NTC-based battery temperature protection circuit

Abstract

The invention discloses an NTC (Negative Temperature Coefficient)-based battery temperature protection circuit in the field of integrated circuit design. The battery temperature protection circuit comprises a battery protection circuit, the input end of the battery protection circuit is connected with a comparison control circuit, two input ends of the comparison control circuit are respectively connected with a temperature sensing circuit and a reference circuit, and an NTC thermistor is arranged in the temperature sensing circuit. Temperature detection is achieved through the NTC thermistor, over-temperature control is achieved through an operational amplifier and a control MOS tube, then temperature protection of the battery is achieved, the whole circuit structure is simple in design, and the design requirements of an existing highly-integrated and miniaturized integrated circuit are met; in addition, the sensitivity adjustment requirement of the system circuit can be met by adjusting the resistance value ratio of a reference resistor and the NTC thermistor in a branch circuit according to the requirement, the sensitivity of the whole battery temperature protection circuit is greatly improved, and the battery temperature protection circuit has high flexibility and practicability.

Description

technical field [0001] The invention relates to the field of integrated circuit design, in particular to an NTC-based battery temperature protection circuit. Background technique [0002] With the development of science and technology, the application of emerging batteries such as lithium-ion batteries is gradually increasing. The battery is very sensitive to temperature. The material and performance of the lithium battery itself determine that it cannot be charged and discharged at ultra-high temperature and ultra-low temperature. In the low temperature state, the activity of the battery will decrease sharply, and the capacity will drop sharply, and low temperature charging will have a great impact on the chemical characteristics of the battery. In the high temperature state, the chemical activity of the battery increases greatly, so the stability of the battery chemical substance drops sharply, and the safety guarantee of the battery is greatly reduced. However, most exi...

AI Technical Summary

Problems solved by technology

In the low temperature state, the activity of the battery will drop sharply, and the capacity will drop sharply, and low temperature charging will have a greater impact on the chemical characteristics of the battery

In the high temperature state, the chemical activity of the battery is greatly increased, so the stability of the battery chemical substance drops sharply, and the safety of the battery is greatly reduced.

However, most of the existing batteries do not have temperature protection, which increases the hidden danger of using batteries.

[0003] In the prior art, there are also some technologies that can protect the charging and discharging of the battery, but in these applications, it is necessary to design a separate circuit to collect the temperature of the battery, and then form a feedback signal to control the working state of the battery, which leads to the charging and discharging of the battery. The structure of the temperature protection circuit is very complicated, and the detection sensitivity is also low, which is not conducive to the efficient utilization and sustainable development of energy, and is also not conducive to the integrated design of the circuit

Images