Pole piece rubberizing process, pole piece rubberizing mechanism and winding equipment

Abstract

The invention provides a pole piece rubberizing process, a pole piece rubberizing mechanism and winding equipment, and relates to the technical field of lithium battery processing, the pole piece rubberizing mechanism of the pole piece rubberizing process is used for rubberizing a pole piece, the pole piece rubberizing mechanism is located on the side of a winding mechanism, and a plurality of guide rollers are arranged between the pole piece rubberizing mechanism and the winding mechanism; and the conveying stroke of the pole piece is increased. The winding equipment comprises a pole piece rubberizing mechanism and a winding mechanism, the pole piece rubberizing mechanism is arranged on a pole piece conveying channel, the winding mechanism comprises a mandrel and a rotating tower rotating around the mandrel, the pole piece rubberizing mechanism is located on the side of the rotating tower, the rotating tower is provided with a winding station, a rubberizing station and a discharging station are switched in sequence, and when a battery cell is wound at the winding station, the rubberizing station and the discharging station are switched in sequence. The pole piece rubberizing mechanism conveys a rubberized pole piece to the winding station, the pole piece rubberizing mechanism is located on the side of the rotating tower, so that carbon powder or metal dust cannot fall into a winding core which is being wound, and the pole piece before winding is cut off and rubberized through the pole piece rubberizing mechanism.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery processing, and in particular to a pole piece gluing process, a pole piece gluing mechanism and a winding device. Background Art

[0002] With the development of lithium batteries, the size of lithium battery products is not fixed, but the higher the requirements for product safety performance, the higher the process precision of winding equipment for making battery products. The winding of existing lithium battery cells is mainly completed by battery cell winding machines. Battery cell winding machines form lithium battery cells by stacking, winding, and affixing termination glue on the positive electrode sheet, negative electrode sheet, and diaphragm in a certain order. In order to increase the production speed of battery cell winding machines, existing battery cell winding machines generally use three-station winding heads.

[0003] Before the winding needle winds the battery cell, the left and right film roller assemblies above the winding needle must be closed first, and the two winding needles pass through the vertical diaphragm. Then the head of the electrode sheet needs to be fed and the winding needle starts to roll. Before the battery cell is rolled, the electrode sheet must be cut at the feeding position. After the battery cell is wound, change the work station and cut the diaphragm.

[0004] In the prior art, the pole piece can only be rolled up on a single roll mechanism near the feeding mechanism before winding. The pole piece needs to be slowed down and cut off. The pole piece is cut above the winding. Carbon powder or metal dust cannot be sucked away in time by the vacuum cleaner and falls into the winding core, affecting the quality and performance of the battery cell. The pole piece is cut without glue protection and has burrs. The burrs even exceed the standard during the production process, and the burrs pierce the diaphragm, causing a short circuit in the battery cell. Summary of the invention

[0005] In view of this, one of the objects of the present invention is to provide a pole piece gluing process to solve the problems in the prior art that a single pole piece is rolled near a feeding mechanism before winding, the pole piece needs to be slowed down and cut, and the pole piece is cut above the winding, carbon powder or metal dust cannot be sucked away in time by the vacuum and falls into the winding core, affecting the quality and performance of the battery cell, and the pole piece is cut without glue protection, burrs are present, and even the burrs exceed the standard during the production process, and the burrs pierce the diaphragm, causing the battery cell to short-circuit.

[0006] A second object of the present invention is to provide a pole piece gluing mechanism.

[0007] The third object of the present invention is to provide a winding device including a pole piece gluing mechanism.

[0008] In order to achieve one of the above purposes, an embodiment of the present invention provides a pole piece gluing process, including a pole piece gluing mechanism for gluing pole pieces, the pole piece gluing mechanism is located on the side of a winding mechanism, and a plurality of guide rollers are provided between the pole piece gluing mechanism and the winding mechanism, including the following steps:

[0009] Step S1: The electrode is fed, the cutter cuts and cuts the electrode, and the tail of the previous electrode is rolled and glued;

[0010] Step S2: The clamp of the film feeding mechanism opens and moves backward, and the film feeding mechanism feeds the film downward to roll glue on the head of the next electrode.

