Lithium battery cell large leakage detection equipment

Abstract

The utility model belongs to the technical field of lithium battery cell detection, and particularly relates to lithium battery cell big leakage detection equipment, which comprises a rack and a suction gun type helium detector for detecting a battery cell, the suction gun type helium detector is arranged on one side of the rack, a lifting unit for lifting the battery cell upwards from a track is arranged on the rack, and the lifting unit is connected with the rack. A plurality of battery cells are lifted upwards by the lifting unit; in the aspect of sealing performance detection, helium detection is used for replacing traditional gas detection, and the leakage detection efficiency and the leakage detection precision can be obviously improved in the fields of leakage detection efficiency and leakage detection precision. Compared with a traditional leak detection method, the helium detection efficiency is high, the leak detection precision is 3-4 orders of magnitude higher, and no influence is caused to the battery. However, a positive pressure bubble leak detection method commonly adopted in the current lithium battery industry is easy to cause deformation of a battery shell, meanwhile, the detection efficiency and the detection precision are relatively low, and the positive pressure bubble leak detection method is particularly not suitable for a metal shell and an aluminum plastic film flexible package lithium ion battery. Helium mass spectrum leak detection has obvious advantages in battery leak detection.

Description

Technical Field

[0001] The utility model belongs to the technical field of lithium battery core detection, and in particular relates to a lithium battery core major leakage detection device. Background Art

[0002] With the rapid development of the electric vehicle industry and the increasing demand for electric vehicles, battery manufacturers need to continuously improve production efficiency to meet market demand. At present, the production of batteries is done by assembling different cells in different production workshops, and then the assemblers assemble the produced battery modules together into a PACK, thus forming a complete battery pack. Therefore, to ensure the production efficiency of electric vehicles, the production efficiency of each PACK must be guaranteed.

[0003] As the core component of battery cars, the production of battery PACK is an important part of electric car production. Since the current PACK is assembled from modules, and the modules are composed of battery cells, the production of battery cells is particularly important, which is related to the mileage, safety life and reliability of electric vehicles. In particular, the phenomenon of battery burning and spontaneous combustion during charging has repeatedly occurred, which has made battery manufacturers pay more attention to the quality of battery cells.

[0004] As we all know, leakage can cause many problems in lithium batteries, such as electrolyte evaporation, water penetration, swelling, etc., which can cause lithium battery performance degradation and even fire and explosion. The sealing performance of the battery shell directly determines the safety factor of the battery, so it is particularly important to improve the precision and efficiency of lithium battery leakage inspection.

[0005] In order to solve the above problems, this application proposes a lithium battery cell major leakage detection device. Utility Model Content

[0006] In order to solve the above problems existing in the prior art, the utility model provides a lithium battery cell major leakage detection device, which has the characteristics of detecting major leakage cells in advance, avoiding contamination of small leakage chambers, and improving helium detection efficiency.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a lithium battery cell leakage detection device, comprising a frame and a suction gun type helium detector for detecting the cell, the suction gun type helium detector is installed on one side of the frame, the frame is equipped with a lifting unit for lifting the cell upward from the track, the lifting unit lifts a plurality of cells upward, and also includes a clamping unit located in the frame, the clamping unit can simultaneously clamp the plurality of cells lifted by the lifting unit, the frame is equipped with a lifting unit, the clamping unit is installed on the frame, The lifting unit is on the frame, and the clamping unit moves up and down inside the frame through the lifting unit. The frame is equipped with a plurality of sealing units with the same number as the lifting cells on the lifting unit. The sealing units are connected to the suction gun type helium detector to perform helium inspection on the cells clamped by the clamping unit. The frame is also equipped with a leakage bottle calibration unit, and the cells on the lifting unit are calibrated by the leakage bottle calibration unit. The frame is equipped with a lifting cylinder for driving the sealing unit to lift and lower, and the lifting unit is equipped with an X-axis cylinder for driving the clamping unit to clamp the cells.

[0008] As a preferred technical solution of the utility model, the lifting unit includes a connecting base fixedly mounted on the frame, an electric cylinder fixedly mounted at the lower end of the connecting base, and a push rod fixed at the output end of the electric cylinder, wherein the push rod is provided with a support plate for lifting the battery cell on the track.

[0009] As a preferred technical solution of the utility model, a guide sleeve is fixed on the connecting seat, and the push rod penetrates and slides in the guide sleeve.

