A liquid injection and static integrated device for lithium nickel manganese oxide material battery

Abstract

This invention relates to the field of lithium battery processing technology, specifically to an integrated electrolyte injection and settling device for lithium nickel manganese oxide batteries. It includes a frame with loading / unloading stations, an electrolyte injection station, a electrolyte replenishment station, and a settling station arranged sequentially in a clockwise direction. A rotating frame is mounted on the frame, and four clamping systems are installed on the rotating frame. Each clamping system includes a hexagonal drive shaft rotatably connected to the rotating frame, and a vibrating frame slidably connected to the rotating frame, with a return spring installed between them. The beneficial effects of this invention are: addressing the problem that existing static electrolyte injection methods cannot overcome the surface tension barrier of deep micropores in lithium nickel manganese oxide electrodes, this device achieves active electrolyte penetration through a multi-dimensional composite vibration system. In the clamping system, the vibrating frame provides axial vibration, precisely matching the 3-5μm micropore structure, and promoting gradient wetting of the electrolyte along the electrode stacking direction. The vibrating frame provides radial vibration, breaking the edge surface tension and solving the problem of edge accumulation in the initial stage of electrolyte injection.

Description

Technical Field

[0001] This invention relates to the field of lithium material battery processing technology, specifically to an integrated equipment for liquid injection and settling of lithium nickel manganese oxide batteries. Background Technology

[0002] Lithium nickel manganese oxide (LiMO) has become a core cathode material in power batteries and energy storage batteries due to its high specific capacity, excellent thermal stability, and cost-effectiveness. To further improve battery energy density, existing LiMO electrodes generally adopt a porous design, constructing a 3-5 μm interconnected microporous structure through precision etching or low-temperature sintering processes. Among these, the deep micropores below 2 μm are key channels for the rapid migration of lithium ions, and their electrolyte wetting degree directly determines the battery's charge-discharge efficiency, cycle life, and safety performance. However, in the electrolyte injection processing of LiMO batteries, existing technologies have the following technical problems:

[0003] The deep micropores of lithium nickel manganese oxide electrodes have narrow inner diameters and tortuous channels. The surface tension of the electrolyte within the micropores is much greater than its own gravity and the driving force provided by existing equipment. Existing electrolyte injection equipment generally adopts a static injection mode. Due to the limitations of the static injection mode, on the one hand, it cannot generate sufficient pulse force to break through the surface tension barrier of the deep micropores, and on the other hand, it is insufficient to form a pressure gradient along the depth direction of the micropores. The electrolyte can only saturate the surface micropores and cannot actively penetrate to the bottom of the deep micropores, eventually forming cavities. These cavities prevent about 10%-12% of the active material inside the electrode from contacting the electrolyte, directly causing the actual battery capacity to decrease by 8%-10% compared to the design capacity. After 500 cycles, the capacity decay rate further increases to over 25%.

[0004] Based on this, the present invention provides an integrated device for liquid injection and settling of lithium nickel manganese oxide batteries to solve the problems mentioned in the background art. Summary of the Invention

[0005] This invention addresses the technical problems existing in the prior art by providing an integrated liquid injection and settling device for lithium nickel manganese oxide batteries. This solves the problem that existing liquid injection devices generally adopt a static liquid injection mode. Due to the limitations of the static liquid injection mode, on the one hand, it is impossible to generate sufficient pulse force to break through the surface tension barrier of deep micropores, and on the other hand, it is insufficient to form a pressure gradient along the depth direction of the micropores.

[0006] The technical solution of the present invention to solve the above technical problems is as follows: An integrated equipment for liquid injection and settling of lithium nickel manganese oxide material batteries includes a frame, on which loading and unloading stations, liquid injection stations, liquid replenishment stations and settling stations are arranged in a clockwise direction. A rotating frame is provided on the frame, and four clamping systems are provided on the rotating frame.

[0007] The clamping system includes a hexagonal drive shaft rotatably connected to a rotating frame, a shaft vibration frame slidably connected to the rotating frame, and a return spring installed between the two. An amplitude-changing transmission component driven by the hexagonal drive shaft is provided between the shaft vibration frame and the rotating frame. The amplitude-changing transmission component drives the shaft vibration frame to vibrate up and down with varying amplitude. A rotating frame is rotatably mounted on the shaft vibration frame. A vibration shaft is rotatably mounted inside the rotating frame. A spindle is rotatably mounted inside the vibration shaft. A half-tooth bevel gear is mounted on the top of the vibration shaft. A reciprocating screw is rotatably mounted on the rotating frame. A driven bevel gear that meshes with the half-tooth bevel gear is installed at the tail end of the reciprocating screw. A torsion spring is provided at the rotatable connection between the reciprocating screw and the rotating frame. A flat vibration frame is driven by the reciprocating screw and slidably connected to the rotating frame. A battery holder driven by the spindle is rotatably mounted on the flat vibration frame. A permanent magnet base is installed at the bottom of the battery holder. A battery shell is magnetically attracted to the permanent magnet base.

[0008] It also includes a transmission system, which drives the rotating frame to rotate at a first speed at the injection station and at a second speed at the replenishment station, drives the vibrating shaft to rotate at the injection station, and drives the hexagonal drive shaft to rotate at the injection station, replenishment station, and stationary station.

