Thermal composite lamination device and lithium battery production line

Abstract

The invention discloses a thermal composite lamination device and a lithium battery production line, and relates to the technical field of lithium battery production. The thermal compounding and laminating device comprises a rack, and a first unwinding mechanism, an active caching mechanism, a fixed cutting mechanism, a vacuum sheet conveying and dust removing mechanism, a deviation rectifying and sheet conveying mechanism and a first thermal compounding mechanism which are mounted on the rack. The active caching mechanism, the fixed cutting mechanism, the vacuum sheet conveying and dust removing mechanism, the deviation rectifying and sheet conveying mechanism and the first thermal compounding mechanism are sequentially arranged in the feeding direction of a positive plate material belt, the fixed cutting mechanism is used for cutting off the positive plate material belt with the preset length to form a positive plate, and the deviation rectifying and sheet conveying mechanism is used for rectifying deviation of the positive plate; and the positive plate subjected to deviation rectification is conveyed to the first thermal compounding mechanism. The thermal composite lamination device provided by the invention can reduce vibration generated when the pole piece is cut, improve the cutting effect, reduce the fluctuation of the short-circuit rate of the battery cell, facilitate batch production of the battery cell, avoid the position deviation of the pole piece, and ensure the quality of the battery cell.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery production, and in particular to a thermal composite lamination device and a lithium battery production line. Background Art

[0002] At present, in the production process of lithium batteries, the cutting of pole pieces is usually achieved by flying cutting with a cutter. However, the vibration generated during the flying cutting process is relatively large, which will cause the dust and burrs on the cutting edges of the pole pieces to be unstable, and the cutting effect will be sometimes good and sometimes bad, resulting in a large fluctuation in the short-circuit rate in the production of battery cell stacking, which is not conducive to the mass production of battery cells. In addition, the flying cutting vibration and subsequent dust removal may cause the pole piece position to shift, directly affecting the quality of the battery cell.

[0003] In view of this, it is particularly important to design and manufacture a hot composite lamination device and a lithium battery production line with good cutting effect and good product quality, especially in lithium battery production. Summary of the invention

[0004] The purpose of the present invention is to provide a thermal composite lamination device, which can reduce the vibration generated during the cutting of the pole piece, improve the cutting effect, reduce the fluctuation of the short-circuit rate of the battery cell, facilitate the mass production of the battery cell, and avoid the displacement of the pole piece position to ensure the quality of the battery cell.

[0005] Another object of the present invention is to provide a lithium battery production line that can reduce the vibration generated during electrode cutting, improve the cutting effect, reduce the fluctuation of the short-circuit rate of the battery cell, facilitate the mass production of the battery cell, and avoid the displacement of the electrode position to ensure the quality of the battery cell.

[0006] The present invention is achieved by adopting the following technical solutions.

[0007] A thermal composite lamination device comprises a frame and a first unwinding mechanism, an active buffering mechanism, a fixed cutting mechanism, a vacuum sheet feeding and dust removal mechanism, a deviation correction sheet feeding mechanism and a first thermal composite mechanism installed on the frame. The first unwinding mechanism is used to unwind a positive electrode sheet strip. The active buffering mechanism, the fixed cutting mechanism, the vacuum sheet feeding and dust removal mechanism, the deviation correction sheet feeding mechanism and the first thermal composite mechanism are arranged in sequence along the feeding direction of the positive electrode sheet strip. The active buffering mechanism is used to buffer a positive electrode sheet strip of a preset length. The fixed cutting mechanism is used to cut the positive electrode sheet strip of a preset length to form a positive electrode sheet. The vacuum sheet feeding and dust removal mechanism is used to vacuum absorb and transport the positive electrode sheet and remove dust. The deviation correction sheet feeding mechanism is used to correct the positive electrode sheet after dust removal and send the corrected positive electrode sheet to the first thermal composite mechanism. The first thermal composite mechanism is used to hot-press and composite the positive electrode sheet and the negative electrode composite strip to form a laminated composite strip.

