CN108062429A - A kind of simulating analysis of Soft Roll type lug structure of lithium-ion power battery - Google Patents
A kind of simulating analysis of Soft Roll type lug structure of lithium-ion power battery Download PDFInfo
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- CN108062429A CN108062429A CN201711072051.5A CN201711072051A CN108062429A CN 108062429 A CN108062429 A CN 108062429A CN 201711072051 A CN201711072051 A CN 201711072051A CN 108062429 A CN108062429 A CN 108062429A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/30—Circuit design
- G06F30/36—Circuit design at the analogue level
- G06F30/367—Design verification, e.g. using simulation, simulation program with integrated circuit emphasis [SPICE], direct methods or relaxation methods
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention discloses a kind of simulating analysis of Soft Roll type lug structure of lithium-ion power battery, including：S1 establishes battery electrochemical model, sets and solves domain relevant information；S2 foundation group cell thermal models set and solve domain relevant information；S3 adds the initial value, boundary condition and subsequent mesh generation of electrochemical model and thermal model respectively；S4 establishes the coupling terms between the battery electrochemical model and thermal model；S5 is based on verifying accurate model, and research is optimized to this battery tab structure.Advantageous effect：Electrochemical model constructed by the present invention calculates in a pair of of battery core unit, and thermal model calculates in the homogeneous threedimensional model not being layered, heat production rate and temperature are coupled into respectively in respective model by corresponding Coupling operator between the two, such processing mode causes model to be greatly improved in calculation amount and accuracy, can provide help to do numerical computations optimization below.
Description
Technical field
The present invention relates to technical field of lithium ion, it particularly relates to which a kind of be based on COMSOL Mulitiphysics
The simulating analysis of study of platform Soft Roll type lug structure of lithium-ion power battery.
Background technology
Lithium ion battery is because monomer operating voltage is high, energy density is high, have extended cycle life, operating temperature range is wide, without dirt
The advantages that dye, becomes the first choice of Prospect of EVS Powered with Batteries.However, vehicle lithium-ion power battery faces in use
Temperature distribution is non-uniform, the excessively high heat problem of local temperature, seriously affects its performance, service life and safety, therefore it is necessary to monomer
Battery carries out thermal design optimization, to improve battery thermal characteristics, reduces the complexity of heat management system.
For the lug that reduced size is used compared with 18650 type battery of takeup type, the extreme ear structure ruler of stacked soft-package battery
Very little larger, in high current charge-discharge, because its internal resistance is big, thermal capacitance is small, and with constant high yield heating rate；Due to lug and battery core
On flange collector weld together, therefore there are sufficient heat exchanges between the two.Therefore, the lug of Stackable batteries removes
It rises outside drainage, also has larger impact to the Temperature Distribution of battery core.According to existing research, the selection for lug position,
Tend to the centre position arrangement of battery core long side offside；Selection for lug size to reduce lug internal resistance, reduces lug production
Heat, it is intended to use thick, wide and short lug.However, the value of lug width and thickness all cannot be too big, it is no it will cause
The junction of lug and battery core is difficult to solder to and encapsulates, and can increase the overall weight of battery；Therefore reasonable design lug
Positions and dimensions, it is particularly significant to the heat distribution of improvement battery.
Using the stacked method for soft package lithium ion power of emulation mode research extreme ear structure problem when, there are following difficulties
Point：Stacked soft-package battery is formed by the same battery core element stack of multi-layer phase, and the scale in every layer of electrode thickness direction is with respect to length and width
The size difference in direction is very big, if directly being modeled according to battery real structure, in subsequent mesh generation and solves in calculating
It is more difficult.Therefore there is an urgent need for develop Rational Simplification simulation model, reduce the calculation amount of numerical solution, it is excellent convenient for the design in later stage
Change.
The problem of in correlation technique, currently no effective solution has been proposed.
The content of the invention
For the above-mentioned technical problem in correlation technique, the present invention proposes a kind of Soft Roll type lithium ion power battery pole ear knot
The simulating analysis of structure using numerical simulation means, can rapidly and accurately calculate different extreme ear structure designs to battery temperature
The influence of distribution, and then realize the thermal design optimization of the lug size of the size battery.
