Battery pack performance test system and vehicle battery hot and cold dynamic characteristics simulation system

Abstract

The present application provides a battery pack performance test system and a vehicle-mounted battery cooling and heating dynamic characteristics simulation system. The battery pack performance test system of the present application and the vehicle-mounted battery cooling and heating dynamic characteristics simulation system are integrated into an integrated device, which can not only be used as a cooling and heating all-in-one machine for cooling and heating tests of battery packs, but also can be used as a cooling and heating all-in-one machine for simulating the dynamic characteristics of the battery cooling and heating system in the vehicle state, with a compact structure, low flow resistance, excellent heat transfer performance, and low cost.

Description

Technical Field

[0001] The present application relates to the field of battery testing technology, and in particular to a battery pack performance testing system and a vehicle-mounted battery cold and hot dynamic characteristics simulation system. Background Art

[0002] With the increase in battery pack energy density and cost pressure, the heat generated by battery packs is getting higher and higher. Many battery packs used in automobiles are cooled by liquid cooling, which is accompanied by the use of liquid for heating. Therefore, a hot and cold all-in-one machine is needed for battery pack cooling and heating testing. Currently, there are few hot and cold all-in-one machines on the market that are specially designed for testing the thermal performance characteristics of battery packs, and there are no hot and cold all-in-one machines that can be used to simulate the dynamic characteristics of the battery cooling-heating system under vehicle conditions. Summary of the invention

[0003] In view of the above-mentioned shortcomings of the prior art, the purpose of the present application is to provide a battery pack performance testing system and a vehicle-mounted battery hot and cold dynamic characteristics simulation system to solve the above-mentioned problems in the prior art.

[0004] To achieve the above-mentioned purpose and other related purposes, the present application provides a battery pack performance testing system, comprising: a water tank; an antifreeze coolant is arranged in the water tank, and an evaporator and a first heater immersed in the antifreeze coolant; the water inlet of the water tank is connected to the water outlet of the battery pack through a first pipe, and the water outlet of the water tank is connected to the water inlet of the battery pack through a second pipe; a first compressor; the low-pressure inlet end of the first compressor is connected to the outlet end of the evaporator; a first condenser; the inlet end of the first condenser is connected to the high-pressure outlet end of the first compressor; a first expansion valve; the first expansion valve is respectively connected to the outlet end of the first condenser and the inlet end of the evaporator; a first water pump, a flow valve, a flow meter, and a first pressure gauge are arranged in sequence in the second pipe; the first water pump is arranged at one end near the water outlet of the water tank, and the first pressure gauge is arranged at one end near the water inlet of the battery pack; a second pressure gauge is arranged in the first pipe and is located at one end near the water outlet of the battery pack.

[0005] In one embodiment of the present application, the flow meter is a volumetric capacity meter.

[0006] In one embodiment of the present application, the testing system also includes: a first filter, and / or a second filter; the first filter is arranged between the low-pressure inlet end of the first compressor and the outlet end of the evaporator; the second filter is arranged in the second pipe and located between the water outlet of the water tank and the first water pump.

[0007] To achieve the above-mentioned purpose and other related purposes, the present application provides a vehicle-mounted battery cold and hot dynamic characteristics simulation system based on any of the battery pack performance test systems as described above, including: a vehicle-mounted battery cooling dynamic characteristics simulation branch, and a vehicle-mounted battery heating dynamic characteristics simulation branch; wherein, the input end of the vehicle-mounted battery cooling dynamic characteristics simulation branch and the input end of the vehicle-mounted battery heating dynamic characteristics simulation branch are connected to the first pipe to be connected to the water outlet of the battery pack, and share the second pressure gauge with the battery pack performance test system; the output end of the vehicle-mounted battery cooling dynamic characteristics simulation branch and the output end of the vehicle-mounted battery heating dynamic characteristics simulation branch are connected to the second pipe to be connected to the water inlet of the battery pack, and share the flow meter and the first pressure gauge with the battery pack performance test system.