[0010] As a preferred technical solution of the utility model, the lifting unit includes a support fixed on the frame, a Y-axis cylinder fixed on the upper end of the support, and a sliding seat slidably arranged on one side of the support.

[0011] As a preferred technical solution of the utility model, the support and the sliding seat are connected by a linear slide rail, and the support is provided with a hydraulic buffer located at the bottom of the linear slide rail, and the clamping unit is installed on the sliding seat.

[0012] As a preferred technical solution of the utility model, the clamping unit includes a connecting plate sliding horizontally on a sliding seat and a driving rod fixed to the output end of the X-axis cylinder, as well as an inclined groove fixed on the connecting plate and a clamping claw arranged on the connecting plate.

[0013] As a preferred technical solution of the utility model, a horizontal linear slide rail is provided between the connecting plate and the sliding seat, and the clamping unit further comprises a clamping plate fixed on the sliding seat and cooperating with the clamping claws to clamp the battery cell.

[0014] As a preferred technical solution of the utility model, the sealing unit includes a No. 1 sealing rod fixed at the output end of the lifting cylinder and a No. 2 sealing rod fixed at the lower end of the No. 1 sealing rod, as well as a collecting block arranged at the upper end of the No. 1 sealing rod through a bracket and a suction gun cylinder fixed at the upper end of the bracket, and a filter, a flow suppressor, and a blind cover nut are also arranged between the No. 1 sealing rod and the No. 2 sealing rod.

[0015] As a preferred technical solution of the utility model, a plug is provided on the No. 2 sealing rod, the collecting block is connected to the suction gun type helium detector, and the collecting block is also connected to the upper end of the No. 1 sealing rod through the suction gun cylinder.

[0016] As a preferred technical solution of the utility model, the leakage bottle calibration unit includes a calibration cylinder fixedly mounted on a frame and a clamping block fixed on the output end of the calibration cylinder, as well as a helium leakage bottle fixed on the clamping block and having the same number as the lifting cells on the lifting unit, and a stainless steel detection nozzle is also provided on the helium leakage bottle.

[0017] Compared with the prior art, the beneficial effects of the utility model are as follows: in terms of sealing performance testing, helium testing is used to replace traditional gas testing, which can achieve significant improvements in the areas of leak detection efficiency and leak detection precision. Compared with traditional leak detection methods, helium testing has high detection efficiency and leak detection precision that is 3-4 orders of magnitude higher, and will not cause any impact on the battery. The positive pressure bubble leak detection method currently commonly used in the lithium battery industry can easily cause deformation of the battery casing, and has low detection efficiency and detection precision, especially for metal casings and aluminum-plastic film soft-package lithium-ion batteries. Helium mass spectrometry leak detection has obvious advantages in battery leak detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0019] Figure 1 It is a structural schematic diagram of the main view of the utility model;

[0020] Figure 2 It is a schematic diagram of the structure of the utility model from the side;

[0021] Figure 3 It is a structural schematic diagram of the lifting unit in the utility model;

[0022] Figure 4 This is a structural schematic diagram of the lifting unit in the utility model;

[0023] Figure 5 It is a structural schematic diagram of the clamping unit in the utility model;

[0024] Figure 6 It is a structural schematic diagram of the plugging unit in the utility model;

[0025] Figure 7 This is a structural schematic diagram of the leaking bottle calibration unit in the utility model;

[0026] In the figure: 1. frame; 2. suction gun type helium detector; 3. lifting unit; 31. connecting seat; 32. electric cylinder; 33. push rod; 34. guide sleeve; 4. lifting unit; 41. support; 42. Y-axis cylinder; 43. sliding seat; 44. hydraulic buffer; 5. clamping unit; 51. connecting plate; 52. driving rod; 53. inclined groove; 54. clamping claw; 6. blocking unit; 61. No. 1 sealing rod; 62. No. 2 sealing rod; 63. collecting block; 64. suction gun cylinder; 65. filter; 66. flow suppressor; 67. cover nut; 7. leakage bottle calibration unit; 71. calibration cylinder; 72. clamping block; 73. helium leakage bottle; 74. stainless steel detection nozzle; 8. lifting cylinder; 9. X-axis cylinder. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. Example

