Novel winding process and winding device

Abstract

The invention belongs to the technical field of new energy cylindrical battery cell winding, and particularly relates to a novel winding process and a novel winding device. A positive pole piece unwinding mechanism, a negative pole piece unwinding mechanism, an upper diaphragm unwinding mechanism, a lower diaphragm unwinding mechanism, a central film unwinding mechanism, a film pressing mechanism, a central film cutting mechanism, a diaphragm rubberizing mechanism, a winding needle, a pole piece cutting mechanism, a pole piece rubberizing mechanism and a traction mechanism are mounted on the rack; the central film unwinding mechanism is used for unwinding a central film; and the positive plate unwinding mechanism is used for unwinding the positive plate. According to the invention, the internal supporting force of the battery cell can be effectively increased, and poor and abnormal needle pulling and core pulling are reduced, so that the situation that heat and gas generated by battery charging and discharging are difficult due to the fact that a steel needle is inserted into a traditional central tube is effectively reduced, the infiltration effect of the battery cell is improved, the internal supporting effect of the battery cell is improved, the internal wrinkling problem is reduced, and the battery safety is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of new energy cylindrical battery cell winding, and specifically relates to a novel winding process and a winding device. Background Art

[0002] There is no center tube in the preparation process of new energy cylindrical battery cells, which will cause wrinkles inside the battery cells during high-rate cycling, affecting the safety of the battery cells. The traditional method of adding a center tube, most of which are made of steel, has a certain supporting effect on the inside of the center tube battery cell and suppresses the wrinkles inside the battery cell. However, during the battery charging and discharging process, the gas and heat inside the battery cell are difficult to discharge in time, which also affects the battery's wetting effect, affects the battery performance, and makes the battery unsafe. Summary of the invention

[0003] The purpose of the present invention is to provide a new type of winding process and winding device. By surrounding a circle of central membrane around the inner side of the central membrane, upper diaphragm, positive electrode sheet and lower diaphragm as a supporting structure, the supporting force inside the battery cell can be effectively increased, and the abnormalities of needle pulling and core extraction can be reduced, so as to effectively reduce the heat and gas discharge difficulties generated by battery charging and discharging caused by the traditional central tube steel needle insertion, increase the wetting effect of the battery cell, increase the internal supporting function of the battery cell, reduce internal wrinkle problems, increase battery safety, and have high application value in the new energy battery industry, especially in the direction of winding cylindrical batteries.

[0004] The technical solution adopted by the present invention is as follows:

[0005] A novel winding device comprises a frame, on which are mounted a positive electrode sheet unwinding mechanism, a negative electrode sheet unwinding mechanism, an upper diaphragm unwinding mechanism, a lower diaphragm unwinding mechanism, a center mold unwinding mechanism, a film pressing mechanism, a center film cutting mechanism, a film sheet gluing mechanism, a winding needle, a pole sheet cutting mechanism, a pole sheet gluing mechanism and a traction mechanism;

[0006] The center mold unwinding mechanism is used to unwind the center film;

[0007] The positive electrode sheet unwinding mechanism is used to unwind the positive electrode sheet;

[0008] The central mold unwinding mechanism is installed between the positive electrode sheet unwinding mechanism and the negative electrode sheet unwinding mechanism, and the negative electrode sheet unwinding mechanism is used to unwind the negative electrode sheet;

[0009] The upper diaphragm unwinding mechanism is installed between the positive electrode sheet unwinding mechanism and the central mold unwinding mechanism, and the upper diaphragm unwinding mechanism is used to unwind the upper diaphragm;

[0010] The lower diaphragm unwinding mechanism is installed at a position of the negative electrode sheet unwinding mechanism away from the central mold unwinding mechanism, and the lower diaphragm unwinding mechanism is used to unwind the lower diaphragm;

[0011] The winding needle is used to wind the center film, the upper diaphragm, the positive electrode sheet, the lower diaphragm and the negative electrode sheet;

[0012] The film pressing mechanism is installed between the upper diaphragm unwinding mechanism, the center mold unwinding mechanism and the winding needle, and is used to position the upper diaphragm or the center film;

[0013] The central film cutting mechanism is installed between the first film clamp and the second film clamp, and is used to cut the upper diaphragm or the central film;

[0014] The diaphragm gluing mechanism is used to perform gluing treatment on the upper diaphragm or the center diaphragm;

[0015] The electrode sheet cutting mechanism is fixedly connected to the frame at a position close to the winding needle, and is used to cut the center film, the upper diaphragm, the positive electrode sheet, the lower diaphragm and the negative electrode sheet;

[0016] The electrode gluing mechanism is fixedly connected to the frame at a position close to the winding needle, and is used to perform gluing treatment on the upper diaphragm, the positive electrode, the lower diaphragm and the negative electrode;

[0017] The traction mechanism is used to pull the central film, the upper diaphragm, the positive electrode sheet, the lower diaphragm and the negative electrode sheet to the winding needle, and to pull the central film and the upper diaphragm through the film pressing mechanism, the central film cutting mechanism and the film gluing mechanism.

