WO2024026861A1

WO2024026861A1 - Adapter member, battery cell, battery, and electric device

Info

Publication number: WO2024026861A1
Application number: PCT/CN2022/110665
Authority: WO
Inventors: 苏华圣; 邢承友; 李全坤; 徐春光; 王鹏; 金海族
Original assignee: 宁德时代新能源科技股份有限公司
Priority date: 2022-08-05
Filing date: 2022-08-05
Publication date: 2024-02-08

Abstract

Provided are an adapter member, a battery cell, a battery and an electric device. The adapter member is used in a battery cell, is in a folded and curved shape, and comprises a plurality of sheet-like portions and at least one bent portion that connects the plurality of sheet-like portions with each other, wherein the at least one bent portion is provided with a thinned region.

Description

Adapter components, battery cells, batteries and electrical devices

Technical field

The present application relates to the field of battery technology, and in particular to an adapter component, a battery cell, a battery and an electrical device.

Background technique

In the related art, a battery includes a plurality of battery cells combined in series and/or parallel. A battery cell is the smallest unit in a battery that provides an energy source. Its electrode terminals are generally electrically connected to the tabs of the cell assembly located in its housing through an adapter member, so that the electric energy of the battery cell can be output or input to the battery cell. electrical energy.

Contents of the invention

This application aims to solve at least one of the technical problems existing in the related art. To this end, one purpose of this application is to provide an adapter component, a battery cell, a battery and an electrical device.

An embodiment of the first aspect of the present application provides an adapter member for a battery cell. The adapter member is in a folded and curved shape and includes a plurality of sheet portions and at least one bent portion connecting the plurality of sheet portions. , at least one of the bent portions is provided with a thinned area.

The adapter member in the embodiment of the present application is provided with a thinned area in at least one bending part. The thinned area is smaller than the maximum thickness of other areas of the adapter member. This design makes it easier to bend the adapter member during processing. The bending position is more accurate and the molding accuracy is high, so the performance and quality of the battery cells and batteries can be improved.

In some embodiments, the plurality of sheet portions include a first sheet portion and a second sheet portion, at least one bending portion includes a first bending portion, the first sheet portion, the first bending portion, and the second bending portion. The sheet-shaped parts are connected in sequence, wherein the first sheet-shaped part is used to connect to the electrode terminal of the battery cell, and the second sheet-shaped part is used to connect to the tab of the battery cell. The shape of the adapter component can be flexibly designed according to actual needs.

In some embodiments, the plurality of sheet portions include a first sheet portion, a second sheet portion, and a third sheet portion, at least one bent portion includes a first bent portion and a second bent portion, and the first The sheet-shaped part, the first bending part, the second sheet-shaped part, the second bending part and the third sheet-shaped part are connected in sequence, wherein the bending directions of the first bending part and the second bending part are opposite, and the bending directions of the first bending part and the second bending part are opposite. The one piece-shaped part is used for connecting with the electrode terminal of the battery cell, and the third piece-shaped part is used for connecting with the pole lug of the battery cell. The adapter component is generally bent in a Z-shape as a whole, which can better adapt to the internal space of the battery cell.

In some embodiments, thinned areas are provided on both the first bending portion and the second bending portion. This makes it easier to bend the transfer component during processing, and the molding accuracy is higher.

In some embodiments, the maximum thickness of the adapter member is T ₁ and the thickness of each thinned area is T ₂ , where T ₁ /4≤T ₂ ≤0.6 mm, preferably, T ₁ /3≤T ₂ ≤ 0.4 mm. In this way, the internal resistance design requirements, structural strength requirements, ease of implementation and accuracy requirements of the molding process of the transfer component can be taken into consideration. When T ₁ /3 ≤ _{T 2} ≤ 0.4 mm, the adapter component is easier to bend, higher molding accuracy can be obtained, and it is easier to assemble into the battery cell.

In some embodiments, the maximum thickness of the adapter member is no less than 0.3 mm and no more than 2 mm. Design the thickness of the sheet part with reference to this range, which can meet the structural strength requirements and internal resistance design requirements.

In some embodiments, the thickness of the thinned region is no less than 0.1 mm and no more than 0.6 mm. The thickness of the thinned area is designed with reference to this range, so that the bending part can be easily bent and higher molding accuracy can be obtained.

In some embodiments, the width of a bent portion is equal to the width of a corresponding thinned area thereon. The width of the thinned area is designed to be as large as possible to make the bending part easier to bend.

In some embodiments, 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, where 3.14×H/2≤L≤ 3.14×H. This embodiment can make the bending part have an appropriate bending radius, thereby making it easy to form and conducive to reducing the internal resistance of the adapter member.

