电动汽车动力电池低温自放电加热电路研究

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中图分类号：U469.72 文献标志码：A DOI： 10.20104/j.cnki.1674-6546.20250181

【Abstract】Thelithium-ion batery experiences a decrease in power densityand energy density due toan increase in electrolyteviscosityinlow-temperatureenvironments，whichseriouslyafectstherangeandcharginganddischargingsafetyof electricvehicles.Therefore，preheating thebateryunderlowtemperatureconditionisthekeytoensuringthepower performanceof electric vehicles.This paperisbasedon thelow temperature self-discharge heating circuitof electric vehicle powerbatery，andstudies itsmodeling methodandcontrolstrategy.Bycharging thebatterytoacapacitortosimulateashort circuitstateofthebatteryapulsecurrentisreleased toquicklyincreasethebatery temperature.Theauxiliary heating elementis heated byacomplementary conducting power switch tube to improve thebaterychargingand discharging performance，andachievereliableheatingof thepower bateryinlow-temperatureenvironments.Finaly，thesimulation model andtestplatformare builttoverifytheproposed method，andtheresultsshowthatthesuface temperatureof the battery rises to 20YC within 3 min under the environment temperature of -40°C ，which proves the high efficiency and safety of the method.

Key words： Electric vehicle，Power battery，Low temperature heating，Self-Discharging

1前言

锂离子电池在低温环境下性能显著下降，主要表现为电解液黏度增大、内阻上升，导致功率密度和能量密度降低，进而影响电动汽车的续驶里程和充放电安全性1-2]。（剩余5787字）