[0008] In one embodiment of the present application, the vehicle battery cooling dynamic characteristics simulation branch includes: a regulating valve, a plate heat exchanger for simulating a plate heat exchanger for vehicle battery cooling, a second expansion valve, a second condenser, a second compressor for simulating a compressor for vehicle battery cooling, an expansion kettle, and an interface for connecting a second water pump; wherein the regulating valve is respectively connected to the second pressure gauge and the input end of the first heat exchange side of the plate heat exchanger; the output end of the first heat exchange side of the plate heat exchanger is connected to the input end of the expansion kettle; the interface is connected between the expansion kettle and the flow meter; the interface enables the low-pressure input end of the second water pump connected to the interface to be connected to the output end of the expansion kettle, and the high-pressure output end to be connected to the flow meter; the output end of the second heat exchange side of the plate heat exchanger is connected to the low-pressure inlet end of the second compressor; the high-pressure outlet end of the second compressor is connected to the input end of the second condenser; the output end of the second condenser is connected to the input end of the second heat exchange side of the plate heat exchanger through the second expansion valve.

[0009] In one embodiment of the present application, the second water pump includes: a vehicle-mounted water pump, or a plurality of water pump groups connected in series.

[0010] In one embodiment of the present application, the simulation system further includes: a third filter connected between the output end of the second heat exchange side of the plate heater and the low-pressure inlet end of the second compressor.

[0011] In one embodiment of the present application, the vehicle-mounted battery heating dynamic characteristics simulation branch includes: a regulating valve, a second heater for simulating a heater for vehicle-mounted battery heating, an expansion kettle, and an interface for connecting a second water pump, which are connected in sequence; the regulating valve is respectively connected to the second pressure gauge and one end of the second heater; the other end of the second heater is connected to the input end of the expansion kettle; the interface is connected between the expansion kettle and the flow meter; the interface enables the low-pressure input end of the second water pump connected to the interface to be connected to the output end of the expansion kettle, and the high-pressure output end to be connected to the flow meter.

[0012] In one embodiment of the present application, the second water pump includes: a vehicle-mounted water pump, or a plurality of water pump groups connected in series.

[0013] In one embodiment of the present application, the simulation system further includes: a fourth filter connected between the second heater and an input end of the expansion kettle.

[0014] In one embodiment of the present application, the vehicle battery cooling dynamic characteristics simulation branch includes: a plate heat exchanger for simulating vehicle battery cooling, a second expansion valve, a second condenser, and a second compressor for simulating vehicle battery cooling, and the simulation system also includes: a first three-way valve and a second three-way valve; wherein the first three-way valve is connected in series between the regulating valve and the second heater, and its output end is connected to the input end of the first heat exchange side of the plate heat exchanger; the second three-way valve is connected in series between the output end of the first three-way valve and the input end of the first heat exchange side of the plate heat exchanger, and its output end is connected to the output end of the first heat exchange side of the plate heat exchanger; the output end of the first heat exchange side of the plate heat exchanger is connected to the input end of the expansion kettle; the output end of the second heat exchange side of the plate heat exchanger is connected to the low-pressure inlet end of the second compressor; the high-pressure outlet end of the second compressor is connected to the input end of the second condenser; the output end of the second condenser is connected to the input end of the second heat exchange side of the plate heat exchanger through the second expansion valve.

[0015] In one embodiment of the present application, the simulation system further includes: a fourth filter connected between the output end of the first heat exchange side of the plate heat exchanger and the input end of the expansion kettle.

[0016] In one embodiment of the present application, the exterior of one or more combinations of the plate heat exchanger, the second heater, the first pipeline, and the second pipeline is wrapped with thermal insulation cotton.

[0017] In one embodiment of the present application, the total length of the pipeline of the vehicle-mounted battery cooling dynamic characteristics simulation branch and the vehicle-mounted battery heating dynamic characteristics simulation branch, the pipeline length from the water inlet of the battery pack to the simulation system, and the pipeline length from the water outlet of the battery pack to the simulation system respectively correspond to the vehicle-mounted pipeline length; the pipeline resistance coefficient of the vehicle-mounted battery cooling dynamic characteristics simulation branch and the vehicle-mounted battery heating dynamic characteristics simulation branch, the pipeline resistance coefficient from the water inlet of the battery pack to the simulation system, and the pipeline resistance coefficient from the water outlet of the battery pack to the simulation system respectively correspond to the vehicle-mounted pipeline resistance coefficient.

