CN113851755B - Battery pack heat conduction pad coefficient determination method and device and electronic equipment - Google Patents
Battery pack heat conduction pad coefficient determination method and device and electronic equipment Download PDFInfo
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- 238000010438 heat treatment Methods 0.000 claims description 22
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- 230000032683 aging Effects 0.000 claims description 15
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- 239000000853 adhesive Substances 0.000 description 13
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- 230000017525 heat dissipation Effects 0.000 description 9
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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
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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
- H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
- H01M10/625—Vehicles
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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
- H01M10/63—Control systems
- H01M10/635—Control systems based on ambient temperature
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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
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/655—Solid structures for heat exchange or heat conduction
- H01M10/6551—Surfaces specially adapted for heat dissipation or radiation, e.g. fins or coatings
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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
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/655—Solid structures for heat exchange or heat conduction
- H01M10/6554—Rods or plates
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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
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/655—Solid structures for heat exchange or heat conduction
- H01M10/6556—Solid parts with flow channel passages or pipes for heat exchange
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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
- H01M10/65—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
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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
- 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 invention provides a method and a device for determining a coefficient of a heat conduction pad of a battery pack and electronic equipment, which relate to the technical field of battery pack application, wherein the heat conduction pad is arranged between a battery module of the battery pack and a water cooling plate, and the method comprises the following steps: determining a first thermal resistance range of the heat conducting pad according to a preset severe working condition and a preset battery cell standard of the current vehicle; determining a second thermal resistance value range based on a preset safety coefficient and the first thermal resistance value range; and the heat conductivity coefficient range is determined based on the heat resistance calculation formula and the second heat resistance value range, and the heat conductivity coefficient capable of meeting severe working conditions is determined, so that the cost is saved on the basis of ensuring driving safety without excessively requiring excellent heat conductivity.
Description
Technical Field
The invention relates to the technical field of battery pack application, in particular to a method and a device for determining a coefficient of a heat conduction pad of a battery pack and electronic equipment.
Background
With the development and popularization of vehicle technology, people are used to driving and traveling at present, and the driving safety of vehicles is also a focus of attention.
The application safety of a vehicle battery pack is an important link in vehicle safety. When the current battery pack is in a severe working condition of the vehicle, if the use safety cannot be guaranteed, the safety of a driver can be threatened. Therefore, the battery pack nowadays often selects a heat conductive pad with better heat dissipation performance, but the cost is higher.
Disclosure of Invention
In view of the above, the invention aims to provide a method, a device and an electronic device for determining a thermal conductivity of a battery pack, which can meet the thermal conductivity of a severe working condition by determining the thermal conductivity, and which does not excessively require excellent thermal conductivity, thereby saving cost on the basis of ensuring driving safety.
In a first aspect, an embodiment provides a method for determining a coefficient of thermal conductivity of a battery pack, the thermal conductivity being disposed between a battery module and a water cooling plate of the battery pack, the method comprising:
determining a first thermal resistance range of the heat conducting pad according to a preset severe working condition and a preset battery cell standard of a current vehicle;
determining a second thermal resistance range based on a preset safety coefficient and the first thermal resistance range, wherein the preset safety coefficient is set according to the contact thermal resistance and the aging condition of the heat conducting pad;
and determining a heat conductivity coefficient range based on the heat resistance calculation formula and the second heat resistance value range.
In an alternative embodiment, the step of determining the first thermal resistance range of the thermal pad according to the preset severe working condition and the preset cell standard of the current vehicle includes:
determining a first maximum allowable temperature of the battery module and a second maximum allowable temperature of the liquid cooling plate according to a preset battery cell standard of the battery pack;
determining the total heating value of the battery module according to the preset severe working condition of the current vehicle;
and calculating a first thermal resistance value range of the heat conducting pad based on the total heating value and a heat exchange temperature difference, wherein the heat exchange temperature difference is the difference between the first maximum allowable temperature and the second maximum allowable temperature.
In an alternative embodiment, the step of calculating the first thermal resistance range of the thermal pad based on the total heating value and the heat exchange temperature difference includes:
calculating the ratio of the heat exchange temperature difference to the total heating value;
a first range of thermal resistance values for the thermal pad is defined based on the ratio, wherein the first thermal resistance values do not exceed the ratio.
