Welding structure of tab and pole and battery

Abstract

The utility model provides a kind of welding structure of tab and pole and battery.The utility model embodiment's welding structure of tab and pole includes tab component, wrapping piece, pole and welding portion.Tab component includes multiple tabs, and each tab has welding area, and wrapping piece wraps tab component, so that the welding area of multiple tabs is stacked along the thickness direction of tab;Pole is in contact with the outer wall of wrapping piece, to form electrical connection.Welding portion passes through wrapping piece, multiple tabs, wrapping piece in turn, and extends to pole, to connect wrapping piece, multiple tabs and pole.Therefore, the utility model embodiment's welding structure of tab and pole can reduce the complexity degree of process of welding structure of tab and pole and improve the success rate of welding structure of pole.

Description

Technical Field

[0001] This utility model relates to the field of lithium-ion battery technology, and in particular to a welding structure of tabs and terminals and a battery. Background Technology

[0002] Existing consumer and power battery cells use multi-layered tabs, which cannot be directly welded to the terminal post. Therefore, the terminal post connection adopts the method of ultrasonic welding of the tab to the adapter plate first, and then laser welding of the adapter plate to the terminal post. This requires two welding processes, which are complex and require complex process control. At the same time, ultrasonic welding can cause tab breakage and redundancy problems, which will restrict the efficiency of the terminal post welding structure.

[0003] Therefore, the welding structure of the electrode tab and electrode post in related technologies has the problems of complex process and low product yield. Utility Model Content

[0004] This utility model provides a welding structure for a tab and a post, which solves the problems of complex process and low yield rate of welding structure for tab and post in related technologies, thereby reducing the process complexity of welding structure for tab and post and improving the yield rate of welding structure for post.

[0005] The welding structure of the electrode lug and electrode post in this embodiment of the utility model includes:

[0006] The electrode assembly includes multiple electrodes, each electrode having a welding area.

[0007] A package that encloses the tab assembly such that the welding areas of the plurality of tabs are stacked along the thickness direction of the tabs;

[0008] The electrode post abuts against the outer wall of the package.

[0009] The welding part passes sequentially through the package, the plurality of tabs, the package, and extends to the pole post to connect the package, the plurality of tabs, and the pole post.

[0010] It is understood that the welded part is formed by the solidification of a weld pool created by the welding laser passing through the package, the plurality of the tabs, the package and extending to the pole.

[0011] By using a packaging component to stack and fix multiple tabs, and simultaneously using a welding laser to pass through the packaging component, the multiple tabs, the packaging component, and extend to the pole to form a welded part, on the one hand, the number of welding steps required for the welding structure of the tabs and poles in this embodiment of the invention can be reduced, thus reducing the complexity of the welding process; on the other hand, laser welding can avoid tab breakage and redundancy problems, which can greatly improve the yield of the welding structure of the tabs and poles in this embodiment of the invention.

[0012] Therefore, the welding structure of the electrode lug and electrode post in this embodiment of the present invention can reduce the complexity of the welding process and improve the efficiency of the electrode post welding structure.

[0013] In some embodiments, the package includes a first package portion and a second package portion, the first package portion being located on one side of the electrode assembly in the thickness direction, the second package portion being located on the other side of the electrode assembly in the thickness direction, one end of the first package portion being connected to one end of the second package portion, and the other end of the first package portion being connected to the other end of the second package portion.

[0014] The plurality of tabs are located between the first wrapping portion and the second wrapping portion, and the second wrapping portion abuts against the pole post.

[0015] In some embodiments, the welding portion includes a first welding sub-portion located in the first wrapping portion, a second welding sub-portion located in the plurality of electrode tabs, a third welding sub-portion located in the second wrapping portion, and a fourth welding sub-portion located in the electrode post;

[0016] The circumferential dimensions of the first welding sub-part, the second welding sub-part, the third welding sub-part, and the fourth welding sub-part decrease sequentially.

[0017] In some embodiments, the diameter of the first welded sub-part is 0.25-0.5 mm.

[0018] In some embodiments, the diameter of the second welded sub-part is 0.2-0.47 mm.

[0019] In some embodiments, the diameter of the third welded sub-part is 0.15-0.42 mm.

