Lithium battery winding production process and equipment thereof

Abstract

The invention relates to a lithium battery winding production process and equipment thereof, the equipment comprises an automatic core rod feeding mechanism, a core rod carrying and feeding mechanism, a winding needle turret, a winding needle, a diaphragm hot cutting device and a discharging mechanism, the automatic core rod feeding mechanism separates single core rods, the winding needle turret is provided with a feeding and discharging station, a winding station and an ending station, and the winding needle turret is provided with a diaphragm hot cutting device. Three winding needles are installed in front of the winding needle rotating tower and correspond to the feeding and discharging station, the winding station and the ending station respectively, the core rod carrying and feeding mechanism drives a core rod to be installed in the winding needles at the feeding and discharging station, the diaphragm hot cutting device cuts off a diaphragm at the winding station and adheres the diaphragm to the core rod, the discharging mechanism takes a wound battery cell out of the winding needles, and the winding mechanism conveys the battery cell to the ending station. The core rod is arranged on the winding needle at first, then the pole piece and the diaphragm are wound on the core rod, and finally the final forming of the battery cell is finished, so that the size of the central hole after the battery cell is formed can be ensured, the central hole is not easy to deform when the battery cell is carried, clamped and extruded, and the improvement of the performance of the battery cell by the central hole of the battery cell is guaranteed.

Description

Technical Field

[0001] The present invention relates to the field of lithium battery production, and in particular to a lithium battery winding production process and equipment thereof. Background Art

[0002] In the prior art, the production process of lithium batteries is as follows Figure 1 As shown, the characteristics of this process are: ⑴ Traditional diaphragm cutting is usually divided into two types, one is hot cutting and the other is cold cutting. The hot cutting method is to heat the resistance wire to a certain temperature, and then the mechanism brings the resistance wire forward to cut the diaphragm, while the cold cutting method is that the mechanism directly brings the high-speed stainless steel cutter forward to cut the diaphragm. The two cutting methods have their own advantages, and it is necessary to comprehensively compare and choose which one; ⑵ Before the upper and lower diaphragms are cut, the B winding needle in the waiting position is in an extended state and the A winding needle is in a retracted state. When the diaphragm needs to be cut, the wound battery cell will change from the winding position to the gluing position, and the waiting position will change to the winding position because the turret rotates 120°. At this time, the A needle will extend outward, through the A needle and the B needle. The extremely small gap between the needles compresses the diaphragm. When the diaphragm is cut, the winding needle will rotate on itself and pre-rotate the diaphragm onto the winding needle, thus completing the automatic cutting and pre-rotation of the diaphragm; ⑶ After the battery cell is wound and formed with adhesive tape, the battery cell needs to be pulled off the winding needle for unloading. When the battery cell is pulled off, the inner hole diameter in the middle of the battery cell (winding needle diameter) is prone to deformation and shrinkage. In order not to affect the process size of the battery cell, a hot hole process will be added before the battery cell is unloaded. That is, a needle rod of appropriate diameter is heated and then inserted into the center of the battery cell to preheat and pre-harden the center hole of the battery cell to ensure that the center hole of the battery cell after unloading has a process hole of appropriate size to meet the demand for the battery cell to have a suitable process hole.

[0003] From the above introduction, we can know that the center hole of the battery cell is one of the important factors affecting the performance of the battery cell. The center holes of the battery cells on the market are relatively small and easy to deform, and usually cannot meet the process requirements of the battery cell. So how much effect does the center hole of the battery cell have on the battery cell? In general, the main functions of the center hole of the cylindrical battery include exhaust, heat dissipation, liquid injection, improving battery performance, and as part of thermal management. The specific explanation is as follows:

[0004] ⑴ Exhaust and heat dissipation: The central hole of the cylindrical battery helps to exhaust gas, allowing the gas generated inside the battery to be discharged smoothly, thereby reducing the pressure inside the battery and preventing the battery from violently exploding. At the same time, this hole also promotes heat dissipation and better dissipates the heat generated by the battery when it is working.

[0005] ⑵ Injection design: In the design of cylindrical batteries, the location of the injection hole is an important consideration. Tesla's design places the injection hole in the center. This design has a high degree of automation because it is easy to find the center of a cylindrical battery as long as the outer shell is positioned. In contrast, the eccentric design requires the electrical equipment system to determine the location of the hole, and the degree of automation is low. Therefore, designing the hole in the center is a better choice.

[0006] ⑶ Improve battery performance: By inserting a steel needle into the center hole of a cylindrical battery, the battery performance can be improved. This is because the instability of the internal structure of the battery may lead to poor electrode contact, affecting the battery's conductivity and energy transmission efficiency. The needle can compensate for the impact of structural instability to a certain extent and improve the battery's new energy.

[0007] ⑷ Thermal management: In some designs, the center hole inside the cylindrical battery and the outside of the battery are filled and wrapped with phase change materials respectively. In this design, during the cooling process, the phase change material in the center hole absorbs a large amount of heat using its own heat capacity and latent heat of phase change, which can effectively suppress the temperature rise inside the battery and prevent the center temperature of the battery from being too high during the charging and discharging process. At the same time, in the low temperature environment of the battery, the phase change material in the center hole solidifies and releases heat, which can keep the battery warm and prevent the battery temperature from being too low. This design achieves the effect of cooling and heating the battery both inside and outside through the thermal management method of filling the battery with phase change material, avoids excessive temperature differences in the battery cells, and improves the battery's charging and discharging performance.

