CN117134030A - Battery pack gradient thermal management device and simulation method - Google Patents
Battery pack gradient thermal management device and simulation method Download PDFInfo
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- 238000004088 simulation Methods 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000012782 phase change material Substances 0.000 claims abstract description 52
- 239000002131 composite material Substances 0.000 claims abstract description 43
- 238000001816 cooling Methods 0.000 claims abstract description 42
- 239000007788 liquid Substances 0.000 claims abstract description 38
- 239000012188 paraffin wax Substances 0.000 claims abstract description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 25
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 20
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 20
- 239000010439 graphite Substances 0.000 claims abstract description 20
- 238000002844 melting Methods 0.000 claims abstract description 18
- 230000008018 melting Effects 0.000 claims abstract description 18
- 238000005457 optimization Methods 0.000 claims abstract description 8
- 230000008859 change Effects 0.000 claims description 18
- 238000007599 discharging Methods 0.000 claims description 6
- 238000002474 experimental method Methods 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- 238000009826 distribution Methods 0.000 claims description 4
- 238000004422 calculation algorithm Methods 0.000 claims description 3
- 238000004364 calculation method Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 230000002194 synthesizing effect Effects 0.000 claims description 3
- 230000007704 transition Effects 0.000 claims description 3
- 230000003247 decreasing effect Effects 0.000 claims 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 241000270295 Serpentes Species 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000012744 reinforcing agent Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Classifications
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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
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/613—Cooling or keeping cold
-
- 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
-
- 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
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/617—Types of temperature control for achieving uniformity or desired distribution of temperature
-
- 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
- H01M10/60—Heating or cooling; Temperature control
- H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
- H01M10/625—Vehicles
-
- 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
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/655—Solid structures for heat exchange or heat conduction
- H01M10/6554—Rods or plates
-
- 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
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
- H01M10/6567—Liquids
- H01M10/6568—Liquids characterised by flow circuits, e.g. loops, located externally to the cells or cell casings
-
- 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
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/659—Means for temperature control structurally associated with the cells by heat storage or buffering, e.g. heat capacity or liquid-solid phase changes or transition
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/08—Thermal analysis or thermal optimisation
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
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Abstract
The application discloses a battery pack gradient heat management device and a simulation method, comprising a liquid cooling plate and a battery pack, wherein one end of the liquid cooling plate is provided with a water inlet, and the other end of the liquid cooling plate is provided with a water outlet; the battery packs are distributed on two sides of the liquid cooling plate, and the battery packs are partitioned according to the temperature of the battery packs in the use state; the gap between the battery pack and the liquid cooling plate is filled with a composite phase change material layer, the composite phase change material layer is coupled with the liquid cooling plate to control the temperature of the battery pack, the composite phase change material layer comprises expanded graphite and paraffin, and the melting points of the paraffin around the battery pack in different areas or the addition amount of the expanded graphite are different so as to perform gradient thermal management on the battery pack; the application carries out gradient optimization design on the composite phase change materials in different geometric intervals in the battery thermal management system, thereby efficiently balancing the temperature difference between the battery packs and improving the use safety performance of the battery packs.
Description
Technical Field
The application relates to the technical field of thermal management of power batteries of new energy automobiles, in particular to a battery pack gradient thermal management device and a simulation method.
Background
Along with the aggravation of environmental pollution, the new energy automobile is popularized rapidly, the power core of the new energy automobile is a lithium ion battery, the lithium ion battery can emit a large amount of heat in the rapid charge and discharge process, if the heat is not effectively dissipated, the capacity of the battery is rapidly attenuated, the battery is spontaneously ignited under serious conditions, the use safety performance of the new energy automobile is seriously affected, and in order to improve the safety and the service life of the battery, the battery is required to be thermally managed, firstly, the highest temperature of the battery is controlled, the battery is enabled to run at 25-50 ℃ in a safe range, secondly, the temperature difference between battery packs is balanced, the temperature difference between single batteries is not more than 5 ℃, and the safety and the service life of the battery packs are improved.
At present, a liquid cooling mode is mainly adopted for heat management of a battery, and although liquid cooling has the advantage of high cooling efficiency, liquid cooling equipment is complex, cooling temperature is uneven, and extra energy sources can be consumed.
In addition, aiming at the battery equalization temperature control research, the flow direction and the structure of the liquid cooling pipeline are mainly improved structurally at present, for example, the direct cooling pipeline is changed into an S shape or a snake shape, the manufacturing difficulty of equipment is increased by the improvement of the structure, and on the other hand, the liquid cooling flow speed and the cooling efficiency are reduced due to the roundabout of the pipeline.
