Battery cell, battery device, power consuming device, and energy storage device
By designing the connection surface length ratio of the adapter plate, the increase in hardness is reduced, the connection effect between the adapter plate and the tab is improved, and the stability of the battery cell is enhanced.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CONTEMPORARY AMPEREX TECHNOLOGY CO LTD
- Filing Date
- 2025-04-29
- Publication Date
- 2026-06-05
Smart Images
Figure CN224328851U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of battery technology, and in particular to a battery cell, battery device, power supply device, and energy storage device. Background Technology
[0002] Energy conservation and emission reduction are key to sustainable social development. Rechargeable batteries, with their ability to store and release energy as needed, are widely used in various electrical devices and energy storage systems, and are an important component in promoting energy transition and sustainable development. For the new energy industry, battery technology is a crucial factor in its development.
[0003] The tabs and terminals of a battery cell are connected by an adapter. During the manufacturing process, the adapter undergoes physical treatments such as bending or thinning to ensure it meets requirements. However, these physical treatments increase the adapter's hardness, which can affect the connection between the adapter and the tabs, thus impacting the stability of the battery cell. Utility Model Content
[0004] This application aims to at least solve one of the technical problems existing in the background art. Therefore, one object of this application is to provide a battery cell, battery device, power consumption device, and energy storage device to improve the stability of the battery cell.
[0005] An embodiment of the first aspect of this application provides a battery cell, the battery cell comprising: an adapter piece including a first adapter portion, a second adapter portion, and a connecting portion, wherein a first connecting surface of the connecting portion is connected to a first surface of the first adapter portion, and a second connecting surface of the connecting portion is connected to a second surface of the second adapter portion; both the first connecting surface and the first surface extend along a first direction, and the length of the first connecting surface is less than the length of the first surface along the first direction; both the second connecting surface and the second surface extend along a second direction, and the length of the second connecting surface is less than the length of the second surface along the second direction; an electrode assembly having tabs connected to the first adapter portion; and an end cap having electrode terminals connected to the second adapter portion.
[0006] In the technical solution of this application embodiment, the first adapter and the second adapter are indirectly connected by a connecting part. The length of the first connecting surface is less than the length of the first surface, and the length of the second connecting surface is less than the length of the second surface. That is, the size of the connection between the connecting part and the first adapter and the second adapter is reduced. During the thinning process of the second adapter, the amount of material of the adapter piece accumulated on the first adapter through the connecting part is also reduced, which reduces the increase in hardness of the first adapter, thereby improving the connection effect between the adapter piece and the tab and improving the stability of the battery cell.
[0007] In some embodiments, the ratio of the length of the first connecting surface to the length of the first surface is greater than or equal to 0.2 and less than or equal to 0.4. Setting the ratio of the length of the first connecting surface to the length of the first surface within the above range allows for a sufficiently large area of the connection portion between the connecting part and the first adapter, improving the connection strength between the connecting part and the first adapter; on the other hand, a smaller connection portion between the connecting part and the first adapter reduces the possibility of an increase in the hardness of the first adapter.
[0008] In some embodiments, the ratio of the length of the second connecting surface to the length of the second surface is greater than or equal to 0.4 and less than or equal to 0.6. Setting the ratio of the length of the second connecting surface to the length of the second surface within the above range allows for a sufficiently large area of the connection portion between the connecting part and the second transition part, improving the connection strength between the connecting part and the second transition part; on the other hand, a smaller connection portion between the connecting part and the second transition part reduces the possibility of an increase in the hardness of the first transition part.
[0009] In some embodiments, the length of the first side is greater than the length of the second side. The length of the first adapter portion is greater than the length of the second adapter portion, which can make reasonable use of the space within the battery cell, allowing the adapter piece to connect the tab and the electrode terminal, while also reducing the volume of the adapter piece, which can increase the energy density of the battery cell to a certain extent.
[0010] In some embodiments, the ratio of the length of the second surface to the length of the first surface is greater than or equal to 0.4 and less than or equal to 0.8. The ratio of the length of the first surface to the length of the second surface can be set according to the actual positions of the tabs and electrode terminals.
[0011] In some embodiments, the thickness of the first adapter portion is greater than the thickness of the second adapter portion. The thickness of the second adapter portion is smaller, which facilitates the connection between the second adapter portion and the electrode terminal by laser welding.
[0012] In some embodiments, the adapter includes two first adapter portions and two connecting portions. The two first adapter portions are located on opposite sides of the second adapter portion, and are connected to the opposite sides of the second adapter portion via the two connecting portions. The battery cell includes two electrode assemblies, and the two first adapter portions are connected to the tabs of the two electrode assemblies respectively. One adapter connects the tabs of two electrode assemblies, and the two first adapter portions facilitate connection between the adapter and the tabs of the electrode assemblies.
[0013] In some embodiments, one of the first adapter portions has a foolproof notch on the side away from the second adapter portion. The foolproof notch prevents the adapter from being placed backwards during installation, reducing the error rate when installing the adapter.
