CN114965570A - Heat exchange performance test bed for direct cooling and direct heating plate of power battery - Google Patents
Heat exchange performance test bed for direct cooling and direct heating plate of power battery Download PDFInfo
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Abstract
The invention discloses a test bed for heat exchange performance of a direct-cooling direct-heating plate of a power battery, which comprises a refrigerating and heating system formed by a liquid storage device, a compressor, a four-way reversing valve, a heat exchanger, a two-way electronic expansion valve and the direct-cooling direct-heating plate which are arranged on the test bed; the test bench is provided with a cold source and heat source simulation device; a temperature uniformity test board is arranged in the incubator, temperature sensing probes are arranged on the temperature uniformity test board at equal intervals, a flowmeter is connected to a pipeline at the outlet end of the compressor, and a first temperature and pressure sensor and a second temperature and pressure sensor are respectively connected to pipelines connected with the inlet end and the outlet end of the direct cooling and direct heating board; the invention has the advantages of capability of simulating two working conditions of direct cooling and direct heating when the direct cooling and direct heating plate is used, higher precision of measuring the heat exchange performance and the temperature uniformity of the direct cooling and direct heating plate, simple structure, low measurement cost, high measurement efficiency, low processing cost, less energy consumption, simple and convenient measurement operation and replacement operation of the direct cooling and direct heating plate, and the like.
Description
Technical Field
The invention relates to the technical field of detection of heat exchange performance of a uniform temperature plate, in particular to a test bed for heat exchange performance of a direct cooling and direct heating plate of a power battery.
Background
Along with the requirements of capacity improvement and quick charging of a new energy automobile power battery pack, the heat exchange quantity of the power battery pack is gradually improved, the liquid cooling and liquid heat conduction modes of the temperature control plate hardly meet the cooling and heating requirements of the battery pack, the temperature control plate is replaced by a direct cooling direct heating plate, under the direct cooling working condition, a refrigerant entering the direct cooling plate is a liquid medium from an outlet of an expansion valve, and is vaporized and absorbed in the direct cooling direct heating plate to cool a power battery module in contact with the surface of the direct cooling direct heating plate; under the direct heating working condition, the refrigerant entering the direct cooling plate is a gaseous medium from the outlet of the compressor, is liquefied in the direct cooling direct heating plate to release heat, and heats the power battery module in contact with the surface of the direct cooling direct heating plate; under two working conditions, the heat exchange depends on the phase change of the refrigerant, compared with the heat convection of a liquid cooling plate (temperature control plate), the heat exchange coefficient is high, the heat exchange capability is strong, the temperature of the refrigerant does not change in the heat exchange process, only the dryness of the refrigerant changes, a uniform and stable cold source or heat source can be provided, the combination of the direct cooling plate and the heat pump system on the new energy automobile increases the heating demand of the direct cooling plate under the heat pump working condition, therefore, the heat pump system of the new energy automobile is generally a direct cooling direct heating plate, the temperature uniformity and the heat exchange performance of the direct cooling direct heating plate are important parameters of the direct cooling direct heating plate, the temperature uniformity of the direct cooling direct heating plate is better, the temperature uniformity of the power battery is better when the power battery exchanges heat, the power battery pack can maintain higher charge and discharge rates of the refrigerant, the service life is prolonged, the direct cooling direct heating plate adopts the heat absorption and heat release capabilities in the phase change process to exchange, the patent publication No. CN208937522U discloses a heat transfer performance testing device for a temperature control plate of a power battery of an electric vehicle, which conducts heat and cools the temperature control plate through heat conducting liquid and cooling liquid in a refrigerating device and a heating device, heats and cools a heat insulating water tank above the temperature control plate through the heat conducting liquid and the cooling liquid in the refrigerating device and the heating device, and uses the heat insulating water tank as a simulation cold source and a simulation heat source to exchange heat with the heat insulating water tank and measure the temperature control plate, but because the temperature control plate conducts heat exchange through a liquid medium when in use, the direct cooling direct heating plate conducts phase change refrigeration and phase change heating through a phase change medium, the two working conditions have great difference, and the direct cooling direct heating plate can not be truly simulated under the two working conditions of direct cooling and direct heating, the measurement of the heat exchange performance of the direct cooling and heating plate and the measurement of the temperature uniformity have the problems of low precision, complex structure, high measurement cost, low measurement efficiency, high processing cost, high energy consumption and the like.
