Battery cell, battery, and electric device

Abstract

The application provides a battery monomer, a battery and a power utilization device. The battery monomer comprises: a shell (10) comprising a first wall; an electrode assembly (4) arranged in the shell (10), the electrode assembly (4) comprising an electrode main body (41) and a tab, and the tab being led out from the electrode main body (41); and a terminal assembly (3) comprising a connecting piece (31) and at least two terminals (30), the at least two terminals (30) are arranged on the first wall, the connecting piece (31) is arranged at least partially around the at least two terminals (30), the terminal (30) is arranged at least partially between the connecting piece (31) and the first wall along the thickness direction of the first wall, the connecting piece (31) is connected with the first wall, and the terminal (30) is electrically connected with the corresponding tab.

Description

Technical Field

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

[0002] Lithium-ion batteries, due to their advantages such as high energy density, high power density, high cycle life, and long storage time, are widely used in electric vehicles.

[0003] To achieve electrical connection between multiple battery cells, current batteries typically have positive and negative terminals placed on the end caps along the length of the battery cells near both ends. This type of end cap assembly has low assembly efficiency, resulting in low production efficiency for individual battery cells. Utility Model Content

[0004] The purpose of this application is to improve the production efficiency of battery cells.

[0005] According to a first aspect of this application, a battery cell is provided, comprising:

[0006] The outer shell, including the first wall;

[0007] An electrode assembly, housed within a housing, comprises an electrode body and tabs, the tabs extending from the electrode body; and

[0008] A terminal assembly includes a connector and at least two terminals, both of which are disposed on a first wall. The connector is at least partially disposed around the at least two terminals. The terminals are at least partially disposed between the connector and the first wall along the thickness direction of the first wall. The connector is connected to the first wall, and the terminals are electrically connected to corresponding tabs.

[0009] In this embodiment, the battery cell integrates at least two terminals and a connector into a terminal assembly, such that at least two terminals are located within the area enclosed by the same connector. During assembly, it can be mounted as a single component on the first wall, reducing the number of parts related to terminal mounting and simplifying the terminal production and assembly process, thereby improving production efficiency and reducing costs. The connector is connected to the first wall, and the terminals are at least partially disposed between the connector and the first wall along the thickness direction of the first wall. The connector can limit the position of the terminals along the thickness direction of the first wall.

[0010] Moreover, this structure can reduce the number of openings on the first wall and improve the strength of the first wall where the terminals are installed.

[0011] Furthermore, when multiple battery cells are grouped together to form a battery module, conventional battery cells have two terminals located on the end cap near both ends along the first direction. When the end cap is pressed down from the outer area of ​​the terminals by a pressure strip, the space is limited, allowing only a small width of the pressure strip, resulting in poor pressing effect. However, the solution of this application is to use an integrated terminal assembly, which can reduce the space occupied on the first wall, allowing for the use of a wider pressure strip and optimizing the pressing effect.

[0012] In some embodiments, the connector is a closed ring structure that surrounds at least two terminals.

[0013] This embodiment designs the connector as a closed ring structure, which can improve its own structural strength, eliminate the need to rely on other structures in the terminal assembly to keep the connector as a whole structure, and improve the reliability of the connection between the connector and the first wall, thereby better maintaining the position of the terminal through the connector.

[0014] In some embodiments, at least two terminals have opposite polarities, and the terminal assembly further includes a first insulating member, which is at least partially disposed between the terminals with opposite polarities.

[0015] The terminal assembly of this embodiment improves insulation performance and ensures the reliability of battery cell operation by providing a first insulating element between terminals with opposite polarities to maintain insulation between terminals with opposite polarities.

[0016] In some embodiments, the first insulating member is at least partially disposed between the terminal and the first wall, and / or the first insulating member is at least partially disposed between the terminal and the connector.

[0017] This embodiment enables insulation between the terminal and the first wall to be maintained when the connector is made of metal, by at least partially disposing the first insulating member between the terminal and the first wall, and by disposing the first insulating member between the terminal and the connector, insulation between the terminal and the connector can be maintained. Thus, insulation between multiple conductive components can be achieved through the first insulating member, improving insulation reliability and ensuring the reliability of the battery cell's operation.

[0018] In some embodiments, the terminal includes a main body and a protrusion, the protrusion being disposed on a sidewall of the main body and extending at least partially circumferentially along the terminal; the connector includes:

[0019] The base, connected to the first wall; and

[0020] A limiting part is connected to the base and is at least partially disposed on the side of the protrusion away from the first wall.

[0021] This embodiment provides a protrusion on the side wall of the main body of the terminal. When the connector is fixed to the first wall by the base, the protrusion can be limited by the limiting part to restrict the degree of freedom of the terminal to move outward along the thickness direction of the first wall, so as to reliably install the terminal on the first wall.

[0022] In some embodiments, the connector further includes:

[0023] A connecting part is provided between the base and the limiting part and is disposed opposite to the side wall of the protrusion.

[0024] The connector in this embodiment can connect the base and the limiting part by providing a connecting part. The connecting part is disposed opposite to the side wall of the protrusion, so that the limiting part can extend to the side of the protrusion away from the first wall, thereby limiting the protrusion by the limiting part.

[0025] In some embodiments, the connector further includes a transition portion connected between the limiting portion and the connecting portion.

[0026] This embodiment prevents stress concentration at the connection point between the limiting part and the connecting part by providing a transition part between them, thus optimizing the stress distribution of the connector and enabling more reliable installation of the terminal onto the first wall.

[0027] In some embodiments, the first wall is provided with a groove, and the base is at least partially received in the groove.

[0028] This embodiment accommodates the base within the groove, which minimizes the protrusion height of the terminal assembly relative to the first wall, facilitates the connection between the base and the first wall, and improves the connection strength between the base and the first wall.

[0029] In some embodiments, the mating surfaces of the base and the groove are connected by a weld; or

[0030] The first wall has a flange at the edge of the groove, with the flange at least partially located on the side of the base away from the bottom of the groove.

[0031] This embodiment achieves a convenient connection between the connector and the first wall by welding the mating surfaces of the base and the groove. The process is simple, and the groove can be directly formed on the first wall, reducing the processing difficulty. Furthermore, welding reduces the likelihood of deformation of the first wall. Alternatively, a flange can be provided at the edge of the groove to limit and fix the base, achieving a connection between the base and the first wall. The flange reliably limits the base, improving the reliability of the connection between the connector and the first wall.

[0032] In some embodiments, the first insulating member includes an annular portion surrounding at least two terminals and covering at least a portion of the outer side of the connector.

[0033] In this embodiment, the first insulating member, by providing an annular portion, can provide insulation protection to the outside of the connector in the circumferential direction and to the portion of the terminal that is higher than the protrusion, thereby ensuring the insulation performance of the terminal assembly.

[0034] In some embodiments, the first insulating member further includes an intermediate plate connected within the annular portion. The intermediate plate has two mounting holes spaced apart along a first direction, which is the length direction of the first wall. At least a portion of the terminal passes through the mounting holes and is electrically connected to the corresponding tab. The terminal protrudes from the annular portion.

[0035] In this embodiment, the first insulating member, by providing an intermediate plate within the annular portion, not only insulates and protects the connector but also supports the mounting terminals and improves the overall strength of the first insulating member. Furthermore, the terminals protrude from the annular portion, facilitating convenient electrical connection of the terminals of adjacent battery cells via a busbar during assembly.

[0036] In some embodiments, at least two terminals each include a body portion, the body portion comprising:

[0037] The first connecting part is configured to be electrically connected to other battery cells;

[0038] Among them, the two first connecting parts are arranged along the second direction, which is the width direction of the first wall.

[0039] In this embodiment, the main body of the terminal includes a first connecting portion, and two first connecting portions are arranged along a second direction. When battery cells are assembled, it is not necessary to misalign multiple busbars, which facilitates connection operations. For example, during welding, it is not necessary to repeatedly adjust the position of the welding tool along the first direction, thereby improving the efficiency of battery cell assembly. Moreover, since the first connecting portions of the two terminals in the terminal assembly jointly occupy the space of the first wall along the second direction, the length of the busbar can be shortened when connecting two adjacent first connecting portions through the busbar, reducing material consumption. In addition, each first connecting portion extends along the first direction and can be designed with a suitable extension length according to requirements to meet the width requirements of the busbar, thereby achieving a larger current carrying capacity.

[0040] In some embodiments, the body portion further includes:

[0041] The second connection part is configured to be electrically connected to the corresponding electrode tab, and the second connection part is connected to the first connection part;

[0042] In this configuration, the second connecting portions of each of the two terminals are arranged along a first direction, which is perpendicular to the second direction.

[0043] In this embodiment, the main body of the terminal includes a first connecting portion and a second connecting portion. The first connecting portion is used for electrical connection with other battery cells, and the second connecting portion is used for electrical connection with the tabs. This makes the areas of the terminal used for connection with the tabs and other battery cells independent of each other, which can improve the reliability of the electrical connection. For example, when welding is used to achieve electrical connection, it can prevent the two welding areas from affecting each other. Moreover, this structure is beneficial to increasing the area of ​​electrical connection between the terminal and the tabs, and also to increasing the area of ​​electrical connection between the terminal and the busbar.

[0044] In some embodiments, two terminals are provided, the two terminals have opposite polarities, and the terminal assembly further includes a first insulating member, the first insulating member including an isolation portion, the isolation portion including:

[0045] Two first partitions extend along a second direction and are disposed between a first connecting portion of one terminal and a second connecting portion of the other terminal; and

[0046] The second partition extends along the first direction and is disposed between the first connection portions of the two terminals, with both ends of the second partition connected to the ends of the two first partitions respectively.

[0047] In this embodiment, the first insulating member has an isolation portion between two terminals with opposite polarities, which can completely insulate and separate the two terminals with opposite polarities, thereby improving insulation performance and thus improving insulation reliability.

