Adapter member, battery cell, battery and electric device

Abstract

The invention provides an adapter member, a battery cell, a battery and an electric device. The switching component is used for the battery monomer, the switching component is in a folded and bent shape and comprises a plurality of sheet-shaped parts and at least one bent part for connecting the plurality of sheet-shaped parts, and at least one bent part is provided with a thinning area.

Description

Adapter component, battery cell, battery and electrical device Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a switching component, a battery cell, a battery, and an electrical device. Background Art

[0002] In related technologies, batteries include multiple battery cells connected in series and / or parallel. A battery cell is the smallest unit in a battery that provides energy. Its electrode terminals are typically electrically connected to the tabs of the battery cell assembly within its housing via a transition member, allowing electrical energy to be transferred from or to the battery cell.

[0003] Summary of the Invention

[0004] The present application aims to solve at least one of the technical problems existing in the related art. To this end, one object of the present application is to provide a transition component, a battery cell, a battery and an electrical device.

[0005] An embodiment of the first aspect of the present application provides a transition member for a battery cell, wherein the transition member is in a folded curved shape, comprising a plurality of sheet-like portions and at least one bent portion connecting the plurality of sheet-like portions, wherein at least one bent portion is provided with a thinning area.

[0006] The transition member of the embodiment of the present application is provided with a thinning area in at least one bending portion, and the maximum thickness of the thinning area is smaller than that of other areas of the transition member. This design makes it easier to bend the transition member during processing, and the bending position is more accurate and the molding accuracy is higher, thereby improving the performance and quality of the battery cell and the battery.

[0007] In some embodiments, the plurality of sheet portions include a first sheet portion and a second sheet portion, and the at least one bent portion includes a first bent portion. The first sheet portion, the first bent portion, and the second sheet portion are sequentially connected, wherein the first sheet portion is used to connect to an electrode terminal of a battery cell, and the second sheet portion is used to connect to a tab of the battery cell. The shape of the transition member can be flexibly designed according to actual needs.

[0008] In some embodiments, the plurality of sheet portions include a first sheet portion, a second sheet portion, and a third sheet portion, and the at least one bent portion includes a first bent portion and a second bent portion. The first sheet portion, the first bent portion, the second sheet portion, the second bent portion, and the third sheet portion are sequentially connected, wherein the first bent portion and the second bent portion have opposite bending directions. The first sheet portion is used to connect to the electrode terminal of the battery cell, and the third sheet portion is used to connect to the tab of the battery cell. The adapter member as a whole is generally bent in a Z-shape, which can better adapt to the internal space of the battery cell.

[0009] In some embodiments, thinning areas are provided on both the first bending portion and the second bending portion, so that the transition component is easier to bend during processing and has higher forming accuracy.

[0010] In some embodiments, the maximum thickness of the transition member is T1, and the thickness of each thinned area is T2, wherein T1 / 4 ≤ T2 ≤ 0.6 mm, preferably, T1 / 3 ≤ T2 ≤ 0.4 mm. In this way, the internal resistance design requirements, structural strength requirements, ease of implementation and precision requirements of the molding process of the transition member can be taken into account. When T1 / 3 ≤ T2 ≤ 0.4 mm, the transition member is easier to bend, higher molding precision can be achieved, and it is also easier to assemble in place in the battery cell.

[0011] In some embodiments, the maximum thickness of the transition member is not less than 0.3 mm and not more than 2 mm. The thickness of the sheet portion is designed with reference to this range to meet the structural strength requirements and internal resistance design requirements.

[0012] In some embodiments, the thickness of the thinned area is not less than 0.1 mm and not more than 0.6 mm. The thickness of the thinned area is designed with reference to this range, so that the bending portion is easy to bend and higher forming accuracy can be achieved.

[0013] In some embodiments, the width of a bent portion is equal to the width of the corresponding thinning area provided thereon. The width of the thinning area is designed to be as large as possible to make the bent portion easier to bend.

[0014] In some embodiments, the minimum gap between two adjacent sheet-like portions is H, and the width of the bent portion connecting the two adjacent sheet-like portions is L, where 3.14×H / 2≤L≤3.14×H. This embodiment allows the bent portion to have an appropriate bending radius, thereby facilitating molding and reducing the internal resistance of the transition component.

[0015] In some embodiments, the width of each bent portion is not less than 1 mm and not more than 10 mm. In this way, the bent portion can be placed at an appropriate bending radius, thereby facilitating molding.