[0008] Optionally, the deflection correction and film feeding mechanism includes a deflection correction driving member, a film feeding platform, a first deflection correction component, a deflection correction frame, a second deflection correction component and a supporting plate, the deflection correction driving member is installed on the frame and connected to the film feeding platform, the deflection correction driving member is used to drive the film feeding platform to move along a first direction, the first deflection correction component is installed on the film feeding platform and connected to the deflection correction frame, the first deflection correction component is used to drive the deflection correction frame to move along a second direction, the second deflection correction component is installed on the deflection correction frame and connected to the supporting plate, the second deflection correction component is used to drive the supporting plate to rotate on a preset plane, the first direction is perpendicular to the second direction, and the plane where the first direction and the second direction are located is parallel to the preset plane.

[0009] Optionally, the first correction component includes a first driving member, a first cam and a first rolling bearing, the correction frame is provided with a first waist-shaped hole, the first driving member is installed on the film feeding platform and is connected to the first cam, the first rolling bearing is sleeved outside the first cam and is arranged in the first waist-shaped hole; the film feeding platform is provided with a guide rail extending along the second direction, and the correction frame is provided with a slide, and the slide is slidably matched with the guide rail.

[0010] Optionally, the second correcting assembly includes a second driving member, a second cam and a second rolling bearing, the supporting plate is provided with a second waist-shaped hole, the second driving member is installed on the correcting frame and is connected to the second cam, the second rolling bearing is sleeved outside the second cam and arranged in the second waist-shaped hole; the correcting frame is provided with a rotating column extending along a third direction, the third direction is perpendicular to the preset plane, the supporting plate is provided with a limiting hole, and the rotating column rotates in cooperation with the limiting hole.

[0011] Optionally, the deviation-correcting and film-feeding mechanism further includes a vacuum suction cup, which is connected to the carrier plate and is used for vacuum adsorption of the positive electrode sheet.

[0012] Optionally, the active caching mechanism includes a first fixed roller, a second fixed roller, a cache driving member and a cache roller, the cache roller is arranged between the first fixed roller and the second fixed roller, the first fixed roller, the cache roller and the second fixed roller are used to cooperate with the positive electrode sheet strip in sequence, the cache driving member is connected to the cache roller, and the cache driving member is used to drive the cache roller to approach or move away from the first fixed roller and the second fixed roller.

[0013] Optionally, the fixed-cut mechanism includes a material pulling drive, a material pulling roller, a fixed-cut drive and a first cutter. The material pulling drive is connected to the material pulling roller, the material pulling roller is used to cooperate with the positive electrode sheet material strip, the material pulling drive is used to pull out the positive electrode sheet material strip of a preset length through the material pulling roller, the fixed-cut drive is connected to the first cutter, and the fixed-cut drive is used to drive the first cutter to cut the positive electrode sheet material strip.

[0014] Optionally, the hot composite lamination device also includes a diaphragm roller cutting mechanism, a line scanning detection mechanism and a lamination mechanism. The diaphragm roller cutting mechanism, the line scanning detection mechanism and the lamination mechanism are all installed on the frame and are arranged in sequence along the feeding direction of the laminated composite material strip. The diaphragm roller cutting mechanism is used to cut off the blank area of ​​the laminated composite material strip, the line scanning detection mechanism is used to detect whether the laminated composite material strip has quality defects, and the lamination mechanism is used to stack the laminated composite material strip.

[0015] Optionally, the diaphragm roller cutting mechanism includes an auxiliary roller, a pressure roller, a heating element, a roller cutting drive and a second cutter. The auxiliary roller and the pressure roller are arranged in parallel. The auxiliary roller and the pressure roller are used for allowing the laminated composite material strip to pass through. The roller cutting drive is connected to the pressure roller. The second cutter is installed on the circumferential surface of the pressure roller and is connected to the heating element. The heating element is used to heat the second cutter. The roller cutting drive is used to drive the pressure roller to rotate relative to the auxiliary roller so as to cut off the blank area of ​​the laminated composite material strip through the second cutter.