In an alternative embodiment, the step of determining the second thermal resistance range based on the preset safety factor and the first thermal resistance range comprises:
and determining a second thermal resistance range based on the first thermal resistance range divided by a preset safety coefficient.
In an alternative embodiment, the step of determining the thermal conductivity range based on the thermal resistance calculation formula and the second thermal resistance range includes:
obtaining a thermal resistance calculation formula, and calculating target thermal resistance, wherein the thermal resistance calculation formula comprises the following specific steps:
and limiting the target thermal resistance based on the second thermal resistance value range, and determining a thermal conductivity coefficient range.
In an alternative embodiment, the method further comprises:
inputting a target heat conductivity coefficient meeting the heat conductivity coefficient range into a simulation model for verification;
and if the heat conduction pad with the target heat conduction coefficient meets the target working condition requirement of the current vehicle, verifying to pass.
In an alternative embodiment, the method further comprises:
and if the target heat conduction coefficient passes the verification, assembling the battery pack based on the heat conduction pad of the target heat conduction coefficient.
In a second aspect, an embodiment provides a device for determining a coefficient of thermal conductivity of a battery pack, the thermal conductivity being disposed between a battery module and a water cooling plate of the battery pack, the device comprising:
the first thermal resistance determining module is used for determining a first thermal resistance value range of the heat conducting pad according to a preset severe working condition and a preset battery cell standard of a current vehicle;
the second thermal resistance determining module is used for determining a second thermal resistance value range based on a preset safety coefficient and the first thermal resistance value range, wherein the preset safety coefficient is set according to the contact thermal resistance and the ageing condition of the heat conducting pad;
and the heat conductivity coefficient determining module is used for determining a heat conductivity coefficient range based on a heat resistance calculation formula and the second heat resistance value range.
In a third aspect, an embodiment provides an electronic device, including a memory, a processor, where the memory stores a computer program executable on the processor, and where the processor implements the steps of the method according to any of the foregoing embodiments when the computer program is executed.
In a fourth aspect, embodiments provide a machine-readable storage medium storing machine-executable instructions that, when invoked and executed by a processor, cause the processor to implement the steps of the method of any of the preceding embodiments.
According to the method, the device and the electronic equipment for determining the coefficient of the heat conduction pad of the battery pack, the first heat resistance range of the heat conduction pad which can meet the working condition and the standard is determined through the preset severe working condition and the standard which the battery pack cell should meet, on the basis, the inventor researches that in order to further guarantee the reliability of the application of the battery pack, the second heat resistance range is defined by combining the safety coefficient which is preset in relation to the aging condition of the heat conduction pad, the target heat resistance calculated based on the heat resistance calculation formula is required to meet the second heat resistance range, the heat conduction coefficient range is determined through inequality transformation, and the heat conduction pad which is determined according to the heat conduction coefficient range can save the cost on the basis of meeting the driving safety of a vehicle.
Additional features and advantages of the disclosure will be set forth in the description which follows, or in part will be obvious from the description, or may be learned by practice of the techniques of the disclosure.
The foregoing objects, features and advantages of the disclosure will be more readily apparent from the following detailed description of the preferred embodiments taken in conjunction with the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of a method for determining a thermal pad coefficient of a battery pack according to an embodiment of the present invention;
fig. 2 is a schematic cross-sectional view of a battery pack according to an embodiment of the present invention;
fig. 3 is a schematic cross-sectional view of a heat conducting structure of a chip according to an embodiment of the present invention;
FIG. 4 is a functional block diagram of a device for determining a thermal conductivity of a battery pack according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a hardware architecture of an electronic device according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
At present, in order to ensure the driving safety of a vehicle, a battery pack with better heat dissipation performance and a heat conduction structure are often selected, so that the application safety of the battery pack and the vehicle can be ensured under the severe working condition of the vehicle. However, the better the heat dissipation performance, the higher the cost of the battery pack and the heat conduction structure, and in order to ensure driving safety, the more expensive devices are selected, so that the cost performance is lower, and the battery pack and the heat conduction structure are not easy to widely apply.
