Multi-cell detection equipment

Abstract

The utility model relates to the technical field of battery cell manufacturing, in particular to multi-battery cell detection equipment. The multi-cell detection equipment comprises a rack, a mounting plate arranged in the middle of the rack, a rotating table rotationally arranged on the mounting plate, two multi-cell placement boxes arranged on the rotating table, a lifting frame assembly arranged on the mounting plate, and a plurality of vacuum detection assemblies arranged at the movable end of the lifting frame assembly, the plurality of insulation test assemblies are arranged at the movable end of the lifting frame assembly, and the driving motor is arranged on the mounting plate. An output shaft of the driving motor is in transmission connection with the rotating table. According to the multi-cell detection device provided by the utility model, a plurality of groups of vacuum detection assemblies and insulation test assemblies are simultaneously arranged on the lifting frame assembly, so that the multi-cell detection device provided by the utility model can simultaneously complete air tightness and insulation tests of at least ten cells within the time of completing air tightness detection of a traditional single cell, and the efficiency is at least improved by 10 times.

Description

A multi-cell testing device Technical Field

[0001] This utility model relates to the field of battery cell manufacturing technology, and more specifically, it relates to a multi-cell testing device. Background Technology

[0002] To ensure the safety of electric vehicles and energy storage systems, airtightness and insulation tests must be performed on the battery cells (such as lithium iron phosphate cells and ternary lithium cells) during the manufacturing process.

[0003] Existing equipment for airtightness and insulation testing of battery cells is independent, and can only perform airtightness testing or insulation testing on battery cells. It cannot perform airtightness and insulation testing on multiple battery cells simultaneously, resulting in low testing efficiency and wasted production resources. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a multi-cell testing device to solve the technical problem that the existing testing devices cannot simultaneously perform airtightness and insulation testing on multiple cells, resulting in low testing efficiency.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0006] A multi-cell testing device includes a frame, a mounting plate disposed in the middle of the frame, a rotary table rotatably mounted on the mounting plate, two multi-cell placement boxes disposed on the rotary table, a lifting frame assembly disposed on the mounting plate, a plurality of vacuum testing components disposed at the movable end of the lifting frame assembly for moving and pressing against the liquid injection holes of the cells to perform airtightness testing, a plurality of insulation testing components disposed at the movable end of the lifting frame assembly for moving and pressing against the positive and negative terminals of the cells to perform insulation testing, and a drive motor disposed on the mounting plate for driving the rotary table to rotate; the output shaft of the drive motor is connected to the rotary table for transmission; the number of the plurality of vacuum testing components and the number of the plurality of insulation testing components correspond one-to-one with the number of cells on the multi-cell placement boxes.

[0007] Optionally, the bottom of the frame is equipped with a vacuum pump, a buffer tank, several suction solenoid valves corresponding to the vacuum detection components, and several charging solenoid valves corresponding to the vacuum detection components and used for breaking the vacuum; one port of the suction solenoid valve is connected to the buffer tank, and the other port is connected to the corresponding vacuum detection component; any port of the charging solenoid valve is connected to the corresponding vacuum detection component; the suction port of the vacuum pump is connected to the buffer tank.

[0008] Optionally, both the inflation solenoid valve and the deflation solenoid valve are two-position two-way solenoid valves.

[0009] Optionally, the vacuum testing assembly includes a vacuum probe, a nozzle disposed at the lower end of the vacuum probe and used to movably press against the battery cell injection hole for airtightness testing, a first sliding sleeve slidably sleeved and locked onto the vacuum probe, and a first spring sleeved on the vacuum probe; the first sliding sleeve is fixedly connected to the movable end of the lifting frame assembly; one end of the first spring presses against the vacuum probe, and the other end presses against the movable end of the lifting frame assembly; the lower end of the vacuum probe is connected to the nozzle, and its upper end is connected to another interface of the vacuum solenoid valve and any interface of the inflation solenoid valve.

[0010] Optionally, a silencer filter is installed on the interface of the inflation solenoid valve that is not connected to the vacuum probe.

[0011] Optionally, it also includes an insulation tester mounted on the rack or the lifting frame assembly, the insulation tester being electrically connected to the insulation test assembly.

