Screening method for lithium-ion battery consistency

A technology of a lithium-ion battery and a screening method, which is applied in the field of battery testing, can solve the problems of battery over-discharge, large differences in the consistency of single cells, and over-charging, and achieves the effect of improving the use efficiency.

Inactive Publication Date: 2013-09-18
高平唐一新能源科技有限公司
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Problems solved by technology

[0004] Batteries selected by limiting the capacity range, limiting internal resistance range, and limiting voltage drop at different temperatures can ensure consistent initial performance and self-discharge performance of the battery. It has not been verified whether the charging and discharging of the battery during use are synchronized, and cannot be guaranteed. Consistent decay rate during use
The reason is that the existing battery screening methods cannot reflect the DC internal resistance and polarization internal resistance of the single battery, and the consistency of the battery is flawed.
[0005] Lithium-ion battery packs are composed of multiple single cells connected in series and parallel. However, due to the differences in the performance of each single cell, the perform

Method used

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  • Screening method for lithium-ion battery consistency
  • Screening method for lithium-ion battery consistency
  • Screening method for lithium-ion battery consistency

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[0025] Method concrete steps of the present invention are as follows:

[0026] Screen out lithium-ion single batteries produced under the same conditions, that is, the raw material composition of the battery and the preparation process of the battery must be consistent;

[0027] Screen the appearance of the battery: the battery must have no flatulence, no leakage, no scratches on the surface, and the appearance and size are qualified, and the batteries with qualified appearance are screened out;

[0028] Put the screened qualified batteries at room temperature at 20-30°C for a preset time: 14-28 days;

[0029] According to the capacity, internal resistance and voltage drop of the single battery under different environments of high temperature: 40-60 °C, low temperature: -40-0 °C or normal temperature: 20-30 °C, statistics and screening are carried out;

[0030] Measure the capacity, internal resistance and voltage drop of the battery to be screened under different temperature...

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Abstract

The invention relates to the technical field of the detection of a battery, and in particular relates to a screening method for lithium-ion battery consistency. The method is characterized in that the screening is carried out according to the limit capacity, the limit internal resistance and the limit voltage droop in a high-temperature environment, a low-temperature environment or a normal-temperature environment of a single battery; the battery is charged and discharged, so that the screening can be further carried out by comparing the variation of the capacity, the voltages and the currents in the charging and discharging processes, the application efficiency of the single battery can be improved, the service life of the single battery can be prolonged, and the safety of the single battery can be improved.

Description

technical field [0001] The invention relates to the technical field of battery detection, in particular to a screening method for consistency of lithium-ion batteries. Background technique [0002] At present, the green power source with high energy density, long service life and good safety performance - lithium-ion battery is widely used. Lithium-ion batteries are widely used in energy storage, power and other fields. The test found that the service life of the battery pack is lower than that of the single battery for the same battery, which shows that the consistency of the battery obviously affects the service life of the battery. In the series-parallel application of batteries, the consistency of batteries affects the efficiency and life of batteries, and safety issues also have an impact. Therefore, the requirements for the consistency of the single cells assembled into a battery pack should be more stringent. [0003] To ensure the consistency of the battery, first...

Claims

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Application Information

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IPC IPC(8): B07C5/344
Inventor 赵章宏郭静斐李良学
Owner 高平唐一新能源科技有限公司
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