Test method for moisture content inside batteries
A test method and battery technology, applied in the direction of measuring electrical variables, material analysis through electromagnetic means, and measuring electricity, can solve problems such as monitoring and inaccurate battery cells
Active Publication Date: 2019-08-16
SHENZHEN TOPBAND NEW ENERGY CO LTD
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- Abstract
- Description
- Claims
- Application Information
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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.
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[0028] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners of the present invention will now be described in detail with reference to the accompanying drawings.
[0029] A method for testing the moisture content inside a battery, comprising the steps of:
[0030] S10. Perform constant current charging on the battery with the first current until the voltage of the battery reaches the first voltage to obtain a constant current charging amount.
[0031] Preferably, the first current is 0.2C current. It should be known that the C mentioned in this article refers to the ratio of the battery charge and discharge current to the rated current. For example, if a 50Ah battery is discharged at a current of 0.1C, it means that the discharge current is 50*0.1=5A.
[0032] Obtaining the constant current charging amount in step S10 includes: obtaining the constant current charging amount accor...
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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 invention relates to lithium ion battery technology, more specifically, relates 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 works primarily by moving lithium ions between the positive and negative electrodes. At present, in the manufacturing process of lithium-ion batteries, the moisture in the pole piece must be strictly controlled. The moisture in the pole piece has a great impact on the lithium-ion battery, mainly because the moisture inside the battery will react with the electrolyte inside the battery, consuming The electrolyte will reduce the ion conductivity of the battery and easily cause the failure of the lithium battery. High moisture content in the battery will lead to many problems such as battery flatulence, increased polarization, capacity decay, and reduced cycle performance. Therefore, in the production proc...
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IPC IPC(8): G01R31/385G01N27/00
CPCG01N27/00G01R31/3865
Inventor 陈星武永强
Owner SHENZHEN TOPBAND NEW ENERGY CO LTD