[0048] In some embodiments, the top surface of the isolation portion is further away from the first wall than the outer surface of the terminal.

[0049] The flush outer surface also ensures reliable insulation between the two terminals.

[0050] This embodiment raises the top surface of the isolation section above the outer surface of the terminal, increasing the creepage distance between the two terminals and thus improving the insulation performance between them. Furthermore, when multiple battery cells are grouped together, the terminals of adjacent battery cells are electrically connected via busbars. The isolation section can increase the creepage distance between adjacent busbars, thereby improving the insulation performance between them.

[0051] In some embodiments, the two terminals have opposite polarities, and the terminal assembly further includes a first insulating member, the first insulating member including an annular portion and an intermediate plate, the annular portion surrounding the two terminals and covering at least part of the outer side of the connector, the intermediate plate being connected to the inner wall of the annular portion near the end of the first wall along the thickness direction of the first wall, the intermediate plate having two mounting holes spaced apart along a first direction, a second connecting portion passing through the mounting holes, and the first connecting portion being located on the side of the intermediate plate away from the first wall.

[0052] In this embodiment, the intermediate plate is connected to the inner wall of the annular portion near the end of the first wall. On the one hand, this allows the terminal to be located closer to the first wall, reducing the protrusion height of the terminal relative to the first wall and thus reducing the space occupied. On the other hand, it provides a space for the first connecting portion, reducing the protrusion height of the first connecting portion from the annular portion.

[0053] In some embodiments, in the terminal assembly, one terminal has a first protrusion, and along the thickness direction of the first wall, the first protrusion is at least partially disposed on the side of the first connection portion of the other terminal away from the first wall.

[0054] This embodiment provides a first protrusion on the terminal, and the first protrusion is at least partially located on the side of the first connecting portion of another terminal away from the first wall. This can limit the other first connecting portion. When the first connecting portion has a large dimension along the first direction, it can prevent the end away from the second connecting portion from tilting up. The two terminals limit each other, which can improve the reliability and firmness of the terminal installation.

[0055] In some embodiments, the first protrusion is configured to press against one end of the first connecting portion away from the second connecting portion in a first direction.

[0056] In this embodiment, the first protrusion presses down on the end of the first connecting part that is away from the second connecting part along the first direction, which can directly limit the free end of the first connecting part, improve the limiting effect, and prevent the end of the first connecting part that is away from the second connecting part along the first direction from lifting up.

[0057] In some embodiments, the first protrusion is located in the region where the inner end of the second connecting portion is not connected to the first connecting portion along the first direction, and the end of the first connecting portion away from the second connecting portion along the first direction is provided with the second protrusion. The first protrusion and the second protrusion limit each other in the thickness direction of the first wall.

[0058] This embodiment provides a first protrusion on the second connecting portion of one terminal and a second protrusion on the first connecting portion of the other terminal, thereby enabling the two terminals to mutually limit each other in the thickness direction of the first wall. The first protrusion is located on the side away from the first wall relative to the second protrusion to prevent the free end of the first connecting portion from warping up along the first direction.

[0059] In some embodiments, the first protrusion and the second protrusion have a gap along the thickness direction of the first wall, the outer wall of the first protrusion along the first direction has a gap with the side wall of the first connection portion of the other terminal, the outer wall of the second protrusion along the first direction has a gap with the side wall of the second connection portion of the other terminal, the two terminals have opposite polarities, and the terminal assembly further includes a first insulating member, at least a portion of which is disposed in the gap.

[0060] This embodiment, by placing a portion of the first insulating member within the gap formed by the first protrusion and the second protrusion, not only allows the first protrusion to press against the second protrusion through the portion of the first insulating member located within the gap, but also provides insulation to the two terminals, thereby improving insulation reliability.

[0061] In some embodiments, at least two terminals are spaced apart along a first direction, which is the length direction of the first wall.

[0062] The terminal assembly of this embodiment arranges at least two terminals side by side along the first direction, which can make full use of the large space of the first wall along the first direction, with enough space to arrange at least two terminals, and is conducive to designing the terminals to be larger in size, especially increasing the size of the terminals along the second direction, which facilitates increasing the connection area between the tabs and the busbars and the terminals, improving the connection strength and the current carrying capacity.

[0063] In some embodiments, the terminal assembly is disposed in the middle region of the first wall along a first direction.

[0064] In this embodiment, the terminal assembly is located in the middle region of the first wall along the first direction, and the opening on the first wall is also located in the middle region. This results in a more balanced distribution of structural strength on both sides of the first wall along the first direction, and the internal tabs are also close to the terminals when connected, facilitating connection. For example, when using adapters for connection, adapters of similar size can also be used. Furthermore, when multiple battery cells are grouped together, if it is necessary to press the first wall with pressure strips, there is sufficient space on both sides of the terminal assembly to install pressure strips, which also helps to increase the width of the pressure strips.

[0065] In some embodiments, the terminal has a circular or rectangular cross-section.

[0066] This embodiment designs the terminal with a circular cross-section, which optimizes manufacturing performance, enhances the terminal's strength, reduces localized stress, decreases terminal weight, lowers costs, facilitates welding, and improves the efficiency of battery cell assembly. Alternatively, the terminal can be designed with a rectangular cross-section, facilitating layout design according to the size of the electrode assembly, providing a larger welding area for the busbar, and improving connection strength and current carrying capacity. Optionally, the terminal can also combine the advantages of these two terminal shapes, or be designed with an irregular structure.

[0067] In some embodiments, the battery cell further includes an electrode assembly and an adapter disposed within the housing. The electrode assembly includes an electrode body and a tab, with the tab extending from the electrode body and electrically connected to a corresponding terminal via an adapter.

[0068] The electrical connection area of ​​the electrode and the adapter is offset from the electrical connection area of ​​the terminal and the adapter along a first direction, which is the length direction of the first wall.

[0069] This embodiment, by providing an adapter, can simultaneously adapt to the positions of the tabs and corresponding terminals, facilitating the electrical connection between the tabs and terminals; moreover, the electrical connection areas of the tabs and adapter are offset from the electrical connection areas of the terminals and adapter along a first direction, ensuring that both the tabs and terminals are reliably connected to the adapter.

[0070] In some embodiments, the adapter is flat.

[0071] In this embodiment, the adapter is designed as a flat plate, which is simple to process and can be fully abutted against the second insulating member provided on the inner side of the first wall, making the installation of the adapter more stable.

[0072] In some embodiments, the terminal assembly is located on the first wall at a position offset from the middle region along a first direction, and the battery cell further includes a pressure relief component configured to relieve pressure when the pressure in the battery cell exceeds a preset threshold. The pressure relief component is located on the first wall, and the first direction is the length direction of the first wall.

[0073] Since the terminal assembly is located on the first wall at a position offset from the middle region along the first direction, sufficient space can be left in the middle region of the first wall to install the pressure relief component. In the event of thermal runaway of the battery cell, the internal high-pressure gas can be discharged through the central hole of the electrode assembly and discharged in time through the pressure relief component, thereby improving the reliability and safety of the battery cell operation.

[0074] In some embodiments, the terminal assembly is disposed in the middle region of the first wall along a first direction, and the battery cell further includes a pressure relief component configured to relieve pressure when the pressure inside the battery cell exceeds a preset threshold. The pressure relief component is disposed on the wall opposite to or adjacent to the first wall of the housing, and the first direction is the length direction of the first wall.

[0075] In this embodiment, the terminal assembly is located in the middle region of the first wall along the first direction, occupying the space of the middle region. Since it is impossible to install a pressure relief component in this region, placing the pressure relief component on the wall opposite to or adjacent to the first wall can keep the pressure relief component away from the terminal assembly. When the battery cell experiences thermal runaway, the high-temperature and high-pressure gas discharged through the pressure relief component will be kept as far away from the terminal assembly as possible, reducing the risk of short circuit and improving the safety of the battery cell operation.

[0076] According to a second aspect of this application, a battery is provided, comprising the battery cell of the above embodiments.

[0077] In some embodiments, the battery includes a battery module, which includes a busbar and a plurality of battery cells arranged side by side along a second direction. The battery cells have two terminals, including a first terminal and a second terminal. A first end of the busbar is electrically connected to the first terminal of one of the battery cells, and a second end of the busbar is electrically connected to the second terminal of another battery cell.

[0078] In this embodiment, the battery cell integrates the first terminal and the second terminal. When the battery module is formed by connecting the components, the electrical connection can be achieved by welding, which can reduce the movement range of the welding equipment. All components can be connected within a small range along the first direction of the first wall, thereby improving the production efficiency of the battery.

[0079] In some embodiments, the main body portions of both terminals each include a first connecting portion, and the first connecting portions of each of the two terminals are arranged along a second direction;

[0080] In this battery module, multiple battery cells have the same terminal configuration. The busbar extends along the second direction, and the first end of the busbar is electrically connected to the first connection part of one of the battery cells, while the second end of the busbar is electrically connected to the first connection part of another battery cell.

[0081] In this embodiment, the main body of the terminal includes a first connecting portion, and two first connecting portions are arranged along a second direction. When battery cells are assembled, it is not necessary to misalign multiple busbars, which facilitates connection operations. For example, during welding, it is not necessary to repeatedly adjust the position of the welding tool along the first direction, thereby improving battery production efficiency. Moreover, since the first connecting portions of the two terminals in the terminal assembly jointly occupy the space of the first wall along the second direction, the length of the busbar can be shortened when connecting two adjacent first connecting portions through the busbar, reducing material consumption. In addition, each first connecting portion extends along the first direction and can be designed with a suitable extension length to meet the width requirements of the busbar, thereby achieving a larger current carrying capacity. Furthermore, multiple battery cells in the same battery module have the same terminal arrangement, eliminating the need to set different battery cells and reducing assembly difficulty.