[0014] In some embodiments, the second adapter has a positioning protrusion on one side, and the positioning protrusion and the first adapter are located on different sides of the second adapter. The positioning protrusion is used to mate with the positioning groove on the end cap, which facilitates quick positioning of the adapter piece during installation and improves installation efficiency.
[0015] In some embodiments, the connecting portion is a curved connecting portion. By setting the connecting portion as a curved connecting portion, a height difference can be made between the first connecting portion and the second connecting portion when the adapter piece is installed, and a gap can be made between the second connecting portion and the end cap. This gap can be used to place the electrode terminals, which can make more rational use of the space inside the battery cell and improve the energy density of the battery cell.
[0016] In some embodiments, the first direction and the second direction are the same. Positioning the first and second adapter portions on opposite sides of the connector reduces the space occupied by the adapter piece within the battery cell, which is beneficial for increasing the energy density of the battery cell.
[0017] In some embodiments, the Vickers hardness of the first adapter portion is less than or equal to 68. Limiting the Vickers hardness of the first adapter portion to less than or equal to 68 avoids negatively impacting the morphology and effectiveness of the welding between the electrode tab and the adapter piece due to excessively high Vickers hardness.
[0018] In some embodiments, the adapter piece is made of either copper or aluminum. Copper and aluminum are both common conductive materials. Using copper and aluminum as the material for the adapter piece can reduce the manufacturing cost of the adapter piece. Furthermore, since both copper and aluminum are metals, it is convenient to weld the adapter piece to the tabs and electrode terminals.
[0019] An embodiment of the second aspect of this application provides a battery device, which includes the battery cell described in the above embodiments.
[0020] An embodiment of the third aspect of this application provides an electrical device, which includes the battery device described in the above embodiments, and the battery device is used to provide electrical energy.
[0021] An embodiment of the fourth aspect of this application provides an energy storage device, which includes the battery device described in the above embodiments, and the battery device is used to store electrical energy.
[0022] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description
[0023] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the various drawings denote the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings depict only some embodiments disclosed in this application and should not be construed as limiting the scope of this application.
[0024] Figure 1 This is an exploded structural diagram of a battery cell according to some embodiments of this application;
[0025] Figure 2 This is a schematic diagram of the structure of an adapter piece provided in an embodiment of this application;
[0026] Figure 3 A top view of an adapter piece provided in an embodiment of this application;
[0027] Figure 4 A bottom view of an adapter plate provided in an embodiment of this application;
[0028] Figure 5 for Figure 3 Cross-sectional view of surface AA;
[0029] Figure 6 An enlarged view of the cross-sectional view of the connection portion provided in the embodiments of this application;
[0030] Figure 7 This is a schematic diagram illustrating the connection between an adapter plate, an electrode assembly, and an end cap, as provided in an embodiment of this application.
[0031] Figure 8 This is a top view of an adapter plate connected to an electrode assembly and an end cap, provided as an embodiment of this application.
[0032] Figure 9 This is an exploded view of the battery device according to some embodiments of this application;
[0033] Figure 10 This is a schematic diagram of the structure of a vehicle according to some embodiments of this application.
[0034] Explanation of reference numerals in the attached figures:
[0035] 100. Adapter piece; 10. First adapter part; 11. First surface; 12. Foolproof notch; 20. Second adapter part; 21. Second surface; 22. Positioning protrusion; 30. Connecting part; 31. First connecting surface; 32. Second connecting surface; 40. Embossing; 200. Electrode assembly; 201. Electrode tab; 300. End cap; 301. Electrode terminal; 302. Pressure relief mechanism; 400. Housing; 1000. Battery cell; 2000. Housing; 2001. First part; 2002. Second part; 01. Vehicle; 1. Battery device; 2. Controller; 3. Controller. Detailed Implementation
[0036] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.
[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.
[0038] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.
[0039] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.
[0040] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.
[0041] 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).
[0042] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.
[0043] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.
[0044] Currently, the application of rechargeable batteries is becoming increasingly widespread, judging from market trends. They are not only used in energy storage systems for hydropower, thermal power, wind power, and solar power plants, but also extensively in various electronic devices, such as electric bicycles, electric motorcycles, and electric vehicles, as well as in equipment and aerospace. With the continuous expansion of rechargeable battery applications, market demand is also constantly increasing.
[0045] A battery cell includes an electrode assembly and an end cap. The electrode assembly has tabs, and the end cap has electrode terminals. The tabs and electrode terminals are connected by an adapter plate. Typically, the adapter plate is connected to the electrode terminals via laser welding, or to the tabs via ultrasonic welding. To improve the current carrying capacity of the battery cell, the adapter plate is usually thickened to prevent the tabs from melting. If the thickness of the welded portion between the adapter plate and the electrode terminals is too high, it will prevent welding. Related technologies involve thinning the welded portion between the adapter plate and the electrode terminals. This thinning process increases the deformation of the adapter plate, leading to increased hardness. However, if the hardness of the welded portion between the adapter plate and the tabs is too high, it will result in a poor weld morphology and effect, affecting the stability of the battery cell.
