Battery Thermal Management Test System

Abstract

The present application relates to a battery thermal management test system, which includes a refrigerant circulation unit and a coolant circulation unit; the refrigerant circulation unit includes a variable frequency compressor, a condenser, an expansion valve and an evaporator connected in sequence; the two ends of the first flow channel of the evaporator are respectively connected to the expansion valve and the variable frequency compressor; the refrigerant circulation unit also includes a first temperature detection component and a first pressure detection component; the coolant circulation unit includes a coolant circulation pipeline, a second temperature detection component and a third temperature detection component, and the two ends of the second flow channel of the evaporator are respectively connected to the liquid outlet and the liquid return port of the coolant circulation pipeline. The above-mentioned battery thermal management test system facilitates the calibration of the heat load of the battery to be tested and the heat exchange power of the refrigerant circulation unit adapted thereto.

Description

Technical Field

[0001] The present application relates to the technical field of battery testing, and in particular to a battery thermal management testing system. Background Art

[0002] Batteries usually need to undergo thermal management testing after production is completed. The battery thermal management test system includes a refrigerant circulation unit and a coolant circulation unit. When performing a thermal management test on the battery, the outflow port of the coolant circulation unit is connected to the inflow port of the heat exchange channel of the cold plate of the battery to be tested, and the return port of the coolant circulation unit is connected to the outflow port of the heat exchange channel of the cold plate of the battery to be tested, so as to form a coolant circulation loop. While the coolant circulates in the coolant circulation unit, it can cool down the cold plate of the battery to be tested. The refrigerant circulation unit is used to cool the refrigerant, and while the refrigerant circulates in the refrigerant circulation unit, it can transfer cold energy to the coolant in the coolant circulation loop, thereby cooling down the coolant.

[0003] The battery thermal management test system in the related art cannot calibrate the heat exchange power of the adapted refrigerant cycle unit according to the heat load of the battery under test with respect to the battery under test with different heat loads. Utility Model Content

[0004] In view of the above problems, the present application provides a battery thermal management test system, which can facilitate the thermal load calibration of the battery to be tested and the heat exchange power of the refrigerant cycle unit adapted thereto.

[0005] An embodiment of the present application provides a battery thermal management test system, which includes a refrigerant circulation unit and a coolant circulation unit; the refrigerant circulation unit includes: a variable frequency compressor, a condenser, an expansion valve and an evaporator connected in sequence through pipelines; the evaporator includes a first flow channel and a second flow channel isolated from each other, and both ends of the first flow channel are respectively connected to the expansion valve and the variable frequency compressor;

[0006] The refrigeration cycle unit further includes a first temperature detection member and a first pressure detection member, which are respectively arranged on the connecting pipeline between the first flow channel and the variable frequency compressor;

[0007] The coolant circulation unit includes: a coolant circulation pipeline, a second temperature detection component and a third temperature detection component. The two ends of the second flow channel are respectively connected to the liquid outlet and the liquid return port of the coolant circulation pipeline; the second temperature detection component is arranged on the coolant circulation pipeline and located at the liquid inlet of the second flow channel, and the third temperature detection component is arranged on the coolant circulation pipeline and located at the liquid outlet of the second flow channel.

[0008] When the above-mentioned battery thermal management test system calibrates the heat load of the battery to be tested and the heat exchange power of the refrigerant circulation unit adapted thereto, the operating frequency of the variable frequency compressor can be adjusted to adjust the cooling capacity output by the refrigerant circulation unit, and then the cooling capacity transferred from the refrigerant flowing through the first flow channel to the coolant in the second flow channel can be adjusted, that is, the heat exchange power of the refrigerant circulation unit is adjusted. The current temperature and current pressure of the refrigerant at the outlet of the first flow channel are detected by the first temperature detection component and the first pressure detection component. According to the current pressure of the refrigerant at the outlet of the first flow channel detected by the first pressure detection component, the saturation temperature corresponding to the current pressure can be determined; at the same time, the current temperature of the refrigerant at the outlet of the first flow channel detected by the first temperature detection component is compared with the saturation temperature. If the current temperature slightly exceeds the saturation temperature, it indicates that the latent cooling capacity of the refrigerant flowing out of the first flow channel has been completely released; at the same time, if the temperature difference between the temperature value detected by the second temperature detection component and the temperature value of the third temperature detection component can remain unchanged for a certain period of time, that is, the temperature difference between the inlet and outlet coolants of the second flow channel remains constant, it indicates that the cooling capacity output by the refrigerant circulation unit and the cooling capacity required by the coolant circulation unit are balanced with each other, and further indicates that the heat exchange power of the refrigerant circulation unit is adapted to the thermal load of the battery to be tested, that is, the heat load calibration of the battery to be tested and the heat exchange power of the refrigerant circulation unit adapted to it are completed. It can be seen that the battery thermal management test system of the embodiment of the present application facilitates the thermal load calibration of the battery to be tested and the heat exchange power of the refrigerant circulation unit adapted to it.

[0009] In one embodiment, the refrigeration cycle unit further includes a first regulating pipeline and a first regulating valve disposed on the first regulating pipeline;

[0010] The inlet of the first regulating pipeline is connected to the connecting pipeline between the variable frequency compressor and the condenser, and the outlet of the first regulating pipeline is connected to the connecting pipeline between the first flow channel and the expansion valve.

[0011] If the cooling capacity output by the refrigerant circulation unit is too high, the heat added to the inlet of the first flow channel can be fine-tuned by adjusting the first regulating valve, thereby slightly reducing the cooling capacity of the refrigerant entering the first flow channel, thereby achieving fine-tuning of the cooling capacity output by the refrigerant circulation unit, and facilitating the calibration of the heat load of the battery to be tested and the heat exchange power of the refrigerant circulation unit adapted to it.

[0012] In one embodiment, the first regulating channel is a capillary tube.

[0013] In this way, when the high-temperature and high-pressure refrigerant flowing out of the outlet of the variable frequency compressor flows through the first regulating pipeline, the pressure and temperature can be reduced through the capillary tube, thereby reducing the temperature and pressure of the refrigerant flowing through the first regulating pipeline, that is, the heat carried by the refrigerant flowing through the first regulating pipeline is reduced, thereby further facilitating fine-tuning of the cooling capacity of the refrigerant at the inlet of the first flow channel.

[0014] In one embodiment, the refrigeration cycle unit also includes: a fourth temperature detection component and a second pressure detection component, which are arranged on the connecting pipeline between the condenser and the expansion valve; and a first flow detection component, which is arranged on the connecting pipeline between the expansion valve and the first flow channel.

[0015] According to the temperature value detected by the fourth temperature detection component and the pressure value detected by the second pressure detection component, the enthalpy value of the refrigerant in the connecting pipe between the condenser and the expansion valve, that is, the enthalpy value of the refrigerant on the inlet side of the first flow channel, can be calculated. According to the temperature value detected by the first temperature detection component and the pressure value detected by the first pressure detection component, the enthalpy value of the refrigerant on the outlet side of the first flow channel can be calculated. The refrigeration capacity of the refrigerant circulation unit can be calculated by the difference between the enthalpy value of the refrigerant on the outlet side of the first flow channel and the enthalpy value of the refrigerant on the inlet side, that is, the enthalpy difference, and the flow rate of the refrigerant flowing through the first flow channel, that is, the detection value of the first flow detection component, so as to facilitate the calculation of the heat exchange power of the refrigerant circulation unit according to the refrigeration capacity of the refrigerant circulation unit.

[0016] In one embodiment, the cooling liquid circulation unit further includes a second flow detection component, and the second flow detection component is arranged on the cooling liquid circulation pipeline.

[0017] According to the detection results of the second temperature detection component and the third temperature detection component, the temperature difference of the coolant at the inlet and outlet sides of the second flow channel can be obtained; then according to the detection result of the second flow detection component, that is, the flow rate of the coolant flowing through the second flow channel, the cooling capacity of the coolant flowing through the second flow channel, that is, the cooling capacity of the coolant circulation unit, can be calculated.

[0018] According to the cooling capacity of the coolant circulation unit and the cooling capacity of the refrigerant circulation unit, the heat transfer efficiency of the refrigerant circulation unit to the coolant circulation unit can be calculated, thereby facilitating the heat transfer efficiency of the refrigerant circulation unit at different heat exchange powers.

