BATTERY PACK, CHARGER AND ELECTRIC TOOL

摘要

A battery pack is provided which includes a battery housing, a battery cell assembly, and more than two connection terminals. The battery housing has an insert housing wall. The insert housing wall has an insertion structure having an insertion direction which forms an angle greater than or equal to 0 degree and less than or equal to 45 degrees with respect to a maximum projection surface or a maximum size direction of the battery cell assembly. The battery pack can output voltage exceeds 30V and has a safe and reasonable structure.