To realize above-mentioned technical purpose, the technical proposal of the invention is realized in this way：
A kind of simulating analysis of Soft Roll type lug structure of lithium-ion power battery, comprises the following steps：
S1 establishes battery electrochemical model, sets the information including physical field, solution domain and material properties, the electricity
Chemical model is stacked by 5 layers of different-thickness electrode plate, is stacked order and is followed successively by positive collector, anode coating, membrane, cathode
Coating and cathode fluid, size are determined according to actual battery design parameter；
S2 establishes cell thermal model, sets the information including physical field, solution domain and material properties, the thermal model
Size determines that the thermal model includes positive and negative extreme ear structure, core strueture and lug and electricity according to actual battery design parameter
The connection structure of core；
S3 adds the initial value of electrochemical model and thermal model, boundary condition respectively, and carries out mesh generation；
S4 establishes the coupling terms between the battery electrochemical model and thermal model；
S5 is based on verifying accurate model, and research is optimized to this battery tab structure.
Preferably, S1 is specifically included：
S11 creates solution domain of the component 1 as electrochemical model in COMSOL, and specific model geometric is by 5 layers of difference
The electrode plate of thickness stacks, and stacks order and is followed successively by positive collector, anode coating, membrane, cathode coating, negative collector,
Depending on size is by real cell design parameters；
The end at the long end of positive and negative collector in the model that S12 is formed in multilayer pole plate stacking is built using parametrization line
Vertical extreme ear structure, using real lug width dimensions, the thickness of lug is set the width of lug using the thickness of collector；
S13 defines each in establishment and solves in domain including material properties and the information including reaction transmission property respectively.
Preferably, S2 is specifically included：
S21 establishes solution domain of the component 2 as the soft-package battery thermal model in COMSOL, specific model geometric according to
Real battery design size is set, and is made of 3 parts, is respectively positive and negative extreme ear structure, core strueture and lug and electricity
The connection structure of core；
S22 lugs and the local geometric of battery core junction are made of the hexahedron close to triangular prism, wherein with lug phase
The face of connection and lug cross section are equal in magnitude, which is material used in positive and negative collector.
Further, initial value, the boundary condition of electrochemical model are added in S3, mesh generation is carried out and specifically includes：
S301 determines the initial SOC of battery electrochemical model：
CS0_pos=1-QHead fills/(MJust·279) (1)
CS0_neg=(QHead fills-QSEI)/(MIt is negative·372) (2)
In formula (1), CS0_pos be the initial lithium-inserting amount of anode, QHead fillsFor the first circle charging capacity of battery, MJustFor anode
The quality of active material, QTheory, justFor the theoretical specific capacity of positive electrode；In formula (2), CS0_neg is the initial lithium-inserting amount of cathode,
QSEIFor the contents of decrement that forms a film, MIt is negativeFor the quality of battery cathode active material, QTheory is bornFor the theoretical specific capacity of negative material；
S302 determines the bound current size of battery electrochemical model：
iapp=I/A1 (3)
A1=tW (4)
In formula (3), (4), iappFor the bound current density of the model battery, I is electric current of the actual battery under 1C multiplying powers
Size, A1For effective contact area in 1 electrochemical model of establishment between lug and collector, t is the thickness of positive collector, W
For the width of lug；
The contact area of the lug of battery electrochemical model and negative collector is arranged to ground state by S303；
S304 uses triangular mesh, scans three kinds of grid, switch grid trellis-types to battery electrochemical model geometric
Carry out mesh generation.
Further, the long side upper end in S34 first in pole plate carries out subdivision with triangular mesh, then to each region
Using mesh generation is scanned, then the grid scanned is converted using switch grid.
Further, initial value, the boundary condition of thermal model are added in S3, mesh generation is carried out and specifically includes：
The initial value of cell thermal model is set to 25 DEG C by S311；
The boundary condition in battery core domain in cell thermal model is set to heat transfer free convection by S312, and the coefficient of heat transfer is 5W/ (m2·
K), lug and the boundary condition of connection structure are set to heat transfer free convection, and the coefficient of heat transfer is 5.5W/ (m2·K)；
S313 using triangle, scan and these three grids of boundary layer to cell thermal model carry out subdivision.
Further, the connection structure of lug and battery core carries out subdivision using body fitted anisotropic mesh in S313.
