CN111624502A - Extreme environmental temperature lithium ion battery aging test device - Google Patents
Extreme environmental temperature lithium ion battery aging test device Download PDFInfo
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- CN111624502A CN111624502A CN202010306892.3A CN202010306892A CN111624502A CN 111624502 A CN111624502 A CN 111624502A CN 202010306892 A CN202010306892 A CN 202010306892A CN 111624502 A CN111624502 A CN 111624502A
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
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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]
- G01R31/378—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC] specially adapted for the type of battery or accumulator
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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]
- G01R31/392—Determining battery ageing or deterioration, e.g. state of health
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- Secondary Cells (AREA)
Abstract
The invention relates to an extreme environment temperature lithium ion battery aging test device which comprises a thermostat, charging and discharging equipment and a heat exchange module, wherein the heat exchange module comprises a liquid heat exchange loop and a refrigerant heat exchange loop, a heat exchanger evaporates/condenses a refrigerant in the refrigerant heat exchange loop, and heat exchange between the refrigerant heat exchange loop and the liquid heat exchange loop is realized through a heat exchanger refrigerant cavity and a heat exchanger liquid cavity so as to adjust the temperature of a battery heat exchange plate by circulating high-temperature/low-temperature liquid into the battery heat exchange plate and further dynamically adjust the temperature of a lithium ion battery for test. The mode that the battery is heated or cooled by a thermal management system when the battery is at the extreme environment temperature on the actual finished automobile is simulated, so that a necessary test device is provided for researching the internal temperature field distribution inconsistency caused by heating or cooling and the caused differences of the performances and the aging mechanism of different positions in the battery under the conditions that the battery is at the extreme environment temperature and the temperature is regulated by the thermal management system.
Description
Technical Field
The invention relates to the technical field of automobile power batteries, in particular to an extreme environment temperature lithium ion battery aging test device.
Background
The lithium ion battery has many advantages in the aspects of specific energy, specific power, safety performance, cycle performance and the like, so that the lithium ion battery is widely applied to electric automobiles and becomes the preferred type of the power battery of the electric automobiles. Currently, lithium ion batteries used in large volume applications are permitted to operate at temperatures in the range of about 0 ℃ to about 50 ℃, with temperatures in the range of about 15 ℃ to about 35 ℃ being desirable. For automobiles, it is generally required that the vehicle should be able to normally operate at a temperature ranging from-40 ℃ to 52 ℃, and therefore, when the vehicle is used at an extreme environmental temperature (lower than 0 ℃ or higher than 50 ℃), it is necessary to design a proper thermal management system for the battery system, heat the battery at a low temperature, and cool the battery at a high temperature, so as to ensure that the battery system can normally operate.
However, the existing battery thermal management system cannot guarantee the consistency of the internal temperature of the battery in the heating and cooling processes, the performance of the battery is greatly affected by the temperature, the inconsistency of the internal temperature causes aging characteristic differences at different positions inside the cell, premature aging or failure at local positions inside the cell may be caused, and even safety accidents may be caused, for example, a battery operating in a low-temperature environment may cause lithium precipitation at a position with too low local temperature, and further cause local short circuit of the battery, and thermal runaway of the battery is caused.
At present, for the research on the aging behavior of the lithium ion battery, the lithium ion battery monomer is mostly selected as a research object, and the aging test of the battery is carried out in a thermostat, on one hand, the aging mechanism difference of different positions in the battery caused by the inconsistent distribution of the internal temperature of the battery is not considered, on the other hand, the environmental temperature of the test is approximately in the range of 0-45 ℃, the aging performance of the battery in the environment with low temperature (below 0 ℃) and above 45 ℃ is rarely considered, the performance and the aging characteristic of the battery monomer and the internal parts thereof under the condition of matching the same heat management mode as that of the whole vehicle are not considered, and the requirement of the aging test of the lithium ion battery for the vehicle cannot be met.
