CN114707184A - Power battery thermal management and thermal spread inhibition method based on lumped model - Google Patents

Power battery thermal management and thermal spread inhibition method based on lumped model Download PDF

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CN114707184A
CN114707184A CN202210238421.2A CN202210238421A CN114707184A CN 114707184 A CN114707184 A CN 114707184A CN 202210238421 A CN202210238421 A CN 202210238421A CN 114707184 A CN114707184 A CN 114707184A
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崔纳新
周剑文
李长龙
王春雨
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Shandong University
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Abstract

The disclosure belongs to the technical field of battery management, and provides a thermal management and thermal spreading inhibition method for a power battery based on a lumped model, which comprises the following steps: constructing a thermal management geometric structure of the power battery based on the small liquid-cooled micro-channel and the phase-change material; obtaining physical parameters of the thermal management geometric structure, and establishing a single battery heat generation model; constructing a lumped model of the power battery according to the heat generation model and the physical property parameters of the plurality of single batteries in combination with the equivalent circuit; and adding a thermal runaway spread inhibition management module into the lumped model, predicting the temperature change of the power battery based on the lumped model, determining the thermal runaway condition of the power battery, starting the liquid cooling small micro-channel before reaching the thermal runaway trigger condition of the power battery, inhibiting the thermal runaway spread and realizing the thermal management of the power battery.

Description

Power battery thermal management and thermal spread inhibition method based on lumped model
Technical Field
The disclosure belongs to the technical field of battery management, and particularly relates to a thermal management and thermal spread inhibition method for a power battery based on a lumped model.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
Lithium ion batteries are generally used as power sources for electric vehicles due to their advantages of high energy and power density, no memory effect, and long cycle life. However, the safety of the power battery is the first problem to be considered and solved in the development process of the electric automobile, and the energy density of the battery is continuously improved. The thermal runaway accident of the battery of the electric automobile happens occasionally, and the large-scale application of the electric automobile is limited, so that research on the aspect of thermal management of the power battery needs to be carried out.
The battery pack of the electric automobile needs to use a real-time heat management method to ensure and predict safe use of the battery, the current heat management method of the battery pack under normal working conditions at normal temperature is relatively perfect, and the method comprises heat management modes such as air cooling, liquid cooling and phase change materials and a method combining multiple heat management modes.
According to the knowledge of the inventor, at present, an unreasonable problem exists in the thermal management structure for inhibiting the thermal runaway propagation, and if the heat dissipation direction is consistent with the thermal runaway propagation direction, the thermal runaway propagation may even be aggravated; in addition, most of the existing thermal runaway spreading models added into the thermal management system are finite element models, so that the calculation speed is low and the model is difficult to apply to a real vehicle; the existing model for rapidly predicting the thermal runaway propagation does not add a thermal management system, the existing model for rapidly predicting the thermal runaway propagation can rapidly predict the propagation condition of the battery after the thermal runaway by using a heat transfer function based on an equivalent heat transfer experiment, and a circuit model is established based on thermal resistance to rapidly predict the thermal runaway, so that the thermal runaway propagation condition cannot be organically combined, and the model is lack of rapid prediction of the thermal runaway propagation condition under the inhibition of the thermal management system.
Disclosure of Invention
In order to solve the problems, the disclosure provides a thermal management and thermal spread inhibition method for a power battery based on a lumped model, a structure based on the combination of a phase-change material and a small liquid-cooled micro-channel is used as a thermal management system to inhibit the spread of thermal runaway, the possible spread direction of the thermal runaway is fully considered, the flow direction of the liquid-cooled micro-channel is a vertical direction, the possibility of aggravating the spread of the thermal runaway does not exist, and the thermal runaway inhibition speed is high and the effect is good.
According to some embodiments, the scheme of the disclosure provides a thermal management and thermal spreading inhibition method for a power battery based on a lumped model, and the following technical scheme is adopted:
a thermal management and thermal spreading inhibition method for a power battery based on a lumped model comprises the following steps:
constructing a thermal management geometric structure of the power battery based on the liquid cooling small micro-channel and the phase change material;
physical property parameters of the thermal management geometric structure are obtained, and a single battery heat generation model is established;
constructing a lumped model of the power battery according to the plurality of single battery heat production models;
and adding a thermal runaway spread inhibition management module into the lumped model, predicting the temperature change of the power battery based on the lumped model, determining the thermal runaway condition of the power battery, starting the liquid cooling small micro-channel before reaching the thermal runaway trigger condition of the power battery, inhibiting the thermal runaway spread and realizing the thermal management of the power battery.