[0028] See also Figure 1-7The utility model provides the following technical solutions: a lithium battery cell leak detection device, comprising a frame 1 and a suction gun type helium detector 2 for detecting the cell, the suction gun type helium detector 2 is installed on one side of the frame 1, the suction gun type helium detector 2 has a front pump that is started first, and the molecular pump is started after a certain vacuum degree is reached, so that the flow rate can be changed by switching the solenoid valve to switch the detection accuracy, the leak detection port is equipped with a precision filtering device, which can effectively prevent debris particles or copper powder from entering the instrument, the mechanics and the circuit are effectively separated, and the interference of temperature, electromagnetic field, etc. is avoided, so that the leak detector runs more stably and reliably. A lifting unit 3 for lifting the battery cells from the track is installed on the frame 1. The lifting unit 3 lifts multiple battery cells upward. The frame 1 also includes a clamping unit 5 located in the frame 1. The clamping unit 5 can clamp multiple battery cells lifted by the lifting unit 3 at the same time. A lifting unit 4 is installed in the frame 1. The clamping unit 5 is installed on the lifting unit 4, and the clamping unit 5 moves up and down inside the frame 1 through the lifting unit 4. A plurality of groups of plugging units 6 with the same number of battery cells lifted by the lifting unit 3 are installed on the frame 1. The plugging units 6 are connected to the suction gun type helium detector 2 to perform helium detection on the battery cells clamped by the clamping unit 5. A leakage bottle calibration unit 7 is also installed on the frame 1. The battery cells on the lifting unit 3 are calibrated by the leakage bottle calibration unit 7. A lifting cylinder 8 for driving the sealing unit 6 to lift is installed on the frame 1, and an X-axis cylinder 9 for driving the clamping unit 5 to clamp the battery cell is installed on the lifting unit 4. In this embodiment, the battery cell is lifted by the lifting unit 3, and the X-axis cylinder 9 drives the clamping unit 5 to clamp the battery cell. The lifting cylinder 8 drives the sealing unit 6 to enter the detection position and connects to the suction gun type helium detector 2. The suction gun type helium detector 2 detects the battery cell, and the vacuum pump in the suction gun type helium detector 2 starts to evacuate. After the vacuum degree reaches the set value, the helium detector performs helium detection and value taking. The large leak helium detection is mainly to detect the large leak battery cell in advance to prevent it from entering the next process of small leak detection to absorb the electrolyte, causing pollution to the small leak chamber, thereby causing a significant impact on the production efficiency of the helium detection of the production line.

[0029] Specifically, the lifting unit 3 includes a connecting seat 31 fixedly mounted on the frame 1, an electric cylinder 32 fixedly mounted at the lower end of the connecting seat 31, and a push rod 33 fixed at the output end of the electric cylinder 32. The push rod 33 is provided with a support plate for lifting the battery cell on the track. A guide sleeve 34 is fixed on the connecting seat 31. The push rod 33 slides through the guide sleeve 34. In this embodiment, the lifting unit 3 lifts and lowers the battery cell through PLC program instructions.

[0030] Specifically, the lifting unit 4 includes a support 41 fixed on the frame 1, a Y-axis cylinder 42 fixed on the upper end of the support 41, and a sliding seat 43 slidably arranged on one side of the support 41. The support 41 and the sliding seat 43 are connected by a linear slide rail, and the support 41 is provided with a hydraulic buffer 44 located at the bottom of the linear slide rail. The clamping unit 5 is installed on the sliding seat 43. In this embodiment, the sliding seat 43 is positioned by a positioning bolt. The lifting unit 4 is mainly for providing an installation position for the clamping unit 5, and at the same time solves the problem of avoiding interference when the battery cell is moved in, thereby ensuring the mutual coordination of detection and transportation work.

[0031] Specifically, the clamping unit 5 includes a connecting plate 51 that slides horizontally on the sliding seat 43 and a driving rod 52 fixed on the output end of the X-axis cylinder 9, as well as an inclined groove 53 fixed on the connecting plate 51 and a clamping claw 54 arranged on the connecting plate 51. A horizontal linear slide rail is arranged between the connecting plate 51 and the sliding seat 43. The clamping unit 5 also includes a clamping plate fixed on the sliding seat 43 and cooperating with the clamping claw 54 to clamp the battery cell. In this embodiment, the clamping unit 5 is driven by the X-axis cylinder 9 to drive the driving rod 52 to cooperate with the inclined groove 53, so as to clamp the battery cell in the clamping claw 54. The position of this clamping unit is adjusted by a positioning bolt to avoid clamping too tight or too loose. This unit provides stable positioning for the sealing of the sealing rod plug, thereby ensuring small fluctuations in the detection data.