[0011] In order to achieve the second of the above-mentioned purposes, an embodiment of the present invention provides a pole piece gluing mechanism, including a surface rubber material roll, a sheet feeding assembly, a cutter assembly, a pole piece main drive belt assembly and a gluing assembly, wherein the sheet feeding assembly, the cutter assembly, the pole piece main drive belt assembly and the gluing assembly are arranged sequentially from top to bottom, and the gluing assembly and the surface rubber material roll are both arranged on both sides of the pole piece, and the film of the surface rubber material roll is transported to the gluing assembly, and when the pole piece is cut off by the cutter assembly, its tail is glued through the gluing assembly.

[0012] Optionally, the glue sticking assembly includes a support frame, a horizontal movement drive motor, a spare rubber wheel and a spare rubber wheel drive motor, the spare rubber wheel is installed on the support frame, the horizontal movement drive motor and the spare rubber wheel drive motor are simultaneously connected to the spare rubber wheel drive, and are used to make the spare rubber wheel move horizontally and rotate.

[0013] Optionally, a glue pressing swing arm is provided on the spare rubber wheel, and the glue pressing swing arm is drivingly connected to the glue pressing swing arm driving motor.

[0014] Optionally, a film cutter is also provided on the support frame.

[0015] In order to achieve the third of the above-mentioned purposes, an embodiment of the present invention provides a winding device, comprising any of the above-mentioned electrode gluing mechanisms, and also comprising a winding mechanism, wherein the electrode gluing mechanism is arranged on the conveying channel of the electrode, and the winding mechanism comprises a core shaft and a turret rotating around the core shaft, and the electrode gluing mechanism is located on the side of the turret, and the turret is provided with a winding station, a gluing station and a unloading station, and the winding station, the gluing station and the unloading station are switched sequentially, and when the winding station rolls the battery cell, the electrode gluing mechanism conveys the glued electrode to the winding station.

[0016] Optionally, a first film-joining roller assembly and a second film-joining roller assembly are provided on the turret near the winding station, and the clamping end of the first film-joining roller assembly and the clamping end of the second film-joining roller assembly move toward or away from each other.

[0017] Optionally, it also includes a CCD detector, a control module and a correction component, and the control module is electrically connected to the CCD detector and the correction component at the same time. The CCD detector detects the alignment of the pole piece and the diaphragm. If the pole piece and the diaphragm are not aligned, the CCD detector transmits a signal to the control module, and the control module controls the correction component to correct the pole piece or the diaphragm.

[0018] Optionally, the CCD detector includes a first CCD detector for detecting the alignment of the right pole piece and the upper diaphragm, a second CCD detector for detecting the alignment of the left pole piece and the lower diaphragm, and a third CCD detector for detecting the alignment of the right pole piece and the upper diaphragm at the tail of each battery cell.

[0019] Optionally, the gluing station is provided with a gluing roller and a finishing roller, and the finishing roller includes at least one and is arranged in the circumference of the gluing station, and the gluing roller is also arranged in the circumference of the gluing station.

[0020] The pole piece gluing process and pole piece gluing mechanism provided by the present invention have the following technical effects compared with the prior art:

[0021] This electrode gluing process includes an electrode gluing mechanism, which is used to glue the electrode. The electrode gluing mechanism is located on the side of the winding mechanism, and a plurality of guide rollers are provided between the electrode gluing mechanism and the winding mechanism, thereby increasing the conveying stroke of the electrode. After the electrode is cut off, its tail and the head of the next electrode can be rolled with glue in time. Since the conveying stroke of the electrode is large enough, there is no need to slow down and cut it off. Moreover, since the electrode cutting is located on the side of the winding, carbon powder or metal dust will not fall into the winding core being wound. In addition, since the electrode is protected by gluing, burrs are avoided, thereby improving the quality of the battery cell.