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides an extreme environment temperature lithium ion battery aging test device, which is used for creating a test environment similar to the real condition of a finished automobile for researching the internal temperature inconsistency caused by heating or cooling a battery at an extreme environment temperature and the caused difference of the performance and the aging characteristic of different positions in the battery by simulating the mode that the battery is heated or cooled by a thermal management system when the battery is at the extreme environment temperature on the finished automobile.
In order to achieve the above purpose, the technical scheme adopted by the invention comprises the following steps:
an extreme environment temperature lithium ion battery aging test device is characterized by comprising a thermostat, charge and discharge equipment and a heat exchange module;
the size of the constant temperature space in the constant temperature box is larger than the size of the lithium ion battery for test, and the lithium ion battery for test is arranged in the constant temperature space in the constant temperature box;
the charging and discharging equipment is arranged outside the constant temperature box and is electrically connected with the lithium ion battery for the test in a wired mode, and the charging and discharging operation is carried out on the lithium ion battery for the test according to the set circulating working condition; the charging and discharging equipment is connected with a temperature sensor of the lithium ion battery for the test, and collects temperature data generated by the temperature sensor in the test process;
the heat exchange module comprises a liquid heat exchange loop and a refrigerant heat exchange loop, the liquid heat exchange loop comprises a battery heat exchange plate, a water pump, a heat exchanger liquid cavity and a liquid pipeline, and the refrigerant heat exchange loop comprises a gas-liquid separator, a capillary tube, a compressor, a reversing valve, a heat exchanger refrigerant cavity and a refrigerant pipeline; the water pump and the heat exchanger liquid cavity are connected with the battery heat exchange plate through the liquid pipeline to form a closed-loop liquid heat exchange loop, and liquid is driven by the water pump to sequentially circulate through the battery heat exchange plate and the heat exchanger liquid cavity in the liquid heat exchange loop; the heat exchanger refrigerant cavity, the reversing valve, the gas-liquid separator, the compressor, the heat exchanger and the capillary tube are connected through the refrigerant pipeline to form a closed-loop refrigerant heat exchange loop; the lithium ion battery for the test is arranged on the heat exchange surface of the battery heat exchange plate and is in heat conduction connection with the heat exchange surface of the battery heat exchange plate through a heat conduction material; the heat exchanger evaporates/condenses the refrigerant in the refrigerant heat exchange loop and realizes the heat exchange between the refrigerant heat exchange loop and the liquid heat exchange loop through the heat exchanger refrigerant cavity and the heat exchanger liquid cavity so as to adjust the temperature of the battery heat exchange plate by circulating high-temperature/low-temperature liquid in the battery heat exchange plate, thereby dynamically adjusting the temperature of the lithium ion battery for the test.
Furthermore, the heat exchanger liquid cavity and the heat exchanger refrigerant cavity are two independent cavities which are encapsulated into a whole and can exchange heat with each other, and the refrigerant in the heat exchanger refrigerant cavity and the liquid in the heat exchanger liquid cavity exchange heat to adjust the temperature of the liquid to form low-temperature/high-temperature liquid; the reversing valve is set to be corresponding to a first working position of a refrigeration cycle or a second working position of a heating cycle.
Further, the water pump is an adjustable flow rate water pump.
Further, the operable constant temperature range of the thermostat is limited to the lithium ion battery test environment temperature range, which is-40 ℃ to 60 ℃.
Further, the heat conducting material is heat conducting silicone grease or a heat conducting silicone pad; the lithium ion battery for the test is detachably arranged on the heat exchange surface of the battery heat exchange plate in a mechanical fixing mode.
Further, the outer surfaces of the lithium ion battery and the battery heat exchange plate for the test are directly exposed in the constant temperature box, or the outer surfaces of the lithium ion battery and the battery heat exchange plate for the test are coated with a heat insulation material.
Furthermore, the temperature sensor of the lithium ion battery for test is arranged at the position of two pole lugs of the lithium ion battery for test and/or the geometric center position of each surface of the lithium ion battery for test.
Further, the reversing valve is a two-position four-way valve.
