Dynamic parallel operation circuit and method for low-voltage household energy storage system

Abstract

A dynamic parallel operation circuit and method for a low-voltage household energy storage system are provided. The circuit comprises two battery pack current sampling modules and an inverter, the battery pack current sampling module comprises a battery module and a current sampling unit, one side of a positive electrode of the battery module is connected with the current sampling unit in series, the battery module comprises a battery, a discharging MOS and a charging MOS. The discharging MOS and the charging MOS are connected in series to a circuit, two battery pack current sampling modules are connected in parallel, the two ends of the parallel connection position of the battery pack current sampling modules are respectively provided with current nodes, the current nodes comprise a battery pack total positive node and a battery pack total negative node. The battery pack total positive node and the battery pack total negative node are connected with the inverter in series, the current sampling unit monitors the current condition in real time, and through cooperation of the discharging MOS and the charging MOS, parallel operation under the dynamic condition is completed, and meanwhile the problem of large-current circulation is solved.

Description

technical field [0001] The invention relates to the technical field of battery parallel protection, in particular to a dynamic parallel circuit and method for a low-voltage household energy storage system. Background technique [0002] At present, in order to facilitate the expansion of low-voltage household energy storage systems, multiple battery packs are often used in parallel, which may range from 2 to 5 sets. At present, the batteries are basically used in parallel under static conditions, and in static In the parallel operation, the voltage requirements for two or more sets of batteries are relatively high, and they must be controlled within a certain range. When the entire energy storage system cannot be paralleled with offline battery packs during energy storage charging or discharging, a set of battery packs will appear during use. It is already charging or discharging but another group of circuits still fails to participate, and it is difficult to achieve the para...

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Problems solved by technology

[0002] At present, in order to facilitate the expansion of low-voltage household energy storage systems, multiple battery packs are often used in parallel, which may range from 2 to 5 sets. At present, the batteries are basically used in parallel under static conditions, and in static In the parallel operation, the voltage requirements for two or more sets of batteries are relatively high, and they must be controlled within a certain range. When the entire energy storage system cannot be paralleled with offline battery packs during energy storage charging or discharging, a set of battery packs will appear during use. It is already charging or discharging but another group of circuits still fails to participate, it is difficult to achieve the parallel function under dynamic conditions, which will cause the system to fail to meet customer requirements, and there will be a problem of large current circulation

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