CN106872898B - Rapid testing method for thermal resistance of single interface of power battery - Google Patents
Rapid testing method for thermal resistance of single interface of power battery Download PDFInfo
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- CN106872898B CN106872898B CN201710065366.0A CN201710065366A CN106872898B CN 106872898 B CN106872898 B CN 106872898B CN 201710065366 A CN201710065366 A CN 201710065366A CN 106872898 B CN106872898 B CN 106872898B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
Abstract
The invention discloses a method for quickly testing the thermal resistance of a single interface of a power battery, which comprises the following steps: s10, placing the testing device in a constant temperature environment and suspending the testing device; s20, the heating unit emits heat and starts to heat the power battery monomer; s30, testing the temperatures of a point A and a point B by using a temperature measuring instrument, wherein the point A is the left central point of the heat conducting unit, and the point B is the right central point of the power battery monomer positioned on the right side; and S40, calculating the power consumption of the heating unit and the difference between the temperature at the point A and the temperature at the point B after the temperature at the point A and the temperature at the point B are stable, and calculating the interface thermal resistance according to the power consumption of the heating unit and the difference between the temperature at the point A and the temperature at the point B. The rapid testing method for the interface thermal resistance of the single power battery provided by the invention is simple, convenient and rapid. The interface thermal resistances of the battery monomers at different temperatures and different pressures, including the interface thermal resistances of the battery monomers in different service life states, can also be tested according to requirements.
Description
Technical Field
The invention relates to a method for testing a power battery monomer, in particular to a method for quickly testing the interface thermal resistance of the power battery monomer.
Background
With the development of new energy vehicles, the safety of power batteries is more and more focused. The safety problem of the power battery is mainly caused by thermal runaway, and therefore, the thermal management technology of the power battery is rapidly developed, and the research on the heat conduction of the power battery becomes a hot spot in recent times. The interface thermal resistance of the power battery is greatly influenced by processes and materials, occupies a large proportion in the heat conduction process of the power battery, and is increasingly important for how to quickly test the interface thermal resistance.
Most of the traditional interface thermal resistance test methods need relatively complex test instruments, and the test methods are also relatively complex. In the current research aiming at the heat conduction technology of the power battery, the interface thermal resistance is qualitatively reduced through the structure or material design, and no quantitative test method exists.
Disclosure of Invention
The invention aims to provide a method for quickly testing the interface thermal resistance of a power battery monomer, which is convenient and simple in operation process and can quantitatively give the numerical value of the interface thermal resistance.
The technical scheme adopted by the invention for solving the technical problems is as follows: a rapid test method for interface thermal resistance of a power battery monomer is characterized in that a test device is used for testing the interface thermal resistance of the power battery monomer, and the test device comprises a heating unit, a heat conduction unit and two identical power battery monomers; the heating unit is clamped between the two power battery monomers, the heat conducting unit covers the left surface of the power battery monomer on the left side, and the heating unit, the heat conducting unit and the center points of the two power battery monomers are superposed; the method comprises the following steps:
s10, placing the testing device in a constant temperature environment and suspending the testing device;
s20, the heating unit emits heat and starts to heat the power battery monomer;
s30, testing the temperatures of a point A and a point B by using a temperature measuring instrument, wherein the point A is the left central point of the heat conducting unit, and the point B is the right central point of the power battery monomer positioned on the right side;
and S40, calculating the power consumption of the heating unit and the difference between the temperature at the point A and the temperature at the point B after the temperature at the point A and the temperature at the point B are stable, and calculating the interface thermal resistance according to the power consumption of the heating unit and the difference between the temperature at the point A and the temperature at the point B.
Optionally, the testing apparatus further includes a voltage-stabilized power supply for supplying electric energy to the heating unit, and an ammeter for measuring a current value supplied from the voltage-stabilized power supply to the heating unit.
Optionally, in step S40, the interfacial thermal resistance is calculated by the following formula:
△ T/P (power consumption) -RGuide tube；
Wherein R represents interfacial thermal resistance in K/W, △ T represents the temperature difference between A and B in centigrade, P represents the power consumption in watt, and RGuide tubeRepresenting the interface thermal resistance of the heat conducting unit; wherein:
p is U I/2; wherein, U is the voltage of a stabilized voltage power supply, the unit is volt, I is the current passing through the ammeter, and the unit is ampere;
Rguide tube＝δ/(k*A)；
Wherein δ represents the thickness of the heat conducting unit in m; k represents a thermal conductivity coefficient of the heat conducting unit, and the unit is W/(m.K); a represents the area of the heat-conducting unit in m2。
Optionally, the heating unit is a silica gel heating sheet or a metal heating sheet, and the length and width of the heating unit are the same as those of the power battery monomer.
