CN113851755A - Method and device for determining coefficient of heat conducting pad of battery pack and electronic equipment - Google Patents

Method and device for determining coefficient of heat conducting pad of battery pack and electronic equipment Download PDF

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CN113851755A
CN113851755A CN202111111765.9A CN202111111765A CN113851755A CN 113851755 A CN113851755 A CN 113851755A CN 202111111765 A CN202111111765 A CN 202111111765A CN 113851755 A CN113851755 A CN 113851755A
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thermal resistance
heat
determining
resistance value
thermal
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CN113851755B (en
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王宁
孙永刚
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Neusoft Reach Automotive Technology Shenyang Co Ltd
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Neusoft Reach Automotive Technology Shenyang Co Ltd
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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
    • 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
    • H01M10/63—Control systems
    • H01M10/635—Control systems based on ambient 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
    • H01M10/65—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
    • 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
    • H01M10/655—Solid structures for heat exchange or heat conduction
    • H01M10/6556—Solid parts with flow channel passages or pipes for heat exchange
    • 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
    • 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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  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Automation & Control Theory (AREA)
  • Secondary Cells (AREA)
  • Battery Mounting, Suspending (AREA)

Abstract

The invention provides a method and a device for determining coefficients of a heat conducting pad of a battery pack and electronic equipment, and relates to the technical field of battery pack application, wherein the heat conducting pad is arranged between a battery module and a water cooling plate of the battery pack, and the method comprises the following steps: determining a first thermal resistance value range of the heat conducting pad according to the preset severe working condition and the preset electric core standard of the current vehicle; determining a second thermal resistance value range based on a preset safety factor and the first thermal resistance value range; and determining the range of the heat conductivity coefficient based on a heat resistance calculation formula and the range of the second heat resistance value, and saving the cost on the basis of ensuring the driving safety by determining the coefficient of the heat conducting pad which can meet the severe working conditions but not excessively requiring the excellent heat conducting performance.

Description

Method and device for determining coefficient of heat conducting pad of battery pack and electronic equipment
Technical Field
The invention relates to the technical field of battery pack application, in particular to a method and a device for determining coefficients of a heat conducting pad of a battery pack and electronic equipment.
Background
With the development and popularization of vehicle technology, people are used to driving for traveling at present, and the driving safety of vehicles also becomes a key point of more concern.
The safety of the application of the vehicle battery pack is an important link in the safety of the vehicle. When the current battery package is in abominable operating mode at the vehicle, if can not guarantee safe in utilization, then can threaten driver's safety. Therefore, the heat conductive pad with better heat dissipation performance is often selected for the battery pack, but the cost is higher.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a method and an apparatus for determining a thermal pad coefficient of a battery pack, and an electronic device, which are capable of saving cost while ensuring driving safety by determining a thermal pad coefficient that can satisfy severe conditions without excessively requiring excellent thermal conductivity.
In a first aspect, an embodiment provides a method for determining a coefficient of a heat conducting pad of a battery pack, where the heat conducting pad is disposed between a battery module and a water cooling plate of the battery pack, and the method includes:
determining a first thermal resistance value range of the heat conducting pad according to the preset severe working condition and the preset electric core standard of the current vehicle;
determining a second thermal resistance value range based on a preset safety factor and the first thermal resistance value range, wherein the preset safety factor is set according to the contact thermal resistance and the aging condition of the heat conducting pad;
and determining a thermal conductivity range based on a thermal resistance calculation formula and the second thermal resistance value range.
In an optional embodiment, the step of determining the first thermal resistance value range of the thermal pad according to a preset severe working condition and a preset electric core standard of a 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 core standard of the battery pack;
determining the total heat productivity 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 heat productivity and the 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 optional embodiment, the step of calculating the first thermal resistance value range of the heat conducting pad based on the total heat generation amount and the heat exchange temperature difference includes:
calculating the ratio of the heat exchange temperature difference to the total heating value;
a first thermal resistance value range of the thermal pad is defined based on the ratio, wherein the first thermal resistance value does not exceed the ratio.
