A method for charging a lithium iron phosphate standby battery pack for suppressing circulating current generation

Abstract

The invention discloses a charging method of a lithium iron phosphate standby battery pack for suppressing circulating current generation, which solves the problem that circulating current is easy tobe generated when a plurality of single battery cells are connected in series in parallel and are intermittently charged on a DC bus bar. The invention adopts the intermittent charging mode to avoid accidental damage to the accumulator caused by long-term floating charge and long service life of the accumulator. When the battery is intermittently charged, the method of wheel charging is adopted toavoid circulating current between two parallel branches. Multiple batteries are paralleled and redundant, which are standby for each other and have high reliability. The whole battery is composed ofsingle-cell battery in series, which eliminates the over-current problem caused by the unbalance between the cells of the single-cell battery. It is convenient to expand the capacity of multiple batteries in parallel, and the reconstruction work is small. A large group of a plurality of group of parallel lithium iron phosphate batteries adopt a single group of alternate charging and a plurality ofgroups of simultaneous discharging operation mode, thereby avoid that phenomenon of circulating current caused by the simultaneous charging of two or more groups of batteries.

Description

technical field [0001] The invention relates to a charging method for a backup battery pack of a DC power supply system of a substation (power plant), in particular to a charging method for a backup power supply of a lithium iron phosphate battery pack of a DC power supply system of a substation (power plant). Background technique [0002] The protection equipment, communication equipment, circuit breaker opening and closing operation, and emergency lighting equipment of the substation (power plant) are all provided with uninterrupted power by the DC power system. An important facility for safe and stable operation; the stability of power system operation and the reliability of relay protection depend to a large extent on the stability and reliability of the DC power system. Most of the existing DC power supply systems in substations use lead-acid battery packs, but lead-acid batteries have high requirements on the operating environment, poor safety performance, short servic...

AI Technical Summary

Problems solved by technology

[0004] The invention provides a charging method for a lithium iron phosphate backup battery pack that suppresses the generation of circulating currents, and solves the technical problem that circulating currents are likely to occur when several single battery cells are connected in parallel and then connected to a DC bus for intermittent charging.

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