[0020] In some embodiments, the diameter of the fourth welding sub-part is 0.12-0.38 mm, and the dimension of the fourth welding sub-part in the thickness direction of the pole post is greater than 0.05 mm and less than the thickness of the pole post.

[0021] In some embodiments, the package further includes a third package portion and a fourth package portion, the third package portion being located on one side in the width direction of the tab assembly; the fourth package portion being located on the other side in the thickness direction of the tab assembly;

[0022] One end of the third package is connected to one end of the first package, and the other end of the third package is connected to one end of the second package. One end of the fourth package is connected to the other end of the first package, and the other end of the fourth package is connected to the other end of the second package.

[0023] In some embodiments, the package is a nickel sheet or an aluminum sheet;

[0024] The aluminum sheet has a thickness of 0.05-0.1 mm, and the nickel sheet has a thickness of 0.05-0.1 mm.

[0025] This utility model also provides a battery.

[0026] The battery of this utility model embodiment includes the welding structure of the tab and the terminal as described in the above embodiment. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the battery structure according to an embodiment of the present invention;

[0029] Figure 2 This is a cross-sectional view of the welding structure of the electrode tab and electrode post according to an embodiment of this utility model.

[0030] In the picture:

[0031] 100. Welding structure between the tab and the terminal; 200. Battery;

[0032] 1. Electrode assembly; 101. Electrode;

[0033] 2. Package; 201. First package section; 202. Second package section; 203. Third package section; 204. Fourth package section;

[0034] 3. Pole post;

[0035] 4. Welding section; 401. First welding subsection; 402. Second welding subsection; 403. Third welding subsection. Detailed Implementation

[0036] To make the technical problems solved, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0037] In the description of this utility model, it should be understood that the terms "longitudinal," "radial," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0038] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal encapsulation of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0039] In order to solve the problems of complex process and low yield of welding structure 100 of electrode tab and electrode post in related technologies, the goal is to reduce the process complexity of welding structure 100 of electrode tab and electrode post and improve the yield of welding structure 3 of electrode post.

[0040] This utility model provides a welding structure 100 for the electrode tab and the electrode post.

[0041] The welding structure 100 of the electrode tab and electrode post in this embodiment of the present invention includes an electrode tab assembly 1, a wrapping component 2, an electrode post 3, and a welding part 4.

[0042] The tab assembly 1 includes multiple tabs 101, and each tab 101 has a welding area. The welding areas of each tab 101 are in the same position. Multiple tabs 101 are stacked in their thickness direction to form the tab assembly 1. That is, the length direction, thickness direction and width direction of the tab assembly 1 are respectively aligned with the length direction, thickness direction and width direction of the tab 101.

[0043] Furthermore, the package 2 wraps around the tab assembly 1 so that the welding areas of the multiple tabs 101 are stacked along the thickness direction of the tabs 101, which can further fix the multiple tabs 101, position the multiple tabs 101, and prevent displacement during subsequent welding.

[0044] The pole 3 abuts against the outer wall of the package 2 to form an electrical connection.

[0045] like Figure 2 As shown, the welding part 4 passes through the package 2, multiple tabs 101, and the package 2 in sequence, and extends to the pole post 3 to connect the package 2, multiple tabs 101 and pole post 3.

[0046] It is understood that the welded part 4 is formed by the solidification of a weld pool formed by the welding laser passing through the package 2, the plurality of tabs 101, the package 2 and extending to the pole 3.

[0047] By using the packaging component 2 to stack and fix multiple tabs 101, and simultaneously using a welding laser to pass through the packaging component 2, the multiple tabs 101, and the packaging component 2 and extend to the pole post 3 to form a welded part 4, on the one hand, the number of welding steps required for the welding structure 100 of the tabs and pole post in this embodiment of the present invention can be reduced, and the process complexity of the welding structure 100 of the tabs and pole post in this embodiment of the present invention can be reduced; on the other hand, laser welding can avoid the problems of tab 101 breakage and redundancy, and can greatly improve the yield of the welding structure 100 of the tabs and pole post in this embodiment of the present invention.

[0048] Therefore, the welding structure 100 of the electrode tab and electrode post in this embodiment of the present invention can reduce the complexity of the welding process of the electrode tab and electrode post 100 and improve the welding efficiency of the electrode post 3.