In an alternative embodiment, the step of determining a second range of thermal resistance values based on a preset safety factor and said first range of thermal resistance values comprises:
and determining a second thermal resistance value range based on the first thermal resistance value range divided by a preset safety factor.
In an alternative embodiment, the step of determining the thermal conductivity range based on the thermal resistance calculation formula and the second thermal resistance value range includes:
obtaining a thermal resistance calculation formula and calculating a target thermal resistance, wherein the thermal resistance calculation formula is specifically as follows:
Figure BDA0003270459490000021
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 the target heat conductivity coefficient meeting the heat conductivity coefficient range into a simulation model for verification;
and if the heat conducting pad configured with the target heat conductivity coefficient meets the target working condition requirement of the current vehicle, the verification is passed.
In an alternative embodiment, the method further comprises:
and if the target heat conductivity coefficient passes the verification, assembling the battery pack based on the heat conducting pad with the target heat conductivity coefficient.
In a second aspect, an embodiment provides an apparatus for determining a coefficient of a thermal pad of a battery pack, the thermal pad being disposed between a battery module of the battery pack and a water-cooling plate, the apparatus including:
the first thermal resistance determining module is used for determining a first thermal resistance value range of the heat conducting pad according to the preset severe working condition and the preset electric core standard of the current vehicle;
the second thermal resistance determining module is used for determining a second thermal resistance value range based on a preset safety factor and the first thermal resistance value range, wherein the preset safety factor is set according to the contact thermal resistance and the aging condition of the heat conducting pad;
and the heat conductivity coefficient determining module is used for determining the range of the heat conductivity coefficient based on a heat resistance calculation formula and the range of the second thermal resistance value.
In a third aspect, an embodiment provides an electronic device, including a memory and a processor, where the memory stores a computer program operable on the processor, and the processor implements the steps of the method described in any one of the foregoing embodiments when executing the computer program.
In a fourth aspect, embodiments provide a machine-readable storage medium having stored thereon machine-executable instructions that, when invoked and executed by a processor, cause the processor to carry out the steps of the method of any preceding embodiment.
According to the method and the device for determining the coefficient of the heat conducting pad of the battery pack and the electronic equipment, the first thermal resistance value range of the heat conducting pad which can meet the preset severe working condition and the standard which should be met by the battery pack core is determined, on the basis, through research of the inventor, in order to further guarantee the application reliability of the battery pack, the second thermal resistance value range is defined by combining the preset safety coefficient related to the aging condition of the heat conducting pad, the target thermal resistance calculated based on the thermal resistance value calculation formula needs to meet the second thermal resistance value range, the thermal conductivity coefficient range is determined through inequality transformation, and the heat conducting pad determined according to the thermal conductivity coefficient range can save the cost on the basis of meeting the driving safety of vehicles.
Additional features and advantages of the disclosure will be set forth in the description which follows, or in part may be learned by the practice of the above-described techniques of the disclosure, or may be learned by practice of the disclosure.
In order to make the aforementioned objects, features and advantages of the present disclosure more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a flowchart of a method for determining a coefficient of a thermal pad 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 invention;
fig. 3 is a schematic cross-sectional view of a chip heat-conducting structure according to an embodiment of the present invention;
fig. 4 is a functional block diagram of an apparatus for determining a thermal pad coefficient 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
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to guarantee the driving safety of vehicle at present, often choose the better battery package of heat dispersion and heat conduction structure for use to make under the comparatively abominable operating mode condition of vehicle, also can guarantee the safety in application of battery package and vehicle. However, the battery pack with better heat dissipation performance and the heat conduction structure are higher in cost, and in order to guarantee driving safety, expensive devices are selected, so that the battery pack with better heat dissipation performance and the heat conduction structure are low in cost and not easy to widely apply.
