A vacuum sealing device, a sealing method and its application in cylindrical battery production

Abstract

The present invention relates to the technical field of lithium battery production, and in particular to a vacuum sealing device, a sealing method and an application in cylindrical battery production, wherein the vacuum sealing device comprises a frame, the frame comprises a lower machine base and an upper machine base, a positioning device is provided on the top of the lower machine base, and a pressing assembly is provided above the positioning device; a vacuum generating device is provided on the top of the upper machine base, the vacuum generating device comprises a vacuum generator, an exhaust pipe is provided on the outer side of the vacuum generator, the exhaust pipe is connected with the interior of the upper machine base, and an exhaust pipe is provided on the outer side of the vacuum generator; a feed port is provided on the outer side of the upper machine base, and a sealing flap is provided on the outer side of the feed port; the present invention arranges a vacuum generating device, and performs a vacuum operation on the upper machine base through the exhaust pipe. During the vacuuming process of the exhaust pipe, the gas remaining in the unsealed cylindrical lithium battery is extracted to avoid the gas remaining in the core structure, thereby improving the safety of the cylindrical lithium battery when in use.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery production, and in particular to a vacuum sealing device, a sealing method and applications in cylindrical battery production. Background Art

[0002] Cylindrical lithium batteries are widely used in electric vehicles, energy storage systems, portable electronic devices and other fields due to their advantages such as good standardization, mature technology, high degree of automation, strong product consistency and low cost.

[0003] Cylindrical lithium batteries are mainly composed of steel shell structure, winding core structure and cap structure. In the process of cylindrical battery assembly, after completing the winding core shell, steel shell groove rolling, cap welding and steel shell liquid injection, the steel shell and cap need to be sealed. Currently, most of the equipment used for steel shell sealing adopts the stamping principle. After the battery is fixed with a clamp, the cap structure is pressed into the end of the cylindrical battery steel shell through a stamping die to complete the packaging of the cylindrical battery.

[0004] The Chinese patent with application number CN202110042249.9 discloses a cylindrical lithium battery capping packaging system, including a base, a first electric oil cylinder, a capping frame and a pressing roller, the bottom of the base is symmetrically rotatably connected with two groups of conveying rollers, the two groups of conveying rollers are connected by a conveyor belt, and multiple groups of inserts are equidistantly installed on the outside of the conveyor belt, and the rear end of the base is fixedly connected with a top frame. This scheme adopts a fully automatic processing structure, which can realize the automatic conveying, capping and rolling packaging operations of cylindrical lithium batteries, improves the efficiency and convenience of cylindrical lithium battery capping packaging processing, so as to meet the actual processing and use of cylindrical lithium batteries. Secondly, a magnetic inner buckle clamping structure is adopted, and the cylindrical lithium battery delivered to the processing station can be clamped before processing, which reduces the occurrence of force offset and shaking during the processing of cylindrical lithium batteries, thereby improving the stability of cylindrical lithium battery processing.

[0005] Although the existing technology improves the stability of the steel shell during the steel shell sealing process, the normal pressure sealing method will cause a certain amount of gas to remain inside the core structure, reducing the internal pressure boost range of the cylindrical lithium battery. When the current flowing between the two poles of the cylindrical battery exceeds a certain limit, part of the electrolyte decomposes, causing excessive pressure inside the battery, causing the cylindrical battery to explode, posing a safety hazard, and even causing a safety accident.

[0006] When the steel shell is sealed by a stamping die, the two steps of fixing the steel shell head in the die cavity of the stamping die and calendering deformation are carried out almost simultaneously, with no delay in between. After the steel shell is sealed, it is very easy to cause the outer diameter of the steel shell head to bulge, or wrinkles to form at the seams of the steel shell or the thinner parts of the side walls, affecting the sealing of the steel shell.

[0007] Therefore, it is necessary to invent a vacuum sealing device, a sealing method and applications in cylindrical battery production to solve the above problems. Summary of the invention

[0008] The object of the present invention is to provide a vacuum sealing device, a sealing method and applications in the production of cylindrical batteries to solve the technical problems raised in the above-mentioned background technology.

[0009] To achieve the above object, the present invention provides the following technical solutions:

[0010] A vacuum sealing device, which is used for the production of cylindrical lithium batteries, comprises a frame, which comprises a lower frame and an upper frame, a positioning device is provided on the top of the lower frame, and the positioning device is used to position and clamp the cylindrical lithium battery, and a pressing assembly is provided above the positioning device, and the pressing assembly is connected to the inner top of the upper frame, and the pressing assembly is connected to the upper frame, and the pressing assembly is used to seal the cylindrical lithium battery;

[0011] A vacuum generating device is provided on the top of the upper machine base, and the vacuum generating device includes a vacuum generator, and the vacuum generator is arranged on the top of the upper machine base, and an air extraction pipe is provided on the outer side of the vacuum generator, and the air extraction pipe is connected with the interior of the upper machine base, and an air outlet pipe is provided on the outer side of the vacuum generator, and the air outlet pipe is connected with an external collecting device;

[0012] A feed inlet is provided on the outer side of the upper machine base, and a sealing flap is provided on the outer side of the feed inlet. The sealing flap is rotatably connected to the upper machine base through a rotating member, and the sealing flap blocks the feed inlet.

[0013] Preferably, the positioning device comprises a positioning seat, the positioning seat is fixedly connected to the lower machine base, the positioning seat is provided with positioning grooves distributed in an array, the bottom of the positioning grooves are provided with air suction holes, and the air suction holes are connected to an external air pump;

[0014] The top of the positioning seat is provided with a positioning plate distributed in an array, the positioning plate is provided with positioning holes corresponding to the positioning grooves, the peripheral side of the positioning plate is provided with clamping members distributed in an array, and the clamping members move laterally from the peripheral side of the positioning plate to the positioning holes.

[0015] Preferably, the clamping member includes a clamping block, which moves laterally from the circumferential side of the positioning plate to the positioning hole, and the clamping block is provided with an engaging surface at one end facing the positioning hole, a convex strip is provided in the middle of the engaging surface, and a positioning member is provided in the middle of the clamping block.

