锂离子电池在充放电过程中的产热研究

Study on heat production of lithium ion batteries during charge and discharge process

为保证电池在使用过程中性能的正常发挥和安全使用,以不同材料组成的商业化圆柱型锂离子电池为研究对象,采用绝热加速量热仪和充放电仪在线研究了锂离子电池充放电过程中的产热行为。结果表明:LiFePO4体系电池在放电过程的放热量最低,因此在车载电池使用中具有绝对优势;Li(Ni0.5Co0.2Mn0.3)O2体系电池产热量略高于LiFePO4体系,从数值分析,尚可应用于车载电池领域,而LiCoO2体系电池由于产热量巨大,而不适宜于在车载电池中的应用。通过对半电池的放热研究发现,LiCoO2体系电池放电过程的产热决定因素为正极;而LiFePO4和Li(Ni0.5Co0.2Mn0.3)O2体系放电过程主要产热因素为负极。

In order to ensure the good performance and safety of the battery in normal use, the heat production behavior during its charge and discharge process was studied by on-line testing with the accelerating rate calorimeter and charge and discharge device. The commercialized cylindrical lithium ion batteries with different components were studied. The test results show that： UFePO4 cell gives out the minimum heat production in discharge process, which confirms that the LiFePO4 cell has the absolute advantage over Li （Ni0.5Co0.2Mn0.3）O2 and LiCoO2 cells as vehicle battery. While the LiCoO2 battery gave out a huge heat production, and this indicates that it is not suitable for the vehicle application. The heat production research on half cells indicates that the dominant heat production factor during discharge is positive in LiCoO2 battery; while the dominant factor for LiFePO4 and Li- （NiosCo0.5Mn0.3） O2 batteries dudng discharge process is negative.