[0016] In some embodiments, each bent portion forms a thinning groove on one side or both sides of the thinning area. The thinning groove can be formed by selecting an appropriate process according to actual needs.

[0017] In some embodiments, the sidewalls of the thinned groove are sloped away from the center of the groove to make machining easier.

[0018] In some embodiments, one of the multiple sheet-like portions is used to weld to a tab of a battery cell. This sheet-like portion includes a main body region and a welding region. The bent portion is connected to the main body region. The main body region has a thickness of T1, and the thinned region has a thickness of T2, where T1 / 4 ≤ T2 ≤ 0.6 mm. This not only ensures the required structural strength of the main body region, but also makes the bent portion easier to bend.

[0019] In some embodiments, the welding region has at least one welding groove that is raised away from the adjacent sheet portion. The design of the welding groove not only improves structural strength but also increases the reliability of the welding contact between the transition member and the tab, making the connection more reliable, thereby improving the performance and service life of the battery cell.

[0020] An embodiment of the second aspect of the present application provides a battery cell, comprising: a shell having a accommodating cavity; an end cover connected to the shell to close the accommodating cavity; a battery cell assembly arranged in the accommodating cavity and having a tab; an electrode terminal arranged on the end cover; and a transition member of any of the aforementioned embodiments, wherein the transition member connects the tab and the electrode terminal.

[0021] In some embodiments, the battery cell assembly is a wound battery cell assembly, and the battery cell includes a cylindrical shell and a positive end cap and a negative end cap, wherein the positive end cap is covered on one end of the shell and the negative end cap is covered on the other end of the shell.

[0022] The transition member of the above battery cell is easy to form at the bend, and the bending position is relatively accurate and the forming precision is high, so the performance and quality of the battery cell are improved.

[0023] The third aspect of the present application provides a battery comprising a plurality of battery cells of the aforementioned aspects connected in series and / or in parallel. Based on the above design of the transition member of the battery cells, the battery can achieve corresponding technical effects, and the performance and quality can be improved accordingly.

[0024] The fourth aspect of the present application provides an electric device comprising the battery cell of the aforementioned aspect. The battery performance and quality of the electric device can be improved accordingly based on the aforementioned design of the transition component in the battery cell.

[0025] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar components or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in this application and should not be construed as limiting the scope of this application.

[0027] FIG1 is a schematic structural diagram of a vehicle according to some embodiments of the present application;

[0028] FIG2A is a schematic diagram of the disassembled structure of a battery according to some embodiments of the present application;

[0029] FIG2B is a schematic diagram of the disassembled structure of a battery according to some embodiments of the present application;

[0030] FIG3A is a schematic diagram of the disassembled structure of a battery cell according to some embodiments of the present application;

[0031] FIG3B is a schematic diagram of the three-dimensional structure of the positive terminal cover of a battery cell according to some embodiments of the present application;

[0032] FIG3C is a schematic diagram of the cross-sectional structure taken along the AA direction in FIG3B ;

[0033] FIG4A is a schematic diagram of the three-dimensional structure of a transition member according to some embodiments of the present application;

[0034] FIG4B is a schematic diagram of the cross-sectional structure taken along line BB in FIG4A ;

[0035] FIG5A is a schematic diagram of a three-dimensional structure of a transition member in a flattened state according to some embodiments of the present application;

[0036] FIG5B is a schematic diagram of the cross-sectional structure taken along the CC direction in FIG5A;

[0037] FIG5C is a schematic diagram of a three-dimensional structure of a transition member in a flattened state according to some other embodiments of the present application; and

[0038] FIG6 is a structural block diagram of an electrical device according to some embodiments of the present application.

[0039] Description of reference numerals:

[0040] 1000-Vehicle; 100-Battery; 200-Controller; 300-Motor; 120-Box; 10-Battery Cell;

[0041] 121-first part; 122-second part; 1200-battery module; 1201-fixing shell; 110-housing;

[0042] 102-positive terminal cap; 103-negative terminal cap; 107-negative electrode tab; 101-cell assembly; 106a-positive electrode terminal;

[0043] 106b - negative electrode terminal; 104 - liquid injection hole; 105 - pressure relief mechanism; 500 - adapter component;

[0044] 500a - positive electrode transfer member; 51 - sheet portion; 511 - first sheet portion; 512 - second sheet portion;

[0045] 513 - third sheet portion; 52 - bent portion; 521 - first bent portion; 522 - second bent portion;

[0046] 520-thinning area; 53-thinning groove; 5130-main body area; 5131-welding area; 55-welding groove; 56-perforation;

[0047] 57- positioning notch; 58- positioning hole 58; 2000- electrical device. DETAILED DESCRIPTION

[0048] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0050] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0051] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0052] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0053] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0054] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limiting the embodiments of the present application.