As a further technical limitation, in the process of constructing the thermal management geometric structure of the power battery, the phase change material is wrapped around each single battery, and the small liquid-cooled microchannels are arranged in the vertical direction of the single batteries.
Further, when the single battery works normally, the heat management geometric structure adopts the phase-change material to dissipate heat; when the single battery enters a thermal runaway state, the thermal management geometric structure restarts the liquid cooling small micro-channel to dissipate heat, so that the thermal runaway spreading of the single battery is restrained.
As a further technical limitation, the cell heat generation model includes the heat generation amount of the cell in normal operation and the heat generation amount of the cell in thermal runaway.
As a further technical limitation, the physical parameters of the thermal management geometry include heat capacity of the single battery, thermal resistance of the single battery, thermal contact resistance between the single batteries, heat capacity of the thermal management material, thermal contact resistance between the single battery and the thermal management material, convective thermal resistance of the single battery, and convective thermal resistance of the thermal management material.
Further, in the process of constructing the lumped model of the power battery, a lumped thermal resistance network of the power battery is established based on the established heat generation model of the single battery and the physical property parameters, and the lumped thermal resistance model of the power battery is established by combining the equivalent circuit.
Specifically, after the lumped thermal resistance network is established, the heat transfer characteristics of the battery, such as the heat capacity of the single battery, the conduction thermal resistance inside the single battery, the contact thermal resistance between the single batteries and the like, are obtained. Expressing the obtained lumped thermal resistance network by using an equivalent circuit, and expressing the heat generation model of the single battery by using the output of an equivalent current source; the heat capacity of the single battery is represented by equivalent capacitance; and (3) expressing the conduction thermal resistance in the battery, the contact thermal resistance between the batteries and the like by using equivalent resistance, and finally constructing an equivalent circuit by using MATLAB Simulink.
Furthermore, the lumped thermal resistance network of the power battery comprises a battery thermal resistance network for normal operation of the power battery and a power battery thermal resistance network containing small micro-channels.
Further, the lumped model is represented by an equivalent circuit composed of an equivalent current source, an equivalent resistance and an equivalent capacitance; wherein an output of the equivalent current source represents the cell heat generation model; the equivalent capacitance represents the heat capacity of the single battery; the equivalent resistance represents a thermal resistance.
As a further technical limitation, the management module for inhibiting the thermal runaway propagation comprises a phase change material module and a liquid cooling module; the phase change material around the unit cell as a whole undergoes a phase change from a solid state to a liquid state when the phase change material is heated to a melting temperature.
Specifically, the heat management module consists of a phase-change material module and a liquid cooling module, and when the single battery works normally, the heat management only operates the phase-change material model, namely only the phase-change material dissipates heat; when the single battery enters a thermal runaway state, the liquid cooling module is started through thermal management, the phase change material model and the liquid cooling module run simultaneously, and the liquid cooling and the phase change material dissipate heat together to inhibit thermal runaway spreading of the power battery; the method for adding the thermal management module into the equivalent circuit model comprises the following steps that for the phase-change material module, the phase-change material around one battery is regarded as a whole, and simultaneously, the phase-change material can generate phase change from a solid state to a liquid state when being heated to a melting temperature, so the heat capacity of the phase-change material around one battery is represented by a variable capacitor, and the contact thermal resistance between the battery and the thermal management material is represented by a resistor; for the liquid cooling module, in order to enable the model to simulate the effect of liquid cooling flow, liquid of one small micro-channel is divided into two parts, the heat capacity of the whole small micro-channel is represented by two capacitors, and the heat dissipation circulation is realized through the on-off control of a circuit, so that the simulation of liquid cooling is realized.
As a further technical limitation, when a thermal runaway condition of the power battery is determined, when the temperature of the power battery exceeds a thermal runaway temperature preset value or the temperature rise rate of the power battery exceeds a thermal runaway temperature rise rate preset value, the thermal runaway of the power battery occurs.
Compared with the prior art, this disclosed beneficial effect does:
the liquid cooling flow direction is vertical, the possibility of aggravating thermal runaway spreading does not exist, and the effect of quickly suppressing the thermal runaway is good. .
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure and are not to limit the disclosure.
