A warming device and a pretreatment method for fuel cell cold start testing

Abstract

The present application discloses a rewarming device and a pretreatment method for fuel cell cold start testing. The rewarming device includes: a battery; an external circulation pipeline, on which a heating device is arranged, and the heating device is configured to heat the liquid in the external circulation pipeline and maintain it at a first preset temperature; an internal circulation pipeline, which is communicated with the battery, and on which a loop circulation pump is arranged, and the loop circulation pump is configured to drive the liquid in the internal circulation pipeline and the battery to flow; the internal circulation pipeline and the external circulation pipeline are communicated through a first water inlet and a water outlet arranged on the internal circulation pipeline, a first switching device is arranged between the first water inlet and the water outlet, the liquid in the external circulation pipeline flows to the battery through the first water inlet, flows to the internal circulation pipeline after circulating in the battery, and flows out through the water outlet to realize circulation, and the external circulation pipeline is configured to exchange heat for the internal circulation pipeline through liquid circulation.

Description

Technical Field

[0001] This application belongs to the technical field of fuel cells, and particularly relates to a temperature recovery device and a pretreatment method for fuel cell cold start testing. Background Art

[0002] Fuel cell cold start testing is an essential part of the stack R & D testing. The traditional cold start testing generally places the stack inside an environmental chamber at -30°C, and after a long time of static placement, both the environment and the stack reach a temperature of -30°C. Then, when it is confirmed that each point inside the chamber reaches -30°C, the cold start testing of the stack begins.

[0003] After the cold start testing is completed, regardless of whether the cold start of the stack is successful or not, the inside of the stack must be quickly warmed up. This testing step is to prevent damage to the fuel cell. For example, the water generated during the cold start process of the fuel cell will freeze due to the low environmental temperature, and the ice thorns generated may damage the membrane electrode. In the existing experimental environment, the temperature control liquid circuits are separated from each other. When it is necessary to switch the pipelines for temperature recovery, the fuel cell needs to wait for a long time, with low efficiency and is prone to damage to the fuel cell.

[0004] Therefore, for those skilled in the art, it is necessary to consider how to ensure that the external antifreeze is always in a high-temperature state during the experiment and the pipelines can be switched at any time, so that the antifreeze enters the internal circulation to heat and warm up the stack. Summary of the Invention

[0005] The purpose of the embodiments of this application is to provide a temperature recovery device and a pretreatment method for fuel cell cold start testing.

[0006] According to the first aspect of the embodiments of this application, a temperature recovery device for fuel cell cold start testing is provided, including:

[0007] A battery;

[0008] An external circulation pipeline, on which a heating device is arranged, and the heating device is configured to heat the liquid in the external circulation pipeline and maintain it at a first preset temperature;

[0009] An internal circulation pipeline, which is communicated with the battery, and on which a loop circulation pump is arranged, and the loop circulation pump is configured to drive the liquid in the internal circulation pipeline and the battery to flow;

[0010] The inner circulation pipeline and the outer circulation pipeline are connected through a first water inlet and a water outlet provided on the inner circulation pipeline. A first switching device is provided between the first water inlet and the water outlet. The liquid in the outer circulation pipeline flows through the first water inlet to the battery, flows to the inner circulation pipeline after circulating in the battery, and flows out through the water outlet to achieve circulation. The outer circulation pipeline is configured to exchange heat for the inner circulation pipeline through liquid circulation.

[0011] Optionally, the outer circulation pipeline includes a main pipeline, a first branch pipeline, and a second branch pipeline. One ends of the first branch pipeline and the second branch pipeline are both connected to the main pipeline. The other end of the first branch pipeline is connected to the first water inlet, and the other end of the second branch pipeline is connected to the water outlet.

[0012] Optionally, a second water inlet and a third water inlet are provided on the inner circulation pipeline. A liquid storage device is provided on the main pipeline. The liquid storage device is connected to the second water inlet through a third branch pipeline, and the liquid storage device is connected to the third water inlet through a fourth branch pipeline. The third branch pipeline and the fourth branch pipeline can be opened or closed, and the liquid in the liquid storage device can flow to the inner circulation pipeline through the third branch pipeline and the fourth branch pipeline.

[0013] Optionally, the main pipeline includes a first pipeline, a second pipeline, and a third pipeline connected in sequence. The heating device is provided on the third pipeline. The first branch pipeline and the second branch pipeline are both connected to the third pipeline;

[0014] The liquid storage device is provided between the first pipeline and the second pipeline;

[0015] Second switching devices are provided on the first pipeline and the second pipeline. When the battery needs to be warmed up, the first pipeline and the second pipeline are closed.

