Circulating cooling device in environmental chamber and galvanic pile test system

Abstract

The utility model discloses an in-cabin circulating cooling device of an environmental cabin and a galvanic pile test system. The in-cabin circulating cooling device comprises a circulating pipeline communicated with a galvanic pile cooling flow channel; the circulating pump is arranged on the circulating pipeline; the liquid storage container is communicated with the circulating pipeline; the cooling assembly comprises a cooling branch and a heat exchanger which are communicated with the circulation loop; the valve control assembly comprises a plurality of electromagnetic valves arranged on the circulation pipeline and is used for controlling the communication state between the circulation pipeline and the galvanic pile cooling flow channel and the communication state between the cooling branch and the circulation loop; the temperature and pressure signal acquisition assembly comprises a temperature sensor and a pressure sensor; the control assembly is in control connection with the valve control assembly and the circulating pump, receives and responds to the temperature detection signal and the pressure detection signal, and controls the working states of the valve control assembly and the circulating pump; according to the whole system, the in-cabin circulating cooling device is matched with the out-cabin system test board, so that the functions of cooling and rapid switching of cooling liquid during the low-temperature adaptability test of the galvanic pile and the like can be realized.

Description

Technical Field

[0001] The utility model relates to the technical field of power battery testing, and more specifically, to an in-cabin circulating cooling device for an environmental chamber and a stack testing system. Background Art

[0002] Proton exchange membrane fuel cells have the advantages of high efficiency, cleanliness, zero emissions, etc., and have broad application prospects. In actual applications, 40% - 60% of the chemical energy of the fuel of PEMFC is converted into electrical energy, and most of the remaining energy is converted into heat energy. If the heat cannot be discharged from the battery in time, the system temperature will continue to rise, resulting in over-temperature phenomena in local single cells or local areas inside the battery, seriously affecting the normal operation of the fuel cell. There are mainly three heat dissipation paths for fuel cells: the vaporization heat dissipation of the water vapor generated inside the fuel cell, the radiation heat dissipation of the stack, and the heat taken away by the circulating cooling medium. Among them, the heat taken away by the circulating cooling medium is the main heat dissipation path for fuel cells, including air cooling and liquid cooling. The specific working principle is as follows: independent cooling channels are designed between the cathode and anode plates of the fuel cell stack, and the heat generated during the operation of the fuel cell is taken away by relying on the forced convective heat transfer of the cooling air or coolant.

[0003] Before being put on the market, fuel cells need to undergo various tests, including the temperature test of the stack, such as low-temperature cold start and low-temperature adaptability tests. Currently, the above tests generally place the stack to be tested in an environmental chamber, and then use an external temperature control system, such as a circulating cooling system, etc. to adjust the temperature of the stack. However, during the test process, the coolant cannot be cooled quickly, and the temperature of the coolant introduced into the stack is also difficult to switch quickly, thus unable to simulate and test the low-temperature cold start and low-temperature adaptability performance of the stack well. Summary of the Utility Model

[0004] Aiming at the problem that the circulating system cannot quickly provide low-temperature coolant and has a slow temperature switching response during the current stack temperature test, which affects the test results, the first object of this application is to propose an in-cabin circulating cooling device for an environmental chamber, which is built in the environmental chamber and is mainly used for functions such as cooling and quick switching of the coolant during the low-temperature cold start and low-temperature adaptability tests of the stack. Based on the above in-cabin circulating cooling device, the second object of this application is to propose a stack testing system. The specific solutions are as follows:

[0005] An in-cabin circulating cooling device for an environmental chamber is arranged inside the environmental chamber and includes:

[0006] A circulating pipeline configured to be connected to the cooling channels of the stack to form a circulation loop;

[0007] A circulating pump is arranged on the circulating pipeline and is used to drive the coolant in the circulating pipeline to flow in a set direction;

[0008] A liquid storage container, configured to be connected to the circulation pipeline and storing coolant inside;

[0009] A cooling component, including a cooling branch connected to the circulation loop and a heat exchanger provided on the cooling branch, which is heat-exchange connected to an external refrigeration system to achieve heat exchange with the external refrigeration system;

[0010] A valve control component, including a plurality of solenoid valves provided on the circulation pipeline, respectively used to control the connection state between the circulation pipeline and the coolant flow channels of the fuel cell stack, and the connection state between the cooling branch and the circulation loop;

[0011] A temperature and pressure signal acquisition component, including at least one temperature sensor and pressure sensor provided on the circulation loop, respectively used to detect and output the temperature detection signal and pressure detection signal of the coolant in the circulation loop;

[0012] A control component, configured to be signal-connected to the temperature and pressure signal acquisition component, and control-connected to the valve control component and the circulation pump, receive and respond to the temperature detection signal and pressure detection signal, and control the working states of the valve control component and the circulation pump.