Disclosure of Invention
In order to solve the problems, the embodiment of the application provides a battery pack gradient heat management device and a simulation method, wherein the battery pack is subjected to temperature control treatment by a technology of coupling composite phase change materials and liquid cooling, and gradient temperature control is realized by optimizing phase change points or heat conduction coefficients of the phase change materials in different sections, and the technical scheme is as follows:
the application provides a battery pack gradient heat management device, which comprises a liquid cooling plate and a battery pack, wherein one end of the liquid cooling plate is provided with a water inlet, and the other end of the liquid cooling plate is provided with a water outlet; the battery packs are distributed on two sides of the liquid cooling plate, and the battery packs are partitioned according to the temperature of the battery packs in the use state; the gap between the battery pack and the liquid cooling plate is filled with a composite phase change material layer, the composite phase change material layer is coupled with the liquid cooling plate to control the temperature of the battery pack, the composite phase change material layer comprises expanded graphite and paraffin, and the melting points of the paraffin around the battery pack in different areas or the addition amount of the expanded graphite are different so as to carry out gradient thermal management on the battery pack.
For example, in the gradient thermal management device for battery packs provided in one embodiment, the melting points of paraffin corresponding to the periphery of the battery packs in different areas decrease in order of increasing the temperatures of the battery packs in different areas, so as to control the temperatures and the temperature differences of the battery packs in different areas.
For example, in the gradient thermal management device for battery packs provided in one embodiment, the addition amounts of the corresponding expanded graphite around the battery packs in different areas are sequentially increased in order of increasing the use state temperatures of the battery packs in different areas, so as to control the temperatures and the temperature differences of the battery packs in different areas.
For example, in one embodiment, a gradient thermal management device for a battery pack is provided, wherein the mass ratio of the expanded graphite to the paraffin wax is: 3: 7-1: 10.
for example, in one embodiment provides a battery pack gradient thermal management device, the paraffin wax has an initial phase transition point temperature of 38 ℃ to 46 ℃.
For example, in the gradient thermal management device for a battery pack provided in one embodiment, the liquid cooling plate is a direct-current liquid cooling plate.
For example, in the gradient thermal management device for a battery pack provided in one embodiment, the battery packs are arranged in a double-row serial manner, and the two rows of battery packs are respectively placed at two sides of the liquid cooling plate and are partitioned along a direction from the water inlet to the water outlet.
The second aspect of the application provides a battery pack gradient thermal management simulation method, which comprises the following steps:
s1, carrying out different charge and discharge experiments on the battery according to the selected single battery to obtain the change relation of the temperature of the battery with time under different multiplying powers;
s2, fitting the heating power of the battery by using a polynomial according to a charging and discharging experimental result, calculating the heating power of the battery under the constant-current discharging condition, and using the polynomial for inputting heat source parameters in a simulation model;
s3, establishing a geometric model of the battery thermal management system, and setting model material parameters;
s4, simulating calculation, analyzing a temperature and temperature difference distribution rule of the battery pack according to a calculated and analyzed cloud chart, and dividing the battery pack into areas according to cloud chart gradients;
s5, optimizing the phase change point temperature or the heat conductivity coefficient of the composite phase change material in different areas by taking the highest temperature of the battery as 50 ℃ and the lowest temperature difference as an optimization target;
s6, obtaining optimal gradient parameters by using an intelligent optimization algorithm through repeated iteration, and realizing a control target of the highest temperature and the temperature difference of the battery;
s7, synthesizing the composite phase change material with different heat conductivity coefficients or phase change points by adopting an experimental method according to the value of the simulation solution.
For example, in the battery pack gradient thermal management simulation method provided in one embodiment, the constraint condition that the phase change material phase change point temperature or the thermal conductivity coefficient in the different areas is optimized in S5 is as follows: the phase change point temperature interval of the composite phase change material is 38-46 ℃, and the heat conductivity coefficient interval is: 2-10W/mK.
For example, in the method for gradient thermal management simulation of a battery pack provided in one embodiment, the composite phase change material temperature and parameters in the battery thermal management system in S3 are the uniform initial temperature: 40 ℃.
The battery pack gradient thermal management device and the simulation method provided by some embodiments of the application have the beneficial effects that: according to the battery pack gradient thermal management device and the simulation method, the thermal management is carried out on the battery pack by using the method of coupling the composite phase change material and the liquid cooling, and in order to better balance the temperature difference of the battery, the gradient optimization design is carried out on the composite phase change material in different geometric intervals in the battery thermal management system, so that the initial heat absorption temperature of the composite phase change material is different or the heat conductivity coefficient is different, the temperature difference between battery packs can be balanced efficiently, the management performance is improved, the use safety performance of the battery packs is improved, the composite phase change material can absorb the heat of the battery, and the battery pack gradient thermal management device and the simulation method are high in structural stability, convenient to assemble and high in practicability and are worthy of popularization.