In some embodiments, the width of each bent portion is no less than 1 mm and no more than 10 mm. In this way, the bent part can be at an appropriate bending radius, making it easy to form.

In some embodiments, each bent portion forms a thinned groove on one or both sides of the thinned area. The thinning groove can be formed using appropriate processes according to actual needs.

In some embodiments, the sidewalls of the thinned groove are tapered away from the center of the groove, thereby making machining easier.

In some embodiments, one of the plurality of sheet-shaped portions is used for welding with the tab of the battery cell, and one of the sheet-shaped portions includes a main body area and a welding area, wherein the bent portion is connected to the main body. area, the thickness of the main area is T1, and the thickness of the thinned area is T2, where T1/4≤T2≤0.6 mm. In this way, it can not only meet the structural strength required in the main body area, but also make the bending part easier to bend.

In some embodiments, the welding zone has at least one welding groove raised away from an adjacent tab portion. The design of the welding groove can not only improve the structural strength, but also increase the reliability of the welding contact between the adapter component and the tab, making the connection more reliable, thereby improving the performance and service life of the battery cell.

The embodiment of the second aspect of the present application provides a battery cell, including: a casing having an accommodation cavity; an end cover connected to the casing to close the accommodation cavity; and a battery core assembly disposed in the accommodation cavity and having tabs ; The electrode terminal is provided on the end cover; and the adapter member of any of the aforementioned embodiments, wherein the adapter member connects the tab and the electrode terminal.

In some embodiments, the battery cell assembly is a wound battery cell assembly, and the battery cell includes a cylindrical casing and a positive terminal cover and a negative terminal cover, wherein the positive terminal cover is closed on one end of the casing, and the negative terminal cover is The extreme cover fits over the other end of the housing.

The above-mentioned adapter components of the battery cells are easy to form at the bends, and the bending positions are relatively accurate and the molding precision is high. Therefore, the performance and quality of the battery cells are improved.

An embodiment of the third aspect of the present application provides a battery including a plurality of battery cells of the aforementioned aspects combined in series and/or parallel. Based on the above design of the battery cell's adapter component, the battery can achieve corresponding technical effects, and its performance and quality can be improved accordingly.

An embodiment of the fourth aspect of the present application provides an electrical device, including the battery cell of the aforementioned aspect. The battery performance and quality of the electrical device can be improved accordingly based on the aforementioned design of the adapter component in the battery cell.

The above description is only an overview of the technical solutions of the present application. In order to have a clearer understanding of the technical means of the present application, they can be implemented according to the content of the description, and in order to make the above and other purposes, features and advantages of the present application more obvious and understandable. , the specific implementation methods of the present application are specifically listed below.

Description of drawings

In the drawings, unless otherwise specified, the same reference numbers refer to the same or similar parts or elements throughout the several figures. The drawings are not necessarily to scale. It should be understood that these drawings depict only some embodiments disclosed in accordance with the present application and should not be considered as limiting the scope of the present application.

Figure 1 is a schematic structural diagram of a vehicle according to some embodiments of the present application;

Figure 2A is a schematic diagram of the disassembled structure of a battery according to some embodiments of the present application;

Figure 2B is a schematic diagram of the disassembled structure of the battery according to some embodiments of the present application;

Figure 3A is a schematic diagram of the disassembled structure of a battery cell according to some embodiments of the present application;

Figure 3B is a schematic three-dimensional structural diagram of the positive terminal cover of a battery cell according to some embodiments of the present application;

Figure 3C is a schematic cross-sectional structural diagram cut along the A-A direction in Figure 3B;

Figure 4A is a schematic three-dimensional structural diagram of an adapter component according to some embodiments of the present application;

Figure 4B is a schematic cross-sectional structural diagram cut along the B-B direction in Figure 4A;

Figure 5A is a schematic three-dimensional structural diagram of the adapter member in a flattened state according to some embodiments of the present application;

Figure 5B is a schematic cross-sectional structural diagram cut along the C-C direction in Figure 5A;

Figure 5C is a schematic three-dimensional structural diagram of the adapter member in a flattened state according to other embodiments of the present application; and

Figure 6 is a structural block diagram of an electrical device according to some embodiments of the present application.

