A tab, clamp and battery

Abstract

This utility model relates to the technical field of batteries, and discloses a tab, a clamp, and a battery. The tab includes an integrally connected tab body and a lead-out portion. The tab body is used to connect with the electrode of the battery cell and is encapsulated together with the battery cell within a soft-pack shell. The lead-out portion is used to extend outward relative to the soft-pack shell. The end of the lead-out portion connected to the tab body is designated as the first end, and the end of the lead-out portion away from the tab body is designated as the second end. The thickness of the lead-out portion gradually increases from the first end to the second end, and the width of the lead-out portion at the second end is greater than the width of the first end. This solution improves both the thickness and width of the lead-out portion of the tab, enabling the clamp to establish a reliable conductive connection with the tab after clamping the lead-out portion, thereby effectively solving the problem of poor contact between the battery and the clamp after it is placed on the shelf.

Description

Technical Field

[0001] This utility model relates to the technical field of batteries, and in particular to a tab, a clamp, and a battery. Background Technology

[0002] The thickness of the positive and negative tabs of existing pouch batteries is mostly between 0.05mm and 0.12mm. Due to the thinness of these tabs, and the smooth surface of the test fixture used to hold the tabs and perform charge / discharge tests, poor conductivity between the test fixture and the tabs often occurs. This is especially true when the tabs are aluminum. The aluminum tabs react with oxygen in the air to form a dense aluminum oxide insulating layer on their surface. When the pouch battery is transported to the test cabinet for formation and capacity testing, the aluminum tabs with the aluminum oxide insulating layer are more likely to have poor contact with the test fixture, leading to abnormal charging and discharging of the battery. This, in turn, can cause manufacturing defects in the battery and affect the manufacturing yield. Utility Model Content

[0003] This utility model provides a tab, a clamp, and a battery, mainly solving the technical problem of how to prevent poor contact between the tab and the clamp.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] An electrode tab includes an integrally connected electrode body and a lead-out portion. The electrode body is used to connect with the electrode plate of a battery cell and is encapsulated together with the battery cell within a soft-pack housing. The lead-out portion is used to extend outward relative to the soft-pack housing. The end of the lead-out portion connected to the electrode body is a first end, and the end of the lead-out portion away from the electrode body is a second end. The thickness of the lead-out portion gradually increases from the first end to the second end, and the width of the lead-out portion at the second end is greater than the width of the first end.

[0006] In one of the technical solutions, the thickness of the first end is 0.06mm-0.1mm, and the thickness of the second end is 0.12mm-0.2mm.

[0007] In one of the technical solutions, the first end gradually thickens towards the second end with a slope of 2°-8°.

[0008] In one of the technical solutions, the lead-out portion has a generally fan-shaped structure at the second end, and the fan-shaped structure is used for clamping by the fixture.

[0009] In one of the technical solutions, the length of the fan-shaped structure is 3mm-5mm, and the central angle of the fan-shaped structure is 30°-45°.

[0010] This application also provides a clamp, including a clamping part for clamping the lead-out part of the aforementioned electrode tab.

[0011] In one of the technical solutions, the clamping part is provided with a plurality of protruding pins, all of which are used to pierce the lead-out part of the electrode tab.

[0012] In one of the technical solutions, the height of the protruding pin is 0.01mm-0.025mm, and the distance between two adjacent protruding pins is 0.3mm-0.5mm.

[0013] In one of the technical solutions, the clamping part clamps the lead-out part for a length of 3mm-5mm.

[0014] This application also provides a battery, including a battery cell, a pouch casing, and at least two tabs of opposite polarity as described above. The tab bodies of the two tabs are respectively connected to the battery cell. The pouch casing encloses the battery cell and the tab bodies of the two tabs. The leads of the two tabs extend outward relative to the pouch casing.