Further, S4 is specifically included：
S41 establishes battery core heat source coupling terms in electrochemical model, and Coupling operator uses generalized projection, battery core heat production is led to
Cross the three-dimensional thermal model correspondence position that the Coupling operator is mapped into component 2；
S42 calculates the positive and negative lug heat production obtained in thermal model using Ohm's law, corresponding position is given, as the domain
Heat production item：
Qtab=(I/A2)2·Rtab (5)
Rtab=ρ L/ (WT) (6)
In formula (5), (6), QtabFor lug heat production, I is size of current of the actual battery under 1C multiplying powers, A2For the establishment 2
The cross-sectional area of true extreme ear structure, R in thermal modeltabFor the ohmic internal resistance of lug, ρ is the resistivity of lug material, and L is pole
The length of ear, W are lug width, and T is lug thickness；
The Temperature Distribution that cell thermal model is calculated is averaged by S43 along cell thickness direction, passes through scalar averaging operator
It is coupled into the input temp of electrochemical model.
Further, S5 is specifically included：After putting up the thermo-electrically chemical Coupling model of this battery, from including size, position
Multiple angles including putting carry out the thermal design optimizing research of this battery tab structure.
Beneficial effects of the present invention：Electrochemical model constructed by the present invention calculates in a pair of of battery core unit, and hot-die
Type calculates in the homogeneous threedimensional model not being layered, is between the two coupled heat production rate and temperature respectively by corresponding Coupling operator
Into in respective model, such processing mode causes model to be greatly improved in calculation amount and accuracy, for below
It does numerical computations optimization and provides great help.
Description of the drawings
It in order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the present invention
Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is a kind of emulation of the stacked lug structure of lithium-ion power battery of research described according to embodiments of the present invention
The flow chart of analysis method；
Fig. 2 is put for the geometry solving domain of 1 electrochemical model of component in the present invention and the part of extreme ear structure (current boundary)
Big figure；
Fig. 3 is the geometry solving domain of 2 thermal model of component in the present invention, including battery core, lug and the company of lug and battery core
Binding structure；
Fig. 4 is the coupled modes schematic diagram of respective physical amount in 2 thermal model of 1 electrochemical model of component and component；
The comparison diagram for the data that Fig. 5 and Fig. 6 measures for the result of calculation of the simulation model with experiment；
Fig. 7 and Fig. 8 is the hot optimum results that lug position is carried out using the simulation model；
Fig. 9 to Figure 12 is the hot optimum results that lug width and thickness are carried out using the simulation model.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art's all other embodiments obtained belong to what the present invention protected
Scope.
As shown in Figure 1, a kind of Soft Roll type lug structure of lithium-ion power battery according to embodiments of the present invention is imitative
True analysis method, comprises the following steps：
S1 establishes battery electrochemical model, sets the information including physical field, solution domain and material properties, the electricity
Chemical model is stacked by 5 layers of different-thickness electrode plate, is stacked order and is followed successively by positive collector, anode coating, membrane, cathode
Coating and cathode fluid, size are determined according to actual battery design parameter；
S2 establishes cell thermal model, sets the information including physical field, solution domain and material properties, the thermal model
Size determines that the thermal model includes positive and negative extreme ear structure, core strueture and lug and electricity according to actual battery design parameter
The connection structure of core；
S3 adds the initial value of electrochemical model and thermal model, boundary condition respectively, and carries out mesh generation；
S4 establishes the coupling terms between the battery electrochemical model and thermal model；
S5 is based on verifying accurate model, and research is optimized to this battery tab structure.
Preferably, S1 is specifically included：
S11 creates solution domain of the component 1 as electrochemical model in COMSOL, and specific model geometric is by 5 layers of difference
The electrode plate of thickness stacks, and stacks order and is followed successively by positive collector, anode coating, membrane, cathode coating, negative collector,
Depending on size is by real cell design parameters；
The end at the long end of positive and negative collector in the model that S12 is formed in multilayer pole plate stacking is built using parametrization line
Vertical extreme ear structure, using real lug width dimensions, the thickness of lug is set the width of lug using the thickness of collector；
S13 defines each in establishment and solves in domain including material properties and the information including reaction transmission property respectively.
