Multi-cell detection equipment and detection method thereof

Abstract

The invention relates to the technical field of battery cell manufacturing, in particular to multi-battery cell detection equipment and a detection method thereof. 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 equipment provided by the invention, multiple groups of vacuum detection assemblies and insulation test assemblies are simultaneously arranged on the lifting frame assembly, so that the multi-cell detection equipment provided by the invention can simultaneously complete air tightness and insulation tests of at least 10 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

Technical Field

[0001] The present invention relates to the technical field of battery cell manufacturing, and more specifically, it relates to a multi-battery cell detection device and a detection method thereof. Background Art

[0002] In order to ensure the safety of electric vehicles and energy storage systems, during the manufacturing process of battery cells (such as lithium iron phosphate battery cells and ternary lithium battery cells), airtightness detection and insulation detection of the battery cells need to be carried out.

[0003] Existing devices for airtightness detection and insulation detection of battery cells are independent. Either they can only perform airtightness detection on battery cells, or they can only perform insulation detection on battery cells. They cannot simultaneously perform airtightness detection and insulation detection on multiple battery cells, resulting in low detection efficiency and waste of production resources. Summary of the Invention

[0004] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide a multi-battery cell detection device, which is used to solve the technical problem that the existing detection devices cannot simultaneously perform airtightness detection and insulation detection on multiple battery cells, resulting in low detection efficiency.

[0005] The above technical purpose of the present invention is achieved through the following technical solutions:

[0006] A multi-battery cell detection device includes a frame, a mounting plate provided in the middle of the frame, a rotating table rotatably provided on the mounting plate, two multi-battery cell placement boxes provided on the rotating table, a lifting frame assembly provided on the mounting plate, a plurality of vacuum detection components provided at the movable end of the lifting frame assembly and used to movably press against the liquid injection holes of the battery cells to perform airtightness detection, a plurality of insulation test components provided at the movable end of the lifting frame assembly and used to movably press against the positive and negative electrode posts of the battery cells to perform insulation detection, and a driving motor provided on the mounting plate and used to drive the rotating table to rotate; the output shaft of the driving motor is in transmission connection with the rotating table; the number of the plurality of vacuum detection components and the number of the plurality of insulation test components both correspond one-to-one to the number of battery cells on the multi-battery cell placement box.

[0007] Optionally, a vacuum pump, a buffer tank, a plurality of air extraction solenoid valves in one-to-one correspondence with the vacuum detection components, and a plurality of inflation solenoid valves in one-to-one correspondence with the vacuum detection components and used to break the vacuum are provided at the bottom of the frame; one interface of the air extraction solenoid valve is communicated with the buffer tank, and the other interface is communicated with the corresponding vacuum detection component; any interface of the inflation solenoid valve is communicated with the corresponding vacuum detection component; the suction port of the vacuum pump is communicated with the buffer tank.

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

[0009] Optionally, the vacuum detection assembly includes a vacuum probe, a suction nozzle disposed at the lower end of the vacuum probe and used to actively press against the liquid injection hole of the battery cell for airtightness detection, a first sliding sleeve slidably sleeved and clamped on 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 communicated with the suction nozzle, and the upper end thereof is respectively communicated with another interface of the air extraction solenoid valve and any interface of the air inflation solenoid valve.

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

[0011] Optionally, it further includes an insulation tester disposed on the frame or the lifting frame assembly, and the insulation tester is electrically connected to the insulation test assembly.

[0012] Optionally, the insulation test assembly includes two test probe assemblies; one test probe assembly is electrically connected to one test pen of the insulation tester, and the other test probe assembly is electrically connected to the other test pen of the insulation tester; the test probe assembly includes a test probe used to actively press against the battery cell pole for insulation detection, a second sliding sleeve slidably sleeved and clamped on 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 electrically connected to the corresponding test pen of the insulation tester, and the lower end thereof actively presses against the positive pole or the negative pole of the battery cell.

[0013] Optionally, the lifting frame assembly includes four columns disposed on the mounting plate, a fixing plate disposed on the four columns, a lifting plate slidably disposed on the four columns, and a lifting cylinder disposed on the fixing plate and used to drive the lifting plate to slide; the piston rod of the lifting cylinder is fixedly connected to the lifting plate; a bakelite board for insulation is disposed on the lifting plate, 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 press against the bakelite board.