[0016] Preferably, the pressing assembly comprises a hydraulic push part, the fixed end of which is fixedly connected to the inner top of the upper machine base, the output end of which is connected to a mounting plate, the bottom of which is provided with positioning sleeves distributed in an array, and the bottom of which is connected to the top of the lower machine base;

[0017] The bottom of the mounting plate is provided with pressing dies distributed in an array, and the positions of the pressing dies correspond to the positions of the positioning grooves.

[0018] Preferably, a mounting frame is provided on the outer side of the pressing die, one end of the mounting frame away from the pressing die is fixedly connected to the bottom of the mounting plate, and an oblique die portion is provided at the bottom of the pressing die;

[0019] A movable groove is provided inside the pressing die, the movable groove is communicated with the oblique die portion, and an adjusting component is provided inside the movable groove.

[0020] Preferably, the adjustment assembly comprises a stepped groove opened in the middle of the movable groove, a rotating seat is provided inside the movable groove, the rotating seat is rotatably connected to the stepped groove, an array of mounting grooves are provided at the bottom of the rotating seat, a movable block is provided inside the mounting groove, the movable block is moved back and forth inside the mounting groove through an electromagnetic member, an adjusting member is provided at the bottom of the movable block, and the adjusting member pulls the cylindrical lithium battery;

[0021] A driving motor is arranged on the top of the pressing mold, a fixed end of the driving motor is fixedly connected to the top of the pressing mold, and an output end of the driving motor penetrates into the interior of the pressing mold and is fixedly connected to the top of the rotating seat.

[0022] Preferably, the adjusting member includes a pushing member, the fixed end of the pushing member is symmetrically arranged at the bottom of the movable block, the telescopic end of the pushing member is fixedly connected to a ball seat, the diameter of the ball seat is larger than the diameter of the telescopic end of the pushing member, and a ball is arranged inside the ball seat.

[0023] Preferably, the electromagnetic component includes a limit rod, the limit rod passes through the movable block and is fixedly connected to both ends of the mounting slot, an elastic member is sleeved on the outer side of the limit rod, one end of the elastic member is connected to the movable block, and the other end of the elastic member is connected to the mounting slot;

[0024] A magnetic block is disposed at the end of the movable block, and an electromagnetic block corresponding to the magnetic block is disposed at the end of the mounting groove.

[0025] A sealing method for a vacuum sealing device, the sealing method comprising the following steps:

[0026] S1. Move the unsealed cylindrical lithium battery to the positioning groove through an external manipulator or a staff member, and then seal the feed port with a sealing flap to seal the interior of the upper base;

[0027] S2, start the clamping member and the vacuum generator, the clamping member positions and clamps the cylindrical lithium battery, the vacuum generator performs a vacuum operation on the upper machine base through the exhaust pipe, and the exhaust pipe extracts the gas remaining in the unsealed cylindrical lithium battery;

[0028] S3, start the hydraulic push part, the hydraulic push part seals the cylindrical lithium battery by pressing the die down, and synchronously detects the working state of the cylindrical lithium battery during the sealing operation, and controls the adjustment component to perform adaptive structural changes according to the specific state of the cylindrical lithium battery.

[0029] Technical effects and advantages of the present invention:

[0030] 1. The present invention sets an air suction hole. After the cylindrical lithium battery enters the positioning groove, the external air pump is controlled to start, the air suction hole adsorbs the cylindrical lithium battery, and at the same time controls the clamping member to clamp and fix the steel shell structure. Under the dual action of the air suction hole and the clamping member, the steel shell structure is always in a perpendicular state to the bottom of the positioning groove during the fixing process, avoiding the steel shell structure itself from tilting, resulting in the down-pressing component being unable to effectively seal the steel shell structure, resulting in poor sealing of the steel shell structure itself.

[0031] 2. The present invention sets a vacuum generating device. After the clamping parts complete the clamping and fixing of the steel shell structure, the vacuum generator is controlled to start. The vacuum generator performs a vacuum operation on the upper machine base through the vacuum pipe. During the vacuuming process of the vacuum pipe, the gas remaining in the unsealed cylindrical lithium battery is extracted to avoid gas remaining in the core structure, thereby improving the safety of the cylindrical lithium battery during use.

[0032] 3. The present invention sets an electromagnetic component and a pushing component, and the ball on the pushing component contacts with the cap structure during the downward movement stage of the pressing die, so as to maintain the stability of the cap structure itself and avoid the sealing of the steel shell structure after sealing being lower than the production requirement; when the pressing die bends the head of the steel shell structure, the ball seat on the pushing component pulls the top of the steel shell structure to avoid bulging on the head of the steel shell structure during the bending operation of the steel shell structure by the pressing die; after the pressing die contacts with the clamping block, the two ball bearings on the pushing component are in compression contact with the bent part of the steel shell structure, and with the rotation of the rotating seat, the ball bearings on the pushing component perform an all-round flattening operation on the bent part of the steel shell structure, thereby improving the sealing of the steel shell structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1It is a schematic diagram of the structure of a cylindrical lithium battery in the prior art;

[0034] Figure 2 It is a schematic diagram of the main structure of the present invention;

[0035] Figure 3 It is a schematic diagram of the internal structure of the frame of the present invention;

[0036] Figure 4 For the present invention Figure 3 A schematic diagram of the enlarged structure at A in the middle;

[0037] Figure 5 It is a structural schematic diagram of the positioning device of the present invention;

[0038] Figure 6 It is a structural schematic diagram of the pressing assembly of the present invention;

[0039] Figure 7 It is a schematic diagram of the structure inside the pressing mold of the present invention;

[0040] Figure 8 It is a structural schematic diagram of the regulating assembly of the present invention;

[0041] Fig. 9 It is a schematic diagram of the structure of the electromagnetic component of the present invention;

[0042] Fig.10 It is a schematic diagram of a first working state of the adjustment component of the present invention;

[0043] Fig.11 It is a schematic diagram of a second working state of the adjustment component of the present invention;

[0044] Fig.12 It is a schematic diagram of the third working state of the adjustment component of the present invention;

[0045] Fig.13 It is a schematic diagram of a fourth working state of the adjustment component of the present invention;

[0046] Fig.14 It is a schematic diagram of the fifth working state of the adjustment component of the present invention.