[0046] This application provides a battery cell including an adapter plate, an electrode assembly, and an end cap. The electrode assembly has tabs, and the end cap has electrode terminals. The adapter plate includes a first adapter portion, a second adapter portion, and a connecting portion. A first connecting surface of the connecting portion is connected to a first surface of the first adapter portion, and a second connecting surface of the connecting portion is connected to a second surface of the second adapter portion. Both the first connecting surface and the first surface extend along a first direction, and the length of the first connecting surface is less than the length of the first surface along the first direction. Both the second connecting surface and the second surface extend along a second direction, and the length of the second connecting surface is less than the length of the second surface along the second direction. The first adapter portion is connected to the tabs, and the second adapter portion is connected to the electrode terminals. The reduced size at the connection point between the connecting portion and the first and second adapter portions, during the thinning process of the second adapter portion, also reduces the amount of material from the adapter plate accumulating through the connecting portion to the first adapter portion, thus reducing the increase in hardness of the first adapter portion. This improves the connection effect between the adapter plate and the tabs, and enhances the stability of the battery cell.
[0047] The battery cells disclosed in this application can be used, but are not limited to, in electrical devices or energy storage devices such as vehicles, ships, or aircraft. A power system comprising the electrical device or energy storage device can be constructed using the battery cells and battery devices disclosed in this application, which is beneficial to the stability of the battery device, electrical device, or energy storage device.
[0048] This application provides a single battery cell. Figure 1 This is an exploded structural diagram of a battery cell according to some embodiments of this application. See also... Figure 1 The battery cell 1000 includes an adapter plate 100, an electrode assembly 200, and an end cap 300. The electrode assembly 200 has tabs 201, and the end cap 300 has electrode terminals 301.
[0049] Figure 2 This is a schematic diagram of the structure of an adapter plate provided in an embodiment of this application. See also... Figure 2 The adapter plate 100 includes a first adapter part 10, a second adapter part 20, and a connecting part 30.
[0050] Figure 3 This is a top view of an adapter plate provided in an embodiment of this application. Figure 4 This is a bottom view of an adapter plate provided in an embodiment of this application. Figure 5 for Figure 3 Cross-sectional view of surface AA. Figure 6 This is an enlarged view of the cross-sectional view of the connection portion provided in an embodiment of this application. See also... Figures 2 to 6 The first connecting surface 31 of the connecting part 30 is connected to the first surface 11 of the first adapter part 10, and the second connecting surface 32 of the connecting part 30 is connected to the second surface 21 of the second adapter part 20.
[0051] Both the first connecting surface 31 and the first surface 11 extend along the first direction X, and the length L1 of the first connecting surface 31 is less than the length L2 of the first surface 11 along the first direction X. Both the second connecting surface 32 and the second surface 21 extend along the second direction Y, and the length L3 of the second connecting surface 32 is less than the length L4 of the second surface 21 along the second direction Y.
[0052] Figure 7 This is a schematic diagram of the structure for connecting an adapter plate to an electrode assembly and an end cap, provided in an embodiment of this application. Figure 8 This is a top view illustrating the connection between an adapter plate, an electrode assembly, and an end cap, as provided in an embodiment of this application. See also... Figure 7 and Figure 8 The tab 201 is connected to the first adapter 10, and the electrode terminal 301 is connected to the second adapter 20.
[0053] like Figure 1 The battery cell 1000 includes an end cap 300, a housing 400, an electrode assembly 200, and other functional components.
[0054] End cap 300 refers to a component that covers the opening of housing 400 to isolate the internal environment of battery cell 1000 from the external environment. Not limited to this, the shape of end cap 300 can be adapted to the shape of housing 400 to fit the housing 400. Optionally, end cap 300 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that end cap 300 is not easily deformed under compression and impact, allowing battery cell 1000 to have higher structural strength and improved safety performance. Functional components such as electrode terminals 301 can be provided on end cap 300. Electrode terminals 301 can be used for electrical connection with electrode assembly 200 for outputting or inputting electrical energy into battery cell 1000. In some embodiments, see... Figure 7 and Figure 8 The end cap 300 may also be provided with a pressure relief mechanism 302 for releasing internal pressure when the internal pressure or temperature of the battery cell 1000 reaches a threshold. The end cap 300 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, or plastic. In some embodiments, an insulating member may be provided on the inner side of the end cap 300. The insulating member can be used to isolate the electrical connection components within the housing 400 from the end cap 300 to reduce the risk of short circuits. For example, the insulating member may be made of plastic, rubber, etc.
[0055] The housing 400 is a component used to cooperate with the end cap 300 to form the internal environment of the battery cell 1000. This internal environment can accommodate the electrode assembly 200, electrolyte, and other components. The housing 400 and the end cap 300 can be independent components. An opening can be provided on the housing 400, and the end cap 300 closes the opening to form the internal environment of the battery cell 1000. Alternatively, the end cap 300 and the housing 400 can be integrated. Specifically, the end cap 300 and the housing 400 can form a common connecting surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing 400, the end cap 300 closes the housing 400. The housing 400 can be of various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 400 can be determined according to the specific shape and size of the electrode assembly 200. The housing 400 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.