[0022] The winding device provided by the present invention comprises a pole piece gluing mechanism and a winding mechanism. The pole piece gluing mechanism is arranged on a conveying channel of the pole piece. The winding mechanism comprises a core shaft and a turret rotating around the core shaft. The pole piece gluing mechanism is located on the side of the turret. The turret is provided with a winding station, a gluing station and a material unloading station. The winding station, the gluing station and the material unloading station are switched in sequence. When the winding station winds the battery cell, the pole piece gluing mechanism conveys the glued pole piece to the winding station. Since the pole piece gluing mechanism is located on the side of the turret, carbon powder or metal dust will not fall into the winding core being wound. The pole piece before winding is cut and glued by the pole piece gluing mechanism, burrs are avoided, and the quality of the battery cell is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 It is a schematic diagram of the first state structure of a preferred embodiment of the winding device of the present invention;

[0025] Figure 2 yes Figure 1 A schematic diagram of the structure of the winding device in the second state;

[0026] Figure 3 yes Figure 2 Structural diagram of the middle electrode gluing mechanism;

[0027] Figure 4 yes Figure 2 Schematic diagram of the structure of the winding mechanism.

[0028] in, Figure 1-Figure 4 :

[0029] 1. Winding mechanism; 11. Turret; 12. Mandrel; 121. Pressing roller; 13. Winding station; 14. Gluing station; 141. Gluing roller; 142. Finishing roller; 15. Unloading station; 161. First film-joining roller assembly; 162. Second film-joining roller assembly; 171. First CCD detector; 172. Second CCD detector; 173. Third CCD detector; 181. Upper diaphragm deviation correction assembly; 182. Lower diaphragm deviation correction assembly; 183. Left pole piece deviation correction assembly; 184. Right pole piece deviation correction assembly;

[0030] 2. Pole piece gluing mechanism; 21. Surface glue material roll; 22. Sheet feeding assembly; 23. Cutter assembly; 24. Pole piece main drive belt assembly; 25. Gluing assembly; 251. Support frame; 252. Horizontal moving drive motor; 253. Spare rubber wheel; 254. Spare rubber wheel drive motor; 255. Glue pressing swing arm; 256. Glue pressing swing arm drive motor; 257. Film cutter. DETAILED DESCRIPTION

[0031] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0032] Based on the defects in the prior art, the following Figure 1-4 The winding apparatus of the present invention will be described in detail.

[0033] like Figure 1 and Figure 2 FIG. 1 is a schematic diagram of a preferred embodiment of a winding device according to the present invention, wherein Figure 1 The state of the battery cell is needle winding. Figure 2 It is the final state of gluing.

[0034] The winding device of this embodiment includes a winding mechanism 1 and a pole piece gluing mechanism 2. The pole piece roll, the lower diaphragm roll, the upper diaphragm roll and the pole piece roll are arranged in sequence and fed into the winding mechanism 1 at the same time. The pole piece and the diaphragm are wound by a winding needle in the winding mechanism 1. The pole piece and the diaphragm are guided by guide rollers during the winding process. The pole piece gluing mechanism 2 includes two, which are respectively located on the conveying channel of the pole piece to the winding mechanism 1; Figure 4 As shown, the winding mechanism 1 includes a core shaft 12 and a turret 11 rotating around the core shaft 12, and the turret 11 is provided with a winding station 13, a gluing station 14 and a blanking station 15 arranged in a clockwise direction. The three stations are distributed on a circle centered on the core shaft 12, and the angle between two stations is 120 degrees, so that it can be ensured that the turret 11 can switch to another station each time it rotates the same angle, which is convenient for control.

