Battery module and charger

The utility model relates to a battery module and a charger. The battery module comprises a battery pack formed by connecting a plurality of cells in series, a passive equalization module, a switch array and drive circuit, a battery state parameter detection module and a charging and discharging 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; the storage battery can be replaced with a traditional lead-acid storage battery in a one-to-one mode, and the storage battery is sui