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Implicit damage monitoring and thermal runaway early warning device for vehicle-borne lithium-ion power batteries and early warning method thereof

A power battery and damage monitoring technology, which is applied in secondary battery testing, secondary battery, secondary battery repair/maintenance, etc., can solve the problem of interruption of active safety system operation, active safety measures are difficult to fully function, control board damage, etc. problem, to avoid thermal runaway effect

Pending Publication Date: 2019-11-05
JILIN UNIV
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  • Application Information

AI Technical Summary

Problems solved by technology

Not only does it make it difficult for active safety measures to fully function, but the high heat of the battery itself will quickly damage the control board of the BMS, causing the system to go offline, thereby interrupting the operation of the active safety system of the vehicle battery

Method used

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  • Implicit damage monitoring and thermal runaway early warning device for vehicle-borne lithium-ion power batteries and early warning method thereof
  • Implicit damage monitoring and thermal runaway early warning device for vehicle-borne lithium-ion power batteries and early warning method thereof
  • Implicit damage monitoring and thermal runaway early warning device for vehicle-borne lithium-ion power batteries and early warning method thereof

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Embodiment Construction

[0085] The present invention will be further described in detail below in conjunction with the accompanying drawings, so that those skilled in the art can implement it with reference to the description.

[0086] Such as figure 1 As shown, before thermal runaway occurs, the internal structure of the battery must be damaged to a certain extent. As thermal runaway approaches, its internal damage continues to expand, triggering larger-scale side reactions, and eventually making it irreversible. For a well-structured lithium-ion battery, the electrolyte in the cell does not participate in chemical reactions, and there is no material exchange with the outside of the system under working conditions. When a safety-threatening damage occurs to a lithium-ion battery, no matter how small the damage is, the electrolyte in the cell will oxidize. The oxidation product will exchange material with the outside world in the form of gas. For this reason, indentation type pressure relief valve...

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Abstract

The invention discloses an implicit damage monitoring and thermal runaway early warning device for vehicle-borne lithium-ion power batteries. The device comprises a carbon dioxide and ethylene combined gas sensor which is arranged in a battery pack module and is used for detecting the concentration of carbon dioxide and ethylene gases, a pressure sensor which is disposed at an indentation type pressure relief valve of a battery case and is used for detecting an internal pressure of battery bodies, a perfusion pipeline which is disposed in the battery pack module and is uniformly provided withfoam holes for discharging flame-retardant foams, multiple solenoid valves which are disposed at the corresponding foam holes, a flame-retardant foam storage tank which is disposed outside the batteries and is in communication with the perfusion pipeline, and a controller which is connected to the carbon dioxide and ethylene combined gas sensor, the pressure sensor and the solenoid valves and areused for controlling the operation of the solenoid valves. The invention also discloses an early warning method of the implicit damage monitoring and thermal runaway early warning device for the vehicle-borne lithium-ion power batteries.

Description

technical field [0001] The invention relates to the technical field of hidden damage monitoring of a vehicle-mounted lithium-ion power battery, and more specifically, the invention relates to a device for monitoring hidden damage of a vehicle-mounted lithium-ion power battery and early warning of thermal runaway and an early warning method thereof. Background technique [0002] Electrification is the future of the automotive industry. As the core component of electric vehicles, the safety of power batteries is an important consideration for electric vehicles. The realization of forward-looking active safety protection measures for power batteries can greatly promote the popularization of electric vehicles. Lithium-ion batteries have become the mainstream choice for automotive power batteries due to their many advantages such as high capacity, high output voltage, high charging rate, high energy density, low self-discharge and excellent cycle characteristics. However, the hi...

Claims

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Application Information

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IPC IPC(8): H01M10/42H01M10/48
CPCH01M10/4207H01M10/425H01M10/4285H01M10/482H01M10/488Y02E60/10
Inventor 陈思言高振海肖阳
Owner JILIN UNIV
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