Supporting device, welding equipment, battery monomer, battery device and power utilization device

Abstract

The embodiment of the invention provides a supporting device, welding equipment, a battery monomer, a battery device and a power utilization device, the supporting device is used in a welding process of an adapter and an electrode assembly, at least one electrode assembly forms an electrode unit, the electrode unit comprises a main body part, a plurality of first tabs and a plurality of second tabs, the first tab and the second tab are arranged on the same side of the main body part and are opposite in polarity, the thickness of the first tab is smaller than that of the second tab, and the supporting device comprises a supporting piece, a jig assembly and a heightening assembly. The supporting piece is used for supporting and limiting the main body part. The jig assembly comprises a first jig and a second jig. The block-up assembly comprises at least one first block-up piece and at least one second block-up piece, the at least one first block-up piece is arranged above or below the supporting piece, and the at least one second block-up piece is arranged below the first jig. The quality of the electrode assembly can be improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and more specifically, to a supporting device, a welding device, a battery cell, a battery device and an electric device. Background Art

[0002] Battery monomers are widely used in electronic devices, such as mobile phones, laptop computers, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes and electric tools, etc.

[0003] In the development of battery technology, how to improve the quality of electrode components is a research direction in battery technology. Summary of the invention

[0004] The present application provides a supporting device, welding equipment, a battery cell, a battery device and an electrical device, which can improve the quality of an electrode assembly.

[0005] The embodiment of the present application provides a support device for use in the welding process of an adapter and an electrode assembly, wherein at least one electrode assembly forms an electrode unit, the electrode unit includes a main body, a plurality of first pole ears and a plurality of second pole ears, the first pole ears and the second pole ears are arranged on the same side of the main body and have opposite polarities, the thickness of the first pole ear is less than the thickness of the second pole ear, and the support device includes a support member, a fixture assembly and a padding assembly. The support member is used to support and limit the main body. The fixture assembly includes a first fixture and a second fixture, the first fixture is used to support and limit the adapter welded to the first pole ear, and the second fixture is used to support and limit the adapter welded to the second pole ear. The padding assembly includes at least one first padding member and at least one second padding member, at least one first padding member is arranged above or below the support member and is used to pad the main body, and at least one second padding member is arranged below the first fixture and is used to pad the first fixture.

[0006] In the above technical scheme, the support device of this embodiment is provided with a first padding member at the support member and a second padding member at the first fixture. After the support member pads the electrode assembly, the second fixture is not padded. Therefore, after the second pole ear is padded, the distance between its root and the second fixture becomes larger. During welding, the welding length of the second pole ear located on the upper side becomes shorter, and the unwelded part becomes longer. The welding length of the second pole ear located on the lower side becomes longer, and the unwelded part becomes shorter. The second pole ear on the upper side expands downward due to the lengthening, and the second pole ear on the lower side changes from bending upward to bending downward due to the shortening. Therefore, after multiple electrode assemblies are cored, the shapes of multiple second pole ears are approximately C-shaped. After the C-shaped second pole ear is assembled into the shell, it fully utilizes the folded pole ear space in the battery cell, thereby reducing the possibility of the second pole ear extending into the inside of the pole piece, improving the redundancy problem of the second pole ear, reducing the possibility of the main body being bent by the second pole ear and short circuit, improving the quality of the electrode assembly, and improving the reliability of the battery cell. Furthermore, for the first electrode tab, since it is relatively thin, a second spacer is provided to alleviate the phenomenon that its appearance is deteriorated due to the spacer of the main body.

[0007] In some embodiments, the first padding member is detachably connected to the supporting member, and / or the second padding member is detachably connected to the first fixture.

[0008] In the above technical solution, the first pad is set to be detachably connected to the support, so that the first pad can be connected to the support without moving under the premise of convenient installation and disassembly, thereby reducing the possibility that the first pad moves during the welding process and affects the welding. The second pad is set to be detachably connected to the first jig, so that the second pad can be connected to the first jig without moving under the premise of convenient installation and disassembly, thereby reducing the possibility that the second pad moves during the welding process and affects the welding.

[0009] In some embodiments, the total thickness of at least one first padding member located above or below the support member is h1, and the total thickness of at least one second padding member located below the first fixture is h2, and h1 and h2 satisfy: h1≤h2.

[0010] In the above technical solution, since the thickness of the first pole tab is relatively thin, the total height of the first spacer is set to be less than or equal to the total height of the second spacer, which is equivalent to reducing the distance between the root of the first pole tab and the first fixture or keeping the distance unchanged, so that the morphology of the first pole tab will not be deteriorated. When the total height of the first spacer is less than the total height of the second spacer, the shaping morphology of the first pole tab will be better.

[0011] In some embodiments, the first cushioning member and the second cushioning member are both plate-shaped members with a preset thickness.

[0012] In the above technical solution, the first cushioning member and the second cushioning member are configured as plate-like members with a fixed thickness. This makes the use of the member simple and convenient, and the cushioning accuracy is high.

[0013] In some embodiments, the first padding member has a first identification portion, and the first identification portion is used to mark the thickness of the first padding member; and / or the second padding member has a second identification portion, and the second identification portion is used to mark the thickness of the second padding member.

[0014] In the above technical solution, by setting the first identification part and / or the second identification part, the operator can directly obtain the thickness information of the first cushioning member and / or the second cushioning member, especially when the first cushioning member or the second cushioning member has multiple different thicknesses, it is easier to distinguish them.

[0015] In some embodiments, the first cushioning member is provided with a first positioning portion, and the supporting member is provided with a second positioning portion, and the first positioning portion and the second positioning portion are plug-fitted to position the supporting member and the first cushioning member relative to each other.

[0016] In the above technical solution, the first cushioning member and the supporting member are positioned, and after alignment, the next step of connection is facilitated.