[0016] A lithium battery production line comprises the above-mentioned hot composite lamination device, which comprises a frame and a first unwinding mechanism, an active buffering mechanism, a fixed cutting mechanism, a vacuum sheet feeding and dust removal mechanism, a deviation correction sheet feeding mechanism and a first hot composite mechanism installed on the frame, the first unwinding mechanism is used to unwind the positive electrode sheet material strip, the active buffering mechanism, the fixed cutting mechanism, the vacuum sheet feeding and dust removal mechanism, the deviation correction sheet feeding mechanism and the first hot composite mechanism are arranged in sequence along the feeding direction of the positive electrode sheet material strip, the active buffering mechanism is used to buffer the positive electrode sheet material strip of a preset length, the fixed cutting mechanism is used to cut the positive electrode sheet material strip of a preset length to form a positive electrode sheet, the vacuum sheet feeding and dust removal mechanism is used to vacuum absorb and transport the positive electrode sheet and remove dust, the deviation correction sheet feeding mechanism is used to correct the positive electrode sheet after dust removal, and send the corrected positive electrode sheet to the first hot composite mechanism, and the first hot composite mechanism is used to hot press composite the positive electrode sheet and the negative electrode composite material strip to form a laminated composite material strip.

[0017] The thermal composite lamination device and lithium battery production line provided by the present invention have the following beneficial effects:

[0018] The present invention provides a thermal composite lamination device, wherein a first unwinding mechanism is used to unwind a positive electrode sheet strip, an active buffering mechanism, a fixed cutting mechanism, a vacuum sheet feeding and dust removal mechanism, a deviation correction sheet feeding mechanism and a first thermal composite mechanism are sequentially arranged along the feeding direction of the positive electrode sheet strip, the active buffering mechanism is used to buffer a positive electrode sheet strip of a preset length, the fixed cutting mechanism is used to cut the positive electrode sheet strip of a preset length to form a positive electrode sheet, the vacuum sheet feeding and dust removal mechanism is used to perform vacuum adsorption transportation and dust removal on the positive electrode sheet, the deviation correction sheet feeding mechanism is used to correct the positive electrode sheet after dust removal and send the corrected positive electrode sheet to the first thermal composite mechanism, and the first thermal composite mechanism is used to perform hot pressing composite on the positive electrode sheet and the negative electrode composite strip to form a laminated composite strip. Compared with the prior art, the hot composite stacking device provided by the present invention adopts an active buffering mechanism, a fixed cutting mechanism, a vacuum feeding and dust removal mechanism and a deviation correction feeding mechanism which are arranged in sequence along the feeding direction of the positive electrode sheet strip. Therefore, it can reduce the vibration generated during the cutting of the electrode sheet, improve the cutting effect, reduce the fluctuation of the short circuit rate of the battery cell, facilitate the mass production of the battery cell, avoid the displacement of the electrode position, and ensure the quality of the battery cell.

[0019] The lithium battery production line provided by the present invention includes a thermal composite lamination device, which can reduce the vibration generated during the cutting of pole pieces, improve the cutting effect, reduce the fluctuation of the short-circuit rate of the battery cell, facilitate the batch production of the battery cell, and avoid the displacement of the pole piece position to ensure the quality of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 A schematic structural diagram of a thermal composite lamination device provided in an embodiment of the present invention;

[0022] Figure 2 A schematic structural diagram of a first-viewing angle of view of a deviation-correcting and sheet-feeding mechanism in a thermal composite lamination device provided in an embodiment of the present invention;

[0023] Figure 3 A schematic structural diagram of a second viewing angle of a deviation-correcting and sheet-feeding mechanism in a thermal composite lamination device provided in an embodiment of the present invention;