Disclosure of Invention
The invention aims to overcome the existing defects and provide a test bed for testing the heat exchange performance of a direct-cooling direct-heating plate of a power battery, which can simulate two working conditions of direct cooling and direct heating when the direct-cooling direct-heating plate is used, has higher precision of measuring the heat exchange performance and the temperature uniformity test of the direct-cooling direct-heating plate, simple structure, low measurement cost, high measurement efficiency, stronger expandability, low processing cost and less energy consumption, is simple and convenient in measurement operation and replacement operation of the direct-cooling direct-heating plate, and can effectively solve the problems in the background technology.
In order to realize the purpose, the invention provides the following technical scheme: a heat exchange performance test bed for a direct-cooling direct-heating plate of a power battery comprises a test bed, wherein a liquid storage device, a compressor, a four-way reversing valve, a heat exchanger, a two-way electronic expansion valve and a direct-cooling direct-heating plate are arranged on the test bed, the liquid storage device, the compressor, the four-way reversing valve, the heat exchanger, the two-way electronic expansion valve and the direct-cooling direct-heating plate are sequentially connected end to end through pipelines, and a fan is fixedly arranged on one side, positioned on the heat exchanger, of the test bed; the four interfaces of the four-way reversing valve are respectively a first interface, a second interface, a third interface and a fourth interface, a connecting pipeline at the outlet end of the compressor is connected with the first interface, the second interface is connected with a connecting pipe at the outlet end of the direct cooling and direct heating plate, the third interface is connected with a connecting pipeline at the inlet end of the liquid accumulator, and the fourth interface is connected with a connecting pipeline at the inlet end of the heat exchanger; the periphery of the direct cooling and direct heating plate is provided with an insulation box, and the test bed is also provided with a cold source and heat source simulation device; a temperature uniformity test plate is arranged in the heat preservation box, temperature sensing probes are arranged on the temperature uniformity test plate at equal intervals, and the temperature sensing probes are tightly attached to the test surface of the direct cooling and direct heating plate; and a flow meter is connected on a pipeline between the compressor and the first connector, and a first temperature and pressure sensor and a second temperature and pressure sensor are respectively connected on pipelines connected with the inlet end and the outlet end of the direct cooling and direct heating plate.
Furthermore, the cold source heat source simulation device comprises a cold source plate and a heat source plate, a heat source plate power supply is arranged on the test bed and electrically connected with the heat source plate, a flow passage is arranged inside the cold source plate, the outlet end of the flow passage is sequentially connected with a radiator and a water pump through a pipeline, the outlet end of the water pump is connected with the inlet end of the flow passage through a pipeline, and a first water temperature sensor and a second water temperature sensor are respectively arranged on the outlet end of the flow passage inside the cold source plate and the pipeline connected with the inlet end.
Furthermore, two side walls inside the heat preservation box are horizontally provided with supporting plates, the direct-cooling direct-heating plate is placed on one side of the supporting plates in the heat preservation box, and the temperature uniformity testing plate is fixed in the heat preservation box; the opening part of the heat preservation box is hinged with a box cover, and a through hole is formed in the box cover.
Furthermore, the temperature uniformity test board is provided with accommodating grooves at equal intervals towards one surface of the straight cold and hot plate, and the temperature sensing probes are fixedly nested in the accommodating grooves corresponding to the temperature sensing probes.
Furthermore, a recovery stop valve is arranged on a connecting pipeline of the inlet end and the outlet end of the direct cooling and direct heating plate.
In order to achieve the purpose, the invention also provides the following technical scheme: a heat exchange performance test bed for a direct-cooling direct-heating plate of a power battery comprises a test bed, wherein a liquid storage device, a compressor, a four-way reversing valve, a heat exchanger, a two-way electronic expansion valve and a direct-cooling direct-heating plate are arranged on the test bed, the liquid storage device, the compressor, the four-way reversing valve, the heat exchanger, the two-way electronic expansion valve and the direct-cooling direct-heating plate are sequentially connected end to end through pipelines, and a fan is fixedly arranged on one side, positioned on the heat exchanger, of the test bed; the four interfaces of the four-way reversing valve are respectively a first interface, a second interface, a third interface and a fourth interface, a connecting pipeline at the outlet end of the compressor is connected with the first interface, the second interface is connected with a connecting pipe at the outlet end of the direct cooling and direct heating plate, the third interface is connected with a connecting pipeline at the inlet end of the liquid accumulator, and the fourth interface is connected with a connecting pipeline at the inlet end of the heat exchanger; the periphery of the direct cooling and direct heating plate is provided with an insulation box, and the test bed is also provided with a cold source and heat source simulation device; a temperature uniformity test plate is arranged in the heat insulation box, temperature sensing probes are arranged on the temperature uniformity test plate at equal intervals, and the temperature sensing probes are tightly attached to the test surface of the direct cooling and direct heating plate; and a flow meter is connected on a pipeline between the compressor and the first connector, and a first temperature and pressure sensor and a second temperature and pressure sensor are respectively connected on pipelines connected with the inlet end and the outlet end of the direct cooling and direct heating plate.
