CN117214232A - Method and device for measuring heat transfer coefficient of battery cell - Google Patents
Method and device for measuring heat transfer coefficient of battery cell Download PDFInfo
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- CN117214232A CN117214232A CN202311190471.9A CN202311190471A CN117214232A CN 117214232 A CN117214232 A CN 117214232A CN 202311190471 A CN202311190471 A CN 202311190471A CN 117214232 A CN117214232 A CN 117214232A
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- 238000012546 transfer Methods 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title claims abstract description 47
- 238000005259 measurement Methods 0.000 claims abstract description 21
- 239000004065 semiconductor Substances 0.000 claims description 54
- 238000007599 discharging Methods 0.000 claims description 31
- 239000000523 sample Substances 0.000 claims description 20
- 238000005057 refrigeration Methods 0.000 claims description 14
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- 229910001416 lithium ion Inorganic materials 0.000 claims description 6
- 239000012535 impurity Substances 0.000 claims description 5
- 230000000694 effects Effects 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 4
- 229920001410 Microfiber Polymers 0.000 claims description 3
- 229910052739 hydrogen Inorganic materials 0.000 claims description 3
- 239000001257 hydrogen Substances 0.000 claims description 3
- 229920000642 polymer Polymers 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 2
- 230000004907 flux Effects 0.000 claims description 2
- 230000002265 prevention Effects 0.000 claims 1
- 238000002474 experimental method Methods 0.000 abstract description 11
- 238000000691 measurement method Methods 0.000 abstract description 3
- 230000001276 controlling effect Effects 0.000 abstract 2
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 230000017525 heat dissipation Effects 0.000 description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The application provides a method and a device for measuring heat transfer coefficient of a battery cell, comprising the following steps: s1, setting an experimental environment, wherein the experimental environment is firstly set before the measurement of the heat transfer coefficient of the battery cell, and the method comprises the steps of determining a required temperature range and experimental conditions. Compared with other heat transfer coefficient measurement methods, the experiment based on temperature difference driving is generally a relatively quick method, and the heat transfer coefficient is estimated by controlling the temperature difference between the refrigerating sheet and the battery cell to reach a heat balance state quickly; compared with some more complex heat transfer experimental methods, the experimental cost based on temperature difference driving is relatively low, and the refrigerating sheet and the temperature sensor are common and relatively economical experimental equipment and are suitable for being used in a general laboratory; the temperature of the bottom surface of the battery cell can be accurately regulated by controlling the temperature of the refrigerating sheet, so that stable and controllable heat transfer conditions in the experimental process are ensured, and reliable measurement results are facilitated.
Description
Technical Field
The application relates to the technical field of cell heat transfer coefficient measurement, in particular to a method and a device for measuring cell heat transfer coefficients.
Background
Currently, with the continuous development of battery technology, various types of batteries are widely used in applications such as mobile devices, electric vehicles, energy storage systems, and the like. One of the key factors of battery performance is temperature management and heat dissipation, which directly relates to the heat transfer performance of the battery cell, the temperature distribution inside the battery cell has an important influence on the performance and service life of the battery, and uneven temperature distribution can cause hot spots, so that the performance and safety of the battery are reduced, and therefore, the understanding of the heat transfer behavior inside the battery cell is important;
the traditional measurement of the heat transfer coefficient of the battery cell is to cut the battery cell sample into a relatively thin sheet shape, clean the surface to remove dirt and impurities, and then use a heat flow instrument or a hot plate for measurement, but the measurement mode uses complicated and expensive equipment, and the measured data is a numerical heat transfer coefficient fitted to the whole battery cell and cannot be compared with the actual working condition;
therefore, a method and a device for measuring the heat transfer coefficient of the battery cell are provided.
Disclosure of Invention
In view of the above, the present application provides a method and apparatus for measuring a heat transfer coefficient of a battery cell, so as to solve or alleviate the technical problems in the prior art, and at least provide a beneficial choice.