[0055] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0056] The electrode terminals of a battery cell are typically electrically connected to the tabs of a cell assembly via a transition member, allowing for the transfer of electrical energy from or to the battery cell. As battery power increases, the thickness of the transition member sheet material is also being designed to increase. In some applications, the transition member needs to be designed in a bent shape. However, the thicker the sheet material is, the more difficult it is to bend and achieve the required precision.

[0057] Based on the above considerations, the inventors have conducted in-depth research and provided a transition component, a battery cell, a battery and an electrical device. The transition component is easy to form at the bend, and the bending position is relatively accurate and the forming accuracy is high, thereby improving the performance and quality of the battery cell and the battery.

[0058] The battery cells disclosed in the embodiments of this application can be used in power batteries or energy storage batteries. Applications for power batteries include, but are not limited to, vehicles, ships, aircraft, spacecraft, power tools, electric toys, and various mobile devices. Applications for energy storage batteries include, but are not limited to, solar power generation systems, hydropower generation systems, wind power generation systems, and the like.

[0059] Figure 1 shows a schematic diagram of a vehicle 1000 according to some embodiments of the present application. The specific type of vehicle 1000 is not limited, and may be, for example, a new energy electric vehicle. The vehicle 1000 includes a battery 100, a controller 200, and a motor 300. The battery 100 can power various electrical modules of the vehicle, such as the controller 200, the motor 300, and the control system and air conditioning (not shown).

[0060] As shown in Figure 2A, it is a schematic structural diagram of a battery 100 provided in some embodiments of the present application, and the battery 100 includes a housing 120 and a plurality of battery cells 10 located in the housing 120. The housing 120 provides a storage space for the battery cells 10. The housing 120 may include a first portion 121 and a second portion 122, the first portion 121 and the second portion 122 covering each other, and the first portion 121 and the second portion 122 jointly define a storage space. In the battery 100, the plurality of battery cells 10 may be connected in series, in parallel, or in a mixed connection, wherein the mixed connection refers to the connection method of the plurality of battery cells 10 having both series and parallel connections. When assembling the battery 100, the plurality of battery cells 10 may be first connected together in a series, in parallel, or in a mixed connection, and then the plurality of battery cells 10 may be placed as a whole in the housing 120.

[0061] As shown in FIG2B , the battery 100 provided in some other embodiments of the present application includes a housing 120 and a plurality of battery modules 1200 located within the housing 120. The housing 120 may include a first portion 121 and a second portion 122, which together define a storage space. Each battery module 1200 includes a fixed housing 1201 and a plurality of battery cells 10 located within the fixed housing 1201 and connected in series, parallel, or in a hybrid manner. In addition, the battery 100 may further include a busbar component (not shown in the figure) for achieving electrical connection between the plurality of battery modules 1200.

[0062] As shown in Figures 3A, 3B, and 3C, the battery cell 10 provided in some embodiments of the present application includes a shell 110 having a accommodating cavity, end caps connected to the shell 110 (such as the positive end cap 102 and the negative end cap 103), a battery cell assembly 101 disposed in the shell 110 and having tabs (such as the negative tab 107 and the positive tab not shown in the figure due to viewing angle), electrode terminals (such as the positive electrode terminal 106a and the negative electrode terminal 106b) disposed on the end caps, and a transition member 500 provided in some of the following embodiments of the present application (such as the positive transition member 500a and the negative transition member not shown in the figure due to viewing angle; the positive transition member and the negative transition member can adopt the same structural design). In addition, the battery cell 10 generally also includes an electrolyte (not shown in the figure) located in the shell 110.

[0063] The positive electrode transition member 500a can be connected (e.g., by welding or riveting) to the positive electrode terminal 106a and the positive electrode tab, and the negative electrode transition member can be connected (e.g., by welding or riveting) to the negative electrode terminal 106b and the negative electrode tab 107, to achieve electrical connection between the electrode terminals and the corresponding tabs. The positive electrode terminal 106a and the negative electrode terminal 106b are used to connect to external conductive structures to output electrical energy from the battery cell 10 or input electrical energy to the battery cell 10. In addition, the positive electrode terminals 106a and negative electrode terminals 106b of multiple battery cells 10 and the external circuit design can be used to achieve series, parallel, or mixed connection of multiple battery cells 10.