[0012] Optionally, the insulation testing assembly includes two test probe assemblies; one test probe assembly is connected to one test pen of the insulation tester, and the other test probe assembly is connected to another test pen of the insulation tester; the test probe assembly includes a test probe for moving and pressing against the cell terminal to perform insulation testing, a second sliding sleeve that is slidably sleeved and locked onto the test probe, and a second spring sleeved on the test probe; the second sliding sleeve is fixedly connected to the movable end of the lifting frame assembly; one end of the second spring presses against the test probe, and the other end presses against the movable end of the lifting frame assembly; the upper end of the test probe is connected to the corresponding test pen of the insulation tester, and its lower end moves and presses against the positive or negative terminal of the cell.

[0013] Optionally, the lifting frame assembly includes four columns mounted on a mounting plate, a fixed plate mounted on the four columns, a lifting plate slidably mounted on the four columns, and a lifting cylinder mounted on the fixed plate for driving the lifting plate to slide; the piston rod of the lifting cylinder is fixedly connected to the lifting plate; the lifting plate is provided with a bakelite board for insulation, and the bakelite board is fixedly connected to the first sliding sleeve and the second sliding sleeve respectively; the first spring and the second spring both abut against the bakelite board.

[0014] In summary, the present invention has the following beneficial effects: by simultaneously setting multiple sets of vacuum testing components and insulation testing components on the lifting frame assembly, the multi-cell testing equipment provided by the present invention can simultaneously complete the airtightness and insulation tests of at least 10 cells in the time required for a traditional single cell to complete the airtightness test, thereby improving efficiency by at least 10 times. Attached Figure Description

[0015] Figure 1 is a structural schematic diagram of this utility model;

[0016] Figure 2 is a partial structural schematic diagram of this utility model;

[0017] Figure 3 is the front view of Figure 3;

[0018] Figure 4 is a partial structural diagram of Figure 2;

[0019] Figure 5 is a side view of Figure 4;

[0020] Figure 6 is an exploded view of the vacuum detection component and the insulation detection component of this utility model;

[0021] Figure 7 is a partial gas path diagram of the air tightness detection in this utility model;

[0022] Figure 8 is a partial circuit diagram of the insulation test in this utility model. Detailed Implementation

[0023] To make the objectives, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model are described in detail below with reference to the accompanying drawings. Several embodiments of this utility model are shown in the drawings. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein.

[0024] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0025] In this invention, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" of the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature. The terms "vertical," "horizontal," "left," "right," "above," "below," and similar expressions are for illustrative purposes only and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed or operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0026] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0027] This utility model provides a multi-cell testing device, as shown in Figures 1-6, including a frame 1, a mounting plate 11 disposed in the middle of the frame 1, a rotary table 2 rotatably disposed on the mounting plate 11, two multi-cell placement boxes 3 disposed on the rotary table 2, a lifting frame assembly 4 disposed on the mounting plate 11, a plurality of vacuum testing components 5 disposed at the movable end of the lifting frame assembly 4 for moving and pressing against the liquid injection hole of the cell to perform airtightness testing, a plurality of insulation testing components 6 disposed at the movable end of the lifting frame assembly 4 for moving and pressing against the positive and negative terminals of the cell to perform insulation testing, and a drive motor 7 disposed on the mounting plate 11 for driving the rotary table 2 to rotate; the output shaft of the drive motor 7 is connected to the rotary table 2 for transmission; the number of the plurality of vacuum testing components 5 and the number of the plurality of insulation testing components 6 correspond one-to-one with the number of cells on the multi-cell placement box 3.

[0028] Specifically, the mounting plate 11 is fixedly mounted in the middle of the frame 1 with screws, and the rotary table 2 is mounted on the upper surface of the mounting plate 11 via a load-bearing bearing; the drive motor 7 is a stepper motor, and its fixed end is fixedly mounted on the lower surface of the mounting plate 11 with screws, and its output shaft is fixedly connected to the geometric center of the rotary table 2. Two rectangular limiting slots (i.e., dual-station turntables) are symmetrically opened on the rotary table 2, and two multi-cell placement boxes 3 are placed in the corresponding rectangular limiting slots; the multi-cell placement boxes 3 have ten cell slots for holding cells from left to right. The lifting frame assembly 4 is fixedly mounted on the upper surface of the mounting plate 11 with screws, and its movable end (lifting end) is located above the multi-cell placement box 3. Ten vacuum detection components 5 and ten insulation test components 6 are fixedly mounted on the movable end of the lifting frame assembly 4 with screws. During descent, the vacuum detection components 5 press against the electrolyte injection holes of the cells to perform airtightness testing, and the insulation test components 6 press against the positive and negative terminals of the cells to perform insulation testing. The number and position of the vacuum detection components 5 and the ten insulation test components 6 correspond one-to-one with the number and position of the cells. A human-machine interface display screen (not shown in the attached diagram), ten airtightness indicator lights 12, and ten insulation indicator lights 13 are installed at the top of the frame 1. When the airtightness of the corresponding cell is qualified, the airtightness indicator light 12 displays green; when the airtightness of the corresponding cell is unqualified, the airtightness indicator light 12 displays red. When the insulation of the corresponding cell is qualified, the insulation indicator light 13 displays green; when the insulation of the corresponding cell is unqualified, the insulation indicator light 13 displays red.

