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A control method for an electric vehicle supplementary lithium battery pack equalization device

A technology for equalizing devices and lithium battery packs, which is applied in the direction of electric vehicles, battery circuit devices, battery/fuel cell control devices, etc., can solve problems such as large equalization errors, performance degradation of lithium battery packs, and inconspicuous equalization effects, and achieve improved Accuracy, good equilibrium stability, and the effect of specifying a clear relationship between incentives and characteristics

Active Publication Date: 2021-01-26
NO 719 RES INST CHINA SHIPBUILDING IND
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AI Technical Summary

Problems solved by technology

[0002] Due to material characteristics, manufacturing process, working conditions, and aging and decline, after lithium batteries are grouped, with the increase in the number of uses, the capacity, remaining power, and internal resistance of the single battery have differences and gradually expand, resulting in lithium batteries. Battery Pack Deterioration
A variety of equalization methods have been proposed in the industry, but usually only the current state of the battery is used to judge the equalization, which is likely to cause large equalization errors and the equalization effect is not obvious

Method used

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  • A control method for an electric vehicle supplementary lithium battery pack equalization device
  • A control method for an electric vehicle supplementary lithium battery pack equalization device

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Embodiment Construction

[0019] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0020] figure 1 It is a working principle diagram of the equalizing device for the supplementary electric lithium battery pack described in the method of the present invention.

[0021] The control method of the equalizing device of the supplementary electric lithium battery pack is based on the equalizing action performed by the supplementary electric equalizing device. The principle of the supplementary electric equalizing device is that the power input of the equalizing device is the existing DC / DC device and 12 / 24V battery, through the internal power electronic circuit and switching device, select one or more batteries in the power battery pack to charge it, and control the charging current and power. The equalization device has the function of measuring the voltage of all single batteries, and has The communication function can obtain the...

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Abstract

A control method for an electric vehicle supplementary lithium battery pack equalization device, comprising the following steps: when the power battery pack is charging, the ECU records the charging current of the battery pack and the terminal voltages of all single cells within a period of time; when the power battery pack When any one of the single cells is fully charged, the charging stops, and the ECU records the change data of the terminal voltage of all the single cells within a period of time after the charging current is 0; The distance to fully charge the required power data; the ECU reads the stored supplementary power data of all single cells in the power battery pack, and starts the supplementary lithium battery pack balancing device to adjust the power of the single cells that are seriously behind. Carry out supplementary electricity; measure and judge each time the battery pack is charged, perform equalization when discharging, and execute the above steps cyclically. The invention is suitable for the synchronous control of the charging cut-off point of the battery pack, and is efficient and fast, and the system responds quickly.

Description

technical field [0001] The present invention relates to a control method for an equalizing device of a supplementary electric lithium battery pack for an electric vehicle, in particular to using a special supplementary electric equalization circuit to control the consistency of the lithium battery pack of an electric vehicle, and to reduce the loss of the battery pack due to differences in the cells. resulting in capacity loss. Background technique [0002] Due to material characteristics, manufacturing process, working conditions, and aging and decline, after lithium batteries are grouped, with the increase in the number of uses, the capacity, remaining power, and internal resistance of the single battery have differences and gradually expand, resulting in lithium batteries. The performance of the battery pack has deteriorated. A variety of equalization methods have been proposed in the industry, but usually only the current state of the battery is used to judge the equali...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60L58/22H02J7/00
CPCH02J7/0014Y02T10/70
Inventor 邓磊孔祥伟李小谦吴浩伟魏华蔡凯姜波李锐李可维李鹏蔡久青汪文涛吴钫金翔方芸徐正喜陈涛罗伟耿攀
Owner NO 719 RES INST CHINA SHIPBUILDING IND
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