[0009] The top of the frame is equipped with an injection system that controls the pressure inside the battery case and the amount of liquid injected.

[0010] Based on the above technical solution, the present invention can be further improved as follows.

[0011] As a preferred technical solution of the present invention, the transmission system includes two servo motors mounted on the frame, a rotating shaft mounted on the axis of the rotating frame, the rotating shaft being rotatably connected to the frame, a bushing rotatably sleeved on the rotating shaft, a transmission gear ring mounted on the bushing, two first synchronous toothed belts being drivenly connected to the output shaft end of the servo motors, the two first synchronous toothed belts being drivenly connected to the rotating shaft and the bushing respectively, a low-speed toothed column and a high-speed toothed column being mounted on the bottom of the rotating frame, and external toothed columns being mounted on the bottom of the vibrating shaft and the spindle.

[0012] As a preferred technical solution of the present invention, the variable amplitude transmission component includes a top shaft rotatably connected to the rotating frame and an electric push rod mounted on the rotating frame. A drive frame is connected to the shaft vibration frame through two elastic preload members. A vibration adjustment frame is mounted on the movable end of the electric push rod. A semi-conical transmission body driven by a hexagonal drive shaft is rotatably mounted on the vibration adjustment frame. The semi-conical transmission body and the drive frame are subjected to frictional transmission. Both the top shaft and the hexagonal drive shaft are equipped with linkage bevel gears. The two linkage bevel gears are orthogonally meshed. A passive gear linked with the transmission system is mounted on the bottom end of the top shaft.

[0013] As a preferred embodiment of the present invention, the transmission system further includes three transmission shafts rotatably connected to the frame. The three transmission shafts are respectively located at the injection station, the replenishment station, and the stationary station. Each of the three transmission shafts has a lower gear meshing with a transmission gear ring at its bottom end. The transmission shaft at the injection station has a small gear meshing with a low-speed gear column, and the transmission shaft at the replenishment station has a large gear meshing with a high-speed gear column. The transmission shaft at the injection station also has two internal gears, which are respectively connected to the external gear columns on the vibrating shaft and the spindle. The transmission shafts at the injection station, the replenishment station, and the stationary station each have an upper gear connected to the driven gear.

[0014] As a preferred embodiment of the present invention, the low-speed gear, high-speed gear and external gear have the same tooth height, the pinion, gear and internal gear have the same tooth height, and the height of the low-speed gear is 5 to 8 times the tooth height of the pinion.

[0015] As a preferred technical solution of the present invention, the interior of the semi-conical transmission body is provided with a through groove that is slidably connected to the hexagonal drive shaft. The cross-sections of the through groove and the hexagonal drive shaft are both regular hexagonal. The semi-conical transmission body is provided with a wheel surface that is frictionally driven with the drive frame. The central angle corresponding to the wheel surface is 180°. The cross-section of the semi-conical transmission body is an isosceles trapezoid. Friction patterns are provided on both the wheel surface and the drive frame.

[0016] As a preferred technical solution of the present invention, the clamping system further includes a lead screw lifting module installed on the rotating frame. The lead screw lifting module is connected to a lifting frame, and a sealing rubber cylinder is installed on the lifting frame. A sealing ring that cooperates with the sealing rubber cylinder is rotatably installed on the battery holder. A corrugated telescopic section is fixedly provided on the sealing rubber cylinder, and the sealing rubber cylinder is made of rubber. An injection pipe is rotatably installed at the axial position of the sealing rubber cylinder, and a vacuum extraction pipe is connected to the sealing rubber cylinder.

[0017] As a preferred embodiment of the present invention, the liquid injection system includes a distribution cylinder mounted on a frame. The distribution cylinder contains a vacuum chamber and an electrolyte chamber that are isolated from each other. Both the top ends of the vacuum chamber and the electrolyte chamber are connected to flange joints. The distribution cylinder has two sets of through holes, which are respectively connected to the vacuum chamber and the electrolyte chamber. A rotary distributor is rotatably connected to the distribution cylinder. The vacuum extraction pipe is connected to the rotary distributor at the position corresponding to the vacuum chamber. The liquid injection pipe is connected to the rotary distributor at the position corresponding to the electrolyte chamber. A metering liquid addition valve is installed on the liquid injection pipe. A pressure probe, a solenoid valve, and a pressure relief valve are respectively installed on the vacuum extraction pipe. A filling pipe is rotatably connected to the bottom end of the liquid injection pipe. A liquid injection port is located at the top of the battery casing.

[0018] As a preferred technical solution of the present invention, a belt shaft is rotatably mounted on the flat vibrating frame, an elastic synchronous belt is connected between the belt shaft and the spindle, and a second synchronous toothed belt is connected between the belt shaft and the battery support.

[0019] As a preferred technical solution of the present invention, the elastic synchronous belt is made of rubber and provides elastic compensation for the displacement of the flat vibrating frame, the axis of the reciprocating screw is perpendicular to the axis of the spindle, and the radius of the half-tooth bevel gear is 6 to 9 times the radius of the driven bevel gear.

