A kind of fork truck backup power source storing unit

The invention discloses a kind of fork truck backup power source storing unit, fork truck is provided with main power source case, several main batterys are placed in main power source case, and positive and negative anodes are sequentially connected and can be separated from each other between each main battery；The storing unit includes the counter-balanced carriage being arranged on fork truck, and standby electricity source capsule is provided on counter-balanced carriage, and standby electricity source capsule memory is placed with several reserve batteries.When the wherein main battery in main power source case is out of power, the main battery can be removed out of main power source case, and take out a reserve battery out of standby electricity source capsule and be replaced, simultaneously, main battery out of power can be temporarily stored in standby electricity source capsule, be charged again to main battery after fork truck completes work.Reserve battery can not only play substitution to main battery, while the weight of the standby electricity source capsule is superimposed upon on counter-balanced carriage, so that fork truck operation is more stable.Alternatively, can reduce the balance weight of counter-balanced carriage, under the premise of meeting counterweight total weight with save the cost.