Battery cell assembly sealing detection device

Abstract

The present invention relates to a battery cell assembly sealing detection device, comprising a top sealer, a conveying assembly arranged at the side of the top sealer for conveying the battery cells that have been side-sealed by the side sealer, and a detection assembly arranged at the side of the top sealer for detecting the battery cells in the conveying assembly, and the present invention relates to the battery cell assembly packaging technology field. The battery cell assembly sealing detection device, after forming a sealing structure, inputs air through an air inlet nozzle until a pressure detection sensor on the air inlet nozzle detects that the pressure inside the battery cell reaches 100kPa, and detects through an air pressure detection assembly in the air inlet nozzle, automatically squeezes during inflation to prevent deformation, and automatically releases the limit when not inflated to prevent deformation of the battery cell caused by external squeezing, and can quickly perform air tightness detection on the battery cell assembly after the side sealer seals, and determine whether there is a leak, which can prevent electrolyte leakage due to inadequate side sealing during the subsequent electrolyte infusion process.

Description

Technical Field

[0001] The invention relates to the technical field of battery core assembly packaging, and in particular to a battery core assembly sealing detection device. Background Art

[0002] Before electrolyte injection, the battery cells need to be packaged and sealed first to facilitate the subsequent electrolyte filling. The existing packaging and sealing is either done manually or by single-sided packaging and sealing under multi-station conditions, which is inefficient and complicated, and multiple positioning makes it difficult to ensure the tightness of the packaging and the sealing effect. In the subsequent electrolyte injection process, electrolyte leakage is likely to occur due to inadequate side sealing. The existing packaging equipment does not have good detection methods, resulting in uneven quality of the finished battery cells produced and the quality cannot be ensured. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides a battery core assembly sealing detection device to solve the above-mentioned problems.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solutions: a cell assembly sealing detection device, comprising a top sealing machine, a conveying assembly arranged at the side of the top sealing machine for conveying the cell that has been side-sealed by the side sealing machine, and a detection assembly arranged at the side of the top sealing machine for detecting the cell in the conveying assembly, the conveying assembly comprising a placement rack for placing the cell, both sides of the inner cavity of the placement rack are fixedly connected with support nets abutting against the two sides of the cell, the two support nets are connected by a support spring, and both sides of the placement rack are respectively fixedly connected with two lower limit blocks abutting against the sides of the support net;

[0005] The detection component includes a pressing head arranged above the placement frame and driven by a hydraulic mechanism, the inner cavity of the pressing head is slidably connected to two chucks driven by a double-rod cylinder, the bottom of the pressing head is respectively connected to an air suction nozzle and an air inlet nozzle penetrating the chuck, the inner cavity of the chuck is respectively provided with inner grooves adapted to the air suction nozzle and the air inlet nozzle, and the side of the pressing head is fixedly connected to a pressing block;

[0006] The inner cavity of the placement rack is provided with a movable groove located below the lower pressure block, the inner cavity of the movable groove is fixedly connected with a fixed plate, the inner cavity of the fixed plate is slidably connected with a push rod, the bottom of the push rod is fixedly connected with an upper limit block, and a return spring is sleeved on the surface of the push rod located in the inner cavity of the movable groove, the top end of the return spring is fixedly connected to the bottom of the fixed plate, the bottom end of the return spring is fixedly connected to the top of the upper limit block, and an inclined surface is provided at the contact between the upper limit block and the battery cell.

[0007] As a further solution of the present invention: a sealing gasket is fixedly connected between the two clamps, and the surface of the battery cell is clamped by the flexible sealing gasket, which can ensure the sealing effect and prevent the battery cell from being damaged by clamping.

[0008] As a further solution of the present invention: there are four movable grooves, which are respectively arranged around the placement rack. The surface of the lower pressing block is adapted to the inner cavity of the movable groove. The setting of the four upper limit blocks can effectively limit the support net so that it can be wrapped around the surface of the battery cell.