[0056] Electrode assembly 200 is the component in the battery cell 1000 where electrochemical reactions occur. The housing 400 may contain one or more electrode assemblies 200. The electrode assembly 200 is mainly formed by winding or stacking positive and negative electrode sheets, and typically a separator is provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active material constitute the main body of the electrode assembly, while the portions of the positive and negative electrode sheets without active material each constitute a tab 201. The positive and negative tabs may be located together at one end of the main body or separately at both ends of the main body. During the charging and discharging process of the battery device, the positive and negative active materials react with the electrolyte, and the tabs 201 connect to the electrode terminals 301 via adapter pieces 100 to form a current loop.
[0057] In the embodiments of this application, the first adapter 10 is connected to the tab 201, and the second adapter 20 is connected to the electrode terminal 301, so that the electrical energy of the tab 201 can be transferred to the electrode terminal 301 through the adapter piece 100.
[0058] For example, the first adapter 10 can be connected to the tab 201 by ultrasonic welding, and the second adapter 20 can be connected to the electrode terminal 301 by laser welding.
[0059] In embodiments of this application, the first connecting surface 31 can be a plane or a curved surface, and the first surface 11 has a portion that matches the first connecting surface 31, thereby enabling the first connecting surface 31 to connect with the first surface 11. When the first connecting surface 31 is a plane, the first connecting surface 31 is parallel to the first direction X.
[0060] In embodiments of this application, the second connecting surface 32 can be a plane or a curved surface, and the second surface 21 has a portion that matches the second connecting surface 32, thereby enabling the second connecting surface 32 and the second surface 21 to be connected. When the second connecting surface 32 is a plane, it is parallel to the second direction Y.
[0061] The adapter 100 provided in this embodiment is used in a battery device. The adapter 100 is relatively thin. Both the first connecting surface 31 and the first surface 11 extend along the first direction X, that is, both the first connecting surface 31 and the first surface 11 are elongated. The first direction X is the length direction of the first connecting surface 31 and the first surface 11. Both the second connecting surface 32 and the second surface 21 extend along the second direction Y, that is, both the second connecting surface 32 and the second surface 21 are elongated. The second direction Y is the length direction of the second connecting surface 32 and the second surface 21.
[0062] In the embodiments of this application, the length L1 of the first connecting surface 31 is less than the length L2 of the first surface 11; the length L3 of the second connecting surface 32 is less than the length L4 of the second surface 21. Then, the area of the connection portion between the connecting part 30 and the first transition part 10 is the area of the first connecting surface 31, and the area of the connection portion between the connecting part 30 and the second transition part 20 is the area of the second connecting surface 32.
[0063] During the thinning process of the second adapter 20, the adapter piece 100 is compressed and deformed. The material of the adapter piece 100 accumulates on the first adapter 10 through the connecting part 30, increasing the hardness of the first adapter 10. This process is called work hardening. However, the increased hardness of the first adapter 10 will affect the morphology and effect of the ultrasonic welding between the first adapter 10 and the tab 201.
[0064] It should be noted that the above-mentioned work hardening process is a physical change.
[0065] In the embodiments of this application, the first direction X and the second direction Y can be the same or different.
[0066] In the embodiments of this application, the first adapter 10 and the second adapter 20 are indirectly connected by the connecting part 30. The length L1 of the first connecting surface 31 is less than the length L2 of the first surface 11, and the length L3 of the second connecting surface 32 is less than the length L4 of the second surface 21. That is, the size of the connection between the connecting part 30 and the first adapter 10 and the second adapter 20 is reduced. During the thinning process of the second adapter 20, the amount of material of the adapter piece 100 accumulated on the first adapter 10 through the connecting part 30 is also reduced, which reduces the increase in hardness of the first adapter 10, thereby improving the connection effect between the adapter piece 100 and the tab 201 and improving the stability of the battery cell 100.
[0067] In the embodiments of this application, the first adapter 10, the second adapter 20 and the connecting part 30 may be integrally formed; or the first adapter 10, the second adapter 20 and the connecting part 30 may be manufactured separately and then connected together.
[0068] According to some embodiments of this application, the ratio of the length L1 of the first connecting surface 31 to the length L2 of the first surface 11 is greater than or equal to 0.2 and less than or equal to 0.4.
[0069] For example, the ratio of the length L1 of the first connecting surface 31 to the length L2 of the first surface 11 is equal to 0.2; or the ratio of the length L1 of the first connecting surface 31 to the length L2 of the first surface 11 is equal to 0.25; or the ratio of the length L1 of the first connecting surface 31 to the length L2 of the first surface 11 is equal to 0.3; or the ratio of the length L1 of the first connecting surface 31 to the length L2 of the first surface 11 is equal to 0.35; or the ratio of the length L1 of the first connecting surface 31 to the length L2 of the first surface 11 is equal to 0.4.