Explanation of reference symbols:

1000-vehicle; 100-battery; 200-controller; 300-motor; 120-box; 10-battery cell;

121-first part; 122-second part; 1200-battery module; 1201-fixed shell; 110-casing;

102-positive terminal cover; 103-negative terminal cover; 107-negative pole lug; 101-battery core assembly; 106a-positive electrode terminal;

106b-negative electrode terminal; 104-liquid injection hole; 105-pressure relief mechanism; 500-transfer member;

500a-positive electrode adapter member; 51-sheet part; 511-first sheet part; 512-second sheet part;

513-The third sheet part; 52-The bending part; 521-The first bending part; 522-The second bending part;

520-Thinning area; 53-Thinning groove; 5130-Main area; 5131-Welding area; 55-Welding groove; 56-Perforation;

57-positioning notch; 58-positioning hole 58; 2000-electrical device.

Detailed ways

The embodiments of the technical solution of the present application will be described in detail below with reference to the accompanying drawings. The following examples are only used to illustrate the technical solution of the present application more clearly, and are therefore only used as examples and cannot be used to limit the protection scope of the present application.

Unless otherwise defined, all technical and scientific terms used herein have the same meanings as commonly understood by those skilled in the technical field belonging to this application; the terms used herein are for the purpose of describing specific embodiments only and are not intended to be used in Limitation of this application; the terms "including" and "having" and any variations thereof in the description and claims of this application and the above description of the drawings are intended to cover non-exclusive inclusion.

In the description of the embodiments of this application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying the relative importance or implicitly indicating the quantity or specificity of the indicated technical features. Sequence or priority relationship. In the description of the embodiments of this application, "plurality" means two or more, unless otherwise explicitly and specifically limited.

Reference herein to "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The appearances of this phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those skilled in the art understand, both explicitly and implicitly, that the embodiments described herein may be combined with other embodiments.

In the description of the embodiments of this application, the term "and/or" is only an association relationship describing associated objects, indicating that there can be three relationships, such as A and/or B, which can mean: A exists alone, and A exists simultaneously and B, there are three cases of B alone. In addition, the character "/" in this article generally indicates that the related objects are an "or" relationship.

In the description of the embodiments of this application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to It is more than two pieces (including two pieces).

In the description of the embodiments of this application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back" , "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inside", "Outside", "Clockwise", "Counterclockwise", "Axis", " The orientations or positional relationships indicated by "radial", "circumferential", etc. are based on the orientations or positional relationships shown in the drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and are not intended to indicate or imply the devices or devices referred to. Elements must have a specific orientation, be constructed and operate in a specific orientation, and therefore are not to be construed as limitations on the embodiments of the present application.

In the description of the embodiments of this application, unless otherwise explicitly stated and limited, technical terms such as "installation", "connection", "connection", and "fixing" should be understood in a broad sense. For example, it can be a fixed connection or a fixed connection. It can be detachably connected or integrated; it can also be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediate medium; it can be the internal connection of two elements or the interaction between two elements. . For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of this application can be understood according to specific circumstances.

The electrode terminals of the battery cells are generally electrically connected to the tabs of the battery cell components through adapter members, so that the electric energy of the battery cells can be output or electric energy can be input to the battery cells. With the development trend of increasing battery power, the thickness of the sheet material of the adapter component is also designed to increase accordingly. In some application scenarios, the adapter component needs to be designed in a bent shape. Due to the large thickness of the sheet material of the adapter component, the bending process is difficult and it is difficult to meet the molding accuracy requirements.

Based on the above considerations, the inventor has conducted in-depth research and provided a transfer member, a battery cell, a battery and an electrical device. The transfer member is easy to form at the bending point, and the bending position is relatively accurate, and the forming accuracy is high. , thereby improving the performance and quality of battery cells and batteries.

The battery cells disclosed in the embodiments of this application can be applied to power batteries or energy storage batteries. Among them, the application scenarios of power batteries include but are not limited to vehicles, ships, aircraft, spacecraft, electric tools, electric toys, various mobile terminals, etc. The application scenarios of energy storage batteries include but are not limited to solar power generation systems, hydroelectric power generation systems, wind power generation systems, etc.

As shown in Figure 1, a schematic structural diagram of a vehicle 1000 is provided for some embodiments of the present application. The specific type of the vehicle 1000 is not limited, for example, it is a new energy electric vehicle, which includes a battery 100, a controller 200 and a motor 300. The battery 100 can supply power to various electrical modules of the entire vehicle, such as the controller 200, the motor 300, the control system and the air conditioner (not shown in the figure).

