Combined lithium battery temperature detection circuit

Abstract

The invention relates to a combined lithium battery temperature detection circuit, which comprises a temperature measuring circuit. In a module formed by connecting N lithium batteries in series, a thermistor is connected with N-1 temperature switches in series, wherein the thermistor is used for detecting the temperature of one lithium battery; the N-1 temperature switches are respectively used for monitoring the temperature of the rest N-1 lithium batteries; two ends of a series circuit of the thermistor and the temperature switches are respectively connected with a first port and a second port of the temperature measuring circuit through a temperature signal acquisition line; and the operating temperature of the temperature switch is accordant with the operating limit temperature of the lithium battery, when the temperature of the temperature switch is lower than the limit temperature of the lithium battery, the temperature switch is conducted, and when the temperature of the temperature switch is more than the limit temperature of the lithium battery, the temperature switch is disconnected. The combined lithium battery temperature detection circuit has the advantages that the temperature of the lithium battery module can be measured and the temperature of all the lithium batteries can be protected by connecting two signal acquisition lines to the temperature detection circuit of a BMS (battery management system).

Description

technical field [0001] The invention relates to a circuit for detecting the temperature of a lithium battery, in particular to a combined lithium battery temperature detection circuit. Background technique [0002] With the promulgation of the national "Energy Saving and New Energy Automobile Industry Development Plan (2011~2020)", the lithium battery system, as the core part of electric vehicles, will usher in an opportunity for rapid development. [0003] Safety issues are one of the technical bottlenecks restricting the promotion and application of power lithium batteries in the field of new energy vehicles. The characteristics of lithium batteries determine the working window of voltage, current and temperature. Lithium batteries can only work within the specified window range of voltage, current and temperature, otherwise it will cause damage to lithium batteries and may cause safety hazards. In actual use, people use the power management system (BMS) to manage the vol...

AI Technical Summary

Problems solved by technology

However, with the further expansion of the application range of lithium battery modules, especially in the application of power systems, the discharge current is getting higher and higher, the volume of battery modules is also increasing rapidly, and the number of lithium batteries is also increasing. The above options The method of permanently measuring the temperature of some lithium batteries may bring hidden dangers to the safety of lithium battery modules

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