[0070] In the embodiments of this application, the ratio of the length L1 of the first connecting surface 31 to the length L2 of the first surface 11 is set within the above range. On the one hand, this makes the area of the connecting portion 30 and the first adapter portion 10 sufficiently large, thereby improving the connection strength between the connecting portion 30 and the first adapter portion 10. On the other hand, the connecting portion 30 and the first adapter portion 10 is relatively small, reducing the possibility of an increase in the hardness of the first adapter portion 10.
[0071] According to some embodiments of this application, the ratio of the length L3 of the second connecting surface 32 to the length L4 of the second surface 21 is greater than or equal to 0.4 and less than or equal to 0.6.
[0072] For example, the ratio of the length L3 of the second connecting surface 32 to the length L4 of the second surface 21 is equal to 0.4; or the ratio of the length L3 of the second connecting surface 32 to the length L4 of the second surface 21 is equal to 0.45; or the ratio of the length L3 of the second connecting surface 32 to the length L4 of the second surface 21 is equal to 0.5; or the ratio of the length L3 of the second connecting surface 32 to the length L4 of the second surface 21 is equal to 0.55; or the ratio of the length L3 of the second connecting surface 32 to the length L4 of the second surface 21 is equal to 0.6.
[0073] In the embodiments of this application, the ratio of the length L3 of the second connecting surface 32 to the length L4 of the second surface 21 is set within the above range. On the one hand, this makes the area of the connecting portion of the connecting part 30 and the second transition part 20 large enough, thereby improving the connection strength between the connecting part 30 and the second transition part 20. On the other hand, the connecting portion of the connecting part 30 and the second transition part 20 is small, reducing the possibility of an increase in the hardness of the first transition part 10.
[0074] In some embodiments of this application, the length L1 of the first connecting surface 31 is equal to the length L3 of the second connecting surface 32.
[0075] According to some embodiments of this application, the length L2 of the first surface 11 is greater than the length L4 of the second surface 21.
[0076] The internal space of the battery cell 1000 is limited. In the battery cell 1000, the tab 201 and the electrode terminal 301 are misaligned, so an adapter piece 100 is required to connect the tab 201 and the electrode terminal 301. The length L2 of the first surface 11 is greater than the length L4 of the second surface 21, which can be understood as the length of the first adapter part 10 being greater than the length of the second adapter part 20.
[0077] In the embodiments of this application, the length of the first adapter 10 is greater than the length of the second adapter 20, which can make reasonable use of the space inside the battery cell 1000, so that the adapter 100 can connect the tab 201 and the electrode terminal 301, while reducing the volume of the adapter 100, which can increase the energy density of the battery cell 1000 to a certain extent.
[0078] According to some embodiments of this application, the ratio of the length L4 of the second surface 21 to the length L2 of the first surface 11 is greater than or equal to 0.4 and less than or equal to 0.8.
[0079] For example, the ratio of the length L4 of the second face 21 to the length L2 of the first face 11 is equal to 0.4; or the ratio of the length L4 of the second face 21 to the length L2 of the first face 11 is equal to 0.45; or the ratio of the length L4 of the second face 21 to the length L2 of the first face 11 is equal to 0.5; or the ratio of the length L4 of the second face 21 to the length L2 of the first face 11 is equal to 0.55; or the ratio of the length L4 of the second face 21 to the length L2 of the first face 11 is equal to 0.6; or the ratio of the length L4 of the second face 21 to the length L2 of the first face 11 is equal to 0.65; or the ratio of the length L4 of the second face 21 to the length L2 of the first face 11 is equal to 0.7; or the ratio of the length L4 of the second face 21 to the length L2 of the first face 11 is equal to 0.75; or the ratio of the length L4 of the second face 21 to the length L2 of the first face 11 is equal to 0.8.
[0080] In the embodiments of this application, the ratio of the length L2 of the first surface 11 to the length L4 of the second surface 21 can be set in conjunction with the actual positions of the tab 201 and the electrode terminal 301.
[0081] According to some embodiments of this application, the thickness D1 of the first adapter 10 is greater than the thickness D2 of the second adapter 20.
[0082] In the embodiments of this application, both the first adapter 10 and the second adapter 20 are sheet-like structures.
[0083] In the embodiments of this application, the thickness D2 of the second adapter 20 is small, which facilitates the connection between the second adapter 20 and the electrode terminal 301 by laser welding.
[0084] According to some embodiments of this application, see Figures 2 to 5 The adapter plate 100 includes two first adapter portions 10 and two connecting portions 30. The two first adapter portions 10 are respectively located on opposite sides of the second adapter portion 20, and the two first adapter portions 10 are respectively connected to the opposite sides of the second adapter portion 20 through the two connecting portions 30. See also Figure 1 , Figure 7 and Figure 8 The battery cell 1000 includes two electrode assemblies 200, and two first adapters 10 are respectively connected to the tabs 201 of the two electrode assemblies 200.
