电动车低温环境下电池加热系统研究

Researh on battery heating system of Electric Vehicle in low temperatures

低温条件下,由于锂离子电池本身的物理特性,其电解液粘度将增加,从而使得锂离子电池外在表现为功率密度及能量密度的下降。本文针对锂离子电池在低温条件下充放电性能下降的问题,提出一种自放电限流电路加热电池包的方法,使得电池在低温条件下可以在短时间内自发加热达到电池正常工作的温度,从而达到降低电池损耗,延长电池寿命,减少安全事故发生概率的目的。

At low temperature,the electrolyte viscosity of lithium-ion batteries will increase due to the physical characteristics of lithium-ion batteries,resulting in the decrease of power density and energy density of lithium-ion batteries.Aiming at the problem that the charging and discharging performance of lithium-ion batteries decreases at low temperature,a method of heating battery pack by self-discharging current limiting circuit is proposed,which enables the batteries to spontaneously heat in a short time to achieve the normal working temperature of the batteries under low temperature conditions,so as to achieve the purpose of reducing battery loss,prolonging battery life and reducing the probability of safety accidents.