[0016] Optionally, the outer circulation pipeline further includes a warming pump. The warming pump is provided on the second pipeline and is configured to drive the liquid in the outer circulation pipeline to flow.

[0017] Optionally, a pressure monitoring device, a temperature monitoring device, and a flow monitoring device are provided on the inner circulation pipeline.

[0018] Optionally, the main pipeline further includes a fourth pipeline. The fourth pipeline is in a parallel relationship with the second pipeline on the main pipeline. The fourth pipeline is connected to the inner circulation pipe through the third pipeline and the first branch pipeline;

[0019] The warming device further includes a precooling device;

[0020] The pre-cooling device is arranged on the fourth pipeline;

[0021] Third switching devices are arranged on both the third pipeline and the fourth pipeline;

[0022] The pre-cooling device is configured to provide a pre-cooling function for the battery;

[0023] When pre-cooling the battery through the pre-cooling device, the third pipeline is closed and the fourth pipeline is opened.

[0024] According to a second aspect of the embodiments of the present application, a pre-treatment method for a warming device is provided for fuel cell cold start testing, including:

[0025] First, before the battery test, the first pipeline, the second pipeline and the third pipeline are opened, the first branch pipeline, the second branch pipeline, the third branch pipeline, the fourth branch pipeline and the fourth pipeline are closed, the warming pump is turned on, and the temperature in the outer circulation pipeline will be heated by the heating device and maintained at a first preset temperature;

[0026] Secondly, the loop circulation pump is turned on, the battery test is started, and through the loop circulation pump, the liquid circulates between the inner circulation pipeline and the battery;

[0027] Then, after the battery test is completed, the warming pump is turned off, the first pipeline and the second pipeline are closed, and the first branch pipeline and the second branch pipeline are opened;

[0028] The liquid in the outer circulation pipeline returns to the first branch pipeline again through the first branch pipeline, the inner circulation pipeline, the battery, the second branch pipeline and the heating device until the battery warms up to a second preset temperature.

[0029] Optionally, after the battery test is completed, the warming pump is turned off, the first pipeline and the second pipeline are closed, the first branch pipeline and the second branch pipeline are opened, and the third branch pipeline and / or the fourth pipeline are opened;

[0030] The liquid in the outer circulation pipeline flows back to the first branch pipeline again through the first branch pipeline, the inner circulation pipeline, the battery, the second branch pipeline and the heating device, and the liquid in the liquid storage device supplements the liquid into the inner circulation pipeline through the third branch pipeline and / or the fourth pipeline until the battery warms up to a second preset temperature.

[0031] Optionally, before the battery test, the first branch pipeline, the second branch pipeline and the fourth pipeline are opened, the first switching device is closed, and the battery is kept within a third preset temperature through the pre-cooling device.

[0032] One technical effect of the embodiments of the present application is that through the technical solutions provided above, after the battery completes the cold start test, the battery can be quickly warmed up, which can avoid the water freezing due to the relatively low internal temperature of the battery and damage the battery.

[0033] Other features and advantages of the present application will become clear through the following detailed description of the exemplary embodiments of the present application with reference to the accompanying drawings. Description of the Drawings

[0034] The drawings incorporated in the specification and constituting a part of the specification illustrate embodiments of the present application and, together with the description, are used to explain the principles of the present application.

[0035] Figure 1 It is a schematic structural diagram of the warming device according to an embodiment of the present application;

[0036] Figure 2 It is a schematic structural diagram of the external circulation pipeline according to an embodiment of the present application;

[0037] Figure 3 It is a schematic structural diagram of the main pipeline according to an embodiment of the present application;

[0038] Figure 4 It is a schematic structural diagram of the internal circulation pipeline according to an embodiment of the present application;

[0039] Figure 5 It is a flowchart of the method of the warming device according to an embodiment of the present application.

[0040] Description of the reference numerals: warming device 100; internal circulation pipeline 1; first switching device 11; loop circulation pump 12; first water inlet 13; second water inlet 14; third water inlet 15; water outlet 16; external circulation pipeline 2; main pipeline 21; first pipeline 211; second pipeline 212; third pipeline 213; fourth pipeline 214; liquid storage device 215; heating device 216; pre-cooling device 217; warming pump 218; first branch pipeline 22; second branch pipeline 23; third branch pipeline 24; fourth branch pipeline 25; first solenoid valve 31; second solenoid valve 32; third solenoid valve 33; fourth solenoid valve 34; sixth solenoid valve 35; seventh solenoid valve 36; eighth solenoid valve 37; ninth solenoid valve 38; battery 5. Detailed Embodiments

[0041] Now, various exemplary embodiments of the present application will be described in detail with reference to the accompanying drawings. It should be noted that: Unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application.

