Equilibrium control circuit for multi-battery set

Abstract

The invention provides a multi-battery pack balancing circuit comprising a plurality of battery packs Cell(1)-Cell(M), a plurality of balancing shunt circuits, and a plurality of balancing control circuits Module(1)-Module(M); each battery pack comprises a plurality of electric cores which are connected in series; the balancing shunt circuits correspond to each electric core; the balancing control circuits Module(1)-Module(M) are correspondingly connected with the battery packs, respectively; each balancing control circuit comprises a plurality of voltage detection terminals and control terminals, wherein, every two voltage detection terminals are sequentially connected with positive and negative electrodes of various electric cores in each battery pack respectively; furthermore, the control terminals correspond to driving terminals which are sequentially connected to the balancing shunt circuits of each electric core; moreover, in the Module(m), one of voltage sampling terminals is connected with the positive electrode of one electric core cell (m plus 1)1 controlled by the Module (m plus 1); and in the Module(m), one of the control terminals and the corresponding control terminal of the electric core cell(m plus 1)1 in the Module (m plus 1) are connected to the driving terminal of the balancing shunt circuit of the electric core cell (m plus 1)1 together. The multi-battery pack balancing circuit realizes the balance of the electric cores among the multiple battery packs.

Description

Multi-battery balance control circuit technical field The invention relates to a battery equalization circuit and method, in particular to an inter-battery balance circuit and method. Background technique Battery cells (including cells of various materials) are generally used in series to obtain a larger total voltage to drive a load. However, when multiple strings of batteries are used in series, due to inconsistent characteristics of the batteries or inconsistent initial battery voltages, the voltages on the batteries will be inconsistent during use, which will affect the life of the series battery pack. Therefore, it is necessary to make the voltage between the cells consistent or within a certain range of difference, which we call cell balancing. In the current market, the balance of each battery cell in the battery is mostly realized by a protection module (including a single chip), and a multi-string battery cell protection module has appeared. However, the number...

AI Technical Summary

Problems solved by technology

However, the number of cells that can be balanced by each protection module is certain, so when the number of series cells required exceeds the number that the module can protect, multiple modules need to be combined to support a greater number of cells. Balance, then you will face the problem of cell balance between all multiple protection modules

Since each battery protection module only balances the cells connected to it, when the equalization of multiple strings of cells connected to each protection module is completed, the voltage difference between the cells connected to different protection modules may be will be larger, and it will not be possible to achieve equilibrium

For example, the voltage of each cell protected by the first protection module is 4.1V or 4.1~4.12V, while the voltage of each cell protected by the second protection module is 4.15V or 4.15~4.153V, thus causing Unbalanced cells between two protection modules

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