[0032] Specifically, the blocking unit 6 includes a No. 1 sealing rod 61 fixed to the output end of the lifting cylinder 8 and a No. 2 sealing rod 62 fixed to the lower end of the No. 1 sealing rod 61, a current collecting block 63 arranged at the upper end of the No. 1 sealing rod 61 through a bracket and a suction gun cylinder 64 fixed to the upper end of the bracket. A filter 65, a current suppressor 66, and a cover nut 67 are also arranged between the No. 1 sealing rod 61 and the No. 2 sealing rod 62. A plug is provided on the No. 2 sealing rod 62. The current collecting block 63 is connected to the suction gun type helium detector 2. The current collecting block 63 is also arranged through the suction gun cylinder 64 is butted with the upper end of the No. 1 sealing rod 61. In this embodiment, the collector block 63 is connected to the suction gun type helium detector 2 through an air pipe. The electrons emitted by the filament in the mass spectrometer chamber of the suction gun type helium detector 2 oscillate back and forth in the room, and collide with the indoor gas and the helium entering the room through the leak hole to ionize them into positive ions. These helium ions enter the magnetic field under the action of the accelerating electric field, and are deflected due to the Lorentz force to form an arc-shaped orbit. Changing the acceleration voltage can make ions of different masses pass through the magnetic field and the receiving slit to reach the receiving electrode and be detected.

[0033] Specifically, the leakage bottle calibration unit 7 includes a calibration cylinder 71 fixedly mounted on the frame 1, a clamping block 72 fixed at the output end of the calibration cylinder 71, and a helium leakage bottle 73 fixed on the clamping block 72 and having the same number as the lifting cells on the lifting unit 3. A stainless steel detection nozzle 74 is also provided on the helium leakage bottle 73. In this embodiment, the leakage bottle calibration unit 7 extends when calibration is required and retracts when calibration is not required. The stainless steel detection nozzle 74 can be connected to the plug in the sealing unit 6 accordingly.

[0034] Working principle and use process of the utility model: the plugging unit 6 of the utility model is set in two groups, the suction gun type helium detector 2 is also two corresponding to the two groups of plugging units 6, the lifting unit 3 lifts two battery cells, and the two groups of suction gun type helium detectors 2 and the plugging unit 6 respectively detect the two battery cells, the helium leak bottle 73 and the stainless steel detection nozzle 74 in the leak bottle calibration unit 7 are also set in two groups, corresponding to the two battery cells, and the clamping unit 5 is also provided with a station for clamping the two battery cells respectively;

[0035] The lifting unit 3, the lifting unit 4 and two sets of blocking units 6 are all installed on the frame 1, the lifting unit 4;

[0036] The battery cell is transported to the support plate at the upper end of the push rod 33, the electric cylinder 32 drives the push rod 33 and the battery cell to move upward, the Y-axis cylinder 42 drives the sliding seat 43 to move downward, the sliding seat 43 drives the clamping unit 5 to move downward synchronously, the clamping claws 54 are located on both sides of the battery cell, the output of the X-axis cylinder 9 drives the clamping claws 54 to move horizontally through the cooperation of the driving rod 52 and the inclined groove 53 to clamp the battery cell, the lifting cylinder 8 drives the lower end plug of the No. 2 sealing rod 62 to dock with the battery cell, the suction gun cylinder 64 drives the collector block 63 to dock with the upper end of the No. 1 sealing rod 61, and the suction gun type helium detector 2 connected through the collector block 63 is Perform helium inspection. When some battery cells do not meet the standards, the calibration cylinder 71 drives the helium leak bottle 73 to extend for calibration. When no calibration is required, the calibration cylinder 71 drives the helium leak bottle 73 to retract. After the inspection is completed, the suction gun cylinder 64 resets upward, and the lifting cylinder 8 drives the blocking unit 6 to reset upward. The lifting cylinder 8 resets the clamping unit 5 to release the clamping of the battery cell. The Y-axis cylinder 42 drives the sliding seat 43 and the clamping unit 5 to move upward, and the lifting unit 3 drives the battery cell to move downward. The battery cell that has been inspected is sent out, and the battery cell that needs to be inspected continues to be sent in. Repeat the above steps for continuous work.

