Safety protection method for lithium ion battery electric vehicle

A lithium-ion battery and safety protection technology, applied in the safety field, can solve problems such as inability to effectively prevent or suppress thermal runaway, battery thermal runaway, and easy spread of battery open flames

Active Publication Date: 2020-02-21
UNIV OF SCI & TECH OF CHINA +1
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current lithium-ion battery safety protection strategies mainly have the following deficiencies: (1) Most of the existing lithium-ion battery safety protection strategies operate after the battery thermal runaway, which cannot effectively prevent or suppress the occurrence of thermal runaway
(2) Most of the existing safety protection methods aim at extinguishing open flam

Method used

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  • Safety protection method for lithium ion battery electric vehicle
  • Safety protection method for lithium ion battery electric vehicle

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Embodiment Construction

[0063] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0064] When the temperature sensor in the battery box or the BMS system detects that the surface temperature of the battery exceeds 80±10°C, it is determined that the battery is abnormally heated, and the primary response is triggered. The BMS system will send an electrical signal to the main controller, which will then send the signal to each fractional controller and pumps via the CAN bus. Since all electromagnetic one-way valves are designed to be normally open, at this time, except for the sub-controller in the battery box where the abnormal temperature rise occurs, the other sub-controllers will receive the signal from the main controller, and close the solenoid valve after action. , to prevent the fire extinguishing agent from being released to other battery boxes causing unnecessary losses and reducing cooling efficiency.

[0065] In th...

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Abstract

The invention relates to a safety protection method for a lithium ion battery electric vehicle. The safety protection method mainly comprises a two-stage response mode, wherein the first-stage response is rapid cooling during abnormal heat production and temperature rise of a lithium ion battery, and the second-stage response is efficient fire extinguishing and cooling during thermal runaway of the lithium ion battery. The first-stage response and the second-stage response adopt the same hardware design and mainly comprise a pump set, a spray nozzle, a refrigerant, a temperature sensor, a CO sensor, a control unit and the like. The method is designed on the basis of a battery pack of the lithium ion battery electric vehicle, and multi-level and all-around protection can be carried out on battery safety through cooling before thermal runaway, fire extinguishing during thermal runaway and cooling after fire extinguishing according to different characteristics in the inoculation and development process of thermal runaway of the lithium ion battery.

Description

technical field [0001] The invention belongs to the technical field of safety, and relates to a safety protection method for an electric vehicle, in particular to a safety protection method capable of realizing a secondary response to the thermal runaway of a lithium-ion battery transferred to an electric vehicle. Background technique [0002] In recent years, with the emergence of environmental problems such as global warming and smog weather, the demand for new energy industries in various countries is increasing. The lithium-ion battery has become a leader in the new energy industry due to its high energy density and low self-discharge rate. At this stage, the annual constants of lithium-ion batteries and lithium-ion electric vehicles in my country are showing an upward trend year by year. However, due to the special properties of lithium-ion batteries, when the lithium-ion battery is in a state of abuse, it is very easy to form heat accumulation conditions, prompting an...

Claims

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Application Information

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IPC IPC(8): H01M10/613H01M10/625H01M10/635H01M10/6567A62C3/16
CPCH01M10/613H01M10/625H01M10/635H01M10/6567A62C3/16Y02E60/10
Inventor 王青松刘昱君付卫东赵星刘同宇张江伟段强领杨光华孙金华刘朝辉
Owner UNIV OF SCI & TECH OF CHINA
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