[0049] In some embodiments, the package 2 includes a first package portion 201 and a second package portion 202. The first package portion 201 is located on one side in the thickness direction of the tab assembly 1, and the second package portion 202 is located on the other side in the thickness direction of the tab assembly 1. One end of the first package portion 201 is connected to one end of the second package portion 202, and the other end of the first package portion 201 is connected to the other end of the second package portion 202.

[0050] Multiple tabs 101 are located between the first wrapping portion 201 and the second wrapping portion 202, and the second wrapping portion 202 abuts against the pole post 3.

[0051] By placing multiple tabs 101 of the tab assembly 1 between the first wrapping part 201 and the second wrapping part 202, the multiple tabs 101 of the tab assembly 1 can be stacked and fixed. Subsequently, only one welding is needed to connect the multiple tabs 101 of the tab assembly 1 to the pole post 3 to form an electrical connection, which can greatly reduce the process complexity of the connection structure between the tabs 101 and the pole post 3 in this utility model embodiment.

[0052] In some embodiments, the welding portion 4 includes a first welding sub-portion 401 located in the first wrapping portion 201, a second welding sub-portion 402 located in the plurality of tabs 101, a third welding sub-portion 403 located in the second wrapping portion 202, and a fourth welding sub-portion located in the pole post 3; the circumferential dimensions of the first welding sub-portion 401, the second welding sub-portion 402, the third welding sub-portion 403, and the fourth welding sub-portion decrease sequentially.

[0053] Furthermore, the diameter of the first welded sub-part 401 is 0.25-0.5 mm.

[0054] Preferably, the diameter of the first welding sub-part 401 is 0.25mm, 0.30mm, 0.35mm, 0.40mm, 0.45mm, or 0.50mm.

[0055] Furthermore, the diameter of the second welded sub-part 402 is 0.2-0.47 mm.

[0056] Preferably, the diameter of the second welding sub-part 402 is 0.20mm, 0.25mm, 0.30mm, 0.35mm, 0.40mm, 0.45mm, or 0.47mm.

[0057] Furthermore, the diameter of the third welding sub-section 403 is 0.15-0.42 mm.

[0058] Preferably, the diameter of the third welding sub-part 403 is 0.15mm, 0.20mm, 0.25mm, 0.30mm, 0.35mm, 0.40mm, or 0.42mm.

[0059] Furthermore, the diameter of the fourth welding sub-part is 0.12-0.38 mm, and the dimension of the fourth welding sub-part in the thickness direction of the pole post 3 is greater than 0.05 mm and less than the thickness of the pole post 3.

[0060] Preferably, the diameter of the fourth welding sub-part is 0.12mm, 0.17mm, 0.22mm, 0.27mm, 0.32mm, 0.37mm, or 0.38mm.

[0061] By setting the diameters of the first welding sub-part 401, the second welding sub-part 402, the third welding sub-part 403, and the fourth welding sub-part, as well as the depth of the fourth welding sub-part in the pole post 3, to the range described above, it is possible to ensure that the welding strength of the welding part 4 meets the requirements of the connection structure between the tab 101 and the pole post 3 in this embodiment of the present invention.

[0062] In some embodiments, the package 2 further includes a third package portion 203 and a fourth package portion 204, wherein the third package portion 203 is located on one side in the width direction of the tab assembly 1; and the fourth package portion 204 is located on the other side in the width direction of the tab assembly 1.

[0063] One end of the third packaging section 203 is connected to one end of the first packaging section 201, and the other end of the third packaging section 203 is connected to one end of the second packaging section 202. One end of the fourth packaging section 204 is connected to the other end of the first packaging section 201, and the other end of the fourth packaging section 204 is connected to the other end of the second packaging section 202.

[0064] By providing a third wrapping part 203 and a fourth wrapping part 204 on one side and the other side of the tab assembly 1 in the width direction, the wrapping part 2 can better fit the side wall of the tab assembly 1 in the width direction, and can better fix and position the multiple tabs 101 of the tab assembly 1.

[0065] In some embodiments, the package 2 is a nickel sheet or an aluminum sheet;

[0066] The aluminum sheet has a thickness of 0.05-0.1mm, and the nickel sheet has a thickness of 0.05-0.1mm.

