Multi-time-scale comprehensive early warning method for lithium iron phosphate battery

A lithium iron phosphate battery, multi-time scale technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problems of potential safety hazards of lithium iron phosphate batteries, inability to realize timely alarm, etc., and achieve the effect of improving the speed of early warning

Pending Publication Date: 2021-11-30
HARBIN UNIV OF SCI & TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that there are serious safety hazards in the use process of the existing lithium iron phosphate battery, and the problem that timely alarm cannot be realized, and a multi-time scale comprehensive early warning method for lithium iron phosphate battery is proposed

Method used

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  • Multi-time-scale comprehensive early warning method for lithium iron phosphate battery
  • Multi-time-scale comprehensive early warning method for lithium iron phosphate battery
  • Multi-time-scale comprehensive early warning method for lithium iron phosphate battery

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specific Embodiment approach 1

[0060] Specific implementation mode one: the following combination figure 1 Describe this embodiment, a multi-time scale comprehensive early warning method for lithium iron phosphate batteries described in this embodiment,

[0061] The method includes:

[0062] Set the voltage difference minor fault threshold ΔU of the battery 1 , voltage difference medium fault threshold ΔU 2 , voltage difference severe fault threshold ΔU 3 ;

[0063] Voltage difference change rate minor fault threshold U rate1 , the voltage difference rate of change medium fault threshold U rate2 , the voltage difference change rate critical fault threshold U rate3 ;

[0064] Battery temperature peak critical fault threshold T max3 , battery temperature peak rate of change severe fault threshold dT max3 , battery heat generation internal resistance difference fault threshold ΔR max ;

[0065] Slight fault threshold ΔSOC1 of remaining battery power, medium fault threshold ΔSOC2 of remaining battery...

specific Embodiment

[0119] For the case where the internal short-circuit resistance of the cell is 5Ω, the short-circuit internal resistance is small at this time, and the early warning strategy based on voltage consistency is not effective, and it takes more than 48000s to realize the early warning alone. Although the strategy based on the consistency of the internal resistance of heat generation can quickly detect abnormalities, since temperature is a relatively indirect physical quantity and is affected by environmental conditions and the spatial distribution of batteries in the battery module, it is difficult to detect abnormalities based on the internal resistance of heat generation. The difference in resistance distinguishes different fault levels. At this time, the early warning strategy based on the consistency of the state of charge has a very good effect. Although the estimated value of the state of the internal short-circuit battery lags behind the actual state of the battery, from the ...

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Abstract

The invention discloses a multi-time-scale comprehensive early warning method for a lithium iron phosphate battery, which belongs to the technical field of safe use of batteries. The problems that serious potential safety hazards exist in the using process of an existing lithium iron phosphate battery, and timely alarming cannot be achieved are solved. The method comprises the following steps of acquiring terminal voltage, temperature and residual electric quantity of each battery monomer in the lithium iron phosphate battery in real time, calculating average terminal voltage of all the battery monomers, extracting a minimum voltage value of the terminal voltage of the battery monomers, and calculating a voltage difference and a voltage difference change rate, and comparing the voltage difference, the temperature, the residual electric quantity, the voltage difference change rate, the heat production internal resistance difference value delta R and the highest temperature of the battery with corresponding threshold values respectively, recording scores, comprehensively judging faults, and realizing battery fault early warning. The method is suitable for battery safety early warning.

Description

technical field [0001] The invention belongs to the technical field of safe use of batteries. Background technique [0002] Renewable energy technology has been widely used in power generation systems due to its advantages of low carbon and environmental protection. However, due to the instability of renewable energy such as wind energy and solar energy, the application of energy storage systems has become an indispensable part of the renewable energy generation system. Lithium iron phosphate batteries have been widely used in energy storage power station systems due to their long life, high energy density, and high power density. However, frequent fire accidents in energy storage power stations in recent years have caused public anxiety about the safety of large-scale lithium-ion battery energy storage systems. In 2018, a fire accident occurred at a wind farm in South Korea. In 2019, a fire and explosion accident occurred in a 2.47MWh lithium battery energy storage syste...

Claims

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Application Information

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IPC IPC(8): G01R31/389G01R31/392G01R31/388G01R31/396
CPCG01R31/389G01R31/392G01R31/388G01R31/396
Inventor 吴晓刚陈宇崔智昊杜玖玉
Owner HARBIN UNIV OF SCI & TECH
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