Detection equipment and method for stack assembly

Abstract

The invention discloses a detection device and method for stack assembly, and relates to the technical field of fuel cells. The detection efficiency is improved. Comprising a base, an airtightness detection box body and a detection part for detecting the qualified rate of a galvanic pile main body, a base plate is fixed to the outer wall of the top of the airtightness detection box body, the side wall of the airtightness detection box body is connected with an airtightness detection tool, and a sliding rail mechanism is installed on the outer wall of the top of the airtightness detection box body; the output end of the sliding rail mechanism is movably connected with a first sliding piece and a second sliding piece, the first sliding piece and the second sliding piece are each movably connected with two second sliding blocks, and the bottoms of the two second sliding blocks located on the two sides are each movably connected with a swing arm. According to the invention, the problem of low one-time off-line qualification rate of galvanic pile assembly in the prior art is solved; the contact resistance of the membrane electrode can be effectively reduced through prepressing, the performance and reliability of the fuel cell stack are improved, meanwhile, the method is simple and effective, the stack production efficiency is high, the stack activation frequency is reduced, and the production cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel cells, and in particular to a detection device and method for assembling a fuel cell stack. Background Art

[0002] A fuel cell is a power generation device that directly converts the chemical energy in hydrogen and oxygen into electrical energy through electrochemical reactions. It has the advantages of high energy efficiency and fast response speed. A fuel cell stack is composed of membrane electrodes, bipolar plates, current collectors, end plates, fasteners, manifolds and other components. A high-power stack usually contains three to four hundred membrane electrodes and bipolar plates. After assembly off the line, it can only be shipped after passing the air tightness test, insulation test, activation test, polarization curve test and other tests.

[0003] During the production process, due to problems such as airtightness failure, hydrogen-air crosstalk, gas-water crosstalk, single low, and short circuit, the fuel cell needs to be repaired, the problematic parts replaced, and then pressed and tested again, resulting in a low first-time pass rate; the repair process is not only time-consuming and labor-intensive, and increases testing costs, but multiple disassembly and assembly can easily damage the membrane electrode and plate, which has an adverse effect on the durability of the stack and affects the factory quality of the fuel cell.

[0004] Therefore, how to improve the first-time qualified rate of battery stack assembly and reduce production costs has become a technical problem that needs to be urgently solved by technical personnel in this field. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a detection device and method for battery stack assembly.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A detection device for battery stack assembly, comprising a base, an airtight detection box and a detection unit for detecting the pass rate of a battery stack body, a pad is fixed to the top outer wall of the airtight detection box, an airtight detection tool is connected to the side wall of the airtight detection box, and a slide rail mechanism is installed on the top outer wall of the airtight detection box, a slide member 1 and a slide member 2 are movably connected to the output ends of the slide rail mechanism, two slide members 2 are movably connected to the slide member 1 and the slide member 2, two slide members 2 located on both sides are movably connected to swing arms at the bottom, the two swing arms are movably connected via a rotating shaft, and a roller for installing the battery stack body is fixed to the top of the swing arm.

[0008] Preferably: the slide rail mechanism includes a bidirectional threaded rod, a lining plate and a sliding rod, the sliding rod is fixed to the top outer wall of the airtight detection box, the lining plate is fixed to the top outer wall of the airtight detection box, the bidirectional threaded rod is movably connected between the two lining plates, and a driving motor is fixed to the outer wall on one side of one of the lining plates.

[0009] Further: the sliding member 1 includes a transverse rod and two sliders 3, the transverse rod and the two sliders 3 are fixedly connected, the two sliders 2 are movably connected to the transverse rod, one slider 3 is movably connected to the sliding rod, and the other slider 3 is threadedly connected to the bidirectional threaded rod.

[0010] Further: the sliding member 2 includes a bidirectional threaded rod 1 and two sliders 1, wherein one slider 1 is movably connected to the sliding rod, the other slider 1 is threadedly connected to the bidirectional threaded rod, the bidirectional threaded rod 1 is movably connected between the two sliders 1, and a driving motor 2 is fixed to the outer wall of one side of one slider 1.