[0042] The following description of at least one exemplary embodiment is merely illustrative and is in no way a limitation on the present application, its application, or its use.

[0043] Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such technologies, methods, and devices should be considered as part of the specification.

[0044] In all examples shown and discussed herein, any specific values should be construed as merely exemplary and not as a limitation. Thus, other examples of the exemplary embodiments may have different values.

[0045] It should be noted that like reference numerals and letters denote like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

[0046] According to a first aspect of an embodiment of the present application, there is provided a rewarming device 100 for fuel cell cold start testing, including:

[0047] A battery 5;

[0048] An outer circulation pipeline 2, on which a heating device 216 is provided, and the heating device 216 is configured to heat the liquid in the outer circulation pipeline 2 and maintain it at a first preset temperature;

[0049] An inner circulation pipeline 1, which is in communication with the battery 5, and a loop circulation pump is provided on the inner circulation pipeline 1, and the loop circulation pump is configured to drive the liquid in the inner circulation pipeline 1 and the battery 5 to flow;

[0050] The inner circulation pipeline 1 is in communication with the outer circulation pipeline 2 through a first water inlet 13 and a water outlet 16 provided on the inner circulation pipeline 1. A first switching device 11 is provided between the first water inlet 13 and the water outlet 16. The liquid in the outer circulation pipeline 2 flows through the first water inlet 13 to the battery 5, flows to the inner circulation pipeline after circulating in the battery, and flows out through the water outlet 16 to achieve circulation. The outer circulation pipeline 2 is configured to exchange heat for the inner circulation pipeline 1 through liquid circulation.

[0051] Such as Figure 1 、 Figure 2 、 Figure 3 And Figure 4As shown, the internal circulation pipeline 1 is connected to the battery 5. When the battery 5 undergoes a cold start test, the liquid will flow between the internal circulation pipeline 1 and the battery 5 and form a cycle. A loop circulation pump 12 is provided on the internal circulation pipeline 1, which can drive the liquid to flow in the internal circulation pipeline 1 and the battery 5. A first water inlet 13 and a water outlet 16 are provided on the internal circulation pipeline 1, and the external circulation pipeline 2 is connected to the first water inlet 13 and the water outlet. And a first switch device 11 is provided between the first water inlet 13 and the water outlet 16 of the internal circulation pipeline 1. When the first switch device 11 is in the closed state, the liquid flowing into the internal circulation pipeline 1 through the first water inlet 13 first flows towards the battery 5, and after circulating in the battery 5, it flows out through the water outlet 16. After the cold start of the battery 5 is completed, it is necessary to warm up the battery 5. At this time, first close the first switch device 11, then the liquid in the external circulation pipeline 2 enters the internal circulation pipeline 1 through the first water inlet 13. The liquid entering the internal circulation pipeline 1 preferentially flows towards the battery 5. After heat exchange and circulation in the battery 5, it flows out through the water outlet 16 and enters the external circulation pipeline 2. The liquid entering the external circulation pipeline 2 is heated by the heating device 216 and then flows into the internal circulation pipeline 1 again, thereby realizing the external and internal circulation to exchange heat for the battery 5 and make the battery 5 warm up.

[0052] Further explanation, the heating device 216 includes a warming plate and a heater. The heater can heat the liquid in the pipeline, and the warming plate can control and keep the liquid in the pipeline within the first preset temperature range. The heater can heat the liquid based on the principle that current flows through a resistance wire, which has the characteristics of being fast and convenient. Other heating methods can also be used as long as they can achieve heating of the liquid, and this application does not make restrictions.

[0053] Preferably, the first preset temperature is between 45°C and 55°C. Keeping it between 45°C and 55°C can enable the battery 5 to warm up quickly without damaging the battery 5 due to too high a temperature.

[0054] Optionally, the external circulation pipeline 2 includes a main pipeline 21, a first branch pipeline 22, and a second branch pipeline 23. One end of the first branch pipeline 22 and the second branch pipeline 23 are both connected to the main pipeline 21. The other end of the first branch pipeline 22 is connected to the first water inlet 13, and the other end of the second branch pipeline 23 is connected to the water outlet 16.