[0019] In one embodiment, the coolant circulation unit includes: a liquid storage container, a liquid outlet and a liquid return port of the liquid storage container are respectively connected to the coolant circulation pipeline; and a heating element, which is arranged in the liquid storage container and is used to heat the coolant in the liquid storage container.

[0020] By heating the coolant in the liquid storage container through the heating element, the heat of the coolant in the liquid storage container can be increased, that is, the heat of the coolant flowing through the second flow channel is increased, so that when the coolant flowing through the second flow channel exchanges heat with the refrigerant flowing through the first flow channel, the cooling capacity required by the second flow channel is increased, thereby achieving a balance between the cooling capacity output by the refrigerant circulation unit and the cooling capacity required by the coolant circulation unit, which is convenient for calibrating the thermal load of the battery to be tested and the heat exchange power of the refrigerant circulation unit adapted to it.

[0021] In one embodiment, the cooling liquid circulation unit includes a liquid storage container and an auxiliary mixing element, and the liquid outlet and liquid return port of the liquid storage container are respectively connected to the cooling liquid circulation pipeline;

[0022] The auxiliary mixing element is located inside the liquid storage container, the auxiliary mixing element and the inner wall of the liquid storage container jointly define a flow cavity, the auxiliary mixing element is sealedly connected to the inner wall of the liquid storage container, the liquid return port of the liquid storage container is arranged on the cavity wall of the flow cavity, and the liquid outlet of the liquid storage container is located outside the flow cavity;

[0023] Wherein, a plurality of flow ports are arranged on the auxiliary mixing element, and the liquid outlet direction of the flow ports is arranged at an angle with the liquid outlet direction of the liquid storage container.

[0024] Since the auxiliary mixing element is sealedly connected to the inner wall of the liquid storage container, and the liquid return port of the liquid storage container is arranged on the cavity wall of the flow cavity, that is, on the area of ​​the liquid storage container used to define the flow cavity, the coolant flowing into the liquid storage container from the liquid return port of the liquid storage container will first flow into the flow cavity, then flow through the multiple flow ports on the auxiliary mixing element and out to other areas of the liquid storage container except the flow cavity, and finally be discharged from the liquid outlet of the liquid storage container into the coolant circulation pipeline.

[0025] In one embodiment, the auxiliary mixing element includes an end plate and a plurality of sequentially connected side plates, wherein the end plate is arranged at the end of the side plate along the extension direction thereof;

[0026] A plurality of flow openings are arranged on the end plate and / or the side plate.

[0027] By providing a plurality of flow openings on the end plate and the side plate respectively, the coolant in the flow chamber can flow out through the flow openings on the side plate and the end plate respectively, thereby facilitating the coolant returning to the liquid storage container to be quickly mixed in other areas of the liquid storage container except the flow chamber.

[0028] In one embodiment, the liquid outflow direction of the overflow port is perpendicular to the liquid outflow direction of the liquid outlet of the liquid storage container.

[0029] In this embodiment, the liquid outlet direction of the flow port is perpendicular to the liquid outlet direction of the liquid storage container, so that the path of the coolant flowing out of the flow port to the liquid outlet of the liquid storage container becomes more tortuous, which is conducive to further sufficient mixing of the coolant flowing out of the flow port in the liquid storage container, thereby further improving the temperature uniformity of the coolant flowing from the liquid storage container to the second flow channel and the temperature uniformity of the coolant flowing to the cold plate of the battery to be tested.

[0030] In one embodiment, the cooling liquid circulation unit includes a liquid storage container; the cooling liquid circulation pipeline includes a first liquid outlet pipeline, a first liquid return pipeline, a second liquid outlet pipeline, and a second liquid return pipeline;

[0031] The liquid inlet of the second flow channel is connected to the liquid storage container through the first liquid outlet pipeline, and the liquid outlet of the second flow channel is connected to the liquid storage container through the first liquid return pipeline;

[0032] The liquid storage container is connected to the liquid inlet of the heat exchange channel of the cold plate of the battery to be tested through the second liquid outlet pipeline, and the liquid storage container is connected to the liquid outlet of the heat exchange channel of the cold plate of the battery to be tested through the second liquid return pipeline.

[0033] The liquid storage container can store a large amount of coolant. For the battery to be tested with a large heat load, the coolant flow rate in the second liquid outlet pipeline and the second liquid return pipeline can be increased so that the large amount of coolant stored in the liquid storage container can be provided to the battery to be tested with a large heat load. At the same time, the coolant flow rate in the first liquid outlet pipeline and the first liquid return pipeline can be increased so that a large amount of coolant can be cooled through the second flow channel and stored in the liquid storage container for use by the battery to be tested with a large heat load.

[0034] In one embodiment, the refrigeration cycle unit further includes a second regulating pipeline and a second regulating valve disposed on the second regulating pipeline;

[0035] The inlet of the second regulating pipeline is connected to the connecting pipeline between the variable frequency compressor and the condenser, and the outlet of the second regulating pipeline is connected to the connecting pipeline between the variable frequency compressor and the first flow channel.

[0036] The flow rate of the refrigerant flowing through the second regulating pipeline can be adjusted by the second regulating valve, thereby adjusting the flow rate of the high-temperature and high-pressure refrigerant mixed into the outlet side of the first flow channel, and then the suction temperature at the return port of the variable frequency compressor can be increased, so that the return port of the variable frequency compressor is in the comfort zone of the suction temperature.

[0037] In one embodiment, the refrigerant cycle unit further includes a third regulating pipeline and a third regulating valve disposed on the third regulating pipeline;

[0038] The inlet of the third regulating pipeline is connected to the connecting pipeline between the condenser and the expansion valve, and the outlet of the third regulating pipeline is connected to the connecting pipeline between the variable frequency compressor and the first flow channel.

[0039] The flow rate of the refrigerant flowing through the third regulating pipeline can be adjusted by the third regulating valve, thereby adjusting the flow rate of the refrigerant mixed into the two-phase zone on the outlet side of the first flow channel, and then the suction temperature at the return port of the variable frequency compressor can be lowered, so that the return port of the variable frequency compressor is in the comfortable zone of the suction temperature.

[0040] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0042] Figure 1 A schematic diagram of a test loop of a battery thermal management test system according to some embodiments of the present application.

[0043] Figure 2 Schematic diagram of the connection structure between the liquid storage container and the auxiliary mixing component in some embodiments of the present application.

[0044] The reference numerals in the specific implementation manner are as follows:

[0045] 110, variable frequency compressor; 120, condenser; 130, expansion valve; 140, evaporator; 141, first flow channel; 142, second flow channel; 151, first temperature detection element; 152, first pressure detection element; 153, fourth temperature detection element; 154, second pressure detection element; 155, first flow detection element; 161, first regulating pipeline; 1611, first regulating valve; 162, second regulating pipeline; 1621, second regulating valve; 163, third regulating pipeline; 1631, third regulating valve;

[0046] 210, cooling liquid circulation pipeline; 211, first liquid outlet pipeline; 212, first liquid return pipeline; 213, second liquid outlet pipeline; 214, second liquid return pipeline; 220, circulation power component; 221, first circulation power component; 222, second circulation power component; 231, second temperature detection component; 232, third temperature detection component; 233, second flow detection component; 240, liquid storage container; 241, liquid outlet Inlet; 2411, first liquid outlet; 2412, second liquid outlet; 242, return liquid outlet; 2421, first return liquid outlet; 2422, second return liquid outlet; 250, liquid replenishment container; 251, liquid replenishment pipeline; 252, liquid replenishment power part; 260, heating part; 261, liquid level detection part; 270, auxiliary mixing part; 270a, flow chamber; 2701, flow outlet; 271, end plate; 272, side plate. DETAILED DESCRIPTION

[0047] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0048] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0049] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0050] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0051] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0052] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0053] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0054] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0055] At present, from the perspective of market development, the application of batteries is becoming more and more extensive. Batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of battery application areas, its market demand is also constantly expanding.

[0056] Batteries usually need to undergo thermal management testing after production is completed. The battery thermal management test system includes a refrigerant circulation unit and a coolant circulation unit. When performing a thermal management test on the battery, the outflow port of the coolant circulation unit is connected to the inflow port of the heat exchange channel of the cold plate of the battery to be tested, and the return port of the coolant circulation unit is connected to the outflow port of the heat exchange channel of the cold plate of the battery to be tested, so as to form a coolant circulation loop. While the coolant circulates in the coolant circulation unit, it can cool down the cold plate of the battery to be tested. The refrigerant circulation unit is used to cool the refrigerant, and while the refrigerant circulates in the refrigerant circulation unit, it can transfer cold energy to the coolant in the coolant circulation loop, thereby cooling down the coolant.

