Thermal safety monitoring method for lithium ion battery under dynamic pressure and variable temperature conditions

A lithium-ion battery, safety monitoring technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problems of inaccurate selection of critical value of characteristic parameters of battery thermal runaway, without considering sensor delay and error, etc., to achieve good transplantation performance, improve efficiency and accuracy, and evenly heat the effect

Pending Publication Date: 2020-10-02
CIVIL AVIATION FLIGHT UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the delay and error from the sensor are not considered in the existing lithium-ion battery safety monitoring, and the influence of external working conditions such as environmental pressure on the thermal runaway behavior of the battery itself is not considered. The selection is inaccurate, the pu...

Method used

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  • Thermal safety monitoring method for lithium ion battery under dynamic pressure and variable temperature conditions
  • Thermal safety monitoring method for lithium ion battery under dynamic pressure and variable temperature conditions
  • Thermal safety monitoring method for lithium ion battery under dynamic pressure and variable temperature conditions

Examples

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Embodiment 1

[0053] Such as figure 1 As shown, Embodiment 1 is a thermal safety monitoring method for lithium-ion batteries under the condition of dynamic pressure and variable temperature. Input the data collected by each monitoring sensor into the external data processor in real time to complete the collection and monitoring of multiple parameters of the lithium-ion battery; screen the parameters and input the monitored parameters into the thermal runaway warning system of the lithium-ion power battery, if the battery The temperature exceeds T>T safe , then it is judged that the battery is in danger of thermal runaway, and the monitoring is continued; if it does not exceed, it is judged that the battery is in a safe state, and the system enters standby; further combined with the change of pyrolysis flue gas concentration, open circuit voltage change, and temperature rise rate change to judge the battery Whether thermal runaway occurs, the judgment result is that the battery has thermal ...

Embodiment 2

[0055] Such as figure 2 As shown, a lithium-ion battery thermal safety monitoring device using the method of Example 1 under the condition of dynamic pressure and variable temperature. Build the experimental inner cabin, its specification is: 800x600x600mm, the experimental cabin can effectively prevent fire and explosion and prevent the damage of battery spray. An electronic scale 2 is arranged at the bottom of the inner cabin of the experiment to record the quality change of the battery before and after thermal runaway; the battery is fixed by a special clamping frame 3 and the open circuit voltage data is conveniently collected; the radiation heat runner 4 is arranged to simulate a real external heat source, and the lithium The ion battery 5 carries out 360° radiation heating of the ring body, and the temperature and temperature rise rate can be controlled; the thermocouple groups 10 are arranged at equal intervals on the thermocouple bracket 9 and the surface of the lithi...

Embodiment 3

[0098] Embodiment 3 is based on Embodiment 2 and includes the following steps.

[0099] (1) Based on the existing experimental platform: dynamic pressure variable temperature experimental cabin and calorimeter, thermal runaway experiments of lithium-ion batteries of different quantities and scales can be realized, and the flight dynamic pressure variable temperature environment can be fully simulated, and the experiment has been well transplanted Parameters to be measured can be added according to specific needs (such as: voltage, internal resistance, smoke density and smoke composition, etc.);

[0100] (2) Build the inner cabin of the experiment, its specification is: 800*600*600mm, the experiment cabin can effectively prevent fire and explosion and prevent damage from battery spray. Arrange the radiation hot runner to simulate the real external heat source, and control the temperature and temperature rise rate; fix the battery through a special clamping frame and facilitate ...

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Abstract

The invention discloses a thermal safety monitoring method for a lithium ion battery under dynamic pressure and variable temperature conditions. The method comprises the steps of: S1, putting a lithium ion battery under dynamic pressure and variable temperature conditions, and continuously monitoring and obtaining a plurality of parameters of the lithium ion battery; S2, judging the battery body temperature of the lithium ion battery, and if the battery body temperature is higher than T<safe>, executing S3, T<safe> representing the self-heat-production starting temperature of the battery; andS3, judging whether the lithium ion battery is subjected to thermal runaway or not according to the change conditions of the multiple parameters, if the lithium ion battery is subjected to thermal runaway, directly giving alarm information, and otherwise, calculating the thermal runaway time of the lithium ion battery, and giving early warning information. According to the method, the influence ofexternal working conditions such as delay and errors from a sensor and environmental pressure on the thermal runaway behavior of the battery is fully considered, and the problem that the selection ofthe critical value of the thermal runaway characteristic parameter of the battery is inaccurate is solved. The method can give an alarm in time, and control measures can be effectively taken to prevent the heat propagation behavior of the lithium ion battery.

Description

technical field [0001] The invention relates to the field of lithium-ion battery safety, in particular to a thermal safety monitoring method for lithium-ion batteries under dynamic pressure and variable temperature conditions. Background technique [0002] With its high specific energy, long cycle life and excellent charge and discharge performance, lithium-ion batteries have become one of the main power sources for mobile communications, electronic products, electric vehicles and aerospace, and have been widely used in various fields. However, due to the fact that lithium-ion batteries are prone to thermal runaway disasters during transportation and use, the safety issues caused by them have become a bottleneck restricting their development. In the field of civil aviation transportation, the air transportation of lithium-ion batteries and lithium-ion Proposal bans have already been issued around the world, but lithium-ion devices such as mobile phones, computers, and chargi...

Claims

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Application Information

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IPC IPC(8): G01R31/367G01R31/382G01R31/371
CPCG01R31/367G01R31/382G01R31/371
Inventor 刘奕贺元骅郭君沈俊杰沈添源
Owner CIVIL AVIATION FLIGHT UNIV OF CHINA
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