[0018] In one embodiment of the present application, the horizontal heights of the vehicle battery cooling dynamic characteristics simulation branch and the vehicle battery heating dynamic characteristics simulation branch are consistent with the height of the test battery pack.

[0019] In one embodiment of the present application, the simulation system further includes: a human-machine interface communicatively connected to the simulation system to remotely control the simulation system.

[0020] In one embodiment of the present application, the simulation system further includes: an auxiliary device that is communicatively connected to the simulation system to monitor the operation of the simulation system and to give an alarm and record when an abnormal situation is found.

[0021] As described above, the battery pack performance test system and the vehicle-mounted battery cold and hot dynamic characteristics simulation system of the present application integrate the battery pack performance test system and the vehicle-mounted battery cold and hot dynamic characteristics simulation system into an integrated device. It can not only be used as a cold and hot all-in-one machine for cooling and heating tests on battery packs, but also can be used as a cold and hot all-in-one machine to simulate the dynamic characteristics of the battery cooling-heating system under vehicle-mounted conditions. It has beneficial technical effects such as compact structure, low flow resistance, excellent heat transfer performance, and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Shown is a structural schematic diagram of a vehicle-mounted battery cold and hot dynamic characteristics simulation system based on a battery performance testing system in one embodiment of the present application. DETAILED DESCRIPTION

[0023] The following describes the embodiments of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. The present application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0024] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application, and thus the drawings only show components related to the present application rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed at will, and the component layout may also be more complicated.

[0025] The present application proposes a battery pack testing system and a vehicle-mounted battery hot and cold dynamic performance simulation system based on the testing system, which can be used for testing the hot and cold performance characteristics of the battery pack and for simulating the dynamic characteristics of the battery cooling-heating system under vehicle-mounted conditions.

[0026] First embodiment

[0027] See also Figure 1 The present embodiment provides a battery pack performance testing system, which includes the following components: a water tank 101, a first expansion valve 102, a first condenser 103, a first compressor 104, a first filter 105, a second filter 106, a first water pump 107, a flow valve 108, a second pipeline 109, a flow meter 140, a first pressure gauge 141, a second pressure gauge 142, and a first pipeline 122.

[0028] It should be noted that the test system of this embodiment includes both the first filter 105 and the second filter 106 in order to achieve a better filtering effect. In practical applications, those skilled in the art may completely omit the setting of these two components, or choose to set one of the two components.

[0029] The water tank 101 is provided with an antifreeze coolant, and an evaporator and a first heater immersed in the antifreeze coolant. The water inlet of the water tank 101 is connected to the water outlet of the battery pack through the first pipe 122, and the water outlet of the water tank 101 is connected to the water inlet of the battery pack through the second pipe 109. The low-pressure inlet end of the first compressor 104 is connected to the outlet end of the evaporator. The inlet end of the first condenser 103 is connected to the high-pressure outlet end of the first compressor 104. The first expansion valve 102 is connected to the outlet end of the first condenser 103 and the inlet end of the evaporator respectively. The first water pump 107, the flow valve 108, the flow meter 140, and the first pressure gauge 141 are sequentially arranged in the second pipe 109, wherein the first water pump 107 is arranged at one end near the water outlet of the water tank 101, and the first pressure gauge 141 is arranged at one end near the water inlet of the battery pack. The second pressure gauge 142 is arranged in the first pipe 122 and is located at one end near the water outlet of the battery pack. The first filter 105 is disposed between the low pressure inlet of the first compressor 104 and the outlet of the evaporator. The second filter 106 is disposed in the second pipe 109 and between the water outlet of the water tank 101 and the first water pump 107 .

[0030] The battery pack performance testing system provided in this embodiment has the following features:

[0031] Feature 1: The evaporator and the heater are immersed in the antifreeze coolant, which is generally an ethylene glycol aqueous solution, and the temperature fluctuation of the coolant is generally ≤±1°C. The first compressor 104 has a large cooling power, the heater has a large heating power, the water tank 101 is large, the power of the first water pump 107 is large, and the flow valve 108 is used to set the flow, so that the flow can be output according to the specified temperature requirements and flow requirements within the temperature range of -30°C to 60°C and the flow range of 2L / min to 25L / min.