As shown in FIG. 2A , a schematic structural diagram of a battery 100 is provided for some embodiments of the present application. The battery 100 includes a box 120 and a plurality of battery cells 10 located in the box 120 . The box 120 provides an accommodation space for the battery cells 10. The box 120 may include a first part 121 and a second part 122. The first part 121 and the second part 122 cover each other, and the first part 121 and the second part 122 jointly define a receiving space. In the battery 100 , multiple battery cells 10 can be connected in series, in parallel, or in mixed connection. Mixed connection means that the connection modes of the multiple battery cells 10 are both series and parallel. When the battery 100 is assembled, multiple battery cells 10 may be connected together in series, parallel, or mixed connection, and then the multiple battery cells 10 may be placed in the box 120 as a whole.

As shown in FIG. 2B , a battery 100 provided by other embodiments of the present application includes a box 120 and a plurality of battery modules 1200 located in the box 120 . The box 120 may include a first part 121 and a second part 122, and the first part 121 and the second part 122 jointly define a receiving space. Each battery module 1200 includes a fixed case 1201 and a plurality of battery cells 10 located in the fixed case 1201 and combined in series, parallel or mixed connection. In addition, the battery 100 may also include a bus component (not shown in the figure) for realizing electrical connection between multiple battery modules 1200 .

As shown in Figures 3A, 3B, and 3C, the battery cell 10 provided in some embodiments of the present application includes a housing 110 with a receiving cavity, an end cover (such as a positive terminal cover 102 and a negative terminal) connected to the housing 110. cover 103), a cell assembly 101 disposed in the casing 110 and having tabs (such as the negative tab 107 and the positive tab not shown in the figure due to perspective reasons), and electrode terminals (such as the positive electrode) arranged on the end cover. electrode terminal 106a and negative electrode terminal 106b), and the adapter member 500 provided by some of the following embodiments of the application (such as the positive electrode adapter member 500a and the negative electrode adapter member not shown in the figure due to perspective reasons, the positive electrode adapter member and The negative electrode adapter component can adopt the same structural design). In addition, the battery cell 10 typically also includes an electrolyte located in the case 110 (not shown in the figure).

The positive adapter member 500a can be connected (eg, welded or riveted) to the positive electrode terminal 106a and the positive electrode tab, and the negative electrode adapter member can be connected (eg, welded or riveted) to the negative electrode terminal 106b and the negative electrode tab 107 to form an electrode terminal. electrical connection with the corresponding tab. The positive electrode terminal 106 a and the negative electrode terminal 106 b are used to connect with an external conductive structure to output electric energy from the battery cell 10 or input electric energy to the battery cell 10 . In addition, the series connection, parallel connection or mixed connection of multiple battery cells 10 can be realized through the positive electrode terminal 106 a and the negative electrode terminal 106 b of the multiple battery cells 10 and external circuit design.

As shown in Figures 3A, 3B and 3C, in some embodiments, the battery core assembly 101 is a wound battery core assembly, and the casing is cylindrical (such as cylindrical, square or flat cylindrical, etc.) , the positive terminal cover 102 is closed on one end of the housing 110, the negative terminal cover 103 is closed on the other end of the housing 110, the positive electrode terminal 106a is provided on the positive terminal cover 102 (as shown in Figure 3B), and the negative electrode terminal 106b Provided on the negative terminal cover 103 (as shown in FIG. 3A). Protruding structures may be respectively provided on the positive terminal cover 102 and the negative terminal cover 103, and the positive electrode terminals 106a (for example, the two positive electrode terminals 106a in the figure) and the negative electrode terminals 106b (for example, the two negative electrode terminals 106b in the figure) are embedded respectively. in the corresponding convex structure. In addition, the positive terminal cover 102 and/or the negative terminal cover 103 may be provided with an injection hole 104 for injecting electrolyte, and the positive terminal cover 102 and/or the negative terminal cover 103 may also be provided with a pressure relief mechanism 105, such as an explosion-proof valve. .

In this embodiment, the cell assembly 101 is mainly formed by winding positive electrode pieces and negative electrode pieces (not shown in the figure), and a separator (not shown in the figure) is provided between the positive electrode piece and the negative electrode piece. ). The portions of the positive electrode piece and the negative electrode piece that are provided with active material each serve as their main body, and the portions of the positive electrode piece and the negative electrode piece that are not provided with active material constitute the positive electrode tab and the negative electrode tab 107 respectively. 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 respectively to form a flat shape.

The adapter member provided by the embodiment of the present application is used for battery cells (such as the battery cell 10 shown in Figure 3A). The adapter member is in a folded and curved shape as a whole, including multiple sheet-like parts and connecting the multiple sheet-like parts. At least one bent portion, wherein at least one bent portion is provided with a thinned area. The design of the adapter component makes it easier to bend during processing, the bending position is more accurate, and the molding precision is high, which can improve the performance and quality of the battery cells and batteries.