[0064] As shown in Figures 3A, 3B, and 3C, in some embodiments, the battery cell assembly 101 is a wound battery cell assembly, the shell is cylindrical (e.g., cylindrical, square, or flat), the positive end cap 102 is covered on one end of the shell 110, and the negative end cap 103 is covered on the other end of the shell 110. The positive electrode terminal 106a is provided on the positive end cap 102 (as shown in Figure 3B), and the negative electrode terminal 106b is provided on the negative end cap 103 (as shown in Figure 3A). The positive end cap 102 and the negative end cap 103 can each be provided with a raised structure, and the positive electrode terminal 106a (e.g., two positive electrode terminals 106a in the figure) and the negative electrode terminal 106b (e.g., two negative electrode terminals 106b in the figure) are respectively embedded in the corresponding raised structures. In addition, a liquid injection hole 104 for injecting electrolyte can be provided on the positive terminal cover 102 and / or the negative terminal cover 103, and a pressure relief mechanism 105, such as an explosion-proof valve, can also be provided on the positive terminal cover 102 and / or the negative terminal cover 103.

[0065] In this embodiment, the battery cell assembly 101 is mainly formed by winding a positive electrode sheet and a negative electrode sheet (not shown in the figure), and a separator (not shown in the figure) is provided between the positive electrode sheet and the negative electrode sheet. The portion of the positive electrode sheet and the negative electrode sheet provided with active material each serve as their main body, and the portion of the positive electrode sheet and the negative electrode sheet not provided with active material each constitute the positive electrode tab and the negative electrode tab 107. In this embodiment, the positive electrode tab and the negative electrode tab 107 are located at both ends of the main body and have been flattened to form a flat shape.

[0066] The transition member provided in the embodiments of the present application is used with a battery cell (e.g., battery cell 10 shown in FIG3A ). The transition member has an overall folded, curved shape, comprising multiple sheet-like portions and at least one bent portion connecting the multiple sheet-like portions. At least one of the bent portions has a thinned region. This design of the transition member makes it easier to bend during processing, with more accurate bend positions and higher molding precision, thereby improving the performance and quality of the battery cell and battery.

[0067] As shown in Figures 4A, 4B, 5A and 5B, Figure 4A is a schematic diagram of the three-dimensional structure of the transition component of some embodiments of the present application, Figure 4B is a schematic diagram of the cross-sectional structure cut along the BB direction in Figure 4A, Figure 5A is a schematic diagram of the three-dimensional structure of the transition component of some embodiments of the present application in a flattened state, and Figure 5B is a schematic diagram of the cross-sectional structure cut along the CC direction in Figure 5A.

[0068] The transition member 500 for a battery cell provided in an embodiment of the present application has an overall folded curved shape, including a plurality of sheet portions 51 and at least one bent portion 52 connecting the plurality of sheet portions 51 , wherein at least one bent portion 52 is provided with a thinning area 520 .

[0069] The transition member 500 can be made of sheet metal. In the embodiment of the present application, the overall shape of the sheet portion 51 is roughly flat, and the bent portion 52 is bent relative to the sheet portion 51 and is curved, so that the transition member 500 as a whole presents a folded curved shape. The transition member 500 is in a folded curved shape as a whole, which can better adapt to the internal space of the battery cell. The transition member 500 is connected to the electrode terminal and the tab of the battery cell assembly inside the battery cell (for example, it can be welded or riveted), which can play a good conductive connection role.

[0070] The thinned area 520 of the bent portion 52 has been thinned, so its thickness is smaller than the maximum thickness of other areas of the transition member 500. Given the thinned area 520, the thickness of each sheet portion 51 and the bent portion 52 other than the thinned area 520 can be uniform. Furthermore, some sheet portions 51 can also be thinned in localized areas.

[0071] In the embodiment of the present application, “thickness” is defined as the thickness of the sheet material of a certain portion or region of the transition component 500 , rather than the thickness caused by its overall structural shape.