Furthermore, the cold source and heat source simulation device takes the heat exchange airflow of the heat exchanger as a simulation cold source and a heat source, the cold source and heat source simulation device further comprises an air guide pipeline, an air inlet is formed in one side wall of the heat preservation box, an air outlet is formed in one side wall of the heat preservation box, which is opposite to the air inlet, the inlet end of the air guide pipeline is connected with the heat exchange surface of the heat exchanger, and the outlet end of the air guide pipeline is connected with the air inlet of the heat preservation box.
Furthermore, two side walls inside the heat preservation box are both horizontally provided with a supporting plate, the direct-cooling direct-heating plate is placed on one side of the supporting plate in the heat preservation box, and the temperature uniformity testing plate is fixed in the heat preservation box; the opening part of the heat preservation box is hinged with a box cover, and a through hole is formed in the box cover.
Furthermore, the temperature uniformity test board is provided with accommodating grooves at equal intervals towards one surface of the straight cold and hot plate, and the temperature sensing probes are fixedly nested in the accommodating grooves corresponding to the temperature sensing probes.
Furthermore, a recovery stop valve is arranged on a connecting pipeline of the inlet end and the outlet end of the direct cooling and direct heating plate.
Compared with the prior art, the invention has the beneficial effects that: this direct cold hot plate heat transfer performance test bench of power battery can simulate two kinds of operating modes of direct cold and direct hot when using through this test bench, and the measurement is directly cold the precision of hot plate heat transfer performance measurement and temperature uniformity test higher directly, simple structure, and the measurement cost is low, and measurement of efficiency is high, has stronger scalability, and the processing cost is low, and the power consumption is few, and the measurement operation and the change easy operation of the direct cold board of directly heating are convenient.
Drawings
FIG. 1 is a schematic view of a test stand according to a first embodiment of the present invention;
FIG. 2 is a schematic view of the first embodiment of the present invention illustrating the operation of the direct cooling and direct heating plate during the heating condition test;
FIG. 3 is a schematic diagram of the first embodiment of the present invention for the direct cooling and direct heating plate during the cooling condition test;
FIG. 4 is a schematic view of the incubator according to the first embodiment of the present invention;
FIG. 5 is a schematic diagram of a temperature uniformity testing plate according to a first embodiment of the present invention;
FIG. 6 is a partial sectional view of the inside of the incubator according to the first embodiment of the present invention;
FIG. 7 is a schematic structural view of a second embodiment of a test bed according to the present invention;
FIG. 8 is a schematic view of the second embodiment of the present invention illustrating the operation of the direct cooling and direct heating plate during the heating condition test;
FIG. 9 is a schematic diagram of the second embodiment of the present invention during the cooling condition test of the directly cooled and directly heated plate;
FIG. 10 is a schematic view of an incubator according to a second embodiment of the present invention;
fig. 11 is a schematic view of the internal structure of an incubator according to a second embodiment of the present invention.
In the figure: the device comprises a test bed 1, a liquid storage device 2, a compressor 3, a 4-way reversing valve, a first interface, b a second interface, c a third interface, d a fourth interface, a heat exchanger 5, a fan 6, a 7 two-way electronic expansion valve, a 8-way cooling direct heating plate, a 9 heat source plate, a 10 cold source plate, a 11 radiator, a 12 water pump, a 13 water temperature sensor I, a 14 water temperature sensor II, a 15 recovery stop valve, a 16 temperature and pressure sensor I, a 17 temperature and pressure sensor II, an 18 insulation box, a 181 support plate, a 182 box cover, a 183 air inlet, a 184 air outlet, a 19 temperature uniformity test plate, 191 accommodating grooves, a 20 heat source plate power supply, a 21 flow meter and a 22 air guide pipeline.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in 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.
