of the two second wall portions 11a.

[0162] The distance between the first terminal portion 31 and the second wall portion 11a can be the minimum distance between the plane containing the first edge 31a and the first second wall portion 11a. Similarly, the distance between the fourth terminal portion and the second wall portion 11a can be the minimum distance between the plane containing the fourth edge and the second second wall portion 11a. The distance between the fourth terminal portion and the second wall portion 11a can be the same as the distance between the first terminal portion 31 and the second wall portion 11a; for example, the first electrode terminal 30 and the second electrode terminal 40 are symmetrically arranged along the central axis of the length direction X of the housing 10. Alternatively, they can be different.

[0163] As an example, d / D is 0.25, 0.3, 0.35, 0.4, or 0.45.

[0164] The ratio of the dimension between the first terminal portion 31 and the second wall portion 11a to the dimension of the first wall portion 12a in the length direction X is greater than or equal to 0.25. This allows for a larger area to be reserved in the first terminal portion 31 for arranging the heat-conducting component 120, thereby increasing the contact area between the heat-conducting component 120 and the battery cell 110, improving the heat dissipation efficiency of the battery cell 110, and enhancing the cycle performance and reliability of the battery cell 110. The ratio of the dimension between the first terminal portion 31 and the second wall portion 11a to the dimension of the first wall portion 12a in the length direction X is less than or equal to 0.45, which allows for the provision of installation space for other components of the battery cell 110.

[0165] In some alternative embodiments, please refer to Figures 3 to 7 The battery cell 110 also includes a heat-conducting structure 70, through which the first connection area 51 and the first wall portion 12a are connected.

[0166] Optionally, the thermally conductive structure 70 may have electrolyte resistance properties.

[0167] For example, the thermally conductive structure 70 may include an epoxy thermally conductive adhesive.

[0168] Optionally, the surface of the first connection area 51 facing the first wall portion 12a is connected to the side of the first wall portion 12a facing the electrode assembly 20 by means of thermally conductive adhesive, so as to improve the connection stability between the first adapter 50 and the first wall portion 12a.

[0169] Optionally, the second adapter 60 connects the second electrode terminal 40 and the second tab 22. The second adapter 60 is connected to the second tab 22 to form a second connection area 52. The surface of the second connection area 52 facing the first wall portion 12a is connected to the side of the first wall portion 12a facing the electrode assembly 20 by thermally conductive adhesive to improve the connection stability between the second adapter 60 and the first wall portion 12a.

[0170] In this embodiment, a heat-conducting structure 70 is provided so that the heat generated in the first connection area 51 is conducted through the heat-conducting structure 70 to the first wall portion 12a, and then through the first wall portion 12a to the heat-conducting component 120, thereby shortening the heat conduction path between the first connection area 51 and the heat-conducting component 120 and improving the heat dissipation efficiency of the battery cell 110.

[0171] In some alternative embodiments, please refer to Figures 3 to 6 The battery cell 110 also includes an insulating member 80, which is located on the side of the first wall portion 12a facing the electrode assembly 20, and at least part of the insulating member 80 is located between the heat-conducting structure 70 and the first wall portion 12a.

[0172] Optionally, the insulating element 80 includes insulating plastic.

[0173] An insulating element 80 is provided between the heat-conducting structure 70 and the first wall portion 12a to further improve the insulation performance between the adapter and the first wall portion 12a, reduce the possibility of short circuit between the electrode tab and the first wall portion 12a, and improve the reliability of the battery cell 110.

[0174] In some alternative embodiments, please refer to Figures 3 to 6 The first wall portion 12a is provided with a first electrode lead-out hole H. The first electrode terminal 30 includes a first terminal portion 31 and a second terminal portion 32. At least a portion of the second terminal portion 32 is accommodated in the first electrode lead-out hole H, and the first terminal portion 31 is connected to the first adapter 50 through the second terminal portion 32. The second terminal portion 32 and the first adapter 50 are integrally formed.

