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Active equalization circuit for multi-monomer series battery

A technology of series battery packs and active equalization, which is applied in battery circuit devices, electric vehicles, circuit devices, etc., can solve problems such as complex structure of active equalization circuits, solve the problem of capacity and power inconsistency, good scalability, and circuit The effect of simple structure

Active Publication Date: 2012-12-19
CALB CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide an active equalization circuit for multi-cell series battery packs with a simple circuit to solve the problem of complex structure of the existing active equalization circuit

Method used

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  • Active equalization circuit for multi-monomer series battery
  • Active equalization circuit for multi-monomer series battery
  • Active equalization circuit for multi-monomer series battery

Examples

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example 2

[0020] Example 2: Balance from Cell12 to Cell10.

[0021] Assume that Cell12 has the highest voltage and Cell10 has the lowest voltage and the power is too low, so Cell12 needs to be balanced to Cell10. It is also assumed that an equalization period T is composed of the first half period t1 and the second half period t2, t1=t2=0.5T. First, turn on the MOS transistors S12B, S12A, M2 and M3 during the time period t1, and turn off all other MOS transistors at the same time, and the energy of Cell12 is stored in the primary side P of the converter (such as Figure 4 shown), the DC / DC converter works in the input mode; then, turn on the MOS transistors S10B, S10A, M1 and M4 at time t2, and turn off all other MOS transistors at the same time, and the energy stored in the primary side P of the converter is coupled to the secondary side S, and then the energy is transferred to Cell10 (such as Figure 5 As shown), the DC / DC converter works in the output mode; through the above two op...

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Abstract

The invention relates to an active equalization circuit for a multi-monomer series battery. The active equalization circuit comprises a DC / DC (direct current) convertor with an isolating transformer and a switch array, wherein the switch array consists of a set of positive pole switches of which one ends are respectively connected with the positive pole of each monomer battery and a set of negative pole switches of which one ends are respectively connected with the negative pole of each monomer battery, the other ends of the positive pole switches are in short connection with one another, so that a positive pole public end can be formed, and the other ends of the negative pole switches are in short connection with one another, so that a negative pole public end can be formed; and two input ends of the DC / DC convertor are respectively and correspondingly connected with the positive pole public end and the negative pole public end by a pair of input switches, and two output ends of the DC / DC convertor are respectively and correspondingly connected with the positive pole public end and the negative pole public end by a pair of output switches. Due to the scheme, the direct two-way energy transfer between any two monomer batteries can be realized, and the problem such as the inconsistency between the capacity and the electric quantity of the monomer batteries can be solved.

Description

technical field [0001] The invention relates to an active equalization circuit for a battery pack, in particular to an active equalization circuit for a power lithium battery pack with multiple cells connected in series. Background technique [0002] Lithium-ion batteries, especially lithium-ion power batteries, are becoming more and more widely used and have become an important direction for the development of new energy technologies. The larger the capacity of the single battery, the greater the difference in capacity of the single battery. There are two types of inconsistencies in the use of large-capacity lithium-ion batteries in groups. The first type of inconsistency is caused by differences in actual capacity, and the second type of inconsistency is caused by differences in initial power. Due to the inconsistency, one cell will be full first during charging, and another cell will be empty first during discharging. These defects limit the charge and discharge capacity...

Claims

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Application Information

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IPC IPC(8): H02J7/00
Inventor 吕少锋
Owner CALB CO LTD
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