采用电化学-量热法对LiFePO4锂离子电池在不同倍率下的循环产热进行了系统的研究,并基于热传导理论建立了锂离子电池热模型,采用有限元ANSYS模拟了稳态温度场.结果表明,电池充放电循环过程的总热效应表现为放热现象,发热量和热生成率均与充放电倍率成线性关系,随着倍率的增大而增大.充放电倍率和工作温度对电池内部温度分布有一定的影响.在相同倍率条件下,工作温度越高,电池内部温度场分布均匀性越差.在相同工作温度下,充放电倍率越大,电池内部温度场分布的均匀性越差.
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