Power battery module and battery box

The invention discloses a power battery module and a battery box and solves the problems that the low-temperature performance of a power battery cannot meet requirements in the prior art. The power battery module is simple and convenient to assemble and reliable and effective in safety protection, the problem of use of the power battery at the low temperature can be notably solved, and large-scale popularization and application are facilitated. According to the technical scheme, the power battery module comprises a battery combined module which is formed by at least one battery cell in parallel; the battery combined module is arranged in a cavity defined by two fixing plates, two heating clamp plates and a lower bottom plate, insulating plates are arranged between the fixing plates and the battery combined module and between the lower bottom plate and the battery combined module, and a heat conduction component is arranged between the heating clamp plates and the battery combined module; an isolation assembly