Battery module, system and control method

The invention relates to a modularized battery system and a control method, the modularized battery system comprises a battery module or a plurality of battery modules connected in series, and each battery module is provided with a battery pack formed by connecting a plurality of battery cells in series, a passive equalization module, a switch array and drive circuit, and a battery state parameter detection and charge-discharge control module. Wherein the battery state parameter detection module is used for measuring, processing and storing signals such as single battery voltage and module current; and the charge and discharge control module realizes battery equalization in the battery pack by using the passive equalization module, and realizes battery equalization between the battery modules by using the switch array. The battery system has low requirements on the consistency of the battery cells, the modules are completely independent, and any communication function and system general control are not needed