Example one
Referring to fig. 1-6, the present invention provides a technical solution: a heat exchange performance test bed for a direct cooling and direct heating plate of a power battery comprises a test bed 1, wherein a liquid storage device 2, a compressor 3, a four-way reversing valve 4, a heat exchanger 5, a two-way electronic expansion valve 7 and a direct cooling and direct heating plate 8 are arranged on the test bed 1, the liquid storage device 2, the compressor 3, the four-way reversing valve 4, the heat exchanger 5, the two-way electronic expansion valve 7 and the direct cooling and direct heating plate 8 are sequentially connected end to end through pipelines, and a fan 6 is fixedly arranged on one side, located on the heat exchanger 5, of the test bed 1; the four interfaces of the four-way reversing valve 4 are respectively a first interface a, a second interface b, a third interface c and a fourth interface d, a connecting pipeline at the outlet end of the compressor 3 is connected with the first interface a, the second interface b is connected with a connecting pipeline at the outlet end of the direct cooling and direct heating plate 8, the third interface c is connected with a connecting pipeline at the inlet end of the liquid accumulator 2, and the fourth interface d is connected with a connecting pipeline at the inlet end of the heat exchanger 5; an insulation can 18 is arranged on the periphery of the direct-cooling and direct-heating plate 8, supporting plates 181 are horizontally arranged on two side walls in the insulation can 18, the direct-cooling and direct-heating plate 8 is placed on the supporting plates 181 in the insulation can 18, and the temperature uniformity testing plate 19 is fixed in the insulation can 8; a box cover 182 is hinged to an opening of the heat preservation box 18, a through hole is formed in the box cover 182 and used for connecting a wire harness and a pipeline, the through hole is sealed through a sealing sleeve during experiments, a temperature uniformity test plate 19 is arranged in the heat preservation box 18, temperature sensing probes are arranged on the temperature uniformity test plate 19 at equal intervals, and the temperature sensing probes are tightly attached to a test surface of the direct cooling and direct heating plate 8; a flow meter 21 is connected to a pipeline between the compressor 3 and the first connector a, and a first temperature and pressure sensor 16 and a second temperature and pressure sensor 17 are respectively connected to pipelines connected to the inlet end and the outlet end of the direct cooling and direct heating plate 8; the test bed 1 is also provided with a cold source and heat source simulation device, and the cold source and heat source simulation device comprises a heat source plate 9 and a cold source plate 10; a temperature sensor is arranged on the heat source plate 9, a heat source plate power supply 20 is arranged on the test bed 1, and the heat source plate power supply 20 is electrically connected with the heat source plate 9; the cold source plate 10 is internally provided with a flow channel, the outlet end of the flow channel is sequentially connected with a radiator 11 and a water pump 12 through a pipeline, the outlet end of the water pump 12 is connected with the inlet end of the flow channel through a pipeline, and the pipeline connected with the outlet end and the inlet end of the flow channel in the cold source plate 10 is respectively provided with a first water temperature sensor 13 and a second water temperature sensor 14.