[0009] As a further solution of the present invention: the side of the lower pressure head is fixedly connected with a rotating cylinder, and one end of the rotating cylinder piston rod is fixedly connected with a negative pressure plate through a connecting rod. The negative pressure plate is connected to the negative pressure pump through a negative pressure pipe. When pressing down in use, the negative pressure plate is first driven to rotate by the rotating cylinders on both sides and clamped to the surface of the battery core. Then the negative pressure pump outputs negative pressure to the negative pressure plate through the negative pressure pipe to adsorb the aluminum-plastic film on both sides of the battery core. Then the rotating cylinder drives the negative pressure plate to open, driving the aluminum-plastic film to open. At this time, the lower pressure head is pressed down. When pressing down, the lower pressure block first drops and squeezes the push rod. The push rod pulls the reset spring in the movable groove to move downward, driving the upper limit block to move downward, squeezing the surface of the support net. The two support nets squeeze the reset spring toward the middle to move, supporting both sides of the battery core to prevent the aluminum from being inflated due to the increase in internal air pressure during inflation. The plastic film undergoes drastic deformation to maintain the overall shape of the battery cell. When inflation is not required, the lower pressure head rises, and the upper limit block is reset at this time, the support net loses its extrusion on the battery cell. It automatically squeezes during inflation to prevent deformation. After not inflating, the limit is automatically released to prevent external extrusion from causing deformation of the battery cell. The exhaust nozzle and the air inlet nozzle both extend to the inner cavity of the battery cell, and then the chuck clamps both sides of the aluminum-plastic film to form a relatively sealed structure. The air inlet nozzle then inputs a certain amount of air, which is detected by the air pressure detection component in the air inlet nozzle. After standing for thirty seconds, if there is no change in the air pressure, it indicates sealing. When a change in the air pressure is detected, it indicates leakage. When the air pressure is detected to be unchanged, a certain amount of air is extracted through the exhaust nozzle to ensure the original state of the battery cell. After the detection is completed, the placement rack is moved to the top sealing machine for electrolyte perfusion and then sealing.

[0010] As a further solution of the present invention: the placement rack is composed of two rectangular hollow frames, and a placement slot for placing the battery cells is provided in the middle.

[0011] As a further solution of the present invention: when the reset spring is in a normal state, the upper limit block is located above the support net. At this time, the support net is in an open state, and the battery cell can be easily placed in and positioned.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. In the present invention, after the sealing structure is formed, the air inlet nozzle inputs air until the pressure detection sensor on the air inlet nozzle detects that the pressure inside the battery cell reaches 100kPa, and the air pressure detection component in the air inlet nozzle is used for detection, and the changes in the pressure gauge of the air pressure detection component are observed, and any pressure drop data is recorded. If the pressure drop exceeds the set threshold value (0.1kPa / min), it is judged as unqualified, indicating leakage. When the air pressure does not change, it indicates sealing. It automatically squeezes during inflation to prevent deformation. After not inflating, it automatically releases the limit to prevent external squeezing from causing deformation of the battery cell. The battery cell assembly after the side sealing machine is sealed can be quickly tested for air tightness to determine whether there is a leak, which can prevent electrolyte leakage due to inadequate side sealing during subsequent electrolyte perfusion.

[0014] 2. In the present invention, when pressing down, the negative pressure plate is first driven to rotate by the rotating cylinders on both sides and clamped to the surface of the battery core. Then the negative pressure pump outputs negative pressure to the negative pressure plate through the negative pressure pipeline to adsorb the aluminum-plastic film on both sides of the battery core. Then the rotating cylinder drives the negative pressure plate to open, driving the aluminum-plastic film to open.

[0015] 3. In the present invention, both the vacuum nozzle and the air inlet nozzle extend to the inner cavity of the battery cell, and then the chuck clamps the two sides of the aluminum-plastic film to form a relatively sealed structure. Then the air inlet nozzle inputs a certain amount of air, and the air pressure is detected by the air pressure detection component in the air inlet nozzle. After standing for thirty seconds, if the air pressure does not change, it indicates sealing. When a change in air pressure is detected, it indicates leakage. When the air pressure is detected to be unchanged, a certain amount of air is extracted through the vacuum nozzle to ensure the original state of the inside of the battery cell. After the detection is completed, the placement rack is moved to the top sealing machine to inject the electrolyte and then seal it. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the present invention;

[0017] Figure 2 It is a structural schematic diagram of the detection state of the present invention;

[0018] Figure 3 It is a structural schematic diagram of the pressing head and the placing frame of the present invention;

[0019] Figure 4 For the present invention Figure 1 A partial enlarged view of the middle A;

[0020] Figure 5 For the present invention Figure 2 A partial enlarged view of point B in the middle;

[0021] Figure 6 It is a structural side view of the placement rack of the present invention;

[0022] Figure 7 It is a top view of the structure of the chuck of the present invention.