The technical scheme of the application is realized as follows: a method for measuring heat transfer coefficient of a battery cell, comprising the steps of:
s1, setting an experimental environment, wherein the experimental environment is firstly set before the measurement of the heat transfer coefficient of the battery cell, and the method comprises the steps of determining a required temperature range and experimental conditions;
s2, preparing a battery cell, namely selecting a battery cell sample to be measured, and ensuring that the surface of the battery cell sample is clean and free of dirt and impurities;
s3, exposing the battery cell at high temperature, placing the battery cell sample in an incubator, raising the temperature to a target temperature, and standing for a period of time at the temperature;
s4, measuring the heating power of the battery cell, and measuring the heating power of the battery cell through a corresponding temperature sensor in a high-temperature environment;
s5, charging and discharging the battery cell, performing charging and discharging operation on the battery cell through charging and discharging equipment, simulating actual working conditions in a high-temperature environment, and adjusting the internal temperature and current of the battery cell by controlling the charging and discharging process;
s6, starting a refrigeration function on the semiconductor refrigeration piece by utilizing the low-voltage load device, and keeping the temperature of the refrigeration piece in a proper range;
s7, estimating the heat transfer coefficient by collecting the temperature of the current core and the sensor data.
Further preferably, in the step S1, firstly, the operating temperature range of the battery cell to be measured is determined, and the temperature of the experimental chamber is brought to the coverage range, then, the temperature sensor, the charge and discharge device and the semiconductor refrigeration sheet measuring and controlling device are calibrated, and secondly, necessary safety measures are taken according to the set temperature range and experimental conditions, including preventing safety risks under the conditions of high temperature and low pressure.
Further preferably, in the step S2, the type of the battery cell to be measured is determined, which includes any one of a lithium ion battery, a polymer lithium ion battery and a nickel hydrogen battery, and before the measurement, the clean microfiber cloth is used to wipe the outer surface of the battery cell to remove surface dirt, and ensure that the surface of the battery cell is completely dry.
Further preferably, in said S3, it is ensured that the incubator has been calibrated and prepared, the desired high temperature environment is reached, the fluctuation of the temperature within the desired range is kept to a minimum, the desired target temperature is selected, which temperature reflects the highest temperature reached by the cells in the actual operating conditions, the cleaned and prepared cell sample is placed in the incubator and air flow is allowed to evenly distribute the temperature, once the incubator reaches the target temperature, the cell sample is given sufficient time to stabilize, and the cells are allowed to stand at the target temperature to reach thermal equilibrium.
Further preferably, in the step S4, the temperature of the battery cell is measured by a temperature sensor, the temperature change of the battery cell is monitored in real time, the battery cell is charged and discharged by using a charging and discharging device in a high temperature environment, and the charge and discharge process of the battery cell under the actual working condition is simulated by controlling the current and the voltage, and in the process, the battery cell generates heat by charging and discharging.
Further preferably, in the step S5, the electric core is charged to a desired charge state by setting current and voltage parameters in the charging and discharging processes, heat is generated by a sufficient electrothermal effect, and after the charging is completed, the discharging process is started, and the electric core is discharged to the desired charge state, so that the temperature is maintained at the target temperature by discharging in a high-temperature environment.
Further preferably, in the step S6, a PID (proportional-integral-derivative) control system is configured by setting current and voltage parameters of the low-voltage load device to match with the semiconductor refrigeration sheet, the PID control system is connected to the semiconductor temperature sensor to monitor the temperature of the semiconductor refrigeration sheet, the position of the semiconductor temperature sensor corresponds to the hot surface of the semiconductor refrigeration sheet, the PID control system periodically reads the data of the semiconductor temperature sensor and compares the data with a set target temperature, and when the semiconductor temperature exceeds the set target temperature range, the PID control system automatically adjusts the current output to control the semiconductor temperature;
current control mode of PID control system:
the proportional control adjusts the current according to the actual temperature deviation, the processing temperature drifts through integral control, and the processing temperature change rate is controlled through differential control;
the PID control system will automatically adjust the current, correct the deviation and maintain a stable temperature when a temperature deviation is found.
