A protection circuit for a battery management system, the battery management system comprising: a main circuit; and the protection circuit, wherein the main circuit comprises a power supply module, a first switch module, a load module, and a second switch module, wherein the first switch module is a switching transistor, and the second switch module is a switching transistor; and the power supply module, the first switch module, the load module, and the second switch module are serial connected; and wherein the protection circuit comprises a first protection module, a second protection module, a first freewheeling module, and a second freewheeling module, wherein the first protection module is a first capacitor, the second protection module is a second capacitor, the first freewheeling module is a first diode, and the second freewheeling module is a second diode, and the first diode and the second diode are serial connected between the first switch module and the second switch module; wherein a first terminal of the first protection module is connected to a first terminal of a first switch module in the main circuit of a battery management system, a second terminal of the first protection module is connected to a first terminal of the second protection module, a second terminal of the second protection module is connected to a first terminal of a second switch module in the main circuit of the battery management system, a first terminal of the first freewheeling module is connected to a second terminal of the first switch module, a second terminal of the first freewheeling module is connected to a first terminal of the second freewheeling module, a second terminal of the second freewheeling module is connected to a second terminal of the second switch module, and a node between the second terminal of the first protection module and the first terminal of the second protection module is connected to a node between the second terminal of the first freewheeling module and the first terminal of the second freewheeling module; when the first switch module is turned off, the first protection module, the first freewheeling module, the second freewheeling module, and other modules than the second switch module in the main circuit form a path to stabilize a voltage between the first terminal of the first switch module and the second terminal of the first switch module, and the voltage between the second terminal of the first switch module and the first terminal of the second switch module; and when the second switch module is turned off, the second protection module, the first freewheeling module, the second freewheeling module, and other modules than the first switch module in the main circuit form a path to stabilize a voltage between the first terminal of the second switch module and the second terminal of the second switch module, and the voltage between the second terminal of the first switch module and the first terminal of the second switch module; wherein the protection circuit comprises a first protection module, a second protection module, a first freewheeling module, and a second freewheeling module, wherein the first protection module is a first capacitor, the second protection module is a second capacitor, the first freewheeling module is a first diode, and the second freewheeling module is a second diode, and the first diode and the second diode are serial connected between the first switch module and the second switch module; wherein a first terminal of the first protection module is connected to a first terminal of a first switch module in the main circuit of a battery management system, a second terminal of the first protection module is connected to a first terminal of the second protection module, a second terminal of the second protection module is connected to a first terminal of a second switch module in the main circuit of the battery management system, a first terminal of the first freewheeling module is connected to a second terminal of the first switch module, a second terminal of the first freewheeling module is connected to a first terminal of the second freewheeling module, a second terminal of the second freewheeling module is connected to a second terminal of the second switch module, and a node between the second terminal of the first protection module and the first terminal of the second protection module is connected to a node between the second terminal of the first freewheeling module and the first terminal of the second freewheeling module; when the first switch module is turned off, the first protection module, the first freewheeling module, the second freewheeling module, and other modules than the second switch module in the main circuit form a path to stabilize a voltage between the first terminal of the first switch module and the second terminal of the first switch module, and the voltage between the second terminal of the first switch module and the first terminal of the second switch module; and when the second switch module is turned off, the second protection module, the first freewheeling module, the second freewheeling module, and other modules than the first switch module in the main circuit form a path to stabilize a voltage between the first terminal of the second switch module and the second terminal of the second switch module, and the voltage between the second terminal of the first switch module and the first terminal of the second switch module;