The working principle is as follows: after the direct cooling direct heating plate 8 is connected with a refrigerating and heating system, the recovery stop valves 15 at the inlet end and the outlet end of the direct cooling direct heating plate 8 are opened, and refrigerant filling is carried out on the refrigerating and heating system through refrigerant filling equipment; then, detecting the heat exchange performance of the direct cooling and direct heating plate 8;
during the direct cooling hot plate 8 cooling condition test: a heat source plate 9 is placed in an incubator 18, a heat exchange surface of a direct-cooling direct-heating plate 8 in the incubator 18 is tightly attached to a cold source plate 10, then a box cover 182 is closed, a first interface a and a fourth interface d of a four-way reversing valve 4 are communicated, a second interface b is communicated with a third interface c, a compressor 3, a fan 6 and a two-way electronic expansion valve 7 are started, then the direct-cooling direct-heating plate 8 is circularly cooled, the heat source plate 9 starts to be heated by opening a heat source plate power supply 20, temperature detection is carried out on the heat source plate 9 through a temperature sensor arranged on the heat source plate 9, the direct-cooling direct-heating plate 8 carries out heat exchange on the heat source plate 9, the flow of a refrigerant passing through the direct-cooling direct-heating plate 8 is collected through a flowmeter 21, pressure and temperature parameters in front and back of the direct-cooling direct-heating plate 8 are collected by a first temperature and pressure sensor 16 and a second temperature and pressure sensor 17, and enthalpy values at the corresponding positions can be calculated through pressure and temperature values at the inlet and outlet of the direct-cooling direct-heating plate 8, the heat exchange quantity of the direct-cooling direct-heating plate 8 can be calculated by combining the flow of the refrigerant, the temperature of each area on the surface of the direct-cooling direct-heating plate 8 is measured by the temperature sensing probe on the temperature uniformity test plate 19, and the temperature uniformity performance of the direct-cooling direct-heating plate 8 is evaluated;
during the direct cooling and direct heating plate 8 heating condition test: placing a cold source plate 10 in an insulation box 18, enabling the cold source plate 10 to be tightly attached to a heat exchange surface of a direct-cooling direct-heating plate 8 in the insulation box 18, then closing a box cover 182, enabling a first interface a and a second interface b of a four-way reversing valve 4 to be communicated, enabling a third interface c and a fourth interface d to be communicated, starting a compressor 3, a fan 6 and a two-way electronic expansion valve 7, then enabling the direct-cooling direct-heating plate 8 to be heated in a circulating mode, pumping cold water in a radiator 11 into a flow channel in the cold source plate 10 through a water pump 12 to be cooled, conducting heat dissipation and cooling on hot water at an outlet of the flow channel through the radiator 11, detecting water inlet temperature and water outlet temperature of the flow channel in the cold source plate 10 through a water temperature sensor I13 and a water temperature sensor II 14, collecting refrigerant flow of a refrigerant passing through the direct-cooling direct-heating plate 8 through a flowmeter 21, and collecting pressure and temperature parameters before and after the direct-cooling direct-heating plate 8 through a temperature sensor I16 and a temperature pressure sensor II 17, the enthalpy value of the corresponding position can be calculated through the measured pressure and temperature value of the inlet and the outlet of the direct cooling direct heating plate 8, the flow of the refrigerant is combined, the heat exchange quantity of the direct cooling direct heating plate 8 can be calculated, and the temperature of each area on the surface of the direct cooling direct heating plate 8 is measured through the temperature sensing probe on the temperature uniformity test plate 19, so that the temperature uniformity performance of the direct cooling direct heating plate 8 is evaluated;
further, all be equipped with on the connecting pipeline of the straight hot plate 8 entrance point of directly cooling and exit end and retrieve stop valve 15, close the recovery stop valve 15 of the straight hot plate 8 entrance point of directly cooling after experimental completion, stop for a few seconds and then close the straight hot plate 8 exit end of directly cooling and retrieve stop valve 15, retrieve the refrigerant through refrigerant recovery unit.
Furthermore, the temperature uniformity test board 19 is provided with holding grooves 191 at equal intervals on one surface facing the direct cooling and direct heating plate 8, and the temperature sensing probes are fixedly nested in the holding grooves 191 corresponding to the temperature uniformity test board.
In the embodiment, the liquid storage device 2, the compressor 3, the four-way reversing valve 4, the heat exchanger 5, the fan 6, the two-way electronic expansion valve 7 and the direct-cooling direct-heating plate 8 form a circulating phase-change refrigeration and phase-change heating system, the circulating phase-change refrigeration and phase-change heating system simulates the real phase-change refrigeration and heating situation of the direct-cooling direct-heating plate 8 when in use, the heat source plate 9 and the cold source plate 10 simulate the situation that the temperature of a battery pack is too high or too low, the heating of the heat source plate 9 and the cooling of the cold source plate 10 are high in corresponding speed, the heat loss of the direct-cooling direct-heating plate 8 during heat exchange is reduced through the heat preservation box 18, and the detection precision is improved; the four-way reversing valve 4 and the two-way electronic expansion valve 7 are used for effectively simplifying the pipelines and the control system of the system, while the conventional direct-cooling and direct-heating plate refrigerating and heating system generally adopts two branches which are connected in parallel, one branch is the electronic expansion valve, the other branch is the stop valve, when throttling is needed, the electronic expansion valve works, the stop valve is closed, when a passage is needed, the stop valve is opened, and the electronic expansion valve is closed, in the embodiment, the two refrigerating pipelines and the two heating pipelines which are originally needed can be simplified into one pipeline by adopting the two-way electronic expansion valve 7, parts are also reduced from four to one, and the control system is also simplified to a certain extent; this test bench can simulate two kinds of operating modes of directly cold and directly hot plate 8 when using, it is higher to measure the precision of 8 heat transfer performance measurement of the straight cold hot plate and temperature uniformity test, moreover, the steam generator is simple in structure, the measurement cost is low, the measurement efficiency is high, and has strong expandability, it only needs to be connected with refrigeration heating system with the straight cold hot plate 8 of changing when changing the straight cold hot plate 8 test, and with corresponding cold source board 10 and the installation of heat source board 9 can, do not need too much operating procedure, it is convenient to measure.