[0014] The present invention also provides a detection method based on the foregoing multi-battery cell detection device, which includes the following steps:

[0015] (1) Place a plurality of battery cells to be detected on the multi-battery cell placement box, and control the driving motor to drive the rotating table to rotate 180 degrees;

[0016] (2) Control the lifting frame assembly to drive the vacuum detection assembly and the insulation test assembly to descend, so that the vacuum detection assembly presses against the liquid injection hole of the battery cell, and the insulation test assembly presses against the positive and negative poles of the battery cell;

[0017] (3) Close the air inflation solenoid valve, open the air extraction solenoid valve, and simultaneously perform airtightness detection on a plurality of battery cells;

[0018] (4) While performing step (3), the insulation of multiple battery cells is detected one by one.

[0019] (5) After the airtightness detection is completed, control the turntable to rotate 180 degrees and remove the multiple tested battery cells.

[0020] Optionally, the total time for airtightness detection is 30 - 60 s, and the insulation detection time for a single battery cell is 3 s.

[0021] In summary, the present invention has the following beneficial effects: By simultaneously arranging multiple groups of vacuum detection components and insulation test components on the lifting frame assembly, the multi - battery - cell detection device provided by the present invention can complete the airtightness and insulation tests of at least 10 battery cells within the time when a traditional single battery cell completes the airtightness detection, and the efficiency is increased by at least 10 times. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic structural diagram of the present invention;

[0023] Figure 2 is a partial structural diagram of the present invention;

[0024] Figure 3 is Figure 2 the front view of

[0025] Figure 4 is Figure 2 the partial structural diagram of

[0026] Figure 5 is Figure 4 the side view of

[0027] Figure 6 is an exploded view of the vacuum detection component and the insulation detection component in the present invention;

[0028] Figure 7 is a partial gas circuit diagram of the airtightness detection in the present invention;

[0029] Figure 8 is a partial circuit diagram of the insulation test in the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] To make the objectives, features, and advantages of the present invention more obvious and understandable, the following detailed description of the specific embodiments of the present invention is provided with reference to the accompanying drawings. Several embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein.

[0031] In the present invention, unless otherwise clearly specified or limited, terms such as "installed", "connected", "linked", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0032] In the present invention, unless otherwise clearly specified or limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features between them. Moreover, the first feature being "above", "over" and "on the top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature. Terms such as "vertical", "horizontal", "left", "right", "up", "down" and similar expressions are only for the purpose of illustration, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present invention.

[0033] The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0034] The present invention provides a multi-cell detection device, as Figure 1-6 shown, which includes a frame 1, a mounting plate 11 disposed in the middle of the frame 1, a rotating table 2 rotatably disposed on the mounting plate 11, two multi-cell placement boxes 3 disposed on the rotating table 2, a lifting frame assembly 4 disposed on the mounting plate 11, a plurality of vacuum detection components 5 disposed at the movable end of the lifting frame assembly 4 and used for movably pressing against the liquid injection holes of the cells to perform airtightness detection, a plurality of insulation test components 6 disposed at the movable end of the lifting frame assembly 4 and used for movably pressing against the positive and negative electrode posts of the cells to perform insulation detection, and a driving motor 7 disposed on the mounting plate 11 and used for driving the rotating table 2 to rotate; the output shaft of the driving motor 7 is in transmission connection with the rotating table 2; the number of the plurality of vacuum detection components 5 and the number of the plurality of insulation test components 6 both correspond one-to-one to the number of cells on the multi-cell placement box 3.