[0008] In summary, the design and application of the center hole of cylindrical batteries play an important role in improving the safety, performance and thermal management efficiency of batteries. The reasonable center hole size of cylindrical batteries has a huge impact on the overall size of the battery. In order to solve the problems existing in the center hole of battery cells on the market, this patented process equipment was developed. Summary of the invention

[0009] In view of the above-mentioned defects in the prior art, the technical problem to be solved by the present invention is to provide a lithium battery production process and equipment that can solve the problem that the center hole of the battery cell is easy to deform. The specific technical solution is as follows:

[0010] A lithium battery winding production equipment comprises an automatic core rod loading mechanism, a core rod conveying and feeding mechanism, a winding needle turret, a winding needle, a diaphragm hot cutting device and a feeding mechanism. A plurality of hollow core rods are placed in the automatic core rod loading mechanism. The automatic core rod loading mechanism separates a single core rod. The winding needle turret is provided with a loading and unloading station, a winding station and a finishing station. The loading and unloading station, the winding station and the finishing station are distributed around the central circumference of the winding needle turret. Three winding needles are installed in front of the winding needle turret. The three winding needles correspond to the loading and unloading station, the winding station and the finishing station respectively. The core rod conveying and feeding mechanism drives the core rod to be loaded into the winding needle at the loading and unloading station. The diaphragm hot cutting device cuts off the diaphragm at the winding station and sticks the diaphragm to the core rod. The feeding mechanism takes the wound battery cell out of the winding needle.

[0011] As a preferred embodiment of the equipment of the present invention, the automatic mandrel loading mechanism includes a base, a transverse movement assembly, a lifting assembly, a lifting block, a mandrel storage box and a fixed block. The transverse movement assembly is installed above the base, the lifting assembly is installed at the output end of the transverse movement assembly, and the lifting block is installed at the output end of the lifting assembly. The transverse movement assembly and the lifting assembly cooperate with each other to drive the lifting block to move forward and backward and up and down. A plurality of mandrels are installed inside the mandrel storage box. The bottom surface of the mandrel storage box is an inclined surface. An opening is provided at one end of the mandrel storage box and the opening is connected to the lifting block. The mandrels in the mandrel storage box roll down to the lifting block. There are two fixed blocks that are separated from each other. The lifting block is located between the two fixed blocks, and the fixed block is fixedly installed on the frame of the lithium battery winding equipment.

[0012] As a preferred solution of the device of the present invention, a plurality of lifting steps are arranged in sequence on the surface of the lifting block, and the core rod is carried and moved by the lifting steps. The surface of the fixed block is provided with fixed steps, and the fixed steps are arranged in sequence.

[0013] As a preferred solution of the equipment of the present invention, the mandrel handling and loading mechanism includes a first servo transmission mechanism, a rodless cylinder, a rotating cylinder, and a mandrel clamping cylinder. The first servo transmission mechanism drives the rodless cylinder to move forward and backward, the rodless cylinder drives the rotating cylinder to move up and down, the rotating cylinder drives the mandrel clamping cylinder to rotate, and the mandrel clamping cylinder clamps the mandrel.

[0014] As a preferred embodiment of the equipment of the present invention, the winding needle includes A winding needle and B winding needle, the front end of the A winding needle is provided with a telescopic rod, the front end of the B winding needle is provided with a hollow column for the telescopic rod to extend into, and a plurality of expansion components are provided between the telescopic rod and the hollow column, each expansion component includes a tightening sliding ring, an expansion sliding block and an expansion block, the tightening sliding ring is installed on the outer peripheral side of the telescopic rod, the tightening sliding ring is provided with an inclined sliding groove, the inner end of the expansion sliding block is slid into the inclined sliding groove, the outer end of the expansion sliding block is connected to the expansion block, the hollow column is provided with a movable groove, the expansion block is located in the movable groove, and when the telescopic rod drives the tightening sliding ring to move; the tightening sliding ring drives the expansion block to extend or retract into the movable groove through the cooperation of the inclined sliding groove and the expansion sliding block, and the inner wall of the expansion core rod is tightened when the expansion block extends.

[0015] As a preferred solution of the device of the present invention, a large circular spacer sleeve and a small circular spacer sleeve are installed on the outer circumference of the telescopic rod. The large circular spacer sleeve separates two adjacent tightening sliding rings, and the small circular spacer sleeve prevents the tightening sliding ring at the front end from falling out.

[0016] As a preferred solution of the device of the present invention, a limit screw is installed on the front thread of the telescopic rod, and the limit screw presses the limit small circular ring spacer sleeve.

[0017] As a preferred embodiment of the equipment of the present invention, the diaphragm hot cutting device includes a second servo transmission mechanism and a movable plate. The second servo transmission mechanism drives the movable plate to move forward and backward. The movable plate is equipped with a diaphragm pressing mechanism, a diaphragm hot melting mechanism, and a diaphragm hot cutting mechanism. The diaphragm pressing mechanism is used to press the diaphragm, the diaphragm hot cutting mechanism is used to cut the pressed diaphragm, and the diaphragm hot melting mechanism is used to heat and melt the cut diaphragm.

