Blocking plate structure for detecting internal leakage of electric pile cooling path and detection system with blocking plate structure

Abstract

The utility model relates to the field of galvanic pile testing equipment, in particular to a blocking plate structure for detecting inner leakage of a galvanic pile cooling path and a detection system with the blocking plate structure, which comprises a blocking plate body provided with a cooling path reserved through hole; a fastening part is arranged on the blocking plate body; the fastening part comprises a bolt hole formed in the blocking plate body; according to the utility model, through the arrangement of the blocking plate structure, subsequent blocking of an air path and a hydrogen path of the electric pile is facilitated, and independent air supply operation of a cooling path is realized; and subsequent detection operation is facilitated.

Description

Technical Field

[0001] The utility model relates to the field of battery stack testing equipment, in particular to a blocking plate structure for detecting internal leakage in a battery stack cooling path and a detection system with the blocking plate structure. Background Art

[0002] In recent years, proton exchange membrane fuel cells (PEMFCs) have garnered widespread attention and application due to their high efficiency, fast startup, and pollution-free products. The production of fuel cell stacks has increased annually. However, because the stack reaction involves hydrogen, its sealing is subject to strict control.

[0003] During the process of battery stack being taken offline, defects in components such as bipolar plates and membrane electrodes, as well as the battery stack pressing process, will cause a certain degree of leakage in the battery stack.

[0004] Generally, when the fuel cell stack is offline, the hydrogen cavity, air cavity and cooling cavity of the fuel cell stack will be tested for external and internal leakage. The external leakage position can be located by helium detection, and the internal leakage position between hydrogen and air can be judged by the performance of the single-chip voltage value. However, if internal leakage occurs in the cooling path, there is currently no clear detection method to identify the location of the leakage point, which will lead to a lack of specific direction when repairing the fuel cell stack, resulting in a large amount of waste of raw materials and increasing the cost of the fuel cell stack.

[0005] The existing patent 201210551821.5 - Internal leakage prevention cover of battery discloses that the leakage resistance of electrolyte can be improved, but does not clearly disclose the technical content for solving the above-mentioned technical problems.

[0006] Therefore, in order to improve or solve at least one of the above problems, a new auxiliary device is needed to assist in the internal leakage detection of the battery stack. Utility Model Content

[0007] The utility model aims to provide a blocking plate structure suitable for realizing an open circuit state of a cooling path during internal leakage detection of a fuel cell stack.

[0008] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0009] A blocking plate structure for detecting internal leakage in a cooling path of a fuel cell stack comprises a blocking plate body, wherein a reserved opening for the cooling path is provided on the blocking plate body;

[0010] The blocking plate body is provided with a fastening portion; the fastening portion includes a bolt hole provided on the blocking plate body.

[0011] The blocking plate body is also provided with an air path sealed cavity and a hydrogen path sealed cavity.

[0012] The blocking plate body includes a base plate and a raised plate, and the base plate and the raised plate have a T-shaped vertical cross-section.

[0013] The cooling path reserved opening, the air path sealed cavity and the hydrogen path sealed cavity ends are provided with connecting sealing rings.

[0014] A detection system for detecting the position of internal leakage in a fuel cell stack cooling path includes a test bench connected to a fuel cell stack to be tested; a piping mechanism of the test bench connected to the fuel cell stack to be tested, and the piping mechanism connected to the fuel cell stack to be tested via a blocking plate structure;

[0015] The battery stack to be tested is connected to a voltage acquisition system.

[0016] The voltage acquisition system includes a CVP plugged into the battery stack; each CVP is connected to a CVM via a wiring harness.

[0017] The pipeline structure includes an inlet pipeline and an outlet pipeline; the inlet pipeline is connected to the inlet of the cooling path of the test stack through a blocking plate structure; the outlet of the cooling path of the test stack is connected to the outlet pipeline through a blocking plate structure.