[0085] In embodiments of this application, the second adapter 20 has two second surfaces 21, which are located on opposite sides of the second adapter 20; the two connecting parts 30 have the same structure, each connecting part 30 having a first connecting surface 31 and a second connecting surface 32, with the two second connecting surfaces 32 respectively connected to the two second surfaces 21; the two first adapters 10 have the same structure, each first adapter 10 having a first surface 11, with the two first connecting surfaces 31 respectively connected to the two first surfaces 11. See also Figure 7 and Figure 8 An adapter 100 connects the tabs 201 of two electrode assemblies 200.
[0086] In the battery cell 1000, an adapter piece 100 connects the tabs 201 of two electrode assemblies 200, and two first adapter parts 10 are provided to facilitate the connection between the adapter piece 100 and the tabs 201 of the electrode assembly 200.
[0087] For example, the tab 201 of one of the two electrode assemblies 200 is connected to one of the two first adapters 10, and the tab 201 of the other electrode assembly 200 is connected to the other of the two first adapters 10.
[0088] According to some embodiments of this application, see Figures 2 to 4 One of the first adapters 10 has a foolproof notch 12 on the side away from the second adapter 20.
[0089] In an embodiment of this application, the foolproof notch 12 can be formed by cutting one of the first transition portions 10.
[0090] In the embodiments of this application, a foolproof notch 12 is provided to prevent the adapter piece 100 from being placed backwards during the placement process, thereby reducing the error rate when installing the adapter piece 100.
[0091] According to some embodiments of this application, one side of the second adapter 20 has a positioning protrusion 22, and the positioning protrusion 22 and the first adapter 10 are located on different sides of the second adapter 20.
[0092] In the embodiments of this application, the main body of the second adapter 20 is shaped like a square piece, and the positioning protrusion 22 and the first adapter 10 are located on different sides of the main body of the second adapter 20.
[0093] In the embodiments of this application, the positioning protrusion 22 is used to cooperate with the positioning groove on the end cover 300, so as to facilitate quick positioning of the position of the adapter piece 100 when installing the adapter piece 100 and improve the installation efficiency.
[0094] According to some embodiments of this application, at least one of the first adapter 10 and the second adapter 20 has embossing 40.
[0095] For example, the first transition portion 10 has embossing 40, while the second transition portion 20 does not have embossing 40; or the first transition portion 10 does not have embossing 40, while the second transition portion 20 has embossing 40; or both the first transition portion 10 and the second transition portion 20 have embossing 40.
[0096] The 40-degree embossing design increases the micro-roughness of the contact surface, improving the friction of the welding surface and thus more effectively converting energy into heat, promoting the fusion of the weldment. The 40-degree embossing can alter the surface structure of the weldment, making it easier to concentrate the energy of welding vibrations in the contact area, reducing energy reflection or loss. Since surface oxides can affect weld quality during the welding process, the 40-degree embossing design helps to more effectively remove surface oxides when pressure is applied, allowing direct contact between the substrate and the weldment, thereby improving weld strength and conductivity. The 40-degree embossing design increases the actual contact area of the weldment, thereby improving the strength and reliability of the weld bond.
[0097] In the embodiments of this application, the embossing 40 on the surface of the first adapter 10 or the second adapter 20 may be a groove on the surface of the first adapter 10 or the second adapter 20.
[0098] For example, the depth of the embossing 40 on the surface of the first adapter 10 is greater than or equal to 0.02 mm and less than or equal to 0.08 mm; the depth of the embossing 40 on the surface of the second adapter 20 is greater than or equal to 0.05 mm and less than or equal to 0.11 mm.
[0099] According to some embodiments of this application, see Figure 5 and Figure 6 The connecting part 30 is a curved connecting part.
[0100] By configuring the connecting part 30 as a curved connecting part, a height difference can be created between the first connecting part 10 and the second connecting part 20 when the adapter piece 100 is installed, and a gap can be created between the second connecting part 20 and the end cap. See [reference needed]. Figure 7 This gap can be used to place the electrode terminal 301, which can make more rational use of the space inside the battery cell 1000 and improve the energy density of the battery cell 1000.
[0101] According to some embodiments of this application, the first direction X and the second direction Y are the same.
[0102] The first direction X and the second direction Y are the same, so that the first adapter 10 and the second adapter 20 are located on opposite sides of the connecting part 30, which can reduce the space occupied by the adapter piece 100 in the battery cell 1000 and help improve the energy density of the battery cell 1000.
[0103] According to some embodiments of this application, the Vickers (HV) hardness of the first adapter 10 is less than or equal to 68.
[0104] For example, the Vickers hardness of the first adapter 10 is 68; or the Vickers hardness of the first adapter 10 is 65; or the Vickers hardness of the first adapter 10 is 63; or the Vickers hardness of the first adapter 10 is 60; or the Vickers hardness of the first adapter 10 is 55.