[0018] As a preferred embodiment of the equipment of the present invention, the diaphragm pressing mechanism includes a first seat body, a first connecting rod, a first pressure roller seat, an upper diaphragm pressure roller, a second seat body, a second connecting rod, a second pressure roller seat, and a lower diaphragm pressure roller. The first seat body is installed on the movable plate and is located at the upper position. The front of the first seat body is connected to the first connecting rod, and the front of the first connecting rod is connected to the first pressure roller seat. The diaphragm pressure roller is rotatably installed in the pressure roller seat. The second seat body is installed on the movable plate and is located at the lower position. The front of the second seat body is connected to the second connecting rod, and the front of the second connecting rod is connected to the second pressure roller seat. The lower diaphragm pressure roller is rotatably installed in the second pressure roller seat, and the upper diaphragm pressure roller is closer to the front than the lower diaphragm pressure roller.

[0019] A lithium battery winding production process, using the above-mentioned lithium battery winding production equipment to manufacture battery cells, comprises the following steps:

[0020] ① Place multiple hollow core rods into the automatic core rod loading mechanism, which separates a single core rod to the discharge position;

[0021] ② The mandrel handling and loading mechanism drives a single mandrel to be transported and loaded into the winding needle at the loading and unloading station, and the winding needle expands the inner wall of the mandrel;

[0022] ③ The winding needle turret rotates to switch the winding needle to the winding station;

[0023] ④ The diaphragm hot cutting device cuts off the diaphragm at the winding station and sticks the diaphragm to the outer peripheral side of the mandrel;

[0024] ⑤ The winding needle rotates with the core rod to complete the initial forming of the battery core;

[0025] ⑥ The winding needle turret rotates to make the winding needle carry the battery cell to the finishing station, and the tail of the battery cell is covered with adhesive tape to prevent it from spreading;

[0026] ⑦ The winding needle turret rotates to make the winding needle carry the battery cell to the loading and unloading station. The winding needle contracts to release the core rod, and the unloading mechanism takes the wound battery cell out of the winding needle.

[0027] The advantages and disadvantages of the prior art process structure and the process structure of the present invention are compared as follows:

[0028] 1. The traditional process uses hot cutting or cold cutting to cut the diaphragm, while this patent uses the method of cutting after the cutter is heated, which can not only meet the advantages of high diaphragm cutting efficiency and stable cutting, but also ensure the neat cutting edge of the diaphragm.

[0029] 2. The traditional process inserts the cut diaphragm into the gap between winding needle A and winding needle B, and then performs pre-rotation and diaphragm pulling. However, the patented process heats the hot melt knife to a certain temperature after the core rod is installed, and then the hot melt knife presses the diaphragm onto the core rod, so that the diaphragm is melted and adhered to the core rod. The core rod then rotates to complete the diaphragm pre-rotation and diaphragm pulling, and the core rod can be smoothly integrated into the battery cell, laying the foundation for the integrity of the battery cell process.

[0030] 3. The traditional process uses the self-rotation of the winding needle to complete the forming of the battery cell. Therefore, the size of the center hole of the battery cell is the same as the diameter of the winding needle. In order to ensure that the size of the center hole of the battery cell remains unchanged before unloading, a hot hole process structure is usually added to the battery cell unloading pull belt to preheat and shape the center hole of the battery cell to ensure that the center hole of the battery cell will not be deformed too much due to handling and clamping (if the extrusion pressure of the battery cell is too large, the center hole will also be deformed too much). This patent uses the core rod to be put on the winding needle, and the self-rotation of the winding needle drives the core rod to rotate to complete the battery cell forming. Therefore, the size of the center hole of the battery cell is the same as the size of the center hole of the core rod, and the core rod structure is firm and will not be deformed due to extrusion and clamping of the battery cell. Therefore, there is no hot hole process structure on the battery cell unloading pull belt, and the process before the battery cell is unloaded will be simpler, the strength of the entire battery cell will be stronger, and the appearance and internal dimensions will be more stable, providing the battery cell with strong physical properties.

[0031] 4. The traditional process uses the mutual pulling and rotation of winding needle A and winding needle B to achieve the pre-rotation of the diaphragm, battery cell forming and battery cell unloading; while this patent is to move the core rod to the winding needle, and then pull the A needle to make the core rod expand and tighten on the winding needle, and rotate the winding needle to complete the battery cell forming. When unloading, push the A winding needle forward to relax the core rod on the winding needle, so that the unloading claw can directly clamp the battery cell unloading. It can be seen that the traditional clamp unloading is to clamp the formed battery cell directly from the winding needle. The winding needle is pulled out from the center hole of the battery cell by hard pulling, and the unloading claw can be moved away from the winding needle. This will cause the formed battery cell to have a spiral protrusion on the end face of the battery cell after the needle is hard pulled out, resulting in scrapped products. In this patent, the formed battery cell can become relaxed on the winding needle when unloading, and there is no situation of hard pulling out the needle, which avoids the scrapped products of the formed battery cell with spiral protrusion on the end face, and also reduces the difficulty of debugging the machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a process flow chart of the prior art;

[0033] Figure 2 It is a structural diagram of the device of the present invention;

[0034] Figure 3 is a three-dimensional diagram of the automatic mandrel loading mechanism of the present invention;

[0035] Figure 4 It is a stereoscopic diagram of the automatic mandrel loading mechanism of the present invention from another perspective;

[0036] Figure 5 It is a front view of the automatic mandrel loading mechanism of the present invention;

[0037] Figure 6 It is a working flow chart of the automatic mandrel loading mechanism of the present invention;

[0038] Figure 7 It is a three-dimensional diagram of the mandrel handling and loading mechanism of the present invention;

[0039] Figure 8 is an exploded view of the winding needle of the present invention;

[0040] Fig. 9 This is a cross-sectional view of the structure of the winding needle A of the present invention;

[0041] Fig.10 It is a three-dimensional diagram of the A winding needle and the expansion assembly of the present invention;

[0042] Fig.11 is a three-dimensional diagram of the B winding needle of the present invention;

[0043] Fig.12 It is a structural cross-sectional view of the B winding needle of the present invention;

[0044] Fig.13 is a three-dimensional diagram of the expansion assembly of the present invention;

[0045] Fig.14 It is a needle rolling workflow diagram of the present invention.