FIG. 1 is a flow chart of a lumped model based power battery thermal management and thermal spread suppression method in an embodiment of the disclosure;
FIG. 2 is a structural schematic diagram of a thermal management geometry of a power cell in an embodiment of the present disclosure;
FIG. 3 is another structural schematic of a thermal management geometry of a power cell in an embodiment of the present disclosure;
FIG. 4 is a schematic diagram of a thermal resistance network structure of a power cell in an embodiment of the present disclosure;
FIG. 5 is a schematic diagram of a thermal resistance network of small microchannels in an embodiment of the disclosure;
FIG. 6 is an equivalent circuit diagram of a lumped model in an embodiment of the disclosure;
FIG. 7 is a schematic representation of a simulation of a small microchannel in an embodiment of the disclosure;
fig. 8(a) is a schematic diagram of temperature change of a thermal runaway trigger battery in an embodiment of the disclosure;
fig. 8(b) is a schematic diagram of temperature variation of adjacent cells in an embodiment of the present disclosure;
FIG. 9 is a graphical comparison of calculated time for a model in an embodiment of the disclosure;
fig. 10 is a schematic diagram of temperature changes of the thermal runaway trigger cell (cell-1) and the adjacent cell (cell-2) in an embodiment of the disclosure;
FIG. 11 is a schematic diagram of temperature changes of a thermal runaway trigger cell and adjacent cells with no liquid cooling in an embodiment of the disclosure;
fig. 12 is a schematic diagram of temperature changes for multiple batteries simultaneously triggering thermal runaway in an embodiment of the disclosure;
the battery comprises a battery 1, a battery 2, a battery 3, a battery 4, a battery 5, a battery 6, a battery 7, a battery 8, a battery 9, a battery 10, a battery 11, a battery 12, a battery 13, a battery 14, a phase change material 15, a liquid cooling channel 16, a cooling liquid inlet 17, a cooling liquid outlet 18, a cooling liquid heat capacity 19, a circuit switch 20, thermal contact resistance with the battery 21 and thermal contact resistance with the outside.
Detailed Description
The present disclosure is further described with reference to the following drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present disclosure. As used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The embodiments and features of the embodiments in the present disclosure may be combined with each other without conflict.
The embodiment of the disclosure introduces a thermal management and thermal spread suppression method for a power battery based on a lumped model.
Fig. 1 shows a lumped model-based power battery thermal management and thermal spread suppression method, which includes the following steps:
constructing a thermal management geometric structure of the power battery based on the small liquid-cooled micro-channel and the phase-change material;
physical property parameters of the thermal management geometric structure are obtained, and a single battery heat generation model is established;
constructing a lumped model of the power battery according to the plurality of single battery heat production models;
and adding a thermal runaway spread inhibition management module into the lumped model, predicting the temperature change of the power battery based on the lumped model, determining a thermal runaway condition of the power battery, starting the liquid cooling small microchannel before reaching the thermal runaway trigger condition of the power battery, inhibiting thermal runaway spread and realizing thermal management of the power battery.
As one or more embodiments, the heat management geometry is composed of small liquid-cooled microchannels and phase-change materials, the phase-change materials are paraffin wax as fillers, the phase-change materials wrapped around each battery around the battery are 20g, the small liquid-cooled microchannels are arranged along the vertical direction of the battery, the microchannels are made of aluminum shells, water is used as cooling liquid, the total flow around each battery is 10L/min, and as shown in the heat management geometry shown in fig. 2 and 3, the battery pack is composed of 12 batteries; when the battery enters a thermal runaway state, the system starts the liquid cooling module to inhibit the spread of the thermal runaway of the battery.
The design of the small liquid cooling micro-channel is characterized in that the small liquid cooling micro-channel is composed of a plurality of small liquid cooling channels, 12 channels are distributed on two sides of the wide surface of each battery, the distribution mode is that 6 channels are uniformly distributed on two sides of each battery along the wide surface direction, and the flow direction of the liquid cooling is vertical.
As one or more embodiments, a heat transfer relationship is established according to the connection mode between the battery and the thermal management system, and thermal parameters of the lumped model are determined according to the heat transfer relationship, wherein the thermal parameters comprise heat capacity of the battery, thermal resistance inside the battery, contact thermal resistance between the batteries, heat capacity of the thermal management material, contact thermal resistance between the battery and the thermal management material, convective thermal resistance of the battery, and convective thermal resistance of the thermal management material.