[0029] The above-mentioned structure of this utility model, by simultaneously setting ten sets of vacuum testing components 5 and insulation testing components 6 on the lifting frame assembly 4, enables the multi-cell testing equipment provided by this utility model to simultaneously complete the airtightness and insulation tests of at least 10 cells in the time it takes for a traditional single cell to complete the airtightness test, thus improving efficiency by at least 10 times.

[0030] Furthermore, the bottom of the frame 1 is equipped with a vacuum pump 14, a buffer tank 15, several suction solenoid valves 16 corresponding to the vacuum detection components 5, and several charging solenoid valves 17 corresponding to the vacuum detection components 5 and used for breaking the vacuum; one port of the suction solenoid valve 16 is connected to the buffer tank 15, and the other port is connected to the corresponding vacuum detection component 5; any port of the charging solenoid valve 17 is connected to the corresponding vacuum detection component 5; the suction port of the vacuum pump 14 is connected to the buffer tank 15.

[0031] Furthermore, both the inflation solenoid valve 17 and the deflation solenoid valve 16 are one-way two-position two-way solenoid valves. A one-way two-position two-way solenoid valve refers to a solenoid valve with a check function and two fluid interfaces. It can be understood as a solenoid valve composed of a conventional two-position two-way solenoid valve and a one-way valve.

[0032] As shown in Figures 1 and 7, a vacuum pump 14, a buffer tank 15, ten suction solenoid valves 16, ten charging solenoid valves 17, and a PLC controller (not shown in the figures) are installed in the space at the bottom of the frame 1. The vacuum pump 14, suction solenoid valves 16, charging solenoid valves 17, airtightness indicator light 12, insulation indicator light 13, drive motor 7, and lifting frame assembly 4 are all electrically connected to the PLC controller. The suction port of the vacuum pump 14 is connected to the buffer tank 15 via a conduit. The buffer tank 15 is connected to the left end interface of the corresponding suction solenoid valve 16 via ten conduits. The right end interface of the suction solenoid valve 16 is connected to the vacuum detection assembly 5 via a conduit. The right end interface of the charging solenoid valve 17 is connected to the vacuum detection assembly 5 via a conduit. Each of the ten suction solenoid valves 16 and ten charging solenoid valves 17 is independently controlled by the PLC controller. Traditional airtightness testing mainly focuses on single-station, single-cell testing. One of the innovations of this invention is the addition of a buffer tank 15, which ensures that when 10 cells are vacuumed simultaneously, the amount of gas extracted will not be too large, thus extending the testing time. In other words, the equipment provided by this invention can complete the airtightness testing of 10 cells in the time it takes for a traditional single cell to complete the airtightness test, improving efficiency by 10 times.

[0033] Furthermore, the vacuum detection assembly 5 includes a vacuum probe 51, a suction nozzle 52 disposed at the lower end of the vacuum probe 51 and used to movably press against the battery cell injection hole for airtightness detection, a first sliding sleeve 53 slidably sleeved and locked onto the vacuum probe 51, and a first spring 54 sleeved on the vacuum probe 51; the first sliding sleeve 53 is fixedly connected to the movable end of the lifting frame assembly 4; one end of the first spring 54 presses against the vacuum probe 51, and the other end presses against the movable end of the lifting frame assembly 4; the lower end of the vacuum probe 51 is connected to the suction nozzle 52, and its upper end is connected to another interface of the suction solenoid valve 16 and any interface of the inflation solenoid valve 17 respectively.