[0055] As Figure 2 and Figure 4As shown, the outer circulation pipeline 2 further includes a main pipeline 21, a first branch pipeline 22, and a second branch pipeline 23. One end of the first branch pipeline 22 is connected to the main pipeline 21, and the other end of the first branch pipeline 22 is connected to the first water inlet 13. A first solenoid valve 31 is provided on the first branch pipeline 22. When the first solenoid valve 31 is opened, the liquid in the main pipeline 21 can flow through the first branch pipeline 22 into the inner circulation pipeline 1. One end of the second branch pipeline 23 is connected to the main pipeline 21, and the other end of the second branch pipeline 23 is connected to the water outlet 16. A third solenoid valve 33 is provided on the second branch pipeline 23. When the third solenoid valve 33 is in the open state, the liquid in the inner circulation pipeline 1 can flow into the main pipeline 21 through the second branch pipeline 23. Preferably, the connection port of the second branch pipeline 23 and the main pipeline 21 is close to the heating device 216, facilitating the liquid after heat exchange to be quickly heated and then quickly flow back into the battery 5 for temperature recovery after flowing out of the inner circulation pipeline 1, achieving the effect of rapid temperature recovery and avoiding the liquid freezing after the battery 5 is quickly cooled, damaging the battery 5.

[0056] Optionally, a second water inlet 14 and a third water inlet 15 are provided on the inner circulation pipeline 1, a liquid storage device 215 is provided on the main pipeline 21, the liquid storage device 215 is connected to the second water inlet 14 and the third water inlet 15 through a third branch pipeline 24 and a fourth branch pipeline 25, the third branch pipeline 24 and the fourth branch pipeline 25 can be opened or closed, and the liquid in the liquid storage device 215 can flow through the third branch pipeline 24 and the fourth branch pipeline 25 to the inner circulation pipeline 1.

[0057] As Figure 2 and Figure 3 shown, a liquid storage device 215 is provided on the main pipeline 21.

[0058] In one embodiment, a second water inlet 14 and a third water inlet 15 are provided on the inner circulation pipeline 1. One end of the liquid storage device 215 is connected to the second water inlet 14 through a third branch pipeline 24, and a second solenoid valve 32 is provided on the third branch pipeline 24. The other end of the liquid storage device 215 is connected to the third water inlet 15 through a fourth branch pipeline 25, and a fourth solenoid valve 34 is provided on the fourth branch pipeline 25. When the battery 5 needs to be warmed up, the second solenoid valve 32 and the fourth solenoid valve 34 are opened, so that the liquid in the liquid storage device 215 flows into the inner circulation pipeline 1 through the third branch pipeline 24 and the fourth branch pipeline 25, replenishing the liquid in the inner circulation pipeline 1, enabling the liquid to quickly fill all the pipelines, achieving the effect of quickly warming up the battery 5, and improving the working efficiency. The provision of two liquid replenishing pipelines can quickly replenish the liquid into the inner circulation pipeline 1, enabling the liquid to quickly fill the entire pipeline, thereby further achieving the effect of quickly warming up the battery 5 and improving the working efficiency.

[0059] One or two water replenishing pipelines can be set, which can be selected according to the actual situation.

[0060] Optionally, the main pipeline 21 includes a first pipeline 211, a second pipeline 212 and a third pipeline 213 connected in sequence. The heating device 216 is arranged on the third pipeline 213, and both the first branch pipeline 22 and the second branch pipeline 23 are communicated with the third pipeline 213;

[0061] The liquid storage device 215 is arranged between the first pipeline 211 and the second pipeline 212;

[0062] Second switch devices are arranged on the first pipeline 211 and the second pipeline 212. When the battery 5 needs to be warmed up, the first pipeline 211 and the second pipeline 212 are closed.

[0063] As Figure 3 As shown, the main pipeline 21 includes a first pipeline 211, a second pipeline 212 and a third pipeline 213 connected in sequence. The first branch pipeline 22 is communicated with the third pipeline 213, and the second branch pipeline 23 is communicated with the third pipeline 213. The heating device 216 is arranged between the two connection ports where the third pipeline 213 communicates with the first branch pipeline 22 and the second branch pipeline 23. One end of the first pipeline 211 is connected to one end of the third pipeline 213, the other end of the first pipeline 211 is communicated with the liquid storage device 215, one end of the second pipeline 212 is communicated with the liquid storage device 215, and the other end of the second pipeline 212 is communicated with the other end of the third pipeline 213. A seventh electromagnetic valve 36 is arranged on the first pipeline 211, and an eighth electromagnetic valve 37 is arranged on the second pipeline 212. After the cold start of the battery 5 is completed and the battery 5 needs to be warmed up, the seventh electromagnetic valve 36 and the eighth electromagnetic valve 37 are closed. At this time, the liquid in the main pipeline 21 flows into the battery 5 through the first branch pipeline 22. After circulating in the battery 5, it flows into the main circulation pipeline from the second branch pipeline 23. At this time, the liquid flowing into the main pipeline 21 from the second branch pipeline 23 can flow into the battery 5 again only through the third pipeline 213, and the heating device 216 is also arranged on the third pipeline 213. Therefore, it can flow into the battery 5 again after passing through the heating device 216 at a shorter distance to warm up the battery 5, so as to realize the external and internal circulation and achieve the effect of quickly warming up the battery 5, and improve the working efficiency.