[0018] Furthermore, the center film unwinding mechanism includes a center film unwinding shaft and a center film conveying roller installed on the frame, the center film is wound around the outside of the center film unwinding shaft, and the center film unwinded by the center film unwinding shaft bypasses the center film conveying roller.

[0019] Further, the positive electrode sheet unwinding mechanism comprises a positive electrode sheet unwinding shaft installed on the frame and located on one side of the winding needle, a positive electrode sheet tape splicing platform, a positive electrode sheet back defect detection mechanism, a positive electrode sheet front defect detection mechanism, a positive electrode sheet unwinding tension roller, a glue pasting device and a plurality of positive electrode sheet conveying rollers, the positive electrode sheet is wound on the positive electrode sheet unwinding shaft, the positive electrode sheet unwinded by the positive electrode sheet unwinding shaft sequentially bypasses the positive electrode sheet unwinding tension roller and the plurality of positive electrode sheet conveying rollers, and the positive electrode sheet unwinded by the positive electrode sheet unwinding shaft sequentially passes through the positive electrode sheet tape splicing platform, the positive electrode sheet back defect detection mechanism, the positive electrode sheet front defect detection mechanism and the glue pasting device;

[0020] The negative electrode sheet unwinding mechanism comprises a negative electrode sheet unwinding shaft installed on the frame and located on the other side of the winding needle, a negative electrode sheet tape connection platform, a negative electrode sheet back surface defect detection mechanism, a negative electrode sheet front surface defect detection mechanism, a negative electrode sheet unwinding tension roller and a plurality of negative electrode sheet conveying rollers, the negative electrode sheet is wound on the negative electrode sheet unwinding shaft, the negative electrode sheet unwinded by the negative electrode sheet unwinding shaft sequentially bypasses the negative electrode sheet unwinding tension roller and the plurality of negative electrode sheet conveying rollers, and the negative electrode sheet unwinded by the negative electrode sheet unwinding shaft sequentially passes through the negative electrode sheet tape connection platform, the negative electrode sheet back surface defect detection mechanism, and the negative electrode sheet front surface defect detection mechanism;

[0021] The upper diaphragm unwinding mechanism comprises an upper diaphragm unwinding shaft, an upper diaphragm tension roller and a plurality of upper diaphragm conveying rollers installed on a frame, the upper diaphragm is wound on the upper diaphragm unwinding shaft, and the upper diaphragm unwinded by the upper diaphragm unwinding shaft sequentially passes around the upper diaphragm tension roller and the plurality of upper diaphragm conveying rollers;

[0022] The lower diaphragm unwinding mechanism includes a lower diaphragm unwinding shaft, a lower diaphragm tension roller and a plurality of lower diaphragm conveying rollers installed on a frame, the lower diaphragm is wound on the lower diaphragm unwinding shaft, and the lower diaphragm unwound by the lower diaphragm unwinding shaft sequentially passes around the lower diaphragm tension roller and the plurality of lower diaphragm conveying rollers.

[0023] Furthermore, the film pressing mechanism includes a first cylinder, a first diaphragm clamp and a second diaphragm clamp, the first cylinder is fixedly connected to the frame and is located between the upper diaphragm unwinding mechanism, the center mold unwinding mechanism and the winding needle, the first cylinder is horizontally arranged, and the piston rod of the first cylinder is fixedly connected to a connecting piece, two of the first diaphragm clamps are fixedly connected to the connecting piece in parallel, and the second diaphragm clamp is fixedly connected to the frame and is located at a position of the first diaphragm clamp close to the winding needle.

[0024] Furthermore, the first diaphragm clamp and the second diaphragm clamp each include a base plate, the base plate of the first diaphragm clamp is fixedly connected to the connecting piece, the base plate of the second diaphragm clamp is fixedly connected to the frame, two horizontally parallel second cylinders are fixedly connected to the first diaphragm clamp, and the piston rods of the two second cylinders are fixedly connected to a clamp.

[0025] Furthermore, the central film cutting mechanism includes two third cylinders fixedly connected to the frame and arranged horizontally in parallel. The third cylinders are horizontally arranged and located between the first diaphragm clamp and the second diaphragm clamp. The piston rods of the two third cylinders are fixedly connected to cutting tools.

[0026] Furthermore, the diaphragm gluing mechanism includes two fourth cylinders fixedly connected to the frame and arranged horizontally in parallel, the fourth cylinders are vertically arranged, and the two fourth cylinders are respectively located on both sides of the second diaphragm clamp, the piston rods of the two fourth cylinders are fixedly connected to a mounting plate, the two mounting plates are fixedly connected to a horizontally arranged fifth cylinder, and the piston rod of the fifth cylinder is fixedly connected to a gluing unit.

