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A multi-step synthesis method for improving capacity consistency of old power lithium batteries

A chemical formation method and lithium battery technology, which is applied in the field of power lithium battery cascade utilization, can solve problems such as poor consistency, reduced consistency, and impact, and achieve the effect of restoring the nominal capacity

Active Publication Date: 2019-06-18
杜文龙
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The application of energy storage to lithium batteries is also used on a large scale, that is, when they are used, many are only used together. It is also the same as the use of lithium batteries in new energy vehicles, facing the problem of matching and consistency. Therefore, power lithium batteries Consistency is a very important issue for secondary utilization. If the consistency is not good, if you cannot match groups, the utilization rate will be extremely low, which will affect the efficiency of use.
Even if it is barely used, due to poor consistency, it will have an impact on the performance, life and safety of the use
However, after the power lithium battery is used in new energy vehicles, its consistency will be reduced, which will bring obstacles to the secondary use, affect the utilization rate, and thus affect the benefits of the enterprises that use the power lithium battery for secondary use

Method used

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Embodiment Construction

[0016] The present invention will be further described below in conjunction with embodiment:

[0017] A multi-step formation method for improving capacity consistency of an old power lithium battery, performed in the following steps:

[0018] (a) Charge the old power lithium battery to a constant current of 0.02A to 0.5A to a voltage of 3.0V to 3.5V, and then let it stand for 30 minutes;

[0019] (b) Charge the battery with a constant current of 0.15A to a voltage of 3.5V to 3.9V, and then let it stand for 30 minutes;

[0020] (c) Charge again under the condition of constant current of 0.02A~0.5A. If it cannot be charged, reduce the charging current until the charging current reaches 0.02A and the voltage reaches 3.9V~4.3V, and then stand for 30min ,

[0021] (d) Discharge with a current of 1A to a voltage of 2.75V ~ 3.3V, and then let it stand for 30min.

[0022] (e) Charge it to a voltage of 3.7V~4.3V under the condition of 1A constant current, and then let it stand for 3...

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Abstract

The invention discloses a multi-step formation method for improving capacity consistency of a waste power lithium battery, and belongs to the field of battery formation. The multi-step formation method comprises the steps of performing constant-current cycle charging for seven times, wherein the current of each stage is different during multi-step charging; and performing high-temperature aging under a high-voltage state to obtain the waste power lithium battery with capacity consistency, wherein the high-temperature aging temperature is 40-60 DEG C, the high-voltage range is 3.90-4.00V, and the aging time is 40-60 hours. By the multi-step formation method, the nominal capacity of the waste power lithium battery can be restored, an aging curve is balanced, so that the consistency of the waste power battery is effectively restored.

Description

technical field [0001] The invention belongs to the field of cascade utilization of power lithium batteries, in particular to a multi-step formation method for improving capacity consistency of old power lithium batteries. Background technique [0002] Power lithium batteries refer to lithium-ion batteries for new energy vehicles (currently only referring to new energy vehicles announced by the Ministry of Industry and Information Technology). Generally, the monomers are relatively large. Except for a few cylindrical lithium batteries, they are basically above 10 ampere hours. There are 500 amp-hour monomers. Good magnification and good discharge are required, and both specific energy and energy density are required to save the weight and volume of new energy vehicles. In particular, such lithium batteries are required to have good consistency in terms of capacity, voltage, internal resistance and discharge, so as to meet the requirements of new energy vehicles for the scal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/54H01M10/44
CPCH01M10/446H01M10/448H01M10/54Y02E60/10Y02W30/84
Inventor 杜文龙
Owner 杜文龙
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