[0064] Optionally, the external circulation pipeline 2 further includes a warming pump 218. The warming pump 218 is arranged on the second pipeline 212, and the warming pump 218 is configured to drive the liquid in the external circulation pipeline 2 to flow.

[0065] As Figure 3As shown in the figure, a rewarming pump 218 is also provided on the outer circulation pipeline 2. The rewarming pump 218 is provided on the second pipeline 212, specifically between the eighth solenoid valve 37 and the junction of the second pipeline 212 and the third pipeline 213. When the outer circulation is started, the rewarming pump 218 is started simultaneously. The rewarming pump 218 drives the liquid in the main pipeline 21 to flow, so that the liquid in the outer circulation pipeline 2 is evenly heated. When the cold start of the battery 5 is completed and the battery 5 needs to be rewarmed, the rewarming pump 218 is turned off. At this time, there is no need for the liquid to flow in the outer circulation pipeline 2, so the circulation pump is turned off. The liquid only needs to flow in the inner circulation pipeline 1 through the loop circulation pump on the inner circulation pipeline 1.

[0066] Optionally, a pressure monitoring device, a temperature monitoring device, and a flow monitoring device are provided on the inner circulation pipeline 1.

[0067] As Figure 4 shown in the figure, a pressure monitoring device, a temperature monitoring device, and a flow monitoring device are provided on the inner circulation pipeline 1. Specifically, a pressure monitoring device and a temperature monitoring device are provided on the inner circulation pipeline 1 before the liquid enters the battery 5, for monitoring the pressure value and temperature of the liquid before entering the battery 5. The temperature monitoring device can ensure that the temperature in the pipeline can reach the first preset temperature. The pressure monitoring device can detect the pressure value entering the battery 5 so that the liquid can circulate in the pipeline. A pressure monitoring device, a temperature monitoring device, and a flow monitoring device are provided on the inner circulation pipeline 1 after the liquid flows out of the battery 5. The temperature monitoring device is used to monitor the temperature of the liquid flowing out after circulating in the battery 5, so as to facilitate confirming the rewarming situation of the battery 5, and finally it can be confirmed that the battery 5 has completed rewarming. The pressure monitoring device can detect the pressure value of the liquid flowing out of the battery 5, which can make the liquid circulate in the pipeline. The flow monitoring device is used to monitor the change in the flow rate of the liquid in the pipeline.

[0068] Preferably, the pressure monitoring device can adopt a pressure sensor, which has the characteristics of simple structure and convenient monitoring. Other existing devices that can detect the liquid pressure can also be used, and this application does not make any restrictions. The temperature monitoring device can adopt a thermometer, which has the characteristics of simple structure and convenient monitoring. Other existing devices that can detect the liquid temperature can also be used, and this application does not make any restrictions. The flow monitoring device can adopt a flowmeter, which has the characteristics of simple structure and convenient monitoring. Other existing devices that can detect the liquid flow rate value can also be used, and this application does not make any restrictions.

[0069] Optionally, the main pipeline 21 further includes a fourth pipeline 214. The fourth pipeline 214 is in a parallel relationship with the second pipeline 212 on the main pipeline 21, and the fourth pipeline 214 is connected to the inner circulation pipeline 1 through the third pipeline 213 and the first branch pipeline 22;

[0070] The warming device 100 further includes a pre-cooling device 217;

[0071] The pre-cooling device 217 is disposed on the fourth pipeline 214;

[0072] Third switching devices are disposed on both the third pipeline 213 and the fourth pipeline 214;

[0073] The pre-cooling device 217 is configured to provide a pre-cooling function for the battery 5;

[0074] When pre-cooling the battery 5 through the pre-cooling device 217, the third pipeline 213 is closed and the fourth pipeline 214 is opened.