[0175] As an example, the first electrode lead-out hole H extends through the first wall portion 12a along the thickness direction Y of the first wall portion 12a.

[0176] The first electrode lead-out hole H can be one or more.

[0177] The first electrode lead-out hole H can be a round hole, a rectangular hole, an elliptical hole, a racetrack-shaped hole, or a hole of other shapes.

[0178] By providing a first electrode lead-out hole H, an electrical connection between the first terminal portion 31 and the first electrode tab 21 can be achieved.

[0179] The second terminal portion 32 and the first terminal portion 31 can be integrally formed. Alternatively, the second terminal portion 32 and the first terminal portion 31 can be formed independently and fixedly connected by welding, snap-fitting, bonding or other methods.

[0180] The second terminal 32 can be one or more.

[0181] The materials of the second terminal portion 32 and the first terminal portion 31 may be the same or different.

[0182] The first wall portion 12a can limit the second terminal portion 32 in the radial direction of the first electrode lead-out hole H. The first terminal portion 31 and the first adapter 50 can clamp the first wall portion 12a from both sides, thereby achieving fixation in the thickness direction Y.

[0183] In some embodiments, the second terminal portion 32 is riveted to the first terminal portion 31.

[0184] In some embodiments, the first terminal portion 31 and the first connection area 51 are at least partially non-overlapping in the thickness direction Y of the first wall portion 12a.

[0185] In some embodiments, the second terminal portion 32 and the first connection area 51 are at least partially non-overlapping in the thickness direction Y of the first wall portion 12a.

[0186] In some embodiments, in the thickness direction Y of the first wall portion 12a, the first terminal portion 31 and the heat-conducting member 120 on the outer side of the first wall portion 12a do not overlap.

[0187] In some embodiments, the second terminal portion 32 and the first adapter 50 are integrally formed, which can improve the connection strength between the second terminal portion 32 and the first adapter 50, reduce resistance, and improve overcurrent capacity.

[0188] For example, the second terminal portion 32 protrudes from the surface of the first adapter 50 facing the first wall portion 12a.

[0189] In some alternative embodiments, please refer to Figures 3 to 6 The first adapter 50 also includes a second connecting area 52 and a first bending area 53 connecting the first connecting area 51 and the second connecting area 52. The first connecting area 51, the first bending area 53, and the second connecting area 52 are arranged sequentially along the length direction X of the first wall portion 12a, and both the first connecting area 51 and the second connecting area 52 are bent relative to the first bending area 53. The second connecting area 52 and the second terminal portion 32 are integral structures.

[0190] Optionally, the first connection area 51 is located on the side of the second connection area 52 away from the second adapter 60.

[0191] During cycling, the battery cell 110 expands, which stretches the first adapter 50. The first bending area 53 deforms to accommodate the expansion and deformation of the battery cell 110, thereby reducing the risk of the connection between the first connection area 51 and the first tab 21, as well as the connection between the second connection area 52 and the first electrode terminal 30, and improving the reliability of the battery cell 110.

[0192] Optionally, the second adapter 60 may include a third connecting region 61, a fourth connecting region 62, and a second bending region 63. The second adapter 60 is connected to the second electrode tab 22 to form the third connecting region 61, and the fourth connecting region 62 is electrically connected to the second electrode terminal 40. The third connecting region 61, the second bending region 63, and the fourth connecting region 62 are arranged sequentially along the length direction X of the first wall portion 12a. Both the third connecting region 61 and the fourth connecting region 62 are bent relative to the second bending region 63.

[0193] Optionally, the third connection area 61 is located on the side of the fourth connection area 62 away from the first adapter 50.

[0194] The above-described configuration in this embodiment of the application helps to reduce the space occupied by the first adapter 50 in the thickness direction Y and improve the energy density of the battery cell 110.

[0195] In some alternative embodiments, please refer to Figures 3 to 6 In the thickness direction Y of the first wall portion 12a, at least a portion of the first bending region 53 overlaps with the first terminal portion 31 to increase the size of the first connection region 51, thereby increasing the connection area between the first tab 21 and the first adapter 50 and increasing the overall current carrying capacity of the battery cell 110.