As shown in Figures 4A, 4B, 5A and 5B, Figure 4A is a schematic three-dimensional structural view of the adapter member in some embodiments of the present application, and Figure 4B is a schematic cross-sectional structural view cut along the B-B direction in Figure 4A. Figure 5A is a schematic three-dimensional structural diagram of the adapter member in a flattened state according to some embodiments of the present application, and Figure 5B is a schematic cross-sectional structural diagram cut along the C-C direction in Figure 5A.

The adapter member 500 for a battery cell provided in the embodiment of the present application has a folded and curved shape as a whole, and includes 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 thinned area 520 .

The adapter member 500 may be machined from sheet metal. In the embodiment of the present application, the overall shape of the sheet portion 51 is substantially flat, and the bending portion 52 is bent relative to the sheet portion 51 , so that the entire adapter member 500 exhibits a folded and curved shape. The adapter member 500 has a folded and curved shape as a whole, which can better adapt to the internal space of the battery cell. The adapter member 500 is connected to the electrode terminals and the tabs of the cell assembly inside the battery cell respectively (for example, by welding or riveting), and can play a good conductive connection role.

The thinned area 520 of the bent portion 52 has undergone a thinning process, so that the thickness is smaller than the maximum thickness of other areas of the adapter member 500 . On the premise that the thinned area 520 is designed to be thinned, the areas of each sheet portion 51 and the bent portion 52 other than the thinned area 520 can have a consistent thickness. In addition, some of the sheet portions 51 may also be thinned in local areas.

In the embodiment of the present application, "thickness" is defined as the thickness of a certain part or area of the plate material of the adapter member 500, rather than the thickness caused by its overall structural shape.

The adapter member 500 in the embodiment of the present application is provided with a thinned area 520 in at least one bending portion 52 , and the maximum thickness of the thinned area 520 is smaller than that of other areas of the adapter member 500 . Compared with the adapter component without thinning design in the related art, the adapter component 500 provided by the embodiment of the present application is easier to bend during processing, and the bending position is more accurate and the molding precision is higher, so it can improve the battery cell performance. performance and quality of the body and battery.

In the embodiment of the present application, the thinning process of the thinned area 520 can be achieved by using at least one machining process such as forging, stamping, upsetting, and material removal. Thinning can be performed on any side surface of the thinned area 520 to obtain a desired thickness. It is also possible to perform thinning processing on one side of the thinning area 520 first, and then continue to perform thinning processing on the other side surface of the thinning area 520 to finally obtain the desired thickness.

As shown in FIGS. 5A, 5B and 5C, due to the thinning process in the thinning area 520, the bent part 52 forms a thinning groove 53 in the thinning area 520. In this embodiment, the thinning groove 53 is formed. formed on one side of the thinned area 520 . The design of the thinned groove 53 can make the thinned area 520 obtain a relatively small thickness, thereby making it easier to bend the adapter member 500 during processing, and the bending position is more accurate.

As shown in FIG. 5C , in this embodiment, the thinned groove 53 may also be formed on the other side of the thinned area 520 . In addition, thinning grooves 53 may also be formed on both sides of the thinning area 520 . The thinning groove 53 can be flexibly designed according to process and design requirements.

As shown in FIG. 5B , the side walls of the thinned groove 43 are inclined away from the center of the groove, thereby forming a chamfer structure, making processing easier.

As shown in FIG. 5B , in the embodiment of the present application, the width of the bent portion 52 is defined as the size of the relatively small narrow edge of the bent portion 52 when it is in a flattened state. That is to say, the width of the bent portion 52 is The width 52 is the size of the bent portion 52 in the length direction of the adapter member 500 when the adapter member 500 is in a flat state.

The width of the thinned area 520 is defined as the width of the bottom surface of the thinned groove 53 formed in the thinned area 520 when the adapter member 500 is in a flat state. As shown in FIG. 5B , the width of the bent portion 52 may be equal to the width of the corresponding thinned area 520 provided thereon. That is, the entire bent portion 52 is thinned to a thickness smaller than the maximum thickness of other portions of the adapter member 500 .

In some embodiments, the width of the bent portion 52 can also be greater than the width of the corresponding thinned area 520 provided thereon, that is, only a partial area of the bent portion 52 is thinned, so that easy and flexible bending can still be achieved. The technical effect of more accurate bending position.