[0035] When the winding station 13 winds the battery cell, the electrode gluing mechanism 2 transports the glued electrode to the winding station 13. The present invention adopts a large-surface gluing method to glue the electrode. Since the electrode gluing mechanism 2 is located on the side of the turret 11, carbon powder or metal dust will not fall into the winding core. The electrode gluing mechanism 2 is used to cut and glue the electrode before winding, which avoids burrs and improves the quality of the battery cell.

[0036] like Figure 1 and Figure 2 As shown, the first film roller assembly 161 and the second film roller assembly 162 are provided on the turret 11 near the winding station 13. The first film roller assembly 161 and the second film roller assembly 162 are distributed on both sides of the stacked electrode sheets and diaphragms, one on the left and one on the right, that is, the clamping end of the first film roller assembly 161 and the clamping end of the second film roller assembly 162 move towards or away from each other, and in the process of the first film roller assembly 161 and the second film roller assembly 162 approaching each other, the stacking effect on the electrode sheets and the diaphragms is further enhanced.

[0037] Among them, multiple guide rollers can be provided on the first film roller assembly 161 or the second film roller assembly 162. The guide rollers play a guiding role during the transportation of the lower diaphragm or the upper diaphragm. At the same time, the guide rollers can also increase the distance between the upper diaphragm material roll and the lower diaphragm material roll and the turret 11, thereby increasing the transportation distance of the diaphragm before winding, thereby providing more operating time for winding.

[0038] In this embodiment, only the conveying passage of the lower diaphragm roll is provided with a guide roller, and no guide roller is provided on the conveying passage of the upper diaphragm roll.

[0039] In order to increase the alignment of the pole piece and the diaphragm during the transportation process, the winding equipment of the present invention also includes a CCD detector, a control module and a correction component. The CCD detector is a camera. The control module is electrically connected to the CCD detector and the correction component at the same time. The CCD detector detects the alignment of the pole piece and the diaphragm. If the pole piece and the diaphragm are not aligned, the CCD detector transmits a signal to the control module, and the control module controls the correction component to correct the pole piece or the diaphragm.

[0040] Specifically, Figure 2 As shown, the CCD detector includes a first CCD detector 171, a second CCD detector 172 and a third CCD detector 173. The first CCD detector 171 is used to detect the alignment of the right pole piece and the upper diaphragm, the second CCD detector 172 is used to detect the alignment of the left pole piece and the lower diaphragm, and the third CCD detector 173 is used to detect the alignment of the right pole piece and the upper diaphragm at the tail of each battery cell.

[0041] The deflection correction assembly includes an upper diaphragm deflection correction assembly 181, a lower diaphragm deflection correction assembly 182, a left pole piece deflection correction assembly 183 and a right pole piece deflection correction assembly 184. The upper diaphragm deflection correction assembly 181 is located on the conveying channel of the upper diaphragm roll, the lower diaphragm deflection correction assembly 182 is located on the conveying channel of the lower diaphragm roll, the left pole piece deflection correction assembly 183 is located on the conveying channel of the pole piece roll on the left side, and the right pole piece deflection correction assembly 184 is located on the conveying channel of the pole piece roll on the right side.

[0042] When the first CCD detector 171 detects that the alignment between the right pole piece and the upper diaphragm is poor, the signal is transmitted to the control module. After processing the signal, the control module controls the upper diaphragm correction component 181 to correct the upper diaphragm, and at the same time controls the right pole piece correction component 184 to correct the right pole piece.

[0043] Similarly, when the second CCD detector 172 detects that the alignment between the left pole piece and the lower diaphragm is poor, it transmits a signal to the control module. After processing the signal, the control module controls the lower diaphragm correction component 182 to correct the lower diaphragm, and at the same time controls the left pole piece correction component 183 to correct the left pole piece.

[0044] Similarly, when the third CCD detector 173 detects that the alignment between the right pole piece at the tail of the battery cell and the upper diaphragm is poor, it transmits a signal to the control module. After processing the signal, the control module controls the upper diaphragm correction component 181 to correct the upper diaphragm, and at the same time controls the right pole piece correction component 184 to correct the right pole piece.