[0082] In some embodiments, two terminals are spaced apart along a first direction, and the terminal assembly is located in the middle region of the first wall along the first direction, the first direction being perpendicular to the second direction;

[0083] In this battery module, multiple battery cells have the same terminal arrangement. In adjacent battery cells, the first terminal of one battery cell and the second terminal of another battery cell are arranged along a second direction.

[0084] In this embodiment, since two terminals with opposite polarities are spaced apart along the first direction, in order to achieve the series connection of multiple battery cells, the first terminal of one battery cell in an adjacent battery cell needs to be directly opposite the second terminal of another battery cell. Therefore, the terminal arrangement of adjacent battery cells is different. By setting the terminal assembly along the first direction in the middle area of ​​the first wall, battery cells with the same terminal arrangement can be used when forming the battery module. It is only necessary to rotate the spaced battery cells by 180°. Different battery cells do not need to be set in the same battery module, which can reduce the assembly difficulty.

[0085] According to a third aspect of this application, an electrical device is provided, including a battery cell or battery as described above, wherein the battery cell or battery is used to provide electrical energy to the electrical device. Attached Figure Description

[0086] 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 the drawings without creative effort.

[0087] Figure 1 This is a schematic diagram of the structure of some embodiments of a battery cell in related technologies.

[0088] Figure 2 This is a schematic diagram of the structure of some embodiments of batteries in related technologies.

[0089] Figure 3 This is a schematic diagram of some embodiments of the battery installation in a vehicle according to this application.

[0090] Figure 4 The diagram shows the structure of some embodiments of the battery in this application.

[0091] Figure 5 This is a schematic diagram of the structure of some embodiments of the battery module in the battery of this application.

[0092] Figure 6 This is a schematic diagram of the structure of some embodiments of the battery cell of this application.

[0093] Figure 7 The diagram shows the structure of some other embodiments of the battery cell of this application.

[0094] Figure 8 for Figure 7 The top view of the battery cell shown.

[0095] Figure 9 for Figure 8 AA section view in the image.

[0096] Figure 10 for Figure 9 Enlarged view of point K in the image.

[0097] Figure 11 for Figure 9 BB section view in the middle.

[0098] Figure 12 This is an exploded view of some embodiments of the end cap assembly.

[0099] Figure 13 This is a schematic diagram of the structure of the first embodiment of the terminal assembly of this application.

[0100] Figure 14 for Figure 13 An exploded view of the terminal assembly shown.

[0101] Figure 15 for Figure 13 Top view of the terminal assembly shown.

[0102] Figure 16 for Figure 15 CC section view in the image.

[0103] Figure 17 for Figure 15 DD section view in the image.

[0104] Figure 18 for Figure 15 A schematic diagram of a modified example of the terminal assembly shown.

[0105] Figure 19 for Figure 15 A schematic diagram of another variation of the terminal assembly shown.

[0106] Figure 20 This is a schematic diagram of the structure of a second embodiment of the terminal assembly of this application.

[0107] Figure 21 for Figure 20 Exploded views of some embodiments of the terminal assembly shown.

[0108] The accompanying drawings are not drawn to scale.

[0109] Marker explanation:

[0110] 100. Battery cell; 10. Casing;

[0111] 1. Housing; 11. Pressure relief components;

[0112] 2. End cap; 20. Injection hole; 21. Groove; 22. Through hole; 23. Flanged edge; 24. Weld;

[0113] 3. Terminal assembly; 30. Terminal; 301. Main body; 302. Protrusion; 303. First connecting part; 304. Second connecting part; 305. First protrusion; 306. Second protrusion; 31. Connector; 311. Base; 312. Limiting part; 313. Connecting part; 314. Transition part; 315. Opening; 32. First insulating member; 321. Annular part; 322. Intermediate plate; 323. Mounting hole; 324. Isolation part; 3241. First partition; 3242. Second partition; 33. First terminal; 331. First part; 332. Second part; 34. Second terminal;

[0114] 4. Electrode assembly; 41. Electrode body; 42. First electrode tab; 43. Second electrode tab; x, first direction; y, second direction; z, third direction;

[0115] 5. Second insulating component; 51. Main body plate; 52. Thickened portion; 53. Recessed portion; 54. Extension portion;

[0116] 6. Adapter; 61. First adapter; 62. Second adapter;

[0117] 7. Seals;

[0118] 200, Battery; 200', Battery Module; 201, Housing Assembly; 201A, Housing Section; 201B, Cover Section; 202, Busbar;

[0119] 300. Vehicle; 301. Cabin; 302. Floor. Detailed Implementation

[0120] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of this application by way of example, but should not be used to limit the scope of this application, that is, this application is not limited to the described embodiments.

[0121] 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).

[0122] This application uses terms such as "upper," "lower," "top," "bottom," "front," "back," "inner," and "outer" to indicate orientation or positional relationships. This is only for the convenience of describing this application and is not intended to indicate or imply that the device referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the scope of protection of this application.

[0123] Furthermore, the terms "first," "second," and "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. "Vertical" does not mean strictly vertical, but rather within the permissible range of error. "Parallel" does not mean strictly parallel, but rather within the permissible range of error. The directional terms appearing in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of this application.

[0124] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application depending on the specific circumstances.

[0125] 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 some of the embodiments 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.

[0126] Battery cells may include lithium-ion rechargeable batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and this application embodiment is not limited to these. Battery cells may be cylindrical, flat, cuboid, or other shapes, etc., and this application embodiment is not limited to these. Battery cells are generally classified into three types according to their packaging method: cylindrical battery cells, square battery cells, and pouch battery cells, and this application embodiment is not limited to these.

[0127] Current battery cells typically consist of a casing and an electrode assembly housed within the casing, with an electrolyte filled inside. The electrode assembly is mainly formed by stacking or winding a first electrode and a second electrode with opposite polarities, and a separator is usually provided between the first and second electrodes. The portions of the first and second electrodes coated with active material constitute the main body of the electrode assembly, while the portions of the first and second electrodes not coated with active material constitute the first tab and the second tab, respectively. In lithium-ion batteries, the first electrode can be a positive electrode, including a positive current collector and a positive electrode coating layer disposed on both sides of the positive current collector. The material of the positive current collector can be, for example, aluminum, and the positive electrode coating layer can be, for example, lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide; the second electrode can be a negative electrode, including a negative current collector and a negative electrode coating layer disposed on both sides of the negative current collector. The material of the negative current collector can be, for example, copper, and the negative electrode coating layer can be, for example, graphite or silicon. The first tab and the second tab can be located together at one end of the main body or at opposite ends of the main body. During the charging and discharging process of a single battery cell, the positive electrode coating and the negative electrode coating react with the electrolyte, and the tabs connect to the electrode leads to form a current loop.

[0128] A pressure relief component is an element or part that is activated when the internal pressure or temperature of a battery cell reaches a predetermined threshold to release the internal pressure or temperature. This threshold design varies depending on design requirements. The threshold may depend on one or more materials of the positive electrode, negative electrode, electrolyte, and separator in the battery cell. Pressure relief components can take the form of explosion-proof valves, gas valves, pressure relief valves, or safety valves, and can specifically employ pressure-sensitive or temperature-sensitive elements or structures. That is, when the internal pressure or temperature of the battery cell reaches the predetermined threshold, the pressure relief component actuates or a weak structure within the pressure relief component is damaged, thereby creating an opening or channel for the release of internal pressure or temperature.

[0129] The term "actuation" as used in this application refers to the activation or actuation of the pressure relief component to a certain state, thereby releasing the internal pressure and temperature of the battery cell. The action of the pressure relief component may include, but is not limited to, at least a portion of the pressure relief component rupturing, breaking, tearing, or opening, etc. When the pressure relief component is actuated, internal waste from the battery cell is discharged from the actuated portion. This method enables pressure and temperature relief of the battery cell under controllable pressure or temperature, thereby preventing potentially more serious accidents.

[0130] The emissions from individual battery cells mentioned here include, but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, fragments of the separator, high-temperature and high-pressure gases generated by the reaction (such as CH4, CO and other combustible gases), flames, etc.

[0131] Figure 1This is the structure commonly used in current battery cells 100a. The casing 1a has an opening, and an end cap 2a is used to close the opening. Positive terminals 31a and negative terminals 32a are spaced apart on the end cap 2a along a first direction x (the length direction of the battery cell 100a). Figure 2 As shown, when multiple battery cells 100a are arranged side by side along the second direction y (the width direction of the battery cell 100a) to form a battery module, the positive terminal 31a and negative terminal 32a of adjacent battery cells 100a are connected in series by the busbar 4a.

[0132] The assembly efficiency of this type of battery cell is low, mainly because each terminal is installed independently, requiring each terminal to be connected to the end cover body and have insulating components installed. To address these shortcomings, this application aims to improve the assembly efficiency of the battery cell by reducing the difficulty of terminal installation.

[0133] Based on this improvement approach, this application provides an improved battery cell. The battery cell includes: a casing, including a first wall; and a terminal assembly, including a connector and two terminals, both terminals being disposed on the first wall, the connector at least partially surrounding the two terminals, the terminals being at least partially disposed between the connector and the first wall along the thickness direction of the first wall, and the connector being connected to the first wall.

[0134] The battery cells in this application are applicable to batteries and electrical devices that use batteries.

[0135] Electrical devices can include mobile phones, portable devices, laptops, electric vehicles, electric cars, ships, spacecraft, electric toys, and power tools, etc. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include 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.

[0136] like Figure 3 As shown, the electrical device can be a vehicle 300, such as a new energy vehicle, which can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle; or the electrical device can be a drone or a ship. The vehicle 300 may include a cabin 301 and a vehicle floor 302, with the battery 200 located between the cabin 301 and the vehicle floor 302. The battery 200 can be located at the bottom, front, or rear of the vehicle 300, and is used to provide electrical power for the motor and other components in the vehicle.

