A balance circuit and device for series battery pack

Abstract

A balancing circuit and device for a battery pack in series, characterized in that it also includes: two movable contact pieces driven by electric motors move or rotate on metal sheets electrically connected to each battery node and insulated from each other An electric transfer switch, a motor control circuit, and a boost circuit are composed; the movable contact of one electric transfer switch is electrically connected to the input terminal of the voltage boost circuit, and the movable contact of the other electric transfer switch is electrically connected to the voltage boost circuit The output end of the switch, the two moving contacts on the transfer switch can be moved or rotated, selectively electrically connected to the two ends of any battery in the series battery pack; the two moving contacts on the electric transfer switch are electrically connected to a voltage comparison circuit At the same time, a counter is provided, and the output of the voltage comparison circuit and the output of the counter finally control the rotation and stop of the motor on the electric transfer switch through the gate circuit.

Description

technical field [0001] The invention relates to an equalizing circuit and device for series battery packs, which can prevent battery chips in series battery packs from overcharging or overdischarging, prevent battery chips or loads from short-circuiting, and especially allow the battery pack chips to balance each other Circuits and devices, and prevent excessive voltage of series battery packs from causing unsafe factors to the human body. Background technique [0002] Large battery packs are gradually used, especially with the shortage of oil, the emergence of solar cells and electric vehicles, large-capacity battery packs are required, but since the voltage of a single battery is only 2.0-3.7V, it must be used in series to reach the load voltage. At the same time, some batteries such as lithium batteries cannot be overcharged or overdischarged, otherwise, the battery chips will be damaged, and the capacity of each battery chip must be kept constant during series use to ens...

AI Technical Summary

Problems solved by technology

In the past, MOS tubes and resistors were used for equalization. Due to the heat generated by the resistors, the discharge current cannot be too large, and the equalization effect is limited. Using the coil energy conversion method, the circuit is complicated, and the equalization effect is not very ideal. The number of charge and discharge times can only be between 200-600 times, which is too far from the 2000 times of charge and discharge times of a single lithium battery chip, making the cost performance of lithium battery packs less than that of lead-acid batteries and lithium battery packs The use of

If there are too many batteries connected in series and the voltage is too high, at some point, if the electric car collides or enters water, it will cause unsafe factors to the human body

Images