[0046] Fig.15 is a perspective view of the diaphragm hot cutting device of the present invention;

[0047] Fig.16 is a stereoscopic diagram of the diaphragm hot cutting device of the present invention from another perspective;

[0048] Fig.17 is a front view of the diaphragm hot cutting device of the present invention;

[0049] Fig.18 It is a schematic diagram of the working principle of the diaphragm hot cutting device of the present invention. DETAILED DESCRIPTION

[0050] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings:

[0051] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the positions or elements referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present invention.

[0052] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] like Figure 2As shown, a lithium battery winding production equipment includes an automatic mandrel loading mechanism 1, a mandrel transporting and loading mechanism 2, a winding needle turret 3, a winding needle 4, a diaphragm hot cutting device 5 and a feeding mechanism 6. A plurality of hollow mandrels 7 are placed in the automatic mandrel loading mechanism 1. The automatic mandrel loading mechanism 1 separates a single mandrel 7. The winding needle turret 3 is provided with a loading and unloading station A, a winding station B and a finishing station C. The loading and unloading station A, the winding station B and the finishing station C surround the winding needle turret. 3 is distributed on the center circumference, three winding needles 8 are installed in front of the winding needle turret 3, and the three winding needles 8 correspond to the loading and unloading stations A, the winding station B, and the finishing station C respectively. The core rod conveying and loading mechanism 2 drives the core rod 7 to be loaded into the winding needle 8 at the loading and unloading stations, the diaphragm hot cutting device 5 cuts the diaphragm at the winding station and sticks the diaphragm to the core rod 7, the unloading mechanism 6 takes the wound battery cell out of the winding needle, and there is a glue sticking and finishing mechanism at the finishing station C for glue sticking. This is the prior art.

[0054] like Figure 3-6 As shown, the automatic core rod loading mechanism 1 includes a base 11, a transverse movement component 12, a lifting component 13, a lifting block 14, a core rod storage box 15 and a fixed block 16. The transverse movement component 12 is installed above the base 11, and the lifting component 13 is installed at the output end of the transverse movement component 12. The lifting block 14 is installed at the output end of the lifting component 13. The transverse movement component 12 and the lifting component 13 cooperate with each other to drive the lifting block 4 to move forward and backward and up and down. A plurality of core rods are installed in the core rod storage box 14. The bottom surface of the core rod storage box 15 is an inclined surface. An opening is set at one end of the core rod storage box 15, and the opening can only allow one core rod 7 to pass through at a time; therefore, it can ensure that the materials are fed separately one by one, and the lifting block 14 is connected at the opening. The core rods in the core rod storage box 15 roll down to the lifting block 14. There are two fixed blocks 16 that are separated, and the lifting block 14 is located between the two fixed blocks 16. The fixed block 16 is fixedly installed on the frame of the lithium battery winding equipment.

[0055] Specifically, the surface of the lifting block 14 is provided with a plurality of lifting steps 141, which are arranged in ascending order, and the core rod 7 is carried and moved by the lifting steps 41. The surface of the fixed block 16 is provided with fixed steps 161, which are arranged in ascending order, and the fixed steps 161 are used to temporarily carry the core rod. The lifting steps 141 are lower than the fixed steps 161 when they are in a low position, and are higher than the fixed steps 161 when they are in a high position. In this embodiment, the lifting steps 141 and the fixed steps 161 are respectively 3 for illustration, and the specific number can be increased or decreased. The lifting assembly drives the lifting block 14 above, and the leftmost lifting step 141 rises so that the core rod is not at the same horizontal position as the opening. Then the transverse movement assembly drives the lifting block 14 to move right, and the lifting block 14 moves forward with the core rod 7. The lifting block 14 and the fixed block 16 are offset by one core rod position. The lifting assembly drives the lifting block 4 to move downward, and both ends of the core rod are carried on the leftmost fixed step 61 so that the core rod will not move with the lifting assembly. The jacking block 4 descends, and the transverse movement assembly drives the jacking block 4 to move backward and reset. Then the lifting assembly drives the top of the jacking block 4 repeatedly, and the second jacking step 41 rises so that the core rod originally on the leftmost fixed step 61 is supported on the second jacking step 41. Then the transverse movement assembly drives the jacking block 4 to move forward. After that, the lifting assembly drives the jacking block 4 to move downward. Both ends of the core rod are supported on the second fixed step 61 so that the core rod will not descend with the jacking block 4. The transverse movement assembly drives the jacking block 4 to move forward and reset. And so on, the core rod is gradually sent out.

[0056] Specifically, the bottom surfaces of the lifting step 141 and the fixed step 161 are inclined surfaces, so that the left side is higher and the right side is lower, which can prevent the core rod 7 from falling out. The transverse movement assembly includes a transverse movement cylinder 121, a transverse movement plate 122, a slider 123, and a slide rail 124. The transverse movement cylinder 121 is fixedly installed on the base 11. The piston rod of the transverse movement cylinder 121 extends laterally and connects the transverse movement plate 122. The slider 123 is installed at the bottom of the transverse movement plate 122. The slider 123 is slidably connected to the slide rail 124. The slide rail 124 is fixedly installed on the base 11. The transverse movement cylinder 121 drives the transverse movement plate 122 to move left and right under the guidance of the slider 123 and the slide rail 124.