Based on the above, according to the method for determining the coefficient of the thermal conductivity of the battery pack, the thermal conductivity of the optimal thermal conductivity pad which can meet the current safety of the vehicle is determined, so that the battery pack can adapt to a worse working condition without causing excessive increase of cost.
For the sake of understanding the present embodiment, first, a method for determining a coefficient of thermal conductivity of a battery pack disclosed in the present embodiment of the present invention is described in detail, where the method may be applied to a controller, an intelligent device, a server, and other devices.
Fig. 1 is a flowchart of a method for determining a thermal conductivity of a battery pack according to an embodiment of the present invention.
As shown in fig. 1, the method comprises the steps of:
step S102, determining a first thermal resistance range of the heat conducting pad according to a preset severe working condition and a preset battery cell standard of the current vehicle.
The preset severe working conditions can be the worst working conditions of the vehicle, which are set by a worker according to factors such as the model of the current vehicle, the behavior habit of a driving user, the common driving environment and the like. The preset cell standard is a criterion that industry-specified cells need to meet. The heat conducting pad 20 is disposed between the battery module 10 and the water cooling plate 30 of the battery pack, as shown in fig. 2, wherein the heat conducting pad 20 has a thermal resistance, and a target heat conducting coefficient of the heat conducting pad is obtained according to the determination of the range of the thermal resistance, so that the battery pack formed by the heat conducting pad, the battery module and the water cooling plate under the target heat conducting coefficient can adapt to a severe working condition of a vehicle, and the driving safety of the vehicle is ensured.
Step S104, determining a second thermal resistance range based on a preset safety coefficient and the first thermal resistance range, wherein the preset safety coefficient is used for reducing and improving error influence caused by aging conditions of the contact thermal resistance and the thermal pad, and the preset safety coefficient is set according to the aging conditions of the contact thermal resistance and the thermal pad.
It should be noted that, as the heat conducting pad itself is aged, its own heat conducting property is changed through the study of the inventor. The preset safety coefficient refers to checking according to the contact thermal resistance and the ageing condition of the heat conducting pad in advance, and correspondingly setting a safety coefficient so that the current contact thermal resistance and the ageing condition of the heat conducting pad have no influence on the determination of the heat conducting coefficient of the heat conducting pad according to the safety coefficient, and the accuracy of the determination of the heat conducting coefficient is ensured. I.e. the second thermal resistance range is more accurate than the first thermal resistance range.
Step S106, a heat conductivity coefficient range is determined based on the heat resistance calculation formula and the second heat resistance range.
The thermal resistance calculation formula is a formula for calculating thermal resistance, and the thermal resistance of the thermal pad can be calculated through some characteristic parameters of the thermal pad.
In a preferred embodiment of practical application, a first thermal resistance range of the thermal pad capable of meeting the working condition and the standard is determined according to a preset severe working condition and the standard which the battery pack cell should meet, on the basis, the inventor researches that in order to further ensure the reliability of the battery pack application, a second thermal resistance range is defined by combining a safety coefficient preset in relation to the aging condition of the thermal pad, the target thermal resistance calculated based on a thermal resistance calculation formula is required to meet the second thermal resistance range, and the thermal conductivity coefficient range is determined through inequality transformation, so that the thermal pad determined according to the thermal conductivity coefficient range can save cost on the basis of meeting the driving safety of a vehicle.
In some embodiments, the thermal resistance range of the thermal pad may be defined, so that the thermal pad satisfying the thermal resistance range can satisfy the severe working condition in the driving process, and has reliability. As an example, the step S102 may include the steps of:
step 1.1), determining a first maximum allowable temperature of the battery module and a second maximum allowable temperature of the liquid cooling plate according to a preset cell standard of the battery pack.
In order to ensure the reliability of the battery cell, the industry presets a battery cell standard, and based on the preset battery cell standard, for example, a first maximum allowable temperature m of the battery cell of the battery module and a second maximum allowable temperature n of the liquid cooling plate can be determined.
Step 1.2), determining the total heating value of the battery module according to the preset severe working condition of the current vehicle.