[0032] Feature 2: The flow meter 140 uses a volumetric flow meter, such as a gear flow meter, so that the flow of the ethylene glycol aqueous solution at low temperatures maintains a good measurement accuracy, with an accuracy of ≤0.5L / min. Currently, the most widely used flow meter 140 in the battery testing field is a velocity flow meter, and there are almost no liquid cooling and liquid heating test equipment using a gear flow meter.

[0033] Feature 3: The first pressure gauge 141 and the second pressure gauge 142 are high-precision pressure gauges with an accuracy of ≤50pa.

[0034] Feature 4: The first compressor 104 has safety functions such as overheat protection, overcurrent protection, high and low pressure protection, overtemperature protection, flow protection, phase sequence / phase loss protection, and exhaust overheat protection.

[0035] Second embodiment

[0036] Based on the aforementioned battery pack performance testing system, the present application also provides a vehicle-mounted battery hot and cold dynamic characteristics simulation system, which includes two major branches: a vehicle-mounted battery cooling dynamic characteristics simulation branch and a vehicle-mounted battery heating dynamic characteristics simulation branch.

[0037] The input end of the vehicle battery cooling dynamic characteristics simulation branch is connected to the first pipe 122 to be connected to the water outlet of the battery pack, and the second pressure gauge 142 is shared with the battery pack performance test system. The output end of the vehicle battery cooling dynamic characteristics simulation branch is connected to the second pipe 109 to be connected to the water inlet of the battery pack, and the flow meter 140 and the first pressure gauge 141 are shared with the battery pack performance test system.

[0038] The vehicle battery cooling dynamic characteristics simulation branch includes: a regulating valve 121, a plate heat exchanger 113 for simulating vehicle battery cooling, a second expansion valve 114, a second condenser 110, a second compressor 111 for simulating vehicle battery cooling, an expansion kettle 116, and an interface for connecting a second water pump 117 (such as a vehicle-mounted water pump, or a plurality of water pump groups connected in series). In detail: the regulating valve 121 is respectively connected to the second pressure gauge 142 and the input end of the first heat exchange side of the plate heat exchanger 113; the output end of the first heat exchange side of the plate heat exchanger 113 is connected to the input end of the expansion kettle 116; the interface is connected between the expansion kettle 116 and the flow meter 140; the interface enables the low-pressure input end of the second water pump 117 connected to the interface to be connected to the output end of the expansion kettle 116, and the high-pressure output end to be connected to the flow meter 140; the output end of the second heat exchange side of the plate heat exchanger 113 is connected to the low-pressure inlet end of the second compressor 111; the high-pressure outlet end of the second compressor 111 is connected to the input end of the second condenser 110; the output end of the second condenser 110 is connected to the input end of the second heat exchange side of the plate heat exchanger 113 through the second expansion valve 114.

[0039] Optionally, the vehicle-mounted battery cooling dynamic characteristic simulation branch further includes: a third filter 112 , which is connected between the output end of the second heat exchange side of the plate heat exchanger 113 and the low-pressure inlet end of the second compressor 111 .

[0040] Preferably, the second compressor 111 has safety functions such as overheat protection, overcurrent protection, high and low pressure protection, overtemperature protection, flow protection, phase sequence / phase loss protection, and exhaust overheat protection.

[0041] The input end of the vehicle-mounted battery heating dynamic characteristics simulation branch is connected to the first pipe 122 to be connected to the water outlet of the battery pack, and shares the second pressure gauge 142 with the battery pack performance test system; the output end of the vehicle-mounted battery heating dynamic characteristics simulation branch is connected to the second pipe 109 to be connected to the water inlet of the battery pack, and shares the flow meter 140 and the first pressure gauge 141 with the battery pack performance test system.

