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Pre-charging method of lithium ion battery with cobalt acid lithium as positive active material

A cathode active material, lithium-ion battery technology, applied in secondary battery charging/discharging, secondary battery, secondary battery repair/maintenance, etc., can solve problems such as low production efficiency, improve production efficiency, shorten pre-charging effect of time and excellent electrical performance

Inactive Publication Date: 2010-07-21
SHENZHEN BAK BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the long formation step leads to low production efficiency

Method used

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  • Pre-charging method of lithium ion battery with cobalt acid lithium as positive active material
  • Pre-charging method of lithium ion battery with cobalt acid lithium as positive active material
  • Pre-charging method of lithium ion battery with cobalt acid lithium as positive active material

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Embodiment 1

[0023] The specific process steps are as follows: first inject liquid into the sample cell, and the liquid injection volume is 85% of the process requirement, then age the cell for 1 to 2 hours, and then go to the pre-charging cabinet to pre-charge at 0.05C, 10min; 0.3C, 20min The method is to precharge, then go to the cabinet to measure the voltage, refill 15% of the liquid again, squeeze the battery cell and complete the sealing, the above process steps are all carried out in the same temperature and humidity environment, temperature ≤ 26 ° C; humidity ≤ 2% . At room temperature, measure the size of the sealed battery cell after cleaning, and measure the battery cell after aging for 6 days. The capacity classification system is based on the parameters shown in Table 2. Investigate its capacity, internal resistance, 3.92V size and cycle performance test, the results are shown in Table 3.

[0024] Among them, the purpose of testing the voltage is to investigate whether there ...

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Abstract

The invention discloses a pre-charging method of a lithium ion battery with cobalt acid lithium as a positive active material, which adopts staged charging, and comprises at least two charging steps, wherein charging current of a second charging step is larger than the charging current of a first charging step, and the total pre-charging quantity of the first charging step and the second charging step is 10%-34% of the total electric quantity of the lithium ion battery. The pre-charging method of the invention can greatly shorten the pre-charging time and greatly improve the production effect.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a precharging method for lithium ion batteries. Background technique [0002] At present, the application of lithium-ion batteries is becoming more and more extensive, and the demand for batteries is increasing. For battery manufacturers, on the one hand, they must improve production efficiency to meet market needs. efficiency. With the mechanization of production in the lithium battery industry, the pre-charging process has become a key link that currently restricts production speed and product quality. [0003] For lithium-ion batteries, when pre-charging is the initial charging, due to the electrochemical reaction, a passivation thin layer covering the surface of the carbon electrode is inevitably formed on the phase interface between the carbon negative electrode and the electrolyte, and this thin layer is a solid. Electrolyte interface (solid electrolyte inte...

Claims

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Application Information

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IPC IPC(8): H01M10/44H01M10/36H01M10/40
CPCY02E60/12Y02E60/10
Inventor 滕鑫何伟何名饶汝宇
Owner SHENZHEN BAK BATTERY CO LTD
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