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Chemical combination method of lithium-ion recharging battery

A technology of secondary charging and formation method, which is applied in secondary battery charging/discharging, secondary battery repair/maintenance, non-aqueous electrolyte storage battery, etc. Cycle performance and other issues, to achieve the effect of reducing the degree of polarization, improving cycle performance, and increasing migration rate

Inactive Publication Date: 2010-10-27
CHERY AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The prior art most related to the present invention is the technical solution disclosed in the patent publication number CN181591C. Although this patent has the advantages of preventing battery bulging and inflation, easy control of battery thickness, and good safety performance, it has low electrolyte residual and capacity, low rate discharge performance, low cycle performance, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Closed formation is adopted, and the temperature of closed formation is preferably 35-60°C. The battery is firstly charged with a constant current in three stages, and then charged with a constant voltage. There is a time interval between each charging stage. Three constant current charges Different charging currents are used in different stages, and the charging current increases sequentially.

[0020] In the first stage, the constant current charging current is 0.02C (C is the battery capacity), and the charging cut-off voltage is 2.2V; in the second stage, the constant current charging current is 0.12C, and the charging cut-off voltage is 3.1V; in the third stage, constant current charging The current is 0.2C, and the charging cut-off voltage is 3.7V. The charging voltage in the constant voltage charging stage is 3.7V, and the cut-off current is 0.01C. The time interval between each charging stage is 5 to 15 minutes, and the latter interval is longer than the former...

Embodiment 2

[0022] In the first stage, the constant current charging current is 0.03C, and the charging cut-off voltage is 2.3V; in the second stage, the constant current charging current is 0.14C, and the charging cut-off voltage is 3.2V; in the third stage, the constant current charging current is 0.2C, The cut-off voltage is 3.8V. The charging voltage in the constant voltage charging stage is 3.8V, and the cut-off current is 0.01C. The remaining steps are the same as in Embodiment 1.

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Abstract

The invention relates to a chemical combination method of a lithium-ion recharging battery, which can be used for preparing the lithium-ion recharging battery with high electrolyte residual quantity, capacity, multiplying power discharge performance and circulating performance. The chemical combination method has the technical scheme that closed chemical combination is adopted, the battery is charged in three stages in a constant-current way, and the battery is then charged in a constant-voltage.

Description

technical field [0001] The invention relates to a method for forming a lithium ion secondary rechargeable battery. Background technique [0002] Before the battery is used, it must be chemically formed in order to activate the active materials of the positive and negative electrodes of the battery, so that the battery can reach the best state of charge and discharge. The formation step of lithium-ion rechargeable batteries is an important stage in the manufacture of batteries. The formation is related to the quality of the battery's capacity, cycle life, and safety performance. Formation is the process of charging a battery for the first time. [0003] The prior art most related to the present invention is the technical solution disclosed in the patent publication number CN181591C. Although this patent has the advantages of preventing battery bulging and inflation, easy control of battery thickness, and good safety performance, it has low electrolyte residual And capacity,...

Claims

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Application Information

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IPC IPC(8): H01M10/44H01M10/058
CPCY02E60/10Y02P70/50
Inventor 张雷
Owner CHERY AUTOMOBILE CO LTD
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