Dynamic on-line measurement method of internal temperature of lithium ion battery

Abstract

The invention discloses a dynamic on-line measurement method of an internal temperature of a lithium ion battery. The dynamic on-line measurement method of the internal temperature of the lithium ionbattery comprises the steps that a temperature sensor for detecting a current lithium ion battery ambient temperature and an impedance phase angle detecting device for detecting a lithium ion batteryimpedance phase angle are installed on the lithium ion battery in a new energy vehicle; the relaxation time of the new energy vehicle is detected, and a dynamic impedance phase angle of the lithium ion battery in the relaxation time is measured by the impedance phase angle detecting device; a static impedance phase angle of the lithium ion battery at the moment is calculated by the dynamic impedance phase angle; looking up is carried out to obtain the static temperature of the lithium ion battery corresponding to the static impedance phase angle; and the dynamic temperature of the lithium ionbattery at the moment is calculated by the static temperature of the lithium ion battery. The dynamic on-line measurement method of internal temperature of the lithium ion battery has the advantages that internal temperature of the lithium ion battery can be accurately and quickly calculated by measuring dynamic impedance phase angle of the new energy vehicle, and dynamic on-line measurement of the lithium ion battery is achieved.

Description

technical field [0001] The invention relates to the field of temperature detection of lithium ion batteries, in particular to a dynamic online measurement method for the internal temperature of lithium ion batteries. Background technique [0002] With the development of society and the passage of time, the non-renewable energy sources on the earth are gradually decreasing, and all countries are promoting sustainable energy development technologies. The automobile industry is also vigorously developing green and sustainable new energy as the main energy source. In the context of the global promotion and use of new energy vehicles, new energy vehicles will definitely replace traditional fuel vehicles in the future. At this stage, the new energy that is mainly promoted and used in various countries is mainly electric energy, which is stored in the power battery of new energy vehicles. Therefore, the safety and reliability of the power battery have become an important factor tha...

AI Technical Summary

Problems solved by technology

[0003] New energy vehicles are equipped with a battery management system to manage the use of power batteries. The battery management system will detect the detected temperature signal. If the battery temperature is too high, it will send a signal to the motor controller to reduce the output power. The thermal management system in new energy vehicles strengthens the external exchange capacity of lithium-ion batteries. If the battery temperature measurement is inaccurate, it will affect the diagnosis of the battery management system. Once the battery temperature reaches the critical point and continues to heat up, it will cause lithium-ion batteries. Loss of control, leading to serious safety accidents

Images