The heat capacity of the battery is determined by the mass and specific heat capacity of the battery, the internal thermal resistance of the battery is determined by the axial thermal conductivity of the battery, the radial thermal conductivity of the battery and the geometric dimension of the battery, the heat capacity of the thermal management material is determined by the mass and specific heat capacity of the thermal management material, the conduction thermal resistance between the batteries is determined by the thermal conductivity and the contact area between the batteries, the conduction thermal resistance between the batteries and the thermal management material is determined by the thermal conductivity and the contact area between the batteries and the thermal management material, the convection thermal resistance of the batteries is determined by the thermal conductivity and the contact area between the batteries and air, and the convection thermal resistance of the thermal management material is determined by the thermal conductivity and the contact area between the thermal management material and the air.
The heat capacity calculation formula of the battery is as follows:
C＝ρVCp
where ρ represents the cell density, CpRepresents the specific heat capacity of the battery, and V represents the volume of the battery.
The calculation formula of the thermal resistance inside the battery is as follows:
Figure BDA0003540738350000091
wherein, deltax,y,zDenotes the thickness in the x, y, z direction, λ, inside the cellx,y,zRepresenting the thermal conductivity in the x, y, z directions inside the cell.
The calculation formula of the conduction thermal resistance between batteries and between the batteries and the thermal management material is as follows:
Figure BDA0003540738350000092
wherein h iscThe convective heat transfer coefficient between the cells and the thermal management material is expressed, and a represents the contact area between the cells and the thermal management material.
The calculation formula of the convective thermal resistance of the battery is as follows:
Figure BDA0003540738350000093
wherein h iscovIs the convective heat transfer coefficient between the battery surface and the environment, AcovRepresenting the contact area between the cell surface and the environment.
In one or more embodiments, the heat generation power of the single battery is composed of the heat generation quantity when the battery normally operates and the heat generation quantity when the battery is in thermal runaway.
The heat production rate of the battery in normal operation is determined by a Bernardi formula, and the expression is as follows:
Figure BDA0003540738350000101
wherein I is current, U is battery terminal voltage, U isocIs the open circuit voltage of the battery, V is the battery volume, dUocand/dT is the entropy thermal coefficient of the battery, and T represents the thermodynamic temperature.
The heat generation quantity during the thermal runaway of the battery is measured through a single battery thermal insulation thermal runaway experiment, and under an insulation test environment, the heat generated by the battery is completely absorbed by the battery and causes temperature rise of delta T. Heat capacity MC of batterypUnder the known condition, the thermal runaway heat generation quantity delta H ═ MC under the adiabatic environment can be accurately obtainedpAnd delta T. And fitting an adiabatic thermal runaway model according to the heat generation quantity measured by the experiment and various chemical components of the battery.
The heat generation power of chemical reactions of various materials inside the battery can be expressed by a uniform formula, that is, the heat generation power of the chemical reactions of various materials inside the battery can be expressed by the uniform formula
Figure BDA0003540738350000102
Wherein Q isx(t) represents the reaction heat generation power of each battery component x, and the subscript x may be SEI, anode, electrolyte, cathode, etc.; c. Cx(t) represents the normalized concentration of the reactants. Delta HxIs the enthalpy of formation of the chemical reaction of the reactant x, i.e. the total heat evolved after complete reaction of the reactant.
The heat generated by internal short circuit during thermal runaway is
Figure BDA0003540738350000103
Wherein, Δ HeRepresents the total electric energy of the battery when the internal short circuit occurs; Δ t represents the average time of electric power release, and in the adiabatic thermal runaway model, Δ t is set to 10 seconds。
The heat generation during thermal runaway of the single battery is:
Q(t)＝Qe(t)+Qx(t)
as one or more embodiments, establishing a battery lumped thermal resistance parameter network; a lumped thermal resistance network is established based on the heat transfer relationship between the battery and the thermal management system.
(1) Battery thermal resistance network in normal operation
The thermal resistance network of the power battery is shown in figure 4, and transfers heat between the adjacent batteries, the external environment and the phase-change material module through thermal resistance. The phase change material surrounding a battery is also considered as a whole, represented by a temperature node, which transfers heat to and from the battery and the external environment through thermal resistance. And wherein TcRepresents the temperature of the central cell; t isneighIndicates the temperature of the adjacent cell; rcRepresents the contact resistance between the batteries; rhRepresenting the convective resistance between the cell surface and the surrounding environment; rx、Ry、RzRepresents the conductive resistance in the x, y and z directions between the cell portion and the cell surface, respectively; rPCMRepresenting the conduction resistance inside the phase change material.
