Passive balance control method

A passive equalization and control method technology, applied in charge equalization circuits, electric vehicles, electrical components, etc., can solve the problems of prolonged equalization time and low passive equalization efficiency, and achieve the effect of extending equalization time and improving equalization efficiency.
CN105871019AInactive Publication Date: 2016-08-17ANHUI RNTEC TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
ANHUI RNTEC TECH CO LTD
Publication Date
2016-08-17
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a passive equalization control method, which includes: 1. A passive equalization control circuit is preset, and a power resistor and an equalization switch are connected in parallel to each single battery of a plurality of series-connected single batteries; The battery is charged. When charging for the i time, the micro-control unit detects the voltage of multiple single cells. When the voltage of m single cells exceeds the threshold voltage, it records the battery number of m single cells and 3. When charging the i+1th time, directly perform voltage balancing on the m cells in the i-th charging; when the voltage of the m cells exceeds the threshold voltage, cover Record the battery number of the m cells in the i+1th charge and perform voltage equalization on the single cells; 4. Repeat step 2 and step 3 in sequence to perform voltage equalization. This method realizes the effect of prolonging the equalization time and improving the equalization efficiency.
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Description

technical field

[0001] The invention relates to the field of passive equalization control of power supplies, and in particular, relates to a passive equalization control method. Background technique

[0002] Large-capacity lithium battery packs are more and more widely used in new energy vehicles and large-capacity energy storage systems. Due to the differences in the production and use environments of lithium battery cells, as the usage time increases, the inconsistency between lithium battery cells will increase, which will affect the effective capacity of the battery. Therefore, an equalization circuit is needed to balance it. Improve the difference between lithium battery capacities.

[0003] At present, the passive equalization method of bypass resistor energy consumption and switch control is generally used to equalize the battery pack, but there are some difficulties in the design of this equalization method: when the battery is discharging, the voltage at the batter...

Claims

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