[0013] Through the above technical solution, the entire circulation cooling device is located inside the environmental chamber body, and the temperature in the environmental chamber can be used to pre-cool the pipeline and liquid storage device of the cooling device, so that the coolant temperature is consistent with the environmental chamber temperature at the initial stage of fuel cell stack testing; by using the valve control component and the cooling component, the temperature and flow rate of the coolant in the circulation pipeline can be quickly adjusted, and then the temperature in the coolant flow channels of the fuel cell stack can be accurately and quickly adjusted, realizing functions such as low-temperature cold start of the fuel cell stack and temperature reduction and rapid switching of the coolant during low-temperature adaptability tests.

[0014] Further, the valve control component includes:

[0015] A first solenoid valve, provided at the liquid inlet end of the circulation pipeline, used to control the liquid inlet conduction state of the circulation pipeline;

[0016] A second solenoid valve, provided at the liquid outlet end of the circulation pipeline, used to control the liquid outlet conduction state of the circulation pipeline;

[0017] A third solenoid valve, configured as a three-way reversing valve, provided between the circulation loop and the cooling branch, used to control the selection state of the cooling branch;

[0018] A check valve, provided at the liquid outlet end of the cooling branch and the conduction direction is away from the third solenoid valve towards the heat exchanger.

[0019] Through the above technical solution, the flow rate and temperature of the coolant entering the cooling channel of the stack can be adjusted by controlling the on-off state of each solenoid valve body and combining the pumping power of the circulating pump, thereby realizing rapid regulation of the temperature of the stack. Due to the presence of the third solenoid valve and the entire circulating cooling device located inside the environmental chamber, when the cooling branch is cut off, the stack can use the temperature inside the environmental chamber to enter the circulation loop for cooling, and when the cooling branch is turned on, it can further use the external refrigeration system for cooling, which can achieve the effects of low-temperature cold start of the stack and low-temperature adaptability test, cooling the coolant and rapid switching.

[0020] Furthermore, the heat exchanger is configured as a plate heat exchanger built into a heat exchange housing, and two heat exchange circuits in the plate heat exchanger are respectively connected to an external cooling system and the cooling branch;

[0021] The heat exchange shell is built in the environmental chamber.

[0022] Through the above technical solution, the coolant in the circulation pipeline can be quickly cooled down. At the same time, before the test starts, the circulation pump can be used to pre-cool the coolant in the circulation pipeline to the same temperature as the environmental chamber temperature.

[0023] Furthermore, the liquid storage container is arranged inside the environmental chamber, and a fourth solenoid valve for adjusting the flux between the liquid storage container and the circulation pipeline is arranged between the liquid storage container and the circulation pipeline, and the fourth solenoid valve is control-connected to the control component;

[0024] The connection node between the liquid storage container and the circulation pipeline is located between the first solenoid valve and the circulation pump.

[0025] Through the above technical solution, the circulation pump can be used to effectively adjust the coolant flow and pressure in the circulation pipeline, making the temperature regulation of the fuel cell stack more accurate and rapid.

[0026] Furthermore, the coolant in the circulation pipeline is configured as an ethylene glycol solution;

[0027] The temperature sensors are configured in at least two and are respectively located at the liquid inlet end and the liquid outlet end of the circulation pipeline.

[0028] Through the above technical solution, the rapid cooling of the battery stack can be achieved. At the same time, multiple temperature sensors can accurately detect the temperature of each point on the circulation pipeline, which is beneficial to the temperature control of the entire circulation cooling device.