[0027] Furthermore, the material of the central membrane is PP or PET.

[0028] A novel winding process comprises the following steps:

[0029] S1: unwind the center film through the center mold unwinding mechanism. When the center film is unwound to a set length, the film pressing mechanism is started to position the center film.

[0030] S2: Start the center film cutting mechanism to cut the center film;

[0031] S3: Start the film pressing mechanism to press the diaphragm and the center film, and then use the diaphragm gluing mechanism to stick high-temperature glue on both sides, so that the end of the center film and the initial end of the upper diaphragm are bonded together;

[0032] S4: Start the winding needle to wind the central film until the central film is wound into a circle;

[0033] S5: Start winding the upper diaphragm bonded to the center film until the upper diaphragm is wound 2-3 times;

[0034] S6: Start the traction mechanism to pull the negative electrode sheet to the winding needle, and start the winding needle to wind the negative electrode sheet 2-3 times;

[0035] S7: Start the traction mechanism to pull the lower diaphragm to the winding needle, and start the winding needle to wind the lower diaphragm 2-3 times;

[0036] S8: Start the traction mechanism to pull the positive electrode sheet to the winding needle, and start the winding needle to wind the positive electrode sheet;

[0037] S9: Continue to wind the upper separator, the positive electrode sheet, the lower separator, and the negative electrode sheet through the winding needle until the battery cell is wound into shape;

[0038] S10: After the battery core is wound, the winding needle retreats half a circle or a full circle to increase the internal support force and reduce the abnormality of needle pulling and core pulling;

[0039] S11: Start the electrode cutting mechanism to cut the center film, the upper diaphragm, the positive electrode, the lower diaphragm and the negative electrode;

[0040] S12: After the winding is completed, the pole piece gluing mechanism is started to perform a circle of gluing treatment on the outer side of the wound battery cell.

[0041] The technical effects achieved by the present invention are:

[0042] A novel winding process and winding device of the present invention uses a circle of central membrane as a supporting structure around the inner sides of the central membrane, the upper diaphragm, the positive electrode sheet and the lower diaphragm, which can effectively increase the supporting force inside the battery cell and reduce the abnormalities of needle extraction and core pulling, so as to effectively reduce the heat and gas discharge difficulties caused by the traditional central tube steel needle insertion during battery charging and discharging, increase the wetting effect of the battery cell, increase the internal supporting effect of the battery cell, reduce the internal wrinkle problem, and increase battery safety. It has high application value in the new energy battery industry, especially in the direction of winding cylindrical batteries. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a schematic diagram of the structure of the present invention;

[0044] Figure 2 It is a structural schematic diagram of the positive electrode sheet unwinding mechanism of the present invention;

[0045] Figure 3 It is a structural schematic diagram of the negative electrode sheet unwinding mechanism of the present invention;

[0046] Figure 4 It is a partial enlarged view of the present invention;

[0047] Figure 5 The present invention Figure 4 A partial enlarged view of point A in the middle.

[0048] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0049] 100, positive electrode sheet unwinding mechanism; 101, positive electrode sheet unwinding shaft; 102, positive electrode sheet conveying roller; 103, positive electrode sheet tape connection platform; 104, positive electrode sheet back defect detection mechanism; 105, positive electrode sheet front defect detection mechanism; 106, positive electrode sheet unwinding tension roller; 107, glue laminating equipment; 200, negative electrode sheet unwinding mechanism; 201, negative electrode sheet unwinding shaft; 202, negative electrode sheet conveying roller; 203, negative electrode sheet tape connection platform; 204, negative electrode sheet back defect detection mechanism; 205, negative electrode sheet front defect detection mechanism; 206, negative electrode sheet unwinding tension roller; 300, upper diaphragm unwinding mechanism; 301, upper diaphragm unwinding shaft; 302, upper diaphragm tension roller; 303, upper diaphragm conveying roller; 400, lower diaphragm unwinding mechanism; 401, lower diaphragm Unwinding shaft; 402, lower diaphragm tension roller; 403, lower diaphragm conveying roller; 500, center mold unwinding mechanism; 501, center film unwinding shaft; 502, center film conveying roller; 600, film pressing mechanism; 601, first cylinder; 602, first diaphragm clamp; 603, connecting piece; 604, bottom plate; 605, second cylinder; 606, clamping plate; 607, second diaphragm clamp; 700, center film cutting mechanism; 701, third cylinder; 702, cutting tool; 800, diaphragm gluing mechanism; 801, fourth cylinder; 802, mounting plate; 803, fifth cylinder; 804, gluing unit; 900, conveyor; 1000, unloading clamp; 1100, winding needle; 1200, pole piece cutting mechanism; 1300, pole piece gluing mechanism. DETAILED DESCRIPTION

[0050] In order to make the purpose and advantages of the present invention more clearly understood, the present invention is specifically described below in conjunction with embodiments. It should be understood that the following text is only used to describe one or several specific embodiments of the present invention, and does not strictly limit the scope of protection of the specific claims of the present invention.