[0035] Specifically, the mounting plate 11 is fixedly installed in the middle position of the frame 1 by screws, and the rotating table 2 is installed on the upper surface of the mounting plate 11 through a load-bearing bearing; the driving motor 7 is a stepping reduction motor, and its fixed end is fixedly installed on the lower surface of the mounting plate 11 by screws, and its output shaft is fixedly connected to the geometric center of the rotating table 2. Two rectangular limiting grooves (i.e., a two-station turntable) are symmetrically arranged on the rotating table 2, and two multi-cell placement boxes 3 are placed in the corresponding rectangular limiting grooves; ten cell grooves for accommodating cells are arranged on the multi-cell placement box 3 from left to right. The lifting frame assembly 4 is fixedly installed on the upper surface of the mounting plate 11 by 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 installed on the movable end of the lifting frame assembly 4 by screws. During the descending process, the vacuum detection component 5 can press against the cell injection hole to perform airtightness detection, and during the descending process, the insulation test component 6 can press against the positive and negative electrode posts of the cell to perform insulation detection. The number and positions of the vacuum detection components 5 and the ten insulation test components 6 correspond one by one to the number and positions of the cells. A human-machine interface display screen (not marked in the attached drawing), ten airtightness indicator lights 12, and ten insulation indicator lights 13 are installed at the top position of the frame 1. When the airtightness of the corresponding cell is qualified, the airtightness indicator light 12 shows green; when the airtightness of the corresponding cell is unqualified, the airtightness indicator light 12 shows red; when the insulation of the corresponding cell is qualified, the insulation indicator light 13 shows green; when the insulation of the corresponding cell is unqualified, the insulation indicator light 13 shows red.

[0036] With the above structure of the present invention, by simultaneously arranging ten groups of vacuum detection components 5 and insulation test components 6 on the lifting frame assembly 4, the multi-cell detection device provided by the present invention can simultaneously complete the airtightness and insulation tests of at least 10 cells within the time required for a traditional single cell to complete the airtightness detection, and the efficiency is increased by at least 10 times.

[0037] Furthermore, a vacuum pump 14, a buffer tank 15, a number of air extraction solenoid valves 16 corresponding one by one to the vacuum detection components 5, and a number of inflation solenoid valves 17 corresponding one by one to the vacuum detection components 5 and used for breaking vacuum are arranged at the bottom of the frame 1; one interface of the air extraction solenoid valve 16 is communicated with the buffer tank 15, and the other interface is communicated with the corresponding vacuum detection component 5; any interface of the inflation solenoid valve 17 is communicated with the corresponding vacuum detection component 5; the suction port of the vacuum pump 14 is communicated with the buffer tank 15.

[0038] Furthermore, both the inflation solenoid valve 17 and the air extraction 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, which can be understood as a solenoid valve composed of a conventional two-position two-way solenoid valve and a one-way valve.

[0039] AsFigure 1 and Figure 7 As shown in Figure 7 , inside the bottom space of the rack 1, a vacuum pump 14, a buffer tank 15, ten air extraction solenoid valves 16, ten air inflation solenoid valves 17 and a PLC controller (not shown in the attached drawings) are installed. The vacuum pump 14, the air extraction solenoid valves 16, the air inflation solenoid valves 17, the airtightness indicator light 12, the insulation indicator light 13, the drive motor 7 and the 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 through a conduit. The buffer tank 15 is connected to the left-end interfaces of the corresponding air extraction solenoid valves 16 through ten conduits. The right-end interfaces of the air extraction solenoid valves 16 are connected to the vacuum detection assembly 5 through conduits. The right-end interfaces of the air inflation solenoid valves 17 are connected to the vacuum detection assembly 5 through conduits. The ten air extraction solenoid valves 16 and the ten air inflation solenoid valves 17 are independently controlled by the PLC controller. Traditional airtightness detection mainly focuses on single-station single-cell detection. One of the innovation points of the present invention is the addition of the buffer tank 15, which can ensure that when 10 cells are evacuated simultaneously, the extracted gas will not cause the test time to be extended due to excessive gas volume. That is, within the time required for traditional single-cell airtightness detection, the equipment provided by the present invention can also complete the airtightness detection of 10 cells, and the efficiency is increased by 10 times.

[0040] Furthermore, the vacuum detection assembly 5 includes a vacuum probe 51, a suction nozzle 52 provided at the lower end of the vacuum probe 51 and used to actively press against the liquid injection hole of the cell for airtightness detection, a first sliding sleeve 53 slidably sleeved and clamped on 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 the upper end thereof is respectively connected to another interface of the air extraction solenoid valve 16 and any interface of the air inflation solenoid valve 17.