Further preferably, in the step S7, by three temperature sensors disposed longitudinally in the cell, in a thermal equilibrium state, the heat flow is stabilized through the heat transfer medium (cell), that is, the heat inflow and the heat outflow are equal;
the heat transfer coefficient is calculated by the following formula:
q＝h*A*ΔT；
where q is the heat flux (in W), h is the heat transfer coefficient (in W/(m 2. K)), A is the heat transfer surface area (in m 2), and DeltaT is the heat conduction temperature difference (in K).
In addition, the application also provides a device for measuring the heat transfer coefficient of the battery cell, which comprises
The device comprises an incubator, two heat pipe radiators, two heat dissipation fans, a semiconductor refrigerating sheet, an electric core, a mounting plate and three temperature sensors;
the two heat pipe radiators and the two heat dissipation fans are arranged at intervals and installed at the inner bottoms of the temperature boxes, the semiconductor refrigerating sheets are installed at the middle parts of the temperature boxes and positioned at the tops of the two heat pipe radiators, the electric core is arranged at the upper parts of the semiconductor refrigerating sheets, the positive electrode and the negative electrode of the electric core are electrically connected with external charging and discharging equipment through electric wires, the semiconductor refrigerating sheet is electrically connected with an external low-voltage load device, the three temperature sensors are longitudinally arranged on one side of the mounting plate, which is positioned in the incubator, the three probes of the temperature sensors are longitudinally positioned on the outer side of the battery cell, and the mounting plate is fixedly arranged on the inner wall of the incubator.
By adopting the technical scheme, the embodiment of the application has the following advantages:
1. compared with other heat transfer coefficient measurement methods, the temperature difference driving-based experiment is generally a relatively quick method, and the heat transfer coefficient is estimated by controlling the temperature difference between the refrigerating sheet and the battery cell to reach a heat balance state quickly.
2. Compared with some more complex heat transfer experimental methods, the experimental cost based on temperature difference driving is relatively low, and the refrigerating sheet and the temperature sensor are common and relatively economical experimental equipment and are suitable for being used in a general laboratory.
3. The application can accurately adjust the temperature of the bottom surface of the battery cell by controlling the temperature of the refrigerating sheet, ensures stable and controllable heat transfer conditions in the experimental process, and is beneficial to obtaining a reliable measurement result.
4. The method for measuring the heat transfer coefficient based on the temperature difference can be used for various types of battery cores or other heat transfer samples, and can be applied to different practical problems and materials only by proper adjustment according to practical conditions.
5. Compared with a heat transfer measurement method requiring destructive operation, the method can nondestructively estimate the heat transfer coefficient through experiments driven by temperature differences, thereby maintaining the integrity and reusability of materials.
The foregoing summary is for the purpose of the specification only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of the present application will become apparent by reference to the drawings and the following detailed description.
Drawings
In order to more clearly illustrate the embodiments of the application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a block diagram of an apparatus for measuring heat transfer coefficients of a battery cell according to the present application;
FIG. 2 is a view of the interior of the incubator according to the present application;
FIG. 3 is a view showing another view of the interior of the incubator according to the present application.
Reference numerals: 10. a warm box; 20. a heat pipe radiator; 30. a heat radiation fan; 40. a semiconductor refrigeration sheet; 50. a battery cell; 60. a mounting plate; 70. a temperature sensor.
Detailed Description
Hereinafter, only certain exemplary embodiments are briefly described. As will be recognized by those of skill in the pertinent art, the described embodiments may be modified in various different ways without departing from the spirit or scope of the present application. Accordingly, the drawings and description are to be regarded as illustrative in nature and not as restrictive.
