CN113030170A - Method and device for testing specific heat capacity of battery - Google Patents
Method and device for testing specific heat capacity of battery Download PDFInfo
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- CN113030170A CN113030170A CN202110316599.XA CN202110316599A CN113030170A CN 113030170 A CN113030170 A CN 113030170A CN 202110316599 A CN202110316599 A CN 202110316599A CN 113030170 A CN113030170 A CN 113030170A
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- 238000012360 testing method Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000010438 heat treatment Methods 0.000 claims abstract description 38
- 238000010998 test method Methods 0.000 claims abstract description 10
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical group [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 claims description 16
- 229910001416 lithium ion Inorganic materials 0.000 claims description 16
- 238000001514 detection method Methods 0.000 abstract description 2
- 238000009529 body temperature measurement Methods 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 239000012496 blank sample Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
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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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Abstract
The invention is suitable for the technical field of battery detection, and provides a method and a device for testing the specific heat capacity of a battery, wherein the method comprises the following steps: placing a battery to be tested in temperature control equipment, keeping the temperature of the temperature control equipment at a preset first temperature until a thermal equilibrium power curve of the temperature control equipment does not change, and taking the power of the temperature control equipment at the moment as a baseline power; the temperature of the temperature control equipment is raised to a preset second temperature, and when the temperature control equipment reaches the thermal equilibrium again and returns to the baseline power, a relation curve between the heating power change value and the time of the process temperature control equipment is obtained; and obtaining the specific heat capacity of the battery to be tested according to the relation curve of the heating power change value of the temperature control equipment and time. The test method for measuring the specific heat capacity of the battery provided by the embodiment of the invention is used for testing the specific heat capacity of the battery by carrying out power feedback on the temperature change of the battery, and the calculation is simpler and more intuitive.
Description
Technical Field
The invention belongs to the technical field of battery detection, and particularly relates to a method and a device for testing the specific heat capacity of a battery.
Background
Lithium ion batteries, which generally use a material containing lithium as an electrode, are representative of modern high-performance batteries. Because the lithium ion battery is easy to cause safety problems due to thermal runaway, the battery thermal management is a vital means for ensuring the safe use of the lithium ion battery.
The lithium ion battery is used for heat management, the temperature of the battery needs to be monitored, the temperature rise speed of the battery needs to be controlled, the specific heat capacity of the lithium ion battery determines the temperature rise and the temperature rise speed of the lithium ion battery under various charging and discharging working conditions, and the lithium ion battery is a relation thermal parameter for heat management of the battery.
However, the conventional method for testing the specific heat capacity of the battery is obtained by testing the change relation between the time and the temperature of the battery, and has the problems of complex test, non-intuition and the like.
Disclosure of Invention
The embodiment of the invention aims to provide a method for testing the specific heat capacity of a battery, and aims to solve the problems in the background art.
The embodiment of the invention is realized by the method, the battery to be tested is placed in the temperature control equipment, the temperature of the temperature control equipment is kept at the preset first temperature until the thermal equilibrium power curve of the temperature control equipment does not change, and the power of the temperature control equipment at the moment is taken as the baseline power;
the temperature of the temperature control equipment is raised to a preset second temperature, and when the temperature control equipment reaches the thermal equilibrium again and returns to the baseline power, a relation curve between the heating power change value and the time of the process temperature control equipment is obtained;
and obtaining the specific heat capacity of the battery to be tested according to the relation curve of the heating power change value of the temperature control equipment and time.
As a preferred scheme of the embodiment of the present invention, the step of obtaining the specific heat capacity of the battery to be tested according to a relationship curve between a heating power variation value of the temperature control device and time specifically includes:
obtaining the heat change value of the battery to be tested according to the relation curve of the heating power change value of the temperature control equipment and time;
and obtaining the specific heat capacity of the battery to be tested according to the heat change value of the battery to be tested.
As another preferable scheme of the embodiment of the present invention, the step of calculating the specific heat capacity of the battery to be tested according to the heat variation value of the battery to be tested specifically includes:
and calculating to obtain the specific heat capacity of the battery to be tested according to the heat change value of the battery to be tested and the mass of the battery to be tested.