[0020] The beneficial effects of this invention are:

[0021] 1. To address the problem that existing static electrolyte injection methods cannot overcome the surface tension barrier of deep micropores in lithium nickel manganese oxide electrodes, this equipment achieves active electrolyte penetration through a multi-dimensional composite vibration system. In the clamping system, the shaft vibration frame provides axial vibration, precisely matching the 3-5μm micropore structure and promoting the electrolyte gradient wetting along the electrode stacking direction. The flat vibration frame provides radial vibration, breaking the edge surface tension and solving the problem of edge accumulation in the early stage of electrolyte injection. The two, together with the circumferential rotation of the battery holder, form a spiral penetration path. Combined with the vacuum environment of the electrolyte injection station, this allows the electrolyte to penetrate deep micropores and effectively reduces the vacancy rate of deep micropores.

[0022] 2. To address the limitation of existing technologies in forming a pressure gradient along the depth of micropores, this equipment achieves precise control through the coordinated use of staged process parameters. After 75% electrolyte is injected at the injection station, the replenishment station switches to small-amplitude vibration and high-speed rotation. The second preset centrifugal force is used to form a gradient pressure, which injects 25% of the replenishment into the unwetted deep micropores. The static station further employs large-amplitude vibration and strong vacuum, which intermittently pushes the microbubbles to collide and merge and quickly discharge them, thus improving the bubble discharge rate.

[0023] 3. This equipment innovatively adopts a linkage mechanism between the transmission system and the clamping system. The rotating frame is driven by a servo motor, which enables the clamping system to automatically switch between loading / unloading, liquid injection, liquid replenishment, and static positions. In the transmission system, the low-speed and high-speed gear columns are matched to the speed requirements of the liquid injection and liquid replenishment positions, respectively. With the help of the variable amplitude transmission component, the amplitude is dynamically adjusted by the electric push rod. The equipment can meet the differentiated vibration requirements of multiple positions without replacing parts, and the adjustment time is shortened. At the same time, the rotary sealing design of the sealing rubber sleeve and the rotary distributor achieves complete isolation between the vacuum and the liquid injection channel, avoids electrolyte contamination, and solves the leakage and entanglement problems of traditional equipment when switching between multiple positions. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of an integrated liquid injection and settling device for lithium nickel manganese oxide batteries according to the present invention;

[0025] Figure 2This is a schematic diagram of the structure of the flow divider and rotary distributor of the present invention;

[0026] Figure 3 This is a schematic diagram of the transmission shaft and upper gear of the present invention;

[0027] Figure 4 This is a schematic cross-sectional view of the vacuum chamber and electrolyte chamber of the present invention;

[0028] Figure 5 For the present invention Figure 4 A magnified schematic diagram of the local structure at point A;

[0029] Figure 6 For the present invention Figure 4 A magnified schematic diagram of the local structure at point B;

[0030] Figure 7 For the present invention Figure 4 A magnified schematic diagram of the structure at point C in the middle;

[0031] Figure 8 This is a schematic diagram of the structure of the vacuum extraction tube and the liquid injection hose of the present invention;

[0032] Figure 9 This is a schematic diagram of the sealing ring and return spring of the present invention;

[0033] Figure 10 For the present invention Figure 9 A structural diagram from another perspective;

[0034] Figure 11 For the present invention Figure 10 A magnified schematic diagram of the structure at point D.

[0035] The attached diagram lists the components represented by each number as follows:

[0036] 1. Frame; 2. Rotating frame; 3. Electric actuator; 4. Hexagonal drive shaft; 5. Shaft vibration frame; 6. Return spring; 7. Elastic preload; 8. Drive frame; 9. Vibration adjustment frame; 10. Semi-conical transmission body; 11. Rotating frame; 12. Vibration shaft; 13. Mandrel; 14. Semi-tooth bevel gear; 15. Reciprocating lead screw; 16. Torsion spring; 17. Flat vibration frame; 18. Battery holder; 19. Permanent magnet base; 20. Battery casing; 21. Servo motor; 22. Transmission gear ring; 23. Low-speed gear column; 24. High-speed gear column; 25. External gear. 26. Column; 27. Top shaft; 28. Driven gear; 29. ​​Drive shaft; 30. Lower gear; 31. Small gear; 32. Large gear; 33. Internal gear; 34. Upper gear; 35. Screw lifting module; 36. Lifting frame; 37. Sealing sleeve; 38. Sealing ring; 39. Injection pipe; 40. Vacuum extraction pipe; 41. Diverter; 42. Vacuum chamber; 43. Electrolyte chamber; 44. Rotary distributor; 45. Through hole; 46. Belt shaft; 47. Elastic synchronous belt; 48. Flange joint; 49. Filling pipe. Detailed Implementation

[0037] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0038] The present invention provides the following preferred embodiments.

[0039] like Figure 1-11 As shown, an integrated equipment for liquid injection and settling of lithium nickel manganese oxide batteries includes a frame 1, on which loading and unloading stations, liquid injection stations, liquid replenishment stations and settling stations are arranged sequentially in a clockwise direction.

[0040] In actual operation, a central control unit is installed on the frame 1, and a multi-degree-of-freedom robotic arm is configured at the loading and unloading station. The multi-degree-of-freedom robotic arm is used to realize the directional loading and unloading of the battery case 20.

[0041] The frame 1 is equipped with a rotating frame 2, and the frame 2 is equipped with four clamping systems;

[0042] The clamping system includes a hexagonal drive shaft 4 rotatably connected to the rotating frame 2, a shaft vibration frame 5 slidably connected to the rotating frame 2, and a return spring 6 installed between the two.

