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Internal cell water content test method

A test method and battery technology, which is applied in the measurement of electrical variables, material analysis through electromagnetic means, and measurement of electricity, which can solve problems such as monitoring and inaccurate battery cells

Active Publication Date: 2017-08-18
SHENZHEN TOPBAND NEW ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using the Karl Fischer moisture analyzer to evaluate the battery moisture has good reproducibility and high accuracy, but it needs to destroy and disassemble the battery and take samples for testing. The sampling environment is strict, and it is impossible to accurately monitor each battery.

Method used

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Embodiment Construction

[0028] In order to have a clearer understanding of the technical features, objects and effects of the present invention, the specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0029] A method for testing the internal moisture content of a battery, comprising the following steps:

[0030] S10. Perform constant current charging on the battery with the first current, and charge the battery until the voltage of the battery reaches the first voltage, and obtain the constant current charging amount.

[0031] Preferably, the first current is a 0.2C current. It should be known that C mentioned in this article all refers to the rate at which the charging and discharging current of the battery is the rated current.

[0032] The obtaining of the constant-current charging capacity described in this step S10 includes: obtaining the constant-current charging capacity in combination with the first current according to...

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Abstract

The invention relates to an internal cell water content test method. The method comprises steps that S10, constant current charging for a cell is carried out at a first current till a voltage of the cell reaches a first voltage, and constant current charging quantity is acquired; S20, constant voltage charging for the cell at a first voltage is carried out till a charging current reaches to a second current, and constant voltage charging quantity is acquired; S30, sum of the constant current charging quantity and the constant voltage charging quantity is the total charging quantity, and a ratio of the constant current charging quantity to the constant voltage charging quantity is calculated; and S40, an internal water content grade of the cell is acquired according to the ratio. The method is advantaged in that the internal water content of cells under one same design process can be represented through the constant current charging ratio acquired through testing, dismounting the cells is not needed, and the method is quite convenient and rapid.

Description

technical field [0001] The present invention relates to lithium-ion battery technology, and more particularly, to a method for testing the moisture content inside the battery. Background technique [0002] A lithium-ion battery is a secondary battery (rechargeable battery) that mainly relies on the movement of lithium ions between the positive and negative electrodes to work. At present, in the manufacturing process of lithium-ion batteries, the moisture in the pole pieces must be strictly controlled. The moisture in the pole pieces has a great impact on the lithium-ion battery. The electrolyte reduces the ion conductivity of the battery, which is easy to cause the failure of the lithium battery. The high moisture content in the battery can lead to various problems such as flatulence, increased polarization, capacity fading, and reduced cyclability. Therefore, in the production process of lithium-ion batteries, the humidity of the environment and the water content of the b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36G01N27/00
CPCG01N27/00G01R31/3865
Inventor 陈星武永强
Owner SHENZHEN TOPBAND NEW ENERGY CO LTD