[0017] In some embodiments, there are multiple first padding components, and the multiple first padding components are arranged in sequence along the thickness direction of the first padding components, and any two adjacent first padding components are matched in a concave-convex manner.

[0018] In the above technical solution, any two adjacent first padding members are arranged to be concave-convex matched, so that a limiting effect can be formed on the multiple first padding members, so as to facilitate the subsequent fixing of the multiple first padding members on the support member.

[0019] In some embodiments, there are multiple second padding components, and the multiple second padding components are arranged in sequence along the thickness direction of the second padding components, and any two adjacent second padding components are matched in a concave-convex manner.

[0020] In the above technical solution, any two adjacent second padding members are arranged to be concave-convex matched, so that a limiting effect can be formed on the multiple second padding members, so as to facilitate the subsequent fixing of the multiple second padding members on the first fixture or other structures.

[0021] In some embodiments, the support member includes a base, a plurality of first limiting portions and a plurality of second limiting portions, the base is used to support the main body, the first limiting portions and the second limiting portions are both arranged to protrude from the base along a first direction, the plurality of first limiting portions are relatively arranged along the second direction to limit the main body in the second direction, the plurality of second limiting portions are relatively arranged along a third direction to limit the main body in the third direction, the first direction is parallel to the arrangement direction of the support member to the first raising member, the second direction is parallel to the arrangement direction of the first fixture and the second fixture projected on the same plane along the first direction, and the first direction, the second direction and the third direction intersect with each other.

[0022] In the above technical solution, a plurality of first limiting parts limit the main body along the second direction, and a plurality of second limiting parts limit the main body along the third direction, so as to reduce the movement of the main body along the second direction and the third direction during welding. In addition, the first limiting parts and the second limiting parts are arranged to protrude from the base, so that the limiting effect is better.

[0023] In some embodiments, the first fixture is provided with a limiting groove for limiting the adapter, and / or the second fixture is provided with a limiting groove for limiting the adapter.

[0024] In the above technical solution, the limiting groove is used to limit the adapter, which facilitates the placement of the adapter and the welding of the tab.

[0025] In some embodiments, the first pad is located above the support member, and the supporting device also includes a first bottom plate and a second bottom plate, the first bottom plate is located below the second pad, the second bottom plate is located below the second fixture, the first bottom plate and the second bottom plate are both connected to the support member, the first bottom plate, the second pad and the first fixture are connected in sequence, and the second bottom plate is connected to the second fixture.

[0026] In the above technical solution, a first base plate is provided to provide a mounting base for the second padding member, so as to facilitate the determination of the position of the second padding member. A second base plate is provided to provide a mounting base for the second fixture, so as to facilitate the determination of the position of the second fixture.

[0027] In some embodiments, the second padding member is provided with a third positioning portion, the first bottom plate is provided with a fourth positioning portion, and the third positioning portion and the fourth positioning portion are plug-fitted to position the first bottom plate and the second padding member relative to each other.

[0028] In the above technical solution, the second padding member and the first base plate are positioned so that the next step of connection can be facilitated after alignment.

[0029] In a second aspect, an embodiment of the present application further provides a welding device, comprising the above-mentioned supporting device and welding mechanism, the welding mechanism being used to weld together a plurality of first pole tabs and one of the adapters and to weld together a plurality of second pole tabs and another adapter.

[0030] In a third aspect, the embodiment of the present application further provides a battery cell, including a shell, a plurality of electrode assemblies, an adapter assembly and a terminal assembly. The plurality of electrode assemblies are located in the shell, and the plurality of electrode assemblies form two electrode units. The electrode unit includes a main body, a plurality of first pole tabs gathered together, and a plurality of second pole tabs gathered together. The first pole tab and the second pole tab are arranged on the same side of the main body and have opposite polarities. The thickness of the first pole tab is less than the thickness of the second pole tab. The plurality of second pole tabs include an inner pole tab and an outer pole tab. In the thickness direction of the electrode unit, the outer pole tab is closer to the shell than the inner pole tab. The adapter assembly is located in the shell, and the adapter assembly includes a first adapter and a second adapter. The first adapter is welded to the plurality of first pole tabs, and the second adapter is welded to the plurality of second pole tabs. The terminal assembly is arranged in the shell, and the terminal assembly includes a first electrode terminal and a second electrode terminal. The first electrode terminal is connected to the first adapter, and the second electrode terminal is connected to the second adapter. Wherein, the length of the unwelded portion of the inner pole tab is greater than the length of the unwelded portion of the outer pole tab.

[0031] In a fourth aspect, an embodiment of the present application further provides a battery device, comprising the above-mentioned battery cell.

[0032] In a fifth aspect, an embodiment of the present application further provides an electrical device, comprising the above-mentioned battery device, and the battery device is used to provide electrical energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without paying creative work.

[0034] Figure 1 A schematic diagram of a structure of a support device and an electrode assembly provided in some embodiments of the present application;

[0035] Figure 2 Another structural schematic diagram of a support device and an electrode assembly provided in some embodiments of the present application;

[0036] Figure 3 A schematic diagram of a structure of a support device provided in some embodiments of the present application;

[0037] Figure 4 The effect diagram of a battery cell formed without using a supporting device in a welding process provided in some embodiments of the present application;

[0038] Figure 5 The effect diagram of a battery cell formed by using a supporting device in a welding process provided in some embodiments of the present application;

[0039] Figure 6 A schematic diagram of the structure of a support member and a first cushioning member in a support device provided in some embodiments of the present application;

[0040] Figure 7 A schematic diagram of the structure of a plurality of first cushioning members in a supporting device provided in some embodiments of the present application;

[0041] Figure 8 A schematic diagram of the structure of a first base plate and a second cushioning member in a support device provided in some embodiments of the present application;

[0042] Fig. 9 A schematic diagram of the structure of a battery cell provided in some embodiments of the present application;

[0043] Fig.10 A partial structural schematic diagram of a battery cell provided in some embodiments of the present application;

[0044] Fig.11 A schematic diagram of the structure of a battery device provided in some embodiments of the present application;

[0045] Fig.12 A schematic diagram of the structure of a vehicle provided for some embodiments of the present application.

