Pre-charge circuit and battery system

The invention discloses a pre-charging circuit and a battery system, which can realize current smoothing and energy storage through a pre-charging unit, and can perform energy release after energy storage, and can realize switching of a second loop and a first loop connected to the pre-charging unit through a loop switching unit. Therefore, the pre-charging of the load can be completed by using the characteristics of energy storage and energy release of the pre-charging unit. Meanwhile, the control of the driving circuit on the switching loop of the loop switching unit can be completed based on the pre-charging current of the pre-charging loop, so that the pre-charging current flowing through the pre-charging unit can be kept in a constant average current state in the continuous energy storage and release process of the pre-charging unit; therefore, the pre-charging of the load end can be more stable and quicker, and the overall thermal power consumption can be reduced at the same time. 本发明公开了一种预充电路及电池系统，通过预充