[0043] An amplitude-changing transmission component driven by a hexagonal drive shaft 4 is provided between the shaft vibration frame 5 and the rotating frame 2. The amplitude-changing transmission component drives the shaft vibration frame 5 to vibrate up and down with varying amplitude.

[0044] The variable amplitude transmission component includes a top shaft 26 rotatably connected to the rotating frame 2 and an electric push rod 3 mounted on the rotating frame 2. A drive frame 8 is connected to the shaft vibration frame 5 through two elastic preload members 7. A vibration adjustment frame 9 is mounted on the movable end of the electric push rod 3. A semi-cone transmission body 10 driven by a hexagonal drive shaft 4 is rotatably mounted on the vibration adjustment frame 9. The semi-cone transmission body 10 is frictionally transmitted with the drive frame 8. Both the top shaft 26 and the hexagonal drive shaft 4 are equipped with linkage bevel gears. The two linkage bevel gears mesh orthogonally. A passive gear 27 linked with the transmission system is mounted at the bottom end of the top shaft 26.

[0045] Both elastic preload members 7 include a T-shaped guide rod mounted on the shaft vibration frame 5. The T-shaped guide rod is slidably connected to the drive frame 8. A preload spring for preload limiting the drive frame 8 is sleeved on the T-shaped guide rod. The axis of the T-shaped guide rod is perpendicular to the vibration direction of the shaft vibration frame 5.

[0046] The interior of the semi-cone transmission body 10 is provided with a through groove that is slidably connected to the hexagonal drive shaft 4. The cross-sections of the through groove and the hexagonal drive shaft 4 are both regular hexagonal. The semi-cone transmission body 10 is provided with a wheel surface that is frictionally driven with the drive frame 8. The central angle corresponding to the wheel surface is 180°. The cross-section of the semi-cone transmission body 10 is an isosceles trapezoid. Friction patterns are provided on both the wheel surface and the drive frame 8.

[0047] When the transmission system drives the hexagonal drive shaft 4 to rotate, the regular hexagonal through slot can realize the non-slip torque transmission between the hexagonal drive shaft 4 and the semi-cone transmission body 10, and the semi-cone transmission body 10 rotates synchronously with the hexagonal drive shaft 4.

[0048] When the wheel surface contacts the drive frame 8, the transmission friction is increased through the friction texture, which drives the drive frame 8 to slide along the shaft vibration frame 5, thereby pushing the shaft vibration frame 5 to compress the return spring 6;

[0049] When the non-friction area of ​​the wheel surface turns to drive frame 8, the return spring 6 pulls the shaft vibration frame 5 back to its original position, forming intermittent vibration. This process is coordinated with the action of electric push rod 3 to adjust the position of vibration adjustment frame 9. The contact pressure between the semi-cone transmission body 10 and drive frame 8 can be changed by electric push rod 3, and the vibration amplitude of shaft vibration frame 5 can be dynamically adjusted.

[0050] The intermittent vibration design of the 180° wheel surface allows the electrolyte injection station to generate one vibration pulse per rotation when it vibrates axially and radially. This ensures that the electrolyte spreads along the stacking direction and edge direction of the lithium nickel manganese oxide electrode, improving the uniformity of battery liquid wetting, while also preventing the electrode active material from falling off due to continuous vibration.

[0051] The electric actuator 3 can adjust the position of the vibration adjustment frame 9, change the contact pressure between the semi-cone transmission body 10 and the drive frame 8, dynamically adjust the amplitude of the shaft vibration frame 5, and adapt to the vibration requirements of different work positions.

[0052] Traditional fixed amplitude vibration structures cannot meet the diverse needs of large amplitude wetting during liquid injection, small amplitude hole filling during liquid replenishment, and large amplitude defoaming during static placement. This solution adjusts the amplitude through contact pressure, eliminating the need to replace vibration components, effectively shortening the amplitude adjustment time, and solving the problem of difficult amplitude adaptation for multiple workstations.

[0053] A rotating frame 11 is rotatably mounted on the vibrating frame 5. A vibrating shaft 12 is rotatably mounted inside the rotating frame 11. A spindle 13 is rotatably mounted inside the vibrating shaft 12. A half-tooth bevel gear 14 is mounted on the top of the vibrating shaft 12. A reciprocating screw 15 is rotatably mounted on the rotating frame 11. A driven bevel gear that meshes with the half-tooth bevel gear 14 is mounted at the tail end of the reciprocating screw 15.

[0054] In a preferred embodiment, the axis of the reciprocating lead screw 15 is perpendicular to the axis of the spindle 13, and the radius of the half-tooth bevel gear 14 is 8 times the radius of the driven bevel gear.

[0055] A torsion spring 16 is provided at the rotational connection between the reciprocating lead screw 15 and the rotating frame 11. A flat vibrating frame 17 is connected to the reciprocating lead screw 15 and is slidably connected to the rotating frame 11.

[0056] In the liquid injection station, the transmission system drives the vibrating shaft 12 to rotate, and the half-tooth bevel gear 14 at the top of the vibrating shaft 12 synchronously meshes with the driven bevel gear, driving the reciprocating screw 15 to rotate.

[0057] Since the radius ratio of the semi-tooth bevel gear 14 to the driven bevel gear is 8 times, the rotation ratio of the reciprocating screw 15 can be increased, and the flat vibrating frame 17 can be driven to slide smoothly along the rotating frame 11.