[0045] like Figure 2 As shown, the winding station 13 is in the state of continuous threading of the diaphragm and the electrode piece, the gluing station 14 is in the state of finishing and unfinished gluing, the diaphragm and the electrode piece are not cut, and the unloading station 15 is currently in the state of waiting for unloading.

[0046] As a preferred embodiment, the glue laminating station 14 is provided with a glue laminating roller 141 and a finishing roller 142. The finishing roller 142 includes at least one. The finishing roller 142 of this embodiment includes two, which are distributed at a certain distance around the glue laminating station 14. The glue laminating roller 141 is also arranged around the glue laminating station 14. With the assistance of the two finishing rollers 142, the pole piece and the diaphragm at the tail are neatly finished, which provides preparation for the stability of the finishing glue.

[0047] The core shaft 12 on the turret 11 has three sets of pressure rollers 121, which cooperate with the three sets of winding needles to finish the battery cells, and also cooperate with the two pressure rollers 121 on the cutting mechanism to perform the pressing action. At the same time, it also cleverly plays a role in limiting the diaphragm and the electrode after changing the work station, and prepares for the winding needle on the winding station 13 to penetrate the diaphragm, saving time and improving production efficiency.

[0048] The detailed structure of the pole piece gluing mechanism 2 is described below.

[0049] like Figure 3 As shown, the electrode gluing mechanism 2 includes a surface rubber material roll 21, a sheet feeding assembly 22, a cutter assembly 23, a electrode main drive belt assembly 24 and a gluing assembly 25. The sheet feeding assembly 22, the cutter assembly 23, the electrode main drive belt assembly 24 and the gluing assembly 25 are arranged in sequence from top to bottom. The gluing assembly 25 and the surface rubber material roll 21 are both arranged on both sides of the electrode. The film of the surface rubber material roll 21 is transported to the gluing assembly 25. When the electrode is cut by the cutter assembly 23, its tail is glued through the gluing assembly 25.

[0050] Continue to see Figure 3As shown, the glue sticking assembly 25 includes a support frame 251, a horizontal movement driving motor 252, a rubber wheel 253 and a rubber wheel driving motor 254. The rubber wheel 253 is mounted on the support frame 251. The horizontal movement driving motor 252 and the rubber wheel driving motor 254 are simultaneously connected to the rubber wheel 253 for driving and rotating the rubber wheel 253. The rubber wheel 253 is provided with a glue pressing swing arm 255, which is connected to the glue pressing swing arm driving motor 256. The support frame 251 is also provided with a film cutter 257, and the film is cut by the film cutter 257.

[0051] The electrode gluing process using the above-mentioned electrode gluing mechanism 2 includes the following steps:

[0052] Step S1: The electrode is fed, the cutter cuts and cuts the electrode, and the tail of the previous electrode is rolled and glued;

[0053] Step S2: The clamp of the film feeding mechanism opens and moves backward, and the film feeding mechanism feeds the film downward to roll glue on the head of the next electrode.

[0054] The detailed gluing process is as follows: large-surface glue preparation-->sheet feeding assembly 22 feeds sheets-->cutter assembly 23 cuts and cuts the electrode-->gluing (rolling glue on the tail of the electrode of the battery cell)-->the clamp of the sheet feeding assembly 22 opens and retreats-->sheet feeding assembly 22 feeds the sheet downward-->the main driving material belt assembly 24 of the electrode brings the material downward-->gluing (rolling glue on the head of the electrode of the next battery cell)-->complete the cutting of the electrode of the two battery cells and connect the tail of the previous battery cell with the head of the next battery cell with tape. The tape on the electrode is prepared for the final cutting of the battery cell winding. At the same time, the blank spacing of the electrode of the two battery cells can be adjusted, which is set for different battery cell processes.