As another preferred scheme of the embodiment of the present invention, the step of obtaining the heat variation value of the battery to be tested according to the relationship curve between the heating power variation value of the temperature control device and time specifically includes:
and calculating the heat change value of the battery to be tested by an integral test method according to the relation curve of the heating power change value of the temperature control equipment and time.
As another preferable aspect of the embodiment of the present invention, the battery is a lithium ion battery.
Another object of an embodiment of the present invention is to provide a device for testing a specific heat capacity of a battery, including:
the temperature control equipment is used for placing a battery to be tested and can realize temperature control by adjusting heating power;
the base line power determining module is used for determining the base line power of the temperature control equipment; the baseline power is the power of the temperature control equipment when the temperature of the temperature control equipment is kept at a preset first temperature until a thermal equilibrium power curve of the temperature control equipment is not changed;
the power curve acquisition module is used for acquiring a relation curve between the heating power change value and time of the process temperature control equipment when the temperature of the temperature control equipment rises to a preset second temperature and the temperature of the process temperature control equipment reaches thermal equilibrium again and returns to the baseline power;
and the specific heat capacity acquisition module is used for acquiring the specific heat capacity of the battery to be tested according to the relation curve of the heating power change value of the temperature control equipment and time.
As another preferable aspect of the embodiment of the present invention, the specific heat capacity obtaining module includes:
the heat change value calculating unit is used for obtaining the heat change value of the battery to be tested according to the relation curve of the heating power change value of the temperature control equipment and time;
and the specific heat capacity calculating unit is used for obtaining the specific heat capacity of the battery to be tested according to the heat change value of the battery to be tested.
As another preferable scheme of the embodiment of the present invention, the specific heat capacity calculation unit is configured to calculate the specific heat capacity of the battery to be tested according to the heat variation value of the battery to be tested and the mass of the battery to be tested.
As another preferred solution of the embodiment of the present invention, the heat variation value calculating unit is configured to calculate the heat variation value of the battery to be tested by an integral testing method according to a relation curve between the heating power variation value of the temperature control device and time.
As another preferable aspect of the embodiment of the present invention, the battery is a lithium ion battery.
According to the method for testing the specific heat capacity of the battery, provided by the embodiment of the invention, the specific heat capacity of the battery is tested by carrying out power feedback on the temperature change of the battery, and the calculation is simpler and more intuitive.
Drawings
Fig. 1 is a comparison graph of time (Ti me) -Power (Power) -Temperature (Temperature) obtained by the test method for testing the specific heat capacity of the battery according to the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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 one embodiment of the invention, a method for testing the specific heat capacity of a battery is provided, which comprises the following steps:
s1, placing the battery to be tested in a temperature control device, keeping the temperature of the temperature control device at a preset first temperature until a thermal balance power curve of the temperature control device does not change, and taking the power of the temperature control device at the moment as a baseline power;
s2, raising the temperature of the temperature control equipment to a preset second temperature, and obtaining a relation curve between the heating power change value and the time of the process temperature control equipment when the temperature control equipment reaches the thermal balance again and returns to the baseline power;
and S3, obtaining the specific heat capacity of the battery to be tested according to the relation curve of the heating power change value of the temperature control equipment and time.
In practical application, the test method can test the specific heat capacity through a set of power feedback equipment which can realize power feedback on the temperature change of the battery. Specifically, the set of power feedback equipment mainly comprises a temperature control system and a temperature measurement system, wherein the temperature control system can realize temperature control by adjusting the power of an internal heater, and can dynamically transmit the real-time adjusted power to computer control software and record a relation curve between the power variation and time; the temperature measurement system mainly realizes the measurement of the surface temperature of the battery to be measured.
In addition, the preset first temperature can be preset according to the actual situation, for example, the first temperature can be set to be 23-27 ℃; the preset second temperature can also be preset according to the actual situation, and generally, the preset second temperature is 1-3 ℃ higher than the preset first temperature, but is not limited thereto.
