Novel tab structure
By designing the inner side of the tab adhesive to be curved, the problems of large space occupation and leakage at the seal of the existing tab structure are solved, achieving better space utilization and bending performance.
Patent Information
- Application Number
- CN202423227006.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-25
- Publication Date
- 2026-01-20
- Estimated Expiration
- 2034-12-25
AI Technical Summary
The existing tab structure occupies a large amount of internal space in the battery, is prone to leakage when sealed, and is inconvenient to bend.
The inner side of the tab adhesive is designed to be curved to increase the internal space of the battery. The shape of the tab adhesive is improved to reduce the risk of leakage at the seal and to improve bending performance.
This increases the internal space of the battery, reduces the risk of leakage at the seal, and improves the bending performance of the tabs and the sealing performance of the battery.
Smart Images
Figure CN223815793U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of the tab, specifically to a novel tab structure. BACKGROUND
[0002] The process generally adopted in the soft package lithium ion battery industry at present is that a positive plate, a diaphragm and a negative plate are sequentially wound or stacked to form a battery core, the positive plate leads out a positive tab, and the negative plate leads out a negative tab; then the battery core is wrapped in an aluminum plastic film and packaged to form a soft package lithium ion battery. The positive tab and the negative tab are generally composed of a metal strip and a tab adhesive symmetrically attached to the two surfaces of the metal strip, and the tab adhesive mainly plays an insulating role to prevent the metal strip from directly contacting the aluminum plastic film to form a short circuit.
[0003] In the prior art, the Chinese utility model with the application number CN202020922278.5 discloses a tab adhesive, which includes a first adhesive part including an anti-overmelt layer and adhesive layers arranged on the two surfaces of the anti-overmelt layer, and a second adhesive part connected to the periphery of the first adhesive part and including a skeleton layer and a protective layer formed by co-extrusion, with the protective layer arranged on the surface of the skeleton layer. This utility model can not only avoid abnormal phenomena such as tab rebounding and tab breaking during PACK assembly, but also improve phenomena such as conduction between the tab and the aluminum plastic film, tab adhesive delamination, battery core water absorption, and liquid leakage.
[0004] The tab in the prior art is generally a rectangular metal strip with a rectangular tab adhesive, but the rectangular tab adhesive occupies a certain space inside the battery, which hinders the diaphragm and the tab insulating adhesive tape, and when the tab insulating adhesive tape is excessively attached with the tab adhesive, the top seal head is sealed to the adhesive tape, which is prone to liquid leakage. In addition, the tab inside the battery is not easy to bend, so a novel tab structure needs to be proposed. UTILITY MODEL CONTENTS
[0005] The utility model aims to provide a novel tab structure, which changes the inner side of the tab adhesive to an arc shape, increases the space inside the battery, and increases the length of the tab adhesive on the tab insulating adhesive tape, so that the top seal head is not sealed to the adhesive tape, which is not prone to liquid leakage, and the tab inside the battery is better bent, thereby solving the problems in the above background technology.
[0006] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a novel tab structure, which includes:
[0007] a tab body and a tab adhesive installed on the tab body;
[0008] The tab body is provided with a protruding end metal strip and a welding end metal strip which are integrally formed, and the length of the welding end metal strip is greater than that of the protruding end metal strip.
[0009] Preferably, the tab body is provided with a protruding end metal strip and a welding end metal strip which are integrally formed, and the length of the welding end metal strip is greater than that of the protruding end metal strip.
[0010] Preferably, the protruding end rubber and the welding end rubber are provided with metal strip through holes on opposite sides for the protruding end metal strip to pass through, and the cross section of the protruding end rubber is rectangular.
[0011] Preferably, the tab body is a rectangular metal strip, and the cross section of the welding end rubber is trumpet-shaped.
[0012] Preferably, the length of the protruding end metal strip extending out of the battery cell is 7.8±1mm, and the length of the protruding end rubber extending out of the battery cell is 0.8±0.5mm.
[0013] Preferably, the cross section length of the protruding end metal strip is 1.5±0.1mm, and the distance between the two groups of tab bodies is 5.5±0.5mm.
[0014] Compared with the prior art, the utility model has the beneficial effects that:
[0015] 1. The utility model mainly through the cooperation between the tab body and the tab rubber, through the inside of tab rubber changes to the shape of the inner arc, this design increases the space inside the battery, makes the tab insulating tape of welding end has more folding space, thereby reduces the risk of tab insulating tape to tab rubber seal, because of the change of tab rubber shape, tab insulating tape when pasting will not cover tab rubber too much, so the top seal head when sealing will not seal on the tape, thereby reduce the risk of leakage.
[0016] 2. The utility model discloses a welding end rubber and an inner arc groove, and the inside of the tab rubber is changed to an arc, which not only increases the space inside the aluminum plastic film, but also improves the utilization rate of the battery. This design avoids the tab rubber occupying too much space in the battery, reduces the hindering effect on the diaphragm and the tab insulating tape, and makes the tab body in the battery easier to bend, thereby improving the connection effect of the welding end metal strip in the battery and the protruding end metal strip of the tab rubber outside the battery. BRIEF DESCRIPTION OF DRAWINGS
[0017] Fig. 1 It is a structure diagram of the tab body welding end of the utility model.