[0011] As a preferred solution of the present invention: the battery stack body includes end plate 1, end plate 2 and a core, and the end plate 1, end plate 2 and multiple cores are installed in a stacked manner; a CVM and an industrial computer are placed on the outer wall of the top of the base, and the CVM and the industrial computer are electrically connected; a detection head is fixed on the side wall of the core, and the detection head and the CVM are electrically connected.

[0012] As a further solution of the present invention: a bracket is fixed to the top outer wall of the airtight detection box, a press is fixed to the top outer wall of the bracket, and a pressure head is fixed to the output end of the press through a pin.

[0013] As a further solution of the present invention: the airtight detection tooling includes an exhaust ball valve and an exhaust pipe, the exhaust pipe is connected to the side wall of the airtight detection box through a joint, the exhaust ball valve is fixed to one end of the exhaust pipe, the side wall of the airtight detection box is fixed with an intermediate tube through a joint, one end of the intermediate tube is fixed with an intake solenoid valve, the end of the intake solenoid valve away from the intermediate tube is connected to an air source solenoid valve through a multi-way tube, one end of the air source solenoid valve is connected to a pressure regulating valve through a pipeline, the two pressure regulating valves are respectively connected to a hydrogen gas source and a nitrogen gas source through a joint, the top of the airtight detection box is connected to a detection pipe through a joint, and the detection pipe is connected to the bottom of the second end plate through a joint.

[0014] On the basis of the above-mentioned scheme: a mounting plate is fixed to the top outer wall of the airtight detection box, a guide column is movably connected to the through hole on the surface of the mounting plate, a rejection mechanism is fixed to one end of the guide column and the outer wall of the transverse rod, the rejection mechanism includes a connecting seat, a movable seat and a sliding frame, the connecting seat and the movable seat are integrally formed, the sliding frame and the movable seat are movably connected, the driving plate is movably connected to the through hole on the surface of the sliding frame, the driving plate and the pressure head are fixedly connected, a hydraulic cylinder is fixed to the bottom outer wall of the sliding frame, and a clamping plate is fixed to the output end of the hydraulic cylinder by a pin.

[0015] On the basis of the above scheme: the roller member includes a limit plate and a roller wheel, the limit plate is welded to the top of the swing arm, and the roller wheel is movably connected between the inner walls on both sides of the limit plate.

[0016] A method for improving the qualified rate of battery stack assembly comprises the following steps:

[0017] S1, stacking the battery cells of the battery stack body in order, and after the battery stack body is assembled, applying pressure to the top of the battery stack body using a press and a press head to reach a preset assembly pressure F1 for pre-pressing;

[0018] S2. Each battery cell of the battery stack body is connected to the detection head, CVM and industrial computer, and a hydrogen-nitrogen mixture or hydrogen is introduced into the anode of the battery stack body to monitor the open-circuit voltage of the fuel cell stack, and the battery cells with obviously low voltage are marked to eliminate the battery cells with hydrogen-air mutual crossover or short circuit problems; nitrogen purge reduces the voltage to 0V, and a hydrogen-nitrogen mixture or hydrogen is introduced into the cooling chamber of the battery stack body to monitor the voltage of each cell of the battery stack body, and the battery cells with voltage are marked to eliminate the battery cells with gas-water mutual crossover problems;

[0019] S3, determine whether there is a marked problematic battery cell in step S2, if yes, replace the marked problematic battery cell and repeat steps S1-S2; if no, proceed to step S4;

[0020] S4. Apply the target assembly pressure F0, tighten the battery stack body and carry out activation test.

[0021] The beneficial effects of the present invention are:

[0022] 1. A detection device for battery stack assembly solves the problem of low qualified rate of battery stack assembly in the prior art; the membrane electrode can effectively reduce the contact resistance after pre-pressing, and improve the performance and reliability of the fuel cell stack. At the same time, the method is simple and effective, the battery stack production efficiency is high, and the number of activation times of the battery stack is reduced to reduce the production cost.

[0023] 2. A detection device for battery stack assembly, which can adjust the position of the roller in both the horizontal and vertical directions, so that when the battery stack body needs to be assembled, each group of battery cells can be accurately aligned.