Example two
Referring to fig. 7-11, the present invention provides a technical solution: a heat exchange performance test bed for a direct-cooling direct-heating plate of a power battery comprises a test bed 1, wherein a liquid storage device 2, a compressor 3, a four-way reversing valve 4, a heat exchanger 5, a bidirectional electronic expansion valve 7 and a direct-cooling direct-heating plate 8 are arranged on the test bed 1, the liquid storage device 2, the compressor 3, the four-way reversing valve 4, the heat exchanger 5, the bidirectional electronic expansion valve 7 and the direct-cooling direct-heating plate 8 are sequentially connected end to end through pipelines, and a fan 6 is fixedly arranged on one side, located on the heat exchanger 5, of the test bed 1; the four interfaces of the four-way reversing valve 4 are respectively a first interface a, a second interface b, a third interface c and a fourth interface d, a connecting pipeline at the outlet end of the compressor 3 is connected with the first interface a, the second interface b is connected with a connecting pipeline at the outlet end of the direct cooling and direct heating plate 8, the third interface c is connected with a connecting pipeline at the inlet end of the liquid accumulator 2, and the fourth interface d is connected with a connecting pipeline at the inlet end of the heat exchanger 5; an insulation can 18 is arranged on the periphery of the direct-cooling and direct-heating plate 8, supporting plates 181 are horizontally arranged on two side walls in the insulation can 18, the direct-cooling and direct-heating plate 8 is placed on the supporting plates 181 in the insulation can 18, and the temperature uniformity testing plate 19 is fixed in the insulation can 8; a box cover 182 is hinged at the opening of the heat preservation box 18, a through hole is arranged on the box cover 182 and is used for connecting a wire harness and a pipeline, the through hole is sealed by a sealing sleeve during the experiment, an air inlet 183 is arranged on one side wall of the heat preservation box 18, an air outlet 184 is arranged on one side wall of the heat preservation box 18 opposite to the air inlet 183, an air guide pipeline 22 is connected between the heat exchange surface of the heat exchanger 5 and the air inlet 183 of the heat preservation box 18, the heat exchange airflow passing through the heat exchanger 18 is used as a simulation cold source and a simulation heat source, a temperature uniformity test plate 19 is arranged in the heat insulation box 18, temperature sensing probes are arranged on the temperature uniformity test plate 19 at equal intervals, the temperature sensing probes are tightly attached to the testing surface of the direct cooling and direct heating plate 8, a flow meter 21 is connected to a pipeline between the compressor 3 and the first interface a, and a first temperature and pressure sensor 16 and a second temperature and pressure sensor 17 are respectively connected to pipelines connected to the inlet end and the outlet end of the direct cooling and direct heating plate 8;
the working principle is as follows: after the direct cooling direct heating plate 8 is connected with a refrigerating and heating system, the recovery stop valves 15 at the inlet end and the outlet end of the direct cooling direct heating plate 8 are opened, and refrigerant filling is carried out on the refrigerating and heating system through refrigerant filling equipment; then, detecting the heat exchange performance of the direct cooling and direct heating plate 8;
during the direct cooling hot plate 8 cooling condition test: placing a direct-cooling direct-heating plate 8 in an insulation box 18, closing a box cover 182, communicating a first interface a and a fourth interface d of a four-way reversing valve 4, communicating a second interface b and a third interface c, starting a compressor 3, a fan 6 and a two-way electronic expansion valve 7 to circularly cool the direct-cooling direct-heating plate 8, flowing hot air emitted by a heat exchanger 5 into the insulation box 18 along an air guide pipeline 22 through the fan 6 during circular cooling, simulating the situation that the temperature of a battery pack is too high by utilizing hot air flow, exchanging heat between the direct-cooling direct-heating plate 8 and the hot air flow in the insulation box 18, collecting refrigerant flow passing through the direct-cooling direct-heating plate 8 through a flowmeter 21, collecting pressure and temperature parameters in front and back of the direct-cooling direct-heating plate 8 through a temperature and pressure sensor I16 and a temperature and pressure sensor II 17, and calculating the enthalpy value of the corresponding position through the measured pressure and temperature values of an inlet and an outlet of the direct-cooling direct-heating plate 8, the heat exchange amount of the direct-cooling direct-heating plate 8 can be calculated by combining the flow of the refrigerant, the temperature of each area on the surface of the direct-cooling direct-heating plate 8 is measured by a temperature sensing probe on the temperature uniformity test plate 19, and the temperature uniformity performance of the direct-cooling direct-heating plate 8 is evaluated;
