摘要
电池产气导致内压增大,可能引起电池结构开裂,导致漏液、起火等安全可靠性问题。通过设计合理体积的电池残空间,可以确保电池在具有高能量密度的情况下,同时降低电池内压,降低失效风险。本文基于质量守恒定律及理想气体方程,开发了一套操作简易、准确度高的残空间测试技术。经过验证,该技术的测试精度与所选气压表的精度密切相关,采用高精度气压表时,测试偏差仅0.04%左右。采用这种技术,本文准确测量了不同SOC状态下的电池残空间变化,测试结果与理论推导相符。该方法同样适用于研究不同气体在电解液中的溶解,为计算电池真实产气量提供了基础数据。
The increase of internal pressure caused by gas generation may cause structural cracking of the battery,leading to safety and reliability issues such as electrolyte leakage and thermal runaway.A reasonable residual volume of battery is very important,because it can ensure that the battery has a high energy density,while reducing the internal pressure of the battery,thereby reducing the risk of battery failure.We developed a simple and accurate method to measure the residual volume of battery based on the law of conservation of mass and the ideal gas equation.It has been verified that the test precision of this method is mainly determined by the accuracy of the selected barometer.By using a high-precision barometer,the test deviation is only about 0.04%.We measured the evolution of residual volume under different SOC states,and the results are consistent with the theoretical deduction.This method is also suitable for studying the dissolution process of different gases in electrolytes,providing basic data for calculating the practical gas volume ofbatteries.
出处
《时代汽车》
2023年第24期115-118,共4页
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关键词
电池产气
残空间
测试精度
气体溶解
Gas generation
residual volume
test precision
gas dissolution