[0037] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A lithium battery cell major leakage detection device, comprising a frame (1) and a sniffer-type helium detector (2) for detecting the battery cell, wherein the sniffer-type helium detector (2) is installed on one side of the frame (1), and is characterized in that: The frame (1) is provided with a lifting unit (3) for lifting the battery cells upward from the track, the lifting unit (3) lifting a plurality of battery cells upward, and further comprising a clamping unit (5) located in the frame (1), the clamping unit (5) being capable of simultaneously clamping the plurality of battery cells lifted by the lifting unit (3), the frame (1) being provided with a lifting unit (4), the clamping unit (5) being installed on the lifting unit (4), and the clamping unit (5) being movable up and down inside the frame (1) via the lifting unit (4), and the frame (1) being provided with a lifting unit (4) for lifting the battery cells upward. A plurality of groups of plugging units (6) having the same number as the lifted cells on the lifting unit (3) are installed. The plugging units (6) are connected to a suction gun type helium detector (2) to perform helium detection on the cells clamped by the clamping unit (5). A leak bottle calibration unit (7) is also installed on the frame (1). The cells on the lifting unit (3) are calibrated by the leak bottle calibration unit (7). A lifting cylinder (8) for driving the plugging unit (6) to lift is installed on the frame (1). An X-axis cylinder (9) for driving the clamping unit (5) to clamp the cells is installed on the lifting unit (4).

2. A lithium battery cell major leakage detection device according to claim 1, characterized in that: The lifting unit (3) comprises a connecting seat (31) fixedly mounted on the frame (1), an electric cylinder (32) fixedly mounted on the lower end of the connecting seat (31), and a push rod (33) fixed on the output end of the electric cylinder (32), wherein a support plate for lifting the battery cell on the track is provided on the push rod (33).

3. A lithium battery cell major leakage detection device according to claim 2, characterized in that: A guide sleeve (34) is fixed on the connecting seat (31), and the push rod (33) penetrates and slides in the guide sleeve (34).

4. A lithium battery cell major leakage detection device according to claim 1, characterized in that: The lifting unit (4) comprises a support (41) fixed on the frame (1), a Y-axis cylinder (42) fixed on the upper end of the support (41), and a sliding seat (43) slidably arranged on one side of the support (41).

5. A lithium battery cell major leakage detection device according to claim 4, characterized in that: The support (41) and the sliding seat (43) are connected via a linear slide rail, and a hydraulic buffer (44) located at the bottom of the linear slide rail is provided on the support (41), and the clamping unit (5) is mounted on the sliding seat (43).

6. A lithium battery cell major leakage detection device according to claim 5, characterized in that: The clamping unit (5) comprises a connecting plate (51) sliding horizontally on a sliding seat (43), a driving rod (52) fixed to an output end of an X-axis cylinder (9), an inclined groove (53) fixed to the connecting plate (51), and a clamping claw (54) arranged on the connecting plate (51).

7. A lithium battery cell major leakage detection device according to claim 6, characterized in that: A horizontal linear slide rail is provided between the connecting plate (51) and the sliding seat (43), and the clamping unit (5) further comprises a clamping plate fixed on the sliding seat (43) and cooperating with the clamping claw (54) to clamp the battery core.

8. A lithium battery cell major leakage detection device according to claim 1, characterized in that: The blocking unit (6) comprises a No. 1 sealing rod (61) fixed to the output end of the lifting cylinder (8) and a No. 2 sealing rod (62) fixed to the lower end of the No. 1 sealing rod (61), a current collecting block (63) arranged at the upper end of the No. 1 sealing rod (61) via a bracket and a gun suction cylinder (64) fixed to the upper end of the bracket, and a filter (65), a flow suppressor (66), and a cover nut (67) are also arranged between the No. 1 sealing rod (61) and the No. 2 sealing rod (62).

9. A lithium battery cell major leakage detection device according to claim 8, characterized in that: The second sealing rod (62) is provided with a plug, the current collecting block (63) is connected to the suction gun type helium detector (2), and the current collecting block (63) is also connected to the upper end of the first sealing rod (61) through the suction gun cylinder (64).

10. A lithium battery cell major leakage detection device according to claim 1, characterized in that: The leak bottle calibration unit (7) comprises a calibration cylinder (71) fixedly mounted on a frame (1), a clamping block (72) fixed to an output end of the calibration cylinder (71), and helium leak bottles (73) fixed to the clamping block (72) and having the same number of lift cells as the lift unit (3). The helium leak bottles (73) are also provided with stainless steel detection nozzles (74).

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