For example, the worst working condition of the current vehicle is determined according to the frequent running environment of the current vehicle, and the total heating value of the single module is calculated to be phi based on the worst working condition, specifically, I 2 And R is calculated. Wherein I is a current value, R is a cell resistor, and n isThe number of cells in the module. The heating value of each battery module is obtained in the mode, and then the total heating value of the battery modules is obtained.
Step 1.3), calculating a first thermal resistance range of the heat conducting pad based on the total heating value and a heat exchange temperature difference, wherein the heat exchange temperature difference is the difference between the first maximum allowable temperature and the second maximum allowable temperature.
It should be noted that the heat exchange temperature difference Δt may be determined according to the first maximum allowable temperature m of the module and the second maximum allowable temperature n of the water cooling plate, specifically Δt=m—n.
Based on the step 1.3), the thermal resistance value range of the thermal pad can be determined through the total heating value and the heat exchange temperature difference, so that the thermal pad meeting the required thermal resistance value range can ensure the driving safety of the vehicle. As an example, the method may specifically further include the steps of:
step 1.3.1), calculating the ratio of the heat exchange temperature difference to the total heating value.
Step 1.3.2), defining a first thermal resistance range of the thermal pad based on the ratio, wherein the first thermal resistance does not exceed the ratio.
Illustratively, through R t Calculating a first thermal resistance value R of a theoretical thermal resistance value of the thermal pad less than or equal to delta T/phi t As an example, R t Optionally 0.05K/W.
In some embodiments, the thermal resistance range may be defined such that aging of the thermal pad and the contact resistance does not affect the selection of the thermal pad. As an example, the step S104 may include the steps of:
step 2.1), determining a second thermal resistance range based on the first thermal resistance range divided by a preset safety coefficient.
In this embodiment of the present invention, the influence of the contact thermal resistance and the aging of the thermal pad is considered at the same time, and as an alternative embodiment, the thermal resistance should consider a safety factor of 1.2 times, that is, the second thermal resistance value is less than or equal to 0.05/1.2=0.04.
In some embodiments, the thermal conductivity range may be determined so that the thermal pad of the thermal conductivity is selected to ensure safe use of the battery pack to which the thermal pad of the model is applied. As an example, the step S106 may include the steps of:
step 3.1), a thermal resistance calculation formula is obtained, and a target thermal resistance is calculated, wherein the method comprises the following steps:
the target thermal resistance can be obtained according to the compressed thickness of the heat conducting pad and the ratio of the effective heat exchange area of the heat conducting pad to the product of the heat conducting coefficient of the heat conducting pad.
And 3.2), limiting the target thermal resistance based on the second thermal resistance value range, and determining a thermal conductivity coefficient range.
It should be noted that, in order to ensure use safety, the target thermal resistance obtained by the above thermal resistance calculation formula also needs to satisfy the second thermal resistance value range, so that the thermal conductivity coefficient range can be determined through the transformation of the thermal exchange thermal resistance formula, and the thermal pad selection is realized according to the thermal conductivity coefficient range, that is, the target thermal resistance needs not to exceed the second thermal resistance value range determined in the above steps, and the thermal conductivity coefficient calculation formula is as follows through the transformation of the left side and the right side of the inequality:
wherein the second thermal resistance range is 0.04.
In some embodiments, the thermal conductivity may be verified prior to the thermal conductivity being selected based on the thermal conductivity range to ensure accuracy in the thermal conductivity selection. As an example, the above steps may further include the steps of:
and 4.1), inputting the target heat conductivity coefficient meeting the heat conductivity coefficient range into a simulation model for verification.
The thermal conductivity coefficient capable of meeting the thermal conductivity coefficient range can meet the application requirement and industry standard of the severe working condition of the vehicle in theory, and as an optional embodiment, the minimum thermal conductivity coefficient capable of meeting the requirement can be preset and selected as the target thermal conductivity coefficient, and the cost of the thermal pad selected according to the target thermal conductivity coefficient is low.
And 4.2), if the heat conduction pad configured with the target heat conduction coefficient meets the target working condition requirement of the current vehicle, verifying to pass.
