A modeling method for thermal runaway of lithium-ion batteries
A technology of lithium-ion battery and modeling method, applied in the battery field, can solve the problems of voltage drop, can not simulate the attenuation of battery capacity at the same time, and achieve the effect of expanding the application range
Active Publication Date: 2017-05-31
TSINGHUA UNIV +1
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[0004] However, the existing lithium-ion battery thermal runaway model can only simulate the heat generated by internal chemical reactions, that is, to simulate the increase of battery temperature, but cannot simulate the attenuation of battery capacity at the same time, that is, to simulate the drop of battery voltage, and then Analyze battery life decay
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[0022] The present invention will be described in further detail below in conjunction with the accompanying drawings.
[0023] see figure 1 , an embodiment of the present invention provides a modeling method for thermal runaway of a lithium-ion battery, which includes the following steps:
[0024] S1: Provide a first lithium-ion battery, conduct adiabatic runaway experiments on the first lithium-ion battery, and record the temperature T '(t) of the first lithium-ion battery at different times, and the voltage V ' at different times (t);
[0025] S2: According to the temperature T'(t) and the voltage V'(t), divide the adiabatic thermal runaway process of the first lithium-ion battery into stages, and determine the chemical reactions corresponding to different stages; and
[0026] S3: According to the chemical reactions corresponding to different stages, establish the mathematical model {T(t), V(t)} of the first lithium-ion battery during the adiabatic runaway experiment, and ...
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The invention provides a lithium-ion battery thermal runaway modeling method. The lithium-ion battery thermal runaway modeling method comprises the following steps: providing a first lithium-ion battery, performing an adiabatic thermal runaway experiment on the first lithium-ion battery, and recording temperatures T'(t) and voltages V'(t) at different times of the first lithium-ion battery; according to the temperatures T'(t) and the voltages V'(t), performing stage division on an adiabatic thermal runaway process of the first lithium-ion battery, and determining corresponding chemical reactions at different stages; according to the corresponding chemical reactions at different stages, establishing a mathematical Model [T (t), V (t)] of the first lithium-ion battery during the adiabatic thermal runaway experiment, and calibrating the mathematical Model [T (t), V (t)] according to the T'(t) and the V'(t).
Description
technical field [0001] The invention belongs to the field of batteries and relates to a modeling method for thermal runaway of lithium ion batteries. Background technique [0002] Under the dual pressure of energy crisis and environmental pollution, the electrification of automobile power system has become one of the important symbols of automobile development. At present, the power battery system of new energy vehicles mostly uses power batteries with high energy density, such as lithium-ion power batteries. However, sporadic safety accidents make lithium-ion battery systems questionable. [0003] Battery system accidents are generally caused by thermal runaway of the battery. Battery thermal runaway refers to the process of instantaneously converting chemical energy into thermal energy due to the internal materials of the battery at a certain temperature. During the thermal runaway process of the battery, the heat generated by the internal chemical reaction increases th...
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IPC IPC(8): G06F19/00
Inventor 冯旭宁张明轩欧阳明高卢兰光何向明武鹏C·库珀史德芬
Owner TSINGHUA UNIV