Embodiments of the present application will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1-3, an embodiment of the present application provides a method for measuring a heat transfer coefficient of a battery cell, including the following steps:
s1, setting an experimental environment, wherein the experimental environment is firstly set before the measurement of the heat transfer coefficient of the battery cell, and the method comprises the steps of determining a required temperature range and experimental conditions;
firstly, determining the working temperature range of a battery cell to be measured, enabling the temperature of an experiment room to reach the coverage range, calibrating a temperature sensor, a charging and discharging device and a semiconductor refrigerating sheet measuring and controlling device, and then adopting necessary safety measures according to the set temperature range and the experiment conditions, wherein the safety measures comprise preventing safety risks under the conditions of high temperature and low pressure;
the working temperature range of the battery core to be measured is determined to ensure that experiments can be carried out under actual working conditions, the temperature sensor, the charging and discharging equipment and the measuring and controlling equipment of the semiconductor refrigerating sheet are calibrated to ensure the accuracy of measurement and control, reliable data can be provided through accurate equipment, so that the reliability of experimental results is increased, necessary safety measures are taken to prevent safety risks in experiments, potential risks exist under high-temperature and low-pressure conditions, the laboratory and equipment are ensured to meet safety standards, and necessary preventive measures are taken to ensure the safety of experimental personnel and equipment.
S2, preparing a battery cell, namely selecting a battery cell sample to be measured, and ensuring that the surface of the battery cell sample is clean and free of dirt and impurities;
determining the type of a cell to be measured, wherein the type of the cell comprises any one of a lithium ion battery, a polymer lithium ion battery and a nickel-hydrogen battery, and cleaning the outer surface of the cell by using clean microfiber cloth to remove surface dirt and ensure that the surface of the cell is completely dried before measurement;
the dirt or impurities on the surface of the battery cell can influence the accuracy of heat transfer coefficient measurement, the dirt can form thermal resistance to influence the heat transfer efficiency, so that the influence of interference factors is reduced by wiping the surface of the battery cell, the measurement result is more accurate, the clean surface of the battery cell has better heat transfer performance, heat can be more effectively transferred, the heat can be uniformly transferred into the battery cell in the measurement process, more reliable heat transfer coefficient data can be obtained, the dirt can cause surface reflection, the heat cannot effectively enter the battery cell, the reflection effect can be reduced by ensuring the clean and dry surface of the battery cell, and the heat transfer efficiency is improved;
s3, exposing the battery cell at high temperature, placing the battery cell sample in an incubator, raising the temperature to a target temperature, and standing for a period of time at the temperature;
determining that the incubator has been calibrated and prepared to achieve a desired high temperature environment, maintaining minimal fluctuation in temperature within a desired range, selecting a desired target temperature that reflects the maximum temperature reached by the cell in actual operating conditions, placing a cleaned and prepared cell sample within the incubator and allowing air flow to evenly distribute the temperature, once the incubator reaches the target temperature, allowing the cell sample sufficient time to stabilize, and allowing the cell to stand at the target temperature to achieve thermal equilibrium;
the incubator must be calibrated to ensure that it is able to maintain the required high temperature environment with minimal temperature fluctuations, the target temperature is chosen to simulate the highest temperature reached by the cell under practical operating conditions in order to maintain stability of the experimental conditions, because the cell will be affected by the high temperature environment during operation, and therefore it is necessary to perform heat transfer coefficient measurements under high temperature conditions, place clean and ready cell samples in the incubator to ensure that they are exposed to the high temperature environment, let the cell warm up gradually at high temperature to prepare the heat transfer coefficient measurements, and give the cell sample enough time to rest at the target temperature to reach thermal equilibrium, in order to ensure that the cell is in a stable temperature state at the beginning of the experiment to obtain accurate heat transfer coefficient measurement data;
s4, measuring the heating power of the battery cell, and measuring the heating power of the battery cell through a corresponding temperature sensor in a high-temperature environment;
measuring the temperature of the battery cell through a temperature sensor, monitoring the temperature change of the battery cell in real time, performing charge and discharge operation on the battery cell in a high-temperature environment by using charge and discharge equipment, and simulating charge and discharge processes of the battery cell under actual working conditions by controlling current and voltage, wherein in the processes, the charge and discharge enable the battery cell to generate heat;