[0042] The vehicle-mounted battery heating dynamic characteristic simulation branch includes: a regulating valve 121, a second heater 120 for simulating vehicle-mounted battery heating, an expansion kettle 116, and an interface for connecting a second water pump 117 (such as a vehicle-mounted water pump, or a plurality of water pumps connected in series) connected in sequence. In detail: the regulating valve 121 is respectively connected to the second pressure gauge 142 and one end of the second heater 120; the other end of the second heater 120 is connected to the input end of the expansion kettle 116; the interface is connected between the expansion kettle 116 and the flow meter 140; the interface enables the low-pressure input end of the second water pump 117 connected to the interface to be connected to the output end of the expansion kettle 116, and the high-pressure output end to be connected to the flow meter 140.

[0043] Optionally, the vehicle-mounted battery heating dynamic characteristic simulation branch further includes: a fourth filter 115 connected between the second heater 120 and the input end of the expansion kettle 116 .

[0044] Third embodiment

[0045] See also Figure 1 The vehicle battery cooling dynamic characteristics simulation branch and the vehicle battery heating dynamic characteristics simulation branch of the second embodiment can also be integrated into one through a three-way valve, so that the structure of the entire simulation system is more compact. In detail, the components in these two branches are: the second condenser 110, the second compressor 111, the third filter 112, the plate heat exchanger 113, the second expansion valve 114, the fourth filter 115, the expansion kettle 116, the second water pump 117, the second three-way valve 118, the first three-way valve 119, the second heater 120, and the regulating valve 121.

[0046] It should be noted that the test system of this embodiment includes both the third filter 112 and the fourth filter 115 in order to achieve a better filtering effect. In practical applications, those skilled in the art may completely omit the setting of these two components, or choose to set one of the two components.

[0047] Since the composition of the vehicle battery cooling dynamic characteristic simulation branch and the composition of the vehicle battery heating dynamic characteristic simulation branch have been described in detail in the second embodiment, this embodiment will mainly introduce the structure of integrating these two branches. The integrated structure is mainly realized by the first three-way valve 119 and the second three-way valve 118. In detail: the first three-way valve 119 is connected in series between the regulating valve 121 and the heater, and its output end is connected to the input end of the first heat exchange side of the plate heat exchanger 113; the second three-way valve 118 is connected in series between the output end of the first three-way valve 119 and the input end of the first heat exchange side of the plate heat exchanger 113, and its output end is connected to the output end of the first heat exchange side of the plate heat exchanger 113.

[0048] Preferably, the plate heat exchanger 113, the second heater 120, and the first pipe 122 and the second pipe 109 are wrapped with heat insulation cotton. The second expansion valve 114 is an electronic expansion valve, the second compressor 111 is a variable frequency compressor, and the fan of the second condenser 110 is a PMW controlled fan. The first pressure gauge 141 and the second pressure gauge 142 are high-precision pressure gauges.

[0049] The vehicle-mounted battery cold and hot dynamic characteristics simulation system provided in this embodiment, when the battery pack is heated, the coolant does not pass through the plate heat exchanger 113 through the second three-way valve 118; when the battery pack is cooled, the coolant does not pass through the second heater 120 through the first three-way valve 119. By adjusting the frequency of the second compressor 111 and the plate heat exchanger 113, and adjusting the opening of the second expansion valve 114 to adjust the cooling power and overheating, the cooling process of the battery pack in the vehicle environment is simulated. The heating power is adjusted by adjusting the power of the second heater 120, and the flow rate is adjusted by adjusting the power of the second water pump 117 (group) and the electronic regulating valve 121. In addition, in order to simulate a more realistic situation, the third embodiment reserves an interface for the second water pump 117 on the simulation system, which can be used to directly connect a vehicle-mounted water pump for a certain vehicle model to perform a heating test on the heated battery pack.

[0050] Since the viscosity of the coolant is very high at low temperatures, the length of the battery pack's external pipe and the local resistance have a greater impact on the flow rate. In view of this, the pipe length and resistance coefficient inside the simulation system, the pipe length and resistance coefficient from the battery pack water inlet to the simulation system, and the pipe length and resistance coefficient from the battery pack water outlet to the simulation system in this embodiment should be close to the vehicle-mounted pipe length and resistance coefficient. In addition, the horizontal height of the simulation system of this embodiment is basically the same as the height of the test battery pack, and the pipe length is as close to the vehicle-mounted pipe length as possible to more realistically simulate the vehicle-mounted heating process.