[0196] For example, in the thickness direction Y of the first wall portion 12a, a portion of the first bending region 53 overlaps with the first terminal portion 31. Alternatively, the projection of the first bending region 53 in the thickness direction Y of the first wall portion 12a lies within the projection of the first terminal portion 31 in the thickness direction Y of the first wall portion 12a.

[0197] Optionally, in the thickness direction Y of the first wall portion 12a, at least a portion of the second bending region 63 overlaps with the third terminal portion of the second electrode terminal 40 located outside the first wall portion 12a.

[0198] In some alternative embodiments, please refer to Figures 3 to 6 The battery cell 110 also includes a second electrode terminal 40 and a second adapter 60. The second electrode terminal 40 is disposed on the first wall portion 12a. The electrode assembly 20 also includes a second electrode tab 22 with the opposite polarity to the first electrode tab 21. The second adapter 60 connects the second electrode terminal 40 and the second electrode tab 22, and the second adapter 60 is connected to the second electrode tab 22 to form a third connection area 61. In the thickness direction Y of the first wall portion 12a, the third connection area 61 does not overlap with the second electrode terminal 40, and the third connection area 61 is configured to overlap with the heat-conducting member 120 located outside the first wall portion 12a in the thickness direction Y of the first wall portion 12a.

[0199] The second electrode tab 22 can be either a negative or a positive electrode tab. The polarity of the second electrode terminal 40 corresponds to the polarity of the second electrode tab 22.

[0200] The second electrode terminal 40 is connected to the second electrode tab 22 via the second adapter 60.

[0201] The second electrode terminal 40 can be one or more.

[0202] As an example, in the thickness direction Y of the first wall portion 12a, the second electrode tab 22 is located on the side of the electrode body facing the first wall portion 12a.

[0203] At least a portion of the second tab 22 overlaps with at least a portion of the second adapter 60 to form a first connection area 51. The overlapping area of ​​the second tab 22 and the second adapter 60 will generate contact resistance. A larger resistance will generate more heat when current passes through it. Furthermore, the current density in the overlapping area of ​​the second tab 22 and the second adapter 60 is higher than that in other areas of the second tab 22 and the second adapter 60. The high current density will increase the power loss in the overlapping area, thereby generating more heat.

[0204] During battery cycling, current flows through the second tab 22, the second adapter 60, and the second electrode terminal 40, causing heat generation in the third connection region 61. The third connection region 61 can overlap with the heat-conducting element 120 in the thickness direction Y, thereby shortening the heat conduction path between them, improving the heat dissipation capacity of the battery cell 110, reducing the risk of thermal runaway during use and charging, decreasing the temperature rise of the battery cell 110, and improving its cycle performance and cycle life. In the thickness direction Y, the third connection region 61 and the second electrode terminal 40 do not overlap. This allows the third connection region 61 and the heat-conducting element 120 to overlap in the thickness direction Y, while reducing the possibility of interference between the heat-conducting element 120 and the second electrode terminal 40. This increases the arrangement space of the heat-conducting element 120 outside the first wall portion 12a, helps increase the size of the heat-conducting element 120, thereby increasing its thermal conductivity and improving the heat dissipation efficiency of the battery cell 110.

[0205] In some embodiments, the heat-conducting element 120 does not overlap with the second electrode terminal 40 in the thickness direction Y of the first wall portion 12a.

[0206] In some alternative embodiments, please refer to Figures 3 to 6 In the thickness direction Y of the first wall portion 12a, the first connection area 51 is located on the side of the first electrode terminal 30 facing away from the second electrode terminal 40; and / or, in the thickness direction Y of the first wall portion 12a, the third connection area 61 is located on the side of the second electrode terminal 40 facing away from the first electrode terminal 30.