[0057] Specifically, the lifting assembly includes a lifting cylinder 131, a guide rod 132, and a guide sleeve 133. The piston rod of the lifting cylinder 131 extends upward and is connected to the lifting step 14. The guide rod 132 is installed on the front and rear sides of the bottom of the lifting step 14. The guide rod 132 is slidably connected to the guide sleeve 133. The guide sleeve 133 is fixedly installed on the transverse plate 122. The lifting cylinder 131 drives the lifting step 14 to move up and down.

[0058] Working principle of the automatic mandrel loading mechanism 1: ① Initial waiting position: the mandrel in the mandrel storage box 15 rolls down to the jacking block 14; ② Mandrel lifting: the lifting component drives the top of the jacking block 14, and the leftmost jacking step 141 rises so that the mandrel is not at the same horizontal position as the opening; ③ Mandrel moves right: the transverse movement component drives the jacking block 14 to move right, and the jacking block 14 moves right with the mandrel 7; ④ Mandrel drops into place: the lifting component drives the jacking block 14 to move downward, and both ends of the mandrel are supported on the fixed steps 161 so that the mandrel will not drop with the jacking block 14, and the mandrel drops into place; ⑤ Reset: the transverse movement component drives the jacking block 14 to move left and reset, and the above steps are repeated continuously to ensure that the mandrel is stably and quickly delivered.

[0059] like Figure 7 As shown, the mandrel handling and loading mechanism 2 includes a first servo transmission mechanism 21, a rodless cylinder 22, a rotating cylinder 23, and a mandrel clamping cylinder 24. The first servo transmission mechanism 21 drives the rodless cylinder 22 to move forward and backward, the rodless cylinder 22 drives the rotating cylinder 23 to move up and down, the rotating cylinder 23 drives the mandrel clamping cylinder 24 to rotate, and the mandrel clamping cylinder 24 clamps the mandrel 7. The first servo transmission mechanism 21, the rodless cylinder 22, the rotating cylinder 23, and the mandrel clamping cylinder 24 cooperate with each other to transport the mandrel from the discharge position of the automatic mandrel loading mechanism 1 to the winding needle.

[0060] like Figures 8 to 14 As shown, the winding needle 4 includes a winding needle A 41 and a winding needle B 42, wherein the front end of the winding needle A 41 is provided with a telescopic rod 43, and the front end of the winding needle B 42 is provided with a hollow column 44 for the telescopic rod 43 to extend into, and a plurality of tightening components are provided between the telescopic rod 43 and the hollow column 44, each tightening component includes a tightening sliding ring 45, an tightening sliding block 46 and a tightening block 47, and the tightening sliding ring 45 is installed on the outer peripheral side of the telescopic rod 43, and the tightening sliding ring 45 is provided with an inclined sliding groove 451, and the inner end of the tightening sliding block 46 is slidably installed in the inclined sliding groove 451, and the outer end of the tightening sliding block 46 is connected to the tightening block 47, and the hollow column 44 is provided with a movable groove 8, and the tightening block 47 is located in the movable groove 48. When the telescopic rod 43 drives the tightening sliding ring 45 to move; the tightening sliding ring 45 drives the tightening block 47 to extend or retract into the movable groove through the cooperation of the inclined sliding groove 451 and the tightening sliding block 46.

[0061] Specifically, a large circular spacer sleeve 49 and a small circular spacer sleeve 410 are installed on the outer circumference of the telescopic rod 43. The large circular spacer sleeve 49 separates two adjacent tightening sliding rings 45, and the large circular spacer sleeve 49 supports the two adjacent tightening sliding rings 45 to prevent displacement. The small circular spacer sleeve 410 prevents the front end tightening sliding ring 45 from falling out. A limiting screw 411 is installed on the front thread of the telescopic rod 43, and the limiting screw 411 presses the limiting small circular spacer sleeve 410, thereby determining the position of each tightening sliding ring 5.

[0062] Specifically, a non-circular through groove 412 is provided inside the tightening sliding ring 45, and the non-circular through groove 412 is inserted into the telescopic rod 43, and can drive the tightening sliding ring 45 to rotate when the winding needle is rolled. In addition, the front end of the inclined sliding groove 451 is high and the rear end is low, so that when the tightening sliding ring 45 moves forward and backward, the expansion block 47 moves in a direction perpendicular to the axis of the winding needle, completing the action of tightening and fixing the core rod.

[0063] Specifically, there are multiple inclined grooves 451 and they are distributed circumferentially around the central axis of the tightening sliding ring 45. In this embodiment, one tightening sliding ring 45 is provided with three inclined grooves 451. Correspondingly, one tightening sliding ring 45 is configured with three expansion sliding blocks 46 and three expansion blocks 47 to expand the inner wall of the core rod from three directions.

[0064] Specifically, the cross-sectional shape of the inclined slide groove 451 is arc-shaped, so that the tightening sliding block 46 cannot directly disengage from the inclined slide groove 451 by moving upward, and the tightening block 47 is installed integrally with the tightening sliding block 6 by means of screws 413, and the tightening block 47 is placed in the movable groove 48, and the inner diameter of the movable groove 48 is slightly larger than the tightening block 7.