[0024] Figure 4 A schematic structural diagram of a third viewing angle of a deviation-correcting and sheet-feeding mechanism in a thermal composite lamination device provided in an embodiment of the present invention;

[0025] Figure 5A schematic structural diagram of an active buffer mechanism in a thermal composite lamination device provided by an embodiment of the present invention from one perspective;

[0026] Figure 6 A schematic structural diagram of another perspective of the active buffer mechanism in the thermal composite lamination device provided by an embodiment of the present invention;

[0027] Figure 7 A schematic structural diagram of a cutting mechanism in a thermal composite lamination device provided in an embodiment of the present invention;

[0028] Figure 8 A schematic diagram of the structure of the diaphragm roller cutting mechanism in the thermal composite lamination device provided in an embodiment of the present invention when it is reset;

[0029] Fig. 9 A schematic structural diagram of the diaphragm roller cutting mechanism in the thermal composite lamination device provided in an embodiment of the present invention during cutting.

[0030] Icons: 100-hot composite lamination device; 110-frame; 120-first unwinding mechanism; 130-active buffer mechanism; 131-first fixed roller; 132-second fixed roller; 133-buffer driver; 134-buffer roller; 140-fixed cutting mechanism; 141-pulling driver; 142-pulling roller; 143-fixed cutting driver; 144-first cutter; 150-correction feeding mechanism; 151-correction feeding driver; 152-feeding table; 1521-guide rail; 153-first correction component; 1531-first driver; 1532-first cam; 1533-first rolling bearing; 154-correction frame; 1541-first waist hole; 1542-slide; 1543-rotating column; 155-second correction component; 1551-second driver; 1552-second cam Wheel; 1553-second rolling bearing; 156-carrying plate; 1561-second waist-shaped hole; 1562-limiting hole; 157-vacuum suction cup; 160-first thermal composite mechanism; 170-second unwinding mechanism; 180-laser tracking cutting mechanism; 190-second thermal composite mechanism; 200-third unwinding mechanism; 210-diaphragm roller cutting mechanism; 211-auxiliary roller; 212-pressure roller; 213-heating element; 214-roller cutting drive element; 215-second cutter; 216-position sensor; 220-line scanning detection mechanism; 230-stacking mechanism; 240-vacuum sheet feeding and dust removal mechanism; 250-panoramic detection mechanism; 260-active over roller; 300-positive electrode sheet strip; 310-stacking composite strip; 320-negative electrode composite strip; 330-negative electrode sheet strip; 340-diaphragm strip. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0034] In the description of the present invention, it should be noted that the terms "inside", "outside", "upper", "lower", "horizontal", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the product of the invention is usually placed when in use, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0035] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connect", "install", and "connect" 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 elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the features of the following embodiments can be combined with each other.

[0037] Please refer to Figure 1The embodiment of the present invention provides a lithium battery production line (not shown) for producing lithium batteries. It can reduce the vibration generated when cutting the pole piece, improve the cutting effect, reduce the fluctuation of the short circuit rate of the battery cell, facilitate the mass production of the battery cell, and avoid the displacement of the pole piece position to ensure the quality of the battery cell.

[0038] The lithium battery production line includes a thermal composite lamination device 100 and an assembly device (not shown). The thermal composite lamination device 100 is connected to the assembly device, and the thermal composite lamination device 100 is used to produce battery cells and send the battery cells to the assembly device, and the assembly device is used to assemble multiple battery cells to form a lithium battery.