[0137] like Figure 4As shown, battery 200 includes battery cells 100. Battery 200 can contain one or more battery cells 100. If there are multiple battery cells 100, they can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 100 can be connected in both series and parallel connections. This can be achieved by first connecting multiple battery cells 100 in series, parallel, or in a mixed configuration to form a battery module, and then connecting multiple battery modules in series, parallel, or in a mixed configuration to form a whole, which is then housed within the housing assembly 201. Alternatively, all battery cells 100 can be directly connected in series, parallel, or in a mixed configuration, and then the whole assembly of all battery cells 100 is housed within the housing assembly 201.

[0138] Figure 4 The battery 200 also includes a housing assembly 201, which is hollow inside and used to accommodate one or more battery cells 100. The housing assembly 201 may also have different shapes and sizes depending on the shape, number, arrangement, and other requirements of the battery cells 100 it accommodates. For example, the housing assembly 201 may include a housing portion 201A and a cover portion 201B. The end of the housing portion 201 has an opening, and the cover portion 201B is used to close the opening of the housing portion 201A. For example, depending on the arrangement of the multiple battery cells 100, the housing portion 201A may have a rectangular cylindrical structure. To facilitate maintenance of the battery 200, the housing assembly 201 is detachably installed on the electrical device.

[0139] Optionally, the structural components of the electrical device form a space for accommodating the battery cell 100, which functions as the housing assembly 201 in the battery 200. For example, when the battery cell 100 is used in a vehicle 300, the vehicle frame forms a space for accommodating the battery cell 100.

[0140] The battery cell 100 can be, for example, a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium-lithium-ion battery, or a magnesium-ion battery, etc.

[0141] This application provides a battery cell 100, and subsequent embodiments will be described using a cuboid battery cell 100 as an example.

[0142] In some embodiments, such as Figure 6 and Figure 7 As shown, the battery cell 100 of this application includes:

[0143] The outer casing 10 includes a first wall;

[0144] Electrode assembly 4, disposed within housing 10, includes electrode body 41 and electrode tabs, the electrode tabs extending from electrode body 41; and

[0145] Terminal assembly 3 includes connector 31 and at least two terminals 30. The at least two terminals 30 are disposed on the first wall. Connector 31 is disposed at least partially around the at least two terminals 30. Terminals 30 are disposed at least partially between connector 31 and the first wall along the thickness direction of the first wall. Connector 31 is connected to the first wall. Terminals 30 are electrically connected to corresponding tabs.

[0146] The outer casing 10 may be a thin-walled hollow structure used to house the electrode assembly. The outer casing 10 may be cylindrical, flat, cuboid, or other shapes. It includes a housing 1 and an end cap 2. The housing 1 has an opening, and the end cap 2 closes the opening. The first wall can be any side wall of the outer casing 10; for example, the first wall may be the end cap 2, or a side wall adjacent to or opposite to the end cap 2. The terminal assembly 3 is integrally disposed on the first wall. The outer casing 10 is generally made of metal, and correspondingly, the connector 31 can also be made of metal, which improves both the connection strength between the connector 31 and the first wall and the reliability of the terminal 30 installation.

[0147] For the same terminal assembly 3, the connector 31 at least partially surrounds all the terminals 30 in the terminal assembly 3. For example, the connector 31 may be in a continuous ring structure or in an intermittently distributed structure. When the connector 31 is intermittently arranged, at least two terminals 30 are located within the area enclosed by the portions of the connector 31. The terminals 30 are at least partially disposed between the connector 31 and the first wall along the thickness direction of the first wall.

[0148] Terminal 30 serves as an electrode lead-out section for inputting or outputting electrical energy. The terminal can be designed as a pole post, which can be cylindrical, square, or other irregularly shaped. Terminal 30 is insulated from the housing 10.

[0149] Optionally, such as Figure 5 As shown, at least a portion of the terminal 30 protrudes from the outer wall surface of the first wall to facilitate electrical connection between different battery cells 100 via the busbar 202.

[0150] For example, there are only two terminals 30, and the polarities of the two terminals 30 are opposite, namely the positive terminal and the negative terminal, and the connector 31 and the two terminals 30 form the terminal assembly 3.

[0151] For example, at least two terminals 30 are provided, wherein the first part of the terminals 30 (at least two) are of the same polarity, such as positive terminals, that is, the first part of the terminals 30 with the same polarity and the connector 31 form a terminal assembly 3, and the second part of the terminals 30 are of the same polarity and opposite to the polarity of the first part of the terminals 30, such as negative terminals, that is, the second part of the terminals 30 with the same polarity and the connector 31 form another terminal assembly 3.

[0152] In this embodiment, the battery cell 100 integrates at least two terminals 30 and a connector 31 into a terminal assembly 3, such that at least two terminals 30 are located within the area enclosed by the same connector 31. During assembly, it can be installed as a single component on the first wall, reducing the number of parts related to terminal 30 installation and simplifying the production and assembly process of the terminal 30, thereby improving production efficiency and reducing costs. The connector 31 is connected to the first wall, and the terminals 30 are at least partially disposed between the connector 31 and the first wall along the thickness direction of the first wall. The connector 31 can limit the position of the terminals 30 along the thickness direction of the first wall.

[0153] Moreover, this structure can reduce the number of openings on the first wall and improve the strength of the first wall where the terminal 30 is installed.

[0154] Furthermore, when multiple battery cells 100 are grouped together to form a battery module 200', conventional battery cells 100a have two terminals respectively located in the area near both ends of the end cover 2a along the first direction x. When the end cover 2a is pressed down from the outer area of ​​the terminals by the pressure strip, the space is limited, and only a small width of the pressure strip is allowed, resulting in a poor pressing effect. However, the solution of this application is to set up an integrated terminal assembly 3, which can reduce the space occupied on the first wall, allow the use of a wider pressure strip, and optimize the pressing effect.

[0155] In some embodiments, the connector 31 is a closed ring structure that surrounds at least two terminals 30.

[0156] For example, such as Figure 14 As shown, the connector 31 can be oblong, which is advantageous for providing at least two terminals 30 within the oblong area. The connector 31 can extend continuously in the circumferential direction.

[0157] In this embodiment, the connector 31 is designed as a closed ring structure, which can improve its own structural strength, eliminate the need to rely on other structures in the terminal assembly 3 to hold the connector 31 as an integral structure, and improve the reliability of the connection between the connector 31 and the first wall, thereby better holding the terminal 30 in position through the connector 31.

[0158] In some embodiments, such as Figures 12 to 14 As shown, at least two terminals 30 have opposite polarities, and the terminal assembly 3 also includes a first insulating member 32, which is at least partially disposed between the terminals 30 with opposite polarities.

[0159] For example, two terminals 30 are provided, the two terminals 30 have opposite polarities, and the first insulating member 32 is at least partially disposed between the two terminals 30.

[0160] In this embodiment, the terminal assembly 3 provides a first insulating member 32 between terminals 30 with opposite polarities to maintain insulation between the terminals 30 with opposite polarities, thereby improving insulation performance and ensuring the reliability of the battery cell 100 operation.

[0161] In some embodiments, such as Figure 14 As shown, the first insulating member 32 is at least partially disposed between the terminal 30 and the first wall, and / or the first insulating member 32 is at least partially disposed between the terminal 30 and the connector 31.

[0162] This embodiment enables the first insulating member 32 to be at least partially disposed between the terminal 30 and the first wall when the connector 31 is made of metal, thereby maintaining insulation between the terminal 30 and the first wall. Similarly, by partially disposing the first insulating member 32 between the terminal 30 and the connector 31, insulation between the terminal 30 and the connector 31 can be maintained. Thus, insulation between multiple conductive components can be achieved through the first insulating member 32, improving insulation reliability and ensuring the reliable operation of the battery cell 100.

[0163] In some embodiments, such as Figure 14 As shown, terminal 30 includes a main body 301 and a protrusion 302. The protrusion 302 is disposed on the side wall of the main body 301 and extends circumferentially along at least a portion of terminal 30. Connector 31 includes:

[0164] Base 311, connected to the first wall; and

[0165] The limiting part 312 is connected to the base 311 and is at least partially disposed on the side of the protrusion 302 away from the first wall.

[0166] In the same cross-section of the connector 31, the outer dimension of the base 311 is larger than the outer dimension of the limiting part 312.

[0167] For example, both the base 311 and the limiting part 312 can be flat, annular, closed structures.

[0168] In this embodiment, a protrusion 302 is provided on the side wall of the main body 301 of the terminal 30. When the connector 31 is fixed to the first wall by the base 311, the protrusion 302 can be limited by the limiting part 312 to restrict the degree of freedom of the terminal 30 to move outward along the thickness direction of the first wall, so as to reliably install the terminal 30 on the first wall.

[0169] In some embodiments, such as Figure 14 As shown, the connector 31 also includes a connecting portion 313, which is connected between the base 311 and the limiting portion 312 and is disposed opposite to the side wall of the protrusion 302.

[0170] For example, the connecting portion 313 may extend along the thickness direction of the first wall. A plurality of openings 315 may be provided circumferentially on the connecting portion 313. When the first insulating member 32 is formed by injection molding, the injection molding material can be embedded in the openings 315 to increase the connection strength between the first insulating member 32 and the connecting member 31.

[0171] In this embodiment, the connector 31 can connect the base 311 and the limiting part 312 by providing a connecting part 313. The connecting part 313 is disposed opposite to the side wall of the protrusion 302, so that the limiting part 312 can extend to the side of the protrusion 302 away from the first wall, thereby limiting the protrusion 302 by the limiting part 312.

[0172] In some embodiments, the connector 31 further includes a transition portion 314 connected between the limiting portion 312 and the connecting portion 313.

[0173] For example, the transition portion 314 can be an arc-shaped structure, or a structure that is inclined relative to the limiting portion 312.

[0174] This embodiment, by providing a transition portion 314 between the limiting portion 312 and the connecting portion 313, can prevent stress concentration at the connection position of the limiting portion 312 and the connecting portion 313, optimize the stress condition of the connector 31, and more reliably install the terminal 30 onto the first wall.

