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Equalization control method of lithium battery pack for hybrid power

A balanced control, lithium battery pack technology, applied in battery/fuel cell control devices, control devices, electric vehicles, etc., can solve the lack of consistency judgment standards and effective adjustment methods for hybrid lithium battery packs, consistency adjustment, It is impossible to judge the battery consistency and other problems, so as to ensure the consistency of the battery, reduce the amount of calculation, and avoid errors.

Active Publication Date: 2019-03-26
NO 719 RES INST CHINA SHIPBUILDING IND
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  • Summary
  • Abstract
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Problems solved by technology

The consistency of the lithium battery pack for hybrid power cannot be adjusted based on the data of the cut-off point of charging and the cut-off point of discharge, and when the remaining capacity is around 50%, the change of the battery terminal voltage is weak, and the consistency of the battery cannot be judged by the terminal voltage. The battery pack lacks consistency judgment standards and effective adjustment methods

Method used

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  • Equalization control method of lithium battery pack for hybrid power
  • Equalization control method of lithium battery pack for hybrid power

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Embodiment Construction

[0048] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0049] figure 1 It is a schematic diagram of the unbalanced state and the balanced target state of the balanced control of the lithium battery pack described in the method of the present invention.

[0050] As shown in the figure, it is assumed that the lithium battery pack is composed of 6 single cells in series, and the 6 single cells are represented by 6 rectangles, and the length of the rectangle represents the capacity of the battery. The single batteries are connected in series, so the current is the same, and the change in power is the same, so the change in power of the battery pack is represented by a blue dotted line.

[0051] From the unbalanced state (left figure), it can be seen that there are certain differences in the capacity and SOC of the six single batteries. When the battery pack is charging, the remaining power of the batt...

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Abstract

The invention discloses an equalization control method of a lithium battery pack for hybrid power. The target state of the equalization control is that: all battery cells simultaneously reach the median Sm of the state of charge (SOC) during charging and discharging, the median Sm can be set accord to application requirements, usually around 50%, the equalization control algorithm does not need toobtain the maximum available capacity value of each single cell, and only utilizes the voltage and current characteristics of a certain section in the charging and discharging process of the single cell to analyze the deviation between the SOC and the Sm of the single cell when the SOC of the battery pack reaches the Sm, so as to take the deviation as a criterion to enable the battery pack to reach the equalization target state. The equalization criterion is easy to obtain, the applicability is high, the battery pack can reach an ideal equilibrium target state by using the control method, theavailable capacity loss of the battery pack can be effectively reduced under the target state, and the long-term stability of the state is guaranteed.

Description

technical field [0001] The present invention designs a kind of balanced control method of lithium battery packs for hybrid power, specifically relates to the control method of the consistency of multi-series lithium battery packs for hybrid power, this control method can make the battery pack reach a kind of stable equilibrium state, reduce as much as possible Lithium battery pack usable capacity loss. Background technique [0002] Due to material characteristics, manufacturing process, working conditions, and aging and decline, after lithium batteries are connected in series, with the increase in the number of uses, the capacity, remaining power and internal resistance of the single battery appear to be different and gradually expand, resulting in The performance of the lithium battery pack is declining. A variety of equalization methods have been proposed in the industry, but no corresponding equalization method has been implemented for the characteristics of the hybrid l...

Claims

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Application Information

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IPC IPC(8): B60L58/22B60L58/12
CPCB60L2240/547B60L2240/549Y02T10/70
Inventor 邓磊李小谦孔祥伟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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