Energy storage battery pack equalization system
A technology for balancing systems and battery packs, applied in charge balancing circuits, battery circuit devices, arrangement of multiple synchronous batteries, etc., can solve the problems of low cost, fast and efficient balancing of the whole battery pack, battery energy waste, and application range Narrowness and other problems, to achieve the effects of significant equalization effect, fast equalization speed, and less energy loss
Inactive Publication Date: 2019-07-12
杭州科工电子科技股份有限公司
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[0003] It is considered to be a feasible solution to improve the performance of the battery pack by adding an additional battery balancing system, among which there are many passive balancing solutions that use resistors to dissipate heat, but this solution is only applicable to the charging process, resistor heating and battery energy waste. The range is narrow; the flying capacitor or energy storage inductance scheme with less energy loss is not suitable for large-capacity battery energy storage due to the shortcomings of low power and slow equalization speed; through DC / DC converters, DC / AC converters or two A combination of the two is more suitable for large-capacity battery energy storage
[0004] At present, the research based on the DC / DC converter and DC / AC converter scheme is mostly focused on the realization of local cell balance in the battery pack and how to improve the conversion efficiency of the converter, and rarely considers how to achieve low-cost, The problem of fast and efficient equalization, and this problem is a difficult problem that must be solved for large-capacity battery energy storage
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[0023] Balanced system structure see attached figure 1 , mainly including battery pack 1, battery management module (BMU) 2, intra-group converter 3, inter-group converter 4, switch group 5 and power supply bus 6. The battery pack 1 is composed of 24 cells of lithium iron phosphate cells connected in series, and the battery management module 2 supports voltage collection of 12 cells, so the battery pack 1 is divided into two groups; Its low-voltage side forms a low-voltage circuit with the switch group and the single battery, and the high-voltage side is directly connected to the terminal of the battery group to form a high-voltage circuit; the inter-group converter 4 is used for battery balancing between the groups, and one side is directly connected to the terminal of the battery group. The connection forms a loop, and the other side is connected to the battery management module power supply bus 6 to form a loop; the switch group 5 is used to select the connection loop betw...
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The invention relates to an energy storage battery pack equalization system which comprises a battery pack. The whole battery pack is divided into a plurality of groups and is equipped with a batterymanagement unit (BMU), an in-group converter, an inter-group converter and a switch group to accelerate equalization speed and prevent the excessive system complexity. An equalization scheme proposed by the invention can realize the internal power balance of a local battery group in the whole battery pack and realize the inter-group equalization of different local battery groups, the energy lossis small, the equalization speed is fast, the efficiency is high, the structure is simple, the cost is low, and the equalization scheme is suitable for a large-capacity battery energy storage system.
Description
technical field [0001] The invention relates to the field of batteries, in particular to an energy storage battery equalization system. Background technique [0002] After the batteries are grouped, the performance of the single cells is inconsistent due to the difference in the manufacturing process level and the rate of decline. Compared with the performance of the single cells, the performance will be reduced to less than 80%. At present, it can only be solved by replacing the worst single cells, which will undoubtedly increase the number of battery manufacturers. And the cost of users has become an urgent problem that plagues the application of battery energy storage. [0003] It is considered to be a feasible solution to improve the performance of the battery pack by adding an additional battery balancing system, among which there are many passive balancing solutions that use resistors to dissipate heat, but this solution is only applicable to the charging process, resi...
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IPC IPC(8): H02J7/00
CPCH02J7/0016
Inventor 宋欣民刘爱华王荣强刘平根严辉强
Owner 杭州科工电子科技股份有限公司
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