The folded and bent shape of the adapter member 500 is not limited, and it includes a plurality of sheet portions 51 and at least one bent portion 52 . In some embodiments, as shown in FIGS. 4A and 4B , the plurality of sheet portions 51 include a first sheet portion 511 , a second sheet portion 512 and a third sheet portion 513 , and at least one bent portion 52 It includes a first bending part 521 and a second bending part 522, a first sheet part 511, a first bending part 521, a second sheet part 512, a second bending part 522 and a third sheet part 513 in sequence. Connection, wherein the bending directions of the first bending part 521 and the second bending part 522 are opposite, so that the adapter member 500 generally presents a Z-shaped bend as a whole, and the first sheet part 511 is used to connect with the battery cell. The electrode terminal connection can realize the electrical connection between the transfer member 500 and the electrode terminal. The third sheet portion 513 is used to connect with the tab of the battery cell, and can realize the electrical connection between the transfer member 500 and the tab. The transfer member 500 can be made of sheet materials with better electrical conductivity such as aluminum or copper.

In this embodiment, the first bending part 521 and the second bending part 522 are both provided with thinned areas 520, so that the two bending parts of the adapter member 500 can be easily bent during processing, and the forming accuracy is improved. higher.

In other embodiments, the plurality of sheet-shaped portions of the adapter member may further include a first sheet-shaped portion and a second sheet-shaped portion, and at least one bent portion of the adapter member includes a first bent portion, and the first sheet-shaped portion The first sheet-shaped part, the first bent part and the second sheet-shaped part are connected in sequence, wherein the first sheet-shaped part is used to connect to the electrode terminal of the battery cell, and the second sheet-shaped part is used to connect to the tab of the battery cell. . The shape of the adapter component can be flexibly designed as needed.

In some embodiments, the sheet portion 51 of the adapter member 500 for connecting to the electrode terminal, such as the first sheet portion 511 , has a through hole 56 for being assembled with the electrode terminal. When the battery cells are assembled, the electrode terminals are inserted into the through holes 56 and are welded and fixed to the first sheet portion 511 . As shown in FIG. 4A , 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 correspondingly designed positioning structure in the battery cell, thereby improving the installation accuracy of the adapter member 500 and reducing the difficulty of assembly. The through holes 56 and the positioning notches 57 can be formed by a stamping process.

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

As shown in Figure 4A, in some embodiments, the welding area 5131 has at least one welding groove 55 that is raised away from the adjacent sheet portion 51 (ie, 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 cell assembly after being assembled with the cell assembly. The welding groove 55 may be formed by a stamping process. The number and specific structural form of the welding grooves 55 are not limited, and can be in various appropriate shapes, such as V-shaped, cross-shaped, circular, strip-shaped, etc. As shown in FIG. 5A , in this embodiment, the third sheet portion 513 has two V-shaped and symmetrically arranged welding grooves 55 .

The design of the welding groove 55 can not only improve the structural strength, but also increase 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 positioning holes 58 for positioning during welding, which can improve the accuracy of welding assembly.

In some embodiments of the present application, the thickness of the welding area 5131 of the third sheet portion 513 can be designed to be smaller than the thickness of the main area 5130 thereof. Since the welding area 5131 is mainly used for welding with the tabs, designing its thickness to be thinner than the main area 5130 can reduce the welding stress, improve the strength of the welding connection with the tabs, and make the welding more reliable.

In the embodiment of the present application, the specific shape, specifications and dimensions of the adapter member 500 should be designed accordingly in conjunction with the specific specifications and dimensions of the battery cells and related components.

As shown in Figure 5B, in some embodiments, the maximum thickness of the adapter member 500 is T ₁ and the thickness of each thinned area 520 is T ₂ , where T ₁ /4 ≤ _{T 2} ≤ 0.6 mm, preferably, T ₁ /3≤T ₂ ≤0.4 mm.

In this embodiment, the maximum thickness of each sheet-like portion 51 may be T ₁ , and the thickness of each thinned region 520 may be T ₂ . Designing an appropriate thickness for the thinned area 520 can take into account the internal resistance design requirements, structural strength requirements, ease of implementation and accuracy requirements of the molding process of the transfer member 500 .

After extensive experiments, the inventor of the present application concluded that when T ₁ /3 ≤ T ₂ ≤ 0.4 mm, the adapter member 500 is easier to bend, and higher molding accuracy can be obtained. It is also suitable for battery cells. Easier to fit into place.

In some embodiments, as shown in FIGS. 5A and 5B , the sheet portion 51 of the adapter member 500 for connecting to the tab, such as the third sheet portion 513 , includes a body area 5130 and a welding area 5131 , where , the thickness of the main body area 5130 is T ₁ , and the thickness of the thinned area 520 of the bent portion 52 (the second bent portion 522 in the figure) connected to the main body area 5130 is T ₂ , where T ₁ /4 ≤T ₂ ≤0.6 mm. In this way, the internal resistance design requirements, structural strength requirements, ease of implementation and accuracy requirements of the molding process of the adapter component 500 can be taken into consideration.