[0047] In the figure: 1, frame; 101, upper machine base; 102, lower machine base; 2, vacuum generating device; 201, vacuum generator; 202, exhaust pipe; 203, exhaust pipe; 3, sealing flap; 4, positioning device; 401, positioning seat; 402, positioning groove; 403, positioning plate; 404, positioning hole; 405, suction hole; 406, clamping member; 4061, clamping block; 4062, convex strip; 4063, positioning member; 5, pressing assembly; 501, hydraulic pusher; 502, mounting plate; 503, positioning sleeve; 50 4. Mounting frame; 505. Press-down mold; 506. Oblique mold part; 6. Movable groove; 7. Adjustment assembly; 701. Rotating seat; 702. Step groove; 703. Mounting groove; 704. Movable block; 705. Pusher; 706. Ball seat; 707. Ball; 8. Electromagnetic part; 801. Limit rod; 802. Elastic part; 803. Electromagnetic block; 804. Magnetic block; 9. Driving motor; 100. Cylindrical lithium battery; 1001. Steel shell structure; 1002. Winding core structure; 1003. Cap structure; 1004. Rolling groove. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example 1

[0049] Reference Figures 1 to 13 As shown, a vacuum sealing device is used for the production of cylindrical lithium batteries 100, including a frame 1, the frame 1 includes a lower base 102 and an upper base 101, a positioning device 4 is provided on the top of the lower base 102, the positioning device 4 is used to position and clamp the cylindrical lithium battery 100, a pressing assembly 5 is provided above the positioning device 4, the pressing assembly 5 is connected to the inner top of the upper base 101, the pressing assembly 5 is connected to the upper base 101, and the pressing assembly 5 is used to seal the cylindrical lithium battery 100.

[0050] The cylindrical lithium battery 100 includes a steel shell structure 1001, a core structure 1002 is provided inside the steel shell structure 1001, the core structure 1002 is located in the lower middle part of the steel shell structure 1001, a cap structure 1003 is provided at the head of the steel shell structure 1001, and a rolling groove 1004 is provided on the outer side of the steel shell structure 1001, and the rolling groove 1004 is located between the core structure 1002 and the cap structure 1003.

[0051] The positioning device 4 clamps and fixes the outer wall of the steel shell structure 1001 , and the pressing component 5 performs a sealing operation on the head of the steel shell structure 1001 .

[0052] A vacuum generating device 2 is provided on the top of the upper machine base 101, and the vacuum generating device 2 includes a vacuum generator 201. The vacuum generator 201 is arranged on the top of the upper machine base 101, and an exhaust pipe 202 is provided on the outside of the vacuum generator 201. The exhaust pipe 202 is connected to the inside of the upper machine base 101, and an exhaust pipe 203 is provided on the outside of the vacuum generator 201. The exhaust pipe 203 is connected to an external collecting device.

[0053] After the positioning device 4 completes clamping the steel shell structure 1001, the vacuum generator 201 is started. The vacuum generator 201 performs a vacuum operation on the upper base 101 through the exhaust pipe 202. The exhaust pipe 202 extracts the gas remaining in the unsealed cylindrical lithium battery 100 to avoid gas remaining in the core structure 1002, thereby improving the safety of the cylindrical lithium battery 100 during use.

[0054] A feed port is provided on the outer side of the upper machine base 101 , and a sealing flap 3 is provided on the outer side of the feed port. The sealing flap 3 is rotatably connected to the upper machine base 101 through a rotating member, and the sealing flap 3 blocks the feed port.

[0055] An external manipulator is provided on the outside of the frame 1. When in use, the sealing flap 3 is in an open state. The external manipulator moves the unsealed cylindrical lithium battery 100 to the positioning device 4 through the feed port, and the positioning device 4 positions and clamps the cylindrical lithium battery 100. Then the manipulator is withdrawn from the frame 1, and the feed port is sealed by the sealing flap 3, so that the upper machine base 101 is in a sealed state, which is convenient for the vacuum generator 201 to vacuum the upper machine base 101.

[0056] The rotating member is a component that enables the sealing flap 3 to reciprocate on the upper machine base 101 and open and close the feed port. The rotating member belongs to the prior art, so it will not be described in detail.

[0057] Reference Figures 2 to 5 As shown, the positioning device 4 includes a positioning seat 401, which is fixedly connected to the lower machine base 102. The positioning seat 401 is provided with an array of positioning grooves 402, and the bottom of the positioning grooves 402 is provided with suction holes 405, which are connected to an external air pump.

[0058] After the cylindrical lithium battery 100 enters the positioning groove 402 through the external manipulator, the external air pump is controlled to start, and the external air pump is connected to the suction hole 405 through a connecting pipe. After the external air pump is started, the suction hole 405 adsorbs the cylindrical lithium battery 100, so that the bottom of the steel shell structure 1001 contacts the bottom of the suction hole 405, that is, the steel shell structure 1001 and the bottom of the positioning groove 402 are in a mutually perpendicular state.

[0059] The top of the positioning seat 401 is provided with a positioning plate 403 distributed in an array, and the positioning plate 403 is provided with a positioning hole 404 corresponding to the positioning groove 402. The top of the positioning hole 404 is provided with a rounded portion, which facilitates the cylindrical lithium battery 100 to smoothly enter the positioning groove 402. The surrounding side of the positioning plate 403 is provided with a clamping member 406 distributed in an array, and the clamping member 406 moves laterally from the surrounding side of the positioning plate 403 to the positioning hole 404.