[0039] The thermal composite lamination device 100 includes a frame 110 and a first unwinding mechanism 120 , an active buffering mechanism 130 , a fixed cutting mechanism 140 , a vacuum sheet feeding and dust removal mechanism 240 , a deflection correction sheet feeding mechanism 150 and a first thermal composite mechanism 160 installed on the frame 110 . The first unwinding mechanism 120 is used to unwind the positive electrode sheet material strip 300. The active buffering mechanism 130, the fixed cutting mechanism 140, the vacuum sheet feeding and dust removal mechanism 240, the correcting sheet feeding mechanism 150 and the first thermal composite mechanism 160 are arranged in sequence along the feeding direction of the positive electrode sheet material strip 300. The active buffering mechanism 130 is used to buffer the positive electrode sheet material strip 300 of a preset length. The fixed cutting mechanism 140 is used to cut the positive electrode sheet material strip 300 of a preset length to form a positive electrode sheet. The vacuum sheet feeding and dust removal mechanism 240 is used to vacuum adsorb and transport the positive electrode sheet and remove dust. The correcting sheet feeding mechanism 150 is used to correct the positive electrode sheet after dust removal and send the corrected positive electrode sheet to the first thermal composite mechanism 160. The first thermal composite mechanism 160 is used to hot-press and composite the positive electrode sheet and the negative electrode composite material strip 320 to form a laminated composite material strip 310.

[0040] Specifically, during the process of the first unwinding mechanism 120 unwinding the positive electrode sheet strip 300, the unwinding speed of the first unwinding mechanism 120 remains unchanged, and the active buffer mechanism 130 buffers a preset length of the positive electrode sheet strip 300. After the fixed cutting mechanism 140 cuts out the previous positive electrode sheet, the positive electrode sheet strip 300 buffered in the active buffer mechanism 130 is accelerated (relative to the unwinding speed) and sent to the fixed cutting mechanism 140, so that the fixed cutting mechanism 140 can cut out the next positive electrode sheet. During the cutting process of the fixed cutting mechanism 140, the active buffer mechanism 130 continues to buffer the next preset length of the positive electrode sheet strip 300. This cycle is repeated to achieve continuous cutting of multiple positive electrode sheets while ensuring that the unwinding speed remains unchanged. In this way, the positive electrode sheet is cut in a fixed cutting manner. Compared with the flying cutting method in the prior art, this can ensure the stability of dust and burrs on the cutting edge of the positive electrode sheet, reduce the vibration generated during the cutting of the electrode sheet, improve the cutting effect, reduce the fluctuation of the short circuit rate of the battery cell, and facilitate the mass production of the battery cell.

[0041] Furthermore, after the positive electrode sheet is cut, the vacuum belt in the vacuum feeding and dust removal mechanism 240 is used to vacuum adsorb the positive electrode sheet to drive the positive electrode sheet forward. In this process, the brush and dust box in the vacuum feeding and dust removal mechanism 240 are used to remove dust from the surface of the positive electrode sheet to reduce the short circuit rate of the battery cell. However, during the feeding process of the vacuum feeding and dust removal mechanism 240, since the positive electrode sheet is adsorbed on the vacuum belt, its position is not completely fixed, and since the brush will contact the positive electrode sheet during dust removal, and the frame 110 vibrates during the operation of the thermal composite lamination device 100, the positive electrode sheet may be offset. Therefore, the positive electrode sheet is corrected by the correction feeding mechanism 150, and the corrected positive electrode sheet is sent to the first thermal composite mechanism 160 to avoid the position of the positive electrode sheet from being offset, to ensure the quality of the subsequent hot pressing composite, and thus to ensure the quality of the battery cell.

[0042] Please refer to Figures 2 to 4 The deflection correction and film feeding mechanism 150 includes a deflection correction and feeding drive 151, a film feeding platform 152, a first deflection correction component 153, a deflection correction frame 154, a second deflection correction component 155 and a supporting plate 156. The deflection correction and feeding drive 151 is installed on the frame 110 and connected to the film feeding platform 152. The deflection correction and feeding drive 151 is used to drive the film feeding platform 152 to move along the first direction. The first deflection correction component 153 is installed on the film feeding platform 152 and connected to the deflection correction frame 154. The first deflection correction component 153 is used to drive the deflection correction frame 154 to move along the second direction. The second deflection correction component 155 is installed on the deflection correction frame 154 and connected to the supporting plate 156. The second deflection correction component 155 is used to drive the supporting plate 156 to rotate on a preset plane. The supporting plate 156 is used to carry the positive electrode sheet.