Drawings
In order to more clearly illustrate the embodiments of the present description or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a gradient thermal management device for a battery pack according to the present application;
FIG. 2 is a schematic diagram of a gradient thermal management device for a battery pack according to an embodiment;
fig. 3 is a flow chart of a battery pack gradient thermal management simulation method of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Unless defined otherwise, technical or scientific terms used in this disclosure should be given the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The terms "first," "second," and the like, as used in this disclosure, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed.
The first aspect of the present application provides a gradient thermal management device for a battery pack, as shown in fig. 1-2, comprising a battery pack 1 and a liquid cooling plate 2, wherein one end of the liquid cooling plate 2 is provided with a water inlet 21, and the other end is provided with a water outlet 22; the battery pack 1 is distributed on two sides of the liquid cooling plate 2, and the battery pack 1 is partitioned according to the temperature of the use state, wherein a gap between the battery pack 1 and the liquid cooling plate 2 is filled with a composite phase change material layer 3, the composite phase change material layer 3 can absorb heat of a battery, the composite phase change material layer 3 is coupled with the liquid cooling plate 2 to control the temperature of the battery pack 1, the composite phase change material layer 3 comprises expanded graphite and paraffin, the melting points of the paraffin around the battery pack 1 in different areas are different or the addition amount of the expanded graphite is different, so that gradient thermal management is performed on the battery pack 1.
Specifically, the composite phase change material is prepared from expanded graphite and paraffin through a melt blending method, wherein the expanded graphite is a heat conduction reinforcing agent, has a high heat conduction coefficient which can reach 100W/mK, and can be adjusted through controlling the addition amount of the expanded graphite; the paraffin is a phase-change material, has high phase-change latent heat, can absorb a large amount of heat through melting, and has the main components of linear paraffin, the melting point range of the paraffin is wider, the longer the number of the linear paraffin in the paraffin is, the higher the melting point of the paraffin is, and the paraffin with different melting points is selected as the phase-change material in different sections of a battery thermal management system by utilizing the characteristic of the paraffin, so that the temperature and the temperature difference of the battery are well controlled.
For example, in the gradient thermal management device for battery pack provided in one embodiment, the melting points of paraffin corresponding to the periphery of the battery pack 1 in different areas decrease in order of increasing the use state temperature of the battery pack 1 in different areas, so as to control the temperature and the temperature difference of the battery pack 1 in different areas.
Specifically, the temperature of the battery pack 1 in use increases in sequence along the direction from the water inlet 21 to the water outlet 22, so that the melting points of the paraffin wax around the battery pack 1 in different areas decrease in sequence along the direction from the water inlet 21 to the water outlet 22, so as to control the temperature and the temperature difference of the battery pack 1 in different areas.
For example, in the gradient thermal management device for battery packs provided in one embodiment, the addition amounts of the corresponding expanded graphite around the battery packs in different areas are sequentially increased in order of increasing the use state temperatures of the battery packs in different areas, so as to control the temperatures and the temperature differences of the battery packs in different areas.
Specifically, the temperature of the battery pack 1 in use increases in sequence along the direction from the water inlet 21 to the water outlet 22, so that the addition amount of the expanded graphite around the battery pack 1 in different areas increases in sequence along the direction from the water inlet 21 to the water outlet 22 to control the temperature and the temperature difference of the battery pack 1 in different areas.
According to the battery pack gradient heat management device disclosed by the embodiment of the application, the gradient design is performed on the phase change temperature or the heat conduction coefficient of the composite phase change material, so that in a battery heat management system, the composite phase change material in different areas has different phase change points, the phase change material is inserted in advance to absorb heat at a place (a position close to the water outlet 22) where the temperature of the battery pack 1 is higher, and the phase change material is inserted in the heat absorption delay at a place (a position close to the water inlet 21) where the temperature of the battery pack 1 is lower, thereby realizing temperature control of the battery pack and efficiently balancing the temperature difference between the battery packs, and improving the use safety performance of the battery pack.
For example, in one embodiment, a gradient thermal management device for a battery pack is provided, wherein the mass ratio of the expanded graphite to the paraffin wax is: 3: 7-1: 10.
for example, in one embodiment provides a battery pack gradient thermal management device, the paraffin wax has an initial phase transition point temperature of 38 ℃ to 46 ℃.