[0060] During the process of the suction hole 405 adsorbing the steel shell structure 1001, the clamping member 406 is controlled to move laterally from the circumferential side of the positioning plate 403 to the positioning hole 404, and the clamping member 406 clamps and fixes the steel shell structure 1001. Under the dual action of the suction hole 405 and the clamping member 406, the steel shell structure 1001 is always perpendicular to the bottom of the positioning groove 402 during the fixing process, avoiding the steel shell structure 1001 itself from tilting, resulting in the down-pressing component 5 being unable to effectively seal the steel shell structure 1001, resulting in poor sealing of the steel shell structure 1001 itself.

[0061] Reference Figures 2 to 5 As shown, the clamping member 406 includes a clamping block 4061, which moves laterally from the circumferential side of the positioning plate 403 to the positioning hole 404. The clamping block 4061 is provided with an engaging surface at one end facing the positioning hole 404, a convex strip 4062 is provided in the middle of the engaging surface, and a positioning member 4063 is provided in the middle of the clamping block 4061.

[0062] The clamping block 4061 is detachably connected to the positioning plate 403 . The positioning seat 401 is provided with a driving mechanism for lateral movement, and the clamping block 4061 is detachably connected to the driving mechanism. The driving mechanism drives the clamping block 4061 to move laterally from the peripheral side of the positioning plate 403 to the positioning hole 404 .

[0063] When the clamping block 4061 clamps the cylindrical lithium battery 100, the engaging surface of the clamping block 4061 contacts the outer wall of the steel shell structure 1001, and the convex strip 4062 of the clamping block 4061 engages with the rolling groove 1004 on the steel shell structure 1001, thereby clamping and fixing the cylindrical lithium battery 100.

[0064] Reference Figure 6 and Figure 7As shown, the pressing assembly 5 includes a hydraulic pushing part 501, the fixed end of the hydraulic pushing part 501 is fixedly connected to the inner top of the upper machine base 101, the output end of the hydraulic pushing part 501 is connected to a mounting plate 502, the bottom of the mounting plate 502 is provided with an array-distributed positioning sleeve 503, and the bottom of the positioning sleeve 503 is connected to the top of the lower machine base 102.

[0065] The positioning sleeve 503 includes a fixed part and a movable part. The fixed part is sleeved inside the movable part. The fixed part is fixedly connected to the top of the lower machine base 102, and the movable part is fixedly connected to the top of the mounting plate 502. When the hydraulic pushing part 501 pushes the mounting plate 502 to move up and down, the positioning sleeve 503 limits the displacement of the mounting plate 502 to prevent the mounting plate 502 from tilting during the displacement process, resulting in the inability of the pressing mold 505 to effectively seal the steel shell structure 1001.

[0066] The bottom of the mounting plate 502 is provided with pressing dies 505 distributed in an array, and the position of the pressing dies 505 corresponds to the position of the positioning groove 402 .

[0067] The number of the pressing dies 505 corresponds to the number of the positioning grooves 402 . When the pressing dies 505 move downward, the head of the steel shell structure 1001 is sealed.

[0068] Reference Figures 6 to 9 As shown, a mounting frame 504 is provided on the outer side of the pressing mold 505 , and one end of the mounting frame 504 away from the pressing mold 505 is fixedly connected to the bottom of the mounting plate 502 , and an inclined mold portion 506 is provided at the bottom of the pressing mold 505 .

[0069] The cross-section of the oblique mold part 506 on the pressing mold 505 is conical, the bottom diameter of the oblique mold part 506 is larger than the head diameter of the steel shell structure 1001, and the top of the oblique mold part 506 is smaller than the diameter of the head of the steel shell structure 1001. When the bottom of the pressing mold 505 contacts the top of the clamping block 4061, the top of the oblique mold part 506 contacts the outer shoulder of the cap structure 1003 through the steel shell structure 1001.

[0070] A movable groove 6 is provided inside the pressing mold 505 . The movable groove 6 is communicated with the oblique mold portion 506 . An adjusting component 7 is provided inside the movable groove 6 .

[0071] Reference Figures 7 to 9As shown, the adjustment component 7 includes a stepped groove 702 opened in the middle of the movable groove 6, a rotating seat 701 is provided inside the movable groove 6, the rotating seat 701 is rotatably connected to the stepped groove 702, an array of mounting grooves 703 are provided at the bottom of the rotating seat 701, a movable block 704 is provided inside the mounting groove 703, the movable block 704 is moved back and forth inside the mounting groove 703 through the electromagnetic member 8, and an adjusting member is provided at the bottom of the movable block 704, which pulls the cylindrical lithium battery 100.

[0072] The stepped groove 702 provides a margin for the movement of the movable block 704 so that the adjusting member on the movable block 704 can contact the inner wall of the movable groove 6 .

[0073] The movable block 704 is connected to the installation groove 703 in a limited sliding manner, and the moving distance of the movable block 704 inside the installation groove 703 can be controlled by controlling the magnitude of the current passed into the electromagnetic member 8.

[0074] A driving motor 9 is provided on the top of the pressing mold 505 , and a fixed end of the driving motor 9 is fixedly connected to the top of the pressing mold 505 . An output end of the driving motor 9 penetrates into the interior of the pressing mold 505 and is fixedly connected to the top of the rotating seat 701 .

[0075] The driving motor 9 is controlled to start, and the output end of the driving motor 9 drives the rotating seat 701 to rotate. During the rotation of the rotating seat 701, the adjusting member on the rotating seat 701 rolls the head of the steel shell structure 1001, so that the head of the steel shell structure 1001 completes the sealing operation.

[0076] Reference Figures 1 to 13 As shown, the adjusting member includes a pushing member 705, the fixed end of which is symmetrically arranged at the bottom of the movable block 704, and the telescopic end of the pushing member 705 is fixedly connected to a ball seat 706, the diameter of the ball seat 706 is larger than the diameter of the telescopic end of the pushing member 705, and a ball 707 is arranged inside the ball seat 706.

