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Secondary battery leakage detection method

A secondary battery and leak detection technology, which is applied in secondary battery repair/maintenance, battery/battery leak test, and by detecting the appearance of fluid at the leak point, etc., can solve the problems of low detection efficiency, high price, equipment and environment Require high-level problems to achieve the effect of high detection rate, high sensitivity and short time

Inactive Publication Date: 2018-03-16
HUNAN LIFANG NEW ENERGY SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent CN201520158858 provides a positive and negative pressure leak detection method, suitable for leak detection of batch batteries, suitable for batteries with serious leakage, and low detection efficiency for batteries with subtle defects
In addition, helium detection methods have appeared in recent years, such as patents CN201320619362 and CN201710125397. This method has the characteristics of high detection rate, but this method has high requirements on equipment and environment, is expensive, and has low detection efficiency.

Method used

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  • Secondary battery leakage detection method

Examples

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Effect test

Embodiment 1

[0024] This embodiment provides a battery leak detection method, including the following steps:

[0025] Step 1, dissolving the mixed gas containing 5% helium in the electrolyte solution by high-pressure method, then injecting the electrolyte solution into the battery and completing the packaging of the battery;

[0026] Step 2, place the battery obtained in Step 1 in a closed container equipped with a helium gas spectrometer, evacuate the container to a vacuum degree of -20Kpa, keep the pressure for 120s, and then fill it with air, and cycle 2 times like this;

[0027] Step 3, turn on the helium gas spectrometer, check the gas extracted from the airtight container, and judge whether the battery has liquid leakage according to whether helium gas is detected.

Embodiment 2

[0029] This embodiment provides a battery leak detection method, including the following steps:

[0030] Step 1, dissolving the mixed gas containing 10% halogen elemental gas in the electrolyte solution by high-pressure method, then injecting the electrolyte solution into the battery and completing the packaging of the battery;

[0031] Step 2, place the battery obtained in Step 1 in a closed container equipped with a halogen mass spectrometer, evacuate the container to a vacuum degree of -40Kpa, and keep the pressure for 100s, then fill it with nitrogen, and cycle 2 times like this;

[0032] Step 3, turn on the halogen mass spectrometer, check the gas extracted from the airtight container, and judge whether the battery has liquid leakage according to whether the halogen elemental gas is detected.

Embodiment 3

[0034] This embodiment provides a battery leak detection method, including the following steps:

[0035] Step 1, dissolving the mixed gas containing 15% halogen elemental gas in the electrolyte solution by high-pressure method, then injecting the electrolyte solution into the battery and completing the packaging of the battery;

[0036] Step 2, place the battery obtained in Step 1 in a closed container equipped with a halogen mass spectrometer, evacuate the container to a vacuum degree of -60Kpa, keep the pressure for 80s, and then fill it with argon, and cycle 3 times like this;

[0037] Step 3, turn on the halogen mass spectrometer, check the gas extracted from the airtight container, and judge whether the battery has liquid leakage according to whether the halogen elemental gas is detected.

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Abstract

The invention provides a secondary battery leakage detection method. The method comprises the following steps that: 1, a tracer gas is dissolved in an electrolyte through a high-pressure method, thenthe electrolyte is injected into a battery, and the battery is packaged; 2, the battery obtained in the step 1 is placed in a closed container provided with a leakage detection instrument, the container is vacuumized and is subjected to pressure maintaining, and then, the container is filled with a gas, and vacuumizing, pressure maintaining, and gas filling are performed circularly; and 3, the leakage detection instrument is turned on to check the gas extracted from the closed container, and whether liquid leakage occurs on the battery is judged according to a fact that whether the tracer gasis detected out or not. Compared with the prior art, the method of the present invention can conveniently and quickly screen out batteries having pinholes, unpackaged batteries, packaged batteries with leakage defects, and damaged batteries, so that potential safety hazards caused by a condition that defective batteries having liquid leakage risks flow to clients can be avoided.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a leak detection method for a secondary battery. Background technique [0002] In the process of secondary battery manufacturing, the following conditions may cause battery leakage: 1) Insufficient battery circulation protection will cause defects such as battery surface damage and pinholes; 2) Battery packaging is incomplete due to equipment and personnel factors , there are leak seals, unpackaged, etc.; 3) The battery has leakage channels due to process problems. It should be noted that, on the one hand, electrolyte leakage will cause battery performance to decline; on the other hand, it will cause terminal corrosion, and defective channels will cause safety hazards, such as LiPF 6 The electrolyte absorbs water through defective channels, causing the battery to gas. [0003] In order to avoid the impact of electrolyte leakage on the electrochemical performance a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M3/20H01M10/42
CPCG01M3/20H01M10/4228Y02E60/10
Inventor 朱登伟
Owner HUNAN LIFANG NEW ENERGY SCI & TECH
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