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Method for testing sealing property of battery, and method for testing quality of battery

A technology for sealing and testing batteries, applied in the field of materials, which can solve problems such as expansion and volume expansion

Active Publication Date: 2019-07-26
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The inventor conducted in-depth investigations and a large number of experimental verifications on the phenomenon that the cycle performance of batteries that have passed the airtightness test in the related art will become poorer than that of batteries that have not passed the airtightness test. High-energy-density battery negative electrodes (such as silicon-carbon negative electrodes) have certain volume expansion problems during charging and discharging. For example, during the charging and discharging process of silicon-carbon negative electrodes, the volume of silicon will expand by 100% to 300%.

Method used

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  • Method for testing sealing property of battery, and method for testing quality of battery

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Embodiment Construction

[0024] Embodiments of the present invention are described in detail below. The embodiments described below are exemplary only for explaining the present invention and should not be construed as limiting the present invention. If no specific technique or condition is indicated in the examples, it shall be carried out according to the technique or condition described in the literature in this field or according to the product specification. The reagents or instruments used were not indicated by the manufacturer, and they were all commercially available conventional products.

[0025] In one aspect of the invention, the invention provides a method of testing the hermeticity of a battery. According to an embodiment of the present invention, refer to figure 2 , the method includes the following steps:

[0026] S100: Perform a first vacuum treatment on the battery preform to be tested.

[0027] According to the embodiment of the present invention, it should be noted that the pr...

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Abstract

The invention provides a method for testing the sealing property of a battery, and a method for testing the quality of the battery. The method for testing the sealing property of the battery comprisesthe following steps: performing a first vacuum treatment on a battery preform to be tested; performing an inflation treatment on the battery preform to be tested subject to the first vacuum treatment, comprising performing a second vacuum treatment on the battery preform to be tested after injecting a gas to be detected into the battery preform to be tested; performing a sealing treatment on thebattery preform to be tested subject to the second vacuum treatment to obtain a battery to be tested; detecting whether the gas to be detected leaks from the battery to be tested to obtain the sealingproperty of the battery to be tested; if no gas to be detected leaks from the battery to be tested, indicating that the sealing property of the battery to be tested is good; and if the gas to be detected leaks from the battery to be tested, indicating that the sealing property of the battery to be tested is not good. The method is simple and convenient to operate and is easy to implement, the battery after the sealing property is tested still has a relatively high vacuum degree, so that the battery is unlikely to generate expansion in a charging and discharging process, and the cycle performance of the battery is not affected.

Description

technical field [0001] The invention relates to the technical field of materials, in particular to a method for testing battery sealing and a method for testing battery quality. Background technique [0002] At present, as people's awareness of environmental protection continues to increase, electric vehicles will gradually replace fuel vehicles, and the main power of electric vehicles comes from batteries, among which lithium-ion batteries are currently one of the most important power sources for electric vehicles. After the lithium-ion battery is produced and before it reaches consumers, a series of performance tests are required to ensure the safety of the battery to the greatest extent and reduce potential safety hazards. Among them, testing the sealing of the battery is a very important item. test. As we all know, when the battery leaks, there will be many problems such as electrolyte volatilization, moisture infiltration, swelling, etc., which will lead to poor batter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M3/20
CPCG01M3/202G01M3/226
Inventor 冯旭东伍尤兵张伟赵柯迪陈冠宇
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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