[0065] like Fig.13 As shown, the working principle of the winding needle 4 is as follows: first, the telescopic rod 43 of the winding needle A 41 is extended into the hollow column of the winding needle B 42 to the front position, so that the winding needles A and B form a winding needle (at this time, the expansion block 47 is in the retracted state), and then a cylinder or other power can be used to drive the winding needle as a whole to enter the core rod (the core rod is also hollow), and then other cylinders can be used to drive the winding needle A 41 to move backward alone. When the tightening sliding ring 45 moves backward, the expansion block 47 is driven to extend out of the movable groove through the cooperation of the inclined sliding groove 451 and the expansion sliding block 46, thereby expanding the inside of the core rod to meet the production requirements.

[0066] like Figures 14 to 17 As shown, the diaphragm hot cutting device 5 includes a second servo transmission mechanism 51 and a moving plate 52. The second servo transmission mechanism 51 drives the moving plate 52 to move forward and backward. The second servo transmission mechanism 511 is a servo motor and a screw nut transmission mechanism as the prior art. A diaphragm clamping mechanism, a diaphragm hot melting mechanism, and a diaphragm hot cutting mechanism are installed on the moving plate 52. The diaphragm clamping mechanism is used to clamp the diaphragm, the diaphragm hot cutting mechanism is used to cut the compressed diaphragm, and the diaphragm hot melting mechanism is used to heat and melt the cut diaphragm.

[0067] Specifically, the diaphragm pressing mechanism 53 includes a first seat body 531, a first connecting rod 532, a first pressure roller seat 533, an upper diaphragm pressure roller 534, a second seat body 535, a second connecting rod 536, a second pressure roller seat 537, and a lower diaphragm pressure roller 538. The first seat body 531 is installed on the movable plate 2 and is located on the upper part of the movable plate 2. The front of the first seat body 531 is connected to the first connecting rod 532, and the front of the first connecting rod 532 is connected to the first pressure roller seat 533. The upper diaphragm pressure roller 534 is rotatably installed in the first pressure roller seat 533. The second seat body 535 is installed on the movable plate 1 and is located on the upper part of the movable plate 2. And it is located at the lower part of the movable plate 2, the second seat body 531 is connected to the second connecting rod 536 in front, the second connecting rod 536 is connected to the second pressure roller seat 537 in front, the lower diaphragm pressure roller 538 is rotatably installed in the second pressure roller seat 537, the upper diaphragm pressure roller 534 is closer to the front than the lower diaphragm pressure roller 538, when the second servo transmission mechanism 511 drives the movable plate 2 to move forward, the upper diaphragm pressure roller 534 presses the diaphragm at the winding needle, and the lower diaphragm pressure roller 538 cooperates with the small roller to press the diaphragm below, and the diaphragm hot melting mechanism and the diaphragm hot cutting mechanism are between the upper diaphragm pressure roller 534 and the lower diaphragm pressure roller 538.

[0068] Specifically, the diaphragm hot melt mechanism includes a hot melt cylinder 541, a hot melt moving block 542, a hot melt knife 543, and a guide rod 544. The hot melt cylinder 541 is installed in the moving plate 52, and the hot melt cylinder 541 drives the hot melt moving block 542 to move forward and backward. The hot melt knife 543 is installed on the hot melt moving block 542, and a heating rod is installed inside the hot melt knife 543. A guide rod 544 is installed behind the hot melt knife 543, and the guide rod 544 is slidably connected to the first seat body 531. The forward moving hot melt knife 543 will press the melted diaphragm onto the core rod, so that the diaphragm sticks to the core rod.

[0069] Specifically, the diaphragm hot cutting mechanism includes a hot cutting cylinder 551, a hot cutting knife seat 552 and a hot cutting knife 553. The hot cutting cylinder 551 drives the hot cutting knife seat 552 to move forward and backward. A heating rod is installed inside the hot cutting knife seat 552. The hot cutting knife 553 is installed in front of the hot cutting knife seat 552. The hot cutting cylinder 551 drives the hot cutting knife 553 to move forward to cut off the diaphragm. The upper diaphragm pressure roller 534, the hot melt knife 553, and the hot cutting knife 553 are distributed in sequence from top to bottom.

[0070] like Fig.18As shown, the working principle of the diaphragm hot cutting device 5 is as follows: first, the second servo transmission mechanism 51 drives the movable plate 52 to move forward, and the movable plate 52 drives the first seat body 531 and the second seat body 535 to move forward, and the first seat body 531 and the second seat body 535 respectively drive the upper diaphragm pressing roller 534 and the lower diaphragm pressing roller 538 to move forward and press the upper and lower diaphragms, and then the hot cutting cylinder 551 drives the hot cutting knife 553 to move forward to cut off the diaphragm, and then the hot melting cylinder 541 drives the hot melting knife 543 to move forward, and the forward moving hot melting knife 543 will press the melted diaphragm onto the core rod, so that the diaphragm sticks to the core rod, and the upper diaphragm pressing roller 534 and the lower diaphragm pressing roller 538 move backward, and the battery cell begins to be wound and formed.