[0046] The reference numerals of the specific embodiments are as follows:

[0047] 100, support device; 200, electrode assembly; 210, main body; 220, first pole ear; 230, second pole ear; 240, inner pole ear; 250, outer pole ear; 300, battery cell; 310, first adapter; 320, second adapter; 330, first electrode terminal; 340, second electrode terminal; 350, housing; 400, electrode unit; 500, battery device; 510, housing; 520, battery cell assembly; 600, vehicle; 610, controller; 620, motor;

[0048] 1. Support member; 11. Second positioning portion; 12. Base; 13. First limiting portion; 14. Second limiting portion;

[0049] 2. Jig component; 21. First jig; 22. Second jig; 23. Limiting slot;

[0050] 3. Heightening assembly; 31. First heightening member; 311. First positioning portion; 32. Second heightening member; 321. Third positioning portion;

[0051] 4. first bottom plate; 41. fourth positioning portion;

[0052] 5. Second base plate;

[0053] X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0054] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0055] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0056] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0057] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0058] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0059] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0060] The term "plurality" used in the present application refers to two or more (including two).

[0061] In the present application, the battery cell may include a lithium-ion secondary battery cell, a lithium-ion primary battery cell, a lithium-sulfur battery cell, a sodium-lithium-ion battery cell, a sodium-ion battery cell or a magnesium-ion battery cell, etc., and the embodiments of the present application do not limit this. The battery cell may be cylindrical, flat, rectangular or other shapes, etc., and the embodiments of the present application do not limit this.

[0062] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly includes a positive electrode sheet, a negative electrode sheet and a separator. A battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. The positive current collector includes a positive coating area and a positive electrode ear connected to the positive coating area. The positive coating area is coated with a positive active material layer, and the positive electrode ear is not coated with a positive active material layer. Taking a lithium-ion battery cell as an example, the material of the positive current collector can be aluminum, and the positive active material layer includes a positive active material. The positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, and the negative electrode active material layer is coated on the surface of the negative electrode current collector; the negative electrode current collector includes a negative electrode coating area and a negative electrode tab connected to the negative electrode coating area, the negative electrode coating area is coated with a negative electrode active material layer, and the negative electrode tab is not coated with a negative electrode active material layer. The material of the negative electrode current collector can be copper, and the negative electrode active material layer includes a negative electrode active material, and the negative electrode active material can be carbon or silicon, etc. The material of the separator can be PP (polypropylene) or PE (polyethylene), etc.

[0063] During the production of battery cells, the copper tab of the electrode assembly needs to be welded to one of the adapters, and the aluminum tab needs to be welded to the other adapter. During this process, since the aluminum tabs are thicker, the overall shape of the multiple aluminum tabs is S-shaped. The S-shaped aluminum tabs are relatively redundant, which can easily deform the top pole piece connected to the aluminum tabs, and even part of the aluminum tabs can easily extend into the pole piece, causing a short circuit in the battery cell.

[0064] In view of this, the present application provides a supporting device, which raises the electrode assembly and the thinner copper pole ear by setting a first pad and a second pad. In this way, the distance between the root of the thicker aluminum pole ear and the adapter plate is increased, thereby achieving the shaping of the appearance of the aluminum pole ear from an S-shape to a C-shape, improving its redundancy problem and improving the quality of the electrode assembly.

[0065] Figure 1 A schematic diagram of a structure of a support device and an electrode assembly provided in some embodiments of the present application; Figure 2 Another structural schematic diagram of a support device and an electrode assembly provided in some embodiments of the present application; Figure 3 A schematic structural diagram of a support device provided in some embodiments of the present application.

[0066] like Figures 1 to 3 As shown, the present application also provides a support device 100 for use in the welding process of the adapter and the electrode assembly 200. At least one electrode assembly 200 forms an electrode unit 400, and the electrode unit 400 includes a main body 210, a plurality of first pole tabs 220, and a plurality of second pole tabs 230. The first pole tab 220 and the second pole tab 230 are arranged on the same side of the main body 210 and have opposite polarities, and the thickness of the first pole tab 220 is less than the thickness of the second pole tab 230. The support device 100 includes a support member 1, a fixture assembly 2, and a padding assembly 3. The support member 1 is used to support and limit the main body 210. The fixture assembly 2 includes a first fixture 21 and a second fixture 22. The first fixture 21 is used to support and limit the adapter welded with the first pole tab 220, and the second fixture 22 is used to support and limit the adapter welded with the second pole tab 230. The raising component 3 includes at least one first raising component 31 and at least one second raising component 32. At least one first raising component 31 is arranged above or below the support component 1 and is used to raise the main body 210. At least one second raising component 32 is arranged below the first fixture 21 and is used to raise the first fixture 21.

[0067] The electrode unit 400 of this embodiment may include one, two or more electrode assemblies 200. All first tabs 220 of the electrode unit 400 are gathered together and welded to one adapter, and all second tabs 230 of the electrode unit 400 are gathered together and welded to another adapter.

[0068] The support member 1 of this embodiment may be a support seat structure, and the support seat structure is provided with a groove for limiting the main body 210 of the electrode assembly 200. The support member 1 limits the main body 210 to reduce the movement of the main body 210 during the welding process.

[0069] The first fixture 21 of this embodiment can be limited by a groove limiting adapter, or by a protruding limiting adapter, or by other structures. The second fixture 22 is also the same, and this application will not repeat it here.