[0057] The battery thermal management test system in the related art mainly adjusts the flow rate of the coolant in the coolant circulation loop and controls the temperature of the coolant in the coolant circulation loop for the batteries under test with different thermal loads, so that the heat exchange power of the coolant circulation unit matches the thermal load of the battery under test. The battery thermal management test system in the related art cannot calibrate the heat exchange power of the refrigerant circulation unit adapted to the thermal load of the battery under test.

[0058] Based on the above considerations, the present application provides a battery thermal management test system, which adjusts the cooling capacity output by the refrigerant circulation unit through a variable frequency compressor, that is, adjusts the heat exchange power of the refrigerant circulation unit. The current temperature and current pressure of the refrigerant at the outflow outlet of the first flow channel are detected by the first temperature detection member and the first pressure detection member. According to the current pressure, the saturation temperature corresponding to the current pressure can be determined; at the same time, the current temperature of the refrigerant at the outflow outlet of the first flow channel detected by the first temperature detection member is compared with the saturation temperature. If the current temperature slightly exceeds the saturation temperature, it indicates that the latent cooling capacity of the refrigerant flowing out of the first flow channel has been completely released; at the same time, if the temperature difference between the temperature value detected by the second temperature detection member and the temperature value of the third temperature detection member can be kept constant for a certain period of time, it indicates that the cooling capacity output by the refrigerant circulation unit and the cooling capacity required by the coolant circulation unit are balanced with each other, and then it indicates that the heat exchange power of the refrigerant circulation unit is suitable for the thermal load of the battery to be tested. It can be seen that through the battery thermal management test system of the embodiment of the present application, it is convenient to calibrate the heat load of the battery to be tested and the heat exchange power of the refrigerant circulation unit adapted to it.

[0059] Figure 1 A schematic diagram of a test loop of a battery thermal management test system according to some embodiments of the present application is shown. Figure 1A battery thermal management test system provided in an embodiment of the present application includes a refrigerant circulation unit and a coolant circulation unit. The refrigerant circulation unit includes a variable frequency compressor 110, a condenser 120, an expansion valve 130, and an evaporator 140 connected in sequence through pipelines. The evaporator 140 includes a first flow channel 141 and a second flow channel 142 isolated from each other, and both ends of the first flow channel 141 are respectively connected to the expansion valve 130 and the variable frequency compressor 110.

[0060] The refrigeration cycle unit further includes a first temperature detection component 151 and a first pressure detection component 152 . The first temperature detection component 151 and the first pressure detection component 152 are arranged on the connecting pipeline between the first flow channel 141 and the variable frequency compressor 110 .

[0061] The cooling liquid circulation unit includes a cooling liquid circulation pipeline 210, and both ends of the second flow channel 142 are respectively connected to the liquid outlet and the liquid return port of the cooling liquid circulation pipeline 210. The cooling liquid circulation unit also includes a second temperature detection member 231 and a third temperature detection member 232. The second temperature detection member 231 is arranged on the cooling liquid circulation pipeline 210 and located at the liquid inlet of the second flow channel 142. The third temperature detection member 232 is arranged on the cooling liquid circulation pipeline 210 and located at the liquid outlet of the second flow channel 142.

[0062] Specifically, the cooling liquid circulation pipeline 210 has two liquid outlets and two liquid return ports. The liquid inlet of the second flow channel 142 is connected to the first liquid outlet of the cooling liquid circulation pipeline 210, and the liquid outlet of the second flow channel 142 is connected to the first liquid return port of the cooling liquid circulation pipeline 210. The second liquid outlet of the cooling liquid circulation pipeline 210 is used to connect to the liquid inlet of the heat exchange channel of the cold plate of the battery 10 to be tested, and the second liquid return port of the cooling liquid circulation pipeline 210 is used to connect to the liquid outlet of the heat exchange channel of the cold plate of the battery 10 to be tested, so that the second flow channel 142, the cooling liquid circulation pipeline 210, and the heat exchange channel of the cold plate of the battery 10 to be tested are connected to each other in sequence to form a cooling liquid circulation loop.

[0063] The coolant circulation unit also includes a circulating power part 220, which drives the coolant to circulate, so that the coolant can continue to circulate along the heat exchange channel of the cold plate of the battery 10 to be tested, the coolant circulation pipeline 210 and the second flow channel 142. When the coolant flows through the heat exchange channel of the cold plate of the battery 10 to be tested, it can exchange heat with the cold plate of the battery 10 to be tested, thereby dissipating heat and cooling the battery to be tested. When the coolant flows out of the heat exchange channel of the cold plate of the battery 10 to be tested, the temperature rises, and enters the second flow channel 142 through the coolant circulation pipeline 210. The circulating power part 220 is, for example, a circulating pump.

[0064] The inlet of the first flow channel 141 is connected to the outlet of the expansion valve 130, and the outlet of the first flow channel 141 is connected to the return port of the variable frequency compressor 110. The first flow channel 141 and the second flow channel 142 can perform heat exchange with each other, so the refrigerant flowing through the first flow channel 141 can perform heat exchange with the coolant flowing through the second flow channel 142.

[0065] The process of refrigerant circulation in the refrigerant cycle unit is as follows: the high-temperature and high-pressure gaseous refrigerant output by the variable frequency compressor 110 flows to the condenser 120, and the gaseous refrigerant becomes a two-phase state after being reduced in pressure and temperature by the condenser 120, and flows to the first flow channel 141 after being further reduced in temperature and pressure by the expansion valve 130. In the process of the refrigerant flowing through the first flow channel 141, the cold amount can be transferred to the coolant in the second flow channel 142, and at the same time, the heat of the coolant in the second flow channel 142 is transferred to the refrigerant in the first flow channel 141, so that the coolant flowing through the second flow channel 142 can be cooled down, and the temperature of the refrigerant flowing out of the first flow channel 141 increases and flows back to the variable frequency compressor 110. The coolant flowing through the second flow channel 142 enters the coolant circulation pipeline 210 after cooling down, so that it can enter the heat exchange channel of the cold plate of the battery 10 to be tested through the coolant circulation pipeline 210 to cool down the battery 10 to be tested. The two ends of the second flow channel 142 are respectively connected to the liquid outlet and the liquid return port of the coolant circulation pipeline 210. The circulating power component 220 is arranged on the coolant circulation pipeline 210 and is used to drive the coolant to circulate.

[0066] The first temperature detection member 151 can detect the temperature of the refrigerant at the outlet of the first flow channel 141, and the first pressure detection member 152 can detect the pressure of the refrigerant at the outlet of the first flow channel 141. The first temperature detection member 151 is, for example, a temperature sensor, etc. The first pressure detection member 152 is, for example, a pressure sensor, etc.

[0067] The second temperature detection member 231 can detect the temperature of the coolant at the liquid inlet of the second flow channel 142, and the third temperature detection member 232 can detect the temperature of the coolant at the liquid outlet of the second flow channel 142. The second temperature detection member 231 is, for example, a temperature sensor, etc. The third temperature detection member 232 is, for example, a temperature sensor, etc.