[0018] Fig. 2 The drawing shows the structure of the protruding end of the tab body.
[0019] In the drawing: 1, tab body; 11, protruding end metal strip; 12, welding end metal strip; 2, tab rubber; 21, protruding end rubber; 22, inner arc groove; 23, welding end rubber; 24, metal strip through hole. DETAILED DESCRIPTION
[0020] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.
[0021] Please refer to Figs. 1-2 The present application provides a technical solution: a novel tab structure, comprising:
[0022] A tab body 1 and a tab rubber 2 installed on the tab body 1;
[0023] The tab rubber 2 comprises a protruding end rubber 21, one end of the protruding end rubber 21 is integrally formed with a welding end rubber 23, both sides of the welding end rubber 23 are provided with an inner arc groove 22, the thickness of the protruding end rubber 21 is greater than the thickness of the tab body 1, and the width of the welding end rubber 23 is the same as the width of the tab body 1.
[0024] The tab body 1 comprises an integrally formed protruding end metal strip 11 and a welding end metal strip 12, the length of the welding end metal strip 12 is greater than the length of the protruding end metal strip 11, and the tab rubber 2 is located inside the aluminum plastic film, wherein the tab rubber 2 of the inner arc is designed to increase the space inside the aluminum plastic film, so as to facilitate the folding of the tab insulating rubber belt, thereby reducing the risk of the tab insulating rubber belt being attached to the tab rubber 2 seal.
[0025] The opposite side of the protruding end rubber 21 and the welding end rubber 23 is provided with a metal strip through hole 24 for the protruding end metal strip 11 to pass through, the cross section of the protruding end rubber 21 is arranged in a rectangular shape, and the inner side of the tab rubber 2 is designed in an arc shape. This design not only increases the space inside the battery, but also improves the bending performance of the tab inside the battery.
[0026] The tab body 1 is a rectangular metal strip, the cross section of the welding end adhesive body 23 is arranged in a horn shape, the tab adhesive 2 extends from the metal strip 11 (located outside the battery), and the metal strip 12 (located inside the battery) is connected with the tab adhesive 2, which optimizes the assembly process and sealing performance of the battery, and the improved shape of the tab adhesive 2 makes the top sealing head not seal on the tab insulating tape when sealing, thereby reducing the risk of battery leakage.
[0027] The length of the metal strip 11 extending out of the battery cell is 7.8±1mm, the length of the adhesive body 21 extending out of the battery cell is 0.8±0.5mm, and the battery equipped with the new tab body 1 has the effects of improving the utilization of internal space, reducing the risk of leakage, and improving the bending performance of the tab.
[0028] The cross-sectional length of the metal strip 11 is 1.5±0.1mm, the distance between the two groups of tab bodies 1 is 5.5±0.5mm, the tab adhesive 2 with an inner arc is fixed on the rectangular tab body 1, and the tab adhesive 2 is located inside the aluminum plastic film to optimize the internal space of the battery.
[0029] When in use, the arc groove on the welding end adhesive body 23 is arranged inside the aluminum plastic film, thereby increasing the space inside the aluminum plastic film, allowing the tab insulating tape attached to the welding end metal strip 12 to have a folding space, thereby reducing the risk of leakage during packaging, and through the design of the inner arc of the new tab structure, the utilization of the internal space of the battery is optimized, the sealing performance and bending performance are improved, and better performance and reliability are exhibited during installation and use.
[0030] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.
Claims
1. A novel tab structure, characterized by, The utility model relates to a battery tab structure, including: A tab body (1) and a tab rubber (2) installed on the tab body (1); The tab rubber (2) includes a protruding end rubber body (21), one end of the protruding end rubber body (21) is integrally formed with a welding end rubber body (23), both sides of the welding end rubber body (23) are provided with an inner arc groove (22), the thickness of the protruding end rubber body (21) is greater than the thickness of the tab body (1), and the width of the welding end rubber body (23) is the same as the width of the tab body (1).
2. The novel tab structure according to claim 1, characterized in that: The tab body (1) includes an integrally formed protruding end metal strip (11) and a welding end metal strip (12), and the length of the welding end metal strip (12) is greater than the length of the protruding end metal strip (11).
3. The novel tab structure according to claim 2, characterized in that: The opposite sides of the protruding end rubber body (21) and the welding end rubber body (23) are provided with metal strip through holes (24) for the protruding end metal strip (11) to pass through, and the cross section of the protruding end rubber body (21) is rectangular.
4. The novel tab structure according to claim 3, characterized in that: The tab body (1) is a rectangular metal strip, and the cross section of the welding end rubber body (23) is horn-shaped.
5. The novel tab structure according to claim 4, characterized in that: The length of the protruding end metal strip (11) extending out of the battery cell is 7.8+ / -1mm, and the length of the protruding end rubber body (21) extending out of the battery cell is 0.8+ / -0.5mm.
6. The novel tab structure according to claim 5, characterized in that: The cross section length of the protruding end metal strip (11) is 1.5+ / -0.1mm, and the distance between the two groups of tab bodies (1) is 5.5+ / -0.5mm.