Dual-voltage hybrid equalization control method of series battery pack

A series battery pack and equalization control technology, which is applied in battery circuit devices, secondary battery charging/discharging, secondary battery repair/maintenance, etc., can solve the problems of poor expansion of transformer-type equalizing circuits, transformer magnetic flux leakage, complex structure, etc.

A series battery pack and equalization control technology, which is applied in battery circuit devices, secondary battery charging/discharging, secondary battery repair/maintenance, etc., can solve the problems of poor expansion of transformer-type equalizing circuits, transformer magnetic flux leakage, complex structure, etc.

CN109768595AInactive Publication Date: 2019-05-17HENAN POLYTECHNIC UNIV
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  • Dual-voltage hybrid equalization control method of series battery pack
  • Dual-voltage hybrid equalization control method of series battery pack
  • Dual-voltage hybrid equalization control method of series battery pack

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Experimental program
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Embodiment Construction

[0036] Such as figure 1 As shown, a flow chart of a dual-voltage hybrid equalization control method for a battery pack in series, dual voltage refers to the highest single cell voltage and the lowest single cell voltage in the battery pack, hybrid equalization refers to the balance control of the charging process and the discharge The balance control of the process is combined into one. During the charging / discharging equalization process, not only the single battery with high terminal voltage is discharged and balanced, but also the single battery with low terminal voltage is charged and balanced. This control method is reliable and online The calculation amount is small, which can significantly improve the battery pack equalization speed, improve the battery energy utilization rate, and prolong the battery life.

[0037] The dual-voltage direct equalization control method includes the following steps:

[0038] (1) Set the balance index

[0039] Taking the largest single ce...

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Abstract

The invention discloses a dual-voltage hybrid equalization control method of a series battery pack. Dual voltages mean maximum single battery end voltage and minimum single battery end voltage in allsingle batteries of a series battery pack, hybrid equalization is in a way that discharging equalization is performed on the single battery corresponding to the highest end voltage and charging equalization is also performed on the single battery corresponding to the lowest end voltage during the charging equalization process, the charging equalization is performed on the single battery corresponding to the lowest end voltage and the discharging equalization is also performed on the single battery corresponding to the highest end voltage during the discharging equalization process until the voltage of each single battery in the battery pack conforms to consistency index, namely equalization stopping. By the control method, the equalization speed of the end voltage of the battery pack can be remarkably improved on the basis of existing hardware. The control method is suitable for a battery pack equalization management system.

Description

technical field [0001] The invention relates to a balance control method for series battery packs, which is suitable for battery management systems in new energy vehicles or micro-grid energy storage systems. Background technique [0002] Due to the inconsistency of the single cells in the battery pack, after the charging of the battery pack is completed, some of the single cells are not fully charged; after the discharge of the battery pack is completed, some of the single cells are not discharged. The sum of the capacity of each single battery is reduced, and the cycle life of the battery pack is also affected. The function of the equalization circuit is to reduce the impact of the inconsistency of the single cells on the overall battery pack, thereby improving the energy utilization rate of the battery pack. Extend battery life. [0003] As the most important function of the battery management system, battery equalization has been studied by many scholars at home and abr...

Claims

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Application Information

Patent Timeline
17 May 2019
Publication
CN109768595A
IPC
H02J7/00; H01M10/44
CPC
Y02E60/10
Inventors
郭向伟; 张伟