[0068] When the above-mentioned battery thermal management test system calibrates the heat load of the battery 10 to be tested and the heat exchange power of the refrigerant cycle unit adapted thereto, the operating frequency of the variable frequency compressor 110 can be adjusted to adjust the cooling capacity output by the refrigerant cycle unit, and then the cooling capacity transferred from the refrigerant flowing through the first flow channel 141 to the coolant in the second flow channel 142 can be adjusted, that is, the heat exchange power of the refrigerant cycle unit is adjusted. The current temperature and current pressure of the refrigerant at the outlet of the first flow channel 141 are detected by the first temperature detection component 151 and the first pressure detection component 152. According to the current pressure of the refrigerant at the outlet of the first flow channel 141 detected by the first pressure detection component 152, the saturation temperature corresponding to the current pressure can be determined; at the same time, the current temperature of the refrigerant at the outlet of the first flow channel 141 detected by the first temperature detection component 151 is compared with the saturation temperature. If the current temperature slightly exceeds the saturation temperature (for example, exceeds 1°C~2°C), it indicates that the latent cooling capacity of the refrigerant flowing out of the first flow channel 141 has been completely released; at the same time, if the temperature difference between the temperature value detected by the second temperature detection component 231 and the temperature value of the third temperature detection component 232 can remain unchanged for a certain period of time (for example, 5min~10min) (that is, the temperature difference between the inlet and outlet coolants of the second flow channel 142 remains constant), it indicates that the cooling capacity output by the refrigerant circulation unit and the cooling capacity required by the coolant circulation unit are balanced with each other, and further indicates that the heat exchange power of the refrigerant circulation unit is adapted to the thermal load of the battery 10 to be tested, that is, the heat load calibration of the battery 10 to be tested and the heat exchange power of the refrigerant circulation unit adapted thereto are completed. It can be seen that, through the battery thermal management test system of the embodiment of the present application, it is convenient to calibrate the heat load of the battery 10 to be tested and the heat exchange power of the refrigerant circulation unit adapted thereto.

[0069] It can be understood that before calibrating the heat load of the battery 10 to be tested and the heat exchange power of the refrigeration cycle unit adapted thereto, the corresponding relationship between the evaporation pressure of the refrigerant at the outlet of the first flow channel 141 and the corresponding saturation temperature can be pre-calibrated. In this way, according to the current pressure of the refrigerant at the outlet of the first flow channel 141 detected by the first pressure detection element 152, the saturation temperature corresponding to the current pressure can be determined.

[0070] When the current temperature of the refrigerant at the outlet of the first flow channel 141 detected by the first temperature detection element 151 is compared with the saturation temperature, if the current temperature exceeds the saturation temperature by too much (for example, by more than 5°C), it indicates that the cooling capacity output by the refrigerant circulation unit is insufficient. At this time, the cooling capacity output by the refrigerant circulation unit can be increased by adjusting the working frequency of the variable frequency compressor 110. When the current temperature slightly exceeds the saturation temperature and the temperature difference between the inlet and outlet coolants of the second flow channel 142 remains constant for a certain period of time, it indicates that the heat exchange power of the refrigerant circulation unit is compatible with the heat load of the battery 10 to be tested.

[0071] When the current temperature of the refrigerant at the outlet of the first flow channel 141 detected by the first temperature detection element 151 is compared with the saturation temperature, if the current temperature is equal to the saturation temperature, it indicates that the refrigerant at the outlet of the first flow channel 141 is in the two-phase region, that is, it indicates that the cooling capacity output by the refrigerant circulation unit is too much (exceeding the cooling capacity required by the coolant circulation unit). At this time, the cooling capacity output by the refrigerant circulation unit can be reduced by adjusting the working frequency of the variable frequency compressor 110. Until the current temperature slightly exceeds the saturation temperature, and the temperature difference between the inlet and outlet coolants of the second flow channel 142 remains constant for a certain period of time, it indicates that the heat exchange power of the refrigerant circulation unit is compatible with the heat load of the battery 10 to be tested.

[0072] Please refer to Figure 1 In one embodiment, the refrigeration cycle unit further includes a first regulating pipeline 161 and a first regulating valve 1611 disposed on the first regulating pipeline 161 .

[0073] The inlet of the first regulating pipeline 161 is connected to the connecting pipeline between the variable frequency compressor 110 and the condenser 120 , and the outlet of the first regulating pipeline 161 is connected to the connecting pipeline between the first flow channel 141 and the expansion valve 130 .

[0074] As analyzed above, when the above-mentioned battery thermal management test system calibrates the heat load of the battery 10 to be tested and the heat exchange power of the refrigerant circulation unit adapted thereto, if the cooling capacity output by the refrigerant circulation unit is too much, the cooling capacity output by the refrigerant circulation unit can be reduced by adjusting the operating frequency of the variable frequency compressor 110. After adjusting the operating frequency of the variable frequency compressor 110, if the cooling capacity output by the refrigerant circulation unit is still too much (for example, the refrigerant at the outlet of the first flow channel 141 is in the two-phase zone, but is about to enter the overheating zone). At this time, the cooling capacity output by the refrigerant circulation unit can be fine-tuned by the first regulating valve 1611.

[0075] Specifically, since the inlet of the first regulating pipeline 161 is connected to the connecting pipeline between the variable frequency compressor 110 and the condenser 120, and the outlet of the first regulating pipeline 161 is connected to the connecting pipeline between the first flow channel 141 and the variable frequency compressor 110, the high-temperature and high-pressure refrigerant flowing out of the outlet of the variable frequency compressor 110 can flow to the connecting pipeline between the first flow channel 141 and the expansion valve 130 through the first regulating pipeline 161. In this way, a certain amount of refrigerant from the outlet of the expansion valve 130 can be mixed in the process of flowing to the inlet of the first flow channel 141, so that a certain amount of heat can be added to the refrigerant flowing into the first flow channel 141.

[0076] If the cooling capacity output by the refrigerant circulation unit is too high, the heat added to the inlet of the first flow channel 141 can be fine-tuned by adjusting the first regulating valve 1611, thereby slightly reducing the cooling capacity of the refrigerant entering the first flow channel 141, thereby achieving fine-tuning of the cooling capacity output by the refrigerant circulation unit, and facilitating the calibration of the heat load of the battery 10 to be tested and the heat exchange power of the refrigerant circulation unit adapted to it.

[0077] In one embodiment, the first regulating pipeline 161 is a capillary tube.

[0078] In this way, when the high-temperature and high-pressure refrigerant flowing out of the outlet of the variable frequency compressor 110 flows through the first regulating pipeline 161, it can be depressurized and cooled through the capillary tube, thereby reducing the temperature and pressure of the refrigerant flowing through the first regulating pipeline 161, that is, the heat carried by the refrigerant flowing through the first regulating pipeline 161 is reduced, thereby further facilitating fine-tuning of the cooling capacity of the refrigerant at the inlet of the first flow channel 141.

[0079] Please refer to Figure 1 In one embodiment, the refrigeration cycle unit further includes a fourth temperature detection member 153, a second pressure detection member 154, and a first flow detection member 155. The fourth temperature detection member 153 and the second pressure detection member 154 are disposed on the connecting pipe between the condenser 120 and the expansion valve 130. The first flow detection member 155 is disposed on the connecting pipe between the expansion valve 130 and the first flow channel 141.

[0080] The fourth temperature detecting member 153 may be a temperature sensor. The second pressure detecting member 154 may be a pressure sensor. The first flow detecting member 155 may be a flow meter. The fourth temperature detecting member 153 is capable of detecting the temperature of the refrigerant in the connecting pipe between the condenser 120 and the expansion valve 130. The second pressure detecting member 154 is capable of detecting the pressure of the refrigerant in the connecting pipe between the condenser 120 and the expansion valve 130. The first flow detecting member 155 is capable of detecting the flow of the refrigerant in the connecting pipe between the expansion valve 130 and the first flow channel 141.

[0081] According to the temperature value detected by the fourth temperature detection element 153 and the pressure value detected by the second pressure detection element 154, the enthalpy value h1 of the refrigerant in the connecting pipeline between the condenser 120 and the expansion valve 130 (i.e., the enthalpy value h1 of the refrigerant at the inlet side of the first flow channel 141) can be calculated. According to the temperature value detected by the first temperature detection element 151 and the pressure value detected by the first pressure detection element 152, the enthalpy value h2 of the refrigerant at the outlet side of the first flow channel 141 can be calculated. The difference between the enthalpy value h2 of the refrigerant at the outlet side of the first flow channel 141 and the enthalpy value h1 of the refrigerant at the inlet side (i.e., the enthalpy difference) and the flow rate of the refrigerant flowing through the first flow channel 141 (i.e., the detection value of the first flow detection element 155) can be used to calculate the cooling capacity Q1 of the refrigerant circulation unit, thereby facilitating the calculation of the heat exchange power of the refrigerant circulation unit based on the cooling capacity Q1 of the refrigerant circulation unit.

[0082] Please refer to Figure 1 In one embodiment, the coolant circulation unit further includes a second flow detection element 233 , and the second flow detection element 233 is disposed on the coolant circulation pipeline 210 .

