Battery management system and battery management method

The invention provides a battery management system and a battery management method, and belongs to the technical field of electric vehicles. By adopting the scheme, the independent memory is added, and the storage space of the independent memory can be far larger than the cache of the controller, so that the memory can store the fault information corresponding to multiple faults of the low-voltage battery in a period of time and the state information of the low-voltage battery in the period of time; the information can better assist maintenance personnel in determining all fault components more comprehensively. 本公开提供了一种电池管理系统和电池管理的方法，属于电动汽车技术领域。采用本方案，增加了独立的存储器，独立的存储器的存储空间可以远大于控制器自带的缓存，这样存储器可以将低压电池在一段时间内多次故障对应的故障信息和此段时间内低压电池的状态信息进行存储，在故障维修过程中，这些信息可以更好的辅助维修人员更全面的确定出各故障部件。