Further, the liquid is a mixed solution of water and glycol with the mass ratio of the glycol of 50%; the refrigerant is R600 a.
The invention has the beneficial effects that:
the lithium ion battery aging test device with the extreme environment temperature can simulate the actual real environment temperature under the extreme environment temperature, firstly heat or cool the battery through the heat exchange of the liquid heat exchange loop and the refrigerant heat exchange loop in the heat exchange module, then carry out aging tests on the battery under various charging and discharging circulation working conditions by combining with charging and discharging equipment, keep the extreme test environment temperature through the constant temperature box in the test process, maintain the battery to work in an ideal temperature range through the heating or cooling of the heat exchange module with a specific structure, and provide a test environment for the research of the internal temperature field distribution rule of the lithium ion battery with a real heat management system under the extreme environment temperature in the process of simulating the heating or cooling of the lithium ion battery; the test environment can be created for researching the aging behavior of the battery with a real heat management system at extreme environmental temperature and the aging mechanism difference test of different positions in the battery; the device provides a necessary test device for researching the distribution rule of the internal temperature field of the lithium ion battery, the aging mechanism under various charging and discharging cycle working conditions and the aging mechanism difference at different positions caused by the inconsistency of the temperature distribution in the battery under the condition that the lithium ion battery is under the extreme test environment temperature and is attached with a real thermal management system.
Drawings
Fig. 1 is a schematic structural diagram of an extreme environment temperature lithium ion battery aging test device of the present invention.
Description of the figure numbering:
the device comprises a 1-thermostat, a 2-test lithium ion battery, a 3-battery heat exchange plate, a 4-liquid pipeline, a 5-water pump, a 6-heat exchanger liquid cavity, a 7-gas-liquid separator, an 8-heat exchanger refrigerant cavity, a 9-capillary tube, a 10-heat exchanger, an 11-compressor, a 12-two-position four-way valve, a 13-refrigerant pipeline and 14-charge and discharge equipment.
Detailed Description
For a clearer understanding of the contents of the present invention, reference will be made to the accompanying drawings and examples.
Fig. 1 is a schematic structural diagram of an extreme environment temperature lithium ion battery aging test device according to the present invention, which mainly comprises a thermostat 1, a charge and discharge device 14, and a heat exchange module. The size of the constant-temperature space in the constant-temperature box 1 is larger than the size of the volume of the lithium ion battery 2 for the test, and the lithium ion battery 2 for the test is completely arranged in the constant-temperature space in the constant-temperature box 1; the operable constant temperature range of the thermostat 1 corresponding to the lithium ion battery aging test is-40 ℃ to 60 ℃, namely the thermostat 1 can provide a stable test environment completely suitable for the lithium ion battery test environment temperature range. The charging and discharging equipment 14 is arranged outside the incubator, is electrically connected with the lithium ion battery 2 for test in a wired mode, and performs charging and discharging operations on the lithium ion battery 2 for test through a test instruction according to a set cycle condition; the charging and discharging device 14 is in data connection with the temperature sensor of the lithium ion battery 2 for testing in a wired manner, and collects temperature data generated by the temperature sensor in the testing process, preferably, the temperature sensor may be disposed at two tab positions of the lithium ion battery 2 for testing and/or at a geometric center position of each surface of the lithium ion battery 2 for testing as required. The heat exchange module comprises a liquid heat exchange loop and a refrigerant heat exchange loop, wherein the liquid heat exchange loop comprises a battery heat exchange plate 3, a liquid pipeline 4, a water pump 5 and a heat exchanger liquid cavity 6; the battery heat exchange plate 3 is fixedly arranged in a constant temperature space in the constant temperature box 1, preferably can be arranged at the bottom of the constant temperature space, the lithium ion battery 2 for test is arranged on the heat exchange surface of the battery heat exchange plate 3 and is in heat conduction connection with the heat exchange surface of the battery heat exchange plate 3 through a heat conduction material (such as heat conduction silicone grease or a heat conduction silicone pad), particularly, the lithium ion battery 2 for test can be detachably arranged on the heat exchange surface of the battery heat exchange plate 3 in a mechanical fixing mode (such as a buckle structure, a bolt fixing structure and the like), and