Lithium ion battery charge and discharge protection device

Abstract

The invention relates to a lithium ion battery charge and discharge protection device which comprises three voltage comparers, three voltage dividing potentiometers, two AND logic gates, a not logic gate, a field-effect tube, a green light-emitting diode and a red light-emitting diode. The first voltage comparer and the second voltage comparer are respectively used for comparing the real-time voltage of a lithium ion battery with the set voltage of each voltage dividing potentiometer in a charge process, the third voltage comparer is used for comparing the set voltage of the third voltage dividing potentiometer with the voltage drop at the two ends of the field-effect tube when current passes through the field-effect tube. When the output signals of the second AND logic gate are in high level, the field-effect tube is turned on, and the green light-emitting diode lights to indicate that the lithium ion battery is charged and discharged normally. When the output signals of the second AND logic gate are in low level, the field-effect tube is turned off, the output signals of the not logic gate are in high level, and the red light-emitting diode lights to indicate that a charge and discharge circuit of the lithium ion battery is disconnected. The lithium ion battery charge and discharge protection device is simple in circuit, small in size and capable of guaranteeing charge and discharge safety.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a charging and discharging protection device for lithium ion batteries. Background technique [0002] With the widespread application of lithium-ion batteries, more and more people pay attention to their use methods and technologies. Lithium-ion batteries refer to secondary batteries in which the embedded compound is the positive and negative electrodes. As a green high-energy rechargeable battery, since its birth in the early 1990s, it has been characterized by its small size, high voltage, large specific energy, and long charge-discharge cycle life. , stable discharge performance, less self-discharge and other advantages, gradually applied to more and more fields. Lithium-ion batteries have high requirements for charge and discharge control and protection circuits, and overcharge, overdischarge, and overcurrent phenomena should be strictly avoided during use. The higher the...

AI Technical Summary

Problems solved by technology

In the overcharged state, the energy will be surplus after the temperature of the battery rises, and gas will be generated due to the decomposition of the electrolyte, which will cause spontaneous combustion or rupture due to the increase in internal pressure, while in the overdischarged state, the decomposition of the electrolyte will cause battery characteristics and durability Deterioration, reducing the number of times the battery can be charged

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