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Balance management system of battery pack for electric vehicle

A technology of balanced management and electric vehicles, applied in electric vehicles, battery circuit devices, current collectors, etc., can solve the problems of unbalanced battery packs in series and poor results, so as to reduce charging costs, solve unbalanced problems, and extend service life The effect of longevity

Inactive Publication Date: 2011-11-02
大连大工安道船舶技术股份有限公司
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  • Abstract
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  • Claims
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Problems solved by technology

[0003] Therefore, a variety of equalization schemes have been proposed for the unbalanced problem of the current series battery pack, but their effects are not good.

Method used

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  • Balance management system of battery pack for electric vehicle
  • Balance management system of battery pack for electric vehicle

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specific Embodiment approach

[0012] The electric vehicle battery pack balance management system includes three parts: a battery pack, a switch network and a capacitor pack, and is characterized in that: the capacitor pack is connected to the battery pack through a switch network; The capacitor is switched by a switch to form a parallel circuit with any section between the two batteries connected to each other; the capacitance of the capacitor group is the number of batteries in the battery pack minus one.

[0013] The balanced charging process of the present invention: at time 1, the control switch capacitor C1 is connected in parallel with battery B1, C2 is connected in parallel with B2, and so on, Cn-1 is connected in parallel with Bn-1; after the switch is turned on, the battery charges the capacitor, and the capacitor has two stages When the voltage is equal to the voltage of the two stages of the battery connected in parallel, the charging process ends; at time 2, the switching network performs switch...

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Abstract

The invention relates to a balance management system of a battery pack for an electric vehicle and belongs to the relevant technical field of power electronics. The balance management system comprises a battery pack, a switch network and a capacitor bank. The number of capacitors of the capacitor bank is one less than the number of batteries of the battery pack. According to the invention, parallel connected batteries are charged through the characteristic of capacitance, balance management of the battery pack of the electric vehicle is realized, the problem of unbalance of the traditional serially connected battery packs is effectively solved, the service life of the batteries is prolonged and the charge cost is reduced, thereby the running cost of the electric vehicle is decreased.

Description

technical field [0001] The invention relates to an electric vehicle battery group balance management system, which belongs to the related technical field of power electronics. Background technique [0002] The battery problem in the series battery pack is the key problem restricting the development of electric vehicles. When batteries are used in series in electric vehicles, the cycle life and performance of battery packs are greatly affected compared to single cells. A large number of research results show that this is caused by the inconsistency between the single cells in the battery pack. Among the factors that cause the inconsistency of the battery pack, in addition to the differences caused by the manufacturing process of the battery itself, the single battery during use The imbalance between charging and discharging is the main reason that affects the service life of the battery pack. Batteries used in electric vehicles need to be charged and discharged frequently, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00
Inventor 李海泉罗德义
Owner 大连大工安道船舶技术股份有限公司
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