Battery management system and method with early warning function of lithium battery failure

A battery management system and early warning technology, applied in the direction of measuring electricity, measuring electrical variables, instruments, etc., can solve the problems of lack of early warning of faults, the influence of fire extinguishing functions, and system omissions, so as to improve accuracy and fault handling capabilities. , improve accuracy, enhance the effect of security

Active Publication Date: 2022-02-25
SHANDONG LUNENG SOFTWARE TECH
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AI Technical Summary

Problems solved by technology

[0008] However, the above-mentioned fire protection system uses the concentration of carbon monoxide as the main criterion for judging a battery fire, which is very susceptible to false alarms due to factors such as the environment or battery capacity. The fire extinguishing function is affected; in addition, the system collects a single parameter, and cannot comprehensively judge the system operation status when the battery system fails, and can only be used for fire extinguishing measures after the battery catches fire
[0009] At the same time, the inventors found that the main source of carbon monoxide gas is the insufficient reaction between the combustible gas released by the battery and oxygen, and its production time lags behind the alkane gas released by the early failure of the battery. Once the carbon monoxide exceeds the standard, it means that the battery enters the late stage of thermal runaway. Therefore, the system does not have the function of early warning of failures.
[0010] In addition, the content of CO produced by pyrolysis of lithium batteries varies greatly under different SOC (state of charge), for example, CO accounts for 3.2% in 30% SOC pyrolysis gas, and 13.1% for 100% SOC. In addition, the existing carbon monoxide sensor The detection accuracy is low, and only qualitative analysis is done, which cannot effectively characterize the severity of battery faults, and the system may miss or falsely report

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  • Battery management system and method with early warning function of lithium battery failure
  • Battery management system and method with early warning function of lithium battery failure

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Embodiment 1

[0034]Studies have shown that the main components of gas generated by battery failure are H2, CO2, CO, CH4, C2H4, C2H6, C3H8, etc. In the early stage of failure, the SEI film of the battery decomposes or the electrolyte reacts to produce more H2 and alkane gases. , Combustible gas reacts with O2 to produce more CO2, but the lack of O2 in the later period will lead to an increase in CO concentration, so a single gas detection is not enough to be used as an early warning of battery failure and a condition for starting a fire extinguishing device at the same time. In addition, the pyrolysis gas release of lithium batteries is greatly affected by factors such as battery state of charge (SOC) and battery temperature rise. The composition and content of the pyrolysis gas vary greatly under different environments, so a single gas is used as the detection method. means, it is also easy to cause false positives. Therefore, various types of gas sensors are integrated on a gas detection ...

Embodiment 2

[0054] In one or more embodiments, a battery management method with an early warning function for lithium battery failure is disclosed, including: collecting and storing parameter information such as battery cell voltage, charge and discharge current, temperature, and the concentration of the above three types of gases, The improved ampere-hour integration method is used to calculate the battery SOC, and the current battery operating status is comprehensively judged based on various sampling data. When the sampling parameter data is abnormal, the feature recognition is performed according to the model recognition algorithm, and the battery fault type is output and located.

[0055] If the temperature at the pole of the battery is too high during charging and discharging, but the voltage and temperature of the battery at other positions are normal, it should be caused by the loose connection of the pole terminal, which leads to excessive impedance and heat at the pole. At this ti...

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Abstract

The invention discloses a battery management system and method with an early warning function of lithium battery failure, comprising: a main controller and a gas concentration detection module connected to the main controller, the gas concentration detection module includes one or more built-in battery boxes Each gas detection unit includes a gas sensor and a data processing subunit. The data processing subunit collects various gas concentration data through different types of gas sensors, and transmits the collected data to the main control unit. The main controller judges the fault level of the battery according to the comprehensive analysis of the received concentration data of various gases and their proportions in the gas produced by the battery. Beneficial effects of the present invention: the combination of various gas sensors is used to detect the gas generated by the battery failure, and the concentration and composition ratio of the detected gas are analyzed and comprehensively calculated to accurately determine the battery failure level.

Description

technical field [0001] The invention belongs to the technical field of new energy applications, and in particular relates to a battery management system and method with an early warning function of lithium battery failure. Background technique [0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] With the development of lithium-ion battery technology, its market demand is expanding. Lithium-ion batteries have been widely used in electric vehicles, electrochemical energy storage and other fields. However, due to high energy density and unique electrochemical characteristics, lithium-ion batteries There are hidden dangers in terms of security and stability. Overcharge, overdischarge, and internal short circuit of the battery during use can lead to thermal runaway of the battery. Once it enters the thermal runaway state, a large amount of heat will be released, which ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/367G01R31/382
CPCG01R31/367G01R31/382
Inventor 王培仑李豹栾磊杨勇李壮胡勇何军田纪海强
Owner SHANDONG LUNENG SOFTWARE TECH
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