[0070] The first padding member 31 of this embodiment may only abut against the support member 1, or may be connected by a connection means, such as bolt connection. The second padding member 32 of this embodiment may only abut against the first fixture 21, or may be connected by a connection means, such as bolt connection.

[0071] The first padding member 31 of this embodiment may be a plate-shaped structure, a strip-shaped structure or other shapes, and the second padding member 32 is also the same.

[0072] Optionally, the first electrode tab 220 is a copper electrode tab, which is a negative electrode tab, and the second electrode tab 230 is an aluminum electrode tab, which is a positive electrode tab.

[0073] The provision of the first raising member 31 in this embodiment does not affect the limiting effect of the supporting member 1 on the main body 210 .

[0074] In this embodiment, the total thickness of at least one first cushioning member 31 is h1, and the total thickness of at least one second cushioning member 32 is h2. h1 may be greater than, less than or equal to h2.

[0075] The support device 100 of this embodiment is provided with a first padding member 31 at the support member 1 and a second padding member 32 at the first fixture 21. After the support member 1 pads the electrode unit 400, the second fixture 22 is not padded. Therefore, after the second pole ear 230 is padded, the distance between the root and the second fixture 22 becomes larger. During welding, the welding length of the second pole ear 230 located on the upper side becomes shorter, and the unwelded part becomes longer. The welding length of the second pole ear 230 located on the lower side becomes longer, and the unwelded part becomes shorter. Therefore, after the plurality of electrode assemblies 200 are assembled, the second pole ear 230 on the upper side is 0 is the inner pole ear which expands outward due to lengthening, and the second pole ear 230 on the lower side is the outer pole ear which changes from bending inward to bending outward due to shortening, so the shape of the plurality of second pole ears 230 is approximately C-shaped. After being assembled into the shell, the C-shaped second pole ear 230 makes full use of the folded pole ear space in the battery cell, thereby reducing the possibility of the second pole ear 230 extending into the pole piece, improving the redundancy problem of the second pole ear 230, reducing the possibility of the main body 210 being bent by the second pole ear 230 and short-circuiting, improving the quality of the electrode assembly 200, and improving the reliability of the battery cell. In addition, for the first pole ear 220, since it is thin, the second padding member 32 is provided to reduce the phenomenon of its morphology deteriorating due to the padding of the main body 210.

[0076] Figure 4The effect diagram of the battery cell formed in the welding process without using a supporting device is provided in some embodiments of the present application. Figure 5 The effect diagram of a battery cell formed by using a supporting device in a welding process provided in some embodiments of the present application.

[0077] See also Figure 4 and Figure 5 , Figure 4 and Figure 5 The second pole tabs 230 are shown in the figure, wherein the second pole tab 230 located on the inner side is the second pole tab 230 located on the upper side during welding, and the second pole tab 230 located on the outer side is the second pole tab 230 located on the lower side during welding.

[0078] In some embodiments, the first padding member 31 is detachably connected to the supporting member 1 , and / or the second padding member 32 is detachably connected to the first fixture 21 .

[0079] In this embodiment, the first raising member 31 and the supporting member 1 can be detachably connected by bolt connection or plug-in connection.

[0080] In this embodiment, the second raising member 32 and the first fixture 21 can be detachably connected by bolt connection or plug-in connection.

[0081] The first padding member 31 is configured to be detachably connected to the support member 1. Under the premise of convenient installation and disassembly, the first padding member 31 can be connected to the support member 1 without moving, thereby reducing the possibility of the first padding member 31 moving during the welding process and affecting the welding.

[0082] The second padding member 32 is configured to be detachably connected to the first fixture 21. Under the premise of convenient installation and disassembly, the second padding member 32 can be connected to the first fixture 21 without moving, thereby reducing the possibility of the second padding member 32 moving during the welding process and affecting the welding.

[0083] In some embodiments, the total thickness of at least one first pad 31 located above or below the support member 1 is h1, and the total thickness of at least one second pad 32 located below the first fixture 21 is h2, and h1 and h2 satisfy: h1≤h2.

[0084] In this embodiment, the number of the first raising member 31 can be one or more, and the number of the second raising member 32 can be one or more.

[0085] Optionally, h1<h2.

[0086] Since the thickness of the first pole tab 220 is relatively thin, the total height of the first spacer 31 is set to be less than or equal to the total height of the second spacer 32, which is equivalent to reducing the distance between the root of the first pole tab 220 and the first fixture 21 or making the distance unchanged, so that the morphology of the first pole tab 220 will not be deteriorated. When the total height of the first spacer 31 is less than the total height of the second spacer 32, the shaping morphology of the first pole tab 220 will be better.

[0087] In some embodiments, the first cushioning member 31 and the second cushioning member 32 are both plate-shaped members with a preset thickness.

[0088] The preset thickness of the first cushioning member 31 of this embodiment is determined according to the actual usage scenario. For example, the preset thickness is 1 mm, 1.5 mm, 2 mm, 2.5 mm or 3 mm.

[0089] The preset thickness of the second cushioning member 32 of this embodiment is determined according to the actual usage scenario. For example, the preset thickness is 1 mm, 1.5 mm, 2 mm, 2.5 mm or 3 mm.

[0090] The first cushioning member 31 and the second cushioning member 32 are configured as plate-shaped members with a fixed thickness. This makes the use of the cushioning member simple and convenient and also improves the cushioning accuracy.

[0091] In some embodiments, the first padding member 31 has a first identification portion, which is used to mark the thickness of the first padding member 31 ; and / or the second padding member 32 has a second identification portion, which is used to mark the thickness of the second padding member 32 .

[0092] The first identification part of this embodiment can be a sticker pasted on the first padding member 31, or can be formed by physical or chemical etching, or printed, etc. The second identification part can be a sticker pasted on the second padding member 32, or can be formed by physical or chemical etching, or printed, etc.