[0058] The torsion spring 16 stores elastic potential energy when the reciprocating screw 15 rotates. When the vibrating shaft 12 stops driving, the torsion spring 16 releases potential energy to drive the reciprocating screw 15 to rotate in the opposite direction, so that the flat vibrating frame 17 returns to its original position. This process is coordinated with the action of the spindle 13 driving the battery holder 18 to rotate. The reciprocating movement direction of the flat vibrating frame 17 is perpendicular to the rotation direction of the battery holder 18, forming a composite motion of horizontal vibration and circular rotation.

[0059] The above-mentioned structural design breaks the limitation of traditional single vibration direction. The vertically arranged reciprocating lead screw 15 and spindle 13 can enable the flat vibrating frame 17 to drive the battery support cylinder 18 to reciprocate along the axial direction.

[0060] Through the bidirectional vibration of the flat vibrating frame 17 and the shaft vibrating frame 5 and the synchronous circumferential rotation of the battery support 18, the filled electrolyte forms a spiral permeation path in the micropores of the lithium nickel manganese oxide electrode, thereby improving the deep pore filling rate.

[0061] A battery holder 18 driven by a spindle 13 is rotatably mounted on the flat vibrating frame 17. A permanent magnet base 19 is installed at the bottom inner part of the battery holder 18, and a battery shell 20 is magnetically attached to the permanent magnet base 19.

[0062] A belt shaft 45 is rotatably mounted on the vibrating frame 17. An elastic synchronous belt 46 is connected between the belt shaft 45 and the spindle 13. A second synchronous toothed belt is connected between the belt shaft 45 and the battery holder 18.

[0063] The elastic synchronous belt 46 is made of rubber and provides elastic compensation for the displacement of the flat vibrating frame 17.

[0064] When the transmission system drives the spindle 13 to rotate, the spindle 13 drives the belt shaft 45 to rotate through the elastic synchronous belt 46, and the belt shaft 45 then transmits the torque to the battery holder 18 through the second synchronous toothed belt, so that the battery holder 18 rotates synchronously with the spindle 13.

[0065] When the flat vibrating frame 17 slides along the rotating frame 11, the elastic synchronous belt 46 can compensate for the displacement of the flat vibrating frame 17 through the elastic deformation of its own rubber material, avoiding sudden changes in the tension of the transmission belt. This process is coordinated with the action of the permanent magnet seat 19 in the battery holder 18 to magnetically attract the battery case 20, ensuring that the battery case 20 rotates stably with the battery holder 18 without relative displacement.

[0066] The permanent magnet base 19 is a permanent magnet;

[0067] It also includes a transmission system, which drives the rotating frame 11 to rotate at a first speed at the liquid injection station and at a second speed at the liquid replenishment station, drives the vibrating shaft 12 to rotate at the liquid injection station, and drives the hexagonal drive shaft 4 to rotate at the liquid injection station, the liquid replenishment station, and the stationary station.

[0068] In a preferred embodiment, the first rotational speed is 400 rpm and the second rotational speed is 550 rpm;

[0069] The transmission system includes two servo motors 21 mounted on the frame 1, a rotating shaft mounted on the axis of the rotating frame 2, the rotating shaft being rotatably connected to the frame 1, a bushing being rotatably fitted on the rotating shaft, a transmission gear ring 22 being mounted on the bushing, two first synchronous toothed belts being driven to the output shaft end of the servo motors 21, the two first synchronous toothed belts being driven to the rotating shaft and the bushing respectively, a low-speed toothed column 23 and a high-speed toothed column 24 being mounted on the bottom of the rotating frame 11, and external toothed columns 25 being mounted on the bottom of the vibrating shaft 12 and the spindle 13.

[0070] The transmission system also includes three transmission shafts 28 rotatably connected to the frame 1. The three transmission shafts 28 are respectively set at the injection station, the replenishment station and the stationary station. The bottom end of each of the three transmission shafts 28 is equipped with a lower gear 29 that meshes with the transmission gear ring 22. The transmission shaft 28 in the injection station is equipped with a small gear 30 that meshes with the low-speed gear column 23. The transmission shaft 28 in the replenishment station is equipped with a large gear 31 that meshes with the high-speed gear column 24. The transmission shaft 28 in the injection station is also equipped with two internal gears 32. The two internal gears 32 are respectively connected to the external gear column 25 on the vibrating shaft 12 and the spindle 13.

[0071] The drive shafts 28 in the injection station, replenishment station and settling station are all equipped with upper gears 33 that are connected to the driven gears 27.

[0072] Specifically, in a preferred embodiment;

[0073] At the electrolyte injection station, the amplitude of the flat vibrating frame 17 is 15μm, the amplitude of the shaft vibrating frame 5 is 20μm, the circumferential rotation speed of the battery support cylinder 18 is 400rpm, the total amount of electrolyte injected into the battery casing 20 is 75%, and the vacuum pressure value of the vacuum pumping pipe 39 at this station is -75Kpa.

[0074] The axial vibration of the shaft vibration frame 5 is precisely matched with the layered structure of the lithium nickel manganese oxide electrode along the electrode stacking direction. The 20μm of the shaft vibration frame 5 can drive the electrolyte to gradually penetrate into the 3-5μm micropores.