[0024] 3. A detection device for battery stack assembly, which is provided with a hydraulic cylinder and a clamping plate so that when an unqualified battery cell needs to be removed, the battery cell above it can be lifted as a whole, so that the unqualified battery cell can be pulled out and replaced quickly.

[0025] 4. A detection device for battery stack assembly, which monitors the open-circuit voltage of the battery stack body by introducing a hydrogen-nitrogen mixture or hydrogen into the anode of the battery stack body through a detection head, so as to mark battery cells that are obviously low and eliminate battery cells with hydrogen-air crosstalk or short circuit problems.

[0026] 5. A detection device for battery stack assembly, which monitors the voltage of each battery stack body by introducing a hydrogen-nitrogen mixture or hydrogen into the cooling chamber, and uses a detection head to monitor the voltage of each battery stack body, and removes battery cells with gas-water crosstalk problems by marking the battery cells with voltage. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of a detection device for battery stack assembly proposed by the present invention;

[0028] Figure 2 It is a schematic diagram of the side structure of a detection device for battery stack assembly proposed by the present invention;

[0029] Figure 3 It is a schematic diagram of the installation structure of a battery stack main body of a detection device for battery stack assembly proposed by the present invention;

[0030] Figure 4 It is a schematic diagram of the explosion structure of the device body of a detection device for battery stack assembly proposed by the present invention;

[0031] Figure 5 It is a schematic diagram of the installation structure of the positioning part of a detection device for battery stack assembly proposed by the present invention;

[0032] Figure 6 It is a schematic diagram of the main structure of the positioning part of a detection device for battery stack assembly proposed by the present invention;

[0033] Figure 7 It is a partial structural schematic diagram of a positioning part of a detection device for battery stack assembly proposed by the present invention;

[0034] Figure 8 It is a flow chart of a method for improving the qualified rate of battery stack assembly proposed by the present invention.

[0035] In the figure: base 1; airtight detection box 2; limit plate 3; end plate 1 4; press machine 5; bracket 6; hydrogen gas source 7; nitrogen gas source 8; pressure regulating valve 9; gas source solenoid valve 10; two-way threaded rod 11; drive motor 1 12; end plate 2 13; core 14; pad 15; detection head 16; CVM 17; industrial computer 18; pressure head 19; exhaust ball valve 20; exhaust pipe 21; detection pipe 22; connecting seat 23; mounting plate 24; guide column 25; multi-way pipe 26; intake solenoid valve 27; intermediate pipe 28; roller 29; two-way threaded rod 1 30; drive motor 2 31; slider 1 32; slider 2 33; transverse rod 34; slider 3 35; swing arm 36; moving seat 37; drive plate 38; clamping plate 39; hydraulic cylinder 40; sliding frame 41; lining plate 42; sliding rod 43. DETAILED DESCRIPTION

[0036] The technical solution of this patent is further described in detail below in conjunction with specific implementation methods.

[0037] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0038] Embodiment 1:

[0039] A detection device for battery stack assembly, such as Figures 1 to 7 As shown, it includes a base 1, an airtight detection box 2 and a detection part for detecting the qualified rate of the battery stack body, the top outer wall of the airtight detection box 2 is fixed with a pad 15, the side wall of the airtight detection box 2 is connected with an airtight detection tooling, and the top outer wall of the airtight detection box 2 is installed with a slide rail mechanism, the output ends of the slide rail mechanism are movably connected with a slide member 1 and a slide member 2 respectively, the slide member 1 and the slide member 2 are movably connected with two sliders 2 33, the bottoms of the two sliders 2 33 located on both sides are movably connected with swing arms 36, the two swing arms 36 are movably connected through a rotating shaft, and the top of the swing arm 36 is fixed with a roller for installing the battery stack body;