[0023] In the figure: 1. Top sealing machine; 2. Lower pressure head; 3. Placement rack; 4. Support net; 5. Lower limit block; 6. Support spring; 7. Chuck; 8. Vacuum nozzle; 9. Inlet nozzle; 10. Sealing pad; 11. Rotating cylinder; 12. Negative pressure plate; 13. Negative pressure pipeline; 14. Lower pressure block; 15. Push rod; 16. Fixed plate; 17. Movable groove; 18. Reset spring; 19. Upper limit block. DETAILED DESCRIPTION

[0024] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation mode, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0025] See also Figure 1-7 The present invention provides a technical solution: a cell assembly sealing detection device, comprising a top sealing machine 1, a conveying assembly arranged at the side of the top sealing machine 1 for conveying the cell sealed by the side sealing machine, and a detection assembly arranged at the side of the top sealing machine 1 for detecting the cell in the conveying assembly, the conveying assembly comprising a placement rack 3 for placing the cell, both sides of the inner cavity of the placement rack 3 are fixedly connected with support nets 4 abutting against the two sides of the cell, the two support nets 4 are connected by support springs 6, and both sides of the placement rack 3 are fixedly connected with two lower limit blocks 5 abutting against the sides of the support net 4;

[0026] The detection component includes a pressing head 2 arranged above the placing frame 3 and driven by a hydraulic mechanism, the inner cavity of the pressing head 2 is slidably connected to two chucks 7 driven by a double-rod cylinder, the bottom of the pressing head 2 is respectively connected to an air suction nozzle 8 and an air inlet nozzle 9 penetrating the chuck 7, the inner cavity of the chuck 7 is respectively provided with inner grooves adapted to the air suction nozzle 8 and the air inlet nozzle 9, and the side of the pressing head 2 is fixedly connected to a pressing block 14;

[0027] The inner cavity of the placement rack 3 is provided with a movable groove 17 located below the lower pressure block 14, the inner cavity of the movable groove 17 is fixedly connected with a fixed plate 16, the inner cavity of the fixed plate 16 is slidably connected with a push rod 15, the bottom of the push rod 15 is fixedly connected with an upper limit block 19, and the surface of the push rod 15 located in the inner cavity of the movable groove 17 is sleeved with a return spring 18, the top end of the return spring 18 is fixedly connected to the bottom of the fixed plate 16, the bottom end of the return spring 18 is fixedly connected to the top of the upper limit block 19, and an inclined surface is provided at the contact between the upper limit block 19 and the battery cell.

[0028] A sealing pad 10 is fixedly connected between the two clamps 7. The flexible sealing pad 10 clamps the surface of the battery cell, which can ensure the sealing effect and prevent the battery cell from being damaged due to clamping.

[0029] There are four movable grooves 17, which are respectively arranged around the placement rack 3. The surface of the lower pressing block 14 is adapted to the inner cavity of the movable groove 17. The arrangement of the four upper limit blocks 19 can effectively limit the support net 4 so that it can wrap around the surface of the battery cell.

[0030] The side of the pressure head 2 is fixedly connected with a rotating cylinder 11, and one end of the piston rod of the rotating cylinder 11 is fixedly connected with a negative pressure plate 12 through a connecting rod. The negative pressure plate 12 is connected to the negative pressure pump through a negative pressure pipe 13. When pressing down during use, the negative pressure plate 12 is first driven to rotate by the rotating cylinders 11 on both sides to clamp it to the surface of the battery cell, and then the negative pressure pump outputs negative pressure to the negative pressure plate 12 through the negative pressure pipe 13 to adsorb the aluminum-plastic film on both sides of the battery cell, and then the rotating cylinder 11 drives the negative pressure plate 12 to open, driving the aluminum-plastic film to expand. When the pressure head 2 is opened, the pressure block 14 is pressed down first, and the push rod 15 is squeezed. The push rod 15 pulls the return spring 18 in the movable groove 17 to move downward, driving the upper limit block 19 to move downward, squeezing the surface of the support net 4. The two support nets 4 squeeze the return spring 18 toward the middle to support the two sides of the battery cell to prevent the aluminum-plastic film from being drastically deformed due to the increase of internal air pressure during inflation, and maintain the overall shape of the battery cell unchanged. When inflation is not needed, the pressure head 2 rises. When the pressure drops, the upper limit block 19 is reset, and the support net 4 loses the squeeze on the battery core. It is automatically squeezed during inflation to prevent deformation. After not inflating, the limit is automatically released to prevent the battery core from being deformed due to external squeezing. The suction nozzle 8 and the air inlet nozzle 9 are extended to the inner cavity of the battery core, and then the chuck 7 clamps the two sides of the aluminum-plastic film to form a relatively sealed structure. Then the air inlet nozzle 9 inputs air until the pressure detection sensor on the air inlet nozzle 9 detects that the pressure reaches 100kPa. While maintaining the inflation state, the air pressure detection component in the air inlet nozzle 9 is detected, and the changes in the pressure gauge of the air pressure detection component are observed, and any pressure drop data is recorded. If the pressure drop exceeds the set threshold value (0.1kPa / min), it is judged as unqualified, indicating leakage. When the air pressure does not change, it indicates sealing. When the air pressure is detected to be unchanged, the gas is slowly extracted through the suction nozzle 8 to return the pressure in the chamber to the atmospheric pressure level to ensure the original state inside the battery core. After the detection is completed, the placement rack 3 is moved to the top sealing machine for electrolyte perfusion and then sealed.

