Power battery simulation method based on electric heating and thermal runaway coupling model
A power battery, coupled model technology, applied in design optimization/simulation, electrical digital data processing, CAD numerical modeling and other directions, can solve the lack of lithium battery temperature characteristics research, change situation discussion, simulation simulation and other problems, to achieve low cost , reliable research, widely applicable effects
Pending Publication Date: 2020-08-28
SOUTH CHINA UNIV OF TECH
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[0006] 2) Sun Yanxian (2019) of Harbin Institute of Technology published a paper "Simulation of thermal runaway diffusion of lithium-ion battery modules", which analyzed the thermal runaway of batteries, and proposed a lithium-ion battery module process based on the electrochemical-thermal coupling model. The simulation research method of thermal runaway diffusion, but this research method evaluates the heat generation of the battery cell based on the DC internal resistance under normal temperature conditions. The changes of various substances are discussed in depth, and there is a lack of research on the temperature characteristics of lithium batteries transitioning from a normal state to a thermal runaway state;
[0007] Ye Kewei (2020) of Southwest University of Science and Technology published a paper "Simulation Analysis and Research on Heat Generation Characteristics of VDA Square Power Lithium Battery". Under the condition of discharge rate and ambient temperature, the change of battery temperature field, but only considering the electrochemical heat generation of lithium battery under normal temperature state, did not simulate the heat generation of battery active material decomposition under the state of thermal runaway caused by ultra-high temperature of lithium battery
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[0023] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the embodiments and accompanying drawings.
[0024] Such as figure 1 As shown, it is an example flow of the power battery simulation method based on the coupling model of electrothermal and thermal runaway, including:
[0025] Step 10 Establish a geometric optimization model according to the power battery usage scenarios and simulation calculation needs, and determine the power battery geometric dimensions, thermophysical parameters, and electrochemical parameters;
[0026] The battery cell is a cylinder, the geometric dimensions include a diameter of 18mm, and a height of 65mm. The thermal and physical parameters of the battery include: k_r is the radial thermal conductivity of the battery 15w / m k, k_ang is the axial thermal conductivity of 30w / m k, C p is the battery specific heat capacity...
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The invention discloses a power battery simulation method based on an electric heating and thermal runaway coupling model, and the power battery simulation method comprises the steps: building a geometric optimization model according to a power battery application scene and a simulation calculation need, and determining the geometric size, thermophysical parameters and electrochemical parameters of a power battery; constructing a lithium battery electrochemical equation according to a power battery electrochemical principle, and further constructing a lithium battery electrochemical model; constructing a lithium battery thermal runaway material decomposition heat production equation according to a power battery material thermal decomposition reaction principle so as to construct a thermalrunaway model; constructing a lithium battery heat dissipation equation and a heat transfer equation according to a battery use scene, coupling the electrochemical model and the thermal runaway model,and then completing an electric heating and thermal runaway coupling model; and according to the built electric heating and thermal runaway coupling model, using CFD software programming, setting boundary conditions, carrying out meshing, and carrying out battery thermal characteristic simulation through solving. The method power battery simulation is low in cost, high in simulation precision, wide in application range and capable of reliably researching the temperature characteristics of the lithium ion battery.
Description
technical field [0001] The invention relates to the technical field of battery management systems, in particular to a power battery simulation method based on a coupling model of electrothermal and thermal runaway. Background technique [0002] At present, my country is vigorously developing new energy technologies, and power batteries are the power source and core component of electric vehicles, so the performance research of power batteries is of great significance. Lithium-ion batteries occupy the vast majority of the market due to their advantages such as low cost, high specific energy, good cycle performance and no memory effect. When the power battery is charged quickly at a high discharge rate, it will release a lot of heat. The generation and rapid accumulation of heat will inevitably cause the internal temperature of the battery to rise. If the heat cannot be discharged in time, it may cause local thermal runaway of the battery and heat spread, which will cause the...
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Login to View More IPC IPC(8): G06F30/20G06F111/10G06F119/14
CPCG06F30/20G06F2111/10G06F2119/14
Inventor刘桂雄李伟李远茂
OwnerSOUTH CHINA UNIV OF TECH