[0040] When it is necessary to test the qualified rate of the battery stack body, the battery stack body is assembled first. During the assembly, the battery cells of the battery stack body, specifically including membrane electrodes and bipolar plates, are stacked in sequence on the pad 15 by stacking. In order to ensure that the battery cells can be quickly and accurately aligned, the slide member 1 and the slide member 2 are relatively moved along the slide rail mechanism. At the same time, the position of the slider 2 33 on the slide member 1 and the slide member 2 is kept unchanged during this process. With the relative movement between the slide member 1 and the slide member 2, the straight-line distance between the roller members on the two rotatably connected swing arms 36 is adjusted to make them adapt to battery stack bodies of different widths. After the width is adapted, the two sliders 2 33 on the slide member 1 and the two sliders 33 on the slide member 2 are moved in opposite directions, so that the roller members are adapted to battery stack bodies of different lengths. After the spacing between the four roller members is adjusted, the roller members are used to position the installation of the battery cells of the battery stack body to ensure precise fit between the battery cells.

[0041] Furthermore, the slide rail mechanism includes a bidirectional threaded rod 11, a lining plate 42 and a slide rod 43, the slide rod 43 is fixed to the top outer wall of the airtight detection box 2 by bolts, the lining plate 42 is fixed to the top outer wall of the airtight detection box 2 by bolts, the bidirectional threaded rod 11 is rotatably connected between the two lining plates 42, one of the outer walls of one side of the lining plate 42 is fixed with a drive motor 12 by bolts, the output end of the drive motor 12 and the bidirectional threaded rod 11 are connected by a coupling, the sliding member 1 includes a transverse rod 34 and a slider 3 35, the transverse rod 34 and the slider 3 35 are fixedly connected, and the two sliders 2 33 and the transverse rod 34 are slidably connected, one of the sliders 35 and the slide bar 43 is slidably connected, and the other slider 35 and the bidirectional threaded rod 11 are threadedly connected, the sliding member 2 includes a bidirectional threaded rod 1 30 and a slider 1 32, one of the sliders 1 32 is slidably connected to the slide bar 43, and the other slider 1 32 is threadedly connected to the bidirectional threaded rod 11, the bidirectional threaded rod 1 30 is rotatably connected between the two sliders 1 32, and a driving motor 2 31 is fixed to the outer wall of one side of one slider 1 32 by bolts, and the output end of the driving motor 2 31 is connected to one end of the bidirectional threaded rod 1 30 through a coupling;

[0042] When the driving motor 12 drives the bidirectional threaded rod 11 to rotate, the bidirectional threaded rod 11 is provided with positive and negative threads so that the slider three 35 and the slider one 32 move in opposite directions. When the driving motor 2 31 drives the bidirectional threaded rod 30 to rotate, the bidirectional threaded rod 30 is provided with positive and negative threads so that the two sliders two 33 on the transverse rod 34 move in opposite directions. Through this adjustment method, the roller can position the battery stack bodies of different specifications.

[0043] Furthermore, the roller member includes a limit plate 3 and a roller 29, the limit plate 3 is welded to the top of the swing arm 36, and the roller 29 is rotatably connected between the inner walls on both sides of the limit plate 3;

[0044] By rotatably connecting the roller 29 and the limiting plate 3, the wear of the battery cells during the stacking process is reduced.

[0045] Furthermore, the battery stack body includes an end plate 1 4 , an end plate 2 13 and a core 14 , and the end plate 1 4 , the end plate 2 13 and a plurality of cores 14 are installed in a stacking manner.

[0046] Furthermore, a bracket 6 is fixed to the top outer wall of the airtight detection box 2 by bolts, a press 5 is fixed to the top outer wall of the bracket 6 by bolts, and a pressure head 19 is fixed to the output end of the press 5 by a pin;

[0047] In order to ensure the sealing between the multiple cores 14 after stacking, when the stack body is stacked and installed, the press 5 is used to drive the pressure head 19 downward to apply pressure to the top of the end plate 4 to ensure the sealing effect between the multiple cores 14 after stacking.

[0048] The top outer wall of the base 1 is provided with a CVM 17 and an industrial computer 18, which are electrically connected to each other. The side wall of the core 14 is fixed with a detection head 16, which is electrically connected to the CVM 17.

