Energy storage system direct-current unit with reliable overcurrent protection, and energy storage system

Abstract

The present application relates to the technical field of overvoltage protection. Provided are an energy storage system direct-current unit with reliable overcurrent protection, and an energy storage system. The energy storage system direct-current unit comprises: a battery cluster, at least one fuse and an overvoltage protection apparatus, wherein the at least one fuse is connected in series in a direct-current circuit formed by the battery cluster; and the overvoltage protection apparatus is connected in parallel to the direct-current circuit, and is configured to suppress an overvoltage generated at the instant when the at least one fuse blows. In view of the problem that it may be difficult to interrupt a faulty overcurrent circuit due to an overvoltage at the instant when the fuse blows, the present application provides an overvoltage protection apparatus in an energy storage system direct-current unit. The overvoltage protection apparatus is connected in parallel to a direct-current circuit, and is configured to suppress an overvoltage generated at the instant when the fuse blows, thereby effectively reducing or even eliminating the risk of arc reignition leading to fusing failure after the fuse blows, and achieving reliable overcurrent protection of the direct-current unit.

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