[0072] The adapter member 500 of the present embodiment has a thinned region 520 on at least one bent portion 52. This thinned region 520 has a smaller maximum thickness than other regions of the adapter member 500. Compared to adapter members without a thinning design in the related art, the adapter member 500 provided in the present embodiment is easier to bend during processing, with more accurate bending positions and higher molding precision, thereby improving the performance and quality of the battery cells and batteries.

[0073] In the embodiment of the present application, the thinning process for the thinning region 520 can be achieved by using at least one machining process such as forging, stamping, upsetting, and material removal. The thinning process can be performed on any side of the thinning region 520 to achieve the desired thickness. Alternatively, the thinning process can be performed first on one side of the thinning region 520, and then on the other side to ultimately achieve the desired thickness.

[0074] As shown in Figures 5A, 5B, and 5C, due to the thinning process performed on the thinning region 520, the bent portion 52 forms a thinning groove 53 in the thinning region 520. In this embodiment, the thinning groove 53 is formed on one side of the thinning region 520. The design of the thinning groove 53 allows the thinning region 520 to have a relatively small thickness, thereby making it easier to bend the transition member 500 during processing and achieving a more accurate bending position.

[0075] As shown in FIG5C , in this embodiment, a thinning groove 53 may also be formed on the other side of the thinning region 520. In addition, thinning grooves 53 may also be formed on both sides of the thinning region 520. The thinning grooves 53 may be flexibly designed according to process and design requirements.

[0076] As shown in FIG. 5B , the sidewalls of the thinning groove 43 are inclined away from the center of the groove, thereby forming a chamfered structure, which makes processing easier.

[0077] As shown in Figure 5B, in the embodiment of the present application, the width of the bent portion 52 is defined as the size of the relatively smaller narrow edge of the bent portion 52 when the bent portion 52 is in a flattened state. That is, the width of the bent portion 52 is the size of the bent portion 52 in the length direction of the transition member 500 when the transition member 500 is in a flattened state.

[0078] The width of the thinned region 520 is defined as the bottom width of the thinned groove 53 formed in the thinned region 520 when the transition member 500 is flattened. As shown in FIG5B , the width of the bent portion 52 can be equal to the width of the corresponding thinned region 520. In other words, the bent portion 52 is thinned as a whole, making its thickness less than the maximum thickness of the rest of the transition member 500.

[0079] In some embodiments, the width of the bending portion 52 may also be greater than the width of the corresponding thinning area 520 set thereon, that is, only a part of the bending portion 52 is thinned. In this way, the technical effect of easy bending and more accurate bending position can still be achieved.

[0080] The folding and bending shape of the transition member 500 is not limited, and it includes multiple sheet portions 51 and at least one bent portion 52. In some embodiments, as shown in Figures 4A and 4B, the multiple sheet portions 51 include a first sheet portion 511, a second sheet portion 512, and a third sheet portion 513, and the at least one bent portion 52 includes a first bent portion 521 and a second bent portion 522. The first sheet portion 511, the first bent portion 521, the second sheet portion 512, the second bent portion 522, and the third sheet portion 513 are connected in sequence, wherein the first bent portion 521 and the second bent portion 522 are bent in opposite directions, so that the transition member 500 as a whole is generally Z-shaped. The first sheet portion 511 is used to connect to the electrode terminal of the battery cell, which can achieve electrical connection between the transition member 500 and the electrode terminal. The third sheet portion 513 is used to connect to the tab of the battery cell, which can achieve electrical connection between the transition member 500 and the tab. The transition member 500 can be made of sheet materials with good electrical conductivity, such as aluminum and copper.

[0081] In this embodiment, thinning areas 520 are provided on both the first bending portion 521 and the second bending portion 522 , so that both bending portions of the transition member 500 are easy to bend during processing, and the forming accuracy is higher.

[0082] In other embodiments, the multiple sheet portions of the transition member may further include a first sheet portion and a second sheet portion, and the at least one bent portion of the transition member may include a first bent portion. The first sheet portion, the first bent portion, and the second sheet portion are sequentially connected, wherein the first sheet portion is used to connect to the electrode terminal of the battery cell, and the second sheet portion is used to connect to the tab of the battery cell. The shape of the transition member can be flexibly designed as needed.

[0083] In some embodiments, the sheet portion 51 of the transition member 500 for connecting to the electrode terminal, such as the first sheet portion 511, is provided with a through-hole 56 for assembly with the electrode terminal. When the battery cell is assembled, the electrode terminal is inserted into the through-hole 56 and welded to the first sheet portion 511. As shown in FIG4A , the edge of the first sheet portion 511 may have a positioning notch 57. The shape of the positioning notch 57 is not limited, and it can cooperate with the corresponding positioning structure designed in the battery cell, thereby improving the installation accuracy of the transition member 500 and reducing the difficulty of assembly. The through-hole 56 and the positioning notch 57 can be formed by a stamping process.

