Series-connection escape circuit for battery/capacitor bank

Abstract

The invention discloses a series-connection escape circuit for a battery / capacitor bank. The battery / capacitor bank is formed by serially connecting at least one single battery / capacitor, and the escape circuit comprises controllers, switches and parallel-connected diodes, wherein the quantity of the switches is equal to that of single batteries / capacitors; the power terminals of the switches are connected in parallel with the single batteries / capacitors; the control electrodes of the switches are connected with the controllers and control the on / off of the switches; the parallel-connected diodes are in the same quantity as the single batteries / capacitors and are connected in parallel with the single batteries / capacitors in a one-to-one correspondence manner; the sampling terminals of the controllers are connected with two ends of the shunt-wound diodes; and the on / off of the switches is controlled according to the direction of current flowing through the parallel-connected diodes. The series-connection escape circuit can avoid failures of the whole battery / capacitor bank, caused by heating of the parallel-connected diodes due to open circuit or larger internal resistance of the single batteries / capacitors connected in series, so that the service life of the battery / capacitor bank is prolonged.

Description

technical field [0001] The invention relates to a method for assembling single cells or capacitors to form a battery capacitor group in series, and is especially suitable for a large battery group structure in which a plurality of single cells and capacitors are connected in series. Background technique [0002] like figure 1 Shown: The connection method of the n batteries V10, V20,..., V(n-1)0, Vn0 or capacitors is the traditional series connection, which is less reliable. When any battery or capacitor is connected When there is no power output capability and its internal resistance is high, the entire power supply system will fail. Even if other batteries or capacitors are in good condition, once one of the batteries fails, the system will immediately fail. [0003] At present, the series connection method in the battery / capacitor group is through the direct series connection of the battery / capacitor cells, or connecting a unidirectional diode in parallel with each cell...

AI Technical Summary

Problems solved by technology

[0004] (1) Due to the differences in the internal resistance and capacity of the battery cells and the external environment, there are serious uneven voltage and uneven current phenomena during the charging and discharging process of the battery;

[0005] (2) Due to the problem of parallel uneven current caused by individual differences in batteries, a certain battery has been working in an overloaded state, thereby accelerating the attenuation of the life of the battery cell;

[0006] (3) For batteries / capacitors connected in series without parallel diodes, if one battery is open circuited, the entire modules connected in series will fail;

[0007] (4) For a battery / capacitor bank series circuit with parallel diodes, if the current flowing through the diodes is too large, a large power consumption will be generated on the diodes, which will lead to a decrease in system efficiency and reliability. If the diode burns out, the entire battery capacitor bank will fail

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