Electric quantity equalization device and method for multiple battery cells in battery pack

A single battery and equalization device technology, applied in battery/fuel cell control devices, electric vehicles, electric traction, etc., can solve the problems of low battery equalization efficiency and large loss, achieve low loss, prolong service life, and improve consistency sexual effect
CN106985699APending Publication Date: 2017-07-28ANHUI RNTEC TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
ANHUI RNTEC TECH CO LTD
Publication Date
2017-07-28

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Abstract

The invention relates to the technical field of battery equalization and discloses an electric quantity equalization device and method for multiple battery cells in a battery pack. The electric quantity equalization device comprises an equalization module, an electric quantity detection module and a control device, wherein the equalization module is used for absorbing electric energy of the battery cells and using the electric energy to discharge other battery cells in the battery pack; the electric quantity detection module is used for detecting the electric quantity SOCnn of each battery cell; and the control device is used for calculating the average electric quantity of the battery cells, determining the battery cells with the electric quantity greater than the average electric quantity of the battery cells in the battery pack, and using the battery cells with the electric quantity greater than the average electric quantity of the battery cells in the battery pack to charge the equalization module, and then the equalization module is controlled to use the charged electric energy to discharge the battery cells with the electric quantity smaller than the average electric quantity of the battery cells in the battery pack. The electric quantity equalization device and method for the multiple battery cells in the battery pack achieve active equalization in the battery pack, effectively improve uniformity of the battery pack and prolong the service lives of the battery cells.
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Description

technical field

[0001] The invention relates to the technical field of battery balancing, in particular to a device and method for balancing electric power among multiple single batteries in a battery pack. Background technique

[0002] Affected by the energy crisis and environmental crisis, electric vehicles are developing rapidly, and lithium batteries, as the mainstream power source of electric vehicles, have attracted much attention. When lithium batteries are actually used in electric vehicles, they are all in the form of battery packs. However, due to the small performance differences of lithium batteries during production, the inconsistency of lithium battery packs in actual use will gradually increase. Balanced processing, increasing inconsistency will lead to the premature end of the life of the lithium battery pack.

[0003] The mainstream equalization methods are passive equalization and active equalization. Passive equalization is mainly through connecting a pow...

Claims

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