Here, the target thermal conductivity coefficient is carried into the simulation model for verification, and whether the thermal pad with the target thermal conductivity coefficient can meet other required working conditions of the current vehicle is judged. If yes, the verification is passed; if not, the verification is not passed, the steps of the previous embodiment are repeated, a new target heat conductivity coefficient is recalculated, and the verification is performed again until the verification is passed.
As another alternative embodiment, different constituent materials exist in the thermal pad, and corresponding geometric modeling can be performed on the thermal pad layer of each material to ensure verification accuracy; for example, if the thermal pad is a multi-layer material, geometric modeling of multiple layers is required, and the different layers give corresponding thermal conductivity coefficients; when the parameters are given to the heat conducting pad, the heat conducting coefficient of the heat conducting pad after aging is considered, namely the heat performance of the heat conducting pad after aging is required to still meet the requirement that the temperature of the battery cell does not exceed the standard.
In the simulation model, the heat productivity of the battery core of the heat conduction cushion layer with the target heat conductivity is calculated, and whether the heat productivity exceeds the standard is judged to verify whether the type selection of the heat conduction cushion layer is qualified. It should be noted that, at the same time, the influence of the increase in the battery cell internal during the term termination EOL phase, which leads to the increase in the battery heating value, needs to be considered. Illustratively, during the simulation process, the highest temperature of the battery cell is monitored in real time in the whole course to satisfy T Monitoring temperature ≤T Allowable temperature The method comprises the steps of carrying out a first treatment on the surface of the If not, reconsidering whether the target thermal conductivity is reasonable under the severe working conditions and the thermal resistance.
In some embodiments, the thermal pad may be selected according to a target thermal conductivity coefficient, so that the reliability of the battery pack and the vehicle equipped with the target thermal pad is high during driving. As an example, the above steps may further include the steps of:
step 5.1), if the target thermal conductivity coefficient passes the verification, assembling the battery pack based on the thermal pad with the target thermal conductivity coefficient.
In some embodiments, the thermal pad selected according to the target thermal conductivity coefficient can be assembled into a whole battery pack, and the battery pack is verified by a machine or manually to judge whether the required working condition can meet the requirement.
According to the embodiment of the invention, firstly, according to the worst working condition of an electric automobile, under the condition of meeting the reliability requirement of a battery cell, the theoretical value of the thermal resistance of a heat conducting pad is estimated, then, after the safety coefficient which is 1.2 times of the thermal resistance is considered, the thermal conductivity coefficient (the value range) is determined through a thermal exchange resistance formula, then, the determined thermal conductivity coefficient is input into a simulation model for verification, whether the thermal conductivity coefficient can meet other required working conditions of the vehicle is judged, and finally, the heat conducting pad corresponding to the determined thermal conductivity coefficient, the battery cell and a cold plate are assembled into the vehicle for actual operation verification. In order to ensure through the suitable heat conduction pad of the coefficient of heat conductivity of determining, can guarantee the normal operating of vehicle to practice thrift the cost of heat conduction pad. Since the higher the thermal conductivity of the thermal pad, the better the heat dissipation, but the cost will increase accordingly, the thermal pad with the appropriate thermal conductivity needs to be selected so that it can meet the heat dissipation requirement, and the cost will not increase.
On the basis of the foregoing embodiments, the method for determining the coefficient of thermal conductivity of the battery pack according to the embodiments of the present invention may also be applied to the selection of the coefficient of thermal conductivity of the thermal conductive structural adhesive, as shown in fig. 3, where the heat of the chip is transferred to the thermal conductive boss through the thermal conductive adhesive, then transferred to the thermal conductive structural adhesive, and finally to the water-cooling plate. Wherein, heat conduction glue, heat conduction boss and heat conduction structure glue constitute thermal resistance Rt.