[0093] By providing the first identification part and / or the second identification part, it is convenient for operators to directly obtain the thickness information of the first cushioning member 31 and / or the second cushioning member 32, especially when the first cushioning member 31 or the second cushioning member 32 has different thicknesses, it is easier to distinguish them.

[0094] Figure 6 A schematic structural diagram of a support member and a first cushioning member in a support device provided in some embodiments of the present application.

[0095] See also Figure 6In some embodiments, the first padding member 31 is provided with a first positioning portion 311, and the support member 1 is provided with a second positioning portion 11. The first positioning portion 311 and the second positioning portion 11 are plugged together to position the support member 1 and the first padding member 31 relative to each other.

[0096] In this embodiment, the first positioning portion 311 and the second positioning portion 11 are plug-fitted. For example, the first positioning portion 311 can be a protrusion or a groove, and the second positioning portion 11 can be a groove or a protrusion. For example, the first positioning portion 311 can be a protrusion or a through hole, and the second positioning portion 11 can be a through hole or a protrusion.

[0097] This arrangement is used to position the first cushioning member 31 and the supporting member 1 , so that the next step of connection is convenient after alignment.

[0098] Figure 7 A schematic structural diagram of multiple first cushioning members in a supporting device provided in some embodiments of the present application.

[0099] See also Figure 7 In some embodiments, there are multiple first padding members 31 , and the multiple first padding members 31 are arranged in sequence along the thickness direction of the first padding members 31 , and any two adjacent first padding members 31 are matched in a concave-convex manner.

[0100] The concave-convex matching of any two adjacent first padding members 31 in the embodiment of the present application means that any two adjacent first padding members 31 are respectively provided with a convex part and a concave part, and the convex part and the concave part are matched with each other. The convex part in this embodiment is a convex structure, and the concave part is a groove or a through hole.

[0101] The number of the first padding members 31 in this embodiment may be two, three or four, etc. When the number of the first padding members 31 is greater than or equal to three, the first padding member 31 in the middle is provided with a convex portion and a concave portion on opposite sides, respectively, and the two first padding members 31 at the edges may only be provided with a convex portion or a concave portion.

[0102] Any two adjacent first padding members 31 are arranged to be concave-convex matched, so that a limiting effect can be formed on the multiple first padding members 31 to facilitate the subsequent fixing of the multiple first padding members 31 on the support member 1.

[0103] In some embodiments, there are multiple second padding members 32 , and the multiple second padding members 32 are arranged in sequence along the thickness direction of the second padding members 32 , and any two adjacent second padding members 32 are matched in a concave-convex manner.

[0104] The concave-convex matching of any two adjacent second padding members 32 in the embodiment of the present application means that any two adjacent second padding members 32 are provided with a convex part and a concave part respectively, and the convex part and the concave part are matched with each other. The convex part in this embodiment is a convex structure, and the concave part is a groove or a through hole.

[0105] The number of the second padding members 32 in this embodiment can be two, three or four, etc. When the number of the second padding members 32 is greater than or equal to three, the second padding member 32 in the middle is provided with a convex portion and a concave portion on opposite sides, respectively, and the two second padding members 32 at the edges can be provided with only a convex portion or a concave portion.

[0106] Any two adjacent second padding members 32 are configured to be concave-convex matched, so that a limiting effect can be formed on the plurality of second padding members 32, so as to facilitate the subsequent fixing of the plurality of second padding members 32 on the first fixture 21 or other structures.

[0107] Please continue to refer to Figure 3 In some embodiments, the support member 1 includes a base 12, a plurality of first limiting portions 13, and a plurality of second limiting portions 14. The base 12 is used to support the main body 210. The first limiting portions 13 and the second limiting portions 14 are both protruding from the base 12 along the first direction X. The plurality of first limiting portions 13 are relatively arranged along the second direction Y to limit the main body 210 in the second direction Y. The plurality of second limiting portions 14 are relatively arranged along the third direction Z to limit the main body 210 in the third direction Z. The first direction X is parallel to the arrangement direction of the support member 1 to the first cushioning member 31. The second direction Y is parallel to the arrangement direction of the first fixture 21 and the second fixture 22 projected on the same plane along the first direction X. The first direction X, the second direction Y, and the third direction Z intersect with each other.

[0108] Optionally, the first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0109] In this embodiment, multiple first limiting portions 13 are relatively arranged along the second direction Y. There may be two first limiting portions 13 relatively arranged, or three or more first limiting portions 13 relatively arranged along the second direction Y, wherein multiple first limiting portions 13 are provided on at least one side.

[0110] In this embodiment, multiple second limiting portions 14 are relatively arranged along the third direction Z. There may be two second limiting portions 14 relatively arranged, or three or more second limiting portions 14 relatively arranged along the third direction Z, wherein at least one side is provided with multiple second limiting portions 14.

[0111] The second direction Y of this embodiment is an arrangement direction of a projection of the first fixture 21 along the first direction X on a plane to a projection of the second fixture 22 along the first direction X on the plane.

[0112] The plurality of first limiting portions 13 limit the main body 210 along the second direction Y, and the plurality of second limiting portions 14 limit the main body 210 along the third direction Z, so as to reduce the movement of the main body 210 along the second direction Y and the third direction Z during welding. In addition, the first limiting portions 13 and the second limiting portions 14 are arranged to protrude from the base 12, so that the limiting effect is better.

[0113] In some embodiments, the first fixture 21 is provided with a limiting groove 23 for limiting the adapter, and / or the second fixture 22 is provided with a limiting groove 23 for limiting the adapter.

[0114] Optionally, the limiting groove 23 of the first fixture 21 and the limiting groove 23 of the second fixture 22 have the same shape.

[0115] The limiting groove 23 is used to limit the adapter, which facilitates the placement of the adapter and the welding of the tab.