therefore the stability of the device in the test process is guaranteed, and the battery to be tested can be conveniently switched and utilized among different tests; according to the test requirements, the outer surfaces of the lithium ion battery 2 and the battery heat exchange plate 3 for the test which are installed in place can be directly exposed in a constant temperature box or can be integrally coated with a heat insulation material, so that the actual conditions of the lithium ion battery and the battery heat exchange plate in actual use can be better simulated; the refrigerant heat exchange loop comprises a gas-liquid separator 7, a capillary tube 9, a compressor 11, a reversing valve (preferably a two-position four-way valve 12 in the embodiment), a heat exchanger 10, a heat exchanger refrigerant cavity 8 and a refrigerant pipeline 13, wherein the heat exchanger 19 evaporates/condenses the refrigerant in the refrigerant heat exchange loop and realizes heat exchange between the refrigerant heat exchange loop and the liquid heat exchange loop through the heat exchanger refrigerant cavity 8 and the heat exchanger liquid cavity 6 so as to adjust the temperature of the battery heat exchange plate 3 by circulating high-temperature/low-temperature liquid into the battery heat exchange plate 3 and further dynamically adjust the temperature of the lithium ion battery 2 for the test.
Specifically, the water pump 5 and the heat exchanger liquid cavity 6 are connected with the battery heat exchange plate 3 through the liquid pipeline 4 to form a closed-loop liquid heat exchange loop, liquid (preferably a mixed solution of water and glycol with the mass ratio of glycol of 50%) is driven by the water pump 5 in the liquid heat exchange loop to sequentially circulate through the battery heat exchange plate 3 and the heat exchanger liquid cavity 6, the battery heat exchange plate 3 is respectively connected with the water pump 5 and the heat exchanger liquid cavity 6 through the liquid pipeline 4, and the heat of the test lithium ion battery is taken away/increased by the liquid medium circulating inside the battery heat exchange plate through a heat transfer mode, so that the heating or cooling purpose is achieved, and the flow speed of the liquid medium is controlled through the water pump 5 to adjust the heat exchange amount. The liquid pipeline 4 is used for connecting various parts of the liquid heat exchange loop to form a loop for circulating the liquid medium. A water pump 5 is connected between the battery heat exchanger plate 3 and the heat exchanger liquid chamber 6 via a liquid line 4, controlling the speed of the liquid flow in the liquid circuit. The water pump 5 is preferably an adjustable flow rate water pump to control the flux of liquid in the liquid heat exchange loop, so as to adjust the heat exchange quantity of the battery heat exchange plate 3; the heat exchanger comprises a refrigerant cavity 8, a two-position four-way valve 12, a gas-liquid separator 7, a compressor 11, a heat exchanger 10 and a capillary tube 9, wherein the refrigerant pipeline 13 is connected to form a closed-loop refrigerant heat exchange loop, the refrigerant pipeline 13 is used for connecting all parts of the refrigerant heat exchange loop to form a complete refrigerant heat exchange loop, and the refrigerant in the refrigerant pipeline 13 is preferably R600 a. The heat exchanger liquid cavity 6 and the heat exchanger refrigerant cavity 8 jointly form a heat exchanger of a liquid heat exchange loop and a refrigerant heat exchange loop, and the heat exchanger is used for realizing the heat exchange of the liquid heat exchange loop and the refrigerant heat exchange loop. The gas-liquid separator 7 is connected with the compressor 11 and the two-position four-way valve 12 through a refrigerant pipeline 13 and is used for separating liquid in the refrigerant medium. The capillary tube 9 is connected with the heat exchanger cooling medium cavity 8 and the heat exchanger 10 through a cooling medium pipeline 13 respectively, and can change a high-pressure cooling medium into a low-pressure cooling medium. The compressor 11 is respectively connected with the gas-liquid separator 7 and the two-position four-way valve 12 through a refrigerant pipeline 13 and can pressurize the refrigerant, and the compressor 11 drives the gas-liquid separator 7, the heat exchanger 10, the capillary tube 9 and the heat exchanger refrigerant cavity 8 in the refrigerant heat exchange loop; the heat exchanger liquid cavity 6 and the heat exchanger refrigerant cavity 8 are two independent cavities which are encapsulated into a whole and can exchange heat with each other, and the refrigerant in the heat exchanger refrigerant cavity 8 and the liquid in the heat exchanger liquid cavity 6 exchange heat to adjust the temperature of the liquid to form low-temperature/high-temperature liquid; the two-position four-way valve 12 is connected in the refrigerant heat exchange loop through a refrigerant pipeline 13 and used for realizing the switching of the circulating refrigerant heat exchange loop, and the two-position four-way valve 12 can be set to be a first working position corresponding to a refrigeration cycle or a second working position corresponding to a heating cycle.