[0083] The second flow detection element 233 may be a flow meter. According to the detection results of the second temperature detection element 231 and the third temperature detection element 232, the temperature difference of the coolant at the inlet and outlet sides of the second flow channel 142 can be obtained; and according to the detection result of the second flow detection element 233 (i.e., the flow rate of the coolant flowing through the second flow channel 142), the cooling amount Q2 of the coolant flowing through the second flow channel 142, i.e., the cooling amount Q2 of the coolant circulation unit, can be calculated.

[0084] According to the cooling capacity Q2 of the coolant circulation unit and the cooling capacity Q1 of the refrigerant circulation unit, the heat transfer efficiency of the refrigerant circulation unit to the coolant circulation unit can be calculated, thereby facilitating the heat transfer efficiency of the refrigerant circulation unit at different heat exchange powers.

[0085] Please refer to Figure 1 In one embodiment, the coolant circulation unit includes a liquid storage container 240 and a heating element 260. The liquid outlet and the liquid return port of the liquid storage container 240 are respectively connected to the coolant circulation pipeline 210. The heating element 260 is disposed in the liquid storage container 240 and is used to heat the coolant in the liquid storage container 240.

[0086] Specifically, since the liquid outlet and the liquid return port of the liquid storage container 240 are respectively connected to the coolant circulation pipeline 210, when the circulating power member 220 drives the coolant circulation, the coolant can circulate along the coolant circulation pipeline 210, the liquid storage container 240, the second flow channel 142 and the heat exchange channel of the cold plate of the battery to be tested 10. The heating member 260 can be an electric heater or the like.

[0087] As analyzed above, when the above-mentioned battery thermal management test system calibrates the heat load of the battery 10 to be tested and the heat exchange power of the refrigerant circulation unit adapted thereto, if the cooling capacity output by the refrigerant circulation unit is too much, the cooling capacity output by the refrigerant circulation unit can be reduced by adjusting the operating frequency of the variable frequency compressor 110. After adjusting the operating frequency of the variable frequency compressor 110, if the cooling capacity output by the refrigerant circulation unit is still too much (for example, the refrigerant at the outlet of the first flow channel 141 is in the two-phase zone, but is about to enter the overheating zone); at this time, the heating element 260 can also be used to fine-tune the cooling capacity required by the coolant circulation unit.

[0088] By heating the coolant in the liquid storage container 240 through the heating element 260, the heat of the coolant in the liquid storage container 240 can be increased, that is, the heat of the coolant flowing through the second flow channel 142 is increased, so that when the coolant flowing through the second flow channel 142 exchanges heat with the refrigerant flowing through the first flow channel 141, the cooling capacity required by the second flow channel 142 is increased, thereby achieving a balance between the cooling capacity output by the refrigerant circulation unit and the cooling capacity required by the coolant circulation unit, which is convenient for calibrating the heat load of the battery 10 to be tested and the heat exchange power of the refrigerant circulation unit adapted to it.

[0089] Please refer to Figure 2 In one embodiment, the cooling liquid circulation unit includes a liquid storage container 240 and an auxiliary mixing element 270 , and the liquid outlet 241 and the liquid return port 242 of the liquid storage container 240 are respectively connected to the cooling liquid circulation pipeline 210 .

[0090] The auxiliary mixing element 270 is located inside the liquid storage container 240. The auxiliary mixing element 270 and the inner wall of the liquid storage container 240 define a flow cavity 270a together. The auxiliary mixing element 270 is sealedly connected to the inner wall of the liquid storage container 240. The liquid return port 242 of the liquid storage container 240 is arranged on the cavity wall of the flow cavity 270a. The liquid outlet 241 of the liquid storage container 240 is located outside the flow cavity 270a. The auxiliary mixing element 270 is provided with a plurality of flow ports 2701.

[0091] The liquid outflow direction A1 of the flow port 2701 and the liquid outflow direction A2 of the liquid outlet 241 of the liquid storage container 240 are arranged at an angle.

[0092] Since the liquid outlet 241 and the liquid return port 242 of the liquid storage container 240 are respectively connected to the cooling liquid circulation pipeline 210, the cooling liquid cooled after flowing through the second flow channel 142 and the cooling liquid heated after flowing through the cold plate of the battery 10 to be tested can flow back into the liquid storage container 240 through the liquid return port 242 of the liquid storage container 240. After the refluxed cooling liquid is evenly mixed in the liquid storage container 240, the cooling liquid flows out into the cooling liquid circulation pipeline 210 through the liquid outlet 241 of the liquid storage container 240, so that it can flow to the second flow channel 142 for cooling and to the cold plate of the battery 10 to be tested and to dissipate the heat of the battery 10 to be tested.

[0093] Since the auxiliary mixing element 270 is sealedly connected to the inner wall of the liquid storage container 240, and the return liquid port 242 of the liquid storage container 240 is arranged on the cavity wall of the flow cavity 270a (that is, arranged on the area of ​​the liquid storage container 240 used to define the flow cavity 270a), the coolant flowing into the liquid storage container 240 from the return liquid port 242 of the liquid storage container 240 will first flow into the flow cavity 270a, and then flow through the multiple flow ports 2701 on the auxiliary mixing element 270 and out to other areas in the liquid storage container 240 (except the flow cavity 270a), and finally be discharged from the liquid outlet 241 of the liquid storage container 240 into the coolant circulation pipeline 210.

[0094] It can be understood that the coolant entering the flow cavity 270a from the liquid return port 242 has two sources, one is the heated coolant flowing through the heat exchange channel of the cold plate of the battery 10 to be tested, and the other is the cooled coolant flowing through the second flow channel 142.

[0095] In the embodiment of the present application, since the liquid outlet direction A1 of the flow port 2701 is set at an angle with the liquid outlet direction A2 of the liquid outlet 241 of the liquid storage container 240, the coolant flowing out from the flow port 2701 along the liquid outlet direction A1 to other areas in the liquid storage container 240 (except the flow cavity 270a) is not easy to flow out directly through the liquid outlet 241 of the liquid storage container 240 along the liquid outlet direction A2; instead, it first flows along the liquid outlet direction A1 to be mixed to a certain extent with the coolant in other areas in the liquid storage container 240 (except the flow cavity 270a). The mixed coolant is then discharged from the liquid outlet 241 of the liquid storage container 240 into the coolant circulation pipeline 210 along the liquid outlet direction A2, which is beneficial to improving the temperature uniformity of the coolant discharged from the liquid outlet 241 of the liquid storage container 240 into the coolant circulation pipeline 210, that is, it is beneficial to improve the temperature uniformity of the coolant from the liquid storage container 240 flowing to the second flow channel 142 and the temperature uniformity of the coolant flowing to the cold plate of the battery 10 to be tested.

[0096] Please refer to Figure 2In one embodiment, the auxiliary mixing element 270 includes an end plate 271 and a plurality of sequentially connected side plates 272, wherein the end plate 271 is disposed at the end of the side plate 272 along its extension direction, and the end plate 271 and the side plate 272 are disposed at an angle. A plurality of flow ports 2701 are respectively disposed on the end plate 271 and the side plate 272.

[0097] Specifically, the end plate 271 and the plurality of side plates 272 enclose an open space, the open side of which faces the inner wall of the liquid storage container 240, so that the plurality of side plates 272, the end plate 271 and the inner wall of the liquid storage container 240 can jointly define a flow chamber 270a. Figure 2 In the illustrated embodiment, the end plate 271 and the side plate 272 are respectively connected to the inner wall of the liquid storage container 240.

[0098] By respectively providing a plurality of flow ports 2701 on the end plate 271 and the side plate 272, the coolant in the flow chamber 270a can flow out through the flow ports 2701 on the side plate 272 and the end plate 271, respectively, thereby facilitating the coolant returning to the liquid storage container 240 to be quickly mixed in other areas of the liquid storage container 240 (except the flow chamber 270a).

[0099] In other embodiments, the flow openings may be provided on the side plates, but not on the end plates. The flow openings may be provided on the end plates, but not on the side plates.

[0100] In other embodiments, multiple side plates may surround the end plate, and the multiple side plates are connected end to end in sequence, and the ends of the multiple side plates away from the end plate are respectively connected to the inner wall of the liquid storage container, and the end plate and the inner wall of the liquid storage container used to define the flow cavity are arranged opposite to each other. In this way, the multiple side plates, the end plate and the inner wall of the liquid storage container can also define a flow cavity.