[0116] In some embodiments, the first cushioning member 31 is located above the support member 1, and the support device 100 also includes a first bottom plate 4 and a second bottom plate 5, the first bottom plate 4 is located below the second cushioning member 32, and the second bottom plate 5 is located below the second fixture 22, and the first bottom plate 4 and the second bottom plate 5 are both connected to the support member 1; the first bottom plate 4, the second cushioning member 32 and the first fixture 21 are connected in sequence, and the second bottom plate 5 is connected to the second fixture 22.

[0117] In this embodiment, the first bottom plate 4 and the support member 1 can be connected by means of thread connection or welding. The second bottom plate 5 and the support member 1 can be connected by means of thread connection or welding.

[0118] Optionally, the first bottom plate 4 and the second bottom plate 5 are integrally provided.

[0119] In this embodiment, the first base plate 4, the second padding member 32 and the first fixture 21 are connected in sequence, and specifically, they can be connected by a bolt and nut assembly penetrating through the three, welding or bonding.

[0120] The second base plate 5 and the second fixture 22 of this embodiment can be connected by bolt connection, welding or bonding.

[0121] The first bottom plate 4 is provided to provide a mounting base for the second padding member 32, so as to facilitate the determination of the position of the second padding member 32. The second bottom plate 5 is provided to provide a mounting base for the second fixture 22, so as to facilitate the determination of the position of the second fixture 22.

[0122] Figure 8 A schematic structural diagram of a first base plate and a second cushioning member in a support device provided in some embodiments of the present application.

[0123] See also Figure 8In some embodiments, the second padding member 32 is provided with a third positioning portion 321, and the first bottom plate 4 is provided with a fourth positioning portion 41. The third positioning portion 321 and the fourth positioning portion 41 are plugged together to position the first bottom plate 4 and the second padding member 32 relative to each other.

[0124] The third positioning portion 321 and the fourth positioning portion 41 of this embodiment are plug-fitted. For example, the third positioning portion 321 can be a protrusion or a groove, and the fourth positioning portion 41 can be a groove or a protrusion. For another example, the third positioning portion 321 can be a protrusion or a through hole, and the fourth positioning portion 41 can be a through hole or a protrusion.

[0125] This arrangement is used to position the second raising member 32 and the first bottom plate 4, so that the next step of connection is convenient after alignment.

[0126] The embodiment of the present application further provides a welding device, including the above-mentioned supporting device 100 and a welding mechanism, the welding mechanism is used to weld together a plurality of first pole tabs 220 and one of the adapters and to weld together a plurality of second pole tabs 230 and another adapter.

[0127] The welding mechanism of this embodiment can perform welding by laser welding or ultrasonic welding.

[0128] Fig. 9 A schematic diagram of the structure of a battery cell provided in some embodiments of the present application; Fig.10 A partial structural schematic diagram of a battery cell provided in some embodiments of the present application.

[0129] See also Fig. 9 and Fig.10The embodiment of the present application also provides a battery cell 300, including a housing 350, an electrode assembly 200, an adapter assembly and a terminal assembly. A plurality of electrode assemblies 200 are located in the housing 350, and the plurality of electrode assemblies 200 form two electrode units 400. The electrode unit 400 includes a main body 210, a plurality of mutually gathered first pole tabs 220 and a plurality of mutually gathered second pole tabs 230. The first pole tab 220 and the second pole tab 230 are arranged on the same side of the main body 210 and have opposite polarities. The thickness of the first pole tab 220 is less than that of the second pole tab 230. The plurality of second pole tabs 230 include an inner pole tab 240 and an outer pole tab 250. In the thickness direction of the electrode unit 400, the outer pole tab 250 is closer to the housing 350 than the inner pole tab 240. The adapter assembly is located in the housing 350, and the adapter assembly includes a first adapter 310 and a second adapter 320. The first adapter 310 is welded to a plurality of first tabs 220, and the second adapter 320 is welded to a plurality of second tabs 230. The terminal assembly is disposed in the housing 350, and the terminal assembly includes a first electrode terminal 330 and a second electrode terminal 340. The first electrode terminal 330 is connected to the first adapter 310, and the second electrode terminal 340 is connected to the second adapter 320. The length of the unwelded portion of the inner tab 240 is greater than the length of the unwelded portion of the outer tab 250.

[0130] The electrode assembly 200 of this embodiment may be a winding structure, a laminated structure, or a mixed structure of winding and laminated structures. The number of electrode assemblies 200 may be two or four.

[0131] The housing 350 of this embodiment can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell) or an aluminum-plastic film. Exemplarily, the housing 350 includes an end cap and a shell, the shell is provided with an opening, and the end cap is provided on the opening. The shell can be provided with one or more openings. One or more end caps can also be provided. The terminal assembly is provided on the end cap.

[0132] Exemplarily, the first electrode tab 220 is a copper electrode tab, which is a negative electrode tab, and the second electrode tab 230 is an aluminum electrode tab, which is a positive electrode tab.

[0133] The plurality of electrode assemblies 200 of the present embodiment form two electrode units 400 . The first electrode tabs 220 of the two electrode units 400 are welded to the first adapter 310 , and the second electrode tabs 230 of the two electrode units 400 are welded to the second adapter 320 .

[0134] The electrode unit 400 of this embodiment can be formed by an electrode assembly 200, such as Fig. 9 As shown; it can also be formed by two electrode assemblies 200, such as Fig.10As shown. All first pole tabs 220 of an electrode unit 400 are gathered together and bent together, and all second pole tabs 230 are gathered together and bent together. Of course, an electrode unit 400 can also include three or more electrode assemblies 200.

[0135] The inner electrode tab 240 and the outer electrode tab 250 of the embodiment of the present application are respectively located at the innermost side and the outermost side of the plurality of second electrode tabs 230 .