s5, charging and discharging the battery cell, performing charging and discharging operation on the battery cell through charging and discharging equipment, simulating actual working conditions in a high-temperature environment, and adjusting the internal temperature and current of the battery cell by controlling the charging and discharging process;
the battery charging process comprises the following steps:
the electric core is charged to a required charge state so as to simulate the charge state of the electric core under the actual working condition, ensure that the experimental condition is consistent with the actual application condition, and generate an electrothermal effect when charging current passes through the electric core to heat the electric core;
and (3) a cell discharging process:
the discharging process is to discharge the battery cell to a required charge state so as to complete a charging-discharging cycle, and discharge in a high-temperature environment to keep the temperature of the battery cell within a target temperature range, so that experimental measurement is ensured to be carried out under the high-temperature condition, and the actual working condition is better simulated;
simulating charge state change of the battery cell in actual work through charging and discharging processes, and maintaining the temperature of the battery cell in a high-temperature environment so as to measure the heat transfer coefficient;
s6, starting a refrigeration function on the semiconductor refrigeration piece by utilizing the low-voltage load device, and keeping the temperature of the refrigeration piece in a proper range;
the method comprises the steps of setting current and voltage parameters of a low-voltage load device to match a semiconductor refrigerating sheet, configuring a PID (proportion-integral-derivative) control system, connecting a semiconductor temperature sensor to the PID control system to monitor the temperature of the semiconductor refrigerating sheet, enabling the position of the semiconductor temperature sensor to correspond to the hot surface of the semiconductor refrigerating sheet, periodically reading data of the semiconductor temperature sensor through the PID control system and comparing the data with a set target temperature, automatically adjusting current output by the PID control system to control the semiconductor temperature when the semiconductor temperature exceeds the set target temperature range, configuring the current and voltage parameters of the low-voltage load device to match the specification and the requirement of the semiconductor refrigerating sheet, ensuring that the current and the voltage values are in a range where the semiconductor refrigerating sheet can safely operate, configuring a PID (proportion-integral-derivative) control system to realize accurate control of the temperature of the semiconductor refrigerating sheet, enabling the semiconductor temperature sensor to automatically adjust control signals according to the difference between the actual temperature and the target temperature so as to maintain stable temperature, connecting the semiconductor temperature sensor to the PID control system so as to monitor the temperature of the semiconductor refrigerating sheet, acquiring the current and voltage parameters of the semiconductor temperature sensor and the semiconductor temperature sensor, and comparing the temperature with the set target temperature sensor to obtain the feedback temperature data of the semiconductor refrigerating sheet through the real-time control system;
current control mode of PID control system:
the proportional control adjusts the current according to the actual temperature deviation, the system adjusts the current output according to the actual temperature deviation through the proportional control, and if the temperature deviates from the target temperature, the system increases or decreases the current to reduce the deviation so as to enable the temperature to approach the target value;
the process temperature is shifted through integral control, namely, the temperature deviates from the target temperature for a long time, and the system accumulates the temperature deviation and gradually reduces the temperature deviation through integral control so as to ensure the temperature to be stable;
the temperature change rate is processed through differential control, and if the temperature change is too fast, the system reduces the change rate of the control signal through differential control so as to maintain stable temperature;
the PID control system automatically adjusts current, corrects the deviation and maintains stable temperature, so that the semiconductor refrigerating sheet is ensured to run in a set target temperature range, and a stable high-temperature environment is provided for experiments;
s7, estimating a heat transfer coefficient by collecting the temperature of the current core and sensor data;
through three temperature sensors longitudinally arranged on the battery core, under the heat balance state, heat flow is stable through a heat transfer medium (the battery core), namely, heat inflow and heat outflow are equal;
the heat transfer coefficient is calculated by the following formula:
q＝h*A*ΔT；
where q is the heat flow (in W), h is the heat transfer coefficient (in W/(m 2. K)), A is the heat transfer surface area (in m 2), and DeltaT is the heat conduction temperature difference (in K);
estimating a heat transfer coefficient: assuming that the bottom area of the battery cell is A1, the top area is A2, the height of the battery cell is h, the temperature of the bottom surface of the battery cell is T1 and the temperature of the top surface of the battery cell is T2 in heat balance, the heat transfer coefficients are respectively calculated as:
h1＝q/(A1*(T1-T_env))，
h2＝q/(A2*(T_top-T2))，
wherein,
t _ env is the ambient temperature and,
t_top is the temperature of the bottom surface after cooling;
the heat transfer coefficients of the different parts can be estimated by the above calculation.