The lithium ion battery that the experiment relates to probably has various appearance shape, and in order to realize good experimental effect, battery heat transfer board 3 can adopt different models according to the actual appearance shape of lithium ion battery 2 for the experiment, makes the heat transfer surface of battery heat transfer board 3 can well laminate the surface of lithium ion battery 2 for the experiment, for example correspond square battery and can adopt the battery heat transfer board 3 of flat structure, correspond cylindrical battery and can adopt the battery heat transfer board 3 that the heat transfer surface is the curved surface.
When the lithium ion battery 2 for the test needs to be heated or cooled, the water pump 5 is controlled to work, so that liquid flows through the battery heat exchange plate 3 to heat or cool the lithium ion battery 2 for the test, then enters the heat exchanger liquid cavity 6 to complete heat exchange with the heat exchanger refrigerant cavity 8, and finally returns to the water pump 5.
The two-position four-way valve 12 is a preferred component of this embodiment, other types of reversing valves or other types of four-way reversing valves may also be adopted in the present invention, and the working principle of the extreme environment temperature lithium ion battery aging test apparatus of the present invention is described below by taking the two-position four-way valve as an example. A first working position of the two-position four-way valve 12 corresponds to a refrigeration cycle working state of the heat exchange system, and under the first working position, a working state of a refrigerant cavity 8 of the heat exchanger is an evaporator, and a working state of the heat exchanger 10 is a condenser; the low-temperature low-pressure superheated gaseous refrigerant passing through the refrigerant cavity 8 of the heat exchanger enters the gas-liquid separator 7 through the two-position four-way valve 12 to separate liquid, is sucked by the compressor 11, is compressed into high-temperature high-pressure gaseous refrigerant, then enters the heat exchanger 10 through the two-position four-way valve 12, releases heat and condenses into liquid refrigerant, then flows through the capillary tube 9, and due to the resistance effect of the capillary tube 9, the refrigerant is decompressed into low-temperature low-pressure two-phase fluid, enters the refrigerant cavity 8 of the heat exchanger to be evaporated and absorb heat, and thus the continuous circulation is realized, and the working. When the two-position four-way valve 12 is at the second working position, corresponding to the heating cycle working state of the heat exchange system, under the second working position, the working state of the heat exchanger refrigerant cavity 8 is a condenser, and the working state of the heat exchanger 10 is an evaporator; the low-temperature low-pressure superheated gaseous refrigerant passing through the heat exchanger 10 enters the gas-liquid separator 7 through the two-position four-way valve 12 to separate liquid, is sucked by the compressor 11, is compressed into high-temperature high-pressure gaseous refrigerant, then enters the heat exchanger refrigerant cavity 8 through the two-position four-way valve 12, releases heat and condenses into liquid refrigerant, then flows through the capillary tube 9, and due to the resistance effect of the capillary tube 9, the refrigerant is decompressed into low-temperature low-pressure two-phase fluid, enters the heat exchanger 10 to be evaporated and absorb heat, and is continuously circulated in the way, so that the heating circulation working. Different heat management controls of cooling and heating of the lithium ion battery 2 for the test can be realized by switching between the first working position and the second working position of the two-position four-way valve 12.
