Temperature protection circuit for lithium ion battery charging and discharging

Abstract

The invention discloses a temperature protection circuit for lithium ion battery charging and discharging, which comprises a battery charging and discharging circuit composed of a switch metal oxide conductor (MOS) tube Q4, a switch MOS tube Q1, a switch MOS tube Q2 and a peripheral circuit and a chip U1. The control end Q4-4 of the battery charging and discharging circuit is connected with a charging temperature control circuit unit and a discharging over temperature protection unit. The discharging over temperature protection unit is mainly composed of the U1, the Q1, the Q2 and a temperature protector TS. The charging temperature control circuit unit comprises a reference voltage supply circuit, a temperature sampling circuit, a voltage comparator, a Q5 and a Q6, wherein the voltage comparator is composed of a U2 and the peripheral circuit. The U2 is composed of U2A and U2B, and the reference voltage supply circuit is respectively composed of an R20, an R21, an R22 and an R23. The temperature sampling circuit is composed of an R19 and a temperature sensor TH1. The output end of the voltage comparator is connected with the Q5 connected with the Q6 in series, and the output end of the Q6 is connected with the control end Q4-4. The temperature protection circuit for lithium ion battery charging and discharging is low in self power consumption, high in reliability and capable of controlling charging and discharging temperature.

Description

technical field [0001] The invention relates to a temperature protection circuit, in particular to a temperature protection circuit for charging and discharging a lithium battery. Background technique [0002] Lithium-ion batteries are known as green energy. It is small in size, light in weight, large in capacity and pollution-free. It is gradually recognized by everyone and applied to various fields. Although lithium-ion batteries have many advantages, they also have a major disadvantage. That is, during use, if not protected, the battery will be overcharged, overdischarged, overcurrent, and overheated, causing damage to the battery, shortening its life, and in severe cases, it will explode and burn. Serious threat to people's lives. People often use special chips to control the overcharge, overdischarge, and overcurrent of the battery, while ignoring the overtemperature condition. When the battery temperature is too high or low, it will have a great impact on charging...

AI Technical Summary

Problems solved by technology

When the battery temperature is too high or low temperature, it will have a great impact on charging and discharging, which will destroy the internal structure of the battery and damage the battery.

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