In a preferred embodiment of the present invention, the step of obtaining the specific heat capacity of the battery to be tested according to a relationship curve between a heating power variation value of the temperature control device and time specifically includes:
obtaining the heat change value of the battery to be tested according to the relation curve of the heating power change value of the temperature control equipment and time;
and obtaining the specific heat capacity of the battery to be tested according to the heat change value of the battery to be tested.
Specifically, the heat variation value of the battery to be tested can be calculated by an integral testing method according to a relation curve of the heating power variation value of the temperature control device and time.
Specifically, the specific heat capacity Cp of the battery to be tested may be calculated to be Δ Q/m according to the heat variation value Δ Q of the battery to be tested and the mass m of the battery to be tested.
In a preferred embodiment of the invention, the battery is a lithium ion battery.
Specifically, the test method can be used for testing the specific heat capacity of the lithium ion battery.
In another embodiment of the present invention, there is also provided a device for testing a specific heat capacity of a battery, including:
the temperature control equipment is used for placing a battery to be tested and can realize temperature control by adjusting heating power;
the base line power determining module is used for determining the base line power of the temperature control equipment; the baseline power is the power of the temperature control equipment when the temperature of the temperature control equipment is kept at a preset first temperature until a thermal equilibrium power curve of the temperature control equipment is not changed;
the power curve acquisition module is used for acquiring a relation curve between the heating power change value and time of the process temperature control equipment when the temperature of the temperature control equipment rises to a preset second temperature and the temperature of the process temperature control equipment reaches thermal equilibrium again and returns to the baseline power;
and the specific heat capacity acquisition module is used for acquiring the specific heat capacity of the battery to be tested according to the relation curve of the heating power change value of the temperature control equipment and time.
Wherein, the temperature control equipment is provided with a heater and a heating power feedback module, and the heater can select the existing electric heating wire or infrared heater, etc.; the testing device can also comprise temperature measuring equipment for measuring the surface temperature of the tested battery, and the temperature measuring equipment can adopt the existing common thermocouple or temperature sensor and the like.
Specifically, the specific heat capacity obtaining module includes:
the heat change value calculating unit is used for obtaining the heat change value of the battery to be tested according to the relation curve of the heating power change value of the temperature control equipment and time;
and the specific heat capacity calculating unit is used for obtaining the specific heat capacity of the battery to be tested according to the heat change value of the battery to be tested.
Specifically, the specific heat capacity calculation unit is used for calculating the specific heat capacity of the battery to be tested according to the heat change value of the battery to be tested and the mass of the battery to be tested.
Specifically, the heat change value calculation unit is configured to calculate the heat change value of the battery to be tested by an integral test method according to a relationship curve between the heating power change value of the temperature control device and time.
In one practical application example of the invention, the test method for measuring the specific heat capacity of the battery by using the test device comprises the following steps:
when the specific heat capacity is tested, the lithium ion battery with the mass m is installed on a temperature control device, the temperature control device keeps the initial temperature of 25 ℃ until the thermal equilibrium power curve does not change, and the power at the moment is the baseline power P0; then, the temperature of the temperature control equipment is changed to be 26 ℃, the heating power of a heater in the temperature control system is changed, after time delta t, the equipment reaches the thermal balance again and returns to the baseline power P0, and in the process, due to the change of the heating power of the heater, a relation curve delta P-t of the change of the heating power along with the time is recorded; then, when the Δ P-t curve in Δ t is integrated to obtain the heat variation value Δ Q of the lithium ion battery, the specific heat capacity Cp of the lithium ion battery becomes Δ Q/m. The specific heat capacity of the 18650Cell (18650Cell) and the blank (Empt Holder) was measured by this test method, and the obtained Time (Time) -power (Powe) -Temperature (Temperature) comparative graph is shown in fig. 1, and the obtained specific heat capacity results are shown in table 1. The 18650Cell curve in fig. 1 refers to the Time (Time) -Power (Power) relationship curve for a 18650 battery; the Empt Holder curve in fig. 1 refers to the Time (Time) -Power (Power) curve of the blank sample;
TABLE 1
In summary, the test method for measuring the specific heat capacity of the battery provided by the embodiment of the invention is used for testing the specific heat capacity of the battery by performing power feedback on the temperature change of the battery, and the calculation is simpler and more intuitive.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (10)
1. The method for testing the specific heat capacity of the battery is characterized by comprising the following steps of:
placing a battery to be tested in temperature control equipment, keeping the temperature of the temperature control equipment at a preset first temperature until a thermal equilibrium power curve of the temperature control equipment does not change, and taking the power of the temperature control equipment at the moment as a baseline power;
the temperature of the temperature control equipment is raised to a preset second temperature, and when the temperature control equipment reaches the thermal equilibrium again and returns to the baseline power, a relation curve between the heating power change value and the time of the process temperature control equipment is obtained;
and obtaining the specific heat capacity of the battery to be tested according to the relation curve of the heating power change value of the temperature control equipment and time.