[0031] The placement rack 3 is composed of two rectangular hollow frames, and a placement slot for placing the battery cells is provided in the middle.

[0032] When the reset spring 18 is in a normal state, the upper limit block 19 is located above the support net 4. At this time, the upper part of the support net 4 is in an open state, and the battery cell can be conveniently placed therein for positioning.

[0033] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A cell assembly sealing detection device, comprising a top sealing machine (1), a conveying assembly arranged at the side of the top sealing machine (1) for conveying cells that have been side-sealed by the side sealing machine, and a detection assembly arranged at the side of the top sealing machine (1) for detecting cells in the conveying assembly, characterized in that: The conveying assembly comprises a placement rack (3) for placing the battery cells, both sides of the inner cavity of the placement rack (3) are fixedly connected with support nets (4) abutting against the two sides of the battery cells, the two support nets (4) are connected via a support spring (6), and both sides of the placement rack (3) are respectively fixedly connected with two lower limit blocks (5) abutting against the side edges of the support nets (4); The detection component comprises a lower pressure head (2) arranged above the placement frame (3) and driven by a hydraulic mechanism, the inner cavity of the lower pressure head (2) is slidably connected to two chucks (7) driven by a double-rod cylinder, the bottom of the lower pressure head (2) is respectively connected to an air suction nozzle (8) and an air inlet nozzle (9) penetrating the chuck (7), the inner cavity of the chuck (7) is respectively provided with inner grooves adapted to the air suction nozzle (8) and the air inlet nozzle (9), and the side of the lower pressure head (2) is fixedly connected to a lower pressure block (14); The inner cavity of the placement rack (3) is provided with a movable groove (17) located below the lower pressing block (14); the inner cavity of the movable groove (17) is fixedly connected to a fixed plate (16); the inner cavity of the fixed plate (16) is slidably connected to a push rod (15); the bottom of the push rod (15) is fixedly connected to an upper limit block (19); a return spring (18) is sleeved on the surface of the push rod (15) located in the inner cavity of the movable groove (17); the top end of the return spring (18) is fixedly connected to the bottom of the fixed plate (16); the bottom end of the return spring (18) is fixedly connected to the top of the upper limit block (19); and an inclined surface is provided at the abutment between the upper limit block (19) and the battery cell.

2. The battery core assembly sealing detection device according to claim 1, characterized in that: A sealing gasket (10) is fixedly connected between the two clamps (7).

3. The battery core assembly sealing detection device according to claim 1, characterized in that: There are four movable grooves (17) arranged respectively around the placement rack (3), and the surface of the lower pressing block (14) is adapted to the inner cavity of the movable groove (17).

4. The battery core assembly sealing detection device according to claim 1, characterized in that: The side of the lower pressure head (2) is fixedly connected to a rotating cylinder (11), one end of the piston rod of the rotating cylinder (11) is fixedly connected to a negative pressure plate (12) via a connecting rod, and the negative pressure plate (12) is connected to a negative pressure pump via a negative pressure pipeline (13).

5. The battery core assembly sealing detection device according to claim 1, characterized in that: The placement rack (3) is composed of two rectangular hollow frames, with a placement slot in the middle for placing the battery cells.

6. The battery core assembly sealing detection device according to claim 1, characterized in that: When the return spring (18) is in a normal state, the upper limit block (19) is located above the support net (4).

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