一种新型的锂电池发热量测试方法及发热特性分析

Anew calorific value measurement method and heating characteristic analysis of lithium battery

现有的发热量测试方法主要是绝热式量热方法,该方法由于热量无法散出导致电池温度过高,具有一定的安全隐患,同时大倍率放电情况下存在热量追踪不及时造成误差的情况。针对现有发热量测试存在的问题,提出了一种新型基于换热器的发热量测试方法,该方法可以将大倍率放电工况下的电池温度控制在安全范围内,同时实时监测电池的发热量,通过使用高精度测量设备实现锂电池发热测试研究,具有高精确度,良好的跟随性等特性。针对不同种类电池在不同放电电流条件下拟合出相关公式,为电池热管理分析提供可靠热特性参数,提供合理有效的散热方案。该理论及设计方法对于锂电池大倍率放电工况下的产热测试具有出色的效果。本实验研究有利于进一步分析不同放电工况下锂电池的热特性。

The existing calorific value test method is mainly adiabatic calorimetry,which has certain safety risks because the heat cannot escape leading to the high temperature of the battery.At the same time,there are errors caused by the heat tracking is not timely in the case of large rate discharge.In view of the existing problems in calorific value testing,a new calorific value testing method was proposed based on exchanger.The method could control the temperature of the battery in the high current discharge condition within the safe range,and at the same time monitor the calorific value of the battery in real time.The research on lithium battery heat generation testing by use of high-precision measurement equipment has the characteristics of high accuracy and good tracking.The relevant formulas for different types of batteries under different discharge current conditions were fitted,providing reliable thermal characteristic parameters for battery thermal management analysis and reasonable and effective heat dissipation scheme.The theory and design method have excellent effect on heat generation test of lithium battery under large rate discharge condition.The experimental study is conducive to further understanding the thermal characteristics of lithium batteries under different discharge conditions.