[0029] A battery stack test system comprises an environmental chamber body, wherein the environmental chamber body is provided with a placement table for placing a battery stack to be tested, and a liquid inlet pipe and a liquid outlet pipe connected to an external system test bench, wherein the liquid inlet pipe and the liquid outlet pipe are respectively connected to a liquid inlet and a liquid outlet of a cooling flow channel inside the battery stack to be tested;

[0030] A fifth solenoid valve and a sixth solenoid valve are respectively arranged on the liquid inlet pipe and the liquid outlet pipe, and both the fifth solenoid valve and the sixth solenoid valve are connected to the system controller for control;

[0031] The above-mentioned in-cabin circulating cooling device of the environmental chamber is also arranged inside the environmental chamber body;

[0032] Wherein, the liquid inlet end and the liquid outlet end of the circulating pipeline of the in-cabin circulating cooling device of the environmental chamber are respectively communicated with the liquid inlet pipe and the liquid outlet pipe.

[0033] Through the above technical solution, by combining the external system test bench with the in-cabin circulating cooling device of the environmental chamber, the temperature of the fuel cell stack to be tested can be adjusted more flexibly, with a fast response speed and a short interval time for mode switching.

[0034] Further, the external system test bench includes a coolant circulation system, and a system cooling pipeline is arranged outside the coolant circulation system to form an independent coolant circulation path. Both the liquid inlet pipe and the liquid outlet pipe are connected to the system cooling pipeline and form two connection points;

[0035] A seventh solenoid valve is arranged on the system cooling pipeline between the two above-mentioned connection points, and the seventh solenoid valve is connected to the system controller for control.

[0036] Through the above technical solution, the external system test bench can provide coolant at a set temperature. By controlling the on-off of the seventh solenoid valve, the flow rate of the coolant entering the fuel cell stack to be tested can be switched flexibly and quickly, realizing the adjustment and control of the fuel cell stack temperature.

[0037] Further, the seventh solenoid valve is configured as an electromagnetic throttle valve.

[0038] Through the above technical solution, the flow rate of the coolant entering the fuel cell stack to be tested can be controlled by controlling the flow rate of the coolant in the system cooling pipeline.

[0039] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0040] (1) By arranging the circulating cooling device inside the environmental chamber body, the temperature in the environmental chamber can be used to pre-cool the pipeline and the liquid storage device of the cooling device, so that the coolant temperature is consistent with the environmental chamber temperature at the initial stage of the fuel cell stack test; by using the valve control component and the cooling component, the temperature and flow rate of the coolant in the circulating pipeline can be adjusted quickly, and then the temperature in the fuel cell stack cooling flow channel can be adjusted accurately and quickly, realizing the low-temperature cold start of the fuel cell stack.

[0041] (2) The whole system can realize functions such as the cooling and quick switching of the coolant during the low-temperature adaptability test of the fuel cell stack by cooperating the in-cabin circulating cooling device with the out-of-cabin system test bench. Brief Description of the Drawings

[0042] Figure 1 This is the overall schematic diagram of the present application.

[0043] Reference Numerals: 1, circulation pipeline; 2, circulation pump; 3, liquid storage container; 4, cooling assembly; 41, heat exchanger; 42, cooling branch; 51, first solenoid valve; 52, second solenoid valve; 53, third solenoid valve; 54, fourth solenoid valve; 55, check valve; 7, environmental chamber body; 8, liquid inlet pipe; 9, liquid outlet pipe; 10, coolant circulation path; 11, seventh solenoid valve; 12, external system test bench; 13, external refrigeration system; 14, fuel cell stack to be tested; 15, fifth solenoid valve; 16, sixth solenoid valve. Detailed Embodiments

[0044] The present application will be further described in detail below in conjunction with embodiments and the accompanying drawings. However, the embodiments of the present utility model are not limited thereto.

[0045] An in-cabin circulation cooling device for an environmental chamber, as Figure 1 shown, is arranged inside the environmental chamber and mainly includes a circulation pipeline 1, a circulation pump 2, a liquid storage container 3, a cooling assembly 4, a valve control assembly, a temperature and pressure signal acquisition assembly, and a control assembly.

[0046] The integrated test environmental chamber for the fuel cell vehicle power system has been publicly disclosed in the prior art. Its specific structure and functions, such as explosion-proof structure, hydrogen detection and alarm, etc., will not be elaborated in the embodiments of the present application.

