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Method for pre-charging lithium ion batteries

A lithium-ion battery and pre-charging technology, which is applied in the direction of secondary battery charging/discharging, secondary batteries, battery electrodes, etc., can solve the problems of low charging and discharging efficiency, poor electrolyte compatibility, and low voltage platform, and achieve improved Production efficiency, excellent electrical performance, and the effect of saving production costs

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

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Problems solved by technology

However, this material has defects such as low voltage platform, low charge and discharge efficiency, and poor electrolyte compatibility. Most of the research on this type of material uses low rate charge and discharge, and the low rate will seriously affect the material of this system. Therefore, the traditional lithium cobalt oxide pre-charging method is still used for pre-charging, that is, charging with a small current for a long time, which has become a key link that currently restricts the production efficiency and product performance of this material system.

Method used

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  • Method for pre-charging lithium ion batteries
  • Method for pre-charging lithium ion batteries
  • Method for pre-charging lithium ion batteries

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Embodiment 1

[0029] 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 for 0.05C, 10min; 0.3C, 50min pre-charging The method is to pre-charge, then go to the cabinet to measure the voltage, refill 10% of the liquid, squeeze the battery and complete the sealing, the above process steps are all carried out in the same temperature and humidity environment, the temperature is ≤26 °C; the humidity is ≤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.

[0030] Among them, the purpose of testing the voltage is to investigate whether there...

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Abstract

The invention discloses a method for pre-charging lithium ion batteries, positive electrode active materials of which are made of mixed materials of lithium cobalt oxide and lithium nickel cobalt oxide. The method adopts phase-type charging, comprising at least two charging steps. The charging current of the second charging step is larger than that of the first charging step, and the total pre-charging amount of the first charging step and the second charging step is 25%-45% of the total lithium ion battery capacity. The pre-charging method of the invention can greatly reduce the pre-charging time and significantly improve the production efficiency.

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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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/44H01M10/36H01M10/40H01M4/58
CPCY02E60/12Y02E60/10
Inventor 滕鑫何伟何名饶汝宇
Owner SHENZHEN BAK BATTERY CO LTD
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