[0051] Embodiment 1:

[0052] like Figure 1-5 As shown, a novel winding device includes a frame, on which are mounted a positive electrode sheet unwinding mechanism 100, a negative electrode sheet unwinding mechanism 200, an upper diaphragm unwinding mechanism 300, a lower diaphragm unwinding mechanism 400, a center mold unwinding mechanism 500, a film pressing mechanism 600, a center film cutting mechanism 700, a film sheet gluing mechanism 800, a winding needle 1100, a pole sheet cutting mechanism 1200, a pole sheet gluing mechanism 1300 and a traction mechanism;

[0053] The center mold unwinding mechanism 500 is used to unwind the center film;

[0054] like Figure 1 and Figure 4As shown, the center film unwinding mechanism 500 includes a center film unwinding shaft 501 and a center film conveying roller 502 installed on a frame. The center film is wound around the outside of the center film unwinding shaft 501, and the center film unwinded by the center film unwinding shaft 501 bypasses the center film conveying roller 502, and the center film can be guided by the center film conveying roller 502.

[0055] The material of the center membrane is a material that is not easily susceptible to electrolyte, preferably PP or PET.

[0056] Among them, the positive electrode sheet unwinding mechanism 100 is used to unwind the positive electrode sheet;

[0057] like Figure 1-2 As shown, the positive electrode sheet unwinding mechanism 100 includes a positive electrode sheet unwinding shaft 101 installed on a frame and located on one side of a winding needle 1100, a positive electrode sheet tape connection platform 103, a positive electrode sheet back defect detection mechanism 104, a positive electrode sheet front defect detection mechanism 105, a positive electrode sheet unwinding tension roller 106, a glue laminating device 107 and a plurality of positive electrode sheet conveying rollers 102. The positive electrode sheet is wound on the positive electrode sheet unwinding shaft 101, and the positive electrode sheet unwound by the positive electrode sheet unwinding shaft 101 sequentially passes around the positive electrode sheet unwinding tension rollers 106 and multiple positive electrode sheet conveying rollers 102, and the positive electrode sheet unwound by the positive electrode sheet unwinding shaft 101 passes through the positive electrode sheet splicing platform 103, the positive electrode sheet back side defect detection mechanism 104, the positive electrode sheet front side defect detection mechanism 105 and the gluing equipment 107 in sequence. At this time, the positive electrode sheet back side defect detection mechanism 104 and the positive electrode sheet front side defect detection mechanism 105 can respectively perform defect detection on the front and back sides of the positive electrode sheet, and the positive electrode sheet can be glued by the gluing equipment 107.

[0058] The central mold unwinding mechanism 500 is installed between the positive electrode sheet unwinding mechanism 100 and the negative electrode sheet unwinding mechanism 200, and the negative electrode sheet unwinding mechanism 200 is used to unwind the negative electrode sheet;

[0059] like Figure 1 and Figure 3 As shown, the negative electrode sheet unwinding mechanism 200 includes a negative electrode sheet unwinding shaft 201 installed on the frame and located on the other side of the winding needle 1100, a negative electrode sheet splicing platform 203, a negative electrode sheet back defect detection mechanism 204, a negative electrode sheet front defect detection mechanism 205, a negative electrode sheet unwinding tension roller 206 and a plurality of negative electrode sheet conveying rollers 202. The negative electrode sheet is wound on the negative electrode sheet unwinding shaft 201. The negative electrode sheet unwound by the negative electrode sheet unwinding shaft 201 sequentially bypasses the negative electrode sheet unwinding tension roller 206 and the plurality of negative electrode sheet conveying rollers 202. The negative electrode sheet unwound by the negative electrode sheet unwinding shaft 201 passes through the negative electrode sheet splicing platform 203, the negative electrode sheet back defect detection mechanism 204, and the negative electrode sheet front defect detection mechanism 205 in sequence. At this time, the negative electrode sheet back defect detection mechanism 204 and the negative electrode sheet front defect detection mechanism 205 can respectively perform defect detection on the front and back sides of the negative electrode sheet.

[0060] The upper diaphragm unwinding mechanism 300 is installed between the positive electrode sheet unwinding mechanism 100 and the center mold unwinding mechanism 500, and the upper diaphragm unwinding mechanism 300 is used to unwind the upper diaphragm;

[0061] like Figure 1 and Figure 4 As shown, the upper diaphragm unwinding mechanism 300 includes an upper diaphragm unwinding shaft 301, an upper diaphragm tension roller 302 and a plurality of upper diaphragm conveying rollers 303 installed on a frame, the upper diaphragm is wound on the upper diaphragm unwinding shaft 301, and the upper diaphragm unwound by the upper diaphragm unwinding shaft 301 sequentially passes around the upper diaphragm tension roller 302 and the plurality of upper diaphragm conveying rollers 303, the upper diaphragm can be guided by the upper diaphragm conveying roller 303, and the upper diaphragm can be tensioned by the upper diaphragm tension roller 302.