Optionally, the heat conducting unit is an aluminum sheet, and the central part of the heat conducting unit is tightly attached to the power battery monomer.
The invention has the following beneficial effects: the invention provides a rapid testing method for interface thermal resistance of a power battery monomer, which can provide a basis for performance evaluation of the power battery monomer. According to the measured values, the advantages and the disadvantages of different methods for reducing the interface thermal resistance can be evaluated. In addition, if the testing device is placed in the environment test box, and the pressure measuring device is added to measure the pressure between the heat conducting unit and the power battery monomer, the interface thermal resistance change conditions under different temperatures and different pressures can be obtained.
Drawings
FIG. 1 is a schematic diagram illustrating a method for rapidly testing interfacial thermal resistance of a power battery cell according to the present invention;
FIG. 2 is a schematic structural diagram of a testing apparatus according to the present invention;
the notation in the figures means: 1-power battery monomer; 3-a heat conducting unit; 4-a heat-generating unit; 41-silica gel heating plate; 42-stabilized power supply; 43-amperemeter.
Detailed Description
The technical solution of the present invention is further described below with reference to the following embodiments and the accompanying drawings.
Example 1
The embodiment provides a method for rapidly testing the interface thermal resistance of a single power battery, which uses a testing device to complete testing, wherein the testing device comprises a heating unit, a heat conducting unit and two identical single power batteries; the heating unit is clamped between the two power battery monomers, the heat conducting unit covers the left surface of the power battery monomer on the left side, and the heating unit, the heat conducting unit and the central points of the two power battery monomers are overlapped.
The method comprises the following steps:
s10, placing the testing device in a constant temperature environment and suspending the testing device; for example, the testing device can be placed in environments with different temperatures to achieve the interface thermal resistance of the power battery cells at different temperatures.
And S20, the heating unit emits heat to start heating the power battery monomer.
In this embodiment, when the heating unit operates, heat is transferred to the left through the left power battery cell and the heat conduction unit, and is dissipated to the right through the right power battery cell.
And S30, testing the temperatures of the point A and the point B by using a temperature measuring instrument.
In this embodiment, point a is a left center point of the heat conducting unit, and point B is a right center point of the power battery cell located on the right side.
And S40, calculating the power consumption of the heating unit and the difference between the temperature at the point A and the temperature at the point B after the temperature at the point A and the temperature at the point B are stable, and calculating the interface thermal resistance according to the power consumption of the heating unit and the difference between the temperature at the point A and the temperature at the point B.
Preferably, the power battery cell can be square or soft; for example, the power battery cell may be a soft package aluminum-plastic film cell, and the manufacturer, specification, and product state of the power battery cell are the same, and the heat conduction coefficients are substantially the same, so that the thermal resistance of heat conducted through the Z direction (thickness direction) of the power battery cell may be considered to be equal here.
The heating unit can be a silica gel heating sheet or a metal heating sheet, the length and width of the heating unit are the same as the size of the power battery monomer, and the thickness of the heating unit is smaller than the size of the battery and is as small as possible.
For example: the heating unit is the silica gel heating plate to adopt constant voltage power supply to the silica gel heating plate provides the electric energy, and adopt the galvanometer to measure constant voltage power supply to the current value that the silica gel heating plate provided, silica gel heating plate area is great, and heat distribution is more even. When the heating unit is heated, a stabilized voltage power supply is adopted for supplying power, and the power consumption of the heating unit is calculated according to the numerical value of the current meter.
The heat conduction unit can be selected according to the design requirements of an actual module, can be an aluminum sheet or other metal or non-metal materials, and the central part of the heat conduction unit is tightly attached to the power battery monomer. In this embodiment, the length and width dimensions of the heat conducting unit may be the same as or different from those of the power battery cell. For example, the heat conducting unit is a metal aluminum sheet and is in close contact with the power battery monomer to generate interface thermal resistance. Naturally radiating the heat at the outside room temperature.
When temperature measurement is carried out, the temperature measuring instrument respectively carries out temperature measurement on an upper point A (a power battery monomer positioned on the right side) and a point B (a heat conducting unit) through a thermocouple, reads a temperature value when the temperature is stable, and calculates interface thermal resistance according to temperature difference and power consumption.
Specifically, in step S40, the interfacial thermal resistance may be calculated by the following formula:
△ T/P (power consumption) -RGuide tube；
Wherein R represents interfacial thermal resistance in K/W, △ T represents the temperature difference between A and B in centigrade, P represents the power consumption in watt, and RGuide tubeRepresenting the interface thermal resistance of the heat conducting unit; wherein:
p is U I/2; wherein U is the voltage of the regulated power supply in volts, and I is the current through the ammeter in amps.