[0075] The radial vibration of the flat vibrator 17 along the edge of the electrode is designed to address the problem of slow electrolyte accumulation at the edge during the initial stage of electrolyte injection. The 15μm amplitude of the flat vibrator 17 can break the surface tension barrier at the edge, allowing the electrolyte to quickly cover the edge area of ​​the electrode.

[0076] The 400 rpm rotation speed corresponds to the first preset centrifugal acceleration and the first preset centrifugal force. The first preset centrifugal force can make 75% of the large dose of electrolyte form a spiral penetration path under the combined vibration action, which avoids electrolyte accumulation caused by low rotation speed and splashing caused by high rotation speed.

[0077] At the electrolyte replenishment station, the amplitude of the shaft vibration frame 5 is 12µm, the rotation speed of the battery support 18 is 550rpm, the total amount of electrolyte injected into the battery casing 20 is 25% of the remaining amount, and the vacuum pressure of the vacuum extraction pipe 39 is -55Kpa;

[0078] After being soaked in 75% electrolyte at the injection station, the lithium nickel manganese oxide electrode still has 2-3μm deep micropores that are not filled. A small axial amplitude of 12μm can drive 25% of the replenishing liquid into the deep micropores in a directional manner through micropulse, without damaging the already formed surface electrolyte distribution.

[0079] The 550 rpm rotation speed corresponds to the second preset centrifugal acceleration and the second preset centrifugal force. The second preset centrifugal force can generate a pressure gradient along the depth direction of the electrode, which can inject 25% of the replenishment liquid into the micropores below 2μm that were not reached during the injection stage, thus solving the problem of difficult deep hole wetting of lithium nickel manganese oxide materials.

[0080] The 25% replenishment volume is relatively small, and the high-speed rotation at 550 rpm can shorten the replenishment time.

[0081] At the stationary position, the amplitude of the shaft vibration frame 5 is 25µm, and the vacuum pressure of the vacuum pump pipe 39 is -85Kpa.

[0082] After liquid injection and replenishment, the tiny air bubbles remaining in the battery casing 20 are difficult to expel naturally. The large axial amplitude of 25μm can cause the tiny air bubbles to collide and merge with each other through intermittent pushing action. Combined with the -85Kpa negative pressure of the vacuum pump pipe 39 in the stationary position, the air bubble discharge rate is improved.

[0083] The tooth heights of the low-speed gear 23, high-speed gear 24, and external gear 25 are the same, and the tooth heights of the pinion 30, gear 31, and internal gear 32 are the same.

[0084] In a preferred embodiment, the height of the low-speed gear 23 is 7 times the tooth height of the pinion 30;

[0085] Since the height of the low-speed gear spur 23 is 7 times the tooth height of the pinion 30, the pinion 30 can stably mesh within the axial range of the low-speed gear spur 23. Even if the rotating frame 11 experiences a small axial displacement due to vibration, it will still maintain the meshing state.

[0086] This process coordinates with the action of the internal gear 32 on the transmission shaft 28 driving the vibration shaft 12 and the mandrel 13 to rotate, ensuring that the multiple actions of the injection station rotating frame 11 rotating, the vibration shaft 12 driving vibration, and the mandrel 13 driving the support cylinder to rotate are synchronized, adapting to the process requirements of 75% injection volume.

[0087] The clamping system also includes a screw lifting module 34 installed on the rotating frame 2. A lifting frame 35 is connected to the screw lifting module 34. A sealing tube 36 is installed on the lifting frame 35. A sealing ring 37 that cooperates with the sealing tube 36 is rotatably installed on the battery support 18. A corrugated telescopic section is fixedly provided on the sealing tube 36 and the sealing tube 36 is made of rubber. An injection pipe 38 is rotatably installed at the axial position of the sealing tube 36. A vacuum extraction pipe 39 is connected to the sealing tube 36.

[0088] When the battery cell enters the battery tray 18 from the loading and unloading station, the screw lifting module 34 drives the lifting frame 35 to descend, causing the sealing tube 36 to fit with the sealing ring 37 on the battery tray 18 and forming a sealed environment.

[0089] The corrugated expansion section of the sealing sleeve 36 is arranged along the axial direction, and can generate 0.5-2mm elastic deformation with the vibration of the shaft vibrating frame 5 and the flat vibrating frame 17 to ensure that the sealing environment of the battery case 20 does not fail.

[0090] During liquid injection, the liquid injection tube 38 delivers electrolyte in a quantitative manner through the electrolyte chamber 42, and the vacuum extraction tube 39 extracts air from the battery casing 20 through the vacuum chamber 41.

[0091] This process coordinates with the vibration and rotation of the transmission system to achieve an integrated process of sealing, liquid injection, and defoaming.

[0092] A liquid injection system is installed on the top of the frame 1 to control the pressure and liquid volume inside the battery case 20.

[0093] Based on the above technical solution, the present invention can be further improved as follows.