[0018] The advantages of the present invention are:

[0019] The utility model discloses a blocking plate structure for detecting internal leakage of a cooling path of a fuel cell stack and a detection system with the blocking plate structure.

[0020] The utility model facilitates the subsequent blocking of the air path and the hydrogen path of the fuel cell stack by setting the blocking plate structure, realizes the operation of separate gas supply to the cooling path, and further facilitates the subsequent detection operation.

[0021] At the same time, the detection system disclosed in the present invention can detect the voltage of a single-chip battery, thereby determining whether an internal leakage problem occurs in the cooling path of the corresponding single-chip battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The following is a brief description of the contents and marks in the drawings of the utility model specification:

[0023] Figure 1 This is a schematic structural diagram of the blocking plate structure in the utility model from the first perspective.

[0024] Figure 2 This is a schematic structural diagram of the blocking plate structure from the second perspective of the present invention.

[0025] Figure 3 It is a structural diagram of the detection system in this utility model.

[0026] The marks in the above figure are:

[0027] 1. Blocking plate structure, 2. Air path sealed cavity, 3. Cooling path reserved opening, 4. Hydrogen path sealed cavity, 5. Connection sealing ring, 6. Bolt hole, 7. Inlet pipeline, 8. Fuel cell stack, 9. CVP, 10. Wiring harness, 11. CVM, 12. Test bench. DETAILED DESCRIPTION

[0028] The following describes the preferred embodiment with reference to the accompanying drawings to further illustrate the specific implementation of the present invention.

[0029] A blocking plate structure 1 for detecting internal leakage in the cooling path of a fuel cell stack 8 comprises a blocking plate body 1-1, on which a reserved opening 3 for the cooling path is provided; a fastening portion is provided on the blocking plate body 1-1; the fastening portion comprises a bolt hole 6 provided on the blocking plate body 1-1; the utility model facilitates the subsequent blocking of the air path and the hydrogen path of the fuel cell stack 8 through the provision of the blocking plate structure 1, thereby realizing a separate gas supply operation for the cooling path; and thus facilitates subsequent detection operations.

[0030] The setting of the blocking plate structure 1 of the utility model plays an external connection role, which facilitates the connection between the subsequent inlet pipeline 7 and the outlet pipeline 71. Another function is to play a good sealing role, which is convenient for blocking the air path and the hydrogen path of the battery stack 8. During subsequent air intake, only the cooling path performs the air intake operation. Because the cooling path intakes air, if an internal leak is found somewhere later, the hydrogen entering the cooling path can escape to the hydrogen path or the air path through the internal leak position. Since there is a difference in the gas medium on both sides of the battery membrane electrode, an open circuit voltage will be established; in conjunction with the voltage acquisition system, internal leakage detection of the battery stack 8 can be realized.

[0031] Furthermore, in the utility model, an air path sealed cavity 2 and a hydrogen path sealed cavity 4 are also provided on the blocking plate body 1-1; based on such a setting, the air path sealed cavity 2 and the hydrogen path sealed cavity 4 are a countersunk structure, which facilitates the sealing of the hydrogen path and the air path, and facilitates the formation of a closed space between the hydrogen path and the air path.

[0032] Furthermore, in the present invention, the blocking plate body 1-1 includes a base plate 11 and a raised plate 12, and the vertical cross-sections of the base plate 11 and the raised plate 12 are T-shaped; in the present invention, the base plate 11 is a basic connecting plate, which is convenient for fitting and connecting to the end plate of the battery stack 8, and the raised plate 12 plays a good bridging role, facilitating the subsequent connection with the pipeline mechanism.

[0033] Furthermore, in the present invention, a connecting sealing ring 5 is provided at the end of the cooling path reserved opening 3, the air path closed cavity 2 and the hydrogen path closed cavity 4; the connecting sealing ring 5 is arranged at the end of the cooling path reserved opening 3, the air path closed cavity 2 and the hydrogen path closed cavity 4, and is subsequently squeezed and matched with the end plate to ensure the sealing at the joint between the blocking plate structure 1 and the end plate.