[0084] In some embodiments, the sheet portion 51 of the transition member 500 for connecting to the tab, such as the third sheet portion 513, includes a main body region 5130 and a welding region 5131. The main body region 5130 is integrally connected to the second bent portion 522, and the welding region 5131 is used for welding to the tab.

[0085] As shown in FIG4A , in some embodiments, the welding area 5131 has at least one welding groove 55 that bulges away from the adjacent sheet portion 51 (i.e., away from the second sheet portion 512). The welding groove 55 bulges away from the adjacent sheet portion 51, that is, it bulges toward the tab of the battery cell assembly after being assembled with the battery cell assembly. The welding groove 55 can be formed by a stamping process. The number and specific structural form of the welding grooves 55 are not limited and can be various appropriate shapes, such as V-shaped, cross-shaped, circular, strip-shaped, etc. As shown in FIG5A , in this embodiment, the third sheet portion 513 has two V-shaped and symmetrically arranged welding grooves 55.

[0086] The design of the welding groove 55 not only improves structural strength but also increases the reliability of the welding contact between the adapter member 500 and the tab, making the connection more reliable, thereby improving the performance and service life of the battery cell. In some embodiments, the third sheet portion 513 is designed with a positioning hole 58 for positioning during welding, which can improve the accuracy of the weld assembly.

[0087] In some embodiments of the present application, the thickness of the welding region 5131 of the third sheet portion 513 can be designed to be thinner than the thickness of its main region 5130. Since the welding region 5131 is mainly used for welding to the tab, designing its thickness to be thinner than the main region 5130 can reduce welding stress, improve the strength of the welding connection between the welding region 5131 and the tab, and make the welding more reliable.

[0088] In the embodiment of the present application, the specific shape, specifications and dimensions of the adapter member 500 should be designed accordingly in combination with the specific specifications and dimensions of the battery cell and related components.

[0089] As shown in FIG. 5B , in some embodiments, the maximum thickness of the transition member 500 is T1 , and the thickness of each thinned area 520 is T2 , wherein T1 / 4 ≤ T2 ≤ 0.6 mm, preferably, T1 / 3 ≤ T2 ≤ 0.4 mm.

[0090] In this embodiment, the maximum thickness of each sheet portion 51 can be T1, and the thickness of each thinned area 520 can be T2. Designing an appropriate thickness for the thinned area 520 can take into account the internal resistance design requirements, structural strength requirements, and ease of implementation and precision requirements of the molding process of the transition member 500.

[0091] After a large number of experiments, the inventors of the present application concluded that when T1 / 3≤T2≤0.4 mm, the transition member 500 is easier to bend, can achieve higher molding accuracy, and is easier to assemble in the battery cell.

[0092] In some embodiments, as shown in Figures 5A and 5B , the sheet portion 51 of the transition member 500 for connecting to the tab, such as the third sheet portion 513, includes a main body region 5130 and a welding region 5131. The main body region 5130 has a thickness of T1, and the thinned region 520 of the bent portion 52 (e.g., the second bent portion 522 in the figure) connected to the main body region 5130 has a thickness of T2, where T1 / 4 ≤ T2 ≤ 0.6 mm. This allows for the transition member 500 to meet its internal resistance design requirements, structural strength requirements, and ease of implementation and precision requirements of the molding process.

[0093] In some embodiments, the maximum thickness T1 of the transition member 500 is no less than 0.3 mm and no greater than 2 mm. The thickness of the sheet portion 51 can be designed within this range to meet structural strength requirements and internal resistance design requirements. For example, in some embodiments, the maximum thickness T1 of the transition member 500 can be designed to be 0.4 mm, 0.6 mm, 0.8 mm, 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, or 2 mm.

[0094] In some embodiments, the thickness T2 of the thinned region is not less than 0.1 mm and not greater than 0.6 mm. The thickness of the thinned region 520 can be designed within this range to facilitate bending of the bending portion 52, thereby achieving higher forming accuracy. For example, in some embodiments, the thickness T2 of the thinned region 520 can be designed to be 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, or 0.6 mm.