Preferably, S2 is specifically included：
S21 establishes solution domain of the component 2 as the soft-package battery thermal model in COMSOL, specific model geometric according to
Real battery design size is set, and is made of 3 parts, is respectively positive and negative extreme ear structure, core strueture and lug and electricity
The connection structure of core；
S22 lugs and the local geometric of battery core junction are made of the hexahedron close to triangular prism, wherein with lug phase
The face of connection and lug cross section are equal in magnitude, which is material used in positive and negative collector.
Further, initial value, the boundary condition of electrochemical model are added in S3, mesh generation is carried out and specifically includes：
S301 determines the initial SOC of battery electrochemical model：
CS0_pos=1-QHead fills/(MJust·279) (1)
CS0_neg=(QHead fills-QSEI)/(MIt is negative·372) (2)
In formula (1), CS0_pos be the initial lithium-inserting amount of anode, QHead fillsFor the first circle charging capacity of battery, MJustFor anode
The quality of active material, QTheory, justFor the theoretical specific capacity of positive electrode；In formula (2), CS0_neg is the initial lithium-inserting amount of cathode,
QSEIFor the contents of decrement that forms a film, MIt is negativeFor the quality of battery cathode active material, QTheory is bornFor the theoretical specific capacity of negative material；
S302 determines the bound current size of battery electrochemical model：
iapp=I/A1 (3)
A1=tW (4)
In formula (3), (4), iappFor the bound current density of the model battery, I is electric current of the actual battery under 1C multiplying powers
Size, A1For effective contact area in 1 electrochemical model of establishment between lug and collector, t is the thickness of positive collector, W
For the width of lug；
The contact area of the lug of battery electrochemical model and negative collector is arranged to ground state by S303；
S304 uses triangular mesh, scans three kinds of grid, switch grid trellis-types to battery electrochemical model geometric
Carry out mesh generation.
Further, the long side upper end in S34 first in pole plate carries out subdivision with triangular mesh, then to each region
Using mesh generation is scanned, then the grid scanned is converted using switch grid.
Further, initial value, the boundary condition of thermal model are added in S3, mesh generation is carried out and specifically includes：
The initial value of cell thermal model is set to 25 DEG C by S311；
The boundary condition in battery core domain in cell thermal model is set to heat transfer free convection by S312, and the coefficient of heat transfer is 5W/ (m2·
K), lug and the boundary condition of connection structure are set to heat transfer free convection, and the coefficient of heat transfer is 5.5W/ (m2·K)；
S313 using triangle, scan and these three grids of boundary layer to cell thermal model carry out subdivision.
Further, the connection structure of lug and battery core carries out subdivision using body fitted anisotropic mesh in S313.
Further, S4 is specifically included：
S41 establishes battery core heat source coupling terms in electrochemical model, and Coupling operator uses generalized projection, battery core heat production is led to
Cross the three-dimensional thermal model correspondence position that the Coupling operator is mapped into component 2；
S42 calculates the positive and negative lug heat production obtained in thermal model using Ohm's law, corresponding position is given, as the domain
Heat production item：
Qtab=(I/A2)2·Rtab (5)
Rtab=ρ L/ (WT) (6)
In formula (5), (6), QtabFor lug heat production, I is size of current of the actual battery under 1C multiplying powers, A2For the establishment 2
The cross-sectional area of true extreme ear structure, R in thermal modeltabFor the ohmic internal resistance of lug, ρ is the resistivity of lug material, and L is pole
The length of ear, W are lug width, and T is lug thickness；
The Temperature Distribution that cell thermal model is calculated is averaged by S43 along cell thickness direction, passes through scalar averaging operator
It is coupled into the input temp of electrochemical model.
Further, S5 is specifically included：After putting up the thermo-electrically chemical Coupling model of this battery, from including size, position
Multiple angles including putting carry out the thermal design optimizing research of this battery tab structure.
In order to facilitate understand the present invention above-mentioned technical proposal, below by way of in specifically used mode to the present invention it is above-mentioned
Technical solution is described in detail.
