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Novel battery pack equalization circuit topology and equalization strategy

A technology for equalizing circuits and battery packs, which is applied in charge equalizing circuits, battery circuit devices, secondary battery charging/discharging, etc., and can solve problems such as loss

Active Publication Date: 2020-05-26
STATE GRID LIAONING ELECTRIC POWER RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the equalization energy will also produce a certain loss during the transfer process, and this loss is closely related to the selected equalization circuit topology and control strategy

Method used

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  • Novel battery pack equalization circuit topology and equalization strategy
  • Novel battery pack equalization circuit topology and equalization strategy
  • Novel battery pack equalization circuit topology and equalization strategy

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Embodiment 1

[0089] The invention is a novel battery pack equalization circuit topology and equalization strategy, including: the equalization circuit topology and the equalization strategy. Among them, the equalization circuit uses an inductor as a carrier to realize energy transfer between two adjacent single cells. Among them, the balance strategy takes the remaining capacity of the single battery as the balance target, which can ensure that all the single batteries are fully charged or discharged at the same time to achieve balance. At the same time, the total amount of charges transferred during the equalization process is reduced, and the efficiency is improved.

[0090] The operating principle of the equalization circuit of the present invention is as follows:

[0091] The balanced circuit topology proposed by the present invention is as follows: Figure 1a and Figure 1b As shown, each equalization block consists of two MOSFETs and an inductor. It should be noted that due to the...

Embodiment 2

[0141] The present invention is a new topology and equalization strategy of a battery pack equalization circuit. In order to apply the equalization strategy proposed by the present invention to an actual equalization circuit, a corresponding equalization control algorithm is proposed. The algorithm can determine the battery pair for charge transfer based on the remaining capacity of the individual cells. Specifically, the equalization algorithm in the state of charge can be summarized as follows: Input: the remaining capacity matrix C of each single battery, and the equalization period T.

[0142] Output: Cell pair for charge transfer.

[0143] 1: while Var(C) / avg(C)>0.01do

[0144] 2: d = argmax j∈v C (j)

[0145] 3:

[0146] 4:

[0147] 5:

[0148] 6: s=d+1

[0149] 7: Transfer charge from battery cell s to battery cell d for one equalization cycle

[0150] 8: Update the remaining capacity matrix of each battery cell

[0151] 9: end while

[0152] In the abo...

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Abstract

The invention belongs to the technical field of power equipment, and particularly relates to a novel battery pack equalization circuit topology and equalization strategy. The novel battery pack equalization circuit topology and equalization strategy comprises an equalization circuit topology and an equalization strategy, wherein the equalization circuit takes an inductor as a carrier and is used for realizing the transfer of energy between two adjacent single batteries; the equalization strategy takes the residual capacity of the single batteries as an equalization target and is used for enabling all the single batteries to be fully charged or emptied at the same time to realize equalization. According to the equalization circuit, the inductor is used as a carrier, and the transfer of charge energy between two adjacent single batteries can be realized. According to the equalization strategy, the residual capacity of the single batteries is taken as an equalization target, so that the quantity of electric charges transferred among the single batteries in the equalization process can be reduced, it can be ensured that all the single batteries can be fully charged or emptied at the same time, and the equalization is realized; and the situations of overcharge and overdischarge are avoided, and the total charge transferred in the equalization process can be reduced, so that the lossin the equalization process is reduced, and the equalization efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of electric power equipment, and in particular relates to a novel battery group equalization circuit topology and equalization strategy. Background technique [0002] Due to inconsistencies in materials and manufacturing processes, the same batch of batteries will also show differences in capacity, aging characteristics, and performance characteristics. Therefore, the state of charge and capacity of each single battery in a series battery pack will be unbalanced The situation, and the degree of imbalance will increase with the increase of the number of charge and discharge cycles. In the process of charging and discharging, the imbalance between single cells will cause some single cells to be overcharged or over-discharged, which will reduce the battery capacity, shorten the service life, and even directly damage the battery, and even cause an explosion. [0003] Therefore, it is extremely important for the...

Claims

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Application Information

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IPC IPC(8): H02J7/00H01M10/44
CPCH02J7/0019H01M10/441Y02E60/10
Inventor 张武洋程俊黄纯军孔剑虹王英明宫向东楚天丰吴蒙韩月杨璐羽
Owner STATE GRID LIAONING ELECTRIC POWER RES INST
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