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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.

Inactive Publication Date: 2016-08-17
ANHUI RNTEC TECH CO LTD
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AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a passive equalization control method, which overcomes the problem of very low efficiency of passive equalization in the prior art, realizes prolonging the equalization time, improving equalization efficiency, and improving the effect of equalization

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Embodiment Construction

[0021] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0022] The present invention provides a passive balance control method, the passive balance control method comprising:

[0023] Step 1, preset a passive equalization control circuit, and connect a power resistor and an equalization switch in parallel to each of the plurality of single cells connected in series;

[0024] Step 2: Charge the single battery through the passive equalization control circuit. When charging for the i time, the micro control unit detects the voltages of a plurality of the single batteries, and when the voltage of the m single batteries exceeds the threshold voltage , record the battery numbers of m single cells and perform voltage equal...

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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.

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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Application Information

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IPC IPC(8): H02J7/00
CPCH02J7/0014
Inventor 曾国建朱建余铿范晓东许海丽
Owner ANHUI RNTEC TECH CO LTD
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