[0049] The airtight detection tooling includes an exhaust ball valve 20 and an exhaust pipe 21, the exhaust pipe 21 is connected to the side wall of the airtight detection box 2 through a joint, the exhaust ball valve 20 is fixed to one end of the exhaust pipe 21 by bolts, the side wall of the airtight detection box 2 is fixed with an intermediate pipe 28 through a joint, one end of the intermediate pipe 28 is fixed with an intake solenoid valve 27 by bolts, the end of the intake solenoid valve 27 away from the intermediate pipe 28 is connected to the air source solenoid valve 10 through a multi-way pipe 26, one end of the air source solenoid valve 10 is connected to a pressure regulating valve 9 through a pipeline, and the two pressure regulating valves 9 are respectively connected to a hydrogen gas source 7 and a nitrogen gas source 8 through joints, the top of the airtight detection box 2 is connected to a detection pipe 22 through a joint, and the detection pipe 22 is connected to the bottom of the end plate 2 13 through a joint;

[0050] When it is necessary to test the qualified rate of the battery stack body, after connecting the detection pipeline 22 and the battery stack body, use the press 5 and the pressure head 19 to apply pressure to the battery stack body, then introduce hydrogen-nitrogen mixture or hydrogen into the anode of the battery stack body, use the detection head 16 to monitor the open-circuit voltage of the battery stack body, mark the battery cells that are obviously too low, and use it to eliminate the battery cells with hydrogen-air crosstalk or short circuit problems, then use nitrogen to purge the voltage to 0V, then introduce hydrogen-nitrogen mixture or hydrogen into the cooling chamber, and the detection head 16 monitors the voltage of each cell of the battery stack body, marks the battery cells with voltage, and uses it to eliminate the battery cells with gas-water crosstalk problems.

[0051] The top outer wall of the airtight detection box 2 is fixed with a mounting plate 24 by bolts, and a guide column 25 is slidably connected to a through hole on the surface of the mounting plate 24, and a rejection mechanism is fixed to one end of the guide column 25 and the outer wall of the transverse rod 34, and the rejection mechanism includes a connecting seat 23, a moving seat 37 and a sliding frame 41, and the connecting seat 23 and the moving seat 37 are integrally formed, and the sliding frame 41 and the moving seat 37 are slidably connected. A driving plate 38 is slidably connected to the through hole on the surface of the sliding frame 41, and the driving plate 38 and the pressure head 19 are fixedly connected, and a hydraulic cylinder 40 is fixed to the outer wall of the bottom of the sliding frame 41 by bolts, and a clamping plate 39 is fixed to the output end of the hydraulic cylinder 40 by a pin;

[0052] After the detection, when one of the battery cells is abnormal and needs to be removed and replaced, the driving motor 12 is used to drive the bidirectional threaded rod 11 to rotate so that the two movable seats 37 move in relative directions, so that the straight-line distance between the two clamps 39 gradually decreases. In this process, the hydraulic cylinder 40 is used to drive the clamp 39 to move up and down, so that the clamp 39 and the battery cell side wall at the top of the battery cell that needs to be removed are in a facing position. When the clamp 39 moves to fit the side wall, it is clamped and fixed. Then the press 5 is used to drive the pressure head 19 to move upward, and the hydraulic cylinder 40 is used to drive the clamp 39 to move upward, so that the battery cell above the battery cell that needs to be removed is suspended in the air, which is convenient for pulling out the battery cell that needs to be removed for replacement.

[0053] Embodiment 2:

[0054] A method for improving the qualified rate of battery stack assembly comprises the following steps:

[0055] S1, stacking the battery cells of the battery stack body in order, and after the battery stack body is assembled, applying pressure to the top of the battery stack body by using the press 5 and the press head 19 to reach the preset assembly pressure F1 for pre-pressing;