[0041] As Figure 1-7As shown in the figure, the first sliding sleeve 53 is fixedly installed on the movable end of the lifting frame assembly 4 by screws. It is a linear bearing sleeve, which can effectively reduce the friction with the vacuum probe tube 51. The upper end of the vacuum probe tube 51 sequentially passes through the first spring 54 and the first sliding sleeve 53 from bottom to top and is clamped by the first clamping spacer 55, so that it can slide up and down in the first sliding sleeve 53 and will not fall off. The lower end of the first spring 54 abuts against the lower convex part of the vacuum probe tube 51, and its upper end abuts against the movable end of the lifting frame assembly 4, which is used to drive the vacuum probe tube 51 to slide downward. The upper end of the vacuum probe tube 51 is connected to the right end interface of the air extraction solenoid valve 16 through a conduit, and it is hermetically inserted into the suction nozzle 52 made of silica gel material. The suction nozzle 52 can effectively ensure the sealing performance of the connection with the cell injection hole and reduce the misjudgment or wrong judgment of the airtightness test. The present invention extracts gas from the inside of the test cell through the cell injection hole, monitors the internal pressure change, and judges the sealing performance of the cell. If the cell has good sealing performance, the internal pressure change of the cell will be very small. If the cell leaks, the internal pressure of the cell will change rapidly. By comparing the pressure difference at the beginning and the end, the device can judge whether the airtightness of the cell meets the standard.

[0042] Further, as Figure 7 shown, in order to reduce the noise generated by breaking the vacuum after the airtightness test and prevent environmental foreign matters from entering the inside of the cell through the inflation solenoid valve 17, a silencing filter (not shown in the attached drawing) is installed on the interface of the inflation solenoid valve 17 that is not connected to the vacuum probe tube 51 (the other interface of the inflation solenoid valve 17).

[0043] Further, it also includes an insulation tester (not shown in the attached drawing) provided on the frame 1 or the lifting frame assembly 4, and the insulation tester is electrically connected to the insulation test assembly 6.

[0044] Further, the insulation test assembly 6 includes two test probe assemblies 61. One test probe assembly 61 is electrically connected to one test lead of the insulation tester, and the other test probe assembly 61 is electrically connected to the other test lead of the insulation tester. The test probe assembly 61 includes a test probe 611 for actively abutting against the cell pole column to perform insulation detection, a second sliding sleeve 612 slidably sleeved and clamped on 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 abuts against the test probe 611, and the other end abuts against the movable end of the lifting frame assembly 4. The upper end of the test probe 611 is electrically connected to the corresponding test lead of the insulation tester, and its lower end actively abuts against the positive or negative pole column of the cell.

[0045] As Figure 1-8As shown, the insulation tester is a conventional short-circuit tester, which has a positive test probe and a negative test probe, and can be installed on the rack 1 or the lifting frame assembly 4 according to actual needs. The insulation test assembly 6 includes two test probe assemblies 61 respectively used for electrically connecting with the positive test probe and the negative test probe of the insulation tester. Specifically, the second sliding sleeve 612 is fixedly installed on the movable end of the lifting frame assembly 4 through screws. It is a linear bearing sleeve, which can effectively reduce the friction force with the test probe 611. The upper end of the test probe 611 sequentially passes through the second spring 613 and the second sliding sleeve 612 from bottom to top and is clamped by the second clamping washer 614, so that it can slide up and down in the second sliding sleeve 612 and will not fall off. The lower end of the second spring 613 abuts against the lower end convex part of the test probe 611, and its upper end abuts against the movable end of the lifting frame assembly 4, and is used to drive the test probe 611 to slide downward. The upper end of the test probe 611 is electrically connected to the positive test probe or the negative test probe of the insulation tester through a wire and a relay 18 (normally open relay), and its lower end movably abuts against the positive electrode column and the negative electrode column of the battery cell. Among the ten groups of relays 18, only one group of relays 18 can be electrically connected to the insulation tester at the same time. The number of each group of relays 18 is two, corresponding to the positive and negative electrode columns of the same battery cell.

[0046] The device of the present invention can realize continuous ten-way insulation test (i.e., short-circuit test) by controlling ten groups of relays 18 through the PLC controller. Taking the order from left to right as an example, when testing the insulation performance of the first battery cell, the leftmost first group of relays 18 is attracted, and the rest of the relays 18 remain in the released state, that is, the positive and negative electrodes of the first-way battery cell and the test probe 611 pressed above it are electrically connected to the short-circuit tester, and the short-circuit test is completed through the test voltage and test time set by the short-circuit tester. After the test is completed, the relay 18 automatically releases, and the next group of relays 18 automatically attracts, and so on until all ten-way battery cell short-circuit tests are completed. During the test process, the points with unqualified insulation automatically light up a red light on the insulation indicator light 13.