[0207] In some examples, in the thickness direction Y of the first wall portion 12a, the first connection area 51 is located on the side of the first electrode terminal 30 facing away from the second electrode terminal 40. In other examples, in the thickness direction Y of the first wall portion 12a, the third connection area 61 is located on the side of the second electrode terminal 40 facing away from the first electrode terminal 30. In still other examples, in the thickness direction Y of the first wall portion 12a, the first connection area 51 is located on the side of the first electrode terminal 30 facing away from the second electrode terminal 40, and the third connection area 61 is located on the side of the second electrode terminal 40 facing away from the first electrode terminal 30, so that the first electrode terminal 30 and the second electrode terminal 40 are located in the middle region of the first wall portion 12a. When the battery cell 110 experiences thermal runaway, causing the explosion-proof valve to open, the second terminal portion 32 of the first electrode terminal 30 and the third terminal portion of the second electrode terminal 40 can provide support, reducing the possibility that the electrode assembly 20 may move towards the explosion-proof valve and block the exhaust passage.

[0208] Optionally, the first electrode terminal 30 and the second electrode terminal 40 are symmetrically distributed on the first wall portion 12a along the central axis of the length direction X of the first wall portion 12a.

[0209] Optionally, the projections of the first connecting region 51 in the thickness direction Y and the third connecting region 61 in the thickness direction Y are symmetrically distributed along the central axis of the length direction X of the first wall portion 12a.

[0210] For example, in the thickness direction Y of the first wall portion 12a, the first electrode terminal 30 and the second electrode terminal 40 are located between the first connection area 51 and the third connection area 61.

[0211] In some other embodiments, the first electrode terminal 30 and the second electrode terminal 40 may be asymmetrically distributed. The first connection region 51 and the third connection region 61 may also be asymmetrically distributed.

[0212] As an example, in the thickness direction Y of the first wall portion 12a, the first electrode terminal 30 is located between the first connection region 51 and the third connection region 61, and the second electrode terminal 40 is located on the side of the third connection region 61 opposite to the first electrode terminal 30. Alternatively, in the thickness direction Y of the first wall portion 12a, the second electrode terminal 40 is located between the first connection region 51 and the third connection region 61, and the first electrode terminal 30 is located on the side of the first connection region 51 opposite to the second electrode terminal 40.

[0213] During the use of the battery cell 110, the deformation in the central area of ​​the large surface of the battery cell 110 is greater than the deformation in the edge area. In this embodiment, the electrode terminals are positioned closer to the central area of ​​the large surface of the battery cell 110, and the tabs are positioned closer to the edge area. This helps reduce the pulling force on the tabs due to expansion, reducing the possibility of solder cracking caused by pulling on the tabs and adapters, and improving the reliability of the battery cell 110. Simultaneously, the electrode terminals also enhance the strength of the central area of ​​the first wall portion 12a of the battery cell 110, thereby improving the overall strength of the battery cell 110.

[0214] In some alternative embodiments, please refer to Figures 3 to 6 The dimension of the battery cell 110 in the thickness direction Y of the first wall portion 12a is 150mm to 350mm.

[0215] The dimension of the battery cell 110 in the thickness direction Y of the first wall portion 12a can be the overall height of the battery cell 110. Optionally, a heat exchanger can be provided on the side of the housing 11 facing away from the first wall portion 12a, and a heat conduction element 120 can be provided on the side of the first wall portion 12a facing away from the housing 11. This allows the battery cell 110 to have a heat exchanger on one side along the thickness direction Y of the first wall portion 12a and a heat conduction element 120 on the other side, so that the heat generated inside the battery cell 110 is discharged through both sides along the thickness direction Y of the first wall portion 12a, further increasing the heat exchange efficiency of the battery cell 110.

[0216] Optionally, the dimension of the battery cell 110 in the thickness direction Y of the first wall portion 12a can be 150mm, 200mm, 250mm, 300mm or 350mm.

[0217] In this embodiment, the total capacity of the battery cell 110 is increased and its range is improved by setting the dimension of the battery cell 110 in the thickness direction Y of the first wall portion 12a to be greater than or equal to 150 mm. Conversely, by setting the dimension of the battery cell 110 in the thickness direction Y of the first wall portion 12a to be less than or equal to 350 mm, the heat transfer path inside the battery cell 110 is shortened, reducing the possibility of uneven temperature distribution inside the battery cell 110.