Based on this, the method for determining the coefficient of the heat conducting pad of the battery pack provided by the embodiment of the invention determines the heat conducting coefficient of the optimal heat conducting pad which can meet the current vehicle safety, so that the battery pack can adapt to a severe working condition without causing excessive increase of cost.
For the convenience of understanding the present embodiment, a detailed description will be given to a method for determining a coefficient of a thermal pad of a battery pack according to an embodiment of the present invention, which is applicable to a controller, an intelligent device, a server, and the like.
Fig. 1 is a flowchart of a method for determining a coefficient of a thermal pad 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 value range of the heat conducting pad according to the preset severe working condition and the preset electric core standard of the current vehicle.
The preset severe working condition can be the worst working condition of the vehicle, which is 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 battery cell standard is a standard which is required to be met by a battery cell specified by the industry. 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 thermal conductivity of the heat conducting pad is obtained according to the determination of the resistance range of the thermal resistance, so that the battery pack composed of the heat conducting pad, the battery module and the water cooling plate under the target thermal conductivity can adapt to the severe working conditions of the vehicle, and the driving safety of the vehicle is ensured.
And step S104, determining a second thermal resistance value range based on a preset safety factor and the first thermal resistance value range, wherein the preset safety factor is used for reducing and improving error influence caused by thermal contact resistance and aging of the heat conducting pad, and the preset safety factor is set according to the thermal contact resistance and the aging of the heat conducting pad.
It should be noted that, as a result of the research by the inventors, when the thermal pad itself is aged, its own thermal conductivity is changed. The preset safety coefficient refers to that the thermal contact resistance and the aging condition of the heat conducting pad are checked in advance, and a safety coefficient is correspondingly set, so that the current thermal contact resistance and the aging 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 value range is more accurate than the first thermal resistance value range.
And S106, determining a thermal conductivity coefficient range based on the thermal resistance calculation formula and the second thermal resistance value 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 the preferred embodiment of practical application, through the comparatively abominable operating mode of presetting and the standard that the battery package electricity core should satisfy, confirm the first thermal resistance value scope of the heat conduction pad that can satisfy this operating mode and standard, on this basis, through the research of the inventor, in order to further ensure the reliability that the battery package was used, the factor of safety that the condition of heat conduction pad ageing condition was predetermine is combined again, inject the second thermal resistance value scope, the target thermal resistance that calculates based on the thermal resistance value calculation formula needs to satisfy the second thermal resistance value scope, through inequality transformation, confirm the coefficient of heat conductivity scope, the heat conduction pad that confirms according to this coefficient of heat conductivity scope, can be on the basis of satisfying vehicle driving safety, save cost.
In some embodiments, the thermal resistance value range of the thermal pad may be limited, so that the thermal pad meeting the thermal resistance value range can meet the severe working conditions in the driving process, and the thermal pad has reliability. As an example, the step S102 may include the following steps:
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 battery core standard of the battery pack.
Wherein, for the reliability of guaranteeing electric core, the industry has predetermine electric core standard, based on this predetermine electric core standard, exemplarily, can determine that the first highest allowable temperature m of the electric core of battery module and the second highest allowable temperature of liquid cooling board are n.
And 1.2) determining the total heat productivity of the battery module according to the preset severe working condition of the current vehicle.
Exemplarily, the worst possible working condition of the vehicle is determined according to the current frequent running environment of the vehicle, and the total heat productivity of a single module is calculated to be phi on the basis, specifically, I2R × n. Wherein, I is the current value, and R is the electric core resistance, and n is the quantity of electric core in the module. The heating value of each battery module is obtained through the method, and then the total heating value of the battery modules is obtained.
And 1.3) calculating a first thermal resistance value range of the heat conducting pad based on the total heat productivity and the heat exchange temperature difference, wherein the heat exchange temperature difference is the difference between the first highest allowable temperature and the second highest allowable temperature.
It should be noted that, the heat exchange temperature difference Δ T may be determined according to a first maximum allowable temperature m of the module and a second maximum allowable temperature n of the water-cooling plate, and specifically, Δ T ═ m-n.