[0071] A lithium battery winding production process, using the above-mentioned lithium battery winding production equipment to manufacture battery cells, comprises the following steps:

[0072] ① Place multiple hollow core rods into the automatic core rod loading mechanism, which separates a single core rod to the discharge position;

[0073] ② The mandrel handling and loading mechanism drives a single mandrel to be transported and loaded into the winding needle at the loading and unloading station, and the winding needle expands the inner wall of the mandrel;

[0074] ③ The winding needle turret rotates to switch the winding needle to the winding station;

[0075] ④ The diaphragm hot cutting device cuts off the diaphragm at the winding station and sticks the diaphragm to the outer peripheral side of the mandrel;

[0076] ⑤ The winding needle rotates with the core rod to complete the initial forming of the battery core;

[0077] ⑥ The winding needle turret rotates to make the winding needle carry the battery cell to the finishing station, and the tail of the battery cell is covered with adhesive tape to prevent it from spreading;

[0078] ⑦ The winding needle turret rotates to make the winding needle carry the battery cell to the loading and unloading station. The winding needle contracts to release the core rod, and the unloading mechanism takes the wound battery cell out of the winding needle.

[0079] The advantages and disadvantages of the prior art process structure and the process structure of the present invention are compared as follows:

[0080] 1. The traditional process uses hot cutting or cold cutting to cut the diaphragm, while this patent uses the method of cutting after the cutter is heated, which can not only meet the advantages of high diaphragm cutting efficiency and stable cutting, but also ensure the neat cutting edge of the diaphragm.

[0081] 2. The traditional process inserts the cut diaphragm into the gap between winding needle A and winding needle B, and then performs pre-rotation and diaphragm pulling. However, the patented method heats the hot melt knife to a certain temperature after the core rod is installed, and then the hot melt knife presses the diaphragm onto the core rod, so that the diaphragm is melted and adhered to the core rod. Then the core rod rotates again to complete the diaphragm pre-rotation and diaphragm pulling, and the core rod can be smoothly integrated into the battery cell, laying the foundation for the integrity of the battery cell process.

[0082] 3. The traditional process uses the self-rotation of the winding needle to complete the forming of the battery cell. Therefore, the size of the center hole of the battery cell is the same as the diameter of the winding needle. In order to ensure that the size of the center hole of the battery cell remains unchanged before unloading, a hot hole process structure is usually added to the battery cell unloading pull belt to preheat and shape the center hole of the battery cell to ensure that the center hole of the battery cell will not be deformed too much due to handling and clamping (if the extrusion pressure of the battery cell is too large, the center hole will also be deformed too much). This patent uses the core rod to be put on the winding needle, and the self-rotation of the winding needle drives the core rod to rotate to complete the battery cell forming. Therefore, the size of the center hole of the battery cell is the same as the size of the center hole of the core rod, and the core rod structure is firm and will not be deformed due to extrusion and clamping of the battery cell. Therefore, there is no hot hole process structure on the battery cell unloading pull belt, and the process before the battery cell is unloaded will be simpler, the strength of the entire battery cell will be stronger, and the appearance and internal dimensions will be more stable, providing the battery cell with strong physical properties.

[0083] 4. The traditional process uses the mutual pulling and rotation of winding needle A and winding needle B to achieve the pre-rotation of the diaphragm, battery cell forming and battery cell unloading; while this patent is to move the core rod to the winding needle, and then pull the A needle to make the core rod expand and tighten on the winding needle, and rotate the winding needle to complete the battery cell forming. When unloading, push the A winding needle forward to relax the core rod on the winding needle, so that the unloading claw can directly clamp the battery cell unloading. It can be seen that the traditional clamp unloading is to clamp the formed battery cell directly from the winding needle. The winding needle is pulled out from the center hole of the battery cell by hard pulling, and the unloading claw can be moved away from the winding needle. This will cause the formed battery cell to have a spiral protrusion on the end face of the battery cell after the needle is hard pulled out, resulting in scrapped products. In this patent, the formed battery cell can become relaxed on the winding needle when unloading, and there is no situation of hard pulling out the needle, which avoids the scrapped products of the formed battery cell with spiral protrusion on the end face, and also reduces the difficulty of debugging the machine.

[0084] The core rod is first placed on the winding needle, and then the pole piece and diaphragm are wound on the core rod to finally complete the final forming of the battery cell. This can not only ensure the size of the center hole after the battery cell is formed, but also ensure that the center hole of the battery cell is not easily deformed during transportation, clamping and extrusion, which guarantees that the center hole of the battery cell can improve the performance of the battery cell.

[0085] The above content is a further detailed description of the present invention in combination with specific preferred implementation modes. It cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as belonging to the protection scope of the present invention.

Claims

1. A lithium battery winding production equipment, characterized in that: It includes an automatic core rod loading mechanism, a core rod conveying and loading mechanism, a winding needle turret, a winding needle, a diaphragm hot cutting device and a feeding mechanism. Multiple hollow core rods are placed in the automatic core rod loading mechanism. The automatic core rod loading mechanism separates a single core rod. The winding needle turret is provided with loading and unloading stations, a winding station and a finishing station. The loading and unloading stations, the winding station and the finishing station are distributed around the central circumference of the winding needle turret. Three winding needles are installed in front of the winding needle turret. The three winding needles correspond to the loading and unloading stations, the winding station and the finishing station respectively. The core rod conveying and loading mechanism drives the core rod to be loaded into the winding needle at the loading and unloading station. The diaphragm hot cutting device cuts off the diaphragm at the winding station and sticks the diaphragm to the core rod. The feeding mechanism takes the wound battery cell out of the winding needle.