[0043] Specifically, the first direction is perpendicular to the second direction, and the planes where the first direction and the second direction are located are parallel to the preset plane. The correcting driving member 151 can drive the positive electrode sheet to move in the first direction through the film feeding platform 152, the first correcting assembly 153, the correcting frame 154, the second correcting assembly 155 and the supporting plate 156 in sequence, the first correcting assembly 153 can drive the positive electrode sheet to move in the second direction through the correcting frame 154, the second correcting assembly 155 and the supporting plate 156 in sequence, the second correcting assembly 155 can drive the positive electrode sheet to rotate on the preset plane through the supporting plate 156, and the correcting driving member 151, the first correcting assembly 153 and the second correcting assembly 155 work together to achieve the adjustment of various positions and angles of the positive electrode sheet on the preset plane, thereby improving the correction accuracy.

[0044] In this embodiment, the first direction is the feeding direction of the positive electrode sheet. On the one hand, the correcting feeding drive member 151 can drive the positive electrode sheet to move along the first direction through the feeding platform 152 to feed the positive electrode sheet to the first thermal composite mechanism 160, thereby realizing the feeding function of the positive electrode sheet; on the other hand, the correcting feeding drive member 151 can drive the positive electrode sheet to move along the first direction through the feeding platform 152 to fine-tune the position of the positive electrode sheet in the first direction, thereby realizing the deviation correction function of the positive electrode sheet in the first direction.

[0045] The first deviation-correcting assembly 153 includes a first driving member 1531, a first cam 1532 and a first rolling bearing 1533. The deviation-correcting frame 154 is provided with a first waist-shaped hole 1541. The first driving member 1531 is mounted on the film feeding platform 152 and connected to the first cam 1532. The first driving member 1531 is used to drive the first cam 1532 to rotate. The first rolling bearing 1533 is sleeved outside the first cam 1532 and is arranged in the first waist-shaped hole 1541. The first rolling bearing 1533 can rotate relative to the first cam 1532 and relative to the inner wall of the first waist-shaped hole 1541. Furthermore, the film feeding platform 152 is provided with a guide rail 1521 extending along the second direction, and the deviation correction frame 154 is provided with a slide 1542 , which is slidably matched with the guide rail 1521 . The slide 1542 can slide relative to the guide rail 1521 , and the guide rail 1521 can guide and limit the slide 1542 .

[0046] Specifically, in the process of the first driving member 1531 driving the first cam 1532 to rotate, the first cam 1532 moves in the first waist-shaped hole 1541 to drive the correction frame 154 to move through the cooperation of the first rolling bearing 1533 and the first waist-shaped hole 1541. In this process, due to the limiting function of the guide rail 1521 on the slide 1542, the correction frame 154 can only move along the second direction to drive the positive electrode sheet to move along the second direction, thereby fine-tuning the position of the positive electrode sheet in the second direction, and then realizing the correction function of the positive electrode sheet in the second direction.

[0047] The second deviation-correcting assembly 155 includes a second driving member 1551, a second cam 1552, and a second rolling bearing 1553. The bearing plate 156 is provided with a second waist-shaped hole 1561. The second driving member 1551 is mounted on the deviation-correcting frame 154 and connected to the second cam 1552. The second driving member 1551 is used to drive the second cam 1552 to rotate. The second rolling bearing 1553 is sleeved outside the second cam 1552 and is arranged in the second waist-shaped hole 1561. The second rolling bearing 1553 can rotate relative to the second cam 1552 and the inner wall of the second waist-shaped hole 1561. Furthermore, the deviation correction frame 154 is provided with a rotating column 1543 extending along a third direction, the third direction is perpendicular to the preset plane, the supporting plate 156 is provided with a limiting hole 1562, the limiting hole 1562 is spaced apart from the second waist-shaped hole 1561, the rotating column 1543 is rotatably matched with the limiting hole 1562, and the supporting plate 156 can rotate relative to the rotating column 1543.

