Formation method of lithium ion battery

A lithium ion battery and a technology of a chemical formation method, which are applied in the field of polymer lithium ion battery manufacturing, can solve the problems of poor consistency of the interface state of the positive and negative electrode sheets of the battery, insufficient battery hardness, and uneven appearance of the battery, and reduce the Appearance defect rate and scrap rate, long-term cycle capacity improvement, and the effect of solving the long-term formation cycle
CN105406129AActive Publication Date: 2016-03-16ZHUHAI COSMX BATTERY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
ZHUHAI COSMX BATTERY CO LTD
Publication Date
2016-03-16

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Abstract

A formation method of a lithium ion battery comprises the following steps of placing an aged battery in a formation device for formation in a high-temperature pressurized environment, charging by using 0.1-0.5CmA current during charging until to a cut-off voltage of 3.7V, and then charging by using 0.5-2.0CmA current until to a cut-off voltage of 4.0V; increasing the temperature and keeping the pressure unchanged, and carrying out heat preservation and pressure maintaining on the battery; reducing the temperature and the pressure, and cooling the battery; and carrying out vacuum pumping and secondary sealing on the battery subjected to cooling finish, and completing formation. According to the formation method, a battery core is placed in a high temperature and certain pressure condition for large-current charging formation, the processing time is shortened, and the production efficiency is improved; moreover, the contact of an operator to the lithium battery core is reduced, and the cost problems caused by poor appearance, damage and the like are reduced; and the consistencies on the thickness, the capacity and pole piece interface states of the battery are higher, and the cycle ability is improved.
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Description

technical field

[0001] The invention belongs to the technical field of polymer lithium-ion battery manufacturing, and in particular relates to a chemical formation method capable of improving the interface state of positive and negative electrodes of lithium-ion batteries and solving the problem of gelation of liquid electrolyte. Background technique

[0002] The battery needs to go through a formation process before use, so as to activate the active materials of the positive and negative electrodes of the battery, so that the battery can reach the best charge and discharge state. The formation of the battery generally refers to the first charge of the battery. The formation process is related to the quality of the battery capacity, cycle life and safety performance. Therefore, the formation process determines the performance of the battery to a certain extent.

[0003] The existing chemical formation process is generally to continuously charge the battery at room temperatur...

Claims

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