during the direct cooling and direct heating plate 8 heating condition test: placing the direct-cooling direct-heating plate 8 in the heat insulation box 18, closing the box cover 182, communicating the first interface a and the second interface b of the four-way reversing valve 4, communicating the third interface c and the fourth interface d, starting the compressor 3, the fan 6 and the two-way electronic expansion valve 7 to circularly heat the direct-cooling direct-heating plate 8, flowing cold air emitted by the heat exchanger 5 into the heat insulation box 18 along the air guide pipeline 22 through the fan 6 during circular heating, simulating the situation that the temperature of the battery pack is too low by using cold air flow, exchanging heat between the direct-cooling direct-heating plate 8 and the cold air flow in the heat insulation box 18, collecting the refrigerant flow passing through the direct-cooling direct-heating plate 8 through the flowmeter 21, collecting pressure and temperature parameters in front and back of the direct-cooling direct-heating plate 8 through the first temperature pressure sensor 16 and the second temperature pressure sensor 17, and calculating the enthalpy value of the corresponding position through the measured pressure and temperature values of the inlet and outlet of the direct-cooling direct-heating plate 8, the heat exchange quantity of the direct cooling direct heating plate 8 can be calculated by combining the flow of the refrigerant, and the temperature sensing probes on the temperature uniformity test plate 19 are used for measuring the temperature of each area on the surface of the direct cooling direct heating plate 8 so as to evaluate the temperature uniformity performance of the direct cooling direct heating plate 8;
furthermore, all be equipped with recovery stop valve 15 on the connecting pipeline of the straight cold hot plate 8 entrance point and exit end, close the recovery stop valve 15 of the straight cold hot plate 8 entrance point after experimental completion, close the straight cold hot plate 8 exit end recovery stop valve 15 of directly after stopping for a few seconds again, retrieve the refrigerant through refrigerant recovery unit.
Furthermore, the temperature uniformity test board 19 is provided with holding grooves 191 at equal intervals on one surface facing the direct cooling and direct heating plate 8, and the temperature sensing probes are fixedly nested in the holding grooves 191 corresponding to the temperature uniformity test board.
In the embodiment, a circulating phase-change refrigeration and phase-change heating system is formed by the liquid storage device 2, the compressor 3, the four-way reversing valve 4, the heat exchanger 5, the fan 6, the two-way electronic expansion valve 7 and the direct-cooling direct-heating plate 8, the circulating phase-change refrigeration and phase-change heating system simulates the real phase-change refrigeration and phase-change heating situation of the direct-cooling direct-heating plate 8 when in use, the hot air flow and the cold air flow emitted by the heat exchanger 5 simulate the situation that the temperature of a battery pack is too high or too low, the stability of heat flow of the direct-cooling direct-heating plate 8 during heat exchange is reduced through the heat insulation box 18, and the detection accuracy is improved; the four-way reversing valve 4 and the two-way electronic expansion valve 7 are used for effectively simplifying the pipelines and the control system of the system, while the conventional direct-cooling and direct-heating plate refrigerating and heating system generally adopts two branches which are connected in parallel, one branch is the electronic expansion valve, the other branch is the stop valve, when throttling is needed, the electronic expansion valve works, the stop valve is closed, when a passage is needed, the stop valve is opened, and the electronic expansion valve is closed, in the embodiment, the two refrigerating pipelines and the two heating pipelines which are originally needed can be simplified into one pipeline by adopting the two-way electronic expansion valve 7, parts are also reduced from four to one, and the control system is also simplified to a certain extent; this test bench can simulate two kinds of operating modes of directly cold and directly hot when using of the straight hot plate 8 that cools off directly, and the precision of measuring 8 heat transfer performance of the straight hot plate that cools off directly and testing with the temperature uniformity is higher, simple structure, and measurement cost is low, and measurement efficiency is high, has stronger scalability.