[0136] The length of the unwelded portion of the inner pole ear 240 in the embodiment of the present application refers to the length of the portion of the inner pole ear 240 that is not welded to the second adapter 320 in its own bending direction, and the length of the unwelded portion of the outer pole ear 250 refers to the length of the portion of the outer pole ear 250 that is not welded to the second adapter 320 in its own bending direction.

[0137] In this embodiment, the first electrode terminal 330 and the first adapter 310 may be conductively connected by welding, and the second electrode terminal 340 and the second adapter 320 may be conductively connected by welding.

[0138] The battery cell 300 of the present embodiment sets the length of the unwelded portion of the inner pole ear 240 to be greater than the length of the unwelded portion of the outer pole ear 250. In this way, the inner pole ear 240 expands outward, and the outer pole ear 250 expands outward along with the inner pole ear 240 due to its shorter length. The morphology of the multiple second pole ears 230 is approximately C-shaped. The C-shaped second pole ear 230 fully utilizes the folded pole ear space in the battery cell 300, thereby reducing the possibility of the second pole ear 230 extending into the main body 210, improving the redundancy problem of the second pole ear 230, reducing the possibility of the main body 210 being bent by the second pole ear 230 and short-circuiting, improving the quality of the electrode assembly 200, and improving the reliability of the battery cell 300.

[0139] Fig.11 A schematic diagram of the structure of a battery device provided in some embodiments of the present application.

[0140] See also Fig.11 The embodiment of the present application further provides a battery device 500 , including the above-mentioned battery cell 300 .

[0141] The battery device 500 mentioned in the embodiment of the present application may include one or more battery cell assemblies 520 for providing voltage and capacity. The battery cell assembly 520 includes a plurality of battery cells 300, and the plurality of battery cells 300 are connected in series, in parallel or in hybrid connection through a busbar.

[0142] In some embodiments, the battery cell assembly 520 is generally formed by arranging a plurality of battery cells 300; as an example, the battery cell assembly 520 may be a battery module, which is formed by arranging and fixing a plurality of battery cells 300 to form an independent module. As an example, the battery module may be formed by bundling a plurality of battery cells 300 by a cable tie.

[0143] In some embodiments, the battery device 500 may be a battery pack, which includes a case 510 and one or more battery cell assemblies 520 , wherein the battery cell assemblies 520 are accommodated in the case 510 .

[0144] As an example, the battery cell assembly 520 may be a battery module, and the battery cell assembly 520 may be accommodated in the box body 510 by fixing the battery module in the box body 510 .

[0145] As an example, the battery cell assembly 520 may also be accommodated in the case 510 by directly fixing the plurality of battery cells 300 to the case 510 .

[0146] As an example, the box 510 may include a first box and a second box. The first box and the second box are buckled together to form a closed space inside the box 510 to accommodate the battery cell assembly 520. The closed space here means covering or closing, which may be sealed or unsealed. The first box 510 may be a top cover or a bottom plate.

[0147] As an example, the box body 510 may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that a closed space is formed inside the box body 510 to accommodate the battery cell assembly 520.

[0148] As an example, the box 510 can be used as a part of the chassis structure of the vehicle. For example, the top cover of the box 510 can become at least a part of the floor of the vehicle, or the frame of the box 510 can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0149] In some embodiments, the battery device 500 refers to an energy storage device, which includes a box 510, at least one side of which is provided with a door. The energy storage device includes an energy storage container, an energy storage cabinet, and the like.

[0150] Fig.12 A schematic diagram of the structure of a vehicle provided for some embodiments of the present application.

[0151] See also Fig.12 The embodiment of the present application also provides an electrical device, including the above-mentioned battery device 500, and the battery device 500 is used to provide electrical energy.

[0152] The technical solutions described in the embodiments of the present application are applicable to various electrical devices using battery cells 300 and battery devices 500, such as mobile phones, portable devices, laptop computers, battery cars, electric toys, electric tools, vehicles, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc. For the convenience of description, the following embodiments are described by taking the electrical device as a vehicle 600 as an example.

[0153] The battery device 500 is disposed inside the vehicle 600, and the battery device 500 may be disposed at the bottom, head, or tail of the vehicle 600. The battery device 500 may be used to power the vehicle 600, for example, the battery device 500 may be used as an operating power source for the vehicle 600.

[0154] The vehicle 600 may further include a controller 610 and a motor 620 , wherein the controller 610 is used to control the battery device 500 to supply power to the motor 620 , for example, to meet the power requirements of starting, navigating, and driving the vehicle 600 .

[0155] In some embodiments of the present application, the battery device 500 can not only serve as an operating power source for the vehicle 600, but also serve as a driving power source for the vehicle 600, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 600.

[0156] See also Figure 2-Figure 5, the embodiment of the present application provides a support device 100, which is used in the welding process of the adapter and the electrode assembly 200. At least one electrode assembly 200 forms an electrode unit 400, and the electrode unit 400 includes a main body 210, a plurality of first pole tabs 220 and a plurality of second pole tabs 230. The first pole tab 220 and the second pole tab 230 are arranged on the same side of the main body 210 and have opposite polarities, and the thickness of the first pole tab 220 is less than the thickness of the second pole tab 230. The support device 100 includes a support member 1, a fixture assembly 2 and a padding assembly 3. The support member 1 is used to support and limit the main body 210. The fixture assembly 2 includes a first fixture 21 and a second fixture 22. The first fixture 21 is used to support and limit the adapter welded with the first pole tab 220, and the second fixture 22 is used to support and limit the adapter welded with the second pole tab 230. The padding assembly 3 includes at least one first padding member 31 and at least one second padding member 32. The at least one first padding member 31 is arranged above or below the support member 1 and is used to pad the main body 210. The at least one second padding member 32 is arranged below the first fixture 21 and is used to pad the first fixture 21. The first padding member 31 is detachably connected to the support member 1, and the second padding member 32 is detachably connected to the first fixture 21. The total thickness of the at least one first padding member 31 located above or below the support member 1 is h1, and the total thickness of the at least one second padding member 32 located below the first fixture 21 is h2, and h1 and h2 satisfy: h1≤h2. The first padding member 31 and the second padding member 32 are both plate-like members with a preset thickness.