In some embodiments, the maximum thickness T ₁ of the adapter member 500 is no less than 0.3 mm and no more than 2 mm. The thickness of the sheet portion 51 can be designed with reference to this range to meet structural strength requirements and internal resistance design requirements. For example, in some embodiments, the maximum thickness T ₁ of the adapter member 500 may 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.

In some embodiments, the thickness _T2 of the thinned region is no less than 0.1 mm and no more than 0.6 mm. The thickness of the thinned area 520 can be designed with reference to this range, so that the bending portion 52 can be easily bent, thereby achieving higher molding accuracy. For example, in some embodiments, the thickness T ₂ of the thinned region 520 may be designed to be 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, or 0.6 mm.

As shown in FIGS. 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 thinned area 520 provided thereon. Designing the width of the thinned area 520 to be as large as possible can make the bending portion 52 easier to bend.

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

As shown in Figure 4B, in this embodiment, H ₁ represents the minimum gap size between the first sheet portion 511 and the second sheet portion 512, and H ₂ represents the second sheet portion 512 and the third sheet portion. Minimum gap size between 513. As shown in Figure 5B, L ₁ represents the width of the first bending portion 521 located between the first sheet portion 511 and the second sheet portion 512, and L ₂ represents the width of the first bent portion 521 located between the second sheet portion 512 and the third sheet portion. The width of the first bent portion 522 between portions 513 .

The above H ₁ , H ₂ , L ₁ , and L ₂ satisfy: 3.14×H ₁ /2≤L ₁ ≤3.14×H ₁ , 3.14×H ₂ /2≤L ₂ ≤3.14×H ₂ . This embodiment allows the bent portion 52 to be at an appropriate bending radius, thereby making it easy to form and conducive to reducing the internal resistance of the adapter member.

Appropriate design of the gap size H and the width L of the bent portion 52 can make the bent portion 52 at an appropriate bending radius, thereby making it easy to form and conducive to reducing the internal resistance of the adapter member 500 .

In some embodiments, the width of each bending portion 52 is no less than 1 mm and no more than 10 mm, which allows the bending portion 52 to be at an appropriate bending radius, thereby making it easy to form. For example, in some embodiments, the width of the bent portion 52 may be designed to be 1 mm, 3 mm, 5 mm, 7 mm, or 10 mm according to different specifications of the adapter member 500 .

In the embodiment of the present application, the width of the thinned area 520 may be the width of the bottom surface of the thinned groove 53 , and the thickness of the thinned area 520 is the thickness of the area corresponding to the bottom surface of the thinned groove 53 .

The width of each bent portion 52 (eg, L ₁ , L ₂ ) may be the same or different, and is related to its corresponding minimum gap size (eg, H ₁ , H ₂ ). In some embodiments, the width of the bent portion 52 is equal to the width of the corresponding thinned area 520 thereon, that is, the width of the bottom surface of the thinned groove 53 , and the width of the bent portion 52 is not less than 1 mm and not less than 1 mm. It is larger than 10 mm, so that the bending part 52 is at an appropriate bending radius, which is easy to form and helps reduce the internal resistance of the adapter member 500 .

As shown in Figures 4A and 4B, the adapter member 500 provided by some embodiments of the present application includes a first sheet portion 511, a first bent portion 521, a second sheet portion 512, and a second bent portion connected in sequence. part 522 and the third sheet part 513, where the first bending part 521 and the second bending part 522 have opposite bending directions. The first sheet part 511 is used for welding with the electrode terminal of the battery cell, and the third The sheet portion 513 is used for welding with the tabs of the battery cells. 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 the edge. The third sheet portion 513 includes a main body area 5130 and a welding area 5131, and is designed with positioning holes 58 for welding positioning. The thickness of the welding area 5131 is smaller than the thickness of the main body area 5130, and has a bulge facing away from the second sheet portion 512. at least one welding groove 55. The thickness of the main body region 5130 of the third sheet portion 513 is T1, and the thickness of the thinned region 520 is T2, where T1/4≤T2≤0.6 mm.

As shown in Figures 4B and 5B, the maximum thickness of the adapter member 500 is T ₁ . All areas of the first bent portion 521 and the second bent portion 522 are thinned, and the thickness of the thinned area 520 is T ₂ . In some embodiments, T ₁ /4 ≤ T ₂ ≤ 0.6 mm. The thickness design can be carried out with reference to the following range: T ₁ /3 ≤ _{T 2} ≤ 0.4 mm.