[0175] In some embodiments, such as Figure 12 As shown, a groove 21 is provided on the first wall, and the base 311 is at least partially accommodated in the groove 21.

[0176] The groove 21 has the same shape as the base 311. The base 311 can be completely accommodated in the groove 21. The base 311 is flush with the outer surface of the first wall, or the outer surface of the base 311 can protrude from or be recessed into the outer surface of the first wall.

[0177] In this embodiment, the base 311 is accommodated in the groove 21, which can minimize the protrusion height of the terminal assembly 3 relative to the first wall, facilitate the connection between the base 311 and the first wall, and improve the connection strength between the base 311 and the first wall.

[0178] In some embodiments, such as Figure 19 As shown, the mating surfaces of the base 311 and the groove 21 are connected by a weld 24.

[0179] For example, the base 311 is flush with the outer surface of the first wall, which facilitates welding at the mating side wall of the base 311 and the groove 21.

[0180] This embodiment can easily connect the connector 31 to the first wall by welding the mating surfaces of the base 311 and the groove 21. The process is simple, and the groove 21 can be directly opened on the first wall, which can reduce the processing difficulty of the first wall. In addition, the connection by welding is less likely to cause deformation of the first wall.

[0181] In some embodiments, such as Figure 17 and Figure 18 As shown, the first wall has a flange 23 at the edge of the groove 21, and the flange 23 is at least partially located on the side of the base 311 away from the bottom surface of the groove 21.

[0182] The first wall has a flange 23 perpendicular to the surface of the first wall at the edge of the groove 21. After the base 311 is inserted into the groove 21, an external force can be applied to deform and flip the flange 23 to the side of the base 311 away from the bottom surface of the groove 21, so as to limit the base 311. For example, the flange 23 can be deformed to limit the base 311 by riveting.

[0183] like Figure 15 As shown, the continuous extension of the flange 23 increases the pressing force of the flange 23 on the base 311. Figure 18 As shown, multiple flanges 23 are intermittently set. In particular, the intermittent setting of flanges 23 in the arc area makes it easier to bend the flanges 23.

[0184] In this embodiment, by setting a flange 23 at the edge of the groove 21 to limit and fix the base 311, the connection between the base 311 and the first wall can be realized. The flange 23 can reliably limit the base 311, thereby improving the reliability of the connection between the connector 21 and the first wall.

[0185] In some embodiments, such as Figure 14 As shown, the first insulating member 32 includes an annular portion 321 that surrounds at least two terminals 30 and covers at least a portion of the outer side of the connector 31.

[0186] The annular portion 321 matches the shape of the connector 31, for example, as Figure 13 As shown, the annular portion 321 covers the area of ​​the connector 31 excluding the base 311.

[0187] In this embodiment, the first insulating member 32, by providing an annular portion 321, can form insulating protection on the outer side of the connector 31 in the circumferential direction, and form insulating protection on the portion of the terminal 30 that is higher than the protrusion 302, thereby ensuring the insulation performance of the terminal assembly 3.

[0188] In some embodiments, such as Figures 9 to 11As shown, the battery cell 100 also includes an electrode assembly 4 disposed inside the housing 10. The electrode assembly 4 includes an electrode body 41 and a tab, with the tab extending out from the electrode body 41.

[0189] The first insulating member 32 also includes an intermediate plate 322, which is connected to the annular portion 321. The intermediate plate 322 is provided with two mounting holes 323 at intervals along a first direction x, where the first direction x is the length direction of the first wall. At least a portion of the terminal 30 passes through the mounting hole 323 and is electrically connected to the corresponding tab. The terminal 30 protrudes from the annular portion 321.

[0190] The electrode assembly 4 is formed by stacking or winding first and second electrodes with opposite polarities, and typically a diaphragm is provided between the first and second electrodes. The portions of the first and second electrodes coated with active material constitute the electrode body 41, while the portions of the first and second electrodes not coated with active material constitute the first tab and the second tab, respectively. The tab can be led out from the side of the electrode body 41 facing the first wall to facilitate connection between the tab and the terminal 30. Optionally, the tab can also be led out from the side of the electrode body 41 adjacent to the first wall.

[0191] The first insulating member 32 includes an annular portion 321 and an intermediate plate 322, the intermediate plate 322 being connected within the annular portion 321, and the thickness of the intermediate plate 322 being less than that of the annular portion 321. For example, the two terminals 30 of the terminal assembly 3 include two first terminals 33 and second terminals 34 with opposite polarities, the first terminals 33 and the second terminals 34 being respectively installed in two mounting holes 323 and electrically connected to the first tab and the second tab respectively.

[0192] In this embodiment, the first insulating member 32, by providing an intermediate plate 322 within the annular portion 321, can both insulate and protect the connector 31 and support the mounting terminal 30, thereby improving the overall strength of the first insulating member 32. Moreover, since the terminal 30 protrudes from the annular portion 321, it can be conveniently electrically connected to the terminals 30 of adjacent battery cells 100 via the busbar 202 when assembled.

[0193] In some embodiments, such as Figure 13 and Figure 14 As shown, at least two terminals 30 each include a main body 301, the main body 301 including: a first connecting part 303 configured to be electrically connected to other battery cells 100; wherein, the two first connecting parts 303 are arranged along a second direction y, the second direction y being the width direction of the first wall.

[0194] The first connection portion 303 can extend along the first direction x, and the first connection portion 303 is electrically connected to the first connection portion 303 of the terminal 30 of other battery cells 100 through the busbar 202.

[0195] For example, such as Figure 13 As shown, the two first connecting portions 303 are arranged along the second direction y, and more preferably, the two first connecting portions 303 are arranged facing each other along the second direction y. Figure 5 As shown, multiple battery cells 100 are arranged side by side along the second direction y. A busbar 202 is connected to an adjacent first connection portion 303, for example, by welding. After connection, all busbars 202 are located in the same straight line. For example, the first end of the busbar 202 is connected to the first connection portion 303 of the first terminal 33 of a battery cell 100, and the second end of the busbar 202 is connected to the first connection portion 303 of the second terminal 34 of an adjacent battery cell 100.

[0196] In this embodiment, the main body 301 of the terminal 30 includes a first connecting portion 303, and two first connecting portions 303 are arranged along the second direction y. When the battery cells 100 are assembled, it is not necessary to misalign multiple busbars 202, which facilitates connection operations. For example, during welding, it is not necessary to repeatedly adjust the position of the welding tool along the first direction x, thereby improving the assembly efficiency of the battery cells 100. Moreover, since the first connecting portions 303 of the two terminals 30 in the terminal assembly 3 jointly occupy the space of the first wall along the second direction y, the length of the busbar 202 can be shortened when connecting two adjacent first connecting portions 303 through the busbar 202, reducing material consumption. In addition, each first connecting portion 303 extends along the first direction x, and can be designed with a suitable extension length according to requirements to meet the width requirements of the busbar 202, thereby achieving a larger current carrying capacity.

[0197] In some embodiments, such as Figure 14 As shown, the battery cell 100 also includes an electrode assembly 4 disposed within the housing 10. The electrode assembly 4 includes an electrode body 41 and a tab. The tab extends from the electrode body 41. The body portion 301 also includes a second connection portion 304 configured to be electrically connected to the corresponding tab. The second connection portion 304 is connected to the first connection portion 303. The second connection portions 304 of each of the two terminals 30 are arranged along a first direction x, which is perpendicular to the second direction y.

[0198] For example, such as Figure 13 As shown, the two second connecting portions 304 are arranged along the first direction x, and more preferably, the two second connecting portions 304 are directly opposite each other along the first direction x. The first connecting portion 303 may be located near one side of the second connecting portion 304 along the second direction y to form an L-shaped structure; or the first connecting portion 303 may be located in the middle region of the second connecting portion 304 along the second direction y to form a T-shaped structure. The second connecting portion 304 at least partially passes through the mounting hole 323 and is electrically connected to the electrode tab.

[0199] For example, the second connecting part 304 can be rectangular, circular, or a combination of rectangular and circular shapes to facilitate the installation of the first connecting part 303.

[0200] In this embodiment, the main body 301 of the terminal 30 includes a first connecting portion 303 and a second connecting portion 304. The first connecting portion 303 is used for electrical connection with other battery cells 100, and the second connecting portion 304 is used for electrical connection with the tab. This makes the areas of the terminal 30 used for connection with the tab and other battery cells 100 independent of each other, which can improve the reliability of electrical connection. For example, when electrical connection is achieved by welding, it can prevent the two welding areas from affecting each other. Moreover, this structure is beneficial to increase the area of ​​electrical connection between the terminal 30 and the tab, and also to increase the area of ​​electrical connection between the terminal 30 and the busbar 202.

[0201] In some embodiments, such as Figure 13 and Figure 14 As shown, there are two terminals 30 with opposite polarities. The terminal assembly 3 also includes a first insulating member 32, which includes an isolation portion 324. The isolation portion 324 includes:

[0202] Two first partitions 3241 extend along the second direction y and are disposed between the first connecting portion 303 of one terminal 30 and the second connecting portion 304 of the other terminal 30; and

[0203] The second partition 3242 extends along the first direction x and is disposed between the first connecting portions 303 of the two terminals 30, and the two ends of the second partition 3242 are respectively connected to the ends of the two first partitions 3241.

[0204] The isolation section 324 can be disposed on the intermediate plate 322 and can form a Z-shaped structure. The continuous extension of the isolation section 324 can improve the insulation reliability.

[0205] In this embodiment, the first insulating member 32 has an isolation portion 324 between two terminals 30 with opposite polarities, which can completely insulate and separate the two terminals 30 with opposite polarities, thereby improving insulation performance and thus improving insulation reliability.