[0101] Please refer to Figure 2 In one embodiment, the number of the end plates 271 is two, and the two end plates 271 are respectively arranged at the two ends of the side plate 272 along the extension direction thereof.

[0102] Please refer to Figure 2 In one embodiment, the side wall of the liquid storage container 240 is cylindrical. One side edge of the end plate 271 connected to the side wall of the liquid storage container 240 is arc-shaped, and the end plate 271 is sealed and connected to the side wall of the liquid storage container 240. The other sides of the end plate 271 are connected to the side plates 272 respectively.

[0103] Specifically, the other sides of the end plate 271 (except the arc-shaped side) are respectively connected to a side plate 272. The extension direction of the side plate 272 is along the axial direction of the liquid storage container 240. Figure 2In the illustrated embodiment, the end plate 271 has two side edges in addition to the arc-shaped side edge, and the two side edges are respectively connected to a side plate 272. The two side edges of the end plate 271 are arranged at an angle, and the two side plates 272 are arranged at an angle.

[0104] Since the arc-shaped side of the end plate 271 is adapted to the shape of the side wall of the liquid storage container 240, the end plate 271 is conveniently sealed with the side wall of the liquid storage container 240. The other side edges of the end plate 271 are respectively connected to the side plates 272, so that the inner wall of the multiple side plates 272, the end plate 271 and the liquid storage container 240 can jointly define a flow chamber 270a.

[0105] In other embodiments, the shape of the liquid storage container may also be other shapes such as square. The number of the side panels may also be three, four, or more.

[0106] Please refer to Figure 1 In one embodiment, the liquid outflow direction A1 of the flow port 2701 is perpendicular to the liquid outflow direction A2 of the liquid outlet 241 of the liquid storage container 240 .

[0107] In this way, the coolant flowing out from the flow port 2701 is less likely to flow directly to the liquid outlet 241 of the liquid storage container 240, but first flows along the liquid outlet direction A1, so as to be fully mixed in the coolant in the liquid storage container 240, and finally the mixed coolant flows to the liquid outlet 241 of the liquid storage container 240.

[0108] In this embodiment, the liquid outlet direction A1 of the flow port 2701 is perpendicular to the liquid outlet direction A2 of the liquid outlet 241 of the liquid storage container 240, so that the path of the coolant flowing out of the flow port 2701 to the liquid outlet 241 of the liquid storage container 240 becomes more tortuous, which is conducive to further sufficient mixing of the coolant flowing out of the flow port 2701 in the liquid storage container 240, thereby further improving the temperature uniformity of the coolant flowing from the liquid storage container 240 to the second flow channel 142 and the temperature uniformity of the coolant flowing to the cold plate of the battery 10 to be tested.

[0109] In other embodiments, the angle between the liquid outlet direction A1 of the flow port 2701 and the liquid outlet direction A2 of the liquid outlet 241 of the liquid storage container 240 may also be an acute angle or an obtuse angle.

[0110] Please refer to Figure 2 In one embodiment, the plate thickness direction of the end plate 271 is along the axial direction of the liquid storage container 240, so the liquid outlet direction A1 of the flow port 2701 on the end plate 271 is along the axial direction of the liquid storage container 240. The plate thickness direction of the side plate 272 is perpendicular to the axial direction of the liquid storage container 240, and the liquid outlet direction A1 of the flow port 2701 on the side plate 272 is perpendicular to the axial direction of the liquid storage container 240.

[0111] Please refer to Figure 1 In one embodiment, the cooling liquid circulation unit includes a liquid storage container 240. The cooling liquid circulation pipeline 210 includes a first liquid outlet pipeline 211, a first liquid return pipeline 212, a second liquid outlet pipeline 213, and a second liquid return pipeline 214.

[0112] The liquid inlet of the second flow channel 142 is communicated with the first liquid outlet 2411 of the liquid storage container 240 through the first liquid outlet pipeline 211 , and the liquid outlet of the second flow channel 142 is communicated with the first liquid return port 2421 of the liquid storage container 240 through the first liquid return pipeline 212 .

[0113] The second liquid outlet 2412 of the liquid storage container 240 is connected to the liquid inlet of the heat exchange channel of the cold plate of the battery under test through the second liquid outlet pipeline 213, and the second liquid return port 2422 of the liquid storage container 240 is connected to the liquid outlet of the heat exchange channel of the cold plate of the battery under test 10 through the second liquid return pipeline 214.

[0114] The liquid storage container 240 provides cooling liquid to the cold plate of the battery 10 to be tested through the second liquid outlet pipeline 213. After the cooling liquid flows through the heat exchange channel of the cold plate of the battery 10 to be tested to cool the battery 10 to be tested, it flows back to the liquid storage container 240 through the second liquid return pipeline 214. The cooling liquid in the liquid storage container 240 flows to the liquid inlet of the second flow channel 142 through the first liquid outlet pipeline 211. After the cooling liquid flows through the second flow channel 142, it cools down and then flows into the liquid storage container 240 through the first liquid return pipeline 212.

[0115] A circulating power part 220 can be set on any of the first liquid outlet pipeline 211, the first liquid return pipeline 212, the second liquid outlet pipeline 213, and the second liquid return pipeline 214, so that the coolant can circulate in the second flow channel 142, the coolant circulation pipeline 210, the liquid storage container 240 and the cold plate of the battery 10 to be tested.

[0116] In this embodiment, a liquid storage container 240 is provided, and the liquid storage container 240 is connected to the second flow channel 142 through the first liquid outlet pipeline 211 and the first liquid return pipeline 212, and the liquid storage container 240 is connected to the cold plate of the battery 10 to be tested through the second liquid outlet pipeline 213 and the second liquid return pipeline 214.

[0117] The liquid storage container 240 can store a large amount of coolant. For the battery 10 to be tested with a large heat load, the coolant flow rate in the second liquid outlet pipeline 213 and the second liquid return pipeline 214 can be increased, so that the large amount of coolant stored in the liquid storage container 240 can be provided to the battery 10 to be tested with a large heat load. At the same time, the coolant flow rate in the first liquid outlet pipeline 211 and the first liquid return pipeline 212 can be increased, so that more coolant can be stored in the liquid storage container 240 after being cooled through the second flow channel 142, so as to be used by the battery 10 to be tested with a large heat load.

[0118] Please refer to Figure 1 For example, the number of circulating power components 220 in the coolant circulation unit is two, namely a first circulating power component 221 and a second circulating power component 222. The first circulating power component 221 is disposed on the second liquid outlet pipeline 213. The second circulating power component 222 is disposed on the first liquid outlet pipeline 211.

[0119] In other embodiments, a circulating power member may be provided on the first liquid return pipeline. A circulating power member may also be provided on the second liquid return pipeline. The number of circulating power members may be one, three or other numbers.

[0120] Please refer to Figure 2 In one embodiment, the first liquid return port 2421 and the second liquid return port 2422 of the liquid storage container 240 are respectively disposed on the cavity wall of the flow cavity 270a, that is, disposed in the area of ​​the liquid storage container 240 used to define the flow cavity 270a. The first liquid outlet 2411 of the liquid storage container 240 and the second liquid outlet 2412 of the liquid storage container 240 are respectively disposed outside the flow cavity 270a.

[0121] Please refer to Figure 1 In one embodiment, the refrigeration cycle unit further includes a second regulating pipeline 162 and a second regulating valve 1621 disposed on the second regulating pipeline 162 .

[0122] The inlet of the second regulating pipeline 162 is connected to the connecting pipeline between the variable frequency compressor 110 and the condenser 120 , and the outlet of the second regulating pipeline 162 is connected to the connecting pipeline between the variable frequency compressor 110 and the first flow channel 141 .

[0123] In this embodiment, the high-temperature and high-pressure refrigerant output by the variable frequency compressor 110 can flow to the connecting pipeline between the return port of the variable frequency compressor 110 and the outflow port of the first flow channel 141 through the second regulating pipeline 162, and then flow back to the return port of the variable frequency compressor 110 through the connecting pipeline. That is, the refrigerant from the outflow port of the variable frequency compressor 110 can be mixed with the refrigerant flowing out of the outflow port of the first flow channel 141 and then flow back to the return port of the variable frequency compressor 110.