[0048] Specifically, in the process of the second driving member 1551 driving the second cam 1552 to rotate, the second cam 1552 moves in the second waist-shaped hole 1561 to drive the bearing plate 156 to move through the cooperation between the second rolling bearing 1553 and the second waist-shaped hole 1561. In this process, due to the limiting function of the rotating column 1543 on the limiting hole 1562, the bearing plate 156 can only rotate around the third direction on the preset plane to drive the positive electrode plate to rotate on the preset plane, thereby fine-tuning the angle of the positive electrode plate on the preset plane, and then realizing the angle correction function of the positive electrode plate on the preset plane.

[0049] Preferably, the deflection correction and film feeding mechanism 150 further includes a vacuum suction cup 157. The vacuum suction cup 157 is connected to the carrier plate 156, and is used to vacuum adsorb the positive electrode sheet to fix the relative position of the positive electrode sheet and the carrier plate 156, so as to facilitate the deflection correction operation. Specifically, the carrier plate 156 can synchronously drive the vacuum suction cup 157 to move during the movement process, thereby driving the positive electrode sheet adsorbed on the vacuum suction cup 157 to move, thereby realizing the deflection correction function.

[0050] Please refer to Figures 5 and 6 The active buffer mechanism 130 includes a first fixed roller 131, a second fixed roller 132, a buffer driver 133 and a buffer roller 134. The buffer roller 134 is disposed between the first fixed roller 131 and the second fixed roller 132. The first fixed roller 131, the buffer roller 134 and the second fixed roller 132 are used to cooperate with the positive electrode sheet strip 300 in sequence. The buffer driver 133 is connected to the buffer roller 134. The buffer driver 133 is used to drive the buffer roller 134 to approach or move away from the first fixed roller 131 and the second fixed roller 132 to achieve the buffering and resetting functions of the positive electrode sheet strip 300.

[0051] Specifically, in the process of the cache driving member 133 driving the cache roller 134 away from the first fixed roller 131 and the second fixed roller 132, the distance between the cache roller 134 and the first fixed roller 131 and the second fixed roller 132 gradually increases, and the positive electrode sheet strip 300 is stretched under the drive of the cache roller 134 and cached between the first fixed roller 131 and the second fixed roller 132. During this process, the first unwinding mechanism 120 continues to unwind at a uniform speed, and the first fixed roller 131, the cache roller 134 and the second fixed roller 132 all rotate at a uniform speed relative to the positive electrode sheet strip 300 to ensure the stability of the cache function. In the process of the cache driving member 133 driving the cache roller 134 to approach the first fixed roller 131 and the second fixed roller 132, the distance between the cache roller 134 and the first fixed roller 131 and the second fixed roller 132 gradually decreases, and the cache roller 134 gradually resets, and the positive electrode sheet strip 300 cached between the first fixed roller 131 and the second fixed roller 132 is pulled out by the cutting mechanism 140. During this process, the first unwinding mechanism 120 also continues to unwind at a uniform speed, and the first fixed roller 131, the cache roller 134 and the second fixed roller 132 all rotate at a uniform speed relative to the positive electrode sheet strip 300 to ensure the stability of the reset function.

[0052] Please refer to Figure 7 The fixed cutting mechanism 140 includes a material pulling drive 141, a material pulling roller 142, a fixed cutting drive 143 and a first cutter 144. The material pulling drive 141 is connected to the material pulling roller 142, and the material pulling roller 142 is used to cooperate with the positive electrode sheet material strip 300. The material pulling drive 141 is used to pull out the positive electrode sheet material strip 300 of a preset length cached in the active buffer mechanism 130 through the material pulling roller 142. The fixed cutting drive 143 is connected to the first cutter 144, and the fixed cutting drive 143 is used to drive the first cutter 144 to cut the positive electrode sheet material strip 300 to form a positive electrode sheet.