[0034] A detection system for detecting the position of internal leakage in the cooling path of a battery stack 8, comprising a test bench 12, wherein the test bench 12 is connected to the battery stack 8 to be tested; a pipeline mechanism of the test bench 12 is connected to the battery stack 8 to be tested, and the pipeline mechanism is connected to the battery stack 8 to be tested through the blocking plate structure 1; the battery stack 8 to be tested is connected to a voltage acquisition system; the voltage acquisition system comprises a CVP9 plugged into the battery stack 8; each of the CVP9s is connected to a CVM11 through a wiring harness 10; the pipeline mechanism comprises an inlet pipeline 7 and an outlet pipeline 71; the inlet pipeline 7 is connected to the inlet of the cooling path of the battery stack 8 to be tested through a blocking plate structure 1; the outlet of the cooling path of the battery stack 8 to be tested is connected to the outlet pipeline 71 through a blocking plate structure 1; the detection system disclosed in the present utility model can determine whether an internal leakage problem occurs in the cooling path of the corresponding single-chip battery by detecting the voltage of the single-chip battery.

[0035] The test bench 12 of the present invention is mainly used to apply hydrogen pulses to the battery stack 8 to be tested. During actual use, since the hydrogen path and the air path are in a closed state, only the cooling path is used for air intake. Subsequently, when an internal leakage occurs in a single-chip battery, the hydrogen in the cooling path will enter the hydrogen path and the air path. Since there is a difference in the gas medium on both sides of the battery membrane electrode, an open circuit voltage will be established. In conjunction with the voltage acquisition system, internal leakage detection of the battery stack 8 can be realized.

[0036] specific:

[0037] The blocking plate structure 1 disclosed in the present invention is installed on the end plate at the manifold of the fuel cell stack 8, connecting the hydrogen inlet pipeline 7 of the fuel cell test bench 12 to the inlet of the blocking plate structure 1, and connecting the hydrogen outlet pipeline 71 of the fuel cell test bench 12 to the outlet of the blocking plate structure 1.

[0038] A hydrogen pulse is applied to the fuel cell stack 8 through the fuel cell test bench 12. By judging whether the voltage signal of each single cell on the stack 8 changes, the battery position where the leakage occurs in the cooling path is locked. By judging whether the single voltage is positive or negative, it is determined whether the leakage in the cooling path is to the bipolar plate on the hydrogen side or the bipolar plate on the air side of the battery.

[0039] The device and method are easy to implement, low in cost, and have significant detection effects.

[0040] Before detecting the location of the internal leakage in the cooling path, first connect the manifold end plate of the stack 8 to the blocking plate structure 1 (two blocking plate structures 1 are required), and at the same time, a connecting sealing ring 5 is provided at the end of the reserved opening 3 of the cooling path, the air path sealed cavity 2, and the hydrogen path sealed cavity 4.

[0041] The cooling path is still in an unsealed state after the blocking plate structure 1 is installed. The blocking plate structure 1 is connected to the inlet and outlet pipes 71 of the hydrogen path of the test bench 12. Figure 3 shown.

[0042] A single-chip voltage acquisition device CVP9 (Ce ll voltage pickup) is inserted into the fuel cell stack 8. CVP9 transmits the signal to CVM11 (Ce ll voltage monitor) through the wiring harness 10. After receiving the signal, CVM11 feeds it back to the fuel cell test bench 12, displaying the voltage value signal of the single-chip voltage in real time.

[0043] Working methods and principles

[0044] As shown in the figure, before the test, a 10s hydrogen pulse is applied to the cooling path inlet of the fuel cell stack 8 through the fuel cell test bench, and the hydrogen flow rate is 20L / min.