[0124] The flow rate of the refrigerant flowing through the second regulating pipeline 162 can be adjusted by the second regulating valve 1621, thereby adjusting the flow rate of the high-temperature and high-pressure refrigerant mixed into the outlet side of the first flow channel 141, and then the suction temperature at the return port of the variable frequency compressor 110 can be increased, so that the return port of the variable frequency compressor 110 is in the comfort zone of the suction temperature.

[0125] Please refer to Figure 1In one embodiment, the refrigeration cycle unit further includes a third regulating pipeline 163 and a third regulating valve 1631 disposed on the third regulating pipeline 163 .

[0126] The inlet of the third regulating pipeline 163 is connected to the connecting pipeline between the condenser 120 and the expansion valve 130 , and the outlet of the third regulating pipeline 163 is connected to the connecting pipeline between the variable frequency compressor 110 and the first flow channel 141 .

[0127] In this embodiment, the refrigerant in the two-phase region output by the condenser 120 can flow to the connecting pipeline between the return port of the variable frequency compressor 110 and the outflow port of the first flow channel 141 through the third regulating pipeline 163, and then flow back to the return port of the variable frequency compressor 110 through the connecting pipeline. That is, the refrigerant in the two-phase region output from the condenser 120 can be mixed with the refrigerant flowing out of the outflow port of the first flow channel 141 and then flow back to the return port of the variable frequency compressor 110.

[0128] The flow rate of the refrigerant flowing through the third regulating pipeline 163 can be adjusted by the third regulating valve 1631, so that the flow rate of the refrigerant mixed into the two-phase zone on the outlet side of the first flow channel 141 can be adjusted, and then the suction temperature at the return port of the variable frequency compressor 110 can be lowered, so that the return port of the variable frequency compressor 110 is in the comfortable zone of the suction temperature.

[0129] Please refer to Figure 1 In one embodiment, the coolant circulation unit also includes a liquid replenishment container 250, a liquid replenishment pipeline 251 and a liquid replenishment power component 252. The liquid replenishment container 250 is used to store coolant. The liquid replenishment container 250 is connected to the liquid storage container 240 through the liquid replenishment pipeline 251, and the liquid replenishment power component 252 is arranged on the liquid replenishment pipeline 251.

[0130] For different specifications of the battery 10 to be tested, the flow rate of the coolant flowing in the heat exchange channel of the cold plate is different. Therefore, when more coolant flows from the liquid storage container 240 into the cold plate of the battery 10 to be tested through the coolant circulation pipeline 210, the coolant in the liquid storage container 240 may be insufficient.

[0131] When the coolant in the liquid storage container 240 is insufficient, the coolant in the liquid replenishing container 250 can be driven by the liquid replenishing power member 252 to flow along the liquid replenishing pipeline 251 into the liquid storage container 240 to replenish the coolant in the liquid storage container 240.

[0132] Please refer to Figure 1 In one embodiment, the coolant circulation unit further includes an expansion tank 253 , which is disposed on the liquid replenishing pipeline 251 and is used to balance the pressure in the liquid replenishing pipeline 251 .

[0133] Please refer to Figure 1In one embodiment, the cooling liquid circulation unit further includes a one-way valve 254. The one-way valve 254 is disposed on the liquid replenishing pipeline 251 to prevent the cooling liquid in the liquid replenishing pipeline 251 from flowing back.

[0134] Please refer to Figure 1 In one embodiment, the coolant circulation unit further includes a liquid level detection member 261. The liquid level detection member 261 is, for example, a liquid level meter, a liquid level sensor, etc. The liquid level detection member 261 is disposed in the liquid storage container 240 and is used to detect the liquid level in the liquid storage container 240, so as to facilitate timely replenishment of the coolant according to the liquid level in the liquid storage container 240.

[0135] A battery thermal management test system provided in an embodiment of the present application includes a refrigerant circulation unit and a coolant circulation unit. The refrigerant circulation unit includes a variable frequency compressor 110, a condenser 120, an expansion valve 130 and an evaporator 140 connected in sequence through pipelines. The evaporator 140 includes a first flow channel 141 and a second flow channel 142 isolated from each other, and the two ends of the first flow channel 141 are respectively connected to the expansion valve 130 and the variable frequency compressor 110. The refrigerant circulation unit also includes a first temperature detection component 151 and a first pressure detection component 152, and the first temperature detection component 151 and the first pressure detection component 152 are arranged on the connecting pipeline between the first flow channel 141 and the variable frequency compressor 110. The coolant circulation unit includes a coolant circulation pipeline 210, and the two ends of the second flow channel 142 are respectively connected to the liquid outlet and the liquid return port of the coolant circulation pipeline 210. The cooling liquid circulation unit further includes a second temperature detection member 231 and a third temperature detection member 232, wherein the second temperature detection member 231 is disposed on the cooling liquid circulation pipeline 210 and is located at the liquid inlet of the second flow channel 142, and the third temperature detection member 232 is disposed on the cooling liquid circulation pipeline 210 and is located at the liquid outlet of the second flow channel 142. The refrigerant circulation unit further includes a first regulating pipeline 161 and a first regulating valve 1611 disposed on the first regulating pipeline 161. The inlet of the first regulating pipeline 161 is connected to the connecting pipeline between the variable frequency compressor 110 and the condenser 120, and the outlet of the first regulating pipeline 161 is connected to the connecting pipeline between the first flow channel 141 and the expansion valve 130. The refrigerant circulation unit further includes a fourth temperature detection member 153, a second pressure detection member 154 and a first flow detection member 155. The fourth temperature detection member 153 and the second pressure detection member 154 are disposed on the connecting pipeline between the condenser 120 and the expansion valve 130. The first flow detection element 155 is disposed on the connecting pipeline between the expansion valve 130 and the first flow channel 141. The cooling liquid circulation unit further includes a second flow detection element 233, which is disposed on the cooling liquid circulation pipeline 210.

[0136] When the above-mentioned battery thermal management test system calibrates the heat load of the battery 10 to be tested and the heat exchange power of the refrigerant cycle unit adapted thereto, the operating frequency of the variable frequency compressor 110 can be adjusted to adjust the cooling capacity output by the refrigerant cycle unit, and then the cooling capacity transferred from the refrigerant flowing through the first flow channel 141 to the coolant in the second flow channel 142 can be adjusted, that is, the heat exchange power of the refrigerant cycle unit is adjusted. The current temperature and current pressure of the refrigerant at the outlet of the first flow channel 141 are detected by the first temperature detection component 151 and the first pressure detection component 152. According to the current pressure of the refrigerant at the outlet of the first flow channel 141 detected by the first pressure detection component 152, the saturation temperature corresponding to the current pressure can be determined; at the same time, the current temperature of the refrigerant at the outlet of the first flow channel 141 detected by the first temperature detection component 151 is compared with the saturation temperature. If the current temperature slightly exceeds the saturation temperature (for example, exceeds 1°C~2°C), it indicates that the latent cooling capacity of the refrigerant flowing out of the first flow channel 141 has been completely released; at the same time, if the temperature difference between the temperature value detected by the second temperature detection component 231 and the temperature value of the third temperature detection component 232 can remain unchanged for a certain period of time (for example, 5min~10min) (that is, the temperature difference between the inlet and outlet coolants of the second flow channel 142 remains constant), it indicates that the cooling capacity output by the refrigerant circulation unit and the cooling capacity required by the coolant circulation unit are balanced with each other, and further indicates that the heat exchange power of the refrigerant circulation unit is adapted to the thermal load of the battery 10 to be tested, that is, the heat load calibration of the battery 10 to be tested and the heat exchange power of the refrigerant circulation unit adapted thereto are completed. It can be seen that, through the battery thermal management test system of the embodiment of the present application, it is convenient to calibrate the heat load of the battery 10 to be tested and the heat exchange power of the refrigerant circulation unit adapted thereto.

[0137] If the cooling capacity output by the refrigerant circulation unit is too much, the cooling capacity output by the refrigerant circulation unit can be reduced by adjusting the operating frequency of the variable frequency compressor 110. After adjusting the operating frequency of the variable frequency compressor 110, if the cooling capacity output by the refrigerant circulation unit is still too much (for example, the refrigerant at the outflow port of the first flow channel 141 is in the two-phase zone, but is about to enter the overheating zone). At this time, the cooling capacity output by the refrigerant circulation unit can be fine-tuned by the first regulating valve 1611. By adjusting the first regulating valve 1611, the heat added to the inflow port of the first flow channel 141 can be fine-tuned, thereby slightly reducing the cooling capacity of the refrigerant entering the first flow channel 141, thereby achieving fine-tuning of the cooling capacity output by the refrigerant circulation unit, which is convenient for calibrating the heat load of the battery 10 to be tested and the heat exchange power of the refrigerant circulation unit adapted to it.