[0015] Compared with the prior art, the electrode tab provided by this utility model has at least the following beneficial effects:

[0016] The lead-out portion of the electrode in this design is designed with a gradually increasing thickness and a wider clamping width. In other words, by improving both the thickness and width of the lead-out portion of the electrode, this design enables the clamp to establish a reliable conductive connection with the electrode after clamping the lead-out portion, thereby effectively solving the problem of poor contact between the battery and the clamp after it is placed in the cabinet. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art 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.

[0018] Figure 1 This is a schematic diagram of the structure of a battery provided in an embodiment of this application;

[0019] Figure 2 for Figure 1 A magnified view of a section at point A in the middle;

[0020] Figure 3 This is a schematic diagram of the battery structure after the soft-pack casing is hidden, as provided in an embodiment of this application.

[0021] Figure 4 for Figure 3A magnified view of a section at point B in the middle;

[0022] Figure 5 This is a schematic diagram of the structure of the fixture provided in the embodiments of this application;

[0023] Figure 6 This is a schematic diagram of the fixture provided in an embodiment of this application from another angle.

[0024] Figure label:

[0025] 1. Battery cell; 2. Soft-pack outer shell; 20. Sealing edge; 3. Electrode; 31. Electrode body; 32. Lead-out part; 321. First end; 322. Second end; 4. Clamping part; 41. Protruding pin. Detailed Implementation

[0026] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0027] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0028] It should be understood that the terms "upper", "lower", "top", "bottom", "inner", "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 application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0030] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0031] Please refer to the following: Figures 1 to 3This utility model provides a battery comprising a cell 1, a soft-pack casing 2, and at least two tabs 3 of opposite polarity. The two tabs 3 are respectively connected to the cell 1. The soft-pack casing 2 is typically made of aluminum-plastic film and wraps the cell 1 to seal it inside. At the same time, the sealing edge 20 of the soft-pack casing 2 also wraps a portion of each tab 3. Each tab 3 extends outward relative to the soft-pack casing 2 to lead out the positive and negative electrodes of the cell 1. Moreover, a hot melt adhesive layer is usually provided between each tab 3 and the inner layer of the soft-pack casing 2 to seal the gap between the tab 3 and the soft-pack casing 2 and prevent the internal electrolyte from leaking outward from the gap between the tab 3 and the soft-pack casing 2.

[0032] Please refer to the following: Figures 1 to 4 The electrode 3 specifically includes an integrally connected electrode body 31 and lead-out portion 32. The electrode body 31 is used to connect with the aforementioned battery cell 1 and is wrapped inside by the aforementioned sealing edge 20. The lead-out portion 32 extends outward relative to the aforementioned soft-pack outer shell 2 to lead out the positive or negative electrode of the battery cell 1. To clearly illustrate the specific structure of the tab 3, in this embodiment, the end of the lead-out portion 32 connected to the tab body 31 is the first end portion 321, and the end of the lead-out portion 32 away from the tab body 31 is the second end portion 322. In this embodiment, the thickness of the lead-out portion 32 is designed to gradually increase from the first end portion 321 to the second end portion 322. Furthermore, in this embodiment, the width of the lead-out portion 32 at the second end portion 322 is designed to be greater than the width of the first end portion 321. By making the above-mentioned improvements to the thickness and width of the lead-out portion 32 of the tab 3, this solution enables the clamp to establish a reliable conductive connection with the tab 3 after clamping the lead-out portion 32 of the tab 3, thereby effectively solving the problem of poor contact between the battery and the clamp after it is placed on the cabinet. In other words, after the battery in this embodiment adopts this tab 3, it can reliably establish an electrical connection with the clamp under the clamping of the clamp, thereby ensuring that the battery will not experience an open circuit during testing or capacity formation, which is beneficial to improving the manufacturing quality of the battery.

