Charge-discharge automatically equalized lithium-ion power battery series battery pack

Abstract

The invention relates to a lithium-ion power battery, especially to a charge-discharge automatically equalized lithium-ion power battery series battery pack, which consists of several single lithium-ion power batteries (1) connected in series, and additionally single lithium-ion equilibrium batteries (2) and a chip (9). The positive electrode of each single lithium-ion power battery (1) is in connection with the positive electrode of a single lithium-ion equilibrium battery (2). A charge control circuit (3) and a discharge control circuit (4) are disposed between each single lithium-ion power battery (1) and single lithium-ion equilibrium battery (2). And each single lithium-ion power battery (1) is provided with an overcharge and overdischarge protection circuit (5). The invention also provides another scheme that the negative electrode of each single lithium-ion power battery (1) is in connection with the negative electrode of each single lithium-ion equilibrium battery (2). According to the invention, the battery back can operate in an ideal state all the time, and has the advantages of simple structure, long service life, high charge-discharge efficiency, and low cost.

Description

technical field [0001] The invention relates to a lithium-ion power battery, in particular to a lithium-ion power battery series battery pack with automatic charging and discharging balance, and belongs to the field of power batteries. Background technique [0002] At present, lithium-ion power batteries are widely used, and they can be used in many fields such as various electric tools, electric bicycles, electric motorcycles, and electric vehicles. Lithium-ion power batteries are used as the power source for power supply. In practical applications, several single lithium-ion power batteries are usually connected in series to form lithium-ion power battery series battery packs and then used in groups to meet the voltage and power requirements of different equipment. Requirements; at the same time, based on the charging and discharging characteristics of lithium-ion power batteries and the actual situation of differences between individual batteries in actual use, it is nece...

AI Technical Summary

Problems solved by technology

[0008] The balance control conventionally adopted above cannot solve the problem of the consistency of the capacity of each single battery in the lithium-ion power battery series battery pack, but only solves the problem of the consistency of the state of charge of each single battery, and the solution is not ideal. There are many defects mentioned above

Therefore, it is impossible to achieve the ideal state of consistency between the individual cells in the lithium-ion power battery series battery pack.

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