[0062] The lower diaphragm unwinding mechanism 400 is installed at a position of the negative electrode sheet unwinding mechanism 200 away from the center mold unwinding mechanism 500, and the lower diaphragm unwinding mechanism 400 is used to unwind the lower diaphragm;

[0063] like Figure 1 and Figure 4 As shown, the lower diaphragm unwinding mechanism 400 includes a lower diaphragm unwinding shaft 401, a lower diaphragm tension roller 402 and a plurality of lower diaphragm conveying rollers 403 installed on a frame, the lower diaphragm is wound on the lower diaphragm unwinding shaft 401, and the lower diaphragm unwound by the lower diaphragm unwinding shaft 401 sequentially passes around the lower diaphragm tension roller 402 and the plurality of lower diaphragm conveying rollers 403, the lower diaphragm can be guided by the lower diaphragm conveying roller 403, and the lower diaphragm can be tensioned by the lower diaphragm tension roller 402.

[0064] Among them, the winding needle 1100 is used to wind the central film, the upper diaphragm, the positive electrode sheet, the lower diaphragm and the negative electrode sheet.

[0065] The film pressing mechanism 600 is installed between the upper diaphragm unwinding mechanism 300, the center mold unwinding mechanism 500 and the winding needle 1100, and is used to position the upper diaphragm or the center film;

[0066] like Figure 1 and Figure 4-5As shown, the film pressing mechanism 600 includes a first cylinder 601, a first diaphragm clamp 602 and a second diaphragm clamp 607. The first cylinder 601 is fixedly connected to the frame and is located between the upper diaphragm unwinding mechanism 300, the center mold unwinding mechanism 500 and the winding needle 1100. The first cylinder 601 is horizontally arranged, and the piston rod of the first cylinder 601 is fixedly connected to a connecting member 603. Two first diaphragm clamps 602 are fixedly connected to the connecting member 603 in parallel. The second diaphragm clamp 607 is fixedly connected to the frame and is located at the position of the first diaphragm clamp 602 close to the winding needle 1100. At this time, the center film and the upper diaphragm can be clamped and positioned respectively by the two connecting members 603. By starting the first cylinder 601, the first diaphragm clamp 602 can be driven to move horizontally to adjust the horizontal positions of the center film and the upper diaphragm.

[0067] like Figure 4-5 As shown, the first diaphragm clamp 602 and the second diaphragm clamp 607 both include a base plate 604, the base plate 604 of the first diaphragm clamp 602 is fixedly connected to the connecting piece 603, the base plate 604 of the second diaphragm clamp 607 is fixedly connected to the frame, and the first diaphragm clamp 602 is fixedly connected to two horizontally parallel second cylinders 605, and the piston rods of the two second cylinders 605 are fixedly connected to clamps 606. At this time, the distance between the two clamps 606 can be adjusted by starting the second cylinder 605, so that the two clamps 606 can clamp the upper diaphragm or the center membrane.

[0068] The center film cutting mechanism 700 is installed between the first film clamp 602 and the second film clamp 607, and is used to cut the upper diaphragm or the center film;

[0069] like Figure 1 and Figure 4-5 As shown, the central film cutting mechanism 700 includes two third cylinders 701 fixedly connected to the frame and arranged horizontally in parallel. The third cylinders 701 are horizontally arranged and located between the first diaphragm clamp 602 and the second diaphragm clamp 607. The piston rods of the two third cylinders 701 are fixedly connected with cutting tools 702. By starting the third cylinders 701, the cutting tools 702 can be driven to move, so that the moving cutting tools 702 can cut the upper diaphragm or the central film.

[0070] The diaphragm gluing mechanism 800 is used to perform gluing on the upper diaphragm or the center diaphragm;

[0071] like Figure 1 and Figure 4-5As shown, the diaphragm gluing mechanism 800 includes two fourth cylinders 801 fixedly connected to the frame and arranged horizontally in parallel, the fourth cylinders 801 are vertically arranged, and the two fourth cylinders 801 are respectively located on both sides of the second diaphragm clamp 607, the piston rods of the two fourth cylinders 801 are fixedly connected to the mounting plate 802, the two mounting plates 802 are fixedly connected to the horizontally arranged fifth cylinder 803, and the piston rod of the fifth cylinder 803 is fixedly connected to the gluing unit 804. At this time, starting the fourth cylinder 801 can drive the gluing unit 804 to move vertically, and starting the fifth cylinder 803 can drive the gluing unit 804 to move horizontally, thereby adjusting the position of the gluing unit 804, allowing the gluing unit 804 to contact the upper diaphragm or the center membrane, and performing a gluing treatment on it.

