High-capacity LFP battery thermal runaway early warning method based on gas precipitation characteristics

A thermal runaway, large-capacity technology, applied in the direction of lithium batteries, secondary batteries, non-aqueous electrolyte batteries, etc., can solve problems such as thermocouple or temperature sensor internal and external temperature error, early warning failure, and susceptibility to external disturbances, etc.
CN114695986AInactive Publication Date: 2022-07-01XIANGTAN UNIV
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Patent Information

Authority / Receiving Office
CN Β· China
Current Assignee / Owner
XIANGTAN UNIV
Publication Date
2022-07-01
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

The invention discloses a high-capacity lithium iron phosphate (LFP) battery thermal runaway early-warning method based on gas precipitation characteristics, and relates to a thermal runaway early-warning scheme for a high-capacity LFP battery in the storage and charge-discharge processes, in the early stage of thermal runaway of the battery, characteristic gas is monitored, an improved Goertzel algorithm is introduced to filter concentration signals, and a high-capacity LFP battery thermal runaway early-warning result is obtained. And the precision of single detection is improved. The early warning judgment is realized by utilizing the combination of the early separated VOC and CO2, the concentration value and the concentration rising rate of the VOC are calculated in the time difference of separating out different gases in the operation process of an early warning program, and a plurality of calculation results are compared with a set threshold value, so that a more accurate early warning function is realized.
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Description

technical field

[0001] The present invention relates to a thermal runaway warning method for a large-capacity lithium iron phosphate (LFP) battery based on gas evolution characteristics, which relates to a thermal runaway warning scheme for a large-capacity LFP battery during storage and charging and discharging. Real-time monitoring of the generated flammable and explosive gases and start an alarm. Background technique

[0002] In recent years, in order to alleviate the energy dilemma, the state has actively supported and developed the new energy industry. Lithium-ion batteries have become an important development direction in the field of new energy due to their good electrochemical performance, strong anti-interference ability, and environmental friendliness. Lithium batteries are the most important part of electric vehicles and energy storage power stations, and play an important role in energy storage and conversion. However, due to the limitations of its own material...

Claims

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