[0075] As Figure 1 and Figure 3 shown, the main pipeline 21 further includes a fourth pipeline 214. A ninth solenoid valve 38 is disposed on the third pipeline 213, and the ninth solenoid valve 38 is disposed at one end close to the heating device 216. The fourth pipeline 214 forms a parallel relationship with the heating device 216 and the ninth solenoid valve 38 on the third pipeline 213. One end of the fourth pipeline 214 and the third pipeline 213 is communicated with the second branch pipeline 23, and the other end of the fourth pipeline 214 is connected to the third pipeline 213, wherein the connection port between the fourth pipeline 214 and the third pipeline 213 is disposed between the connection port where the ninth solenoid valve 38 is connected to the third pipeline 213 and the connection port where the second branch pipeline 23 is connected to the third pipeline 213, so as to realize the parallel relationship between the pre-cooling device 217 and the heating device 216 on the fourth pipeline 214. A pre-cooling device 217 and a sixth solenoid valve 35 are disposed on the fourth pipeline 214. After the battery 5 is communicated with the warming device 100 and before the battery 5 is tested, it is necessary to pre-cool the battery 5 within a third preset temperature first. At this time, the sixth solenoid valve 35 is opened and the ninth solenoid valve 38 is closed, so that the liquid flow direction is from the first branch pipeline 22 into the battery 5, circulates in the battery 5, then flows into the fourth pipeline 214 through the second branch pipeline 23, and then flows into the third pipeline 213 from the fourth pipeline 214 to realize circulation. Since the liquid is pre-cooled by the pre-cooling device 217, the temperature of the liquid in the pipeline can be reduced and maintained within the third preset temperature. The pre-cooling device 217 and the heating device 216 form a parallel relationship, so that the battery can complete pre-cooling, cold start test and warming in one device without switching pipelines, shortening the time of the cold start test, improving the efficiency, and ensuring that the battery will not be damaged due to untimely warming.

[0076] According to the second aspect of the embodiments of the present application, a preprocessing method for a warming device 100 for fuel cell cold start test is provided, including:

[0077] As Figure 5As shown, first, before testing the battery 5, open the first pipeline 211, the second pipeline 212, and the third pipeline 213, close the first branch pipeline 22, the second branch pipeline 23, the third branch pipeline 24, the fourth branch pipeline 25, and the fourth pipeline 214, and turn on the temperature recovery pump 218. The temperature inside the outer circulation pipeline 2 will be heated by the heating device 216 and maintained at the first preset temperature.

[0078] Then, turn on the loop circulation pump 12 and start the battery 5 test. Through the loop circulation pump, the liquid circulates between the inner circulation pipeline 1 and the battery 5.

[0079] Finally, after the battery 5 test is completed, turn off the temperature recovery pump 218, close the first pipeline 211 and the second pipeline 212, and open the first branch pipeline 22 and the second branch pipeline 23.

[0080] The liquid in the outer circulation pipeline 2 returns to the first branch pipeline 22 again through the first branch pipeline 22, the inner circulation pipeline 1, the battery 5, the second branch pipeline 23, and the heating device 216 until the battery 5 returns to the second preset temperature.

[0081] As Figure 1 and Figure 2 shown, before testing the battery 5, first preheat the outer circulation pipeline 2. Turn on the switch devices on the first pipeline 211, the second pipeline 212, and the third pipeline 213, close the first branch pipeline 22, the second branch pipeline 23, the third branch pipeline 24, the fourth branch pipeline 25, and the fourth pipeline 214, and turn on the temperature recovery pump 218. The temperature recovery pump 218 will drive the liquid to circulate in the main pipeline 21 and heat the liquid in the pipeline through the heating device 216 and maintain it at the first preset temperature.

[0082] Then, turn on the loop circulation pump 12 and start the battery 5 test. At this time, the battery 5 will generate liquid during the cold start process, and the liquid will flow in the inner loop circulation pipeline through the loop circulation pump 12.

[0083] Finally, after the cold start of the battery 5 is completed, turn off the warming pump 218, close the switching devices on the first pipeline 211 and the second pipeline 212, open the switching devices on the first branch pipeline 22 and the second branch pipeline 23, and close the first switching device 11. At this time, the liquid in the main pipeline 21 flows into the internal circulation pipeline 1 through the first branch pipeline 22. Since the first switching device 11 is in the closed state, the liquid flowing into the internal circulation pipeline 1 preferentially flows into the battery 5. After circulating in the battery 5, it flows into the main pipeline 21 from the second branch pipeline 23 through the internal circulation pipeline 1. The liquid entering the main pipeline 21 is warmed up by the heating device 216, and the warmed-up liquid flows into the internal circulation pipeline 1 again through the first branch pipeline 22. In this cycle, heat energy is provided for the battery 5, enabling the battery 5 to quickly warm up, thereby avoiding damage to the battery 5 caused by liquid freezing after the cold start of the battery 5.

