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

A backup battery and lithium iron phosphate technology, which is applied in secondary battery charging/discharging, battery circuit devices, secondary batteries, etc., can solve problems such as easy circulation, avoid accidental damage, have high reliability, and be easy to replace or The effect of expansion

Inactive Publication Date: 2019-01-08
ELECTRIC POWER RES INST STATE GRID SHANXI ELECTRIC POWER
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  • Abstract
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  • Claims
  • Application Information

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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 techni

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

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[0016] The present invention will be described in detail below in conjunction with the drawings:

[0017] A method for charging a lithium iron phosphate backup battery pack that suppresses circulating current. It includes a DC bus 1, an AC bus 2 and a DC power centralized management system 5. The AC bus 2 is connected to the DC bus 1 through a rectifier and charging device 6 A DC bus voltmeter 8 is connected to the bus 1, and the DC power centralized management system 5 is electrically connected to the rectifier and charging device 6 and the DC bus voltmeter 8 respectively; it is characterized by the following steps:

[0018] The first step is to connect several lithium iron phosphate single battery cells in series to form the first single battery cell series unit 3, connect the non-return diode in parallel with a charging switch to form the first intermittent control charging device 7, equipped with A single battery cell series unit management system 4; the first single battery ce...

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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...

Claims

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Application Information

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IPC IPC(8): H01M10/44H02J7/02
CPCH02J7/027H01M10/441Y02E60/10
Inventor 陶文彪王中杰杨爱晟张伟李国柱罗永勤张晓鹏李振宇王金浩马振国郝伟
Owner ELECTRIC POWER RES INST STATE GRID SHANXI ELECTRIC POWER
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