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Tab and method for manufacturing same and lithium ion battery comprising the tab

A technology of tabs and tabs, applied to battery electrodes, battery pack components, circuits, etc., can solve problems such as poor adhesion, insufficient toughness, scratches, etc., and achieve improved safety performance and excellent adhesive performance , to avoid the effect of damage

Inactive Publication Date: 2007-07-04
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the tape itself has two defects: 1. The toughness is not enough, and it is easily scratched by the burrs on the edge of the tab, causing a short circuit in the contact between the tab and the shell; 2. The electrolyte soaks the tape for a long time, causing the tape to fall off from the tab. Cause a short circuit in the contact between the tab and the shell
The purpose of the invention of CN1540785A is to prevent the battery electrolyte from leaking out due to the problem of poor adhesion when the positive and negative metal tabs are heat-bonded with the aluminum-plastic composite film during the manufacture of the flexible-packaged lithium-ion battery, rather than heat-fused The adhesive film is directly heat-sealed on the tab to protect the insulation of the tab, and there is also a problem of cohesion when bonding with an adhesive
For the tabs of lithium-ion batteries, there is a problem that the tabs are easy to contact with the shell and cause a short circuit, which poses a safety hazard.

Method used

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  • Tab and method for manufacturing same and lithium ion battery comprising the tab
  • Tab and method for manufacturing same and lithium ion battery comprising the tab
  • Tab and method for manufacturing same and lithium ion battery comprising the tab

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0036] This example is used to illustrate the manufacturing method of the tab of the lithium ion battery provided by the present invention.

[0037] Adopt the pole piece in comparative example 1, difference is according to the tab manufacturing method provided by the present invention, the width of pole tab 2 as shown in Figure 2 is 3 millimeters, and length H is 24 millimeters, is connected with electrode piece 9 The length A of the connection part is 12 mm, and the length D of the connection part connected with the connection piece 7 of the battery terminal is 2.5 mm. The width of the hot melt adhesive film 1 is 9 mm, and the length is 9.5 mm. Put two such hot-melt adhesive films 1 on the upper and lower sides of the non-connecting part of the tab piece 2, clamp the tab piece 2, and then use the pressurized module 5 at a temperature of 150 degrees Celsius and a pressure of 0.08 MPa. Press the hot-melt adhesive film 1 up and down for 10 seconds, then take out the tab piece 2...

example 2

[0039] This example is used to illustrate the manufacturing method of the tab of the lithium ion battery provided by the present invention.

[0040] According to the method described in Example 1, the hot melt adhesive film 1 is wrapped on the tab piece 2. The difference is that when hot pressing, the extra width of the two sides measured with a millimeter ruler is 3 mm. The hot melt adhesive film 1 is placed outside the heating module 5 . The part of the excess hot-melt adhesive film 1 is not hot-pressed.

[0041] The following examples are used to illustrate the characteristics of the hot melt adhesive film of the present invention.

example 3

[0043]The tabs hot-pressed with hot-melt adhesive film and the tabs wrapped in adhesive tape prepared in Example 1 and Comparative Example 1 were respectively soaked in the same lithium-ion battery electrolyte. After sealing, place them at room temperature and 50 degrees Celsius respectively, observe their corrosion resistance and shedding after 10 months, and compare the differences between them. Wherein, the electrolyte is a commonly used electrolyte in the field, which is a mixed solution of electrolyte lithium salt and non-aqueous solvent. Among them, the electrolyte lithium salt is selected from lithium hexafluorophosphate (LiPF6), lithium hexafluoroarsenate, lithium halide, lithium chloroaluminate and lithium fluoroalkyl sulfonate; the organic solvent is a mixed solution of chain ester and cyclic ester, wherein the chain The esters are dimethyl carbonate (DMC), diethyl carbonate (DEC), and the cyclic esters are ethylene carbonate (EC), propylene carbonate (PC), vinylene ...

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Abstract

The invention relates to a pole ear, its manufacturing method and the lithium ion battery including the pole ear. Among them, the said pole ear includes the pole ear slide, in which the pole ear also includes the hot melt adhesive membrane, and the hot melt adhesive membrane directly hot pressing the outer surface of the pole ear slide. Among them, the said battery pole ear manufacturing method includes the following steps: according to the pole ear slide size, intercepting the hot melt adhesive membrane size; using two hot melt adhesive membranes clamping the pole ear slide; using heating module to heat up-and-down the hot melt adhesive membrane clamping the pole ear slide; cooling the pole ear slide after hot pressing. This invention provides the pole ear, and since the hot melt adhesive membrane can be firmly attached the pole ear slide together, and two hot melt adhesive membranes integrate together after hot melt, and form to a sealing plastic slide after cooling, it ensures the insulation of the pole ear slide, effectively avoid the original short circuit caused by the adhesive plaster's broken or fallen, and then cause the battery fever, swell, or even explosion, so it greatly enhanced the safety performance of the lithium ion battery.

Description

technical field [0001] The invention relates to a tab, a manufacturing method thereof and a lithium ion battery comprising the tab. Background technique [0002] At present, the insulation device used as the tab of the lithium-ion battery is mainly adhesive tape. However, the tape itself has two defects: 1. The toughness is not enough, and it is easily scratched by the burrs on the edge of the tab, causing a short circuit in the contact between the tab and the shell; 2. The electrolyte soaks the tape for a long time, causing the tape to fall off from the tab. Cause a short circuit in the contact between the tab and the shell. This causes safety problems such as heating, drumming, and even explosion of the battery. [0003] CN1540785A discloses a method for making soft-packed lithium-ion battery tabs. On the metal pole piece at the heat-sealing position of the aluminum-plastic composite film, an aluminum foil with an outer hot-melt adhesive film is pasted with an adhesive t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/22H01M2/24H01M2/26H01M2/06H01M4/00H01M50/528H01M50/172H01M50/529H01M50/531
CPCY02E60/12Y02E60/10
Inventor 王建军肖伟
Owner BYD CO LTD
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