[0051] Fourth embodiment

[0052] Based on the aforementioned battery pack performance test system and vehicle-mounted battery hot and cold dynamic characteristics simulation system, this embodiment provides a human-machine interface for remotely controlling the system and an auxiliary device for detecting its operating conditions.

[0053] The human-machine interface is connected to the electronic components in the battery pack performance test system and the vehicle battery cold and hot dynamic characteristics simulation system through communication, and controls these electronic components according to the control instructions input by the user, for example: by connecting with the pressure gauge (set as needed) to obtain the measured values ​​of the outlet and return water pressures and display them to the user, by connecting with the flow meter (set as needed) to achieve flow measurement and display it to the user, by connecting with the water tank to control the coolant temperature, etc. Optionally, the collected measurement data can be saved and output in excel, csv and other formats according to user instructions; for example, by connecting with the water pump to control the start and stop operation of the water pump, etc.; for example, while the refrigeration power, superheat, and plate heat exchanger outlet water temperature are displayed in real time, the second compressor, plate heat exchanger and second expansion valve can be feedback controlled. Due to limited space, they are not listed one by one.

[0054] The auxiliary device is connected to the electronic components in the battery pack performance test system and the vehicle battery cold and hot dynamic characteristics simulation system through communication, and automatically diagnoses the monitored operation status according to the preset protection limits of each level, and gives an alarm (such as sound and light alarm, emergency shutdown) and display when an abnormal situation is found, and then stores the fault information, for example, automatically saves the recorded information 10 minutes before the shutdown.

[0055] In summary, the battery pack performance testing system and the vehicle battery hot and cold dynamic characteristics simulation system of the present application effectively overcome the various shortcomings of the prior art and have high industrial utilization value.

[0056] The above embodiments are merely illustrative of the principles and effects of the present application and are not intended to limit the present application. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by a person of ordinary skill in the art without departing from the spirit and technical ideas disclosed in the present application shall still be covered by the claims of the present application.

Claims

1. A vehicle battery thermal dynamic characteristics simulation system, characterized in that: include: Battery pack performance test system, vehicle battery cooling dynamic characteristics simulation branch, and vehicle battery heating dynamic characteristics simulation branch; Among them, The battery pack performance test system comprises: a water tank; an antifreeze coolant is arranged in the water tank, and an evaporator and a first heater immersed in the antifreeze coolant; a water inlet of the water tank is connected to a water outlet of the battery pack through a first pipe, and a water outlet of the water tank is connected to a water inlet of the battery pack through a second pipe; A first compressor; a low-pressure inlet end of the first compressor is connected to an outlet end of the evaporator; A first condenser; an inlet end of the first condenser is connected to a high-pressure outlet end of the first compressor; A first expansion valve; the first expansion valve is respectively connected to the outlet end of the first condenser and the inlet end of the evaporator; A first water pump, a flow valve, a flow meter, and a first pressure gauge are sequentially arranged in the second pipeline; the first water pump is arranged at one end near the water outlet of the water tank, and the first pressure gauge is arranged at one end near the water inlet of the battery pack; the flow meter is a volumetric capacity meter; a second pressure gauge, disposed on the first pipe and located at one end close to the water outlet of the battery pack; a first filter, the first filter being disposed between a low-pressure inlet end of the first compressor and an outlet end of the evaporator; a second filter, the second filter being disposed in the second pipe and located between the water outlet of the water tank and the first water pump; The input end of the vehicle battery cooling dynamic characteristic simulation branch and the input end of the vehicle battery heating dynamic characteristic simulation branch are connected to the first pipe to be connected to the water outlet of the battery pack, and the second pressure gauge is shared with the battery pack performance test system; The output end of the vehicle battery cooling dynamic characteristic simulation branch and the output end of the vehicle battery heating dynamic characteristic simulation branch are connected to the second pipe to be connected to the water inlet of the battery pack, and the flow meter and the first pressure gauge are shared with the battery pack performance test system; The vehicle battery cooling dynamic characteristics simulation branch includes: a regulating valve, a plate heat exchanger for simulating vehicle battery cooling, a second expansion valve, a second condenser, a second compressor for simulating vehicle battery cooling, an expansion kettle, and an interface for connecting a second water pump; wherein, The regulating valve is respectively connected to the second pressure gauge and the input end of the first heat exchange side of the plate heat exchanger; The output end of the first heat exchange side of the plate heat exchanger is connected to the input end of the expansion kettle; The interface is connected between the expansion kettle and the flow meter; the interface enables the low-pressure input end of the second water pump connected to the interface to be connected to the output end of the expansion kettle, while the high-pressure output end is connected to the flow meter; The output end of the second heat exchange side of the plate heat exchanger is connected to the low-pressure inlet end of the second compressor; The high-pressure outlet end of the second compressor is connected to the input end of the second condenser; The output end of the second condenser is connected to the input end of the second heat exchange side of the plate heat exchanger through the second expansion valve; The simulation system further includes: a first three-way valve, a second three-way valve, and a second heater; wherein, The first three-way valve is connected in series between the regulating valve and the second heater, and its output end is connected to the input end of the first heat exchange side of the plate heat exchanger; The second three-way valve is connected in series between the output end of the first three-way valve and the input end of the first heat exchange side of the plate heat exchanger, and its output end is connected to the output end of the first heat exchange side of the plate heat exchanger.