[0138] According to the temperature value detected by the fourth temperature detection element 153 and the pressure value detected by the second pressure detection element 154, the enthalpy value h1 of the refrigerant in the connecting pipeline between the condenser 120 and the expansion valve 130 (i.e., the enthalpy value h1 of the refrigerant at the inlet side of the first flow channel 141) can be calculated. According to the temperature value detected by the first temperature detection element 151 and the pressure value detected by the first pressure detection element 152, the enthalpy value h2 of the refrigerant at the outlet side of the first flow channel 141 can be calculated. The difference between the enthalpy value h2 of the refrigerant at the outlet side of the first flow channel 141 and the enthalpy value h1 of the refrigerant at the inlet side (i.e., the enthalpy difference) and the flow rate of the refrigerant flowing through the first flow channel 141 (i.e., the detection value of the first flow detection element 155) can be used to calculate the cooling capacity Q1 of the refrigerant circulation unit, thereby facilitating the calculation of the heat exchange power of the refrigerant circulation unit based on the cooling capacity Q1 of the refrigerant circulation unit.

[0139] According to the detection results of the second temperature detection element 231 and the third temperature detection element 232, the temperature difference of the coolant on the inlet and outlet sides of the second flow channel 142 can be obtained; and according to the detection result of the second flow detection element 233 (i.e., the flow rate of the coolant flowing through the second flow channel 142), the cooling capacity Q2 of the coolant flowing through the second flow channel 142 can be calculated, i.e., the cooling capacity Q2 of the coolant circulation unit. According to the cooling capacity Q2 of the coolant circulation unit and the cooling capacity Q1 of the refrigerant circulation unit, the heat transfer efficiency of the refrigerant circulation unit to the coolant circulation unit can be calculated, thereby facilitating the heat transfer efficiency of the refrigerant circulation unit at different heat exchange powers.

[0140] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery thermal management test system, characterized in that: It comprises a refrigerant circulation unit and a coolant circulation unit; the refrigerant circulation unit comprises: a variable frequency compressor (110), a condenser (120), an expansion valve (130) and an evaporator (140) connected in sequence through pipelines; the evaporator (140) comprises a first flow channel (141) and a second flow channel (142) which are isolated from each other, and two ends of the first flow channel (141) are respectively connected to the expansion valve (130) and the variable frequency compressor (110); The refrigeration cycle unit further comprises a first temperature detection component (151) and a first pressure detection component (152), wherein the first temperature detection component (151) and the first pressure detection component (152) are respectively arranged on a connecting pipeline between the first flow channel (141) and the variable frequency compressor (110); The cooling liquid circulation unit comprises: a cooling liquid circulation pipeline (210), a second temperature detection component (231) and a third temperature detection component (232); the two ends of the second flow channel (142) are respectively connected to the liquid outlet and the liquid return port of the cooling liquid circulation pipeline (210); the second temperature detection component (231) is arranged on the cooling liquid circulation pipeline (210) and is located at the liquid inlet of the second flow channel (142); the third temperature detection component (232) is arranged on the cooling liquid circulation pipeline (210) and is located at the liquid outlet of the second flow channel (142).

2. The battery thermal management test system according to claim 1, characterized in that: The refrigerant cycle unit further comprises a first regulating pipeline (161) and a first regulating valve (1611) arranged on the first regulating pipeline (161); The inlet of the first regulating pipeline (161) is connected to the connecting pipeline between the variable frequency compressor (110) and the condenser (120), and the outlet of the first regulating pipeline (161) is connected to the connecting pipeline between the first flow channel (141) and the expansion valve (130).

3. The battery thermal management test system according to claim 2, characterized in that: The first regulating pipeline (161) is a capillary tube.

4. The battery thermal management test system according to claim 1, characterized in that: The refrigerant cycle unit also includes: a fourth temperature detecting element (153) and a second pressure detecting element (154), wherein the fourth temperature detecting element (153) and the second pressure detecting element (154) are arranged on a connecting pipeline between the condenser (120) and the expansion valve (130); and A first flow detection component (155), wherein the first flow detection component (155) is arranged on a connecting pipeline between the expansion valve (130) and the first flow channel (141).

5. The battery thermal management test system according to claim 1, characterized in that: The cooling liquid circulation unit further comprises a second flow detection component (233), wherein the second flow detection component (233) is arranged on the cooling liquid circulation pipeline (210).

6. The battery thermal management test system according to claim 1, characterized in that: The coolant circulation unit comprises: a liquid storage container (240), wherein a liquid outlet and a liquid return port of the liquid storage container (240) are respectively connected to the coolant circulation pipeline (210); and A heating element (260), the heating element (260) being arranged in the liquid storage container (240) and being used to heat the coolant in the liquid storage container (240).

7. The battery thermal management test system according to claim 1, characterized in that: The cooling liquid circulation unit comprises a liquid storage container (240) and an auxiliary mixing element (270), and a liquid outlet and a liquid return port of the liquid storage container (240) are respectively connected to the cooling liquid circulation pipeline (210); The auxiliary mixing element (270) is located inside the liquid storage container (240); the auxiliary mixing element (270) and the inner wall of the liquid storage container (240) jointly define a flow cavity (270a); the auxiliary mixing element (270) is sealedly connected to the inner wall of the liquid storage container (240); a liquid return port (242) of the liquid storage container (240) is provided on the cavity wall of the flow cavity (270a); and a liquid outlet (241) of the liquid storage container (240) is located outside the flow cavity (270a); The auxiliary mixing element (270) is provided with a plurality of flow openings (2701), and a liquid outlet direction (A1) of the flow openings (2701) is arranged at an angle to a liquid outlet direction (A2) of a liquid outlet (241) of the liquid storage container (240).

8. The battery thermal management test system according to claim 7, characterized in that: The auxiliary mixing element (270) comprises an end plate (271) and a plurality of sequentially connected side plates (272), wherein the end plate (271) is arranged at an end of the side plate (272) along its extension direction; A plurality of flow openings (2701) are provided on the end plate (271) and / or the side plate (272).

9. The battery thermal management test system according to claim 7, characterized in that: The liquid outflow direction (A1) of the flow port (2701) is perpendicular to the liquid outflow direction (A2) of the liquid outlet (241) of the liquid storage container (240).

10. The battery thermal management test system according to claim 1, characterized in that: The cooling liquid circulation unit comprises a liquid storage container (240); the cooling liquid circulation pipeline (210) comprises a first liquid outlet pipeline (211), a first liquid return pipeline (212), a second liquid outlet pipeline (213), and a second liquid return pipeline (214); The liquid inlet of the second flow channel (142) is in communication with the liquid storage container (240) via the first liquid outlet pipeline (211), and the liquid outlet of the second flow channel (142) is in communication with the liquid storage container (240) via the first liquid return pipeline (212); The liquid storage container (240) is connected to the liquid inlet of the heat exchange channel of the cold plate of the battery to be tested via the second liquid outlet pipeline (213), and the liquid storage container (240) is connected to the liquid outlet of the heat exchange channel of the cold plate of the battery to be tested (10) via the second liquid return pipeline (214).

11. The battery thermal management test system according to claim 1, characterized in that: The refrigerant cycle unit further comprises a second regulating pipeline (162) and a second regulating valve (1621) arranged on the second regulating pipeline (162); The inlet of the second regulating pipeline (162) is connected to the connecting pipeline between the variable frequency compressor (110) and the condenser (120), and the outlet of the second regulating pipeline (162) is connected to the connecting pipeline between the variable frequency compressor (110) and the first flow channel (141).

12. The battery thermal management test system according to claim 1, characterized in that: The refrigerant cycle unit further comprises a third regulating pipeline (163) and a third regulating valve (1631) arranged on the third regulating pipeline (163); The inlet of the third regulating pipeline (163) is connected to the connecting pipeline between the condenser (120) and the expansion valve (130), and the outlet of the third regulating pipeline (163) is connected to the connecting pipeline between the variable frequency compressor (110) and the first flow channel (141).

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