Battery module system and linear charging and discharging current limiting module

The invention discloses a battery module system and a linear charge and discharge current limiting module, the system comprises a plurality of battery modules and a current limiting module, the plurality of battery modules are connected in parallel, and the current limiting module is connected to a current loop to provide automatic current limiting when voltage difference exists between the battery modules connected in parallel. The parallel modules are subjected to automatic current sharing in a controlled current range; and when the voltages of the parallel battery modules are consistent, the current limiting module is cut off. The battery module system is provided with the current limiting module, when the parallel battery modules are inconsistent in voltage and charging exists between the battery modules, the current limiting module provides an automatic current limiting function, the situation that the battery module system is protected due to large current impact at the moment of parallel connection of