[0084] Optionally, after the battery 5 test is completed, turn off the warming pump 218, close the first pipeline 211 and the second pipeline 212, open the first branch pipeline 22 and the second branch pipeline 23, and open the third branch pipeline 24 and / or the fourth branch pipeline 25;

[0085] The liquid in the external circulation pipeline 2 returns to the first branch pipeline 22 again through the first branch pipeline 22, the internal circulation pipeline 1, the battery 5, the second branch pipeline 23, and the heating device 216. The liquid in the liquid storage device 215 replenishes the liquid in the internal circulation pipeline 1 through the third branch pipeline 24 and / or the fourth branch pipeline 25 until the battery 5 warms up to the second preset temperature.

[0086] As Figure 1 and Figure 2 shown, in another embodiment, finally, after the cold start of the battery 5 is completed, turn off the warming pump 218, close the switching devices on the first pipeline 211 and the second pipeline 212, open the switching devices on the first branch pipeline 22, the second branch pipeline 23, the third branch pipeline 24, and the fourth branch pipeline 25, and close the first switching device 11. At this time, the liquid in the main pipeline 21 flows into the internal circulation pipeline 1 through the first branch pipeline 22. Since the first switching device 11 is in the closed state, the liquid flowing into the internal circulation pipeline 1 preferentially flows into the battery 5. After circulating in the battery 5, it flows into the main pipeline 21 from the second branch pipeline 23 through the internal circulation pipeline 1. The liquid entering the main pipeline 21 is warmed up by the heating device 216, and the warmed-up liquid flows into the internal circulation pipeline 1 again through the first branch pipeline 22. The liquid in the liquid storage device 215 will flow into the internal circulation pipeline 1 through the third branch pipeline 24 and / or the fourth branch pipeline 25 to replenish the liquid in the pipeline, enabling the battery 5 to quickly warm up. In this cycle, heat energy is provided for the battery 5, enabling the battery 5 to quickly warm up, thereby avoiding damage to the battery 5 caused by liquid freezing after the cold start of the battery 5.

[0087] Optionally, before testing the battery 5, turn on the first pipeline 22, the second pipeline 23, and the fourth pipeline 214, turn off the first switch device 11, and keep the battery 5 within the third preset temperature through the precooling device 217.

[0088] As Figure 1 shown, since the battery 5 is placed in an environment of the third preset temperature for cooling, after the battery 5 is connected to the temperature recovery device 100 and before the external circulation pipeline 2 is heated, it is necessary to first precool the temperature inside the battery 5 to the third preset temperature. At this time, turn on the fourth pipeline 214, the first pipeline 22, and the second pipeline 23, turn off the ninth solenoid valve 38, and turn off the first pipeline 211 and the second pipeline 212. At this time, the flow direction of the liquid is to enter the battery 5 from the first pipeline 22, circulate in the battery 5, and then flow into the fourth pipeline 214 through the second pipeline 23, and then flow into the third pipeline 213 from the fourth pipeline 214 to achieve circulation. Because the liquid is precooled by the precooling device 217, the temperature of the liquid in the pipeline can be reduced and kept within the third preset temperature, so that the temperature inside the battery 5 can be kept within the third preset temperature.

[0089] Although some specific embodiments of the present application have been described in detail by way of examples, those skilled in the art should understand that the above examples are only for illustration and not for limiting the scope of the present application. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A rewarming device for fuel cell cold start test, characterized in that, Comprising: a battery; an external circulation pipeline, a heating device is arranged on the external circulation pipeline, and the heating device is configured to heat the liquid in the external circulation pipeline and maintain it at a first preset temperature; an internal circulation pipeline, the internal circulation pipeline is communicated with the battery, a loop circulation pump is arranged on the internal circulation pipeline, and the loop circulation pump is configured to drive the liquid in the internal circulation pipeline and the battery to flow; the internal circulation pipeline and the external circulation pipeline are communicated through a first water inlet and a water outlet arranged on the internal circulation pipeline, a first switching device is arranged between the first water inlet and the water outlet, the liquid in the external circulation pipeline flows to the battery through the first water inlet, flows to the internal circulation pipeline after circulating in the battery, and flows out through the water outlet to realize circulation, and the external circulation pipeline is configured to exchange heat for the internal circulation pipeline through liquid circulation; the external circulation pipeline includes a main pipeline, a first branch pipeline and a second branch pipeline, one ends of the first branch pipeline and the second branch pipeline are both communicated with the main pipeline, the other end of the first branch pipeline is communicated with the first water inlet, and the other end of the second branch pipeline is communicated with the water outlet; a liquid storage device is arranged on the main pipeline, the main pipeline includes a first pipeline, a second pipeline and a third pipeline connected in sequence, the heating device is arranged on the third pipeline, and the first branch pipeline and the second branch pipeline are both communicated with the third pipeline; the liquid storage device is arranged between the first pipeline and the second pipeline; second switching devices are arranged on the first pipeline and the second pipeline, and when the battery needs to be warmed up, the first pipeline and the second pipeline are closed.