[0077] The pusher 705 is an electric push rod that can be freely extended and retracted through electrical control. When the pusher 705 is at its maximum extension, the bottom of the ball seat 706 is at a height lower than the bottom of the pressing mold 505. By controlling the pusher 705 to be at different extensions, the pusher 705 can make corresponding adjustments to the different stages of the cylindrical lithium battery 100 through the ball seat 706, ensuring that the pressing mold 505 can smoothly seal the steel shell structure 1001.

[0078] Reference Figures 1 to 13As shown, the electromagnetic component 8 includes a limiting rod 801, which passes through the movable block 704 and is fixedly connected to both ends of the mounting groove 703. An elastic component 802 is sleeved on the outer side of the limiting rod 801, one end of the elastic component 802 is connected to the movable block 704, and the other end of the elastic component 802 is connected to the mounting groove 703.

[0079] The movable block 704 is slidably connected to the limit rod 801. When the electromagnetic component 8 pushes the movable block 704 to move from the middle of the rotating seat 701 to the peripheral side of the rotating seat 701, the movable block 704 compresses the elastic component 802. When the movable block 704 loses the thrust of the electromagnetic component 8, the movable block 704 moves from the peripheral side of the rotating seat 701 to the middle of the rotating seat 701 under the elastic recovery ability of the elastic component 802.

[0080] The elastic member 802 includes a spring, one end of which is connected to the movable block 704 , and the other end of which is fixedly connected to the end of the mounting groove 703 . The spring is sleeved on the outer side of the limiting rod 801 .

[0081] A magnetic block 804 is disposed at the end of the movable block 704 , and an electromagnetic block 803 corresponding to the magnetic block 804 is disposed at the end of the mounting groove 703 .

[0082] The electromagnetic block 803 is arranged in the middle of the rotating seat 701. By passing current into the electromagnetic block 803, a magnetic repulsion force is generated between the electromagnetic block 803 and its corresponding magnetic block 804, and the magnetic block 804 pushes the movable block 704 to move from the middle of the rotating seat 701 to the peripheral side of the rotating seat 701; by controlling the magnitude of the current passed into the electromagnetic block 803, the moving distance of the movable block 704 in the mounting groove 703 can be controlled.

[0083] A control terminal is disposed on the outer side of the upper machine base 101 , and a control system is disposed inside the control terminal. The control system is used to control the movement of all electrical components inside the frame 1 .

[0084] A first pressure sensor is provided at the connection between the pusher 705 and the ball seat 706, and a second pressure sensor is provided at the connection between the elastic member 802 and the mounting groove 703. By detecting the values ​​of the first pressure sensor and the second pressure sensor at different stages, the specific states of the cylindrical lithium battery 100 at different stages can be obtained. By controlling the adjustment component 7 to perform corresponding structural state changes to adapt to the corresponding specific state, the smooth sealing of the steel shell structure 1001 is ensured.

[0085] In the initial state, the electromagnetic block 803 is not powered on, and all the movable holes on the rotating seat 701 are located in the middle area of ​​the rotating seat 701 .

[0086] When in use, the sealing flap 3 is in the open state, and the external manipulator moves the unsealed cylindrical lithium battery 100 to the inside of the positioning groove 402 through the feed port. After the cylindrical lithium battery 100 enters the positioning groove 402, the external manipulator releases the clamping of the cylindrical battery and gradually moves out of the upper machine base 101. After the manipulator moves out of the upper machine base 101, the sealing flap 3 is used to block the feed port so that the upper machine base 101 is in a sealed state, which is convenient for the vacuum generator 201 to vacuum the upper machine base 101.

[0087] After the cylindrical lithium battery 100 enters the positioning groove 402, the external air pump adsorbs the cylindrical lithium battery 100 through the connecting pipe and the suction hole 405, so that the bottom of the steel shell structure 1001 contacts the bottom of the suction hole 405. During the process of the suction hole 405 adsorbing the steel shell structure 1001, the clamping member 406 is controlled to clamp and fix the steel shell structure 1001. Under the dual action of the suction hole 405 and the clamping member 406, the steel shell structure 1001 is always in a mutually perpendicular state with the bottom of the positioning groove 402 during the fixing process, so as to prevent the steel shell structure 1001 from tilting itself, resulting in the inability of the pressing assembly 5 to effectively seal the steel shell structure 1001, resulting in poor sealing of the steel shell structure 1001 itself.

[0088] After the clamping member 406 completes the clamping and fixing of the steel shell structure 1001, the vacuum generator 201 is controlled to start, and the vacuum generator 201 performs a vacuum operation on the upper base 101 through the vacuum pipe 202. During the vacuuming process of the vacuum pipe 202, the gas remaining in the unsealed cylindrical lithium battery 100 is extracted to avoid gas remaining in the core structure 1002, thereby improving the safety of the cylindrical lithium battery 100 during use.

[0089] After the vacuuming is completed, the hydraulic push part 501 is controlled to extend, the hydraulic push part 501 pushes the mounting plate 502 downward, the mounting plate 502 drives the pressing die 505 downward, and the pressing die 505 seals the head of the steel mouth structure.

[0090] During the downward movement of the pressing mold 505, the pusher 705 is extended synchronously, so that the ball 707 at the output end of the pusher 705 first contacts the cap part of the cap structure 1003 (see Fig.10 As shown), at this time, the pressing mold 505 has not yet contacted the head of the steel shell structure 1001. By detecting the value of the first pressure sensor distributed at the connection between the ball seat 706 and the pusher 705, it is determined whether the cap structure 1003 at the head of the steel shell structure 1001 is in a skewed state.

[0091] It should be noted that the cap structure 1003 includes a top cover, an array of air outlets are arranged on the outside of the top cover, a sealing ring is arranged on the outside of the top cover, and an explosion-proof plate is arranged on the bottom of the top cover. The ball 707 on the pusher 705 contacts the top of the top cover during the downward movement of the pressing mold 505.

