Battery backup unit

The utility model discloses a battery backup unit. The battery backup unit is electrically connected to a load system and comprises a battery pack, a circuit board assembly and a metal bus board. The circuit board assembly is provided with a battery backup unit application circuit, and the battery backup unit application circuit is electrically connected with the battery pack; the metal bus board is located at a large current path on the circuit board assembly and is electrically connected with a load system so as to bear large current between the battery pack and the load system. Therefore, leads for bearing large current arranged on the circuit board assembly can be reduced, the space utilization rate of the circuit board assembly is increased, and a multi-layer board is not needed, so that the manufacturing cost is saved. 本实用新型公开了一种电池备份单元。所述电池备份单元电性连接至负载系统，并包括电池组、电路板组件和金属总线板。电路板组件设置有电池备份单元应用电路，电池备份单元应用电路电性连接电池组；金属总线板位于电路板组件上的大电流路径处，并电性连接负载系统，以承载于所述电池组和所述负载系统之间的大电流。因此，可减少在电路板组件上安排承载大电流的导线，增加电路板组件的空间利用率，且不需使