As shown in FIGS. 4B and 5B , the minimum gap size H ₁ between the first sheet portion 511 and the second sheet portion 512 and the width L ₁ of the first bent portion 521 satisfy: 3.14×H ₁ / 2≤L ₁ ≤3.14×H ₁ . The minimum gap size H ₂ between the second sheet portion 512 and the third sheet portion 513 and the width L ₂ of the second bent portion 522 satisfy: 3.14×H ₂ /2 ≤ L ₂ ≤ 3.14×H ₂ .

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

As shown in FIG. 6 , according to some embodiments of the present application, an electrical device 2000 is also provided, including the battery 100 of any of the foregoing embodiments. The battery 100 includes a plurality of battery cells 10 of the foregoing embodiments. The electrical device 2000 can be any device that needs to use the 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 .

Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present application, but not to limit it; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The technical solutions described in the foregoing embodiments can still be modified, or some or all of the technical features can be equivalently replaced; and these modifications or substitutions do not deviate from the essence of the corresponding technical solutions from the technical solutions of the embodiments of the present application. The scope shall be covered by the claims and description of this application. In particular, as long as there is no structural conflict, the technical features mentioned in the various embodiments can be combined in any way. The application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

An adapter member for a battery cell. The adapter member is in a folded and curved shape and includes a plurality of sheet parts and at least one bending part connecting the plurality of sheet parts. At least one of the bending parts is The curved part is provided with a thinned area.
The adapter member of claim 1, wherein a plurality of said tab portions include a first tab portion and a second tab portion, said at least one bent portion includes a first bent portion, and said second tab portion The one-piece part, the first bent part and the second part are connected in sequence, wherein,

The first sheet-shaped part is used for connecting with the electrode terminal of the battery cell, and the second sheet-shaped part is used for connecting with the tab of the battery cell.
The adapter member of claim 1 , wherein a plurality of the 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. The bending part and the second bending part, the first sheet part, the first bending part, the second sheet part, the second bending part and the third sheet part are connected in sequence ,in,

The first bending part and the second bending part have opposite bending directions, the first sheet-like part is used to connect with the electrode terminal of the battery cell, and the third sheet-like part is used to connect to the electrode terminal of the battery cell. Connected to the tabs of the battery cells.
The adapter member according to claim 3, wherein the thinned area is provided on both the first bent portion and the second bent portion.
The adapter member according to any one of claims 1 to 4, wherein the maximum thickness of the adapter member is T 1 and the thickness of each thinned area is T 2 , wherein T 1 /4≤ T 2 ≤ 0.6 mm, preferably, T 1 /3 ≤ T 2 ≤ 0.4 mm.
The adapter member according to any one of claims 1 to 5, wherein the maximum thickness of the adapter member is not less than 0.3 mm and not more than 2 mm.
The adapter 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 greater than 0.6 mm.
The adapter 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 thinned area provided thereon.
The adapter 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 distance between two adjacent sheet-like parts connected to each other is H. The width of the bent portion is L, where 3.14×H/2≤L≤3.14×H.
The adapter member according to claim 8 or 9, wherein the width of each of the bent portions is no less than 1 mm and no more than 10 mm.
The adapter member according to any one of claims 1 to 10, wherein:

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

The side walls of the thinned groove are inclined away from the center of the groove.
The adapter member according to any one of claims 1 to 12, wherein:

One of the plurality of sheet portions is used for welding with the tab of the battery cell, and one of the sheet portions includes a main body area and a welding area, wherein the bent portion is connected to the The thickness of the main body region is T 1 and the thickness of the thinned region is T 2 , where T 1 /4 ≤ T 2 ≤ 0.6 mm.
13. The adapter member of claim 13, wherein the welding area has at least one welding groove raised away from the adjacent tab portion.
A battery cell including:

A shell with a receiving cavity;

An end cover, connected to the housing to close the accommodation cavity;

A battery core assembly is arranged in the accommodation cavity and has tabs;

Electrode terminals are provided on the end cap; and

The adapter member according to any one of claims 1 to 14, which connects the tab and the electrode terminal.
The battery cell according to claim 15, wherein the battery cell assembly is a rolled cell assembly, and the battery cell includes the cylindrical casing, a positive terminal cover and a negative terminal cover, wherein , the positive terminal cover is closed on one end of the housing, and the negative terminal cover is closed on the other end of the housing.
A battery comprising: a plurality of battery cells according to claim 15 or 16 combined in series and/or parallel.
An electrical device comprising the battery cell according to claim 15 or 16.