The overcurrent protection is 2 to 3 times of the continuous current, and it will be protected only when the overcurrent value is reached within 200ms. If the continuous current of the protection board is exceeded and the overcurrent value is not reached, the protection board cannot bear it, and the heat will be severe, which may burn out. Overcurrent protection is to protect the abnormal large current in the battery circuit, such as: the controller does not start the current limit, the motor is blocked, short circuit, etc., are all abnormal large currents, and have no current limiting effect