[0092] When the value of the first pressure sensor at a certain position exceeds the set value, it indicates that the cap structure 1003 at the head of the steel shell structure 1001 is in a skewed state (see Fig.11 As shown), at this time, the deflection direction and deflection angle of the cap structure 1003 are constructed according to the values ​​of the first pressure sensors distributed on the rotating seat 701, and the movable block 704 corresponding to the first pressure sensor with the smallest value is controlled to move to the side of the top cover, and the pusher 705 on the movable block 704 is controlled to pull the cap structure 1003, forcing the cap structure 1003 to restore the flat state. The specific actions are as follows:

[0093] The control system supplies current to the electromagnetic block 803 corresponding to the movable block 704 according to the movable block 704 corresponding to the first pressure sensor with the smallest value. After the electromagnetic block 803 is supplied with current, a repulsive force is generated against the magnetic block 804. The electromagnetic block 803 is pushed to move to the side of the top cover by the magnetic block 804, and the two pushers 705 on the movable block 704 are controlled to extend synchronously, so that the ball 707 on the pusher 705 on one side of the movable block 704 contacts the top of the top cover, and the ball seat 706 on the pusher 705 on the other side of the movable block 704 engages with the air outlet on the top cover (see Fig.11 As shown), the two pushers 705 on the movable block 704 are then controlled to contract at different speeds. During the contraction process, the ball seats 706 and the balls 707 on the two pushers 705 clamp the cap structure 1003, causing the cap structure 1003 to deflect and gradually recover to a state parallel to the bottom of the steel shell structure 1001, thereby preventing the cap structure 1003 from interfering with the contraction of the head of the steel shell structure 1001 due to the tilted state of the cap structure 1003 when the pressing mold 505 is pressed down to seal the head of the steel shell structure 1001, resulting in the sealing of the sealed steel shell structure 1001 being lower than the production requirement.

[0094] It should be noted that the main reasons for the tilting of the cap structure 1003 are: during the vacuum process, the gas in the steel shell structure 1001 will be extracted, which will produce a certain airflow or pressure difference. This airflow or pressure difference may have a certain impact or influence on the position of the cap structure 1003, causing the cap structure 1003 to tilt; or before the lithium battery is transported to the sealing process, the cap structure 1003 is offset or tilted due to factors such as vibration during transportation.

[0095] Please note: Refer to Figures 10 to 13 As shown, in this embodiment, the air outlet is arranged at an angle. When the ball seat 706 needs to be engaged with the air outlet, the push member 705 on the movable block 704 can be moved to the bottom of the top cover by the electromagnetic member 8, and then the movable block 704 is controlled to move backward so that the ball seat 706 and the air outlet are engaged.

[0096] After the cap structure 1003 is in a straight state, the push member 705 is controlled to shrink and move downward with the pressing mold 505. The speed of the shrinkage of the push member 705 is consistent with the speed of the downward movement of the pressing mold 505. After the inclined mold part 506 of the pressing mold 505 contacts and extrude the head of the steel shell structure 1001, all the push members 705 are controlled to release the limit on the cap structure 1003. At the same time, the movable block 704 is pushed toward the head of the steel shell structure 1001 through the electromagnetic member 8. Finally, the control makes the push member 705 on the movable block 704 contact the head of the steel shell structure 1001 with different elongation amounts.

[0097] It should be noted that: after the oblique mold portion 506 of the pressing mold 505 contacts and extrude the head of the steel shell structure 1001, the head of the steel shell structure 1001 bends toward the direction of the cap structure 1003. While bending, the inner side of the steel shell structure 1001 extrude and limit the side of the cap structure 1003, so that during the bending process of the head of the steel shell structure 1001, the cap structure 1003 always remains in a stable state.

[0098] After the pusher 705 on the movable block 704 contacts the head of the steel shell structure 1001 with different extension amounts, taking a single movable block 704 as an example, the pusher 705 at one end of the movable block 704 toward the oblique mold portion 506 is controlled to extend, and the pusher 705 at one end of the movable block 704 toward the driving motor 9 is controlled to retract. Since the head of the steel shell structure 1001 is in a bent state at this time, the two pushers 705 on the single movable block 704 are extended and retracted respectively, and the ball seats 706 on the two pushers 705 fix and clamp the top of the steel shell structure 1001 (specifically, Fig.12 As shown), during the process of the ball seats 706 on the two pushers 705 fixing and clamping the top of the steel shell structure 1001, the electromagnetic member 8 is controlled to stop running. Under the elastic restoring force of the elastic member 802, the movable block 704 has a tendency to move toward the middle of the rotating seat 701, that is, the movable block 704 at this time can pull the top of the steel shell structure 1001 through the ball seats 706 on the pushers 705, so as to avoid the phenomenon of bulging on the head of the steel shell structure 1001 after sealing due to the different shrinkage rates when the pressing mold 505 performs the bending operation on the head of the steel shell structure 1001.

[0099] It should be noted that: after the pushing member 705 on the movable block 704 contacts the head of the steel shell structure 1001 with different elongations, other methods can be used to clamp the head of the steel shell structure 1001. Taking a single movable block 704 as an example, the pushing member 705 on the movable block 704 is controlled to contract, but the contraction speed of the pushing member 705 at one end of the movable block 704 toward the oblique mold part 506 is slower than the contraction speed of the pushing member 705 at one end of the movable block 704 toward the driving motor 9. Due to the difference in contraction speeds, the ball seats 706 on the two contraction speeds can fix and clamp the top of the steel shell structure 1001.

[0100] Since a second pressure sensor is provided at the connection between the elastic member 802 and the movable groove 6, when the movable block 704 pulls the top of the steel shell structure 1001 through the ball seat 706 on the pushing member 705, by detecting the value of the second pressure sensor, it can be obtained whether the displacement speed of the movable block 704 corresponding to the elastic member 802 is too fast, that is, whether the clamping force of the pushing member 705 on the movable block 704 on the steel shell structure 1001 is too small.