When specifically used, a kind of stacked Soft Roll type lithium ion power battery pole ear knot of research according to the present invention
The embodiment of the simulating analysis of structure calculates electrochemical model using battery core cellular construction, and thermal model is in another component
It calculates in real homogeneous three-dimensional geometry, is between the two coupled into heat production rate and temperature each respectively by corresponding Coupling operator
Model in, such processing mode causes model to be greatly improved in calculation amount and accuracy, to do numerical value below
Calculation optimization provides great help.With reference to the accompanying drawings and detailed description, to the present invention and its advantageous effects
It is described in detail, but the present invention is not limited thereto.
As shown in Figure 1, a kind of simulating analysis for studying stacked Soft Roll type lug structure of lithium-ion power battery, it should
Method comprises the steps of：
Step 1 establishes battery electrochemical model, sets physical field, solves the information such as domain, material properties.
Step 1.1 creates solution domain of the component 1 as electrochemical model in COMSOL, and specific model geometric is by 5 layers
The electrode plate of different-thickness stacks, and stacks order and is followed successively by positive collector, anode coating, membrane, cathode coating, negative afflux
Body, depending on size is by real cell design parameters, as shown in Figure 2；
Step 1.2, the end at the long end of positive and negative collector in the model that forms of multilayer pole plate stacking, using parametrization
Line establishes extreme ear structure, and the width of lug is using real lug width dimensions, and the thickness of lug then simplifies to a certain degree,
It is set using the thickness of collector, as shown in the partial enlarged view in Fig. 3；
Step 1.3 defines the information such as material properties and reaction transmission property that each in setting up is solved in domain respectively；
Step 2, the initial value for adding the electrochemical model, boundary condition and subsequent mesh generation.
Step 2.1, the initial SOC for determining model battery；
CS0_pos=1-QHead fills/(MJust·279) (1)
CS0_neg=(QHead fills-QSET)/(MIt is negative·372) (2)
In formula (1), CS0_pos be the initial lithium-inserting amount of anode, QHead fillsFor the first circle charging capacity of battery, MJustFor anode
The quality of active material, QTheory, justFor the theoretical specific capacity of positive electrode；In formula (2), CS0_neg is the initial lithium-inserting amount of cathode,
QSEIFor the contents of decrement that forms a film, MIt is negativeFor the quality of battery cathode active material, QTheory is bornFor the theoretical specific capacity of negative material；
Step 2.2, the bound current size for determining the electrochemical model battery：
iapp=I/A1 (3)
A1=tW (4)
In formula (3), (4), iappFor the bound current density of the model battery, I is electric current of the actual battery under 1C multiplying powers
Size, A1For effective contact area in 1 electrochemical model of establishment between lug and collector, t is the thickness of positive collector, W
For the width of lug；
The contact area of lug and negative collector is arranged to ground state by step 2.3, that is, sets at this potential as 0V；
Step 2.4, using triangular mesh, scan these three trellis-types of grid, switch grid to five layer thickness compared with
Thin model geometric carries out mesh generation, subdivision is carried out with triangular mesh in the long side upper end of pole plate first, then to each
Region since the later stage is related to using generalized projection Coupling operator, therefore is also needed using switch grid pair using mesh generation is scanned
The above-mentioned grid scanned is converted；
Step 3 establishes cell thermal model, sets physical field, solves the information such as domain, material properties.