In addition, the application also provides a device for measuring the heat transfer coefficient of the battery cell, which comprises
The device comprises an incubator, two heat pipe radiators, two heat dissipation fans, a semiconductor refrigerating sheet, an electric core, a mounting plate and three temperature sensors;
the two heat pipe radiators and the two heat dissipation fans are arranged at intervals and installed at the inner bottoms of the temperature boxes, the semiconductor refrigerating sheets are installed at the middle parts of the temperature boxes and positioned at the tops of the two heat pipe radiators, the battery cells are arranged at the upper parts of the semiconductor refrigerating sheets, the anode and the cathode of the battery cells are electrically connected with external charging and discharging equipment through wires, the semiconductor refrigerating sheet is electrically connected with an external low-voltage load device, the three temperature sensors are longitudinally arranged on one side of the mounting plate, which is positioned in the incubator, the three probes of the temperature sensors are longitudinally positioned on the outer side of the battery cell, and the mounting plate is fixedly arranged on the inner wall of the incubator.
The foregoing is merely illustrative of the present application, and the present application is not limited thereto, and any person skilled in the art will readily recognize that various changes and substitutions are possible within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A method for measuring heat transfer coefficient of a battery cell is characterized by comprising the following steps: the method comprises the following steps:
s1, setting an experimental environment, wherein the experimental environment is firstly set before the measurement of the heat transfer coefficient of the battery cell, and the method comprises the steps of determining a required temperature range and experimental conditions;
s2, preparing a battery cell, namely selecting a battery cell sample to be measured, and ensuring that the surface of the battery cell sample is clean and free of dirt and impurities;
s3, exposing the battery cell at high temperature, placing the battery cell sample in an incubator, raising the temperature to a target temperature, and standing for a period of time at the temperature;
s4, measuring the heating power of the battery cell, and measuring the heating power of the battery cell through a corresponding temperature sensor in a high-temperature environment;
s5, charging and discharging the battery cell, performing charging and discharging operation on the battery cell through charging and discharging equipment, simulating actual working conditions in a high-temperature environment, and adjusting the internal temperature and current of the battery cell by controlling the charging and discharging process;
s6, starting a refrigeration function on the semiconductor refrigeration piece by utilizing the low-voltage load device, and keeping the temperature of the refrigeration piece in a proper range;
s7, estimating the heat transfer coefficient by collecting the temperature of the current core and the sensor data.
2. A method of measuring a heat transfer coefficient of a cell as defined in claim 1, wherein: in the step S1, firstly, the working temperature range of the battery cell to be measured is determined, the temperature of the experimental room reaches the coverage range, then, the temperature sensor, the charging and discharging equipment and the semiconductor refrigerating sheet measuring and controlling equipment are calibrated, and secondly, necessary safety measures are adopted according to the set temperature range and experimental conditions, including safety risks under the conditions of high temperature and low pressure prevention.
3. A method of measuring a heat transfer coefficient of a cell as defined in claim 1, wherein: in the step S2, determining the type of the battery cell to be measured, wherein the type of the battery cell comprises any one of a lithium ion battery, a polymer lithium ion battery and a nickel-hydrogen battery, and wiping the outer surface of the battery cell with clean microfiber cloth to remove surface dirt and ensure that the surface of the battery cell is completely dry before measurement.
4. A method of measuring a heat transfer coefficient of a cell as defined in claim 1, wherein: in said S3 it is ensured that the incubator has been calibrated and prepared, the desired high temperature environment is reached, the fluctuations of the temperature within the desired range are kept to a minimum, the desired target temperature is selected, which temperature reflects the highest temperature reached by the cell in the actual operating conditions, the cleaned and prepared cell sample is placed in the incubator and air flow is allowed to evenly distribute the temperature, once the incubator reaches the target temperature, the cell sample is given sufficient time to stabilize, and the cell is allowed to stand at the target temperature to reach a thermal equilibrium.