[0101] When it is detected that the value change speed of the second pressure sensor corresponding to a certain elastic member 802 is faster than the value change speed of the second pressure sensors corresponding to other elastic members 802, it indicates whether the clamping force of the pushing member 705 corresponding to the elastic member 802 on the steel shell structure 1001 is too small, resulting in too fast displacement speed of the movable block 704. At this time, the electromagnetic member 8 is controlled to push the movable block 704 with too fast displacement speed to move slightly toward the inclined mold part 506, and at the same time, the pushing member 705 on the movable block 704 is controlled to make adaptive adjustments, that is, to increase the clamping force of the pushing member 705 on the movable block 704 on the steel shell structure 1001. In this process, the electromagnetic member 8 is controlled to push the pushing members 705 on the remaining movable blocks 704 to move to the top of the top cover and squeeze the top cover to ensure that the stability of the cap structure 1003 is guaranteed while the clamping force at a certain point of the steel shell structure 1001 is increased.

[0102] After the pressing die 505 completes the bending operation on the steel shell structure 1001, the top of the oblique die portion 506 contacts the outer peripheral side of the cap structure 1003 through the steel shell structure 1001. At this time, the control system controls all the pushers 705 on the rotating seat 701 to shrink synchronously, and controls the electromagnetic member 8 to push the movable block 704 to move in the direction of the stepped groove 702. When the movable block 704 enters the interior of the stepped groove 702, the ball seat 706 on the outermost pusher 705 of the movable block 704 contacts the inner wall of the movable groove 6. At this time, the control system controls the pusher 705 to extend with different extension amounts, that is, the extension amount of the pusher 705 located on the outer side of the movable block 704 is greater than the extension amount of the pusher 705 located on the inner side of the movable block 704, so that the two balls 707 on the single movable block 704 are squeezed and contacted with the bent part of the steel shell structure 1001.

[0103] After the ball 707 is squeezed and contacted with the bent part of the steel shell structure 1001, the control system starts the drive motor 9, and the output shaft of the drive motor 9 drives the rotating seat 701 to rotate. During the rotation of the rotating seat 701, the movable block 704 is driven to rotate synchronously through the installation groove 703 and the limit rod 801. During the rotation of the movable block 704, the ball 707 on the pushing member 705 is in contact with the bent part of the steel shell structure 1001, and the pushing member 705 is in a continuously extended state. Therefore, during the process of the pushing member 705 revolving around the drive motor 9, the ball 707 continues to press the bent part of the steel shell structure 1001. It is worth noting that during the rotation of the rotating seat 701, the control system gradually reduces the current passed into the electromagnetic block 803, so that the repulsive force generated between the electromagnetic block 803 and the magnetic block 804 is gradually reduced. Under the elastic recovery ability of the elastic member 802, the movable block 704 drives the pushing member 705 to gradually move toward the center of the rotating seat 701. During this process, the ball 707 at the bottom of the rotating seat 701 synchronously moves toward the middle of the cap structure 1003, that is, moves from the outside to the inside of the bent portion of the steel shell structure 1001. During the movement, the ball 707 synchronously flattens the bent portion of the steel shell structure 1001 in all directions (refer to Fig.14 as shown).

[0104] It should be noted that: if the head length of the steel shell structure 1001 is much longer than the cap structure 1003, then when the movable block 704 drives the pushing member 705 to gradually move toward the center of the rotating seat 701, the pushing member 705 located on the inner side of the movable block 704 pushes the ball 707 to move downward, and the ball 707 pushes the top of the steel shell structure 1001 when moving downward, so that the top of the steel shell structure 1001 bends toward the cap structure 1003 again, and the top of the steel shell structure 1001 wraps the explosion-proof plate and the sealing ring of the cap structure 1003, thereby improving the sealing of the steel shell structure 1001.

[0105] The present invention provides an electromagnetic member 8 and a pusher 705. When the pressing die 505 moves downward, the ball 707 on the pusher 705 contacts the cap structure 1003 to maintain the stability of the cap structure 1003 and prevent the sealing performance of the sealed steel shell structure 1001 from being lower than the production requirement. When the pressing die 505 bends the head of the steel shell structure 1001, the ball seat 706 on the pusher 705 pulls the top of the steel shell structure 1001 to prevent the pressing die 505 from being pressed downward. 05 During the bending operation on the head of the steel shell structure 1001, a bulge appears on the head of the steel shell structure 1001; after the pressing mold 505 contacts the clamping block 4061, the two balls 707 on the pusher 705 are squeezed into contact with the bent part of the steel shell structure 1001. As the rotating seat 701 rotates, the balls 707 on the pusher 705 perform an all-round flattening operation on the bent part of the steel shell structure 1001, thereby improving the sealing of the steel shell structure 1001. Example 2

[0106] The present invention also provides a sealing method for a vacuum sealing device, the sealing method comprising the following steps:

[0107] S1. An external manipulator or a staff member moves the unsealed cylindrical lithium battery 100 into the positioning groove 402, and then uses the sealing flap 3 to seal the feed port, so that the interior of the upper base 101 is in a sealed state;

[0108] S2, start the clamping member 406 and the vacuum generator 201, the clamping member 406 positions and clamps the cylindrical lithium battery 100, the vacuum generator 201 performs a vacuum operation on the upper machine base 101 through the exhaust pipe 202, and the exhaust pipe 202 extracts the gas remaining in the unsealed cylindrical lithium battery 100;

[0109] S3, start the hydraulic pushing part 501, and the hydraulic pushing part 501 seals the cylindrical lithium battery 100 by pressing down the mold 505. During the sealing operation, the working state of the cylindrical lithium battery 100 is simultaneously detected, and according to the specific state of the cylindrical lithium battery 100, the adjustment component 7 is controlled to perform adaptive structural changes.