[0095] As shown in Figures 5A and 5B, in some embodiments of the present application, the width of the bent portion 52 is equal to the width of the corresponding thinning area 520. Designing the width of the thinning area 520 to be as large as possible can make the bent portion 52 easier to bend.

[0096] In some embodiments of the present application, the minimum gap size between two adjacent sheet parts 51 is H, and the width of the bent portion 52 connecting the two adjacent sheet parts 51 is L, wherein 3.14×H / 2≤L≤3.14×H.

[0097] As shown in FIG4B , in this embodiment, H1 represents the minimum gap size between the first sheet portion 511 and the second sheet portion 512, and H2 represents the minimum gap size between the second sheet portion 512 and the third sheet portion 513. As shown in FIG5B , L1 represents the width of the first bent portion 521 between the first sheet portion 511 and the second sheet portion 512, and L2 represents the width of the first bent portion 522 between the second sheet portion 512 and the third sheet portion 513.

[0098] The above H1, H2, L1, and L2 satisfy the following relationship: 3.14×H1 / 2≤L1≤3.14×H1, 3.14×H2 / 2≤L2≤3.14×H2. This embodiment allows the bent portion 52 to have an appropriate bending radius, thereby facilitating molding and reducing the internal resistance of the transition member.

[0099] Proper design of the gap size H and the width L of the bent portion 52 can make the bent portion 52 have an appropriate bending radius, thereby facilitating molding and helping to reduce the internal resistance of the transition component 500 .

[0100] In some embodiments, the width of each bent portion 52 is no less than 1 mm and no more than 10 mm, which allows the bent portion 52 to have an appropriate bending radius, thereby facilitating molding. For example, in some embodiments, depending on the specifications of the adapter member 500, the width of the bent portion 52 can be designed to be 1 mm, 3 mm, 5 mm, 7 mm, or 10 mm.

[0101] In the embodiment of the present application, the width of the thinning area 520 may be the bottom width of the thinning groove 53 , and the thickness of the thinning area 520 may be the thickness of the area corresponding to the bottom of the thinning groove 53 .

[0102] The widths of the bent portions 52 (e.g., L1, L2) can be the same or different, depending on the corresponding minimum gap dimensions (e.g., H1, H2). In some embodiments, the width of the bent portion 52 is equal to the width of the corresponding thinning region 520, that is, the bottom width of the thinning groove 53. Furthermore, the width of the bent portion 52 is no less than 1 mm and no more than 10 mm. This ensures that the bent portion 52 has an appropriate bending radius, facilitates molding, and helps reduce the internal resistance of the transition member 500.

[0103] As shown in Figures 4A and 4B, some embodiments of the present application provide a transition member 500 comprising a first sheet portion 511, a first bent portion 521, a second sheet portion 512, a second bent portion 522, and a third sheet portion 513, which are sequentially connected. The first bent portion 521 and the second bent portion 522 have opposite bending directions. The first sheet portion 511 is used for welding to the electrode terminal of a battery cell, while the third sheet portion 513 is used for welding to the tab of a battery cell. The first sheet portion 511 is provided with a through-hole 56 for assembly with the electrode terminal and has a positioning notch 57 on its edge. The third sheet portion 513 includes a main body region 5130 and a welding region 5131, and is provided with a positioning hole 58 for welding positioning. The welding region 5131 is thinner than the main body region 5130 and has at least one welding groove 55 that is raised away from the second sheet portion 512. The thickness of the main region 5130 of the third sheet-shaped portion 513 is T1, and the thickness of the thinned region 520 is T2, wherein T1 / 4≤T2≤0.6 mm.

[0104] As shown in Figures 4B and 5B , the maximum thickness of the transition member 500 is T1. The entire first bend portion 521 and the second bend portion 522 are thinned, with the thickness of the thinned region 520 being T2. In some embodiments, T1 / 4 ≤ T2 ≤ 0.6 mm. The thickness can be designed within the following range: T1 / 3 ≤ T2 ≤ 0.4 mm.

[0105] As shown in Figures 4B and 5B, the minimum gap dimension H1 between the first sheet portion 511 and the second sheet portion 512 and the width L1 of the first bent portion 521 satisfy the following relationship: 3.14×H1 / 2≤L1≤3.14×H1. The minimum gap dimension H2 between the second sheet portion 512 and the third sheet portion 513 and the width L2 of the second bent portion 522 satisfy the following relationship: 3.14×H2 / 2≤L2≤3.14×H2.