[0218] Secondly, embodiments of this application provide a battery device 100, including a battery cell 110 as described in any of the foregoing embodiments and a heat-conducting element 120. At least a portion of the heat-conducting element 120 is located on the side of the first wall portion 12a opposite to the electrode assembly 20 and conducts heat to the first connection region 51.

[0219] Thirdly, embodiments of this application provide an electrical device, including the battery device 100 in any of the foregoing embodiments, the battery device 100 being used to provide electrical energy.

[0220] According to some embodiments of this application, please refer to Figures 3 to 7 The battery cell 110 includes a housing 10, an electrode assembly 20, a first electrode terminal 30, and a first adapter 50. The housing 10 includes a first wall portion 12a. The electrode assembly 20 is housed within the housing 10 and includes a first tab 21. The first electrode terminal 30 is disposed on the first wall portion 12a. The first adapter 50 connects the first electrode terminal 30 and the first tab 21, and the first adapter 50 is connected to the first tab 21 to form a first connection area 51. In the thickness direction Y of the first wall portion 12a, the first connection area 51 does not overlap with the first electrode terminal 30, and the first connection area 51 is configured to overlap with a heat-conducting element 120 located outside the first wall portion 12a in the thickness direction Y of the first wall portion 12a.

[0221] The outer casing 10 also includes two second wall portions 11a disposed opposite each other along the length direction X of the first wall portion 12a, with the two second wall portions 11a located on both sides of the first wall portion 12a along the length direction X of the first wall portion 12a. The first electrode terminal 30 includes a first terminal portion 31 located outside the first wall portion 12a, the distance between the first terminal portion 31 and the second wall portion 11a is d, and the dimension of the first wall portion 12a along its own length direction X is D, where d and D satisfy the relationship 0.25≤d / D≤0.45.

[0222] The battery device 100 also includes a thermally conductive structure 70 and an insulating member 80. The insulating member 80 is located on the side of the first wall portion 12a facing the electrode assembly 20, and at least a portion of the insulating member 80 is located between the thermally conductive structure 70 and the first wall portion 12a. The thermally conductive structure 70 is located between the insulating member 80 and the first connection area 51.

[0223] The first adapter 50 also includes a second connecting area 52 and a first bending area 53 connecting the first connecting area 51 and the second connecting area 52. The first connecting area 51, the first bending area 53 and the second connecting area 52 are arranged sequentially along the length direction X of the first wall portion 12a, and both the first connecting area 51 and the second connecting area 52 are bent relative to the first bending area 53. The second connecting area 52 is electrically connected to the second terminal portion 32.

[0224] At least a portion of the first bending region 53 overlaps with the first terminal portion 31 in the thickness direction Y of the first wall portion 12a.

[0225] The battery cell 110 also includes a second electrode terminal 40 and a second adapter 60. The second electrode terminal 40 is disposed on the first wall portion 12a; the electrode assembly 20 also includes a second electrode tab 22 with the opposite polarity to the first electrode tab 21; the second adapter 60 connects the second electrode terminal 40 and the second electrode tab 22, and the second adapter 60 is connected to the second electrode tab 22 to form a third connection area 61. In the thickness direction Y of the first wall portion 12a, the third connection area 61 does not overlap with the second electrode terminal 40, and the third connection area 61 is configured to overlap with the heat-conducting member 120 located outside the first wall portion 12a in the thickness direction Y of the first wall portion 12a.

[0226] In the thickness direction Y of the first wall portion 12a, the first connection area 51 is located on the side of the first electrode terminal 30 facing away from the second electrode terminal 40; and in the thickness direction Y of the first wall portion 12a, the third connection area 61 is located on the side of the second electrode terminal 40 facing away from the first electrode terminal 30.