2. A lithium battery winding production equipment according to claim 1, characterized in that: The automatic mandrel loading mechanism includes a base, a transverse movement assembly, a lifting assembly, a lifting block, a mandrel storage box and a fixed block. The transverse movement assembly is installed above the base, the lifting assembly is installed at the output end of the transverse movement assembly, and the lifting block is installed at the output end of the lifting assembly. The transverse movement assembly and the lifting assembly cooperate with each other to drive the lifting block to move forward and backward and up and down. A plurality of mandrels are installed inside the mandrel storage box. The bottom surface of the mandrel storage box is an inclined surface. An opening is arranged at one end of the mandrel storage box and the opening is connected to the lifting block. The mandrels in the mandrel storage box roll down to the lifting block. There are two fixed blocks that are separated and the lifting block is located between the two fixed blocks. The fixed block is fixedly installed on the frame of the lithium battery winding equipment.

3. A lithium battery winding production equipment according to claim 2, characterized in that: A plurality of lifting steps are arranged on the surface of the lifting block, the lifting steps are arranged in ascending order, the core rod is carried and moved by the lifting steps, and a fixed step is arranged on the surface of the fixed block, the fixed step is arranged in ascending order.

4. The lithium battery winding production equipment according to claim 1, characterized in that: The mandrel handling and loading mechanism includes a first servo transmission mechanism, a rodless cylinder, a rotating cylinder, and a mandrel clamping cylinder. The first servo transmission mechanism drives the rodless cylinder to move forward and backward, the rodless cylinder drives the rotating cylinder to move up and down, the rotating cylinder drives the mandrel clamping cylinder to rotate, and the mandrel clamping cylinder clamps the mandrel.

5. The lithium battery winding production equipment according to claim 1, characterized in that: The winding needle includes A winding needle and B winding needle, the front end of A winding needle is provided with a telescopic rod, the front end of B winding needle is provided with a hollow column for the telescopic rod to extend into, a plurality of expansion components are provided between the telescopic rod and the hollow column, each expansion component includes a tightening sliding ring, an expansion sliding block and an expansion block, the tightening sliding ring is installed on the outer peripheral side of the telescopic rod, the tightening sliding ring is provided with an inclined sliding groove, the inner end of the expansion sliding block is slid into the inclined sliding groove, the outer end of the expansion sliding block is connected to the expansion block, the hollow column is provided with a movable groove, the expansion block is located in the movable groove, and when the telescopic rod drives the tightening sliding ring to move; the tightening sliding ring drives the expansion block to extend or retract into the movable groove through the cooperation of the inclined sliding groove and the expansion sliding block, and the inner wall of the expansion core rod is tightened when the expansion block extends.

6. The lithium battery winding production equipment according to claim 5, characterized in that: A large circular spacer sleeve and a small circular spacer sleeve are installed on the outer circumference of the telescopic rod. The large circular spacer sleeve separates two adjacent sleeve-tightening sliding rings, and the small circular spacer sleeve prevents the frontmost sleeve-tightening sliding ring from falling out.

7. The lithium battery winding production equipment according to claim 5, characterized in that: A limit screw is installed on the front thread of the telescopic rod, and the limit screw presses the small limit ring spacer sleeve.

8. The lithium battery winding production equipment according to claim 1, characterized in that: The diaphragm hot cutting device includes a second servo transmission mechanism and a movable plate. The second servo transmission mechanism drives the movable plate to move forward and backward. The movable plate is equipped with a diaphragm pressing mechanism, a diaphragm hot melting mechanism, and a diaphragm hot cutting mechanism. The diaphragm pressing mechanism is used to press the diaphragm, the diaphragm hot cutting mechanism is used to cut the pressed diaphragm, and the diaphragm hot melting mechanism is used to heat and melt the cut diaphragm.

9. The lithium battery winding production equipment according to claim 1, characterized in that: The diaphragm pressing mechanism includes a first seat body, a first connecting rod, a first pressure roller seat, an upper diaphragm pressure roller, a second seat body, a second connecting rod, a second pressure roller seat, and a lower diaphragm pressure roller. The first seat body is installed on the movable plate and is located in the upper position. The front of the first seat body is connected to the first connecting rod, and the front of the first connecting rod is connected to the first pressure roller seat. The diaphragm pressure roller is rotatably installed in the pressure roller seat. The second seat body is installed on the movable plate and is located in the lower position. The front of the second seat body is connected to the second connecting rod, and the front of the second connecting rod is connected to the second pressure roller seat. The lower diaphragm pressure roller is rotatably installed in the second pressure roller seat, and the upper diaphragm pressure roller is closer to the front than the lower diaphragm pressure roller.

10. A lithium battery winding production process, characterized in that: Using the lithium battery winding production equipment described in any one of claims 1 to 9 to manufacture battery cells, The following steps are included: ① Place multiple hollow core rods into the automatic core rod loading mechanism, which separates a single core rod to the discharge position; ② The mandrel handling and loading mechanism drives a single mandrel to be transported and loaded into the winding needle at the loading and unloading station, and the winding needle expands the inner wall of the mandrel; ③ The winding needle turret rotates to switch the winding needle to the winding station; ④ The diaphragm hot cutting device cuts off the diaphragm at the winding station and sticks the diaphragm to the outer peripheral side of the mandrel; ⑤ The electrode is fed in, and the winding needle rotates with the core rod to complete the initial forming of the battery cell; ⑥ The winding needle turret rotates to make the winding needle carry the battery cell to the finishing station, and the tail of the battery cell is covered with adhesive tape to prevent it from spreading; ⑦ The winding needle turret rotates to make the winding needle carry the battery cell to the loading and unloading station. The winding needle contracts to release the core rod, and the unloading mechanism takes the wound battery cell out of the winding needle.

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