[0106] The adapter component 500 designed in the above embodiment of the present application is easy to form at the bend, and the bending position is relatively accurate and the forming precision is high, thereby improving the performance and quality of the battery.

[0107] As shown in FIG6 , according to some embodiments of the present application, an electrical device 2000 is provided, comprising a battery 100 according to any of the aforementioned embodiments, wherein the battery 100 includes a plurality of battery cells 10 according to the aforementioned embodiments. The electrical device 2000 can be any device requiring a battery 100, and the performance and quality of the battery 100 can be improved accordingly based on the design of the adapter member 500 of the battery cell 10.

[0108] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A transition member for a battery cell, the transition member being in a folded curved shape, comprising a plurality of sheet-like portions and at least one bent portion connecting the plurality of sheet-like portions, at least one of the bent portions being provided with a thinned region.

2. The transition member according to claim 1, wherein: The plurality of sheet parts include a first sheet part and a second sheet part, the at least one bent part includes a first bent part, the first sheet part, the first bent part and the second sheet part are connected in sequence, wherein, The first sheet-shaped portion is used to connect to the electrode terminal of the battery cell, and the second sheet-shaped portion is used to connect to the tab of the battery cell.

3. The transition member according to claim 1, wherein: The plurality of sheet parts include a first sheet part, a second sheet part and a third sheet part, the at least one bent part includes a first bent part and a second bent part, the first sheet part, the first bent part, the second sheet part, the second bent part and the third sheet part are connected in sequence, wherein, The first bent portion and the second bent portion have opposite bending directions. The first sheet portion is used to be connected to the electrode terminal of the battery cell, and the third sheet portion is used to be connected to the tab of the battery cell.

4. The transition member according to claim 3, wherein: The thinning area is provided on both the first bending portion and the second bending portion.

5. The transition member according to any one of claims 1 to 4, wherein: The maximum thickness of the transition component is T1, and the thickness of each thinning area is T2, wherein T1 / 4≤T2≤0.6 mm, preferably, T1 / 3≤T2≤0.4 mm.

6. The transition member according to any one of claims 1 to 5, wherein: The maximum thickness of the transition component is not less than 0.3 mm and not more than 2 mm.

7. The transition member according to any one of claims 1 to 6, wherein: The thickness of the thinned area is not less than 0.1 mm and not more than 0.6 mm.

8. The transition member according to any one of claims 1 to 7, wherein: The width of one of the bent portions is equal to the width of the corresponding thinning area arranged thereon.

9. The transition member according to any one of claims 1 to 8, wherein: The minimum gap size between two adjacent sheet-like parts is H, and the width of the bent portion connecting two adjacent sheet-like parts is L, wherein 3.14×H / 2≤L≤3.14×H.

10. The transition member according to claim 8 or 9, wherein: The width of each bent portion is not less than 1 mm and not more than 10 mm.

11. The transition member according to any one of claims 1 to 10, wherein: Each of the bent portions forms a thinning groove on one side or both sides of the thinning area.

12. The transition member according to claim 11, wherein: The sidewalls of the thinning groove are inclined away from the center of the groove.

13. The transition member according to any one of claims 1 to 12, wherein: One of the multiple sheet-like parts is used to be welded to the tab of the battery cell, and the one of the sheet-like parts includes a main body area and a welding area, wherein the bent part is connected to the main body area, the thickness of the main body area is T1, and the thickness of the thinning area is T2, wherein T1 / 4≤T2≤0.6 mm.

14. The transition member according to claim 13, wherein: The welding area has at least one welding groove raised away from the adjacent sheet-shaped portion.

15. A battery cell comprising: A housing having a receiving cavity; an end cover connected to the housing to close the accommodating cavity; A battery cell assembly is disposed in the accommodating cavity and has a tab; an electrode terminal, disposed on the end cap; as well as The transition member according to any one of claims 1 to 14, wherein the transition member connects the tab and the electrode terminal.

16. The battery cell according to claim 15, wherein: The battery cell assembly is a wound battery cell assembly, and the battery cell includes a cylindrical shell and a positive end cap and a negative end cap, wherein the positive end cap is covered on one end of the shell, and the negative end cap is covered on the other end of the shell.

17. A battery comprising: A plurality of battery cells according to claim 15 or 16 are combined in series and / or parallel.

18. An electrical device comprising the battery cell according to claim 15 or 16.

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