[0047] As Figure 1 shown, the circulation pipeline 1 is configured to be connected to the fuel cell stack cooling channel to form a circulation loop. The above-mentioned circulation pipeline 1 adopts SUS316 pipeline. The circulation pump 2 is arranged on the circulation pipeline 1 and is used to drive the coolant in the circulation pipeline 1 to flow in a set direction. The liquid storage container 3 is configured to be connected to the circulation pipeline 1 and stores coolant inside. In the embodiments of the present application, the above-mentioned coolant adopts an ethylene glycol solution with a concentration ratio of 60% to achieve a good cooling effect.

[0048] The cooling assembly 4 includes a cooling branch 42 connected to the circulation loop and a heat exchanger 41 arranged on the cooling branch 42, which is heat-exchange connected to the external refrigeration system 13 to realize heat exchange with the external refrigeration system 13. As Figure 1 shown, the heat exchanger 41 is configured as a plate heat exchanger built into the heat exchange housing. The two heat exchange circuits in the plate heat exchanger are respectively connected to the external cooling system and the cooling branch 42. The whole heat exchange housing is built into the environmental chamber to quickly cool the coolant in the circulation pipeline 1. At the same time, before the test starts, the coolant in the circulation pipeline 1 can be pre-cooled to the same temperature as the environmental chamber temperature by using the circulation pump 2.

[0049] In an embodiment of the present application, the valve control assembly includes a plurality of solenoid valves disposed on the circulation pipeline 1, which are respectively used to control the connection state between the circulation pipeline 1 and the coolant flow channel of the stack, and the connection state between the cooling branch 42 and the circulation loop.

[0050] Specifically, the above valve control assembly includes a first solenoid valve 51, a second solenoid valve 52, a third solenoid valve 53, a fourth solenoid valve 54 and a check valve 55. Among them, the first solenoid valve 51 is disposed at the liquid inlet end of the circulation pipeline 1, that is, the end where the coolant flows out from the cooling flow channel of the stack to be tested, and is used to control the liquid inlet conduction state of the circulation pipeline 1. The second solenoid valve 52 is disposed at the liquid outlet end of the circulation pipeline 1 and is used to control the liquid outlet conduction state of the circulation pipeline 1. Through the cooperation of the first solenoid valve 51 and the second solenoid valve 52, the circulation pipeline 1 can be separated from the stack to be tested 14.

[0051] The third solenoid valve 53 is configured as a three-way reversing valve and is disposed between the circulation loop and the cooling branch 42, and is used to control the selection state of the cooling branch 42. The check valve 55 is disposed at the liquid outlet end of the cooling branch 42 and the conduction direction is the direction away from the third solenoid valve 53 of the heat exchanger 41, so as to prevent the coolant in the cooling branch 42 from flowing back.

[0052] The liquid storage container 3 is disposed inside the environmental chamber. The fourth solenoid valve 54 is disposed between the liquid storage container 3 and the circulation pipeline 1 and is used to adjust the flux between the two. The fourth solenoid valve 54 is controlled and connected to the control component. The connection node between the liquid storage container 3 and the circulation pipeline 1 is located between the first solenoid valve 51 and the circulation pump 2. In a specific embodiment, the fourth solenoid valve 54 can be configured as a flow regulating valve.

[0053] The above technical solution can adjust the flow rate and temperature of the coolant introduced into the coolant flow channel of the stack by controlling the on-off states of the solenoid valve bodies of each solenoid valve and combining the pumping power or frequency of the circulation pump 2, so as to realize the rapid adjustment of the stack temperature. Preferably, the flow control range is 0 L / min to 110 L / min; the temperature range is -50 °C to 85 °C.

[0054] The temperature and pressure signal acquisition component includes at least one temperature sensor and pressure sensor disposed on the circulation loop, which are respectively used to detect and output the temperature detection signal and pressure detection signal of the coolant in the circulation loop. In an embodiment of the present application, two temperature sensors are configured and are respectively located at the liquid inlet end and the liquid outlet end of the circulation pipeline 1, and are used to detect the temperature change of the coolant entering and leaving the stack to be tested 14. Combining the detection output of the pressure sensor, the pumping frequency or power of the circulation pump 2 is controlled, so as to adjust the flow rate and pressure of the coolant in the circulation pipeline 1.

