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Test fixture, test device and test method for short circuit in battery

A short-circuit test and test method technology, applied in the field of lithium-ion batteries, can solve the problems of undetectable short-circuit, insufficient compactness, and affecting test accuracy, etc., to increase the probability of short-circuit detection, improve quality, and improve short-circuit detection The effect of the probability of

Pending Publication Date: 2020-04-03
HUIZHOU LIWINON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, in the process of internal short-circuit testing of lithium-ion batteries, a jig composed of two splints is generally used to directly fix the battery, but the force between the traditional jig and the battery is surface, and in order to reduce the anode and cathode of the battery The problem of powder falling, usually the pressure on the pressure plate is small, resulting in insufficient tightness between the anode sheet, cathode sheet and separator inside the battery during the test, especially when the separator is folded, the anode sheet and cathode sheet If the distance between the chips increases, sometimes the short circuit cannot be detected, which seriously affects the accuracy of the test.

Method used

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  • Test fixture, test device and test method for short circuit in battery
  • Test fixture, test device and test method for short circuit in battery
  • Test fixture, test device and test method for short circuit in battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Such as Figure 1~2 As shown, a battery internal short-circuit test fixture includes a first pressing plate 1 and a second pressing plate 2, the first pressing plate 1 and the second pressing plate 2 are arranged oppositely, and one of the first pressing plate 1 and the second pressing plate 2 is arranged oppositely A raised layer 3 is provided on the surface. The present invention effectively improves the force on the surface of the battery by providing the raised layer 3 on the first press plate 1 or the second press plate 2, and when the battery is pressed together, the pressure inside the battery is kept constant. The pressure increases, thereby improving the tightness of the pressing between the anode sheet, cathode sheet and separator inside the battery, and greatly improving the probability of short circuit detection.

[0040]Preferably, the protruding layer 3 includes a plurality of bumps 31 , and the plurality of bumps 31 are evenly arranged. The bump 31 is u...

Embodiment 2

[0043] Such as image 3 As shown, the difference from Embodiment 1 is that in this embodiment, a raised layer 3 is provided on the two opposite faces of the first press plate 1 and the second press plate 2, and other structures are the same as in Embodiment 1, here No longer.

[0044] In this embodiment, by arranging the raised layer 3 on both the first press plate 1 and the second press plate 2, compared with the single-layer structure, both the stress-bearing surfaces of the battery can be improved, so that the pressing effect can be improved. better.

Embodiment 3

[0046] Such as Figure 4~5 As shown, the difference from Embodiment 1 is that the protruding layer 3 in this embodiment includes a plurality of ridges 32 , and the plurality of ridges 32 are arranged in parallel. Other structures are the same as those in Embodiment 1, and will not be repeated here.

[0047] In this embodiment, the protruding layer 3 is a plurality of convex strips 32 arranged in parallel, which improves the stress on the battery surface to a linear force, so it can also increase the pressure of the battery during pressing, effectively improving the stability of the battery. The tightness of the inner anode sheet, cathode sheet and diaphragm.

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Abstract

The invention belongs to the technical field of lithium ion batteries. The invention particularly relates to a battery internal short circuit test fixture. The device comprises a first pressing plateand a second pressing plate, the first pressing plate and the second pressing plate are oppositely arranged; at least one surface, opposite to each other, of the first pressing plate and the second pressing plate is provided with a convex layer; compared with the prior art, according to the invention, the convex layer is arranged on the first pressing plate and / or the second pressing plate. According to the invention, the stress condition of the surface of the battery is effectively improved, and the pressure in the battery is increased under the condition that the pressure is kept unchanged when the battery is pressed, so that the pressing tightness among the anode plate, the cathode plate and the diaphragm in the battery is improved, the probability of short-circuit detection is greatlyimproved, and the test precision is improved. In addition, the invention also discloses a battery internal short circuit test device and a test method thereof.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a battery internal short-circuit test fixture, a test device and a test method thereof. Background technique [0002] As a new generation of high-efficiency green energy, lithium-ion batteries are widely used in various industries because of their advantages such as high working voltage, high energy density, long cycle life, and no memory. [0003] Lithium-ion batteries need to be formed during the production process to activate the battery, and a short-circuit test is required before activation, mainly to prevent the battery from short-circuiting during the activation process, which may cause the risk of fire and combustion. At present, in the process of internal short-circuit testing of lithium-ion batteries, a jig composed of two splints is generally used to directly fix the battery, but the force between the traditional jig and the battery is surface...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/385G01R31/52
CPCG01R31/385
Inventor 梁瑾杨山陈杰郑明清李载波
Owner HUIZHOU LIWINON NEW ENERGY TECH CO LTD