[0055] In the description of the present invention, it should be noted that, unless otherwise specified, "multiple" means two or more than two; the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0056] In the description of the present invention, it is also necessary to explain 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 an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0057] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A pole piece gluing process, characterized in that: The method comprises a pole piece gluing mechanism for gluing pole pieces, wherein the pole piece gluing mechanism is located on the side of the winding mechanism, and a plurality of guide rollers are arranged between the pole piece gluing mechanism and the winding mechanism, and comprises the following steps: Step S1: The electrode is fed, the cutter cuts and cuts the electrode, and the tail of the previous electrode is rolled and glued; Step S2: The clamp of the film feeding mechanism opens and moves backward, and the film feeding mechanism feeds the film downward to roll glue on the head of the next electrode.

2. A pole piece gluing mechanism, characterized in that: It includes a surface rubber material roll, a sheet feeding assembly, a cutter assembly, a pole piece main drive belt assembly and a glue sticking assembly. The sheet feeding assembly, the cutter assembly, the pole piece main drive belt assembly and the glue sticking assembly are arranged in sequence from top to bottom. The glue sticking assembly and the surface rubber material roll are both arranged on both sides of the pole piece. The film of the surface rubber material roll is transported to the glue sticking assembly. When the pole piece is cut off by the cutter assembly, its tail is glued by the glue sticking assembly.

3. The pole piece gluing mechanism according to claim 2, characterized in that: The glue sticking assembly includes a support frame, a horizontal movement drive motor, a spare rubber wheel and a spare rubber wheel drive motor. The spare rubber wheel is installed on the support frame. The horizontal movement drive motor and the spare rubber wheel drive motor are simultaneously connected to the spare rubber wheel drive to enable the spare rubber wheel to move horizontally and rotate.

4. The pole piece gluing mechanism according to claim 3, characterized in that: The rubber spare wheel is provided with a rubber pressing swing arm, and the rubber pressing swing arm is drivingly connected to the rubber pressing swing arm driving motor.

5. The pole piece gluing mechanism according to claim 3, characterized in that: The support frame is also provided with a film cutter.

6. A winding device, characterized in that: It comprises the electrode gluing mechanism as described in any one of claims 2-5, and also comprises a winding mechanism, wherein the electrode gluing mechanism is arranged on the conveying channel of the electrode, the winding mechanism comprises a core shaft and a turret rotating around the core shaft, the electrode gluing mechanism is located on the side of the turret, the turret is provided with a winding station, a gluing station and a unloading station, the winding station, the gluing station and the unloading station are switched sequentially, and when the winding station winds the battery cell, the electrode gluing mechanism conveys the glued electrode to the winding station.

7. The winding device according to claim 6, characterized in that The turret is provided with a first film-joining roller assembly and a second film-joining roller assembly near the winding station, and the clamping end of the first film-joining roller assembly and the clamping end of the second film-joining roller assembly move toward or away from each other.

8. The winding device according to claim 6, characterized in that: It also includes a CCD detector, a control module and a correction component. The control module is electrically connected to the CCD detector and the correction component at the same time. The CCD detector detects the alignment of the pole piece and the diaphragm. If the pole piece and the diaphragm are not aligned, the CCD detector transmits a signal to the control module, and the control module controls the correction component to correct the pole piece or the diaphragm.

9. The winding device according to claim 8, characterized in that: The CCD detector includes a first CCD detector for detecting the alignment of the right pole piece and the upper diaphragm, a second CCD detector for detecting the alignment of the rolled left pole piece and the lower diaphragm, and a third CCD detector for detecting the alignment of the right pole piece and the upper diaphragm at the end of each battery cell.

10. The winding device according to claim 6, characterized in that: The gluing station is provided with a gluing roller and a finishing roller, wherein the finishing roller comprises at least one and is arranged in the circumference of the gluing station, and the gluing roller is also arranged in the circumference of the gluing station.

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