Firstly, screening a chip model 1 with the largest heat dissipation demand, and calculating thermal resistance Rt based on the following parameters of the chip model 1;
the highest temperature of the chip is less than or equal to 125 ℃, and the surface temperature of the chip which participates in the calculation of the heat conductivity coefficient is less than or equal to 120 ℃; maximum heat generation value Φ=19.8w of chip, and chip area a=0.000625 m 2 The method comprises the steps of carrying out a first treatment on the surface of the The highest temperature of the water cooling plate is 55 DEG C。
The thermal resistance calculation formula is: r is R t ＝△T/Φ；
Wherein R is t The delta T is the heat exchange temperature difference between the water cooling plate and the chip, 120-55=65 ℃, phi is the heat productivity of the chip, 19.8W, and the heat resistance R is calculated t The theoretical value is =.DELTA.T/phi = 65 ℃/19.8W = 3.28 ℃/W, and the theoretical value which can be born by the thermal resistance under the action of the chip model 1 with the largest heat dissipation requirement can be known.
And determining the heat conductivity coefficient of the heat-conducting structural adhesive based on the theoretical heat resistance value so as to meet the standard.
According to a thermal resistance calculation formula R=delta/(A lambda), wherein A is the heat transfer area of the chip, delta is the thickness of the chip, and lambda is the heat conductivity coefficient of the chip; considering that the bonding area of the heat-conducting adhesive is limited, the actual bonding area is only 70% of the theoretical value, namely the heat transfer area A is selected to be 0.7.
R t ＝R Heat-conducting glue +R Heat conduction boss +R Heat conduction structural adhesive ≤3.28℃/W
＝1/A*(δ Heat-conducting glue /λ Heat-conducting glue +δ Heat conduction boss /λ Heat conduction boss +δ Heat conduction structural adhesive /λ Heat conduction structural adhesive )≤3.28℃/W
＝1/(0.7×0.000625)×(0.001/3.6+0.008/96+0.0007/λ Heat conduction structural adhesive )≤3.28℃/W
Then estimate lambda Heat conduction structural adhesive Not less than 0.73W/mK, and considering the design allowance with the safety coefficient of 1.2, the lowest heat conduction coefficient of the heat conduction structural adhesive is 0.88W/mK, and the whole is 1W/mK.
Therefore, based on the chip model 1 with the largest heat dissipation demand, the heat conduction coefficient of the heat conduction structural adhesive is more than or equal to 1W/m.K, the actual measurement value is not lower than 0.9W/m.K, the heat conduction coefficient can meet the heat dissipation demand of chips of any model, and the heat conduction structural adhesive is further selected.
As shown in fig. 4, an embodiment of the present invention further provides a device 400 for determining a thermal pad coefficient of a battery pack, where the device includes:
the first thermal resistance determining module 401 determines a first thermal resistance value range of the heat conducting pad according to a preset severe working condition and a preset battery cell standard of the current vehicle;
a second thermal resistance determining module 402, configured to determine a second thermal resistance range based on a preset safety coefficient and the first thermal resistance range, where the preset safety coefficient is set according to a contact thermal resistance and an aging condition of the thermal pad;
the thermal conductivity determining module 403 determines a thermal conductivity range based on the thermal resistance calculation formula and the second thermal resistance range.
In the practical application process, the thermal resistance value range of the battery pack thermal pad can be limited based on the preset severe working condition of the current vehicle, industry standard and the like, the thermal pad coefficient range which can meet the above disclosure and the industry standard is determined through the inequality relation between the thermal resistance calculation formula and the satisfaction of the thermal resistance range, and the target coefficient is determined based on the range, so that the thermal pad selection is realized, and the cost is saved on the basis of ensuring the driving safety of the vehicle.
In some embodiments, the first thermal resistance determining module 401 is further specifically configured to determine, according to a preset cell standard of the battery pack, a first maximum allowable temperature of the battery module and a second maximum allowable temperature of the liquid cooling plate; determining the total heating value of the battery module according to the preset severe working condition of the current vehicle; and calculating a first thermal resistance value range of the heat conducting pad based on the total heating value and a heat exchange temperature difference, wherein the heat exchange temperature difference is the difference between the first maximum allowable temperature and the second maximum allowable temperature.
In some embodiments, the first thermal resistance determination module 401 is further specifically configured to calculate a ratio of the heat exchange temperature difference and the total heating value; a first range of thermal resistance values for the thermal pad is defined based on the ratio, wherein the first thermal resistance values do not exceed the ratio.