For example, in the gradient thermal management device for a battery pack according to one embodiment, the liquid cooling plate 2 is a direct-current liquid cooling plate, specifically, the liquid cooling plate 2 is an aluminum plate, and the internal flow channel is a straight line type in order to reduce the internal water flow resistance.
For example, in the gradient thermal management device for battery packs provided in one embodiment, as shown in fig. 2, the battery packs 1 are arranged in a double-row serial manner, and two rows of battery packs are respectively disposed at two sides of the liquid cooling plate 2 and are partitioned along a direction from the water inlet 21 to the water outlet 22.
Specifically, as shown in fig. 2, taking a battery pack with a serial distribution arrangement of 2×16 as an example, taking the length of each 4 batteries as a region, dividing the battery pack 1 into four regions, namely regions i, ii, iii and iv;
example 1
According to the battery pack gradient thermal management device disclosed by the application, temperature control treatment is carried out on a certain type of battery pack, as shown in fig. 2, the battery packs 1 are distributed and arranged in a 2 x 16 serial manner, firstly, every 4 batteries are in a region, the battery packs 1 are divided into four regions, the melting point of paraffin in a region I composite phase change material is set to 46 ℃, the melting point of paraffin in a region II is set to 44 ℃, the melting point of paraffin in a region III is set to 42 ℃, the melting point of paraffin in a region IV is set to 40 ℃, the time for absorbing heat of the composite phase change material is different due to the fact that the melting point of paraffin in a region IV is different, the temperature of the battery packs is higher, the temperature rise rate is higher, the phase change material is involved in absorbing heat in advance, the rapid temperature rise of the battery packs is restrained, and the temperature rise of the battery packs is delayed in the low temperature region, and the highest temperature and the temperature difference of the battery packs are well controlled at 45 ℃ and 3 ℃ by controlling the melting points of paraffin around the battery packs in different regions.
Example two
According to the battery pack gradient thermal management device disclosed by the application, temperature control treatment is carried out on a certain type of battery pack, as shown in fig. 2, the battery packs are distributed and arranged in a 2 x 16 series manner, firstly, each 4 battery packs are divided into four areas, gradient thermal conductivity is realized by adjusting the mass fraction ratio of expanded graphite to paraffin, the thermal conductivity of a composite phase-change material in an area I is 4W/(m.K), the thermal conductivity of a composite phase-change material in an area II is 6W/(m.K), the thermal conductivity of a composite phase-change material in an area III is 8W/(m.K), the thermal conductivity of a composite phase-change material in an area IV is 10W/(m.K), the utilization efficiency of the composite phase-change material is different due to the fact that the thermal conductivity of the composite phase-change material in each area is different, the temperature of the battery pack is higher, the temperature of the battery pack is increased at a higher temperature zone, the temperature of the temperature rising rate is higher, the utilization rate of the composite phase-change material is reduced at a lower temperature zone, the addition of the expanded graphite around the battery pack in the different areas is controlled, the battery pack is controlled, and the temperature difference between the battery pack and the battery pack is well controlled at the highest temperature of the battery pack and the highest temperature of the battery pack is controlled at 44 ℃.
The second aspect of the present application provides a battery pack gradient thermal management simulation method, as shown in fig. 3, comprising the following steps:
s1, carrying out different charge and discharge experiments on the battery according to the selected single battery to obtain the change relation of the temperature of the battery with time under different multiplying powers;
s2, fitting the heating power of the battery by using a polynomial according to a charging and discharging experimental result, calculating the heating power of the battery under the constant-current discharging condition, and using the polynomial for inputting heat source parameters in a simulation model;
s3, establishing a geometric model of the battery thermal management system, and setting model material parameters;
s4, simulating calculation, analyzing a temperature and temperature difference distribution rule of the battery pack according to a calculated and analyzed cloud chart, and dividing the battery pack into areas according to cloud chart gradients;
s5, optimizing the phase change point temperature or the heat conductivity coefficient of the composite phase change material in different areas by taking the highest temperature of the battery as 50 ℃ and the lowest temperature difference as an optimization target;
s6, obtaining optimal gradient parameters by using an intelligent optimization algorithm through repeated iteration, and realizing a control target of the highest temperature and the temperature difference of the battery;
s7, synthesizing the composite phase change material with different heat conductivity coefficients or phase change points by adopting an experimental method according to the value of the simulation solution.