[0072] The electrode sheet cutting mechanism 1200 is fixedly connected to the frame near the winding needle 1100 and is used to cut the center film, the upper diaphragm, the positive electrode sheet, the lower diaphragm and the negative electrode sheet;

[0073] Among them, the electrode gluing mechanism 1300 is fixedly connected to the frame near the winding needle 1100, and is used to perform gluing treatment on the upper diaphragm, the positive electrode sheet, the lower diaphragm and the negative electrode sheet;

[0074] The traction mechanism is used to pull the center film, the upper diaphragm, the positive electrode sheet, the lower diaphragm and the negative electrode sheet to the winding needle 1100, and to pull the center film and the upper diaphragm through the film pressing mechanism 600, the center film cutting mechanism 700 and the film gluing mechanism 800;

[0075] Among them, the winding device also includes a conveyor 900 and a blanking clamp 1000. The conveyor 900 is provided with multiple core unloading stations. When the battery cell is wound, the battery cell can be moved to the core unloading station of the conveyor 900 through the blanking clamp 1000 for unloading.

[0076] Embodiment 2:

[0077] like Figure 1-5 As shown, this embodiment discloses a new winding process based on embodiment 1, comprising the following steps:

[0078] S1: unwinding the center film through the center mold unwinding mechanism 500, when the center film is unwound to a set length, starting the film pressing mechanism 600 to position the center film;

[0079] Here, the set length of the center film is ≧ the length of the center film wound around the outer side of the winding needle 1100 for one circle;

[0080] S2: starting the center film cutting mechanism 700 to cut the center film;

[0081] S3: Start the film pressing mechanism 600 to press the diaphragm and the center film, and then use the film gluing mechanism 800 to stick high-temperature glue on both sides, so that the end of the center film and the initial end of the upper diaphragm are bonded together;

[0082] S4: Start the winding needle 1100 to wind the center film until the center film is wound into a circle;

[0083] S5: Start the winding needle 1100 to wind the upper diaphragm bonded to the center film until the upper diaphragm is wound 2-3 times;

[0084] S6: Start the traction mechanism to pull the negative electrode sheet to the winding needle 1100, and start the winding needle 1100 to wind the negative electrode sheet 2-3 times;

[0085] S7: Start the traction mechanism to pull the lower diaphragm to the winding needle 1100, and start the winding needle 1100 to wind the lower diaphragm 2-3 times;

[0086] S8: Start the traction mechanism to pull the positive electrode sheet to the winding needle 1100, and start the winding needle 1100 to wind the positive electrode sheet 2-3 times;

[0087] S9: Continue to wind the upper separator, the positive electrode sheet, the lower separator, and the negative electrode sheet by the winding needle 1100 until the battery cell is wound into shape;

[0088] S10: After the battery cell is wound, the winding needle 1100 retreats half a circle or a full circle, which can increase the internal support force and reduce the abnormality of needle pulling and core pulling;

[0089] S11: starting the electrode sheet cutting mechanism 1200 to cut the center film, the upper separator, the positive electrode sheet, the lower separator and the negative electrode sheet;

[0090] S12: After the winding is completed, the pole piece gluing mechanism 1300 is started to perform a circle of gluing treatment on the outer side of the wound battery cell;

[0091] S13: After winding is completed, the battery cell is placed on the conveyor 900 through the unloading clamp 1000 for unloading.

[0092] Here, the initial end of the central film, the upper separator, the positive electrode sheet, the lower separator and the negative electrode sheet is the end where the central film and the upper separator first contact with the winding needle 1100 .

[0093] In the technical solution of this embodiment, a circle of central membrane is wrapped around the inner side of the central membrane, the upper diaphragm, the positive electrode sheet, and the lower diaphragm as a supporting structure, which can effectively increase the supporting force inside the battery cell and reduce abnormalities in needle extraction and core extraction, so as to effectively reduce the heat and gas discharge difficulties caused by the traditional central tube insertion steel needle, increase the wetting effect of the battery cell, increase the internal support of the battery cell, reduce internal wrinkle problems, and increase battery safety. It has high application value in the new energy battery industry, especially in the direction of wound cylindrical batteries.

[0094] The above is only a preferred embodiment of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principles of the present invention, and these improvements and modifications should also be considered as the protection scope of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention shall be implemented according to the conventional means in the art unless otherwise specified and limited.

