Lithium-ion battery pack power supply and communication automatic switching method

Abstract

The invention relates to a lithium-ion storage battery pack power supply and communication automatic switching method, which adopts a control system circuit composed of an anti-backflow circuit, an output switching control circuit, a charge switching control circuit, a switching detection and control circuit, a lithium-ion battery pack protection circuit, a power supply circuit, an electricity meter, a switching circuit of the electricity meter, and a electricity meter circuit, wherein the electricity meter is used for communicating with an external charger, the electricity meter circuit is used for communicating with a host computer. The control circuit adopted by the method integrates a battery protection function, an electricity meter function, a power supply switching function, a communication switching function and the like, is high in integration degree, has good compatibility, occupies small space, and can realize overcurrent protection, short-circuit protection, low-voltage protection and overcharge protection of the battery pack. The lithium-ion storage battery pack power supply and communication automatic switching method ensures that a system supplies power to electrical equipment in an uninterrupted manner, ensures the safety of circuit automatic control in the absence of external power supply equipment; and the circuit design is safe and reliable, the power consumption is small, the efficiency is high, the cost is low and the application effect is very significant.

Description

technical field [0001] The invention relates to an application system of a lithium-ion battery pack, in particular to a method for automatically switching power supply and communication of a lithium-ion battery pack. Background technique [0002] At present, many electrical equipments are powered by external power supply equipment and backup power supply to prevent losses caused by sudden power failure of external power supply equipment; lithium-ion batteries have been widely used in various applications due to their small size and light weight. Backup power for electrical equipment. In practical applications, the electric device needs to be able to charge the battery pack when it is connected to the battery pack charger during use, and both the electric device and the charger need to realize real-time monitoring of the power of the battery pack by communicating with the battery pack. [0003] The seamless switching method of the existing power supply mainly realizes that w...

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Problems solved by technology

[0003] The seamless switching method of the existing power supply mainly realizes that when the external power supply equipment is powered off, the battery pack can supply power to the electric equipment, while ignoring that when the battery pack is supplying power to the electric equipment, the voltage of the battery pack will be added to the output of the external power supply equipment. Terminal, so there is a great potential safety hazard and unnecessary power consumption

[0004] The output of the external power supply equipment in the uninterruptible power supply system directly charges the battery pack, which will cause the battery pack to be in a floating charge state when the external power supply equipment exists all the time, thus reducing the life of the battery pack; when the external power supply equipment does not exist , the communication interface between the battery pack and the charger is always in working condition, and there is also a great potential safety hazard

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