Step 3.1 establishes solution domain of the component 2 as the soft-package battery thermal model in COMSOL, and specific model is several
What sets according to real battery design size, is made of 3 parts, respectively positive and negative extreme ear structure, core strueture, Yi Jiji
The connection structure of ear and battery core, as shown in Figure 3；
The local geometric of step 3.2, lug and battery core junction is made of the hexahedron close to triangular prism, wherein with pole
The face that ear is connected and lug cross section are equal in magnitude, which is material used in positive and negative collector, in Fig. 2
Shown in local magnification region；
Step 4, initial value, boundary condition and the subsequent mesh generation for adding thermal model；
Step 4.1, the initial value of the thermal model are set to 25 DEG C, all domains suitable for setting up 2；
Step 4.2, the boundary condition in battery core domain are set to heat transfer free convection, and the coefficient of heat transfer is 5W/ (m2·K)；Lug and
The boundary condition of connection structure is set to heat transfer free convection, and the coefficient of heat transfer is 5.5W/ (m2·K)；
Step 4.3, using triangle, scan and these three grids of boundary layer carry out subdivision, wherein pole to 2 geometry of component
The connection structure of ear and battery core is using body fitted anisotropic mesh；
Step 5 establishes coupling terms between the battery electrochemical model and thermal model；
Step 5.1 establishes battery core heat source coupling terms in the component 1, and Coupling operator uses generalized projection, by electrochemical model
Interior battery core heat production is mapped into the three-dimensional thermal model correspondence position of component 2 by this Coupling operator, and specific coupled modes are shown in figure
4；
Positive and negative lug heat production in step 5.2,2 thermal model of component is calculated by Ohm's law to be obtained, and gives correspondence position
Place, the heat production item as the domain：
Qtab=(I/A2)2·Rtab (5)
Rtab=ρ L/ (WT) (6)
In formula (5), (6), QtabFor lug heat production, I is size of current of the actual battery under 1C multiplying powers, A2For the establishment 2
The cross-sectional area of true extreme ear structure, R in thermal modeltabFor the ohmic internal resistance of lug, ρ is the resistivity of lug material, and L is pole
The length of ear, W are lug width, and T is lug thickness；
The Temperature Distribution that the three-dimensional thermal model of step 5.3, component 2 is calculated is averaged along cell thickness direction, passes through scalar
Averaging operator is coupled into the input temp of the electrochemical model of component 1；
Step 6, based on accurate model is verified, this battery tab structure is optimized；
Step 6.1 after putting up the thermo-electrically chemical Coupling model of this battery, can be carried out from size, position angularly
The thermal design optimizing research of this battery tab structure；
If Fig. 5 and Fig. 6 is verification data, Fig. 7 and Fig. 8 are the optimization that extreme ear structure width and thickness are carried out using the model
As a result, it is seen that there are optimal lug width and thickness so that the maximum temperaturerise and maximum temperature difference of battery reach smaller scope.
As it can be seen in figures 5 and 6, Fig. 5 is the comparison of cell discharge voltage and numerical computation that experiment collects, Fig. 6 is
Test the comparison of the battery surface Wen Shengyu numerical computations collected, it can be seen that the method for the model foundation has higher
Precision.
As shown in Fig. 9 to 12, Fig. 9 and the hot optimum results that Figure 10 is lug width；Figure 11 and Figure 12 is lug thickness
Hot optimum results.
In conclusion utilize a kind of emulation for studying stacked Soft Roll type lug structure of lithium-ion power battery point of the present invention
Analysis method can construct the thermo-electrically chemical Coupling model of various sizes soft-package battery, to study this battery relatively simplely
Hot optimization design help is provided.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
With within principle, any modifications, equivalent replacements and improvements are made should all be included in the protection scope of the present invention god.
Claims (9)
1. a kind of simulating analysis of Soft Roll type lug structure of lithium-ion power battery, which is characterized in that comprise the following steps：
S1 establishes battery electrochemical model, sets the information including physical field, solution domain and material properties, the electrochemistry
Model is stacked by 5 layers of different-thickness electrode plate, is stacked order and is followed successively by positive collector, anode coating, membrane, cathode coating
With cathode fluid, size is determined according to actual battery design parameter；
S2 establishes cell thermal model, sets the information including physical field, solution domain and material properties, the hot-die molded dimension
It is determined according to actual battery design parameter, the thermal model includes positive and negative extreme ear structure, core strueture and lug and battery core
Connection structure；
S3 adds the initial value of electrochemical model and thermal model, boundary condition respectively, and carries out mesh generation；
S4 establishes the coupling terms between the battery electrochemical model and thermal model；
S5 is based on verifying accurate model, and research is optimized to this battery tab structure.
2. the simulating analysis of Soft Roll type lug structure of lithium-ion power battery according to claim 1, feature exist
In S1 is specifically included：
S11 creates solution domain of the component 1 as electrochemical model in COMSOL, and specific model geometric is by 5 layers of different-thickness
Electrode plate stack, stack order and be followed successively by positive collector, anode coating, membrane, cathode coating, negative collector, size
Depending on real cell design parameters；
Pole is established in the end at the long end of positive and negative collector in the model that S12 is formed in multilayer pole plate stacking using parametrization line
Ear structure, using real lug width dimensions, the thickness of lug is set the width of lug using the thickness of collector；
S13 defines each in establishment and solves in domain including material properties and the information including reaction transmission property respectively.