Compared with the first embodiment, the structure of the embodiment is simpler, the cost is lower, the energy consumption is less, and the measurement operation and the replacement operation of the direct cooling and direct heating plate 8 are simpler.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The utility model provides a direct cold hot plate heat transfer performance test bench of power battery, includes the test bench, its characterized in that: the test bed is provided with a liquid storage device, a compressor, a four-way reversing valve, a heat exchanger, a two-way electronic expansion valve and a direct-cooling direct-heating plate, the liquid storage device, the compressor, the four-way reversing valve, the heat exchanger, the two-way electronic expansion valve and the direct-cooling direct-heating plate are sequentially connected end to end through pipelines, and a fan is fixedly arranged on one side of the test bed, which is positioned on the heat exchanger; the four interfaces of the four-way reversing valve are respectively a first interface, a second interface, a third interface and a fourth interface, a connecting pipeline at the outlet end of the compressor is connected with the first interface, the second interface is connected with a connecting pipe at the outlet end of the direct cooling and direct heating plate, the third interface is connected with a connecting pipeline at the inlet end of the liquid accumulator, and the fourth interface is connected with a connecting pipeline at the inlet end of the heat exchanger; the periphery of the direct cooling and direct heating plate is provided with an insulation box, and the test bed is also provided with a cold source and heat source simulation device; a temperature uniformity test plate is arranged in the heat insulation box, temperature sensing probes are arranged on the temperature uniformity test plate at equal intervals, and the temperature sensing probes are tightly attached to the test surface of the direct cooling and direct heating plate; and a flow meter is connected on a pipeline between the compressor and the first connector, and a first temperature and pressure sensor and a second temperature and pressure sensor are respectively connected on pipelines connected with the inlet end and the outlet end of the direct cooling and direct heating plate.
2. The power battery direct-cooling direct-heating plate heat exchange performance test bench according to claim 1, characterized in that: the cold source heat source simulation device comprises a cold source plate and a heat source plate, a heat source plate power supply is arranged on the test bed and electrically connected with the heat source plate, a flow passage is arranged inside the cold source plate, the outlet end of the flow passage is connected with a radiator and a water pump sequentially through a pipeline, the outlet end of the water pump is connected with the inlet end of the flow passage through a pipeline, and a first water temperature sensor and a second water temperature sensor are arranged on the outlet end of the flow passage inside the cold source plate and the pipeline connected with the inlet end respectively.
3. The power battery direct-cooling direct-heating plate heat exchange performance test bench according to claim 1, characterized in that: two side walls inside the heat preservation box are horizontally provided with supporting plates, the direct-cooling direct-heating plate is placed on one side of the supporting plate in the heat preservation box, and the temperature uniformity test plate is fixed in the heat preservation box; the opening part of the heat preservation box is hinged with a box cover, and a through hole is formed in the box cover.
4. The power battery direct-cooling direct-heating plate heat exchange performance test bench according to claim 1, characterized in that: and the connecting pipelines at the inlet end and the outlet end of the direct cooling and direct heating plate are respectively provided with a recovery stop valve.
5. The heat exchange performance test bench for the direct-cooling and direct-heating plate of the power battery according to claim 1, characterized in that: the temperature uniformity test board is provided with accommodating grooves at equal intervals towards one surface of the straight cold hot plate, and the temperature sensing probes are fixedly nested in the accommodating grooves corresponding to the temperature sensing probes.
6. The power battery direct-cooling direct-heating plate heat exchange performance test bench according to claim 1, characterized in that: the cold source and heat source simulation device takes heat exchange airflow of the heat exchanger as a simulation cold source and a heat source, and further comprises an air guide pipeline, wherein an air inlet is formed in one side wall of the heat preservation box, an air outlet is formed in one side wall, opposite to the air inlet, of the heat preservation box, the inlet end of the air guide pipeline is connected with the heat exchange surface of the heat exchanger, and the outlet end of the air guide pipeline is connected with the air inlet of the heat preservation box.
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Application publication date: 20220830 |