[0094] The liquid injection system includes a distribution cylinder 40 mounted on the frame 1. The distribution cylinder 40 has a vacuum chamber 41 and an electrolyte chamber 42 that are isolated from each other. The top ends of the vacuum chamber 41 and the electrolyte chamber 42 are connected to flange joints 47. The distribution cylinder 40 has two sets of through holes 44, which are connected to the vacuum chamber 41 and the electrolyte chamber 42 respectively. A rotary distributor 43 is rotatably connected to the distribution cylinder 40. A vacuum pump pipe 39 is connected to the rotary distributor 43 at the position corresponding to the vacuum chamber 41. A liquid injection pipe 38 is connected to the rotary distributor 43 at the position corresponding to the electrolyte chamber 42. A metering liquid addition valve is installed on the liquid injection pipe 38. A pressure probe, a solenoid valve, and a pressure relief valve are installed on the vacuum pump pipe 39 respectively. The bottom end of the liquid injection pipe 38 is rotatably connected to a filling pipe 48. A liquid injection port is opened on the top of the battery casing 20.

[0095] Both injection tube 38 and filling tube 48 are corrugated metal tubes;

[0096] In the liquid injection station, the liquid injection system stores electrolyte through the electrolyte chamber 42 of the diversion cylinder 40, and the quantitative liquid addition valve controls the liquid injection pipe 38 to supply liquid to the battery case 20 according to the preset dosage.

[0097] The quantitative liquid addition valve is controlled by the central control unit. The liquid injection station can inject 75% of the total volume of the battery case 20 in a single operation, and the liquid replenishment station can inject 25% of the total volume. The flow sensor built into the quantitative liquid addition valve provides real-time feedback and adjustment.

[0098] At the same time, the vacuum extraction pipe 39 extracts air from the battery casing 20 through the vacuum chamber 41 of the diverter 40, the air pressure probe monitors the negative pressure in real time, and the solenoid valve automatically starts and stops the extraction according to the pressure value.

[0099] When replenishing the liquid, switch the quantitative liquid addition valve to 25% replenishment volume and adjust the negative pressure of the vacuum pump pipe 39 to -55Kpa;

[0100] When the stationary position is maintained, the liquid injection pipe 38 stops supplying liquid, and the vacuum pumping pipe 39 increases the negative pressure to -85Kpa, which, together with the 25μm amplitude of the shaft vibration frame 5, eliminates residual bubbles.

[0101] Throughout the process, the vacuum chamber 41 of the distributor 40 is completely isolated from the electrolyte chamber 42 to prevent the electrolyte from contaminating the vacuum system. The rotary distributor 43 rotates synchronously with the rotating frame 2 to ensure that the vacuum pumping pipe 39 and the liquid injection pipe 38 do not become entangled.

[0102] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An integrated equipment for liquid injection and settling in lithium nickel manganese oxide batteries, comprising a frame (1), characterized in that, The frame (1) is provided with loading and unloading stations, liquid injection station, liquid replenishment station and stationary station in a clockwise direction. The frame (1) is provided with a rotating frame (2) and four clamping systems. The clamping system includes a hexagonal drive shaft (4) rotatably connected to a rotating frame (2), a shaft vibration frame (5) slidably connected to the rotating frame (2), and a return spring (6) installed between the two. An amplitude-changing transmission component driven by the hexagonal drive shaft (4) is provided between the shaft vibration frame (5) and the rotating frame (2). The amplitude-changing transmission component drives the shaft vibration frame (5) to vibrate up and down with varying amplitude. A rotating frame (11) is rotatably mounted on the shaft vibration frame (5). A vibrating shaft (12) is rotatably mounted inside the rotating frame (11). A spindle (13) is rotatably mounted inside the vibrating shaft (12). A semi-tooth bevel gear (14) is mounted on the top of the vibrating shaft (12). 11) A reciprocating screw (15) is rotatably mounted on the reciprocating screw (15). A driven bevel gear that meshes with a half-tooth bevel gear (14) is mounted at the tail end of the reciprocating screw (15). A torsion spring (16) is provided at the rotatable connection between the reciprocating screw (15) and the rotating frame (11). A flat vibrating frame (17) is driven on the reciprocating screw (15), and the flat vibrating frame (17) is slidably connected to the rotating frame (11). A battery holder (18) driven by a spindle (13) is rotatably mounted on the flat vibrating frame (17). A permanent magnet base (19) is installed at the bottom of the battery holder (18), and a battery shell (20) is magnetically attracted to the permanent magnet base (19). It also includes a transmission system, which drives the rotating frame (11) to rotate at a first speed at the injection station and at a second speed at the replenishment station, drives the vibrating shaft (12) to rotate at the injection station, and drives the hexagonal drive shaft (4) to rotate at the injection station, replenishment station and stationary station. The top of the frame (1) is equipped with an injection system that controls the pressure and injection volume inside the battery case (20).

2. The integrated equipment for electrolyte injection and settling in lithium nickel manganese oxide batteries according to claim 1, characterized in that, The transmission system includes two servo motors (21) mounted on the frame (1), a rotating shaft is mounted on the axis of the rotating frame (2), the rotating shaft is rotatably connected to the frame (1), a bushing is rotatably fitted on the rotating shaft, a transmission gear ring (22) is mounted on the bushing, two first synchronous toothed belts are connected to the output shaft of the servo motor (21), the two first synchronous toothed belts are respectively connected to the rotating shaft and the bushing, a low-speed toothed column (23) and a high-speed toothed column (24) are mounted on the bottom of the rotating frame (11), and an external toothed column (25) is mounted on the bottom of the vibrating shaft (12) and the spindle (13).

