一种动力锂离子电池的化成方法

Formation method for power lithium ion battery

Abstract

本发明公开了一种动力锂离子电池的化成方法,是以钛酸锂为负极、以磷酸铁锂为正极,采用闭口化成方式,具体步骤为:先分三个阶段对电池进行恒流充电,再对电池进行恒压充电,在恒压充电至截止电流后,将电池放入注液手套箱中,打开注液口,真空抽去电池内产生的气体后再密封注液口。本发明实施例所述方法能有效的促使负极表面形成致密且稳定的SEI膜,化成过程中采用闭口化成的方式,避免了电池内部吸水而造成水分与电解液发生反应,影响电池性能的问题,且在恒压充电至截止电流后,真空抽去电池内产生的气体后再密封注液口,有效的改善电池壳体内部环境,避免了电池在使用过程中电池产生鼓胀及延缓电池的性能衰减,提高电池电性能及安全性能。
The invention discloses a formation method for a power lithium ion battery. With the method, lithium titanate is adopted as a cathode, lithium iron phosphate is adopted as an anode, and a sealed formation method is adopted. The method comprises the following concrete steps: adopting a three-stage charging treatment to carry out constant current charging for a battery; then carrying out constant voltage charging for the battery; placing the battery in a liquid injecting glove box after the voltage of the battery is the cut-off voltage during the constant voltage charging; opening a liquid injecting port, vacuum pumping the gas generated by the battery, and then sealing the liquid injection port. With the method provided by embodiments of the present invention, a compact and stable SEI film can be effectively formed on the cathode surface; the sealed formation method is adopted during the formation process, such that the influence on the battery performance due to the reaction generated between the moisture and the electrolyte is avoided, wherein the reaction is generated due to water absorbing inside the battery; after the voltage of the battery is the cut-off voltage during the constant voltage charging, the gas generated from the battery is removed through vacuum pumping, then the liquid injecting port is sealed, such that the environment inside the battery shell is effectively improved, the battery bulging during the using process is avoided, the performance degradation of the battery is delayed, the electrical property and the safety performance of the battery are improved.

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Cited By (5)

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    CN-103390770-ANovember 13, 2013天津力神电池股份有限公司Lithium ion battery formation sectional charging method
    CN-103560280-AFebruary 05, 2014深圳华粤宝电池有限公司Chemical synthetic method of lithium ion battery
    CN-103560280-BJuly 06, 2016深圳华粤宝电池有限公司锂离子电池的化成方法
    CN-104157920-ANovember 19, 2014合肥国轩高科动力能源股份公司High-energy density lithium ion battery formation method
    CN-104157920-BAugust 17, 2016合肥国轩高科动力能源有限公司一种用于高能量密度锂离子电池的化成方法