[0033] Please refer to the following: Figures 1 to 4In this embodiment, the thickness a of the first end 321 of the lead-out portion 32 is preferably designed to be 0.06mm-0.1mm, and the thickness b of the second end 322 of the lead-out portion 32 is designed to be 0.12mm-0.2mm. Furthermore, the first end 321 gradually thickens towards the second end 322 with a slope g of 2°-8°. More preferably, the second end 322 of the lead-out portion 32 is designed in a roughly fan-shaped structure. This fan-shaped structure is actually used for clamping by the fixture. By designing the second end 322 as a fan-shaped structure, the clamping area of ​​the fixture on the tab 3 can be increased, thereby further improving the reliability of the conductive connection between the fixture and the tab. Since the length of the tab 3 clamped by the fixture is generally 3mm-5mm, the length d of the fan-shaped structure is preferably 3mm-5mm, and the central angle c corresponding to the fan-shaped structure is preferably 30°-45°.

[0034] Please refer to the following: Figure 5 and Figure 6 This embodiment also provides a clamp, which includes a clamping part 4 for clamping the lead-out part 32 of the aforementioned tab 3. Typically, the clamping part 4 clamps the tab 3 for a length of 3mm-5mm. The clamping part 4 is provided with a plurality of spaced protrusions 41, which are used to pierce the lead-out part 32 of the tab 3. With this design, even if the aluminum tab 3 has a layer of aluminum oxide on its surface, the protrusions 41 can pierce the tab 3 to make good contact with the aluminum layer inside the tab 3, thereby helping to ensure the reliability of mutual conductivity between the clamping part 4 and the tab 3. The height e of the protrusions 41 is preferably 0.01mm-0.025mm. This height of the protrusions 41 ensures that it can pierce the aluminum oxide on the surface of the tab 3 without causing excessive damage to the tab 3. The distance f between two adjacent protrusions 41 is preferably 0.3mm-0.5mm.

[0035] The above are merely preferred embodiments of the present utility model, and only specifically describe the technical principles of the present utility model. These descriptions are only for explaining the principles of the present utility model and should not be construed as limiting the scope of protection of the present utility model in any way. Based on this explanation, any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model, as well as other specific embodiments of the present utility model that can be conceived by those skilled in the art without creative effort, should be included within the scope of protection of the present utility model.

Claims

1. A tab, characterized by, The device includes an integrally connected electrode body and a lead-out portion. The electrode body is used to connect with the battery cell and is encapsulated together with the battery cell within a soft-pack housing. The lead-out portion is used to extend outward relative to the soft-pack housing. The end of the lead-out portion connected to the electrode body is a first end, and the end of the lead-out portion away from the electrode body is a second end. The thickness of the lead-out portion gradually increases from the first end to the second end, and the width of the lead-out portion at the second end is greater than the width of the first end.

2. The tab of claim 1, wherein The thickness of the first end is 0.06mm-0.1mm, and the thickness of the second end is 0.12mm-0.2mm.

3. The tab of claim 1, wherein The first end gradually thickens towards the second end with a slope of 2°-8°.

4. The tab of claim 1, wherein The lead-out portion has a generally fan-shaped structure at the second end, and the fan-shaped structure is used for clamping by the fixture.

5. The tab of claim 3, wherein The length of the fan-shaped structure is 3mm-5mm, and the central angle corresponding to the fan-shaped structure is 30°-45°.

6. A clamp characterized in that, Includes a clamping part for clamping the lead-out portion of the electrode tab as described in any one of claims 1 to 5.

7. The clamp of claim 6, wherein The clamping part is provided with a plurality of protruding pins, all of which are used to pierce the lead-out part of the electrode tab.

8. The clamp of claim 7, wherein The height of the protruding pin is 0.01mm-0.025mm, and the distance between two adjacent protruding pins is 0.3mm-0.5mm.

9. The clamp of claim 6, wherein The clamping part clamps the lead-out part for a length of 3mm-5mm.

10. A battery, characterized by The device includes a battery cell, a soft-pack casing, and at least two tabs of opposite polarity as described in any one of claims 1 to 5. The tab bodies of the two tabs are respectively connected to the battery cell. The soft-pack casing encloses the battery cell and the tab bodies of the two tabs. The leads of the two tabs extend outward relative to the soft-pack casing.

Images