A high-voltage battery cluster and its overcurrent protection circuit and switch box

Abstract

The application provides a high-voltage battery cluster and its overcurrent protection circuit and switch box. The overcurrent protection circuit includes a first fuse module and a second fuse module; since the withstand current-time curves of the two fuse modules are different, when When an over-current fault occurs in the high-voltage battery cluster, one of the fuse modules will disconnect the high-voltage battery cluster before the other fuse module, so as to ensure that the high-voltage battery cluster will not be damaged by a large current impact when an over-current fault occurs; Compared with the existing technology, when an overcurrent fault occurs in the high-voltage battery cluster, only one fuse module disconnects the connection between the high-voltage battery cluster and the circuit loop in the present application. Causes the problem of superposition of the current change rate, and then makes the current change rate in the circuit loop during the disconnection process lower than the situation in the prior art where two fuses are blown at the same time, thereby reducing the current generated in the current loop Shock and voltage shock.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a high-voltage battery cluster, an overcurrent protection circuit and a switch box. Background technique [0002] At present, electrochemical energy storage has also been developed on a large scale in the power system. At present, the capacity of typical applications gradually reaches the MWh level of a single container, the port voltage of a single battery pack reaches 1000V, or even 1500V, and the charging and discharging current of a single battery pack reaches hundreds of amperes. Therefore, in a high-voltage, high-current working environment, when an overcurrent fault such as short circuit or overload occurs in the circuit loop, it will cause more serious circuit safety accidents. [0003] In order to avoid serious circuit safety accidents when an overcurrent fault occurs in the circuit circuit, the current technology usually connects a fuse in series with the pos...

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Problems solved by technology

[0004] However, with the above method, when an overcurrent fault occurs in the circuit loop, both fuses will be blown, and the resulting arc will cause a large change in the current change rate.

Moreover, under the action of the parasitic inductance of the circuit loop, the voltage change rate is relatively large, which in turn will generate a large reverse voltage at both ends of the high-voltage battery cluster, and its peak value can reach 2-5 times the rated voltage of the high-voltage battery cluster. A direct threat to the electrical safety of the high-voltage battery cluster

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