Based on the step 1.3), the thermal resistance value range of the heat conducting pad can be determined through the total heat productivity and the heat exchange temperature difference, so that the heat conducting 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 following steps:
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 value range of the heat conducting pad based on the ratio, wherein the first thermal resistance value does not exceed the ratio.
Illustratively, by RtCalculating a first thermal resistance value R of the thermal resistance theoretical value of the thermal pad less than or equal to delta T/phitAs an example, RtAnd 0.05K/W can be selected.
In some embodiments, the range of thermal resistance values may be defined such that aging of the thermal pad and contact resistance does not affect the selection of the type of thermal pad. As an example, the step S104 may include the steps of:
and 2.1) determining a second thermal resistance value range based on the first thermal resistance value range divided by a preset safety factor.
In the 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 optional embodiment, a safety factor of 1.2 times is considered for the thermal resistance, that is, the second thermal resistance value is not more than 0.05/1.2 and is 0.04.
In some embodiments, the thermal conductivity range may be determined such that the type of the thermal pad implementing the thermal conductivity is selected to ensure the safety of the battery pack to which the thermal pad of the type is applied. As an example, the step S106 may include the following steps:
step 3.1), obtaining a thermal resistance calculation formula, and calculating a target thermal resistance, wherein the specific steps are as follows:
Figure BDA0003270459490000081
the target thermal resistance can be obtained according to the compressed thickness of the heat conducting pad and the ratio of the product of the effective heat exchange area of the heat conducting pad and 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 safe use, the target thermal resistance obtained by the thermal resistance calculation formula also needs to satisfy a second thermal resistance value range, and further, the thermal conductivity coefficient range can be determined through the transformation of the thermal conversion resistance formula, and the heat conduction pad type selection can be 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 step, and is transformed by the left and right sides of the inequality, and the thermal conductivity calculation formula is as follows:
Figure BDA0003270459490000082
wherein the second thermal resistance range is 0.04.
In some embodiments, the thermal conductivity may be verified before the thermal conductivity is selected according to the thermal conductivity range, so as to ensure the accuracy of 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 heat conductivity coefficient which can meet the heat conductivity coefficient range can theoretically meet the application requirements and the industrial standards of severe working conditions of vehicles, as an optional embodiment, the minimum heat conductivity coefficient which can meet the requirements can be preset and selected as a target heat conductivity coefficient, and the cost of the heat conducting pad which is subjected to model selection according to the target heat conductivity coefficient is low.
And 4.2) if the heat conducting pad configured with the target heat conductivity coefficient meets the target working condition requirement of the current vehicle, the verification is passed.
And carrying out verification by bringing the target heat conductivity coefficient into the simulation model, and judging whether the heat conducting pad with the target heat conductivity coefficient can meet other required working conditions of the current vehicle. If yes, the verification is passed; if not, the verification is not passed, the steps of the embodiment are repeated, a new target thermal conductivity coefficient is calculated again, and the verification is carried out again until the verification is passed.
As another alternative embodiment, different composition materials exist in the heat conduction pad, and the heat conduction pad layer of each material can be subjected to corresponding geometric modeling so as to ensure the verification accuracy; for example, if the thermal pad is made of multiple layers of materials, multiple layers of geometric modeling are required, and different layers are endowed with corresponding thermal conductivity coefficients; when parameters are given to the heat conducting pad, the heat conductivity coefficient of the heat conducting pad after aging is also considered, namely, the thermal performance of the heat conducting pad after aging is required to meet the requirement that the cell temperature does not exceed the standard.
In the simulation model, whether the heat productivity exceeds a standard or not is judged by calculating the heat productivity of the electric core of the heat conducting cushion layer with the assembling target heat conductivity coefficient so as to verify whether the selection type of the heat conducting cushion layer is qualified or not. It should be noted that, at the same time, the influence of the increase in the cell interior in the end EOL stage of the project, which results in the increase in the heat generation amount of the battery, needs to be considered. Illustratively, in the simulation process, the maximum temperature of the battery cell is monitored in real time in the whole process to meet TMonitoring temperature≤TAllowable temperature(ii) a If not, whether the target thermal conductivity is reasonable under the assumption of severe working conditions and thermal resistance is reconsidered.