[0055] The control component is configured to be signal-connected to the temperature and pressure signal acquisition component. Preferably, a PLC or single-chip microcomputer control module is adopted, which is control-connected to the valve control component and the circulation pump 2, receives and responds to the temperature detection signal and the pressure detection signal, and controls the working states of the valve control component and the circulation pump 2 based on the built-in control program module, such as the opening and closing of each valve body and the pumping frequency parameter of the circulation pump 2, etc. By using the valve control component and the cooling component 4, the temperature and flow rate of the coolant in the circulation pipeline 1 can be quickly adjusted, and then the temperature in the coolant flow channel of the fuel cell stack can be accurately and quickly adjusted, realizing functions such as the low-temperature cold start of the fuel cell stack and the cooling and rapid switching of the coolant during the low-temperature adaptability test.

[0056] Based on the above in-cabin circulation cooling device of the environmental chamber, the present application also proposes a fuel cell stack test system, as Figure 1 shown, which includes an environmental chamber body 7. Inside the environmental chamber body 7, there is a placement table for placing the fuel cell stack 14 to be tested, as well as a liquid inlet pipe 8 and a liquid outlet pipe 9 that are connected to an external system test bench 12. During the test, the liquid inlet pipe 8 and the liquid outlet pipe 9 are respectively connected to the liquid inlet and outlet of the cooling flow channel inside the fuel cell stack 14 to be tested. A fifth solenoid valve 15 and a sixth solenoid valve 16 are respectively arranged on the liquid inlet pipe 8 and the liquid outlet pipe 9, and both the fifth solenoid valve 15 and the sixth solenoid valve 16 are control-connected to the system controller. As Figure 1 shown, the in-cabin circulation cooling device of the environmental chamber as described above is also arranged inside the environmental chamber body 7. Among them, the liquid inlet end and the liquid outlet end of the circulation pipeline 1 of the in-cabin circulation cooling device of the environmental chamber are respectively connected to the liquid inlet pipe 8 and the liquid outlet pipe 9. Based on the above technical solution, by combining the external system test bench 12 with the in-cabin circulation cooling device of the environmental chamber, the temperature of the fuel cell stack 14 to be tested can be adjusted more flexibly, with a fast response speed and a short interval time for mode switching.

[0057] Combined with the currently disclosed prior art, the external system test bench 12 includes a coolant circulation system. An independent coolant circulation path 10 is formed by arranging a system cooling pipeline outside the coolant circulation system. Both the liquid inlet pipe 8 and the liquid outlet pipe 9 are connected to the system cooling pipeline and form two connection points. A seventh solenoid valve 11 is arranged between the two above-mentioned connection points on the system cooling pipeline, and the seventh solenoid valve 11 is control-connected to the system controller. Preferably, the seventh solenoid valve 11 is configured as an electromagnetic throttle valve.

[0058] The above system controller can be configured as a PLC control module.

[0059] According to the above technical solution, the external system test bench 12 can provide coolant at a set temperature. By controlling the on-off of the seventh solenoid valve 11, the flow rate of the coolant entering the fuel cell stack 14 to be tested can be flexibly and quickly switched, realizing the adjustment and control of the fuel cell stack temperature.

[0060] The above are only the preferred embodiments of the present utility model, and the protection scope of the present utility model is not limited to the above embodiments. All technical solutions falling within the concept of the present utility model belong to the protection scope of the present utility model. It should be noted that for those of ordinary skill in the art, several improvements and refinements made without departing from the principle of the present utility model should also be regarded as within the protection scope of the present utility model.

