Battery thermal runaway alarm system based on PWM waves

An alarm system, thermal runaway technology, applied in secondary batteries, secondary battery testing, battery circuit devices, etc., can solve problems such as module deformation, cell explosion, chain explosion, etc.

Pending Publication Date: 2021-05-18
无锡明恒混合动力技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the structure is loose and the extrusion force is insufficient, the module will be deformed during the cell swelling process, the cell will shift, and the shifted cell will easily explode, eventually leading to the next chain explosion reaction

Method used

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  • Battery thermal runaway alarm system based on PWM waves
  • Battery thermal runaway alarm system based on PWM waves
  • Battery thermal runaway alarm system based on PWM waves

Examples

Experimental program
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Embodiment Construction

[0028] The present invention will be described in further detail below according to the drawings and embodiments.

[0029] The thermal runaway of the battery is specifically caused by the internal temperature of the battery causing the battery to break, and the spark generated during the eruption ignites the combustible gas. Therefore, the eruption of the battery is a necessary condition for external smoke, fire and explosion.

[0030] When the battery is thermally out of control, the pressure relief valve of the battery is opened and the smoke is sprayed in a state of high temperature and high pressure. The measured temperature is ≥300°C. This temperature is enough to melt the insulating film around the battery cell and the top insulating cover, and it has also exceeded the melting point of metal tin 231.89. ℃, the thermal runaway continued to develop to the open flame, and the highest measured temperature reached 1000 ℃.

[0031] In addition, before the thermal runaway press...

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PUM

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Abstract

The invention relates to the technical field of power battery systems, and concretely relates to a battery thermal runaway alarm system based on PWM waves. The system comprises an FPC board arranged above single batteries in a battery module, sampling nickel sheets are welded on two sides of the FPC board, a series tin wire is arranged at the bottom of the FPC board, and the series tin wire is positioned right above the positions of the pressure release valves of the single batteries; the sampling nickel sheet and the series tin wire are connected with the BMS module through a connector; and the BMS module comprises a PWM wave output unit used for outputting PWM waves to the series tin wires and a PWM wave receiving unit used for receiving the PWM waves sent back by the series tin wires, and further comprises a battery voltage unit used for receiving the voltage of the single battery acquired by the sampling nickel sheet. The system is simple in structure, low in failure rate and accurate in measurement result, and can realize double monitoring of thermal runaway occurrence and position positioning of the single batteries.

Description

technical field [0001] The invention relates to the technical field of power battery systems, in particular to a battery thermal runaway warning system based on PWM waves. Background technique [0002] Lithium-ion batteries have become the most widely used electrochemical power source because of their significant advantages such as high specific energy and long cycle life. However, the safety issue centered on thermal runaway is still an urgent problem to be overcome in the large-scale application of lithium-ion batteries. In order to ensure the safe operation of batteries, it is urgent to develop effective strategies for preventing and controlling thermal runaway of batteries. [0003] When thermal runaway of lithium-ion batteries occurs, it is usually accompanied by violent exothermic chemical reactions, causing hazards such as smoke, fire and even explosion. The state changes from thermal runaway to thermal spread in the prismatic battery module have common features: th...

Claims

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Application Information

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IPC IPC(8): H01M10/42H01M10/0525G01R31/3835
CPCG01R31/3835H01M10/0525H01M10/425H01M10/4257H01M10/4285H01M2010/4271Y02E60/10
Inventor 谢京冯子彬
Owner 无锡明恒混合动力技术有限公司
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