3. The integrated equipment for electrolyte injection and settling in lithium nickel manganese oxide batteries according to claim 2, characterized in that, The variable amplitude transmission component includes a top shaft (26) rotatably connected to the rotating frame (2) and an electric push rod (3) mounted on the rotating frame (2). The shaft vibration frame (5) is connected to a drive frame (8) through two elastic preloads (7). The movable end of the electric push rod (3) is equipped with a vibration adjustment frame (9). The vibration adjustment frame (9) is rotatably mounted with a semi-conical transmission body (10) driven by a hexagonal drive shaft (4). The semi-conical transmission body (10) and the drive frame (8) are driven by friction. Both the top shaft (26) and the hexagonal drive shaft (4) are equipped with linkage bevel gears. The two linkage bevel gears are orthogonally meshed. The bottom end of the top shaft (26) is equipped with a passive gear (27) that is linked with the transmission system.

4. The integrated liquid injection and settling device for lithium nickel manganese oxide batteries according to claim 3, characterized in that, The transmission system also includes three transmission shafts (28) rotatably connected to the frame (1). The three transmission shafts (28) are respectively set at the injection station, replenishment station and stationary station. The bottom end of each of the three transmission shafts (28) is equipped with a lower gear (29) that meshes with the transmission gear ring (22). The transmission shaft (28) in the injection station is equipped with a small gear (30) that meshes with the low-speed gear column (23). The transmission shaft (28) in the replenishment station is equipped with a large gear (31) that meshes with the high-speed gear column (24). The transmission shaft (28) in the injection station is also equipped with two internal gears (32). The two internal gears (32) are respectively connected to the external gear column (25) on the vibrating shaft (12) and the spindle (13). The transmission shafts (28) in the injection station, replenishment station and stationary station are all equipped with an upper gear (33) that is connected to the driven gear (27).

5. The integrated equipment for electrolyte injection and settling in lithium nickel manganese oxide batteries according to claim 4, characterized in that, The low-speed gear column (23), high-speed gear column (24) and external gear column (25) have the same tooth height, the pinion (30), gear (31) and internal gear (32) have the same tooth height, and the height of the low-speed gear column (23) is 5 to 8 times the tooth height of the pinion (30).

6. The integrated equipment for electrolyte injection and settling in lithium nickel manganese oxide batteries according to claim 3, characterized in that, The interior of the semi-cone transmission body (10) is provided with a through groove that is slidably connected to the hexagonal drive shaft (4). The cross-sections of the through groove and the hexagonal drive shaft (4) are both regular hexagons. The semi-cone transmission body (10) is provided with a wheel surface that is frictionally driven with the drive frame (8). The central angle corresponding to the wheel surface is 180°. The cross-section of the semi-cone transmission body (10) is an isosceles trapezoid. Friction patterns are provided on both the wheel surface and the drive frame (8).

7. The integrated equipment for electrolyte injection and settling in lithium nickel manganese oxide batteries according to claim 1, characterized in that, The clamping system also includes a screw lifting module (34) installed on the rotating frame (2). The screw lifting module (34) is connected to a lifting frame (35). A sealing tube (36) is installed on the lifting frame (35). A sealing ring (37) that cooperates with the sealing tube (36) is rotatably installed on the battery holder (18). A corrugated telescopic section is fixedly provided on the sealing tube (36), and the sealing tube (36) is made of rubber. An injection pipe (38) is rotatably installed at the axial position of the sealing tube (36). A vacuum extraction pipe (39) is connected to the sealing tube (36).

8. The integrated equipment for electrolyte injection and settling in lithium nickel manganese oxide batteries according to claim 7, characterized in that, The liquid injection system includes a distribution cylinder (40) mounted on a frame (1). The distribution cylinder (40) has a vacuum chamber (41) and an electrolyte chamber (42) that are isolated from each other. The top ends of the vacuum chamber (41) and the electrolyte chamber (42) are connected to flange joints (47). The distribution cylinder (40) has two sets of through holes (44), which are respectively connected to the vacuum chamber (41) and the electrolyte chamber (42). A rotary distributor (43) is rotatably connected to the distribution cylinder (40). The vacuum extraction pipe (39) is connected to the rotary distributor (43) at the position corresponding to the vacuum chamber (41), the liquid injection pipe (38) is connected to the rotary distributor (43) at the position corresponding to the electrolyte chamber (42), a quantitative liquid addition valve is installed on the liquid injection pipe (38), a pressure probe, a solenoid valve and a pressure relief valve are respectively installed on the vacuum extraction pipe (39), the bottom end of the liquid injection pipe (38) is rotatably connected to the injection pipe (48), and a liquid injection port is opened on the top of the battery casing (20).

9. The integrated equipment for electrolyte injection and settling in lithium nickel manganese oxide batteries according to claim 1, characterized in that, A belt shaft (45) is rotatably mounted on the flat vibrating frame (17). An elastic synchronous belt (46) is connected between the belt shaft (45) and the spindle (13). A second synchronous toothed belt is connected between the belt shaft (45) and the battery holder (18).

10. The integrated equipment for electrolyte injection and settling in lithium nickel manganese oxide batteries according to claim 9, characterized in that, The elastic synchronous belt (46) is made of rubber and provides elastic compensation for the displacement of the flat vibrating frame (17). The axis of the reciprocating screw (15) is perpendicular to the axis of the spindle (13). The radius of the half-tooth bevel gear (14) is 6 to 9 times the radius of the driven bevel gear.

Images