[0034] As shown in Figures 1-7, the first sliding sleeve 53 is fixedly mounted on the movable end of the lifting frame assembly 4 with screws. It is a linear bearing sleeve, which effectively reduces friction between the sleeve and the vacuum probe 51. The upper end of the vacuum probe 51 passes through the first spring 54 and the first sliding sleeve 53 sequentially from bottom to top, and is then held in place by the first snap-fit ​​connector 55, allowing it to slide up and down within the first sliding sleeve 53 without falling off. The lower end of the first spring 54 abuts against the lower protrusion of the vacuum probe 51, and its upper end abuts against the movable end of the lifting frame assembly 4, driving the vacuum probe 51 to slide downwards. The upper end of the vacuum probe 51 is connected to the right end interface of the vacuum solenoid valve 16 via a conduit, and is sealed and inserted into a suction nozzle 52 made of silicone material. The suction nozzle 52 effectively ensures the seal between the nozzle and the battery cell injection hole, reducing misjudgments or incorrect assessments during airtightness testing. This invention extracts gas into the battery cell through the electrolyte injection hole and monitors the internal pressure change to determine the battery cell's sealing performance. If the battery cell has good sealing performance, the internal pressure change will be small. If the battery cell leaks, the internal pressure will change rapidly. By comparing the pressure difference between the initial and final pressure, the device can determine whether the battery cell's airtightness meets the standard.

[0035] Furthermore, as shown in Figure 7, in order to reduce the noise generated by the vacuum breaking after the airtightness test is completed, and to prevent foreign objects from entering the cell through the inflation solenoid valve 17, a silencer filter (not shown in the figure) is installed on the interface of the inflation solenoid valve 17 that is not connected to the vacuum probe 51 (another interface of the inflation solenoid valve 17).

[0036] Furthermore, it also includes an insulation tester (not shown in the attached figure) mounted on the frame 1 or the lifting frame assembly 4, the insulation tester being electrically connected to the insulation test assembly 6.

[0037] Furthermore, the insulation test assembly 6 includes two test probe assemblies 61; one test probe assembly 61 is connected to one test pen of the insulation tester, and the other test probe assembly 61 is connected to another test pen of the insulation tester; the test probe assembly 61 includes a test probe 611 for moving and pressing against the cell terminal to perform insulation testing, a second sliding sleeve 612 slidably sleeved and locked onto the test probe 611, and a second spring 613 sleeved on the test probe 611; the second sliding sleeve 612 is fixedly connected to the movable end of the lifting frame assembly 4; one end of the second spring 613 presses against the test probe 611, and the other end presses against the movable end of the lifting frame assembly 4; the upper end of the test probe 611 is connected to the corresponding test pen of the insulation tester, and its lower end moves and presses against the positive or negative terminal of the cell.

[0038] As shown in Figures 1-8, the insulation tester is a conventional short-circuit tester with positive and negative test leads, which can be installed on the frame 1 or the lifting frame assembly 4 as needed. The insulation test assembly 6 includes two test probe assemblies 61 for electrical connection with the positive and negative test leads of the insulation tester, respectively. Specifically, the second sliding sleeve 612 is fixedly mounted on the movable end of the lifting frame assembly 4 by screws. It is a linear bearing sleeve, which can effectively reduce the friction between the test probe 611 and the test probe 611. The upper end of the test probe 611 passes through the second spring 613 and the second sliding sleeve 612 from bottom to top and is then held in place by the second snap-fit ​​medium 614, allowing it to slide up and down within the second sliding sleeve 612 without falling off. The lower end of the second spring 613 abuts against the lower protrusion of the test probe 611, and its upper end abuts against the movable end of the lifting frame assembly 4, driving the test probe 611 to slide downward. The upper end of the test probe 611 is electrically connected to the positive or negative test probe of the insulation tester via a wire and a relay 18 (normally open relay). Its lower end is movably pressed against the positive and negative terminals of the battery cell. At any given time, only one of the ten sets of relays 18 can conduct electricity with the insulation tester. Each set of relays 18 consists of two relays, corresponding to the positive and negative terminals of the same battery cell.

