Battery voltage balancing device and battery charging device

Abstract

The invention relates to a battery voltage balancing device and a battery charging device. The battery voltage balancing device comprises a balance determination unit and a conversion unit, wherein the balance determination unit is connected with a plurality of battery units which are connected in series and judges whether to start a battery voltage balancing program or not according to battery voltage of each battery unit; the conversion unit is provided with an energy storage circuit and is connected with the plurality of battery units; and energy is stored for the energy storage circuit and the energy storage circuit is selectively connected in parallel to charge at least one battery unit in the plurality of battery units in the battery voltage balancing program, so that the battery voltage difference of any two battery units in the plurality of battery units is reduced to be within a predetermined value. Through the battery voltage balancing device and the battery charging device provided by the invention, the cost of a battery balance controller can be reduced, the conversion efficiency of the battery voltage is improved, and the problem of shortened service life of a battery is also solved.

Description

technical field [0001] The invention relates to a battery voltage balancing device and a battery charging device, in particular to a battery voltage balancing device and a battery charging device which perform battery voltage balancing through power storage and conversion. Background technique [0002] With the development of portable electronic products, the demand for rechargeable batteries also arises. Rechargeable batteries include existing nickel-cadmium batteries, subsequent development of nickel-metal hydride batteries, lithium-ion batteries and the latest development of lithium polymer (Li-Polymer) batteries. Different types of rechargeable batteries provide different voltages, and the operating voltages required by portable electronic products are also different. Therefore, battery manufacturers will match the operating voltage of portable electronic products, and connect several batteries in series to form a battery module to provide the required voltage. [0003...

AI Technical Summary

Problems solved by technology

[0006] However, after the battery voltage needs to be converted into a digital signal by an analog / digital converter, the digital battery balancing microprocessor 5 can be processed, and the analog / digital converter will greatly increase the chip area of ​​the digital battery balancing controller 10, so the cost fairly high is its downside

In addition, the digital battery balance controller adjusts the charging rate of each battery through the current shunting method through the resistors R1-R7, and the way of shunting the current through the resistors not only causes unnecessary power consumption and generates excess heat

Especially for the charging state of high current charging or fast charging, the battery will be charged in a higher operating environment and shorten the service life of the battery

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