Safe BMS (Battery Management System) for rapidly protecting abnormity of battery energy storage system

Abstract

The invention belongs to the technical field of energy storage battery management systems, and particularly relates to a safe BMS (Battery Management System) for rapidly protecting the abnormality of a battery energy storage system. The invention aims at the prior art and scheme, a relay on each battery operation parameter monitoring and sampling module is omitted, an electric control switch on-off driving electric signal and a terminal of each battery operation parameter monitoring and sampling module are directly connected with an electric control switch, connected with a direct-current bus, of a battery cluster respectively, that is, when it is monitored that a battery is abnormal, the battery operation parameter monitoring and sampling modules directly and electrically drive and disconnect the electric control switch, connected with the direct-current bus, of the battery cluster, and accidents are prevented. Therefore, the system structure and composition are simplified, the cost is saved, the beneficial effect of getting twofold results with half the effort is achieved, and meanwhile the response speed and reliability of the BMS to battery protection are improved.

Description

technical field [0001] The invention belongs to the technical field of energy storage battery management systems, and in particular relates to a safety BMS system for abnormally fast protection of battery energy storage systems. Background technique [0002] The publication number is CN210577773U, and the subject name is a utility model patent based on BMS safety chain protection device. The output terminals of the units are respectively provided with output relays; the DC control unit includes a main contactor KM, and the output relays of the output terminals of each battery measurement unit are connected in series and are electrically connected to the input interface of the DC control unit of the combiner cabinet at the same time, The output interface of the DC control unit is docked with the battery pack of the combiner cabinet." The public plan also records that "the BSU is allowed to work after receiving an instruction from the superior EMS (Energy Management System, en...

AI Technical Summary

Problems solved by technology

[0004] 1) Unable to start safely: each BTU cannot conduct the control power before the relay K0 contact is closed, the DCU cannot work and obtain battery parameters, and the BSU cannot judge whether the battery is faulty; if an additional power supply system is added, it will increase the cost and cause waste

[0005] 2) Response delay: even if it starts to run, due to the two-level drive power-off method, that is, when the battery measurement unit finds that the battery is abnormal, it first drives and disconnects the relay on its own BTU (the corresponding one of K1~K13), so that the DCU shuts down. When the string battery is not normal, disconnect the KM again, and it will take one more time to drive and disconnect the action, resulting in a delay in response

[0006] 3) High cost and poor reliability: Since each battery measurement unit BTU is used to install a relay and the output relays of the output terminals of each battery measurement unit are connected in series, many relays not only increase the cost but also reduce the reliability of the system

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