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Soft-packaged lithium ion battery insulation test method

An ion battery and insulation testing technology, which is applied in the direction of high resistance measurement, measuring electricity, measuring devices, etc., can solve the problems of needle fatigue falling off, misjudgment of defective battery insulation, and failure of test results, etc., to improve repeatability and Accuracy, increasing accuracy and repeatability, effects of stabilizing test results

Active Publication Date: 2018-03-09
WANXIANG 123 CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the actual test process, the test results are often invalidated due to needle problems (such as needle fatigue falling off, needle wear) and aluminum-plastic film bonding force problems (the needle penetrates but cannot touc

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A method for testing the insulation of a soft pack lithium-ion battery, comprising the following steps:

[0029] Step 1. The surface of the aluminum-plastic composite film is partially frozen; take a freezing gun carrying liquid nitrogen (the aperture of the freezing head is 1mm) and spray the freezing gas from liquid nitrogen at a distance of 1.5cm from the surface of the aluminum-plastic composite film for 0.5 seconds. Form a circular freezing zone A and a circular freezing zone B with a diameter of 1 cm;

[0030] Step 2. Puncture the needle into the aluminum-plastic composite film and test the loop resistance A; take the Y-shaped needle A and the Y-shaped needle B and pierce the circular freezing area A and the circular freezing area B of the aluminum-plastic composite film of the pouch battery respectively After piercing, keep it for 5 minutes. Then, use the resistance method to test the circuit formed by needle A, needle B and aluminum-plastic composite film, and t...

Embodiment 2

[0035] A method for testing the insulation of a soft pack lithium-ion battery, comprising the following steps:

[0036] Step 1. The surface of the aluminum-plastic composite film is partially frozen; take a freezing gun carrying dry ice (the aperture of the freezing head is 0.5mm) and spray the freezing gas from the dry ice at a distance of 2cm from the surface of the aluminum-plastic composite film for 1 second to form a diameter 0.5cm circular freezing zone A and circular freezing zone B;

[0037] Step 2. Puncture the needle into the aluminum-plastic composite film and test the loop resistance A; take the cross-shaped needle A and the cross-shaped needle B and pierce the circular freezing area A and the circular freezing area B of the aluminum-plastic composite film of the pouch battery respectively After piercing, keep it for 15 minutes. Then, use the resistance method to test the circuit formed by needle A, needle B and aluminum-plastic composite film, and the measured cir...

Embodiment 3

[0040] A method for testing the insulation of a soft pack lithium-ion battery, comprising the following steps:

[0041] Step 1. The surface of the aluminum-plastic composite film is partially frozen; take a cryogun carrying liquid nitrogen (the aperture of the freezing head is 1mm) and spray the freezing gas from liquid nitrogen at a distance of 1.8cm from the surface of the aluminum-plastic composite film for 1 second. Form a circular freezing zone A and a circular freezing zone B with a diameter of 1 cm;

[0042] Step 2. Puncture the needle into the aluminum-plastic composite film and test the loop resistance A; take the cross-shaped needle A and the cross-shaped needle B and pierce the circular freezing area A and the circular freezing area B of the aluminum-plastic composite film of the pouch battery respectively After piercing, keep it for 5 minutes. Then, use the resistance method to test the circuit formed by needle A, needle B and aluminum-plastic composite film, and t...

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PUM

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Abstract

The invention discloses a soft-packaged lithium ion battery insulation test method. The method comprises the following steps of (1) locally freezing the surface of an aluminum-plastic composite film;(2) punching into the aluminum-plastic composite film by a puncture needle to test the loop resistance A; (3) testing the loop resistance B; (4) testing the insulation performances of a metal cathodelug and a soft-packaged aluminum layer. According to the invention, the test failure caused by the binding force problem between the puncture needle and the aluminum-plastic composite film is overcome. Through the method of the local freezing and the double-needle twice punching, 100% of battery insulation defective products can be tested and found out by a test terminal. The contact state of thepuncture needle and the aluminum layer is optimized and defined. The repeatability and the accuracy of the insulation test of the soft-packaged lithium ion battery are greatly improved.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery testing, and in particular relates to a method for testing the insulation of a soft-pack lithium-ion battery. Background technique [0002] After the side sealing of the soft-packed lithium-ion battery, it is necessary to test the insulation between the tab and the aluminum layer of the aluminum-plastic composite film. If the insulation between the aluminum layer of the aluminum-plastic composite film and the negative tab is poor, the negative electrode and the aluminum layer of the aluminum-plastic composite film will form an electronic short circuit. , the electrochemical reaction occurs and corrosion occurs, which affects the service life of the soft-pack lithium-ion battery. It can be seen that the insulation test of the soft-packed lithium-ion battery is an important test process in the production process of the lithium-ion battery. It is tested whether the negative tab of the sof...

Claims

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Application Information

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IPC IPC(8): G01R31/36G01R27/02
CPCG01R27/025G01R31/36
Inventor 王岩青朱伟
Owner WANXIANG 123 CO LTD