Claims

1. A circulating cooling device in an environmental chamber, characterized in that: Installed in the environmental chamber, including: A circulation pipeline (1) is configured to be connected to the stack cooling channel to form a circulation loop; A circulation pump (2), arranged on the circulation pipeline (1), and used for driving the coolant in the circulation pipeline (1) to flow; A liquid storage container (3), configured to be in communication with the circulation pipeline (1), and containing cooling liquid; A cooling assembly (4) comprising a cooling branch (42) connected to the circulation loop and a heat exchanger (41) disposed on the cooling branch (42) and connected to an external refrigeration system (13) for heat exchange; A valve control component, comprising a plurality of solenoid valves arranged on a circulation pipeline (1), which are respectively used to control the connection state between the circulation pipeline (1) and a stack cooling channel, and the connection state between a cooling branch (42) and a circulation loop; The temperature and pressure signal acquisition component includes at least one temperature sensor and a pressure sensor arranged on the circulation loop, which are used to detect and output the temperature detection signal and the pressure detection signal of the coolant in the circulation loop respectively; The control component is configured to be signal-connected to the temperature and pressure signal acquisition component and to be control-connected to the valve control component and the circulation pump (2), to receive and respond to the temperature detection signal and the pressure detection signal, and to control the working state of the valve control component and the circulation pump (2).

2. The in-cabin circulation cooling device of the environmental chamber according to claim 1, characterized in that: The valve control assembly comprises: A first solenoid valve (51) is arranged at the liquid inlet end of the circulation pipeline (1) and is used to control the liquid inlet conduction state of the circulation pipeline (1); A second solenoid valve (52) is arranged at the liquid outlet end of the circulation pipeline (1) and is used to control the liquid outlet conduction state of the circulation pipeline (1); A third solenoid valve (53) configured as a three-way reversing valve, disposed between the circulation loop and the cooling branch (42), and used to control the gating state of the cooling branch (42); The one-way valve (55) is arranged at the liquid outlet end of the cooling branch (42) and the conducting direction is the direction in which the heat exchanger (41) is away from the third solenoid valve (53).

3. The in-cabin circulation cooling device of the environmental chamber according to claim 1, characterized in that: The heat exchanger (41) is configured as a plate heat exchanger built into a heat exchange housing, and two heat exchange circuits in the plate heat exchanger are respectively connected to an external cooling system and the cooling branch (42); The heat exchange shell is built in the environmental chamber.

4. The in-cabin circulation cooling device of the environmental chamber according to claim 1, characterized in that: The liquid storage container (3) is arranged inside the environmental chamber, and a fourth solenoid valve (54) for adjusting the flux between the liquid storage container (3) and the circulation pipeline (1) is arranged between the liquid storage container (3) and the circulation pipeline (1), and the fourth solenoid valve (54) is controllably connected to the control component; The connection node between the liquid storage container (3) and the circulation pipeline (1) is located between the first solenoid valve (51) and the circulation pump (2).

5. The in-cabin circulation cooling device of the environmental chamber according to claim 1, characterized in that: The coolant in the circulation pipeline (1) is configured as an ethylene glycol solution; The temperature sensors are configured in at least two numbers and are respectively located at the liquid inlet end and the liquid outlet end of the circulation pipeline (1).

6. A battery stack testing system, comprising an environmental chamber body (7), characterized in that: The environmental chamber body (7) is provided with a placement table for placing the battery stack to be tested (14), as well as a liquid inlet pipe (8) and a liquid outlet pipe (9) connected to an external system test bench (12); the liquid inlet pipe (8) and the liquid outlet pipe (9) are respectively connected to a liquid inlet and a liquid outlet of a cooling channel inside the battery stack to be tested (14); The liquid inlet pipe (8) and the liquid outlet pipe (9) are respectively provided with a fifth solenoid valve (15) and a sixth solenoid valve (16), and the fifth solenoid valve (15) and the sixth solenoid valve (16) are both control-connected to the system controller; The environmental chamber body (7) is further provided with an environmental chamber internal circulation cooling device as claimed in any one of claims 1 to 5; The liquid inlet end and the liquid outlet end of the circulating pipeline (1) of the circulating cooling device in the environmental chamber are respectively connected to the liquid inlet pipe (8) and the liquid outlet pipe (9).

7. The battery stack testing system according to claim 6, characterized in that: The external system test bench (12) includes a coolant circulation system, a system cooling pipeline is arranged outside the coolant circulation system to form an independent coolant circulation passage (10), and the liquid inlet pipe (8) and the liquid outlet pipe (9) are both connected to the system cooling pipeline to form two connection points; The system cooling pipeline is provided with a seventh solenoid valve (11) between the two connection points, and the seventh solenoid valve (11) is control-connected to the system controller.

8. The battery stack testing system according to claim 7, characterized in that: The seventh solenoid valve (11) is configured as an electromagnetic throttle valve.

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