[0206] In some embodiments, such as Figure 13 As shown, the top surface of the isolation portion 324 is further away from the first wall than the outer surface of the terminal 30, that is, the top surface of the isolation portion 324 is higher than the outer surface of the terminal 30 by a predetermined distance. Optionally, the top surface of the isolation portion 324 can be flush with the outer surface of the terminal 30, which can also achieve reliable insulation between the two terminals 30.

[0207] This embodiment makes the top surface of the isolation portion 324 higher than the outer surface of the terminal 30, which can increase the creepage distance between the two terminals 30, thereby improving the insulation performance between the two terminals 30. Furthermore, after multiple battery cells 100 are grouped together, the terminals 30 of adjacent battery cells 100 are electrically connected through the busbar 202. The isolation portion 324 can increase the creepage distance between adjacent busbars 202, thereby improving the insulation performance between adjacent busbars 202.

[0208] In some embodiments, the two terminals 30 have opposite polarities, and the terminal assembly 3 further includes a first insulating member 32. The first insulating member 32 includes an annular portion 321 and an intermediate plate 322. The annular portion 321 surrounds the two terminals 30 and covers at least part of the outer side of the connector 31. The intermediate plate 322 is connected to the inner wall of the annular portion 321 near the first wall along the thickness direction of the first wall. The intermediate plate 322 is provided with two mounting holes 323 spaced apart along the first direction x. The second connecting portion 304 passes through the mounting holes 323. The first connecting portion 303 is located on the side of the intermediate plate 322 away from the first wall.

[0209] In this embodiment, the intermediate plate 322 is connected to the inner wall of the annular portion 321 near the first wall. On the one hand, this allows the terminal 30 to be located closer to the first wall, reducing the protrusion height of the terminal 30 relative to the first wall and thus reducing the space occupied. On the other hand, it provides a space for the first connecting portion 303, reducing the height of the first connecting portion 303 protruding from the annular portion 321.

[0210] In some embodiments, such as Figure 14 As shown, in the terminal assembly 3, one of the terminals 30 is provided with a first protrusion 305. Along the thickness direction of the first wall, the first protrusion 305 is at least partially disposed on the side of the first connecting portion 303 of the other terminal 30 away from the first wall.

[0211] This embodiment provides a first protrusion 305 on the terminal 30, and the first protrusion 305 is at least partially disposed on the side of the first connecting portion 303 of the other terminal 30 away from the first wall. This can limit the other first connecting portion 303. When the first connecting portion 303 has a large dimension along the first direction x, it can prevent the end away from the second connecting portion 304 from tilting up. The two terminals 30 limit each other, which can improve the reliability and firmness of the terminal 30 installation.

[0212] In some embodiments, the first protrusion 305 is configured to press against one end of the first connecting portion 303 away from the second connecting portion 304 along a first direction x.

[0213] In this embodiment, the first protrusion 305 presses down on the end of the first connecting part 303 that is away from the second connecting part 304 along the first direction x, which can directly limit the free end of the first connecting part 303, improve the limiting effect, and prevent the end of the first connecting part 303 that is away from the second connecting part 304 along the first direction x from lifting up.

[0214] In some embodiments, such as Figure 14 and Figure 16 As shown, the first protrusion 305 is located in the region where the inner end of the second connecting portion 304 is not connected to the first connecting portion 303 along the first direction x. The first connecting portion 303 is provided with a second protrusion 306 at the end away from the second connecting portion 304 along the first direction x. The first protrusion 305 and the second protrusion 306 limit each other in the thickness direction of the first wall.

[0215] For example, the second protrusion 306 may extend along the entire length of the first connecting portion 303 in the second direction y to increase the limiting area and make the installation of the terminal 30 more secure.

[0216] This embodiment provides a first protrusion 305 on the second connecting portion 304 of one terminal 30 and a second protrusion 306 on the first connecting portion 303 of the other terminal 30, thereby enabling the two terminals 30 to mutually limit each other in the thickness direction of the first wall. The first protrusion 305 is located on the side away from the first wall relative to the second protrusion 306 to prevent the free end of the first connecting portion 303 from warping along the first direction x.

[0217] In some embodiments, such as Figure 15 and Figure 16 The first protrusion 305 and the second protrusion 306 have a gap along the thickness direction of the first wall. The outer wall of the first protrusion 305 along the first direction x has a gap with the side wall of the first connecting portion 303 of the other terminal 30. The outer wall of the second protrusion 306 along the first direction x has a gap with the side wall of the second connecting portion 304 of the other terminal 30. The two terminals 30 have opposite polarities. The terminal assembly 3 also includes a first insulating member 32, at least a portion of which is disposed in the gap.

[0218] This embodiment, by placing a portion of the first insulating member 32 within the gap formed by the first protrusion 305 and the second protrusion 306, can both allow the first protrusion 305 to press against the second protrusion 306 through the portion of the first insulating member 32 located within the gap, and also insulate the two terminals 30, thereby improving insulation reliability.

[0219] In some embodiments, such as Figure 20 As shown, at least two terminals 30 are spaced apart along a first direction x, where the first direction x is the length direction of the first wall.

[0220] The terminal assembly 3 of this embodiment arranges at least two terminals 3 side by side along the first direction x, which can make full use of the larger space of the first wall along the first direction x, and there is enough space to arrange at least two terminals 3. It is also beneficial to design the terminals 3 to be larger in size, especially to increase the size of the terminals 30 along the second direction y, which facilitates increasing the connection area between the tabs and the busbar 202 and the terminals 30, improving the connection strength and the current carrying capacity.

[0221] In some embodiments, such as Figure 7 As shown, the terminal assembly 3 is located in the middle region of the first wall along the first direction x.

[0222] In this embodiment, the terminal assembly 3 is located in the middle region of the first wall along the first direction x, and the opening on the first wall is also located in the middle region. This makes the structural strength distribution of the first wall along the first direction x on both sides more balanced, and the internal tabs are also close to the terminals 30 when connected, which facilitates connection. For example, when using the adapter 6 for connection, adapters 6 of similar size can also be used. In addition, when multiple battery cells 100 are grouped together, if it is necessary to press the first wall with a pressure strip, there is sufficient space on both sides of the terminal assembly 3 to install pressure strips respectively, which is beneficial to increasing the width of the pressure strips.

[0223] Optionally, such as Figure 6 As shown, the terminal assembly 3 can also be located at a position on the first wall that is offset from the middle area along the first direction x. When multiple battery cells 100 are grouped together, if it is necessary to press the first wall with a pressure strip, a wider pressure strip can be set only on the side with a larger space of the terminal assembly 3.

[0224] In some embodiments, the cross-section of the terminal 30 is circular or rectangular.

[0225] In this embodiment, the terminal 30 is designed with a circular cross-section, which optimizes manufacturing performance, improves the strength of the terminal 30 itself, reduces local stress, reduces the weight of the terminal 30, lowers costs, and facilitates welding, thereby improving the assembly efficiency of the battery cells 100. Alternatively, the terminal 30 can be designed with a rectangular cross-section, which facilitates the arrangement design according to the size of the electrode assembly 4, provides a larger welding area for the busbar 202, and improves connection strength and current carrying capacity. Optionally, the terminal 30 can also be a combination of the advantages of these two terminal shapes, or designed as an irregular structure.

[0226] In some embodiments, such as Figure 9 and Figure 10As shown, the battery cell 100 also includes an electrode assembly 4 and an adapter 6 disposed within the housing 10. The electrode assembly 4 includes an electrode body 41 and a tab. The tab extends from the electrode body 41 and is electrically connected to the corresponding terminal 30 via an adapter 6. The electrical connection area of ​​the tab and the adapter 6 is offset from the electrical connection area of ​​the terminal 30 and the adapter 6 along a first direction x, where the first direction x is the length direction of the first wall.

[0227] Among them, such as Figure 8 and Figure 9 As shown, the electrode assembly 4 includes an electrode body 41, a first tab 42, and a second tab 43. The first tab and the second tab have opposite polarities and both extend from the side of the electrode body 41 toward the first wall. The terminal assembly 3 has two terminals 30, including two first terminals 33 and second terminals 34 with opposite polarities. The adapter 6 has two adapters, including a first adapter 61 and a second adapter 62. The first tab 42 is connected to the first terminal 33 via the first adapter 61, and the first tab 42 and the first terminal 33 are connected along the first direction x in different areas of the first adapter 61. The second tab 43 is connected to the second terminal 34 via the second adapter 62, and the second tab 43 and the second terminal 34 are connected along the first direction x in different areas of the second adapter 62.

[0228] For example, the first terminal 33 can be a negative terminal, and the second terminal 34 can be a positive terminal. To facilitate electrical connection between the negative terminal and the first adapter 61, if welding is used, the negative terminal is designed as a composite structure, including a first part 331 and a second part 332. The first part 331 is made of copper, and the second part 332 is made of the same material as the first adapter 61, such as aluminum, so as to improve the welding effect when welding the second part 332 and the first adapter 61 and prevent cracks from occurring due to the large difference in thermal expansion coefficients.

[0229] This embodiment, by providing an adapter 6, can simultaneously adapt to the positions of the tab and the corresponding terminal 30, facilitating the electrical connection of the tab and the terminal 30; moreover, the electrical connection area of ​​the tab and the adapter 6 is offset from the electrical connection area of ​​the terminal 30 and the adapter 6 along the first direction x, which can ensure that both the tab and the terminal 30 are reliably connected to the adapter 6.

[0230] In some embodiments, such as Figure 10 As shown, adapter 6 is flat.

[0231] Wherein, one end of the adapter 6 extends beyond the terminal 30 along the first direction x, which can increase the connection area between the terminal 30 and the adapter 6. The other end of the adapter 6 extends beyond the tab along the first direction x, which can increase the connection area between the tab and the adapter 6, thereby increasing the connection strength and improving the current carrying capacity.

[0232] In this embodiment, the adapter 6 is designed as a flat plate, which is simple to process and can be fully abutted against the second insulating member 5 provided on the inner side of the first wall, making the installation of the adapter 6 more stable.