[0056] S2. Each battery cell of the battery stack body is connected to the detection head 16, CVM17 and industrial computer 18, and a hydrogen-nitrogen mixture or hydrogen is introduced into the anode of the battery stack body to monitor the open-circuit voltage of the fuel cell stack, and the battery cells with obviously low voltage are marked to eliminate the battery cells with hydrogen-air mutual crosstalk or short circuit problems; nitrogen purge reduces the voltage to 0V, and a hydrogen-nitrogen mixture or hydrogen is introduced into the cooling chamber of the battery stack body to monitor the voltage of each cell of the battery stack body, and the battery cells with voltage are marked to eliminate the battery cells with gas-water mutual crosstalk problems;

[0057] S3, determine whether there is a marked problematic battery cell in step S2, if yes, replace the marked problematic battery cell and repeat steps S1-S2; if no, proceed to step S4;

[0058] S4, applying the target assembly pressure F0, and fastening the battery stack body offline for activation test;

[0059] The preset assembly pressure F1 in step S1 is 0.8-0.99 times, preferably 0.9 times, the target assembly pressure F0 in step S4;

[0060] The preset assembly pressure F1 holding time is 3-15 minutes; the target assembly pressure F0 holding time is 3-10 minutes;

[0061] Preferably, the gas pressure of the hydrogen-nitrogen mixed gas or hydrogen introduced into the anode of the stack body does not exceed 50 kPa;

[0062] Preferably, the gas pressure range of the hydrogen-nitrogen mixed gas or hydrogen introduced into the cooling chamber of the fuel cell stack body is 50-100 kPa.

[0063] The above is a preferred specific implementation manner of the present invention, and the protection scope of the present invention is not limited thereto. Any modification, equivalent substitution and improvement made by any technician familiar with the field within the technical scope disclosed by the present invention in combination with the prior art or public common sense, within the spirit and principle of the present invention, shall be covered by the protection scope of the present invention.

Claims

1. A testing device for battery stack assembly, comprising a base (1), an airtight testing box (2) and a testing unit for testing the pass rate of the battery stack body, characterized in that: A pad (15) is fixed to the top outer wall of the airtight detection box (2), the side wall of the airtight detection box (2) is connected to an airtight detection tooling, and a slide rail mechanism is installed on the top outer wall of the airtight detection box (2), and the output ends of the slide rail mechanism are respectively movably connected to a slide member 1 and a slide member 2, and the slide member 1 and the slide member 2 are both movably connected to two sliders 2 (33), and the bottoms of the two sliders 2 (33) located on both sides are movably connected to swing arms (36), and the two swing arms (36) are movably connected via a rotating shaft, and a roller for installing the battery stack body is fixed to the top of the swing arm (36).

2. A detection device for battery stack assembly according to claim 1, characterized in that: The slide rail mechanism comprises a bidirectional threaded rod (11), a lining plate (42) and a slide rod (43); the slide rod (43) is fixed to the top outer wall of the airtight detection box (2); the lining plate (42) is fixed to the top outer wall of the airtight detection box (2); the bidirectional threaded rod (11) is movably connected between the two lining plates (42); a driving motor (12) is fixed to the outer wall of one side of one of the lining plates (42).

3. The detection device for battery stack assembly according to claim 2, characterized in that: The sliding member 1 comprises a transverse rod (34) and two sliding blocks 3 (35), wherein the transverse rod (34) and the two sliding blocks 3 (35) are fixedly connected, wherein the two sliding blocks 2 (33) and the transverse rod (34) are movably connected, wherein one sliding block 3 (35) and the sliding rod (43) are movably connected, and the other sliding block 3 (35) and the bidirectional threaded rod (11) are threadedly connected.

4. The detection device for battery stack assembly according to claim 3, characterized in that: The sliding member 2 comprises a bidirectional threaded rod 1 (30) and two sliding blocks 1 (32), wherein one sliding block 1 (32) is movably connected to the sliding rod (43), and the other sliding block 1 (32) is threadedly connected to the bidirectional threaded rod (11), the bidirectional threaded rod 1 (30) is movably connected between the two sliding blocks 1 (32), and a driving motor 2 (31) is fixed to an outer wall of one side of one sliding block 1 (32).