In some embodiments, the heat conducting pad can be selected according to the target heat conductivity coefficient, so that the battery pack and the vehicle provided with the heat conducting pad of the target type have high reliability during driving. As an example, the above steps may further include the steps of:
and 5.1) if the target heat conductivity coefficient is verified, assembling the battery pack based on the heat conducting pad with the target heat conductivity coefficient.
In some embodiments, the thermal pad that is selected according to the target thermal conductivity may be assembled into a whole battery pack, and the battery pack may be verified mechanically or manually to determine whether the required condition can meet the requirement.
According to the embodiment of the invention, firstly, according to the worst working condition of the electric automobile, under the condition of meeting the requirement of the reliability of the battery core, the theoretical value of the thermal resistance of the thermal pad is estimated, then after the safety coefficient of 1.2 times of the thermal resistance is considered, the thermal conductivity (value range) is determined through a thermal-to-thermal-exchange-resistance formula, then, the determined thermal conductivity is input into a simulation model for verification, whether the thermal conductivity can meet other required working conditions of the vehicle or not is judged, and finally, the thermal pad corresponding to the determined thermal conductivity, the battery core and the cold plate are assembled into the vehicle for actual operation verification. The heat conduction pad with the determined heat conduction coefficient is ensured to be suitable, the normal operation of the vehicle can be ensured, and the cost of the heat conduction pad is saved. Although the higher the thermal conductivity of the thermal pad is, the better the heat dissipation performance is, the cost will be increased correspondingly, so the thermal pad with the appropriate thermal conductivity needs to be selected, which can meet the heat dissipation requirement and will not cause the cost increase.
On the basis of the foregoing embodiment, the method for determining the coefficient of the heat conducting pad of the battery pack according to the embodiment of the present invention may also be applied to the selection of the coefficient of heat conductivity of the heat conducting structure adhesive, as shown in fig. 3, where the heat of the chip is transferred to the heat conducting boss through the heat conducting adhesive, then transferred to the heat conducting structure adhesive, and finally transferred to the water cooling plate. Wherein, the heat conducting glue, the heat conducting boss and the heat conducting structural glue form a heat resistance Rt.
Firstly, screening out 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 participating in the calculation of the heat conductivity coefficient is less than or equal to 120 ℃; the maximum heat generation amount Φ of the chip is 19.8W, and the chip area a is 0.000625m2(ii) a The maximum temperature of the water-cooled plate is 55 ℃.
The calculation formula of the thermal resistance is as follows: rt＝△T/Φ；
Wherein R istCalculating the thermal resistance R, wherein the thermal resistance (unit ℃/W) on the whole path is calculated, delta T is the heat exchange temperature difference between a water cooling plate and the chip, 120-55 is 65 ℃, phi is the calorific value of the chip and is 19.8WtThe theoretical value is that Δ T/Φ is 65 ℃/19.8W is 3.28 ℃/W, that is, the theoretical value that the thermal resistance can bear under the action of the chip model 1 with the largest heat dissipation demand can be known.
And determining the heat conductivity coefficient of the heat-conducting structural adhesive based on the theoretical value of the thermal resistance so as to meet the standard.
Calculating a formula R & ltdelta & gt/(A & ltlambda & gt) according to thermal resistance, 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 pasting area of the heat-conducting glue is limited, the actual pasting area is only 70% of the theoretical value, namely the heat transfer area A is selected to be 0.7.