2. The simulation system according to claim 1, characterized in that The second water pump includes: a vehicle-mounted water pump, or a plurality of water pump groups connected in series.

3. The simulation system according to claim 1, characterized in that: Also includes: The third filter is connected between the output end of the second heat exchange side of the plate heat exchanger and the low-pressure inlet end of the second compressor.

4. The simulation system according to claim 1, characterized in that: The vehicle battery heating dynamic characteristic simulation branch includes: a regulating valve, a second heater for simulating vehicle battery heating, an expansion kettle, and an interface for connecting a second water pump connected in sequence; The regulating valve is respectively connected to the second pressure gauge and one end of the second heater; The other end of the second heater is connected to the input end of the expansion kettle; The interface is connected between the expansion kettle and the flow meter; the interface enables the low-pressure input end of the second water pump connected to the interface to be connected to the output end of the expansion kettle, while the high-pressure output end is connected to the flow meter.

5. The simulation system according to claim 4, characterized in that: The second water pump includes: a vehicle-mounted water pump, or a plurality of water pump groups connected in series.

6. The simulation system according to claim 5, characterized in that: Also includes: The fourth filter is connected between the second heater and the input end of the expansion kettle.

7. The simulation system according to claim 1, characterized in that: Also includes: The fourth filter is connected between the output end of the first heat exchange side of the plate heat exchanger and the input end of the expansion kettle.

8. The simulation system according to claim 1, characterized in that: The exterior of one or more combinations of the plate heat exchanger, the second heater, the first pipeline, and the second pipeline is wrapped with thermal insulation cotton.

9. The simulation system according to claim 1, characterized in that: The total length of the pipeline of the vehicle-mounted battery cooling dynamic characteristics simulation branch and the vehicle-mounted battery heating dynamic characteristics simulation branch, the pipeline length from the water inlet of the battery pack to the simulation system, and the pipeline length from the water outlet of the battery pack to the simulation system respectively correspond to the vehicle-mounted pipeline length; the pipeline resistance coefficient of the vehicle-mounted battery cooling dynamic characteristics simulation branch and the vehicle-mounted battery heating dynamic characteristics simulation branch, the pipeline resistance coefficient from the water inlet of the battery pack to the simulation system, and the pipeline resistance coefficient from the water outlet of the battery pack to the simulation system respectively correspond to the vehicle-mounted pipeline resistance coefficient.

10. The simulation system according to claim 1, characterized in that: The horizontal heights of the vehicle-mounted battery cooling dynamic characteristic simulation branch and the vehicle-mounted battery heating dynamic characteristic simulation branch are consistent with the height of the test battery pack.

11. The simulation system according to claim 1, characterized in that: Also includes: A human-machine interface is communicatively connected to the simulation system to remotely control the simulation system.

12. The simulation system according to claim 1, characterized in that: Also includes: An auxiliary device is connected to the simulation system for monitoring the operation of the simulation system and giving an alarm and recording when an abnormal situation is found.

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