Provided is a clock management apparatus wherein the clock management apparatus includes a clock synchronization signal generator, a plurality of clock gating units and clock frequency division modules; a synchronization signal of a predetermined period is generated by the clock synchronization signal generator; each of the clock gating units is connected in series with a corresponding one of the clock frequency division modules to form a signal processing branch; and the signal processing branches are connected in parallel to receive a source clock signal respectively, the clock gating unit controls the on-off switch of the signal processing branch, and the clock frequency division modules are configured to perform phase adjustment on the clock signals of the signal processing branches after receiving the synchronization signal output by the clock synchronization signal generator, and to adjust the clock signals of the signal processing branches from an asynchronous state to a synchronous state.

A battery monitoring system that monitors states of a plurality of batteries. The battery monitoring system includes a battery monitoring ECU and a plurality of battery monitoring devices. The battery monitoring ECU and the plurality of battery monitoring devices are connected to each other in any connection form of ring connection, daisy chain connection, or multi-drop connection.