2. The rewarming device according to claim 1, wherein, a second water inlet and a third water inlet are arranged on the internal circulation pipeline, the liquid storage device is communicated with the second water inlet through a third branch pipeline, a second solenoid valve is arranged on the third branch pipeline, the liquid storage device is communicated with the third water inlet through a fourth branch pipeline, a fourth solenoid valve is arranged on the fourth branch pipeline, the third branch pipeline and the fourth branch pipeline can be opened or closed, and the liquid in the liquid storage device can flow to the internal circulation pipeline through the third branch pipeline and the fourth branch pipeline.

3. The rewarming device according to claim 1, characterized in that, the external circulation pipeline further includes a warming pump, the warming pump is arranged on the second pipeline, and the warming pump is configured to drive the liquid in the external circulation pipeline to flow.

4. The rewarming device according to claim 1, wherein, a pressure monitoring device, a temperature monitoring device and a flow monitoring device are arranged on the internal circulation pipeline.

5. The warming device according to claim 1, wherein the main pipeline further includes a fourth pipeline, the fourth pipeline is in a parallel relationship with the second pipeline on the main pipeline, and the fourth pipeline is communicated with the internal circulation pipeline through the third pipeline and the first branch pipeline; the warming device further includes a precooling device; the precooling device is arranged on the fourth pipeline; third switching devices are arranged on the third pipeline and the fourth pipeline; the precooling device is configured to provide a precooling function for the battery; when the battery is precooled by the precooling device, the third pipeline is closed and the fourth pipeline is opened.

6. A preprocessing method using the rewarming device described in claim 5, for fuel cell cold start testing, characterized in that, Including: A second water inlet and a third water inlet are provided on the inner circulation pipeline. The liquid storage device is communicated with the second water inlet through a third pipeline, and the liquid storage device is communicated with the third water inlet through a fourth pipeline. The third pipeline and the fourth pipeline can be opened or closed, and the liquid in the liquid storage device can flow to the inner circulation pipeline through the third pipeline and the fourth pipeline. The outer circulation pipeline further includes a temperature recovery pump, and the temperature recovery pump is arranged on the second pipeline and is configured to drive the liquid in the outer circulation pipeline to flow. First, before the battery test, open the first pipeline, the second pipeline and the third pipeline, close the first branch pipeline, the second branch pipeline, the third pipeline, the fourth pipeline and the fourth pipeline, and turn on the temperature recovery pump. The temperature in the outer circulation pipeline will be heated by the heating device and maintained at a first preset temperature. Secondly, turn on the loop circulation pump and start the battery test. Through the loop circulation pump, the liquid circulates between the inner circulation pipeline and the battery. Then, after the battery test is completed, turn off the temperature recovery pump, close the first pipeline and the second pipeline, and open the first branch pipeline and the second branch pipeline. The liquid in the outer circulation pipeline flows back to the first branch pipeline again through the first branch pipeline, the inner circulation pipeline, the battery, the second branch pipeline and the heating device until the battery returns to a second preset temperature.

7. The pretreatment method according to claim 6, wherein after the battery test is completed, turn off the temperature recovery pump, close the first pipeline and the second pipeline, open the first branch pipeline and the second branch pipeline, and open the third pipeline and / or the fourth pipeline; the liquid in the outer circulation pipeline returns to the first branch pipeline again through the first branch pipeline, the inner circulation pipeline, the battery, the second branch pipeline and the heating device, and the liquid in the liquid storage device replenishes the liquid into the inner circulation pipeline through the third pipeline and / or the fourth pipeline until the battery returns to a second preset temperature.

8. The pretreatment method according to any one of claims 6-7, characterized in that Before the battery test, open the first branch pipeline, the second branch pipeline and the fourth pipeline, close the first switch device, and keep the battery within a third preset temperature through the pre-cooling device.

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