Multi-level active equalization circuit of energy storage battery system and control method thereof
An energy storage battery and active equalization technology, which is applied in the direction of charge equalization circuit, battery circuit device, secondary battery charging/discharging, etc., can solve the problems of long equalization time, lack of consideration of equalization, lack of overall control of energy storage battery system equalization, etc. , to achieve effective utilization, shorten the equalization time, and improve the overall capacity and power performance
An energy storage battery and active equalization technology, which is applied in the direction of charge equalization circuit, battery circuit device, secondary battery charging/discharging, etc., can solve the problems of long equalization time, lack of consideration of equalization, lack of overall control of energy storage battery system equalization, etc. , to achieve effective utilization, shorten the equalization time, and improve the overall capacity and power performance
CN110474386AActive Publication Date: 2019-11-19STATE GRID JIANGSU ECONOMIC RES INST +2
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[0022] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0023] The invention adopts a multi-level active equalization structure to divide the battery energy storage system into a plurality of modules. The internal balance of the modules is realized through active equalization, and a set of switch matrix and a module equalization main circuit are used between the modules to realize the balance among the modules.
[0024] Such as figure 1 As shown, the energy storage battery system is divided into a fixed number of n modules according to the number of monomers, and each module has m batteries connected in series. The active equalization circuit includes an intra-group equalization circuit and an inter-group equalization circuit. Including the battery state information acquisition circuit, switch array in the group, bidirectional DC-DC circuit in the group and slave MCU, the balance c...
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The invention discloses a multi-level active equalization circuit of an energy storage battery system and a control method thereof. A battery energy storage system is divided into a plurality of modules by adopting a multi-level active equalization structure; wherein the active equalization circuit comprises an intra-group equalization circuit and an inter-group equalization circuit, the intra-group equalization circuit comprises a battery state information acquisition circuit, an intra-group switch array, an intra-group bidirectional DC-DC circuit and a slave MCU, and the inter-group equalization circuit comprises an inter-group switch array, an inter-group bidirectional DC-DC circuit and a master MCU; intra-module equalization is achieved through active equalization in the modules, and equalization between the modules is achieved through adoption of the module equalization main circuit. Effective utilization of energy in the energy storage battery system can be achieved, the overallcapacity and the power performance of the battery pack can be effectively improved, and meanwhile, the equalization time is shortened.
Description
technical field [0001] The invention relates to an energy storage battery system equalization control technology, in particular to a multi-level active equalization circuit and a control method for an energy storage battery system. Background technique [0002] With the continuous development of battery energy storage technology, a large number of large-scale energy storage power stations have been put into the operation of the national grid, playing an important role in power generation, transmission, distribution and power consumption. Due to the difference in the manufacturing process and the use environment of the battery during the manufacturing process, the battery power will be unbalanced after long-term use. The inconsistent power of the battery cells in the battery pack will lead to a reduction in the overall capacity of the battery pack. The electricity released is lower than the superposition of monomers. At the same time, due to the constraints of individual cel...
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Patent Timeline
19 Nov 2019
Publication
CN110474386A
- IPC
- H02J7/00; H01M10/42; H01M10/44
- CPC
- H01M10/4207; H01M10/4257; H01M10/441; H01M2010/4271; H02J7/0014; Y02E60/10
- Inventors
- 孙建龙; 李妍