[0227] The outer casing 10 includes a housing 11 and an end cap 12. The housing 11 has an opening, and the end cap 12 is connected to the housing 11 and covers the opening. The end cap 12 is a first wall portion 12a.

[0228] The battery device 100 includes a battery cell 110 as described in any of the preceding embodiments and a heat conductor 120. At least a portion of the heat conductor 120 is located on the side of the first wall portion 12a opposite to the electrode assembly 20 and conducts heat to the first connection region 51.

[0229] 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 by, The battery cell comprises: a housing comprising a first wall portion; an electrode assembly accommodated in the housing and comprising a first tab; a first electrode terminal arranged at the first wall portion; a first adapter connecting the first electrode terminal and the first tab, the first adapter being connected to the first tab and forming a first connection region, the first connection region not overlapping the first electrode terminal in a thickness direction of the first wall portion, the first connection region being configured to overlap a heat conduction member located outside the first wall portion in the thickness direction of the first wall portion.

2. The battery cell of claim 1, wherein, The housing further comprises two second wall portions arranged opposite along a length direction of the first wall portion, the two second wall portions being arranged on both sides of the first wall portion along the length direction of the first wall portion; the first electrode terminal comprises a first terminal portion located outside the first wall portion, a distance between the first terminal portion and the second wall portion being d, and a size of the first wall portion along the length direction of the first wall portion being D, d and D satisfying a relationship of 0.25≤d / D≤0.

45.

3. The battery cell of claim 1, wherein, The battery cell further comprises a heat conduction structure, the first connection region being connected to the first wall portion through the heat conduction structure.

4. The battery cell of claim 3, wherein, The battery cell further comprises an insulating member located on a side of the first wall portion facing the electrode assembly, at least part of the insulating member being located between the heat conduction structure and the first wall portion.

5. The battery cell of claim 1, wherein, The first wall portion is provided with a first electrode lead-out hole, the first electrode terminal comprises a first terminal portion and a second terminal portion, at least part of the second terminal portion being accommodated in the first electrode lead-out hole, and the first terminal portion being connected to the first adapter through the second terminal portion; wherein the second terminal portion and the first adapter are an integrally formed structure.

6. The battery cell of claim 5, wherein, The first adapter further comprises a second connection region and a first bending region connecting the first connection region and the second connection region, the first connection region, the first bending region and the second connection region being arranged in sequence along the length direction of the first wall portion, and the first connection region and the second connection region being arranged in a bent manner relative to the first bending region, the second connection region and the second terminal portion being an integral structure.

7. The battery cell of claim 6, wherein, In the thickness direction of the first wall portion, at least part of the first bending region overlaps the first terminal portion.

8. The battery cell of claim 1, wherein, The battery cell further comprises: a second electrode terminal arranged at the first wall portion; the electrode assembly further comprises a second tab opposite in polarity to the first tab; a second adapter connecting the second electrode terminal and the second tab, the second adapter being connected to the second tab and forming a third connection region, the third connection region not overlapping the second electrode terminal in the thickness direction of the first wall portion, the third connection region being configured to overlap a heat conduction member located outside the first wall portion in the thickness direction of the first wall portion.

9. The battery cell of claim 8, wherein, In the thickness direction of the first wall portion, the first connection region is located on a side of the first electrode terminal facing away from the second electrode terminal; and / or, in the thickness direction of the first wall portion, the third connection region is located on a side of the second electrode terminal facing away from the first electrode terminal.

10. The battery cell of claim 1, wherein, The battery cell has a dimension of 150 mm to 350 mm in a thickness direction of the first wall portion.

11. The battery cell of any one of claims 1 to 10, wherein, The housing includes a case having an opening and an end cover connected to the case and covering the opening. The end cover is the first wall portion.

12. A battery device characterized by comprising: A battery cell as claimed in any one of claims 1 to 11. A heat conductive member at least partially located on a side of the first wall portion facing away from the electrode assembly and thermally conducting the first connection region.

13. An electrical device, characterized by A battery device as claimed in claim 12 for providing electric energy to the electric device.

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