Rt＝RHeat-conducting glue+RHeat conduction boss+RHeat-conducting structural adhesive≤3.28℃/W
＝1/A*(δHeat-conducting glue/λHeat-conducting glue+δHeat conduction boss/λHeat conduction boss+δHeat-conducting structural adhesive/λHeat-conducting structural adhesive)≤3.28℃/W
＝1/(0.7×0.000625)×(0.001/3.6+0.008/96+0.0007/λHeat-conducting structural adhesive)≤3.28℃/W
Then calculate λHeat-conducting structural adhesiveThe heat conduction structural adhesive has the lowest heat conduction coefficient of 0.88W/m.multidot.K and the whole value of 1W/m.multidot.K, and is not less than 0.73W/m.multidot.K, and simultaneously the design margin with the safety coefficient of 1.2 is considered.
Therefore, based on the screened chip model 1 with the largest heat dissipation demand, the heat conductivity coefficient of the heat-conducting structural adhesive is determined to be larger than or equal to 1W/m.K, and the measured value is not lower than 0.9W/m.K, so that the heat conductivity coefficient can meet the heat dissipation demand of chips of any model, and further the model selection of the heat-conducting structural adhesive is realized.
As shown in fig. 4, an embodiment of the present invention further provides an apparatus 400 for determining a coefficient of a thermal pad of a battery pack, the apparatus including:
the first thermal resistance determining module 401 determines a first thermal resistance value range of the thermal pad according to a preset severe working condition and a preset electric core standard of a current vehicle;
a second thermal resistance determining module 402, configured to determine a second thermal resistance value range based on a preset safety factor and the first thermal resistance value range, where the preset safety factor is set according to a thermal contact resistance and an aging condition of the thermal pad;
the thermal conductivity determining module 403 determines a thermal conductivity range based on a thermal resistance calculation formula and the second thermal resistance value range.
In the practical application process, the thermal resistance value range of the battery pack heat conducting pad can be limited based on the preset severe working condition, the industry standard and the like of the current vehicle, the coefficient range of the heat conducting pad which can meet the public and industry standards is determined through the inequality relation between the thermal resistance calculation formula and the thermal resistance range, the target coefficient is determined based on the range, the type selection of the heat conducting pad is realized, and the cost is saved on the basis of the driving safety of the vehicle.
In some embodiments, the first thermal resistance determining module 401 is further specifically configured to determine a first maximum allowable temperature of the battery module and a second maximum allowable temperature of the liquid cooling plate according to a preset electric core standard of the battery pack; determining the total heat productivity 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 heat productivity and the 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 to the total heat generation amount; a first thermal resistance value range of the thermal pad is defined based on the ratio, wherein the first thermal resistance value does not exceed the ratio.
In some embodiments, the second thermal resistance determination module 402 further determines the second thermal resistance value range based on dividing the first thermal resistance value range 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 as follows:
Figure BDA0003270459490000121
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 satisfying the thermal conductivity range into the simulation model for verification; and if the heat conducting pad configured with the target heat conductivity coefficient meets the target working condition requirement of the current vehicle, the verification is passed.
In some embodiments, the apparatus further comprises an assembly control module configured to assemble the battery pack based on the thermal pad of the target thermal conductivity if the target thermal conductivity is verified.
Fig. 5 is a hardware architecture diagram 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 further include a non-volatile storage medium 503, a communication interface 504, and a bus 505; the machine-readable storage medium 501, the processor 502, the non-volatile storage medium 503, and the communication interface 504 are in communication with each other via a bus 505. The processor 502 may perform the method of determining the thermal pad coefficient of the battery pack as described in the above embodiments by reading and executing machine-executable instructions of the determination of the thermal pad coefficient of the battery pack in the machine-readable storage medium 501.
A machine-readable storage medium as 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, and the like. For example, the machine-readable storage medium may be: a RAM (random access Memory), a volatile Memory, a non-volatile Memory, a flash Memory, a storage drive (e.g., a hard drive), any type of storage disk (e.g., an optical disk, a dvd, etc.), or similar storage medium, or a combination thereof.
The non-volatile medium may be non-volatile memory, flash memory, a storage drive (e.g., a hard drive), any type of storage disk (e.g., an optical disk, dvd, etc.), or similar non-volatile storage medium, or a combination thereof.
