Equalization control method, device and system of battery

A battery equalization and control method technology, which is applied in the direction of battery circuit devices, circuit devices, charge equalization circuits, etc., can solve problems such as interruption of the equalization circuit, affecting the service life of the battery pack, and not being suitable for changing the system configuration, so as to achieve the effect of fast power consumption

Inactive Publication Date: 2018-03-06
SHENZHEN POLYTECHNIC
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Problems solved by technology

The nominal voltage of a single lithium-ion battery is 3.7V, so it is necessary to connect some battery cells in series to form a battery pack to obtain a high voltage output. It reduces the possibility of battery pack damage, fire or even explosion, seriously affecting the service life of the battery pack
[0003] At present, series active equalization circuits are widely used to correct inconsistencies in lithium-ion battery packs. However, series active equalization circuits usually have the following problems. First, the equalization speed is slow. For example, the equalization circuit consist

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  • Equalization control method, device and system of battery
  • Equalization control method, device and system of battery
  • Equalization control method, device and system of battery

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[0022] In order to make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be described clearly and completely in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of the embodiments of the present invention, not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work shall fall within the protection scope of the present invention.

[0023] The embodiment of the present invention provides a battery balancing control method, which is used to control the power of multiple battery cells connected in series in a battery module, such as figure 1 As shown, the method includes:

[0024] S10. Obtain the output voltage and current of each battery and each battery module, and estimate ...

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Abstract

The invention discloses an equalization control method, device and system of a battery. The control method comprises the steps of acquiring output voltages and output currents of each battery and eachbattery module, and estimating electric quantity of the battery and the battery module; processing difference between the output voltage of each battery module and a reference voltage by an error regulator to obtain a public reference current; adjusting the public reference current by feeding forward electric quantity of the battery to obtain a current reference value of each battery; and performing feedback regulation on the public reference current, and controlling a charging current of a corresponding battery. The reference current of each battery is changed according to the electric quantity of each battery, the reference current is adjusted by feedback, so that the size of the charging current is controlled, and the electric quantity of each battery is equalized.

Description

Technical field [0001] The present invention relates to the field of distributed power generation technology, in particular to a battery balance control method, device and system. Background technique [0002] In recent years, lithium-ion battery packs have been widely used in electric vehicles, medical equipment, new energy storage systems and other fields. The nominal voltage of a single lithium ion battery is 3.7V, so it is necessary to connect some battery cells in series to form a battery pack to obtain high voltage output. However, due to differences in the manufacture of lithium ion battery cells, aging attenuation, temperature gradient and other inconsistencies, the increase The battery pack is damaged, catches fire or even explodes, and seriously affects the service life of the battery pack. [0003] At present, series-type active equalization circuits are commonly used to correct inconsistencies in lithium-ion battery packs. However, series-type active equalization circu...

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Application Information

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IPC IPC(8): H02J7/00
CPCH02J7/0016
Inventor 高素萍李世泽
Owner SHENZHEN POLYTECHNIC
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