[0233] In some embodiments, the terminal assembly 3 is located on the first wall at a position offset from the middle region along the first direction x, and the battery cell 100 further includes a pressure relief component 11, which is configured to relieve pressure when the pressure in the battery cell 100 exceeds a preset threshold. The pressure relief component 11 is located on the first wall, and the first direction x is the length direction of the first wall.

[0234] The first wall can be equipped with a terminal assembly 3, a pressure relief component 11, and a liquid injection hole 20.

[0235] In this embodiment, since the terminal assembly 3 is located on the first wall at a position offset from the middle region along the first direction x, sufficient space can be left in the middle region of the first wall to install the pressure relief component 11. When the battery cell 100 experiences thermal runaway, the internal high-pressure gas can be discharged through the central hole of the electrode assembly 4 and discharged in time through the pressure relief component 11, which can improve the reliability and safety of the battery cell 100.

[0236] In some embodiments, such as Figure 7 As shown, the terminal assembly 3 is located in the middle region of the first wall along the first direction x. The battery cell 100 also includes a pressure relief component 11, which is configured to relieve pressure when the pressure in the battery cell 100 exceeds a preset threshold. The pressure relief component 11 is located on the wall of the housing 10 opposite to or adjacent to the first wall. The first direction x is the length direction of the first wall.

[0237] The first wall may be provided with a terminal assembly 3 and an injection hole 20, and the pressure relief component 11 may be provided on a wall opposite to or adjacent to the first wall.

[0238] In this embodiment, the terminal assembly 3 is located in the middle region of the first wall along the first direction x, occupying the space of the middle region. The pressure relief component 11 cannot be installed in this region. By placing the pressure relief component 11 on the wall opposite to or adjacent to the first wall, the pressure relief component 11 can be kept away from the terminal assembly 3. When the battery cell 100 experiences thermal runaway, the high-temperature and high-pressure gas discharged through the pressure relief component 11 can be kept as far away from the terminal assembly 3 as possible, reducing the risk of short circuit and improving the safety of the battery cell 100 operation.

[0239] Secondly, based on the above-described embodiments of the battery cell 100, in some embodiments, such as Figure 5As shown, the battery 200 of this application includes a battery module 200', which includes a busbar 202 and a plurality of battery cells 100. The plurality of battery cells 100 are arranged side by side along the second direction y. The two terminals 30 include a first terminal 33 and a second terminal 34. The first end of the busbar 202 is electrically connected to the first terminal 33 of one of the battery cells 100, and the second end of the busbar 202 is electrically connected to the second terminal 34 of the other battery cell 100.

[0240] For example, the first terminal 33 and the second terminal 34 have opposite polarities, which allows multiple battery cells 100 to be connected in series.

[0241] In this embodiment, the battery cell 100 integrates the first terminal 33 and the second terminal 34. When the battery module 200' is formed by connecting the busbars 202, the electrical connection can be achieved by welding, for example, which can reduce the movement range of the welding equipment. All busbars 202 can be connected within a small range along the first direction x of the first wall, thereby improving the production efficiency of the battery 200.

[0242] In some embodiments, such as Figure 5 As shown, the main body 301 of both terminals 30 includes a first connecting portion 303, and the first connecting portions 303 of each of the two terminals 30 are arranged along the second direction y.

[0243] In the same battery module 200', multiple battery cells 100 have the same terminal configuration. The busbar 202 extends along the second direction y, and the first end of the busbar 202 is electrically connected to the first connection portion 303 of one of the battery cells 100, and the second end of the busbar 202 is electrically connected to the first connection portion 303 of another battery cell 100.

[0244] In this embodiment, the main body 301 of the terminal 30 includes a first connecting portion 303, and two first connecting portions 303 are arranged along the second direction y. When the battery cells 100 are grouped together, it is not necessary to stagger the multiple busbars 202, which facilitates connection operations. For example, during welding, it is not necessary to repeatedly adjust the position of the welding tool along the first direction x, which can improve the production efficiency of the battery 200. Moreover, since the first connecting portions 303 of the two terminals 30 in the terminal assembly 3 jointly occupy the space of the first wall along the second direction y, the length of the busbar 202 can be shortened when connecting two adjacent first connecting portions 303 through the busbar 202, reducing material consumption. In addition, each first connecting portion 303 extends along the first direction x, and can be designed with a suitable extension length according to the requirements to meet the width requirements of the busbar 202, thereby achieving a larger current carrying capacity. Furthermore, multiple battery cells 100 in the same battery module 200' have the same terminal arrangement, eliminating the need to set different battery cells 100, which can reduce assembly difficulty.

[0245] In some embodiments, such as Figure 20 and Figure 21 As shown, two terminals 30 are spaced apart along the first direction x, and the terminal assembly 3 is located in the middle region of the first wall along the first direction x, with the first direction x perpendicular to the second direction y.

[0246] In the same battery module 200', multiple battery cells 100 have the same terminal 30 arrangement. In adjacent battery cells 100, the first terminal 33 of one battery cell 100 and the second terminal 34 of another battery cell 100 are arranged along the second direction y.

[0247] In this embodiment, since two terminals 30 with opposite polarities are spaced apart along the first direction x, in order to realize the series connection of multiple battery cells 100, the first terminal 33 of one battery cell 100 needs to be directly opposite the second terminal 34 of another battery cell 100. Therefore, the terminal 30 of adjacent battery cells 100 are arranged differently. By setting the terminal assembly 3 along the first direction x in the middle area of ​​the first wall, when forming the battery module 200', battery cells 100 with the same terminal arrangement can be used. It is only necessary to rotate the spaced battery cells 100 by 180°. Different battery cells 100 do not need to be set in the same battery module 200', which can reduce the assembly difficulty.

[0248] The following will provide two specific embodiments of the battery cell 100 of this application, with the first wall being the end cap 2 as an example.

[0249] In the first embodiment, such as Figures 6 to 19 As shown, the battery cell 100 includes a housing 10 and an electrode assembly 4. The housing 10 includes a shell 1 and an end cap 2. The shell 1 has an opening, and the end cap 2 covers the opening. The electrode assembly 4 includes an electrode body 41 and electrode tabs. The electrode tabs extend from the electrode body 41 and include a first electrode tab 42 and a second electrode tab 43 with opposite polarities. A terminal assembly 3 is disposed on the end cap 2. The end cap 2 has a groove 21, and the bottom wall of the groove is spaced two through holes 22 along a first direction x.

[0250] The terminal assembly 3 includes a connector 31, a first insulating member 32, a first terminal 33 and a second terminal 34 with opposite polarities. The connector 31 includes a base 311, a limiting part 312 and a connecting part 313. The base 311 has an annular structure and surrounds the first terminal 33 and the second terminal 34. The base 311 is disposed in the groove 21 and is connected by welding or flanging 23. The limiting part 312 is used to limit the protrusion 302 of the terminal 30. There is a gap between the limiting part 312 and the protrusion 302 along the thickness direction of the end cover 2 (third direction z, the third direction z is perpendicular to the first direction x and the second direction y). There is a gap between the side wall of the protrusion 302 and the inner side wall of the connecting part 313.

[0251] The first insulating member 32 includes an annular portion 321 and an intermediate plate 322. The annular portion 321 surrounds at least two terminals 30 and covers the outside of the connector 31. The intermediate plate 322 is connected inside the annular portion 321 and is disposed at one end of the annular portion 321 near the end cap 2 along a third direction z. The intermediate plate 322 has two mounting holes 323 spaced apart along a first direction x. The terminal 30 includes a main body portion 301, which includes a first connecting portion 303 and a second connecting portion 304. The first connecting portion 303 is configured to be electrically connected to other battery cells 100, and the second connecting portion 304 is configured to be electrically connected to a corresponding tab. The first connecting portions 303 of each of the two terminals 30 are arranged along a second direction y, and the second connecting portions 304 of each of the two terminals 30 are arranged along a first direction x.

[0252] A sealing element 7, such as a sealing ring, is provided between the bottom wall of the groove 21 and the second connecting part 304. The second connecting part 304 passes through the through hole 22 provided in the bottom wall of the groove 21 and is connected to the electrode ear through the adapter 6. In order to prevent short circuit between the end cap 2 and the electrode ear, a second insulating element 5 is provided between the end cap 2 and the adapter 6. The second insulating element 5 includes a main plate 51. The main plate 51 has thickened portions 52 at both ends and in the middle area along the first direction x on the side away from the end cap 2. The thickened portion 52 in the middle area has a recessed portion 53 on the side facing the end cap 2. An extension portion 54 is provided on the surface of the main plate 51 facing the end cap 2 at a position corresponding to the through hole 22. The extension portion 54 is inserted into the through hole 22 to achieve insulation between the second connecting part 304 and the end cap 2.

[0253] like Figure 5 As shown, when this type of battery cell 100 is used to form a battery module 200', the battery module 200' includes a plurality of battery cells 100 arranged side by side along the second direction y. The first end of the busbar 202 is electrically connected to the first connection portion 303 of the first terminal 33 of one of the battery cells 100, and the second end of the busbar 202 is electrically connected to the first connection portion 303 of the second terminal 34 of another battery cell 100.

[0254] In the second embodiment, such as Figures 20 to 21 As shown, the difference from the first embodiment is that the first terminal 33 and the second terminal 34 are spaced apart along the first direction x, and the intermediate plate 322 is disposed along the third direction z at the end of the annular portion 321 away from the end cap 2. This structure can make full use of the larger space of the first wall along the first direction x, providing sufficient space to arrange at least two terminals 30, and is conducive to designing the terminals 30 to be larger in size, especially increasing the size of the terminals 30 along the second direction y, which facilitates increasing the connection area between the tabs and the busbar 202 and the terminals 30, improving the connection strength and current carrying capacity.