[0067] Preferably, the thickness of the aluminum sheet is 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, or 0.10mm.

[0068] Preferably, the thickness of the nickel sheet is 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, or 0.10mm.

[0069] By setting the aluminum and nickel sheets to the range described above, it is possible to reduce the volume occupied inside the battery 200 while ensuring the wrapping strength of the tab assembly 1.

[0070] This utility model also provides a battery 200.

[0071] The battery 200 of this utility model embodiment includes the welding structure 100 of the tab and the post described in the above embodiment.

[0072] The battery 200 of this utility model embodiment, by setting the welding structure 100 of the tab and the post described in the above embodiment, can reduce the complexity of its production and improve its product yield.

[0073] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions 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 this utility model, and should all be included within the protection scope of this utility model.

Claims

1. A welding structure for an electrode lug and an electrode post, characterized in that, include: A tab assembly (1) comprising a plurality of tabs (101) having a welding area; Package (2) wraps the tab assembly (1) so that the welding areas of the plurality of tabs (101) are stacked along the thickness direction of the tabs (101); The pole (3) abuts against the outer wall of the package (2); The welding part (4) passes through the package (2), the plurality of tabs (101), the package (2) in sequence, and extends to the pole post (3) to connect the package (2), the plurality of tabs (101) and the pole post (3).

2. The welding structure of the electrode lug and electrode post according to claim 1, characterized in that, The package (2) includes a first package portion (201) and a second package portion (202). The first package portion (201) is located on one side of the electrode assembly (1) in the thickness direction, and the second package portion (202) is located on the other side of the electrode assembly (1) in the thickness direction. One end of the first package portion (201) is connected to one end of the second package portion (202), and the other end of the first package portion (201) is connected to the other end of the second package portion (202). The plurality of tabs (101) are located between the first wrapping portion (201) and the second wrapping portion (202), and the second wrapping portion (202) abuts against the pole post (3).

3. The welding structure of the electrode lug and electrode post according to claim 2, characterized in that, The welding part (4) includes a first welding sub-part (401) located in the first wrapping part (201), a second welding sub-part (402) located in the plurality of electrode tabs (101), a third welding sub-part (403) located in the second wrapping part (202), and a fourth welding sub-part located in the electrode post (3); The circumferential dimensions of the first welding sub-part (401), the second welding sub-part (402), the third welding sub-part (403), and the fourth welding sub-part decrease sequentially.

4. The welding structure of the electrode lug and electrode post according to claim 3, characterized in that, The diameter of the first welded sub-part (401) is 0.25-0.5 mm.

5. The welding structure of the electrode lug and electrode post according to claim 3, characterized in that, The diameter of the second welded sub-part (402) is 0.2-0.47 mm.

6. The welding structure of the electrode lug and electrode post according to claim 3, characterized in that, The diameter of the third welding sub-part (403) is 0.15-0.42 mm.

7. The welding structure of the electrode lug and electrode post according to claim 3, characterized in that, The diameter of the fourth welding sub-part is 0.12-0.38 mm, and the dimension of the fourth welding sub-part in the thickness direction of the pole post (3) is greater than 0.05 mm and less than the thickness of the pole post (3).

8. The welding structure of the electrode lug and the electrode post according to claim 2, characterized in that, The package (2) further includes a third package (203) and a fourth package (204), wherein the third package (203) is located on one side of the tab assembly (1) in the width direction; and the fourth package (204) is located on the other side of the tab assembly (1) in the width direction. One end of the third package (203) is connected to one end of the first package (201), and the other end of the third package (203) is connected to one end of the second package (202). One end of the fourth package (204) is connected to the other end of the first package (201), and the other end of the fourth package (204) is connected to the other end of the second package (202).

9. The welding structure of the electrode lug and the electrode post according to claim 1, characterized in that, The package (2) is a nickel sheet or an aluminum sheet; The aluminum sheet has a thickness of 0.05-0.1 mm, and the nickel sheet has a thickness of 0.05-0.1 mm.

10. A battery, characterized in that, The welding structure (100) of the electrode lug and electrode post as described in any one of claims 1-9.

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