When the aging test device for the lithium ion battery at the extreme environmental temperature is actually applied, the aging test of the lithium ion battery is completed by adopting the following steps:
s1, setting a thermostat to a selected temperature for testing within the test environment temperature range of the lithium ion battery;
s2, fixedly placing the lithium ion battery for test provided with the temperature sensor on a battery heat exchange plate in an incubator, connecting the temperature sensor and the lithium ion battery for test to charge and discharge equipment in a wired mode, and keeping the lithium ion battery for test standing in the incubator with the selected temperature for a period of time (preferably at least 24 hours);
s3, starting a heat exchanger, condensing/evaporating a refrigerant in a refrigerant heat exchange loop through the heat exchanger, and realizing heat exchange of the refrigerant heat exchange loop and a liquid heat exchange loop through a refrigerant cavity of the heat exchanger and a liquid cavity of the heat exchanger so as to circulate a low-temperature/high-temperature liquid into a battery heat exchange plate to adjust the lithium ion battery for the test to be within an ideal temperature range of the lithium ion battery, and simultaneously keeping a constant temperature box at the selected temperature for the test; preferably, the temperature of the lithium ion battery extreme test environment is-20 ℃, 10 ℃, 50 ℃ and 55 ℃; the ideal temperature range of the lithium ion battery is 15-35 ℃;
s4, operating the charging and discharging equipment to perform an aging test on the lithium ion battery for the test according to a preset circulation working condition, simultaneously keeping the constant temperature box at the constant temperature for the test, and adjusting the lithium ion battery for the test to be kept in the ideal temperature range of the lithium ion battery or the preset test temperature range through circulating low-temperature/high-temperature liquid in the battery heat exchange plate, namely, controlling the temperature of the contact surface of the lithium ion battery for the test and the battery heat exchange plate to be within the ideal working temperature range of the lithium ion battery of 15-35 ℃ in the charging and discharging test process of the lithium ion battery for the test; preferably, the lithium ion battery for testing can be controlled to work at the temperature designed by the test scheme by the lithium ion battery aging test device provided by the invention according to the requirements of the test scheme; the low-temperature/high-temperature liquid is obtained by performing a cooling/heating heat exchange process on the liquid by operating a two-position four-way valve in the heat exchanger to be set to a first working position corresponding to a refrigeration cycle or a second working position corresponding to a heating cycle.
After the temperature of the contact surface of the lithium ion battery 2 for test and the battery heat exchange plate 3 reaches the range of 15-35 ℃, the lithium ion battery 2 for test is subjected to charge and discharge test according to a set cycle condition through the charge and discharge equipment 14, the thermostat 1 always keeps the set extreme environment test temperature of the lithium ion battery 2 during the test, and the working temperature of the lithium ion battery 2 for test is adjusted within the range required by the test scheme by dynamically adjusting the working states of the liquid heat exchange loop and the refrigerant heat exchange loop. By using the device provided by the invention, the distribution rule of the internal temperature field of the lithium ion battery under the extreme test environment temperature and with a real thermal management system, the aging mechanism under various charge-discharge cycle working conditions and the aging mechanism difference at different positions caused by the inconsistency of the temperature distribution in the battery can be researched.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. An extreme environment temperature lithium ion battery aging test device is characterized by comprising a thermostat, charge and discharge equipment and a heat exchange module;
the size of the constant temperature space in the constant temperature box is larger than the size of the lithium ion battery for test, and the lithium ion battery for test is arranged in the constant temperature space in the constant temperature box;
the charging and discharging equipment is arranged outside the constant temperature box and is electrically connected with the lithium ion battery for the test in a wired mode, and the charging and discharging operation is carried out on the lithium ion battery for the test according to the set circulating working condition; the charging and discharging equipment is connected with a temperature sensor of the lithium ion battery for the test, and collects temperature data generated by the temperature sensor in the test process;