[0255] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. 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 (100) characterized by, include: The outer casing (10) includes a first wall; An electrode assembly (4) is disposed within the housing (10). The electrode assembly (4) includes an electrode body (41) and a tab, the tab extending from the electrode body (41). and The terminal assembly (3) includes a connector (31) and at least two terminals (30), both of which are disposed on the first wall. The connector (31) is at least partially disposed around the at least two terminals (30). The terminals (30) are at least partially disposed between the connector (31) and the first wall along the thickness direction of the first wall. The connector (31) is connected to the first wall, and the terminals (30) are electrically connected to corresponding tabs.

2. The battery cell (100) according to claim 1, characterized in that The connector (31) is a closed ring structure to surround at least two of the terminals (30).

3. The battery cell (100) according to claim 1, characterized in that, At least two of the terminals (30) are opposite in polarity, and the terminal assembly (3) further includes a first insulating member (32) which is at least partially disposed between the terminals (30) of opposite polarity.

4. The battery cell (100) according to claim 3, characterized in that, The first insulating member (32) is at least partially disposed between the terminal (30) and the first wall, and / or the first insulating member (32) is at least partially disposed between the terminal (30) and the connector (31).

5. The battery cell (100) according to claim 1, characterized in that, The terminal (30) includes a main body (301) and a protrusion (302), the protrusion (302) being disposed on the side wall of the main body (301) and extending circumferentially along at least a portion of the terminal (30); The connector (31) includes: The base (311) is connected to the first wall; and A limiting part (312) is connected to the base (311) and is at least partially disposed on the side of the protrusion (302) away from the first wall.

6. The battery cell (100) according to claim 5, characterized in that, The connector (31) further includes a connecting part (313), which is connected between the base (311) and the limiting part (312) and is disposed opposite to the side wall of the protrusion (302).

7. The battery cell (100) according to claim 6, characterized in that, The connector (31) further includes a transition portion (314) connected between the limiting portion (312) and the connecting portion (313).

8. The battery cell (100) according to claim 5, characterized in that, The first wall has a groove (21), and the base (311) is at least partially accommodated in the groove (21).

9. The battery cell (100) according to claim 8, characterized in that, The mating surfaces of the base (311) and the groove (21) are connected by a weld (24); or The first wall is provided with a flange (23) at the edge of the groove (21), the flange (23) being at least partially located on the side of the base (311) away from the bottom surface of the groove (21).

10. The battery cell (100) according to claim 3, characterized in that, The first insulating member (32) includes an annular portion (321) surrounding at least two of the terminals (30) and covering at least a portion of the outer side of the connector (31).

11. The battery cell (100) according to claim 10, characterized in that, The first insulating member (32) further includes an intermediate plate (322), which is connected to the annular portion (321). The intermediate plate (322) has two mounting holes (323) spaced apart along a first direction (x), where the first direction (x) is the length direction of the first wall. At least a portion of the terminal (30) passes through the mounting hole (323) and is electrically connected to the corresponding tab. The terminal (30) protrudes from the annular portion (321).

12. The battery cell (100) according to any one of claims 1 to 11, characterized in that, At least two of the terminals (30) each include a main body (301), the main body (301) comprising: The first connecting part (303) is configured to be electrically connected to the other battery cells (100); The two first connecting parts (303) are arranged along the second direction (y), which is the width direction of the first wall.

13. The battery cell (100) according to claim 12, characterized in that, The main body (301) further includes a second connecting part (304) configured to be electrically connected to the corresponding electrode tab, wherein the second connecting part (304) is connected to the first connecting part (303); The second connecting portions (304) of each of the two terminals (30) are arranged along a first direction (x), which is perpendicular to the second direction (y).

14. The battery cell (100) according to claim 13, characterized in that, The terminal (30) is provided in two parts, and the two terminals (30) have opposite polarities. The terminal assembly (3) also includes a first insulating member (32), which includes an isolation portion (324). The isolation portion (324) includes: Two first partitions (3241) extend along the second direction (y) and are disposed between a first connecting portion (303) of one of the terminals (30) and a second connecting portion (304) of the other terminal (30); and The second partition (3242) extends along the first direction (x) and is disposed between the first connecting portions (303) of the two terminals (30), and the two ends of the second partition (3242) are respectively connected to the ends of the two first partitions (3241).

15. The battery cell (100) according to claim 14, characterized in that, The top surface of the isolation section (324) is further away from the first wall than the outer surface of the terminal (30).

16. The battery cell (100) according to claim 13, characterized in that, The two terminals (30) have opposite polarities. The terminal assembly (3) further includes a first insulating member (32), which includes an annular portion (321) and an intermediate plate (322). The annular portion (321) surrounds the two terminals (30) and covers at least part of the outer side of the connector (31). The intermediate plate (322) is connected to the inner wall of the annular portion (321) near the first wall along the thickness direction of the first wall. The intermediate plate (322) has two mounting holes (323) spaced apart along the first direction (x). The second connecting portion (304) passes through the mounting holes (323). The first connecting portion (303) is located on the side of the intermediate plate (322) away from the first wall.

17. The battery cell (100) according to claim 13, characterized in that, In the terminal assembly (3), one of the terminals (30) is provided with a first protrusion (305), and along the thickness direction of the first wall, the first protrusion (305) is at least partially disposed on the side of the first connection portion (303) of the other terminal (30) away from the first wall.

18. The battery cell (100) according to claim 17, characterized in that, The first protrusion (305) is configured to press against one end of the first connecting portion (303) away from the second connecting portion (304) along the first direction (x).

19. The battery cell (100) according to claim 17, characterized in that, The first protrusion (305) is provided in the region where the inner end of the second connecting part (304) along the first direction (x) is not connected to the first connecting part (303). The first connecting part (303) is provided with a second protrusion (306) at the end along the first direction (x) away from the second connecting part (304). The first protrusion (305) and the second protrusion (306) limit each other in the thickness direction of the first wall.

20. The battery cell (100) according to claim 19, characterized in that, The first protrusion (305) and the second protrusion (306) have a gap along the thickness direction of the first wall. The first protrusion (305) has a gap between its outer wall along the first direction (x) and the side wall of the first connecting portion (303) of the other terminal (30). The second protrusion (306) has a gap between its outer wall along the first direction (x) and the side wall of the second connecting portion (304) of the other terminal (30). The two terminals (30) have opposite polarities. The terminal assembly (3) also includes a first insulating member (32), at least a portion of which is disposed in the gap.

21. The battery cell (100) according to any one of claims 1 to 11, characterized in that, At least two of the terminals (30) are spaced apart along a first direction (x), which is the length direction of the first wall.

22. The battery cell (100) according to claim 21, characterized in that, The terminal assembly (3) is located in the middle region of the first wall along the first direction (x).

23. The battery cell (100) according to claim 21, characterized in that, The cross-section of the terminal (30) is circular or rectangular.

24. The battery cell (100) according to any one of claims 1 to 11, characterized in that, It also includes an electrode assembly (4) and an adapter (6) disposed within the housing (10). The electrode assembly (4) includes an electrode body (41) and a tab. The tab extends from the electrode body (41) and is electrically connected to the corresponding terminal (30) via an adapter (6). The electrical connection area of ​​the tab and the adapter (6) is offset from the electrical connection area of ​​the terminal (30) and the adapter (6) along a first direction (x), where the first direction (x) is the length direction of the first wall.

25. The battery cell (100) according to claim 24, characterized in that, The adapter (6) is flat.

26. The battery cell (100) according to any one of claims 1 to 11, characterized in that, The terminal assembly (3) is located on the first wall at a position offset from the middle region along the first direction (x). The battery cell (100) also includes a pressure relief component (11) configured to relieve pressure when the pressure in the battery cell (100) exceeds a preset threshold. The pressure relief component (11) is located on the first wall, and the first direction (x) is the length direction of the first wall.

27. The battery cell (100) according to any one of claims 1 to 11, characterized in that, The terminal assembly (3) is located in the middle region of the first wall along the first direction (x). The battery cell (100) also includes a pressure relief component (11) configured to relieve pressure when the pressure in the battery cell (100) exceeds a preset threshold. The pressure relief component (11) is located on the wall of the housing (10) opposite to or adjacent to the first wall. The first direction (x) is the length direction of the first wall.

28. A battery (200), characterized in that, Includes the battery cell (100) as described in any one of claims 1 to 27.

29. The battery (200) according to claim 28, characterized in that, The battery module (200') includes a busbar (202) and a plurality of battery cells (100), which are arranged side by side along a second direction (y). The two terminals (30) include a first terminal (33) and a second terminal (34). The first end of the busbar (202) is electrically connected to the first terminal (33) of one of the battery cells (100), and the second end of the busbar (202) is electrically connected to the second terminal (34) of the other battery cell (100).

30. The battery (200) according to claim 29, characterized in that, The main body (301) of both terminals (30) includes a first connecting portion (303), and the first connecting portions (303) of each of the two terminals (30) are arranged along the second direction (y); wherein, multiple battery cells (100) in the same battery module (200') have the same terminal arrangement, the busbar (202) extends along the second direction (y), and the first end of the busbar (202) is electrically connected to the first connecting portion (303) of one of the battery cells (100), and the second end of the busbar (202) is electrically connected to the first connecting portion (303) of another battery cell (100).

31. The battery (200) according to claim 29, characterized in that, The two terminals (30) are spaced apart along a first direction (x), and the terminal assembly (3) is located in the middle region of the first wall along the first direction (x), which is perpendicular to the second direction (y). In the same battery module (200'), multiple battery cells (100) have the same terminal (30) arrangement. In adjacent battery cells (100), the first terminal (33) of one battery cell (100) and the second terminal (34) of another battery cell (100) are arranged along the second direction (y).

32. An electrical appliance, characterized in that, Includes a battery cell (100) according to any one of claims 1 to 27, and / or a battery (200) according to any one of claims 28 to 31, wherein the battery cell (100) or the battery (200) is used to provide electrical energy to the electrical device.

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