2. The method for testing the specific heat capacity of the battery according to claim 1, wherein the step of obtaining the specific heat capacity of the battery to be tested according to a relation curve of a heating power change value of the temperature control device and time specifically comprises the following steps:
obtaining the heat change value of the battery to be tested according to the relation curve of the heating power change value of the temperature control equipment and time;
and obtaining the specific heat capacity of the battery to be tested according to the heat change value of the battery to be tested.
3. The method for testing the specific heat capacity of the battery according to claim 2, wherein the step of calculating the specific heat capacity of the battery to be tested according to the heat variation value of the battery to be tested specifically comprises:
and calculating to obtain the specific heat capacity of the battery to be tested according to the heat change value of the battery to be tested and the mass of the battery to be tested.
4. The method for testing the specific heat capacity of the battery according to claim 2, wherein the step of obtaining the heat change value of the battery to be tested according to the relation curve of the heating power change value of the temperature control device and time specifically comprises the following steps:
and calculating the heat change value of the battery to be tested by an integral test method according to the relation curve of the heating power change value of the temperature control equipment and time.
5. The method for testing the specific heat capacity of the battery according to any one of claims 1 to 4, wherein the battery is a lithium ion battery.
6. A device for testing the specific heat capacity of a battery is characterized by comprising:
the temperature control equipment is used for placing a battery to be tested and can realize temperature control by adjusting heating power;
the base line power determining module is used for determining the base line power of the temperature control equipment; the baseline power is the power of the temperature control equipment when the temperature of the temperature control equipment is kept at a preset first temperature until a thermal equilibrium power curve of the temperature control equipment is not changed;
the power curve acquisition module is used for acquiring a relation curve between the heating power change value and time of the process temperature control equipment when the temperature of the temperature control equipment rises to a preset second temperature and the temperature of the process temperature control equipment reaches thermal equilibrium again and returns to the baseline power;
and the specific heat capacity acquisition module is used for acquiring the specific heat capacity of the battery to be tested according to the relation curve of the heating power change value of the temperature control equipment and time.
7. The device for testing the specific heat capacity of the battery according to claim 6, wherein the specific heat capacity acquisition module comprises:
the heat change value calculating unit is used for obtaining the heat change value of the battery to be tested according to the relation curve of the heating power change value of the temperature control equipment and time;
and the specific heat capacity calculating unit is used for obtaining the specific heat capacity of the battery to be tested according to the heat change value of the battery to be tested.
8. The device for testing the specific heat capacity of the battery according to claim 7, wherein the specific heat capacity calculation unit is used for calculating the specific heat capacity of the battery to be tested according to the heat variation value of the battery to be tested and the mass of the battery to be tested.
9. The device for testing the specific heat capacity of the battery according to claim 7, wherein the root heat change value calculating unit is used for calculating the heat change value of the battery to be tested by an integral testing method according to a relation curve of the heating power change value of the temperature control equipment and time.
10. The device for testing the specific heat capacity of the battery according to any one of claims 6 to 9, wherein the battery is a lithium ion battery.
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Application publication date: 20210625 |