[0039] This invention's equipment, controlled by a PLC controller, uses ten sets of relays 18 to perform continuous insulation testing (i.e., short-circuit testing) on ​​ten circuits. Taking the order from left to right as an example, when testing the insulation performance of the first battery cell, the first set of relays 18 on the left is engaged, while the remaining relays 18 remain disengaged. This ensures electrical conductivity between the positive and negative terminals of the first battery cell and the test probes 611 pressed above them, allowing the short-circuit test to be completed using the test voltage and test time set by the short-circuit tester. After the test, the relays 18 automatically disengage, and the next set of relays 18 automatically engages, repeating this process until all ten battery cell short-circuit tests are completed. During the test, any points where insulation fails to meet standards will automatically illuminate red on the insulation indicator light 13.

[0040] Since the insulation test time for a single battery cell is generally 3 seconds, while the airtightness test usually takes 30-60 seconds, the equipment provided by this invention can simultaneously complete the airtightness and insulation tests of ten battery cells in 30-60 seconds. Compared with the step-by-step testing of a single battery cell, the efficiency is improved by at least 10 times.

[0041] Furthermore, the lifting frame assembly 4 includes four columns 41 mounted on the mounting plate 11, a fixed plate 42 mounted on the four columns 41, a lifting plate 43 slidably mounted on the four columns 41, and a lifting cylinder 44 mounted on the fixed plate 42 for driving the lifting plate 43 to slide; the piston rod of the lifting cylinder 44 is fixedly connected to the lifting plate 43; the lifting plate 43 is provided with a bakelite board 431 for insulation, and the bakelite board 431 is fixedly connected to the first sliding sleeve 53 and the second sliding sleeve 612 respectively; the first spring 54 and the second spring 613 both abut against the bakelite board 431.

[0042] As shown in Figures 1-6, the bottoms of the four columns 41 are fixedly mounted on the mounting plate 11 with screws, and are also fixedly connected to the fixing plate 42 with screws. The four corners of the lifting plate 43 are mounted on the columns 41 via linear bearing sleeves. The cylinder seat of the lifting cylinder 44 is mounted on the center of the fixing plate 42 with screws, and its piston rod end is threaded and mounted on the lifting plate 43 with a nut. The lifting cylinder 44 is electrically connected to the PLC controller via a solenoid valve, driving the lifting plate 43 to rise and fall under the control of the PLC controller. To avoid interference between the individual battery cells during insulation testing, a bakelite board 431 is embedded in the middle of the lifting plate 43. The bakelite board 431 is embedded in the limiting groove of the lifting plate 43 and can be easily removed and replaced to accommodate battery cell tests of different sizes. Simultaneously, the multi-cell placement box 3 should also be made of insulating materials such as bakelite. At this time, the first sleeve 53 and the second sleeve 612 are both mounted on the bakelite board 431.

[0043] The testing method of the above-mentioned multi-cell testing equipment includes the following steps:

[0044] (1) Place ten cells to be tested on the multi-cell placement box 3. After pressing the test button, the PLC controller controls the drive motor 7 to drive the rotary table 2 to rotate 180 degrees and screw one multi-cell placement box 3 into the test station.

[0045] (2) The PLC controller controls the lifting cylinder 44 in the lifting frame assembly 4 to drive the vacuum detection assembly 5 and the insulation test assembly 6 to descend, so that the suction nozzle 52 in the vacuum detection assembly 5 presses against the liquid injection hole of the battery cell, and the test probe 611 in the insulation test assembly 6 presses against the positive and negative terminals of the battery cell.

[0046] (3) Under the control of the PLC controller, first close the inflation solenoid valve 17, then open the degassing solenoid valve 16, and at the same time perform air tightness test on the ten cells; among them, the degassing solenoid valve 16 is opened for 30 seconds to degas, and then closed to maintain pressure until the air tightness test is completed, and the test is displayed on the air tightness indicator light 12.

[0047] (4) While performing step (3), the insulation tester performs insulation tests on each of the ten cells one by one. Each cell is tested for 3 seconds. After 30 seconds, the insulation test is completed and the test results are displayed on the insulation indicator light 13.

[0048] (5) After the air tightness test is completed, the PLC controller controls the air filling solenoid valve 17 to open and break the vacuum, and then controls the rotary table 2 to rotate 180 degrees to remove the ten tested cells.