5. The detection device for battery stack assembly according to claim 4, characterized in that: The battery stack body comprises an end plate 1 (4), an end plate 2 (13) and a core (14); the end plate 1 (4), the end plate 2 (13) and a plurality of cores (14) are installed in a stacking manner; a CVM (17) and an industrial computer (18) are placed on the top outer wall of the base (1); the CVM (17) and the industrial computer (18) are electrically connected; a detection head (16) is fixed on the side wall of the core (14); the detection head (16) and the CVM (17) are electrically connected.

6. The detection device for battery stack assembly according to claim 5, characterized in that: A bracket (6) is fixed to the top outer wall of the airtight detection box (2), a press (5) is fixed to the top outer wall of the bracket (6), and a pressure head (19) is fixed to the output end of the press (5) via a pin.

7. The detection device for battery stack assembly according to claim 6, characterized in that: The airtightness detection tooling comprises an exhaust ball valve (20) and an exhaust pipe (21), wherein the exhaust pipe (21) is connected to the side wall of the airtightness detection box (2) through a joint, and the exhaust ball valve (20) is fixed to one end of the exhaust pipe (21). An intermediate pipe (28) is fixed to the side wall of the airtightness detection box (2) through a joint, and an intake solenoid valve (27) is fixed to one end of the intermediate pipe (28). The end of the intake solenoid valve (27) away from the intermediate pipe (28) is connected to the gas source solenoid valve (10) through a multi-way pipe (26), and one end of the gas source solenoid valve (10) is connected to a pressure regulating valve (9) through a pipeline. The two pressure regulating valves (9) are respectively connected to a hydrogen gas source (7) and a nitrogen gas source (8) through joints. The top of the airtightness detection box (2) is connected to a detection pipe (22) through a joint, and the detection pipe (22) is connected to the bottom of the second end plate (13) through a joint.

8. The detection device for battery stack assembly according to claim 7, characterized in that: A mounting plate (24) is fixed to the top outer wall of the airtight detection box (2), a through hole provided on the surface of the mounting plate (24) is movably connected to a guide column (25), one end of the guide column (25) and the outer wall of the transverse rod (34) are fixed with a rejection mechanism, the rejection mechanism comprises a connecting seat (23), a movable seat (37) and a sliding frame (41), the connecting seat (23) and the movable seat (37) are integrally formed, the sliding frame (41) and the movable seat (37) are movably connected, a through hole provided on the surface of the sliding frame (41) is movably connected to a driving plate (38), the driving plate (38) and the pressure head (19) are fixedly connected, a hydraulic cylinder (40) is fixed to the bottom outer wall of the sliding frame (41), and a clamping plate (39) is fixed to the output end of the hydraulic cylinder (40) through a pin.

9. The detection device for battery stack assembly according to claim 8, characterized in that: The roller component comprises a limit plate (3) and a roller (29); the limit plate (3) is welded to the top of the swing arm (36); and the roller (29) is movably connected between the inner walls on both sides of the limit plate (3).

10. A detection method for battery stack assembly, using the detection device for battery stack assembly according to any one of claims 1 to 9, characterized in that: The steps include: S1, stacking the battery cells of the battery stack body in order, and after the battery stack body is assembled, applying pressure to the top of the battery stack body using a press (5) and a press head (19) to reach a preset assembly pressure F1 for pre-pressing; S2, each battery cell of the battery stack body is connected to the detection head (16), CVM (17) and industrial control computer (18), hydrogen-nitrogen mixed gas or hydrogen is introduced into the anode of the battery stack body, the open circuit voltage of the fuel cell stack is monitored, and the battery cells with obviously low voltage are marked to eliminate the battery cells with hydrogen-air mutual crossover or short circuit problems; nitrogen purge is used to reduce the voltage to 0V, hydrogen-nitrogen mixed gas or hydrogen is introduced into the cooling chamber of the battery stack body, the voltage of each cell of the battery stack body is monitored, and the battery cells with voltage are marked to eliminate the battery cells with gas-water mutual crossover problems; S3, determine whether there is a marked problematic battery cell in step S2, if yes, replace the marked problematic battery cell and repeat steps S1-S2; if no, proceed to step S4; S4. Apply the target assembly pressure F0, tighten the battery stack body and carry out activation test.

Images