[0047] Since the insulation test time of a single battery cell is generally 3s, while the airtightness test is usually 30 - 60s, the device provided by the present invention can complete the airtightness test and insulation test of ten battery cells simultaneously in 30 - 60s. Compared with the step-by-step test of single battery cells, the efficiency is increased by at least more than 10 times.

[0048] Further, the lifting frame assembly 4 includes four columns 41 arranged on the mounting plate 11, a fixing plate 42 arranged on the four columns 41, a lifting plate 43 slidably arranged on the four columns 41, and a lifting cylinder 44 arranged on the fixing plate 42 and used to drive the lifting plate 43 to slide; the piston rod of the lifting cylinder 44 is fixedly connected to the lifting plate 43; a bakelite board 431 for insulation is arranged on the lifting plate 43, 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.

[0049] As Figure 1-6 shown, the bottoms of the four columns 41 are fixedly installed on the mounting plate 11 by screws, and they are fixedly connected to the fixing plate 42 by screws. The four end corners of the lifting plate 43 are all installed on the columns 41 through linear bearing bushings. The cylinder block of the lifting cylinder 44 is installed at the central position of the fixing plate 42 by screws, and the end of its piston rod has a thread and is installed on the lifting plate 43 by a nut. The lifting cylinder 44 is electrically connected to the PLC controller through a solenoid valve and drives the lifting plate 43 to lift under the control of the PLC controller. In order to prevent interference between each battery cell during the insulation test, 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 adapt to the testing of battery cells of different sizes. At the same time, the multi-battery cell placement box 3 should also be made of insulating materials such as bakelite. At this time, both the first sliding sleeve 53 and the second sliding sleeve 612 are installed on the bakelite board 431.

[0050] The present invention also provides a detection method for the multi-battery cell detection device based on the above, which includes the following steps:

[0051] (1) Place ten battery cells to be detected on the multi-battery cell placement box 3. After pressing the test button, the PLC controller controls the driving motor 7 to drive the rotating table 2 to rotate 180 degrees, and screws a multi-battery cell placement box 3 into the test station;

[0052] (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 abuts against the liquid injection hole of the battery cell, and the test probe 611 in the insulation test assembly 6 abuts against the positive and negative electrode posts of the battery cell;

[0053] (3) Under the control of the PLC controller, first close the inflation solenoid valve 17, then open the exhaust solenoid valve 16, and simultaneously perform airtightness detection on ten battery cells; among them, the exhaust solenoid valve 16 is first opened for 30S for exhaust, and then closed for pressure holding until the airtightness test is completed, and the test result is displayed on the airtightness indicator light 12;

[0054] (4) While performing step (3), the insulation tester conducts insulation tests on the ten battery cells one by one, with each battery cell tested for 3 seconds. After 30 seconds, the insulation test is completed, and the test results are displayed on the insulation indicator light 13.

[0055] (5) After the airtightness test is completed, the PLC controller controls the inflation solenoid valve 17 to open for breaking the vacuum, and then controls the turntable 2 to rotate 180 degrees to remove the ten tested battery cells.

[0056] In summary, the present invention has the following beneficial effects: The equipment provided by the present invention can simultaneously complete the airtightness and short-circuit tests of 10 battery cells within the time required for a traditional single battery cell to complete the airtightness test, with the efficiency increased by at least 10 times. The double-rotation workstations of the turntable 2 divide the equipment provided by the present invention into an operation area and a test area, enabling continuous operation during testing. By introducing multiple groups of relays 18 that are independent of each other and connected to the insulation tester, ten-way continuous insulation testing can be achieved. With the addition of multiple airtightness indicator lights 12 and insulation indicator lights 13, the operator can intuitively understand the battery cell failure situation in real time and promptly remove the faulty battery cells.

[0057] The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the concept of the present invention belong to the protection scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements should also be regarded as within the protection scope of the present invention.