The energy balance equation at the battery node according to the thermal resistance network is as follows
Figure BDA0003540738350000111
Wherein Q represents the heat generation rate at the time of thermal runaway of the battery. McAnd Cp,cellRespectively representing the mass and specific heat capacity of the battery.
(2) Battery thermal resistance network incorporating small microchannels
Taking a small microchannel as an example, the structure of the thermal resistance network of the small microchannel is shown in fig. 5, and the small microchannel is taken as a whole and is represented by a temperature node, so that heat is transferred between adjacent batteries through thermal resistance.
The energy balance equation for the small microchannel is as follows:
Figure BDA0003540738350000121
wherein, TLRepresents the temperature of the small microchannel; r isLRepresenting the contact resistance of the cell with the small microchannel.
Building lumped model according to built battery lumped thermal resistance network
The model is represented by an equivalent circuit, and the equivalent current source, the equivalent thermal resistance and the equivalent capacitance are formed as shown in fig. 6, in the model, the heat generation power of the battery is represented by the output of the current source, the heat capacity of the battery is represented by the capacitance, the conduction thermal resistance between the battery and the battery is represented by the resistance, and the convection thermal resistance between the battery and the air is represented by the resistance.
And adding a thermal management module on the basis of a battery lumped thermal resistance parameter model. In the model, because the phase change material can generate phase change from a solid state to a liquid state when being heated to a melting temperature, the heat capacity is represented by a variable capacitor, and the heat resistance of the battery and the heat management material is represented by a resistor; for the liquid cooling module, in order to make the model simulate the effect of liquid cooling flow, the liquid of one small micro-channel is divided into two parts, the heat capacity of the whole small micro-channel is represented by two capacitors, and the heat dissipation circulation is realized through the switch control of a circuit, so that the simulation of liquid cooling is realized, as shown in fig. 7.
And starting the model, judging whether the battery reaches a thermal runaway condition, if so, starting the liquid cooling module for inhibiting the thermal runaway, observing the spreading condition of the thermal runaway, and calculating when the battery falls to a safe temperature.
When the battery reaches the thermal runaway condition, the power battery is considered to be in thermal runaway when the temperature of the power battery exceeds 150 ℃ or the temperature rise rate dT/dT exceeds 1 ℃/s.
In order to verify the accuracy of the thermal resistance model, a COMSOL is used for establishing a thermal management model for three-dimensionally inhibiting the thermal runaway propagation, the thermal runaway of the battery is triggered by needling, the thermal management model is composed of small liquid-cooled micro-channels and phase-change materials, the phase-change materials are wrapped around the battery, and the small liquid-cooled micro-channels are arranged in the vertical direction of the battery; the lumped thermal resistance model is adopted to establish the same thermal management model for inhibiting the thermal runaway propagation, and the results of the thermal runaway propagation inhibition of the two models are compared. Fig. 8(a) and 8(b) show the temperature changes of the thermal runaway trigger cell and the adjacent cell, respectively, and it can be seen that the thermal management system suppresses the propagation of thermal runaway while the results of the two models are very close, demonstrating the reliability of the lumped model.
By comparing the computation time of the COMSOL three-dimensional model and the lumped thermal resistance model, as shown in FIG. 9, it can be seen that the computation speed of the lumped thermal resistance network method of the invention is significantly faster than that of the COMSOL model, which greatly improves the prediction efficiency of the thermal runaway process.
The specific operation of the thermal management system is demonstrated, firstly, when the battery normally works, if the temperature of one battery (battery-1) is suddenly increased due to needling, the system starts to predict the temperature of each battery of the battery at the moment, the simulation result shows that after thermal runaway of the battery (battery-1) occurs, heat gradually spreads to adjacent batteries, and thermal runaway of the adjacent batteries is already caused at 410s, as shown in fig. 10, the schematic diagram of the temperature change of the thermal runaway trigger battery (battery-1) and the adjacent battery (battery-2) is shown. At this time, the system judges that the battery is about to reach the thermal runaway condition, and immediately starts a thermal management system for restraining the thermal runaway.
After the thermal management system for inhibiting the thermal runaway is started, the liquid cooling small microchannel module also starts to work, at the moment, the system starts to predict the temperature of each battery according to the current cooling condition, the temperature change of a thermal runaway trigger battery (battery-1) and a battery (battery-2) adjacent to the thermal runaway trigger battery is observed, as shown in fig. 11, the maximum temperature of the adjacent batteries is predicted to be 83 ℃, the thermal runaway trigger battery is reduced to be below 100 ℃ after 700 seconds, and the thermal runaway spread is well inhibited.