It can be understood that, for the specific operation method of each functional module in this embodiment, reference may be made to the detailed description of the corresponding step in the foregoing method embodiment, and no repeated description is provided herein.
The computer-readable storage medium provided in the embodiments of the present invention stores a computer program, and when the computer program code is executed, the method for determining a coefficient of a thermal pad of a battery pack according to any of the embodiments described above may be implemented, and details thereof are not repeated herein.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the system and the apparatus described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In addition, in the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular 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-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein.

Claims (10)

1. A method for determining coefficients of a heat conducting pad of a battery pack is characterized in that the heat conducting pad is arranged between a battery module and a water cooling plate of the battery pack, and the method comprises the following steps:
determining a first thermal resistance value range of the heat conducting pad according to the preset severe working condition and the preset electric core standard of the current vehicle;
determining a second thermal resistance value range based on a preset safety factor and the first thermal resistance value range, wherein the preset safety factor is used for reducing error influence caused by thermal contact resistance and aging of the heat conducting pad;
and determining a thermal conductivity range based on a thermal resistance calculation formula and the second thermal resistance value range.
2. The method of claim 1, wherein the step of determining the first thermal resistance value range of the thermal pad according to the preset harsh condition and the preset cell standard of the current vehicle comprises:
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 core standard of the battery pack;
determining the total heat productivity 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 heat productivity and the 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.
3. The method of claim 2, wherein the step of calculating a first thermal resistance value range for the thermal pad based on the total heat generation and the heat exchange temperature differential comprises:
calculating the ratio of the heat exchange temperature difference to the total heating value;
a first thermal resistance value range of the thermal pad is defined based on the ratio, wherein the first thermal resistance value does not exceed the ratio.
4. The method of claim 1, wherein the step of determining a second range of thermal resistance values based on a preset safety factor and the first range of thermal resistance values comprises:
and determining a second thermal resistance value range based on the first thermal resistance value range divided by a preset safety factor.
5. The method of claim 3, wherein the step of determining a range of thermal conductivity values based on a thermal resistance calculation formula and the second range of thermal resistance values comprises:
obtaining a thermal resistance calculation formula and calculating a target thermal resistance, wherein the thermal resistance calculation formula is specifically as follows:
Figure FDA0003270459480000021
and limiting the target thermal resistance based on the second thermal resistance value range, and determining a thermal conductivity coefficient range.
6. The method of claim 5, further comprising:
inputting the target heat conductivity coefficient meeting the heat conductivity coefficient range into a simulation model for verification;
and if the heat conducting pad configured with the target heat conductivity coefficient meets the target working condition requirement of the current vehicle, the verification is passed.
7. The method of claim 6, further comprising:
and if the target heat conductivity coefficient passes the verification, assembling the battery pack based on the heat conducting pad with the target heat conductivity coefficient.
8. The utility model provides a confirming device of battery package heat conduction pad coefficient which characterized in that, the heat conduction pad sets up between the battery module and the water-cooling board of battery package, the device includes:
the first thermal resistance determining module is used for determining a first thermal resistance value range of the heat conducting pad according to the preset severe working condition and the preset electric core standard of the current vehicle;
the second thermal resistance determining module is used for determining a second thermal resistance value range based on a preset safety factor and the first thermal resistance value range, wherein the preset safety factor is set according to the contact thermal resistance and the aging condition of the heat conducting pad;
and the heat conductivity coefficient determining module is used for determining the range of the heat conductivity coefficient based on a heat resistance calculation formula and the range of the second thermal resistance value.
9. An electronic device comprising a memory and a processor, wherein the memory stores a computer program operable on the processor, and wherein the processor implements the steps of the method of any of claims 1 to 7 when executing the computer program.
10. A machine-readable storage medium having stored thereon machine-executable instructions which, when invoked and executed by a processor, cause the processor to carry out the steps of the method of any one of claims 1 to 7.
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