[0049] In summary, this invention has the following beneficial effects: The equipment provided by this invention can simultaneously complete the airtightness and short-circuit tests of 10 battery cells in the time it takes to complete the airtightness test of a single battery cell in the traditional method, increasing efficiency by at least 10 times. The dual rotating positions of the rotary table 2 divide the equipment provided by this invention into a working area and a testing area, allowing for continuous operation during testing. The introduction of multiple sets of relays 18 that are independently connected to the insulation tester enables continuous insulation testing of ten channels. The addition of multiple airtightness indicator lights 12 and insulation indicator lights 13 allows the operator to intuitively understand the battery cell fault status in real time and promptly remove faulty battery cells.

[0050] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A multi-cell testing device, characterized in that, The device includes a frame, a mounting plate located in the middle of the frame, a rotating platform rotatably mounted on the mounting plate, two multi-cell placement boxes mounted on the rotating platform, a lifting frame assembly mounted on the mounting plate, several vacuum testing components located at the movable ends of the lifting frame assembly for moving and pressing against the electrolyte injection holes of the cells to perform airtightness testing, several insulation testing components located at the movable ends of the lifting frame assembly for moving and pressing against the positive and negative terminals of the cells to perform insulation testing, and a drive motor mounted on the mounting plate for driving the rotating platform to rotate; the output shaft of the drive motor is connected to the rotating platform for transmission; the number of vacuum testing components and the number of insulation testing components correspond one-to-one with the number of cells on the multi-cell placement boxes.

2. The multi-cell detection apparatus of claim 1, wherein The bottom of the frame is equipped with a vacuum pump, a buffer tank, several suction solenoid valves that are paired with the vacuum detection components, and several charging solenoid valves that are paired with the vacuum detection components and used to break the vacuum. One port of the suction solenoid valve is connected to the buffer tank, and the other port is connected to the corresponding vacuum detection component. Any port of the charging solenoid valve is connected to the corresponding vacuum detection component. The suction port of the vacuum pump is connected to the buffer tank.

3. The multi-cell testing equipment according to claim 2, characterized in that, Both the inflation solenoid valve and the deflation solenoid valve are two-position two-way solenoid valves.

4. The multi-cell detection apparatus of claim 3, wherein, The vacuum testing assembly includes a vacuum probe, a nozzle located at the lower end of the vacuum probe and used to press against the battery cell injection hole for airtightness testing, a first sliding sleeve slidably sleeved and locked onto the vacuum probe, and a first spring sleeved on the vacuum probe; the first sliding sleeve is fixedly connected to the movable end of the lifting frame assembly; one end of the first spring presses against the vacuum probe, and the other end presses against the movable end of the lifting frame assembly; the lower end of the vacuum probe is connected to the nozzle, and its upper end is connected to another interface of the vacuum solenoid valve and any interface of the inflation solenoid valve.

5. The multi-cell detection apparatus of claim 4, wherein, A silencer filter is installed on the interface of the inflation solenoid valve that is not connected to the vacuum probe.

6. The multi-cell testing equipment according to claim 4, characterized in that, It also includes an insulation tester mounted on the rack or lifting frame assembly, which is electrically connected to the insulation test assembly.

7. The multi-cell testing equipment according to claim 6, characterized in that, The insulation testing assembly includes two test probe assemblies; one test probe assembly is connected to one test pen of the insulation tester, and the other test probe assembly is connected to another test pen of the insulation tester; the test probe assembly includes a test probe for moving and pressing against the cell terminal to perform insulation testing, a second sliding sleeve that is slidably sleeved and locked onto the test probe, and a second spring sleeved on the test probe; the second sliding sleeve is fixedly connected to the movable end of the lifting frame assembly; one end of the second spring presses against the test probe, and the other end presses against the movable end of the lifting frame assembly; the upper end of the test probe is connected to the corresponding test pen of the insulation tester, and its lower end moves and presses against the positive or negative terminal of the cell.

8. The multi-cell testing equipment according to claim 7, characterized in that, The lifting frame assembly includes four columns mounted on a mounting plate, a fixed plate mounted on the four columns, a lifting plate slidably mounted on the four columns, and a lifting cylinder mounted on the fixed plate for driving the lifting plate to slide. The piston rod of the lifting cylinder is fixedly connected to the lifting plate. The lifting plate is provided with a bakelite board for insulation, and the bakelite board is fixedly connected to the first sliding sleeve and the second sliding sleeve respectively. The first spring and the second spring both abut against the bakelite board.

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