Claims

1. A new winding device, characterized in that: The invention comprises a frame, on which a positive electrode sheet unwinding mechanism (100), a negative electrode sheet unwinding mechanism (200), an upper diaphragm unwinding mechanism (300), a lower diaphragm unwinding mechanism (400), a central mold unwinding mechanism (500), a film pressing mechanism (600), a central film cutting mechanism (700), a film sheet gluing mechanism (800), a winding needle (1100), a pole sheet cutting mechanism (1200), a pole sheet gluing mechanism (1300) and a traction mechanism are installed; The central mold unwinding mechanism (500) is used to unwind the central film; The positive electrode sheet unwinding mechanism (100) is used to unwind the positive electrode sheet; The central mold unwinding mechanism (500) is installed between the positive electrode sheet unwinding mechanism (100) and the negative electrode sheet unwinding mechanism (200), and the negative electrode sheet unwinding mechanism (200) is used to unwind the negative electrode sheet; The upper diaphragm unwinding mechanism (300) is installed between the positive electrode sheet unwinding mechanism (100) and the central mold unwinding mechanism (500), and the upper diaphragm unwinding mechanism (300) is used to unwind the upper diaphragm; The lower diaphragm unwinding mechanism (400) is installed at a position of the negative electrode sheet unwinding mechanism (200) away from the central mold unwinding mechanism (500), and the lower diaphragm unwinding mechanism (400) is used to unwind the lower diaphragm; The winding needle (1100) is used to wind the central film, the upper diaphragm, the positive electrode sheet, the lower diaphragm and the negative electrode sheet; The film pressing mechanism (600) is installed between the upper diaphragm unwinding mechanism (300), the center mold unwinding mechanism (500) and the winding needle (1100) and is used to position the upper diaphragm or the center film; The central film cutting mechanism (700) is installed between the first film clamp (602) and the second film clamp (607) and is used to cut the upper diaphragm or the central film; The diaphragm gluing mechanism (800) is used to perform gluing processing on the upper diaphragm or the center membrane; The electrode sheet cutting mechanism (1200) is fixedly connected to a position on the frame close to the winding needle (1100) and is used to cut the center film, the upper diaphragm, the positive electrode sheet, the lower diaphragm and the negative electrode sheet; The electrode gluing mechanism (1300) is fixedly connected to a position on the frame close to the winding needle (1100) and is used to perform gluing processing on the upper diaphragm, the positive electrode sheet, the lower diaphragm and the negative electrode sheet; The traction mechanism is used to pull the central film, the upper diaphragm, the positive electrode sheet, the lower diaphragm and the negative electrode sheet to the winding needle (1100), and to pull the central film and the upper diaphragm through the film pressing mechanism (600), the central film cutting mechanism (700) and the film gluing mechanism (800).

2. A novel winding device according to claim 1, characterized in that: The center film unwinding mechanism (500) comprises a center film unwinding shaft (501) and a center film conveying roller (502) installed on a frame, the center film is wound around the outside of the center film unwinding shaft (501), and the center film unwinded by the center film unwinding shaft (501) bypasses the center film conveying roller (502).

3. A novel winding device according to claim 1, characterized in that: The positive electrode sheet unwinding mechanism (100) comprises a positive electrode sheet unwinding shaft (101) installed on a frame and located on one side of a winding needle (1100), a positive electrode sheet tape splicing platform (103), a positive electrode sheet back surface defect detection mechanism (104), a positive electrode sheet front surface defect detection mechanism (105), a positive electrode sheet unwinding tension roller (106), a glue pasting device (107) and a plurality of positive electrode sheet conveying rollers (102); the positive electrode sheet is wound on the positive electrode sheet unwinding shaft (101); the positive electrode sheet unwinded by the positive electrode sheet unwinding shaft (101) sequentially bypasses the positive electrode sheet unwinding tension roller (106) and the plurality of positive electrode sheet conveying rollers (102); and the positive electrode sheet unwinded by the positive electrode sheet unwinding shaft (101) sequentially passes through the positive electrode sheet tape splicing platform (103), the positive electrode sheet back surface defect detection mechanism (104), the positive electrode sheet front surface defect detection mechanism (105) and the glue pasting device (107); The negative electrode sheet unwinding mechanism (200) comprises a negative electrode sheet unwinding shaft (201) installed on a frame and located on the other side of the winding needle (1100), a negative electrode sheet tape connection platform (203), a negative electrode sheet back surface defect detection mechanism (204), a negative electrode sheet front surface defect detection mechanism (205), a negative electrode sheet unwinding tension roller (206) and a plurality of negative electrode sheet conveying rollers (202); the negative electrode sheet is wound on the negative electrode sheet unwinding shaft (201); the negative electrode sheet unwinded by the negative electrode sheet unwinding shaft (201) sequentially bypasses the negative electrode sheet unwinding tension roller (206) and the plurality of negative electrode sheet conveying rollers (202); and the negative electrode sheet unwinded by the negative electrode sheet unwinding shaft (201) sequentially passes through the negative electrode sheet tape connection platform (203), the negative electrode sheet back surface defect detection mechanism (204) and the negative electrode sheet front surface defect detection mechanism (205); The upper diaphragm unwinding mechanism (300) comprises an upper diaphragm unwinding shaft (301), an upper diaphragm tension roller (302) and a plurality of upper diaphragm conveying rollers (303) installed on a frame, the upper diaphragm is wound on the upper diaphragm unwinding shaft (301), and the upper diaphragm unwinded by the upper diaphragm unwinding shaft (301) sequentially passes around the upper diaphragm tension roller (302) and the plurality of upper diaphragm conveying rollers (303); The lower diaphragm unwinding mechanism (400) comprises a lower diaphragm unwinding shaft (401), a lower diaphragm tension roller (402) and a plurality of lower diaphragm conveying rollers (403) installed on a frame; the lower diaphragm is wound on the lower diaphragm unwinding shaft (401); the lower diaphragm unwound by the lower diaphragm unwinding shaft (401) sequentially passes around the lower diaphragm tension roller (402) and the plurality of lower diaphragm conveying rollers (403).

