Battery charging balance and overvoltage alarm circuit and control method thereof

Abstract

The invention relates to a battery charging balance and overvoltage alarm circuit and a control method thereof. The charging balance and overvoltage alarm circuit comprises a plurality of charging balance and overvoltage alarm circuits, and the battery detection end of each charging balance and overvoltage alarm circuit is connected with each single battery connected in series in a battery pack; the charging balance and overvoltage alarm circuit comprises a single-chip microcomputer, a three-terminal voltage-regulator tube, a photoelectric coupler, a light-emitting diode, first to sixth resistors and a field-effect tube. Wherein, the second resistor and the three-terminal voltage stabilizing tube provide reference voltage, the single-chip microcomputer performs battery voltage detection, indication and control functions, the light emitting diode and the third resistor perform balance work state indication, the fourth resistor and the photoelectric coupler perform a battery overvoltagealarm function, and the field effect transistor, the fifth resistor and the sixth resistor perform a balance discharge function. According to the invention, voltage balance of all single batteries inthe battery pack can be completed, it is ensured that all single batteries are not overcharged, the safety is improved, and the overall service life of the battery pack is prolonged.

Description

technical field [0001] The invention relates to a battery charge balance and overvoltage alarm circuit and its control method, which is mainly used in battery packs with multiple batteries connected in series. Battery connection, so that each single battery in the battery pack reaches the preset voltage value when charging is completed, so as to achieve the purpose of charging balance, and make the single battery have overvoltage alarm output control protection when it is overcharged effect. Background technique [0002] With the rapid development of the battery industry, there are more and more applications of multi-cell batteries in series, such as electric bicycles, electric vehicles, energy storage systems, communication backup battery packs and other fields. When the battery is used in series, due to the inconsistency of the battery, the state of charge of the battery pack will be inconsistent and out of balance, which will cause some internal cells to be overcharged w...

AI Technical Summary

Problems solved by technology

[0003] The existing battery balancing method on the market is realized by the front-end analog detection chip of the battery management system (AFE chip for short), which is characterized by small balancing current, low voltage accuracy of balancing control (generally ±20mV), low balancing efficiency, When the consistency of the single battery is poor, a good balance effect cannot be achieved, and the balancing circuit has no indication function when it is working. This type of balancing circuit does not have the function of a single battery overvoltage alarm

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