Equalized charging apparatus used for series batteries

Abstract

The invention relates to an equalizing charging device used for connecting a battery pack in series. The device comprises a parallel voltage stabilization integrated circuit U1, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4 and a triode Q, wherein the first resistor R1 and the second resistor R2 which are connected in series are arranged between the positive electrode B+ and the negative electrode B- of a battery, the cathode K of the parallel voltage stabilization integrated circuit U1 is connected with the positive electrode B+ of the battery after being connected with the third resistor R3 in series, the anode A of the parallel voltage stabilization integrated circuit U1 is connected with the negative electrode B- of the battery, the reference edge Vref of the parallel voltage stabilization integrated circuit U1 is energized between the first resistor R1 and the second resistor R2, the emitting electrode e of the triode is connected to the positive electrode B+ of the battery, the base electrode b of the triode Q is connected to the cathode of the parallel voltage stabilization integrated circuit U1, and the collecting electrode c of the triode Q is connected to the negative electrode B- of the battery after being connected with the fourth resistor R4 in series. By using the device, the equalizing charging is carried out on the series-connected rechargeable lithium battery, thereby the service life of the battery pack can be greatly prolonged.

Description

technical field [0001] The invention relates to the technical field of lithium battery charging, in particular to a charging device for series battery packs. Background technique [0002] Among the existing mobile devices, especially some high-power electrical devices, such as laptop computer power supplies, industrial mobile device power supplies, large-capacity backup power supply equipment, electric bicycle power supplies, and even promising electric vehicle batteries, etc., need Provide a power supply with a voltage of more than ten volts, tens of volts or even hundreds of volts, while the voltage of commonly used battery cells is relatively low. The nominal voltage of lithium-ion batteries composed of lithium cobalt oxide and lithium manganese oxide materials is 3.7 volts. The nominal voltage of a lithium battery made of lithium iron phosphate is 3.2 volts. In order to achieve the output voltage of more than ten volts or higher required by electrical appliances, it is n...

AI Technical Summary

Problems solved by technology

After being added to the series battery pack, it can solve the problem of battery balance in the battery charging process, achieve the purpose of fully charging all batteries, and can effectively control the batteries in the series battery pack from overcharging, overcoming the The problem of inconsistent charging status of each battery by simple series charging can effectively solve the problem of inconsistent battery performance with the increase of charge and discharge times, so that the battery can be used safely throughout its lifespan. Since all batteries can be fully charged, Can greatly extend the service life of the battery pack

Images