4. A novel winding device according to claim 1, characterized in that: The film pressing mechanism (600) includes a first cylinder (601), a first diaphragm clamp (602) and a second diaphragm clamp (607). The first cylinder (601) is fixedly connected to the frame and is located between the upper diaphragm unwinding mechanism (300), the center mold unwinding mechanism (500) and the winding needle (1100). The first cylinder (601) is horizontally arranged, and the piston rod of the first cylinder (601) is fixedly connected to a connecting piece (603). Two of the first diaphragm clamps (602) are fixedly connected to the connecting piece (603) in parallel. The second diaphragm clamp (607) is fixedly connected to the frame and is located at a position of the first diaphragm clamp (602) close to the winding needle (1100).

5. A novel winding device according to claim 4, characterized in that: The first diaphragm clamp (602) and the second diaphragm clamp (607) both include a base plate (604), the base plate (604) of the first diaphragm clamp (602) is fixedly connected to the connecting piece (603), the base plate (604) of the second diaphragm clamp (607) is fixedly connected to the frame, two horizontally parallel second cylinders (605) are fixedly connected to the first diaphragm clamp (602), and the piston rods of the two second cylinders (605) are fixedly connected to a clamp (606).

6. A novel winding device according to claim 4, characterized in that: The central film cutting mechanism (700) comprises two third cylinders (701) fixedly connected to the frame and arranged horizontally in parallel. The third cylinders (701) are arranged horizontally and are located between the first film clamp (602) and the second film clamp (607). The piston rods of the two third cylinders (701) are fixedly connected to the cutting tools (702).

7. A novel winding device according to claim 1, characterized in that: The diaphragm gluing mechanism (800) comprises two fourth cylinders (801) fixedly connected to a frame and arranged horizontally in parallel, the fourth cylinders (801) are arranged vertically, and the two fourth cylinders (801) are respectively located on both sides of the second diaphragm clamp (607), the piston rods of the two fourth cylinders (801) are fixedly connected to a mounting plate (802), the two mounting plates (802) are fixedly connected to a horizontally arranged fifth cylinder (803), and the piston rod of the fifth cylinder (803) is fixedly connected to a gluing unit (804).

8. A novel winding device according to claim 1, characterized in that: The material of the central film is PP or PET.

9. A novel winding process, using a novel winding device according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1: unwinding the center film through the center mold unwinding mechanism (500), and when the center film is unwound to a set length, starting the film pressing mechanism (600) to position the center film; S2: starting the center film cutting mechanism (700) to cut the center film; S3: Start the film pressing mechanism (600) to press the diaphragm and the center film, and then use the film gluing mechanism (800) to stick high-temperature glue on both sides, so that the end of the center film and the initial end of the upper diaphragm are bonded together; S4: starting the winding needle (1100) to wind the central film until the central film is wound into a circle; S5: Start the winding needle (1100) to wind the upper diaphragm bonded to the center film until the upper diaphragm is wound 2-3 times; S6: starting the traction mechanism to pull the negative electrode sheet to the winding needle (1100), and starting the winding needle (1100) to wind the negative electrode sheet 2-3 times; S7: Start the traction mechanism to pull the lower diaphragm to the winding needle (1100), and start the winding needle (1100) to wind the lower diaphragm 2-3 times; S8: starting the traction mechanism to pull the positive electrode sheet to the winding needle (1100), and starting the winding needle (1100) to wind the positive electrode sheet; S9: Continuously winding the upper separator, the positive electrode sheet, the lower separator, and the negative electrode sheet by means of a winding needle (1100) until the battery cell is wound into shape; S10: After the battery cell is wound, the winding needle (1100) retreats half a circle or one circle; S11: starting the electrode sheet cutting mechanism (1200) to cut the center film, the upper separator, the positive electrode sheet, the lower separator and the negative electrode sheet; S12: After the winding is completed, the pole piece gluing mechanism (1300) is started to perform a circle of gluing treatment on the outer side of the wound battery cell.

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