UPS lithium battery floating charge control circuit, lithium battery system and UPS lithium battery charging control method

Abstract

The invention discloses a UPS lithium battery floating charge control circuit, a lithium battery system and a UPS lithium battery charging control method. The UPS lithium battery floating charge control circuit comprises a first input end, a second input end, a first output end, a second output end, a first switch unit, a floating charge resistor and a control unit; the control unit is used for controlling the UPS lithium battery floating charge control circuit to be in a constant charge state or a floating charge state according to the current voltage of the lithium battery, a preset floating charge voltage and a floating charge entering voltage in a charging stage; the first end of the first switch unit is electrically connected with the first input end, the second end of the first switch unit is electrically connected with the first end of the floating charge resistor; the third end of the first switch unit is electrically connected with the first output end; and the resistance value of the floating charge resistor is determined by the preset floating charge voltage, the voltage entering floating charge, the power consumption of the UPS lithium battery floating charge control circuit and a preset formula. According to the UPS lithium battery floating charge control circuit, lithium battery system and the UPS lithium battery charging control method of the embodiment of the invention, the lithium battery can be in a floating charge and non-overcharge state for a long time.

Description

technical field [0001] The embodiments of the present invention relate to charging technology, and in particular to a UPS lithium battery floating charge control circuit, a lithium battery system, and a UPS lithium battery charging control method. Background technique [0002] As a clean, efficient and non-polluting energy storage component, lithium-ion batteries are increasingly being used in power, energy storage, UPS (Uninterruptible Power Supply, uninterruptible power supply) and other fields; among them, the UPS field has always been dominated by lead However, due to the low energy density, non-environmental protection and short life of lead-acid batteries, the use of lithium batteries to replace lead-acid batteries in the UPS field has become a research hotspot. [0003] However, due to its inherent electrochemical principles and characteristics, lead-acid batteries can support floating charging, and there is no need for battery management systems such as BMS and overc...

AI Technical Summary

Problems solved by technology

[0002] As a clean, efficient and non-polluting energy storage component, lithium-ion batteries are increasingly being used in power, energy storage, UPS (Uninterruptible Power Supply, uninterruptible power supply) and other fields; among them, the UPS field has always been dominated by lead However, due to the low energy density, non-environmental protection and short life of lead-acid batteries, the use of lithium batteries to replace lead-acid batteries in the UPS field has become a research hotspot.

[0003] However, due to its inherent electrochemical principles and characteristics, lead-acid batteries can support floating charging, and there is no need for battery management systems such as BMS and overcharging protection devices after the battery system is formed; however, long-term floating charging of lithium batteries will cause battery overcharging and then occur. Fire, explosion and other dangers, therefore, how to prevent overcharging of lithium batteries during float charging becomes particularly important

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