[0105] In the embodiments of this application, the Vickers hardness of the first adapter 10 is limited to less than or equal to 68, so as to avoid the morphology and effect of welding between the tab 201 and the adapter piece 100 due to the Vickers hardness of the first adapter 10 being too high.
[0106] According to some embodiments of this application, the adapter piece 100 is made of either copper (Cu) or aluminum (Al).
[0107] In the embodiments of this application, when the material of the adapter piece 100 is copper, the thickness D2 of the second adapter portion 20 is less than or equal to 0.8 mm; when the material of the adapter piece 100 is aluminum, the thickness D2 of the second adapter portion 20 is less than or equal to 1.2 mm.
[0108] Copper and aluminum are both common conductive materials. Using copper and aluminum as the materials for the adapter piece 100 can reduce the manufacturing cost of the adapter piece 100. In addition, since copper and aluminum are both metals, it is convenient to weld the adapter piece 100 to the tab 201 and the electrode terminal 301.
[0109] Embodiments of this application also provide a battery device. Figure 9 This is an exploded view of a battery device according to some embodiments of this application. The battery device 1 includes the battery cell 1000 in the above embodiments.
[0110] A battery cell 1000 refers to the smallest unit constituting the battery device 1. The battery device 1 includes the battery cell 1000 and a housing 2000, with the battery cell 1000 housed within the housing 2000. The housing 2000 provides a space for the battery cell 1000 and can have various structures. In some embodiments, the housing 2000 may include a first portion 2001 and a second portion 2002, which overlap each other, and together define a space for accommodating the battery cell 1000. The second part 2002 can be a hollow structure with one open end, and the first part 2001 can be a plate-like structure. The first part 2001 covers the open side of the second part 2002 so that the first part 2001 and the second part 2002 together define the accommodating space. Alternatively, the first part 2001 and the second part 2002 can both be hollow structures with one open end, with the open side of the first part 2001 covering the open side of the second part 2002. Of course, the box 2000 formed by the first part 2001 and the second part 2002 can be of various shapes, such as a cylinder, a cuboid, etc.
[0111] In battery device 1, there can be multiple battery cells 1000. These multiple battery cells 1000 can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that the multiple battery cells 1000 are connected in both series and parallel. Multiple battery cells 1000 can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 1000 is housed within a housing 2000. Alternatively, battery device 1 can also consist of multiple battery cells 1000 first connected in series, parallel, or in a mixed configuration to form battery modules, and then these battery modules are connected in series, parallel, or in a mixed configuration to form a whole, which is also housed within the housing 2000. Battery device 1 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 1000.
[0112] Each battery cell 1000 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 1000 can be cylindrical, flat, cuboid, or other shapes.
[0113] In the battery device provided in this application embodiment, the increase in hardness of the first adapter portion is reduced, the connection effect between the adapter and the tab is improved, and the stability of the battery device is improved.
[0114] The embodiments of this application also provide an electrical device, which includes the battery device 1 in the above embodiments, and the battery device 1 is used to provide electrical energy.
[0115] This application provides an electrical device that uses a battery as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.
[0116] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device according to an embodiment of this application.
[0117] Please refer to Figure 10 , Figure 10 This is a schematic diagram of the structure of a vehicle provided in some embodiments of this application. Vehicle 01 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 1 is installed inside vehicle 01, and the battery device 1 can be located at the bottom, front, or rear of vehicle 01. The battery device 1 can be used to power vehicle 01; for example, the battery device 1 can serve as the operating power source for vehicle 01. Vehicle 01 may also include a controller 2 and a controller 3. Controller 2 is used to control the battery device 1 to supply power to controller 3, for example, to meet the power needs of vehicle 01 during startup, navigation, and driving.
[0118] In some embodiments of this application, the battery device 1 can not only serve as the operating power source for the vehicle 01, but also as the driving power source for the vehicle 01, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 01.
[0119] In the electrical device provided in this application embodiment, the increase in hardness of the first adapter portion is reduced, the connection effect between the adapter piece and the electrode tab is improved, and the stability of the electrical device is improved.
[0120] An embodiment of this application also provides an energy storage device, which includes the battery device in the above embodiments, and the battery device is used to store electrical energy.
[0121] Energy storage devices can be, but are not limited to, energy storage containers, energy storage cabinets, energy storage power stations, energy storage battery packs, or portable energy storage systems.
[0122] In the energy storage device provided in this application embodiment, the increase in hardness of the first adapter portion is reduced, the connection effect between the adapter plate and the electrode tab is improved, and the stability of the energy storage device is improved.