[0110] Although embodiments of the present invention have been shown and described, it will be apparent to those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A vacuum sealing device, the vacuum sealing device being used for the production of cylindrical lithium batteries (100), comprising a frame (1), characterized in that: The frame (1) comprises a lower base (102) and an upper base (101); a positioning device (4) is provided on the top of the lower base (102); the positioning device (4) is used to position and clamp the cylindrical lithium battery (100); a pressing assembly (5) is provided above the positioning device (4); the pressing assembly (5) is connected to the inner top of the upper base (101); the pressing assembly (5) is connected to the upper base (101); and the pressing assembly (5) is used to seal the cylindrical lithium battery (100); A vacuum generating device (2) is provided on the top of the upper machine base (101), the vacuum generating device (2) comprising a vacuum generator (201), the vacuum generator (201) being arranged on the top of the upper machine base (101), an exhaust pipe (202) being provided on the outside of the vacuum generator (201), the exhaust pipe (202) being connected to the inside of the upper machine base (101), an exhaust pipe (203) being provided on the outside of the vacuum generator (201), the exhaust pipe (203) being connected to an external collecting device; A feed inlet is provided on the outer side of the upper machine base (101), and a sealing flap (3) is provided on the outer side of the feed inlet. The sealing flap (3) is rotatably connected to the upper machine base (101) via a rotating member, and the sealing flap (3) blocks the feed inlet; The positioning device (4) comprises a positioning seat (401), the positioning seat (401) is fixedly connected to the lower machine base (102), the positioning seat (401) is provided with positioning grooves (402) distributed in an array, the bottom of each positioning groove (402) is provided with an air suction hole (405), and the air suction hole (405) is connected to an external air pump; The top of the positioning seat (401) is provided with positioning plates (403) distributed in an array, the positioning plates (403) are provided with positioning holes (404) corresponding to the positioning grooves (402), and the peripheral side of the positioning plate (403) is provided with clamping members (406) distributed in an array, and the clamping members (406) move laterally from the peripheral side of the positioning plate (403) to the positioning holes (404); The pressing assembly (5) comprises a hydraulic pushing part (501), the fixed end of the hydraulic pushing part (501) is fixedly connected to the inner top of the upper machine base (101), the output end of the hydraulic pushing part (501) is connected to a mounting plate (502), the bottom of the mounting plate (502) is provided with positioning sleeves (503) distributed in an array, and the bottom of the positioning sleeves (503) is connected to the top of the lower machine base (102); The bottom of the mounting plate (502) is provided with pressing dies (505) distributed in an array, and the positions of the pressing dies (505) correspond to the positions of the positioning grooves (402); The outer side of the pressing die (505) is provided with a mounting frame (504), one end of the mounting frame (504) away from the pressing die (505) is fixedly connected to the bottom of the mounting plate (502), and the bottom of the pressing die (505) is provided with an oblique die portion (506); The lower pressing die (505) is provided with a movable groove (6) inside, the movable groove (6) is connected to the oblique die portion (506), and an adjustment component (7) is provided inside the movable groove (6); The adjustment component (7) comprises a stepped groove (702) opened in the middle of the movable groove (6); a rotating seat (701) is provided inside the movable groove (6); the rotating seat (701) is rotatably connected to the stepped groove (702); the bottom of the rotating seat (701) is provided with mounting grooves (703) distributed in an array; a movable block (704) is provided inside the mounting groove (703); the movable block (704) is moved back and forth inside the mounting groove (703) by an electromagnetic member (8); an adjustment member is provided at the bottom of the movable block (704); the adjustment member pulls the cylindrical lithium battery (100); A driving motor (9) is provided on the top of the pressing die (505), a fixed end of the driving motor (9) is fixedly connected to the top of the pressing die (505), and an output end of the driving motor (9) penetrates into the interior of the pressing die (505) and is fixedly connected to the top of the rotating seat (701); The adjusting member comprises a pushing member (705), the fixed end of the pushing member (705) is symmetrically arranged at the bottom of the movable block (704), the telescopic end of the pushing member (705) is fixedly connected to a ball seat (706), the diameter of the ball seat (706) is larger than the diameter of the telescopic end of the pushing member (705), and a ball (707) is provided inside the ball seat (706); The electromagnetic component (8) comprises a limit rod (801), the limit rod (801) passes through the movable block (704) and is fixedly connected to two ends of the mounting groove (703), an elastic component (802) is sleeved on the outer side of the limit rod (801), one end of the elastic component (802) is connected to the movable block (704), and the other end of the elastic component (802) is connected to the mounting groove (703); A magnetic block (804) is provided at the end of the movable block (704), and an electromagnetic block (803) corresponding to the magnetic block (804) is provided at the end of the mounting groove (703).

2. The vacuum sealing device according to claim 1, characterized in that: The clamping member (406) comprises a clamping block (4061), the clamping block (4061) moves laterally from the circumferential side of the positioning plate (403) to the positioning hole (404), an end of the clamping block (4061) facing the positioning hole (404) is provided with an embracing surface, a convex strip (4062) is provided in the middle of the embracing surface, and a positioning member (4063) is provided in the middle of the clamping block (4061).

3. A sealing method for a vacuum sealing device, the sealing method being implemented by using the vacuum sealing device according to claim 2, characterized in that: The sealing method comprises the following steps: S1, using an external manipulator or a worker to move the unsealed cylindrical lithium battery (100) into the positioning groove (402), and then using the sealing flap (3) to seal the feed port, so that the interior of the upper machine base (101) is in a sealed state; S2, starting the clamping member (406) and the vacuum generator (201), the clamping member (406) positions and clamps the cylindrical lithium battery (100), the vacuum generator (201) performs a vacuum operation on the upper machine base (101) through the exhaust pipe (202), and the exhaust pipe (202) extracts the gas remaining inside the unsealed cylindrical lithium battery (100); S3, starting the hydraulic pushing part (501), the hydraulic pushing part (501) performs a sealing operation on the cylindrical lithium battery (100) by pressing down the mold (505), and synchronously detects the working state of the cylindrical lithium battery (100) during the sealing operation, and controls the adjustment component (7) to perform adaptive structural transformation according to the specific state of the cylindrical lithium battery (100).

4. Use of the vacuum sealing device as claimed in claim 2 in the production of cylindrical batteries.

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