the heat exchange module comprises a liquid heat exchange loop and a refrigerant heat exchange loop, the liquid heat exchange loop comprises a battery heat exchange plate, a water pump, a heat exchanger liquid cavity and a liquid pipeline, and the refrigerant heat exchange loop comprises a gas-liquid separator, a capillary tube, a compressor, a reversing valve, a heat exchanger refrigerant cavity and a refrigerant pipeline; the water pump and the heat exchanger liquid cavity are connected with the battery heat exchange plate through the liquid pipeline to form a closed-loop liquid heat exchange loop, and liquid is driven by the water pump to sequentially circulate through the battery heat exchange plate and the heat exchanger liquid cavity in the liquid heat exchange loop; the heat exchanger refrigerant cavity, the reversing valve, the gas-liquid separator, the compressor, the heat exchanger and the capillary tube are connected through the refrigerant pipeline to form a closed-loop refrigerant heat exchange loop; the lithium ion battery for the test is arranged on the heat exchange surface of the battery heat exchange plate and is in heat conduction connection with the heat exchange surface of the battery heat exchange plate through a heat conduction material; the heat exchanger evaporates/condenses the refrigerant in the refrigerant heat exchange loop and realizes the heat exchange between the refrigerant heat exchange loop and the liquid heat exchange loop through the heat exchanger refrigerant cavity and the heat exchanger liquid cavity so as to adjust the temperature of the battery heat exchange plate by circulating high-temperature/low-temperature liquid in the battery heat exchange plate, thereby dynamically adjusting the temperature of the lithium ion battery for the test.
2. The test device according to claim 1, wherein the heat exchanger liquid cavity and the heat exchanger refrigerant cavity are two independent cavities which are sealed into a whole and can exchange heat with each other, and the refrigerant in the heat exchanger refrigerant cavity and the liquid in the heat exchanger liquid cavity exchange heat to adjust the temperature of the liquid to form low-temperature/high-temperature liquid; the reversing valve is set to be corresponding to a first working position of a refrigeration cycle or a second working position of a heating cycle.
3. The test rig according to claim 2, wherein the water pump is an adjustable flow rate water pump.
4. The testing device of claim 1 or 2, wherein the oven's operable constant temperature range defines a lithium ion battery testing ambient temperature range that is-40 ℃ to 60 ℃.
5. The testing device of claim 1 or 2, wherein the thermally conductive material is a thermally conductive silicone grease or a thermally conductive silicone pad; the lithium ion battery for the test is detachably arranged on the heat exchange surface of the battery heat exchange plate in a mechanical fixing mode.
6. The test device according to claim 1 or 2, wherein the outer surfaces of the lithium ion battery and the battery heat exchange plate for the test are directly exposed in the incubator, or the outer surfaces of the lithium ion battery and the battery heat exchange plate for the test are coated with a thermal insulation material.
7. The test device according to claim 1 or 2, wherein the temperature sensors of the lithium ion battery for test are arranged at two tab positions of the lithium ion battery for test and/or at a geometric center position of each surface of the lithium ion battery for test.
8. The test rig of claim 2, wherein the diverter valve is a two-position, four-way valve.
9. The test device according to claim 2, wherein the liquid is a mixed solution of water and glycol with the mass ratio of glycol being 50%; the refrigerant is R600 a.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112698221A (en) * | 2020-12-15 | 2021-04-23 | 合肥国轩高科动力能源有限公司 | Ternary lithium ion battery functional test bench and test method thereof |
| CN113659246A (en) * | 2021-10-20 | 2021-11-16 | 中国气象科学研究院 | Battery system suitable for polar region ultralow temperature environment and temperature control method thereof |
| US20220099606A1 (en) * | 2020-09-25 | 2022-03-31 | Google Llc | Thermal Gradient Battery Monitoring System and Methods |
| US11668756B2 (en) | 2020-09-25 | 2023-06-06 | Google Llc | Battery degradation monitoring system and methods |
| US12057592B2 (en) | 2020-09-25 | 2024-08-06 | Google Llc | Battery expansion control system |
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