A method for balancing control of lithium battery packs for hybrid power

A technology of balanced control and lithium battery packs, applied in battery/fuel cell control devices, control devices, electric vehicles, etc., can solve the problem of inability to judge battery consistency, consistency adjustment, and lack of consistency judgment standards for hybrid lithium battery packs And effective adjustment methods and other issues, to achieve the effect of stable battery consistency, small amount of calculation, and avoiding errors

Active Publication Date: 2021-07-23
NO 719 RES INST CHINA SHIPBUILDING IND
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  • Summary
  • Abstract
  • Description
  • Claims
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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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  • A method for balancing control of lithium battery packs for hybrid power
  • A method for balancing control of lithium battery packs 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 a balancing control method for a lithium battery pack for hybrid power. The target state of the balance control is that all single cells reach the middle value Sm of the remaining capacity (SOC) at the same time when charging and discharging. The middle value SOC Sm can be set according to application requirements, generally around 50%. The balance control The algorithm does not need to obtain the maximum available capacity value of each single battery, but only uses the voltage and current characteristics of a certain interval during the charging and discharging process of the single battery to analyze the deviation between the SOC of the battery pack and Sm when the SOC of the battery pack reaches Sm, and thus As a criterion, make the battery pack reach the balanced target state. The balance criterion is easy to obtain and has strong applicability. Using this control method for the battery pack can make the battery pack reach an ideal balanced target state. In this target state, the loss of available capacity of the battery pack is effectively reduced, and the state is guaranteed to be stable for a long time.

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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Patent Type & Authority Patents(China)
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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