[0045] Since only the cooling path is open in the blocking plate structure 1, the applied hydrogen pulse will flow only through the cooling path.

[0046] After applying the hydrogen pulse, the voltage signal of the single cell of the fuel cell stack 8 is monitored in real time (the signal collected by CVP9 on each two bipolar plates is transmitted to CVM11 through the wiring harness 10, and the fuel cell test bench 12 analyzes the collected signal and displays the voltage value of the single cell in real time).

[0047] If the voltage of a certain battery fluctuates (>2mV), it can be directly located that the battery has a leakage problem in the cooling circuit.

[0048] If the voltage value is positive, it can be determined that the leakage path of the cooling path in the battery cell is from the cooling path cavity in the hydrogen side bipolar plate to the hydrogen path cavity. If the voltage value is negative, it can be determined that the leakage path of the cooling path in the battery cell is from the cooling path cavity in the air side bipolar plate to the air path cavity.

[0049] Test principle: Under normal circumstances, the hydrogen path and the air path of the fuel cell stack 8 are both filled with air.

[0050] Once hydrogen enters the hydrogen path or the air path, an open circuit voltage will be established due to the difference in the gas medium on both sides of the battery membrane electrode.

[0051] Figure 3The CVP9 acquisition device shown has defined positive and negative poles, with the anode as the negative pole and the cathode as the positive pole. Once hydrogen from the cooling path enters the hydrogen path, the resulting open-circuit voltage is positive, because the hydrogen path is hydrogen, with a low potential, while the air path is air, with a high potential. If hydrogen from the cooling path enters the air path, the resulting open-circuit voltage is negative, because the hydrogen path is air, with a high potential, while the hydrogen in the air path has a low potential. This test method amplifies the internal leakage in the cooling path into a recognizable voltage signal, allowing the location of the cooling path leak to be directly identified by observing the voltage value.

[0052] Obviously, the specific implementation of the present invention is not limited to the above-mentioned methods. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention, they are all within the scope of protection of the present invention.

Claims

1. A blocking plate structure for detecting internal leakage in a stack cooling path, characterized in that: It includes a blocking plate body, and a reserved opening for a cooling path is provided on the blocking plate body; The blocking plate body is provided with a fastening portion; the fastening portion includes a bolt hole provided on the blocking plate body.

2. The blocking plate structure for detecting internal leakage in a fuel cell stack cooling path according to claim 1, characterized in that: The blocking plate body is also provided with an air path sealed cavity and a hydrogen path sealed cavity.

3. The blocking plate structure for detecting internal leakage in a stack cooling path according to claim 2, characterized in that: The blocking plate body includes a base plate and a raised plate, and the base plate and the raised plate have a T-shaped vertical cross-section.

4. The blocking plate structure for detecting internal leakage in a stack cooling path according to claim 2, characterized in that: The cooling path reserved opening, the air path sealed cavity and the hydrogen path sealed cavity ends are provided with connecting sealing rings.

5. A detection system for detecting the position of leakage in a stack cooling path, characterized in that: The test bench comprises a test bench connected to a battery stack to be tested; the test bench pipeline mechanism is connected to the battery stack to be tested, and the pipeline mechanism is connected to the battery stack to be tested via the blocking plate structure according to any one of claims 1 to 4; The battery stack to be tested is connected to a voltage acquisition system.

6. A detection system for detecting internal leakage in a fuel cell stack cooling path according to claim 5, characterized in that: The voltage acquisition system includes a CVP plugged into the battery stack; each CVP is connected to a CVM via a wiring harness.

7. The detection system for detecting the position of internal leakage in the cooling path of a fuel cell stack according to claim 5, characterized in that: The pipeline structure includes an inlet pipeline and an outlet pipeline; the inlet pipeline is connected to the inlet of the cooling path of the test stack through a blocking plate structure; the outlet of the cooling path of the test stack is connected to the outlet pipeline through a blocking plate structure.

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