[0123] This application provides a battery cell 1000, which includes an adapter plate 100, an electrode assembly 200, and an end cap 300. The electrode assembly 200 has tabs 201, and the end cap 300 has electrode terminals 301. The adapter plate 100 includes a first adapter portion 10, a second adapter portion 20, and a connecting portion 30. The first connecting surface 31 of the connecting portion 30 is connected to the first surface 11 of the first adapter portion 10, and the second connecting surface 32 of the connecting portion 30 is connected to the second surface 21 of the second adapter portion 20. The first connecting surface 31, the second connecting surface 32, the first surface 11, and the second surface 21 all extend along a first direction X. Along the first direction X, the ratio of the length L1 of the first connecting surface 31 to the length L2 of the first surface 11 is greater than or equal to 0.2 and less than or equal to 0.4. The ratio of the length L3 of the second connecting surface 32 to the length L4 of the second surface 21 is greater than or equal to 0.4 and less than or equal to 0.6. The tab 201 is connected to the first adapter 10, and the electrode terminal 301 is connected to the second adapter 20.
[0124] The ratio of the length L4 of the second surface 21 to the length L2 of the first surface 11 is greater than or equal to 0.4 and less than or equal to 0.8. The thickness D1 of the first transition part 10 is greater than the thickness D2 of the second transition part 20.
[0125] The adapter 100 includes two first adapter portions 10 and two connecting portions 30. The two first adapter portions 10 are located on opposite sides of the second adapter portion 20, and the two first adapter portions 10 are connected to the opposite sides of the second adapter portion 20 via the two connecting portions 30. The battery cell 1000 includes two electrode assemblies 200, and the two first adapter portions 10 are connected to the tabs 201 of the two electrode assemblies 200 respectively. One of the first adapter portions 10 has a foolproof notch 12 on the side away from the second adapter portion 20.
[0126] The second adapter 20 has a positioning protrusion 22 on one side, and the positioning protrusion 22 and the first adapter 10 are located on different sides of the second adapter 20. The connecting part 30 is a bent connecting part. The Vickers hardness of the first adapter 10 is less than or equal to 68. The material of the adapter piece 100 includes copper and aluminum.
[0127] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.
Claims
1. A battery cell, characterized in that, The battery cell includes: The adapter plate (100) includes a first adapter portion (10), a second adapter portion (20), and a connecting portion (30). The first connecting surface (31) of the connecting portion (30) is connected to the first surface (11) of the first adapter portion (10), and the second connecting surface (32) of the connecting portion (30) is connected to the second surface (21) of the second adapter portion (20). Both the first connecting surface (31) and the first surface (11) extend along a first direction, and along the first direction, the length of the first connecting surface (31) is less than the length of the first surface (11). Both the second connecting surface (32) and the second surface (21) extend along a second direction, and along the second direction, the length of the second connecting surface (32) is less than the length of the second surface (21). The electrode assembly (200) has a tab (201) connected to the first adapter (10); The end cap (300) has an electrode terminal (301) connected to the second adapter (20).
2. The battery cell according to claim 1, characterized in that, The ratio of the length of the first connecting surface (31) to the length of the first surface (11) is greater than or equal to 0.2 and less than or equal to 0.
4.
3. The battery cell according to claim 1, characterized in that, The ratio of the length of the second connecting surface (32) to the length of the second surface (21) is greater than or equal to 0.4 and less than or equal to 0.
6.
4. The battery cell according to claim 1, characterized in that, The length of the first face (11) is greater than the length of the second face (21).
5. The battery cell according to claim 4, characterized in that, The ratio of the length of the second face (21) to the length of the first face (11) is greater than or equal to 0.4 and less than or equal to 0.
8.
6. The battery cell according to any one of claims 1 to 5, characterized in that, The thickness of the first adapter (10) is greater than the thickness of the second adapter (20).
7. The battery cell according to any one of claims 1 to 5, characterized in that, The adapter plate (100) includes two first adapter portions (10) and two connecting portions (30). The two first adapter portions (10) are located on opposite sides of the second adapter portion (20). The two first adapter portions (10) are connected to the opposite sides of the second adapter portion (20) through the two connecting portions (30). The battery cell includes two electrode assemblies (200). The two first adapter portions (10) are connected to the tabs (201) of the two electrode assemblies (200).
8. The battery cell according to claim 7, characterized in that, One of the first adapters (10) has a foolproof notch (12) on the side away from the second adapter (20).
9. The battery cell according to any one of claims 1 to 5, characterized in that, The second adapter (20) has a positioning protrusion (22) on one side, and the positioning protrusion (22) and the first adapter (10) are located on different sides of the second adapter (20).
10. The battery cell according to any one of claims 1 to 5, characterized in that, The connecting part (30) is a curved connecting part.
11. The battery cell according to any one of claims 1 to 5, characterized in that, The first direction and the second direction are the same.
12. The battery cell according to any one of claims 1 to 5, characterized in that, The Vickers hardness of the first adapter (10) is less than or equal to 68.
13. The battery cell according to any one of claims 1 to 5, characterized in that, The adapter plate (100) is made of either copper or aluminum.
14. A battery device, characterized in that, The battery device comprises a battery cell as described in any one of claims 1 to 13.
15. An electrical appliance, characterized in that, The electrical device includes the battery device as described in claim 14, the battery device being used to provide electrical energy.
16. An energy storage device, characterized in that, The energy storage device includes the battery device as described in claim 14, the battery device being used to store electrical energy.