[0157] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0158] 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 it. 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 of the technical features therein, but these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A support device, used in a welding process of an adapter and an electrode assembly, wherein at least one of the electrode assemblies forms an electrode unit, the electrode unit comprises a main body, a plurality of first pole tabs and a plurality of second pole tabs, the first pole tab and the second pole tab are arranged on the same side of the main body and have opposite polarities, the thickness of the first pole tab is less than the thickness of the second pole tab, and is characterized in that: The supporting device comprises: A support member, used for supporting and limiting the main body; A fixture assembly, comprising a first fixture and a second fixture, wherein the first fixture is used to support and limit the adapter welded to the first pole tab, and the second fixture is used to support and limit the adapter welded to the second pole tab; The raising component includes at least one first raising member and at least one second raising member, wherein at least one first raising member is arranged above or below the supporting member and is used to raise the main body, and at least one second raising member is arranged below the first fixture and is used to raise the first fixture.

2. The support device according to claim 1, characterized in that: The first padding member is detachably connected to the supporting member, and / or the second padding member is detachably connected to the first fixture.

3. The supporting device according to claim 1, characterized in that: The total thickness of at least one of the first padding parts located above or below the support part is h1, and the total thickness of at least one of the second padding parts located below the first fixture is h2, and h1 and h2 satisfy: h1≤h2.

4. The supporting device according to claim 1, characterized in that: The first cushioning member and the second cushioning member are both plate-shaped members with a preset thickness.

5. The supporting device according to claim 4, characterized in that: The first padding member has a first identification portion, and the first identification portion is used to mark the thickness of the first padding member; and / or, The second padding member has a second identification portion, and the second identification portion is used to mark the thickness of the second padding member.

6. The supporting device according to claim 1, characterized in that: The first padding member is provided with a first positioning portion, and the supporting member is provided with a second positioning portion. The first positioning portion and the second positioning portion are plug-fitted to position the supporting member and the first padding member relative to each other.

7. The supporting device according to claim 1, characterized in that: There are multiple first padding members, and the multiple first padding members are arranged in sequence along the thickness direction of the first padding member, and any two adjacent first padding members are matched in concave and convex shapes.

8. The supporting device according to claim 1, characterized in that: There are multiple second padding members, and the multiple second padding members are arranged in sequence along the thickness direction of the second padding member, and any two adjacent second padding members are matched in concave and convex shapes.

9. The supporting device according to claim 1, characterized in that: The support member includes a base, a plurality of first limiting portions and a plurality of second limiting portions, the base is used to support the main body, the first limiting portions and the second limiting portions are both arranged to protrude from the base along a first direction, the plurality of first limiting portions are relatively arranged along a second direction to limit the main body in the second direction, the plurality of second limiting portions are relatively arranged along a third direction to limit the main body in the third direction, the first direction is parallel to an arrangement direction from the support member to the first cushioning member, the second direction is parallel to an arrangement direction of the first fixture and the second fixture projected on the same plane along the first direction, and the first direction, the second direction and the third direction intersect with each other.

10. The supporting device according to claim 1, characterized in that: The first fixture is provided with a limiting groove for limiting the adapter, and / or the second fixture is provided with a limiting groove for limiting the adapter.

11. The support device according to claim 1, characterized in that: The first padding member is located above the support member, and the support device also includes a first bottom plate and a second bottom plate, the first bottom plate is located below the second padding member, the second bottom plate is located below the second fixture, the first bottom plate and the second bottom plate are both connected to the support member, the first bottom plate, the second padding member and the first fixture are connected in sequence, and the second bottom plate is connected to the second fixture.

12. The supporting device according to claim 11, characterized in that: The second padding member is provided with a third positioning portion, the first bottom plate is provided with a fourth positioning portion, and the third positioning portion and the fourth positioning portion are plug-fitted to position the first bottom plate and the second padding member relative to each other.

13. A welding device, characterized in that: include: The supporting device according to any one of claims 1 to 12; The welding mechanism is used for welding the plurality of the first pole tabs and one of the adapters together and for welding the plurality of the second pole tabs and another of the adapters together.

14. A battery cell, characterized in that: include: shell; A plurality of electrode assemblies are located in the shell, the plurality of electrode assemblies form two electrode units, the electrode unit comprises a main body, a plurality of mutually gathered first pole ears and a plurality of mutually gathered second pole ears, the first pole ears and the second pole ears are arranged on the same side of the main body and have opposite polarities, the thickness of the first pole ear is less than the thickness of the second pole ear, the plurality of second pole ears comprise an inner pole ear and an outer pole ear, and in the thickness direction of the electrode unit, the outer pole ear is closer to the shell than the inner pole ear; An adapter assembly is located in the housing, the adapter assembly includes a first adapter and a second adapter, the first adapter is welded to the first plurality of tabs, and the second adapter is welded to the second plurality of tabs; A terminal assembly is arranged in the shell, and the terminal assembly includes a first electrode terminal and a second electrode terminal, the first electrode terminal is connected to the first adapter, and the second electrode terminal is connected to the second adapter; wherein the length of the unwelded portion of the inner pole ear is greater than the length of the unwelded portion of the outer pole ear.

15. A battery device, characterized in that: Comprising the battery cell as claimed in claim 14.

16. An electrical device, characterized in that: Comprising the battery device as claimed in claim 15, the battery device is used to provide electrical energy.

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