For example, in the battery pack gradient thermal management simulation method provided in one embodiment, the constraint condition that the phase change material phase change point temperature or the thermal conductivity coefficient in the different areas is optimized in S5 is as follows: the phase change point temperature interval of the composite phase change material is 38-46 ℃, and the heat conductivity coefficient interval is: 2-10W/mK.
For example, in the method for gradient thermal management simulation of a battery pack provided in one embodiment, the composite phase change material temperature and parameters in the battery thermal management system in S3 are the uniform initial temperature: 40 ℃.
Although embodiments of the present application have been disclosed above, it is not limited to the details and embodiments shown and described, it is well suited to various fields of use for which the application would be readily apparent to those skilled in the art, and accordingly, the application is not limited to the specific details and illustrations shown and described herein, without departing from the general concepts defined in the claims and their equivalents.
Claims (10)
1. A battery pack gradient thermal management device, comprising:
the liquid cooling plate is provided with a water inlet at one end and a water outlet at the other end;
the battery packs are distributed on two sides of the liquid cooling plate and are partitioned according to the temperature of the battery packs in the use state;
the gap between the battery pack and the liquid cooling plate is filled with a composite phase change material layer, the composite phase change material layer is coupled with the liquid cooling plate to control the temperature of the battery pack, the composite phase change material layer comprises expanded graphite and paraffin, and the melting points of the paraffin around the battery pack in different areas or the addition amount of the expanded graphite are different so as to carry out gradient thermal management on the battery pack.
2. The gradient thermal management device for battery packs according to claim 1, wherein the melting points of paraffin corresponding to the periphery of the battery packs in different areas are sequentially decreased in order of increasing temperatures of the battery packs in different areas, so as to control the temperatures and the temperature differences of the battery packs in different areas.
3. The battery pack gradient heat management apparatus according to claim 1, wherein the amounts of the corresponding expanded graphite added around the battery packs in the different regions are sequentially increased in order of increasing temperatures of the battery packs in the different regions to control temperatures and temperature differences of the battery packs in the different regions.
4. The battery pack gradient thermal management device of claim 1, wherein the mass ratio of the expanded graphite to the paraffin wax is: 3: 7-1: 10.
5. the battery pack gradient thermal management device of claim 2, wherein the paraffin wax has an onset phase transition point temperature of 38 ℃ to 46 ℃.
6. The battery pack gradient thermal management device of claim 1, wherein the liquid cooling plate is a direct-current liquid cooling plate.
7. The gradient thermal management device for a battery pack according to claim 1, wherein the battery packs are arranged in a double-row serial manner, and the two rows of battery packs are respectively arranged at two sides of the liquid cooling device and are partitioned along a direction from the water inlet to the water outlet.
8. A battery pack gradient thermal management simulation method, which is characterized by adopting the battery pack gradient thermal management device as claimed in claim 1, comprising the following steps:
s1, carrying out different charge and discharge experiments on the battery according to the selected single battery to obtain the change relation of the temperature of the battery with time under different multiplying powers;
s2, fitting the heating power of the battery by using a polynomial according to a charging and discharging experimental result, calculating the heating power of the battery under the constant-current discharging condition, and using the polynomial for inputting heat source parameters in a simulation model;
s3, establishing a geometric model of the battery thermal management system, and setting model material parameters;
s4, simulating calculation, analyzing a temperature and temperature difference distribution rule of the battery pack according to a calculated and analyzed cloud chart, and dividing the battery pack into areas according to cloud chart gradients;
s5, optimizing the phase change point temperature or the heat conductivity coefficient of the composite phase change material in different areas by taking the highest temperature of the battery as 50 ℃ and the lowest temperature difference as an optimization target;
s6, obtaining optimal gradient parameters by using an intelligent optimization algorithm through repeated iteration, and realizing a control target of the highest temperature and the temperature difference of the battery;
s7, synthesizing the composite phase change material with different heat conductivity coefficients or phase change points by adopting an experimental method according to the value of the simulation solution.
9. The battery pack gradient thermal management simulation method according to claim 8, wherein the constraint condition for optimizing the phase change material phase change point temperature or the thermal conductivity in different areas in S5 is: the phase change point temperature interval of the composite phase change material is 38-46 ℃, and the heat conductivity coefficient interval is: 2-10W/mK.
10. The battery pack gradient thermal management simulation method according to claim 8, wherein the composite phase change material temperature and parameters in the battery thermal management system in S3 are a uniform initial temperature: 40 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311235288.6A CN117134030B (en) | 2023-09-25 | 2023-09-25 | Battery pack gradient thermal management device and simulation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311235288.6A CN117134030B (en) | 2023-09-25 | 2023-09-25 | Battery pack gradient thermal management device and simulation method |
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