3. the simulating analysis of Soft Roll type lug structure of lithium-ion power battery according to claim 1, feature exist
In S2 is specifically included：
S21 establishes solution domain of the component 2 as the soft-package battery thermal model in COMSOL, and specific model geometric is according to true
Battery design size set, be made of 3 parts, be respectively positive and negative extreme ear structure, core strueture and lug and battery core
Connection structure；
S22 lugs and the local geometric of battery core junction are made of the hexahedron close to triangular prism, wherein being connected with lug
Face and lug cross section it is equal in magnitude, the zone material be material used in positive and negative collector.
4. the simulating analysis of Soft Roll type lug structure of lithium-ion power battery according to claim 1, feature exist
In initial value, the boundary condition of addition electrochemical model in S3 carry out mesh generation and specifically include：
S301 determines the initial SOC of battery electrochemical model：
（1）
（2）
Formula（1）In, CS0_pos is the initial lithium-inserting amount of anode,For the first circle charging capacity of battery,For anode
The quality of active material,For the theoretical specific capacity of positive electrode；Formula（2）In, CS0_neg is the initial lithium-inserting amount of cathode,For form a film contents of decrement,For the quality of battery cathode active material,For the theoretical specific volume of negative material
Amount；
S302 determines the bound current size of battery electrochemical model：
（3）
（4）
Formula（3）、（4）In,For the bound current density of the model battery, I is that electric current of the actual battery under 1C multiplying powers is big
It is small,For effective contact area in 1 electrochemical model of establishment between lug and collector, t is the thickness of positive collector, and W is
The width of lug；
The contact area of the lug of battery electrochemical model and negative collector is arranged to ground state by S303；
S304 uses triangular mesh, scans three kinds of grid, switch grid trellis-types to the progress of battery electrochemical model geometric
Mesh generation.
5. the simulating analysis of Soft Roll type lug structure of lithium-ion power battery according to claim 4, feature exist
In the long side upper end in S34 first in pole plate carries out subdivision with triangular mesh, then scans grid to the use of each region and cuts open
Point, then the grid scanned is converted using switch grid.
6. the simulating analysis of Soft Roll type lug structure of lithium-ion power battery according to claim 1, feature exist
In initial value, the boundary condition of addition thermal model in S3 carry out mesh generation and specifically include：
The initial value of cell thermal model is set to 25 DEG C by S311；
The boundary condition in battery core domain in cell thermal model is set to heat transfer free convection by S312, and the coefficient of heat transfer is 5 W/ (m2K),
Lug and the boundary condition of connection structure are set to heat transfer free convection, and the coefficient of heat transfer is 5.5 W/ (m2·K)；
S313 using triangle, scan and these three grids of boundary layer to cell thermal model carry out subdivision.
7. the simulating analysis of Soft Roll type lug structure of lithium-ion power battery according to claim 6, feature exist
In the connection structure of lug and battery core carries out subdivision using body fitted anisotropic mesh in S313.
8. the simulating analysis of Soft Roll type lug structure of lithium-ion power battery according to claim 1, feature exist
In S4 is specifically included：
S41 establishes battery core heat source coupling terms in electrochemical model, and Coupling operator uses generalized projection, battery core heat production is passed through
The Coupling operator is mapped into the three-dimensional thermal model correspondence position of component 2；
S42 calculates the positive and negative lug heat production obtained in thermal model using Ohm's law, gives corresponding position, the production as the domain
Hot-activity：
（5）
（6）
Formula（5）、（6）In,For lug heat production, I is size of current of the actual battery under 1C multiplying powers,For 2 heat of establishment
The cross-sectional area of true extreme ear structure in model,For the ohmic internal resistance of lug, ρ is the resistivity of lug material, and L is lug
Length, W be lug width, T be lug thickness；
The Temperature Distribution that cell thermal model is calculated is averaged by S43 along cell thickness direction, is coupled by scalar averaging operator
Into the input temp of electrochemical model.
9. the simulating analysis of Soft Roll type lug structure of lithium-ion power battery according to claim 1, feature exist
In S5 is specifically included：After putting up the thermo-electrically chemical Coupling model of this battery, from the multiple angle including size, position
Degree carries out the thermal design optimizing research of this battery tab structure.
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