Even if the situation that a plurality of batteries trigger thermal runaway simultaneously occurs, the extreme situation can be well restrained by combining the phase change material and the liquid cooling in the model. Two batteries (batteries-1 and 7) are set to trigger thermal runaway, temperature changes of the thermal runaway trigger battery (battery-1) and adjacent batteries (batteries-2, 3 and 4) of the thermal runaway trigger battery are observed, as shown in fig. 12, the adjacent batteries do not trigger thermal runaway, and the thermal runaway trigger battery is reduced to be below 100 ℃ after 900 seconds, so that the good effect of the thermal management system in inhibiting the thermal runaway propagation is proved.
The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure, and various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.

Claims (10)

1. A thermal management and thermal spreading inhibition method for a power battery based on a lumped model is characterized by comprising the following steps:
constructing a thermal management geometric structure of the power battery based on the small liquid-cooled micro-channel and the phase-change material;
obtaining physical parameters of the thermal management geometric structure, and constructing a lumped model of the power battery;
and adding a thermal runaway spread inhibition management module into the lumped model, predicting the temperature change of the power battery based on the lumped model, determining the thermal runaway condition of the power battery, starting the liquid cooling small micro-channel before reaching the thermal runaway trigger condition of the power battery, inhibiting the thermal runaway spread and realizing the thermal management of the power battery.
2. The lumped-model-based power battery thermal management and thermal spread suppression method as claimed in claim 1, wherein in the process of constructing the thermal management geometry of the power battery, the phase change material is wrapped around each single battery cell, and the liquid-cooled small micro-channels are arranged in the vertical direction of the single battery cell.
3. The lumped-model-based power battery thermal management and thermal spread suppression method as claimed in claim 2, wherein when a single battery works normally, the thermal management geometry structure adopts the phase change material to dissipate heat; when the single battery enters a thermal runaway state, the thermal management geometric structure restarts the liquid cooling small micro-channel to dissipate heat, so that the thermal runaway spreading of the single battery is restrained.
4. The lumped-model-based power battery thermal management and thermal spread suppression method as claimed in claim 1, wherein the single battery heat generation model comprises a heat generation amount of a single battery in normal operation and a heat generation amount of the single battery in thermal runaway.
5. The lumped model-based power battery thermal management and thermal spread suppression method as claimed in claim 1, wherein the physical parameters of the thermal management geometry include thermal capacity of the single battery, thermal resistance of the single battery, thermal contact resistance between the single batteries, thermal capacity of the thermal management material, thermal contact resistance between the single battery and the thermal management material, convective thermal resistance of the single battery, and convective thermal resistance of the thermal management material.
6. The method for thermal management and thermal spread suppression of the power battery based on the lumped model as claimed in claim 5, wherein in the process of constructing the lumped model of the power battery, the lumped thermal resistance network of the power battery is established based on the established heat generation model and the physical parameters of the single battery, and the lumped thermal resistance model of the power battery is established by combining the equivalent circuit.
7. The lumped-model-based power battery thermal management and thermal spread suppression method as claimed in claim 6, wherein the lumped thermal resistance network of the power battery comprises a battery thermal resistance network for normal operation of the power battery and a power battery thermal resistance network containing small micro-channels.
8. The method for power battery thermal management and thermal spread suppression based on the lumped model as recited in claim 7, wherein the lumped model is represented by an equivalent circuit consisting of an equivalent current source, an equivalent resistance and an equivalent capacitance; wherein an output of the equivalent current source represents the cell heat generation model; the equivalent capacitance represents the heat capacity of the single battery; the equivalent resistance represents a thermal resistance.
9. The lumped-model-based power battery thermal management and thermal spread suppression method as claimed in claim 8, wherein the thermal runaway spread suppression management module comprises a phase change material module and a liquid cooling module; the phase change material around the unit cell as a whole undergoes a phase change from a solid state to a liquid state when the phase change material is heated to a melting temperature.
10. The lumped model-based power battery thermal management and thermal spread suppression method as claimed in claim 1, wherein when a thermal runaway condition of the power battery is determined, the thermal runaway of the power battery occurs when the temperature of the power battery exceeds a thermal runaway temperature preset value or the temperature rise rate of the power battery exceeds a thermal runaway temperature rise rate preset value.
CN202210238421.2A 2022-03-10 2022-03-10 Power battery thermal management and thermal spread inhibition method based on lumped model Pending CN114707184A (en)

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