5. A method of measuring a heat transfer coefficient of a cell as defined in claim 1, wherein: in the step S4, the temperature of the battery cell is measured by the temperature sensor, the temperature change of the battery cell is monitored in real time, the battery cell is charged and discharged by using the charging and discharging equipment in a high temperature environment, and the charge and discharge process of the battery cell under the actual working condition is simulated by controlling the current and the voltage, and in the process, the battery cell generates heat by charging and discharging.
6. A method of measuring a heat transfer coefficient of a cell as defined in claim 1, wherein: in the step S5, the electric core is charged to a desired charge state by setting current and voltage parameters in the charging and discharging processes, heat is generated by a sufficient electrothermal effect, and after the charging is completed, the discharging process is started, and the electric core is discharged to the desired charge state, and the discharge in a high-temperature environment ensures that the temperature is kept at the target temperature.
7. A method of measuring a heat transfer coefficient of a cell as defined in claim 1, wherein: in the step S6, a PID (proportion-integral-derivative) control system is configured by setting current and voltage parameters of a low-voltage load device to be matched with a semiconductor refrigerating sheet, the semiconductor temperature sensor is connected to the PID control system to monitor the temperature of the semiconductor refrigerating sheet, the position of the semiconductor temperature sensor corresponds to the hot surface of the semiconductor refrigerating sheet, the data of the semiconductor temperature sensor is periodically read through the PID control system and compared with a set target temperature, and the PID control system automatically adjusts the current output when the semiconductor temperature exceeds the set target temperature range so as to control the semiconductor temperature;
current control mode of PID control system:
the proportional control adjusts the current according to the actual temperature deviation, the processing temperature drifts through integral control, and the processing temperature change rate is controlled through differential control;
the PID control system will automatically adjust the current, correct the deviation and maintain a stable temperature when a temperature deviation is found.
8. A method of measuring a heat transfer coefficient of a cell as defined in claim 1, wherein: in the step S7, by three temperature sensors longitudinally arranged in the cell, in a thermal equilibrium state, the heat flow is stabilized through the heat transfer medium (cell), that is, the heat inflow and the heat outflow are equal;
the heat transfer coefficient is calculated by the following formula:
q＝h*A*ΔT；
where q is the heat flux (in W), h is the heat transfer coefficient (in W/(m 2. K)), A is the heat transfer surface area (in m 2), and DeltaT is the heat conduction temperature difference (in K).
9. A device for measuring heat transfer coefficients of a cell according to any of claims 1-8, wherein: the device comprises an incubator (10), two heat pipe radiators (20), two heat radiating fans (30), a semiconductor refrigerating sheet (40), a battery cell (50), a mounting plate (60) and three temperature sensors (70);
the two heat pipe radiators (20) and the two cooling fans (30) are arranged at intervals and mounted on the inner bottoms of the temperature boxes (10), the semiconductor refrigerating sheets (40) are mounted on the middle parts of the temperature boxes (10) and located at the tops of the two heat pipe radiators (20), the battery cells (50) are arranged on the upper parts of the semiconductor refrigerating sheets (40), the positive electrodes and the negative electrodes of the battery cells (50) are electrically connected with external charging and discharging equipment through wires, and the semiconductor refrigerating sheets (40) are electrically connected with an external low-voltage load device.
10. The apparatus for measuring heat transfer coefficients of a cell of claim 9, wherein: the three temperature sensors (70) are longitudinally arranged on one side of the mounting plate (60) inside the incubator (10), the probes of the three temperature sensors (70) are longitudinally arranged on the outer side of the battery cell (50), and the mounting plate (60) is fixedly arranged on the inner wall of the incubator (10).
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| CN202311190471.9A CN117214232A (en) | 2023-09-14 | 2023-09-14 | Method and device for measuring heat transfer coefficient of battery cell |
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| CN202311190471.9A CN117214232A (en) | 2023-09-14 | 2023-09-14 | Method and device for measuring heat transfer coefficient of battery cell |
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| CN (1) | CN117214232A (en) |
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2023
- 2023-09-14 CN CN202311190471.9A patent/CN117214232A/en active Pending
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