RGuide tube＝δ/(k*A)。
Wherein δ represents the thickness of the heat conducting unit in m; k represents a thermal conductivity coefficient of the heat conducting unit, and the unit is W/(m.K); a represents the area of the heat-conducting unit in m2。
The invention provides a rapid testing method for interface thermal resistance of a power battery monomer, which can provide a basis for performance evaluation of the power battery monomer. According to the measured values, the advantages and the disadvantages of different methods for reducing the interface thermal resistance can be evaluated. In addition, if the testing device is placed in the environment test box, and the pressure measuring device is added to measure the pressure between the heat conducting unit and the power battery monomer, the interface thermal resistance change conditions under different temperatures and different pressures can be obtained.
Therefore, the rapid testing method for the interface thermal resistance of the power battery monomer is simple, convenient and rapid. The interface thermal resistances of the battery monomers at different temperatures and different pressures, including the interface thermal resistances of the battery monomers in different service life states, can also be tested according to requirements.
The sequence of the above embodiments is only for convenience of description and does not represent the advantages and disadvantages of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (4)
1. A rapid test method for interface thermal resistance of a power battery monomer is characterized in that a test device is used for testing the interface thermal resistance of the power battery monomer, and the test device comprises a heating unit, a heat conduction unit and two identical power battery monomers; the heating unit is clamped between the two power battery monomers, the heat conducting unit covers the left surface of the power battery monomer on the left side, and the heating unit, the heat conducting unit and the center points of the two power battery monomers are superposed; characterized in that the method comprises the following steps:
s10, placing the testing device in a constant temperature environment and suspending the testing device;
s20, the heating unit emits heat and starts to heat the power battery monomer;
s30, testing the temperature of the point A and the temperature of the point B by using a temperature measuring instrument, wherein the point A is the left central point of the heat conducting unit, and the point B is the right central point of the power battery monomer positioned on the right side;
s40, when the temperature of the point A and the temperature of the point B are stable, calculating the power consumption of the heating unit and the difference value between the temperature of the point A and the temperature of the point B, and calculating the interface thermal resistance according to the power consumption of the heating unit and the difference value between the temperature of the point A and the temperature of the point B;
in step S40, the interfacial thermal resistance is calculated by the following formula:
R＝△T/P-Rguide tube；
Wherein R represents interfacial thermal resistance in K/W, △ T represents the temperature difference between A and B in centigrade, P represents the power consumption in watt, and RGuide tubeRepresenting the interface thermal resistance of the heat conducting unit; wherein:
p is U I/2; in the formula, U is the voltage of a voltage-stabilized power supply, the unit is volt, I is the current passing through an ammeter, and the unit is ampere;
Rguide tube＝δ/(k*A)；
Wherein δ represents the thickness of the heat conducting unit in m; k represents a thermal conductivity coefficient of the heat conducting unit, and the unit is W/(m.K); a represents the area of the heat-conducting unit in m2。
2. The method for rapidly testing the thermal interface resistance of the power battery cell as claimed in claim 1, wherein the testing device further comprises a voltage-stabilized power supply for supplying electric energy to the heating unit, and an ammeter for measuring the current value supplied by the voltage-stabilized power supply to the heating unit.
3. The method for rapidly testing the interfacial thermal resistance of the power battery monomer as claimed in claim 2, wherein the heating unit is a silica gel heating sheet or a metal heating sheet, and the length and width of the heating unit are the same as those of the power battery monomer.
4. The method for rapidly testing the interfacial thermal resistance of the power battery monomer as claimed in claim 3, wherein the heat conducting unit is an aluminum sheet, and the central part of the heat conducting unit is tightly attached to the power battery monomer.
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| KR20200144381A (en) * | 2019-06-18 | 2020-12-29 | 주식회사 엘지화학 | Apparatus and Method for Measuring Thermal Conductivity of Battery Cell |
| CN111044930B (en) * | 2019-12-06 | 2020-10-23 | 清华大学 | Method and system for testing heat transfer resistance of lithium ion battery module |
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| CN113189508B (en) * | 2021-05-03 | 2022-06-21 | 湖南城市学院 | Reverse calculation method and device for internal thermal resistance parameters of lithium ion soft package battery |
| CN113764747A (en) * | 2021-08-12 | 2021-12-07 | 岚图汽车科技有限公司 | Method and device for detecting thermal contact resistance of battery thermal management system |
| CN117148124B (en) * | 2023-11-01 | 2024-02-20 | 杭州高坤电子科技有限公司 | Integrated circuit thermal resistance testing method, system and storage medium |
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