In some embodiments, the second thermal resistance determination module 402 also determines the second thermal resistance range based on the first thermal resistance range divided by a preset safety factor.
In some embodiments, the second thermal resistance determining module 402 is further specifically configured to obtain a thermal resistance calculation formula, and calculate the target thermal resistance, where the thermal resistance calculation formula is specifically:
and limiting the target thermal resistance based on the second thermal resistance value range, and determining a thermal conductivity coefficient range.
In some embodiments, the apparatus further comprises a verification module for inputting a target thermal conductivity that satisfies the thermal conductivity range into a simulation model for verification; and if the heat conduction pad with the target heat conduction coefficient meets the target working condition requirement of the current vehicle, verifying to pass.
In some embodiments, the apparatus further comprises an assembly control module for assembling the battery pack based on the thermal pad of the target thermal conductivity if the target thermal conductivity is verified.
Fig. 5 is a schematic hardware architecture of an electronic device 500 according to an embodiment of the present invention. Referring to fig. 5, the electronic device 500 includes: a machine-readable storage medium 501 and a processor 502, and may also include a non-volatile storage medium 503, a communication interface 504, and a bus 505; wherein the machine-readable storage medium 501, the processor 502, the non-volatile storage medium 503, and the communication interface 504 accomplish communication with each other via the bus 505. The above embodiments describe methods of determining battery pack thermal conductivity by the processor 502 reading and executing machine-executable instructions of determining battery pack thermal conductivity in the machine-readable storage medium 501.
The machine-readable storage medium referred to herein may be any electronic, magnetic, optical, or other physical storage device that can contain or store information, such as executable instructions, data, or the like. For example, a machine-readable storage medium may be: RAM (RadomAccess Memory, random access memory), volatile memory, non-volatile memory, flash memory, a storage drive (e.g., hard drive), any type of storage disk (e.g., optical disk, dvd, etc.), or a similar storage medium, or a combination thereof.
The non-volatile medium may be a non-volatile memory, a flash memory, a storage drive (e.g., hard drive), any type of storage disk (e.g., optical disk, dvd, etc.), or a similar non-volatile storage medium, or a combination thereof.
It can be understood that the specific operation method of each functional module in this embodiment may refer to the detailed description of the corresponding steps in the above method embodiment, and the detailed description is not repeated here.
The embodiment of the invention provides a computer readable storage medium, in which a computer program is stored, and when the computer program code is executed, the method for determining the coefficient of thermal conductivity of a battery pack according to any one of the embodiments is implemented, and specific implementation can be found in the method embodiment and will not be described herein.
It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described system and apparatus may refer to corresponding procedures in the foregoing method embodiments, which are not described herein again.
In addition, in the description of embodiments of the present invention, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Finally, it should be noted that: the above examples are only specific embodiments of the present invention, and are not intended to limit the scope of the present invention, but it should be understood by those skilled in the art that the present invention is not limited thereto, and that the present invention is described in detail with reference to the foregoing examples: any person skilled in the art may modify or easily conceive of the technical solution described in the foregoing embodiments, or perform equivalent substitution of some of the technical features, while remaining within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention, and are intended to be included in the scope of the present invention.