Claims

1. A multi-cell testing device, characterized in that: The utility model comprises a frame, a mounting plate arranged in the middle of the frame, a rotating table rotatably arranged on the mounting plate, two multi-cell placement boxes arranged on the rotating table, a lifting frame assembly arranged on the mounting plate, a plurality of vacuum detection assemblies arranged at the movable end of the lifting frame assembly and used for movably pressing against the liquid injection holes of the battery cells for air tightness detection, a plurality of insulation test assemblies arranged at the movable end of the lifting frame assembly and used for movably pressing against the positive and negative poles of the battery cells for insulation detection, and a driving motor arranged on the mounting plate and used for driving the rotating table to rotate; the output shaft of the driving motor is transmission-connected to the rotating table; the number of the plurality of vacuum detection assemblies and the number of the plurality of insulation test assemblies correspond one-to-one to the number of battery cells on the multi-cell placement box.

2. The multi-cell detection device according to claim 1, characterized in that: A vacuum pump, a buffer tank, several exhaust solenoid valves corresponding to the vacuum detection components, and several inflation solenoid valves corresponding to the vacuum detection components and used for breaking the vacuum are arranged at the bottom of the frame; one interface of the exhaust solenoid valve is connected to the buffer tank, and the other interface is connected to the corresponding vacuum detection component; any interface of the inflation 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 detection equipment according to claim 2, characterized in that: Both the charging solenoid valve and the exhaust solenoid valve are two-position two-way solenoid valves.

4. The multi-cell detection device according to claim 3, characterized in that: The vacuum detection assembly includes a vacuum probe, a suction nozzle arranged at the lower end of the vacuum probe and used to movably press against the liquid injection hole of the battery cell for airtightness detection, a first sliding sleeve slidably mounted and clamped on the vacuum probe, and a first spring mounted 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 suction nozzle, and the upper end of the vacuum probe is respectively connected to the other interface of the vacuum solenoid valve and any interface of the inflation solenoid valve.

5. The multi-cell detection device according to claim 4, characterized in that: 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 detection device according to claim 4, characterized in that: It also includes an insulation tester arranged on the frame or the lifting frame assembly, and the insulation tester is electrically connected to the insulation test assembly.

7. The multi-cell detection device according to claim 6, characterized in that: The insulation test assembly includes two test probe assemblies; one test probe assembly is electrically connected to one test probe of the insulation tester, and the other test probe assembly is electrically connected to the other test probe of the insulation tester; the test probe assembly includes a test probe used to movably press against the battery cell pole to perform insulation detection, a second sliding sleeve slidably mounted and clamped on the test probe, and a second spring mounted 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 electrically connected to the corresponding test probe of the insulation tester, and the lower end of the test probe movably presses against the positive pole or negative pole of the battery cell.

8. The multi-cell detection device according to claim 7, characterized in that: The lifting frame assembly includes four columns arranged on the mounting plate, a fixed plate arranged on the four columns, a lifting plate slidably arranged on the four columns, and a lifting cylinder arranged on the fixed plate and used for driving the lifting plate to slide; the piston rod of the lifting cylinder is fixedly connected to the lifting plate; an insulating bakelite board is arranged on the lifting plate, and the bakelite board is respectively fixedly connected to the first sliding sleeve and the second sliding sleeve; the first spring and the second spring are both pressed against the bakelite board.

9. A detection method based on the multi-cell detection device according to any one of claims 1 to 8, characterized in that: The steps include: (1) Place multiple battery cells to be tested on a multi-battery cell placement box, and control the drive motor to drive the rotating table to rotate 180 degrees; (2) Control the lifting frame assembly to drive the vacuum detection assembly and the insulation test assembly to descend, so that the vacuum detection assembly is pressed against the battery cell injection hole, and the insulation test assembly is pressed against the positive and negative poles of the battery cell; (3) Close the inflation solenoid valve, open the exhaust solenoid valve, and perform air-tightness testing on multiple cells at the same time; (4) while performing step (3), performing insulation testing on the plurality of battery cells one by one; (5) After the air tightness test is completed, the rotating table is controlled to rotate 180 degrees and the multiple battery cells that have been tested are removed.

10. The detection method according to claim 9, characterized in that: The total time for air tightness testing is 30-60s, and the insulation testing time for a single battery cell is 3S.

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