Claims (6)
1. A method for determining a thermal conductivity of a battery pack, the thermal conductivity being disposed between a battery module and a water cooling plate of the battery pack, the method comprising:
determining a first thermal resistance range of the heat conducting pad according to a preset severe working condition and a preset battery cell standard of a current vehicle;
determining a second thermal resistance range based on a preset safety coefficient and the first thermal resistance range, wherein the preset safety coefficient is used for reducing error influence generated by contact thermal resistance and aging conditions of the heat conducting pad;
determining a thermal conductivity range based on a thermal resistance calculation formula and the second thermal resistance range;
determining a first thermal resistance range of the thermal pad according to a preset severe working condition and a preset battery cell standard of a current vehicle, wherein the step comprises the following steps:
determining a first maximum allowable temperature of the battery module and a second maximum allowable temperature of the liquid cooling plate according to a preset battery cell standard of the battery pack;
determining the total heating value of the battery module according to the preset severe working condition of the current vehicle;
calculating a first thermal resistance value range of the heat conducting pad based on the total heating value and a heat exchange temperature difference, wherein the heat exchange temperature difference is the difference between the first maximum allowable temperature and the second maximum allowable temperature;
based on the total heating value and the heat exchange temperature difference, calculating a first thermal resistance value range of the heat conducting pad, wherein the method comprises the following steps:
calculating the ratio of the heat exchange temperature difference to the total heating value;
defining a first range of thermal resistance values for the thermal pad based on the ratio, wherein the first thermal resistance values do not exceed the ratio;
determining a second thermal resistance range based on a preset safety coefficient and the first thermal resistance range, wherein the method comprises the following steps of:
determining a second thermal resistance range based on the first thermal resistance range divided by a preset safety factor;
determining a thermal conductivity range based on a thermal resistance calculation formula and the second thermal resistance range, comprising:
obtaining a thermal resistance calculation formula, and calculating a target thermal resistance, wherein the thermal resistance calculation formula is specifically as follows:
and limiting the target thermal resistance based on the second thermal resistance value range, and determining a thermal conductivity coefficient range.
2. The method according to claim 1, wherein the method further comprises:
inputting a target heat conductivity coefficient meeting the heat conductivity coefficient range into a simulation model for verification;
and if the heat conduction pad with the target heat conduction coefficient meets the target working condition requirement of the current vehicle, verifying to pass.
3. The method according to claim 2, wherein the method further comprises:
and if the target heat conduction coefficient passes the verification, assembling the battery pack based on the heat conduction pad of the target heat conduction coefficient.
4. A device for determining a thermal conductivity of a battery pack, the thermal conductivity being disposed between a battery module and a water cooling plate of the battery pack, the device comprising:
the first thermal resistance determining module is used for determining a first thermal resistance value range of the heat conducting pad according to a preset severe working condition and a preset battery cell standard of a current vehicle;
the second thermal resistance determining module is used for determining a second thermal resistance value range based on a preset safety coefficient and the first thermal resistance value range, wherein the preset safety coefficient is set according to the contact thermal resistance and the ageing condition of the heat conducting pad;
the heat conductivity coefficient determining module is used for determining a heat conductivity coefficient range based on a heat resistance calculation formula and the second heat resistance value range;
the first thermal resistance determining module is further used for determining a first maximum allowable temperature of the battery module and a second maximum allowable temperature of the liquid cooling plate according to a preset cell standard of the battery pack; determining the total heating value of the battery module according to the preset severe working condition of the current vehicle; calculating a first thermal resistance value range of the heat conducting pad based on the total heating value and a heat exchange temperature difference, wherein the heat exchange temperature difference is the difference between the first maximum allowable temperature and the second maximum allowable temperature;
the first thermal resistance determining module is also used for calculating the ratio of the heat exchange temperature difference to the total heating value; defining a first range of thermal resistance values for the thermal pad based on the ratio, wherein the first thermal resistance values do not exceed the ratio;
the second thermal resistance determining module is further used for determining a second thermal resistance range based on the first thermal resistance range divided by a preset safety coefficient;
the first thermal resistance determining module is further used for obtaining a thermal resistance calculation formula and calculating target thermal resistance, and the thermal resistance calculation formula is specifically as follows:
and limiting the target thermal resistance based on the second thermal resistance value range, and determining a thermal conductivity coefficient range.
5. An electronic device comprising a memory, a processor, the memory having stored thereon a computer program executable on the processor, characterized in that the processor, when executing the computer program, implements the steps of the method of any of the preceding claims 1 to 3.
6. A machine-readable storage medium storing machine-executable instructions which, when invoked and executed by a processor, cause the processor to perform the steps of the method of any one of claims 1 to 3.
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| CN115882110B (en) * | 2022-12-28 | 2025-08-08 | 欣旺达动力科技股份有限公司 | Battery packs and electrical equipment |
| CN116579124A (en) * | 2023-03-31 | 2023-08-11 | 东软睿驰汽车技术（沈阳）有限公司 | Selection method, device, equipment and medium of automotive electronic water pump |
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