[0053] Specifically, during the operation of the fixed-cutting mechanism 140, the pulling drive 141 is first used to drive the pulling roller 142 to move (the movement speed is greater than the unwinding speed of the first unwinding mechanism 120) to pull the positive electrode sheet strip 300 of a preset length cached in the active buffer mechanism 130 to a position corresponding to the first cutter 144; then the fixed-cutting drive 143 is used to drive the first cutter 144 to move to cut the positive electrode sheet strip 300 of a preset length to form a positive electrode sheet.

[0054] Please continue to refer to Figure 1In this embodiment, the number of the first unwinding mechanism 120, the active buffering mechanism 130, the fixed cutting mechanism 140 and the correcting and feeding mechanism 150 are all two, wherein the two first unwinding mechanisms 120 are relatively arranged on both sides of the negative electrode composite material strip 320, each first unwinding mechanism 120 is used to unwind a positive electrode sheet material strip 300, each active buffering mechanism 130 is used to cache a positive electrode sheet material strip 300, each fixed cutting mechanism 140 is used to cut a positive electrode sheet material strip 300 to form a group of positive electrode sheets, and each correcting and feeding mechanism 150 is used to send a group of positive electrode sheets to the first thermal composite mechanism 160 in sequence. Specifically, one deflection-correcting and sheet-feeding mechanism 150 is used to sequentially and intermittently deliver a group of positive electrode sheets to one side of the negative electrode composite material strip 320, and another deflection-correcting and sheet-feeding mechanism 150 is used to sequentially and intermittently deliver another group of positive electrode sheets to the other side of the negative electrode composite material strip 320, so that the two groups of positive electrode sheets are alternately arranged in sequence, thereby ensuring the hot pressing composite effect of the negative electrode composite material strip 320 and the two groups of positive electrode sheets.

[0055] Preferably, the thermal composite lamination device 100 further includes a second unwinding mechanism 170, a laser cutting mechanism 180, a second thermal composite mechanism 190 and two third unwinding mechanisms 200. The second unwinding mechanism 170, the laser cutting mechanism 180, the third unwinding mechanism 200 and the second thermal composite mechanism 190 are all installed on the frame 110, the second unwinding mechanism 170 is used to unwind the negative electrode sheet material strip 330, the laser cutting mechanism 180 is used to laser cut the negative electrode sheet material strip 330 to form a negative electrode sheet, each third unwinding mechanism 200 is used to unwind a separator material strip 340, and the second thermal composite mechanism 190 is used to perform hot pressing composite of the negative electrode sheet and two layers of separator to form a negative electrode composite material strip 320. Specifically, the multiple negative electrode sheets cut by the laser cutting mechanism 180 enter the second thermal composite mechanism 190 in sequence and at intervals. At the same time, a third unwinding mechanism 200 delivers a layer of separator to one side of the multiple negative electrode sheets, and another third unwinding mechanism 200 delivers another layer of separator to the other side of the multiple negative electrode sheets. Thereafter, the second thermal composite mechanism 190 is used to perform hot pressing composite on a layer of separator, multiple negative electrode sheets and another layer of separator to form a negative electrode composite material strip 320.

[0056] In this embodiment, the negative electrode sheet is cut by laser tracking cutting, and the laser beam tracking cutting angle is 50° to 80° to ensure the tracking cutting effect. However, it is not limited to this. In other embodiments, the negative electrode sheet can also be cut by fixed cutting (the cutting structure is the same as the cutting structure of the positive electrode sheet), and the cutting method of the negative electrode sheet is not specifically limited.

[0057] Preferably, the hot composite lamination device 100 further includes a diaphragm roller cutting mechanism 210, a line scanning detection mechanism 220 and a lamination mechanism 230. The diaphragm roller cutting mechanism 210, the line scanning detection mechanism 220 and the lamination mechanism 230 are all installed on the frame 110, and are arranged in sequence along the feeding direction of the laminated composite material strip 310. The diaphragm roller cutting mechanism 210 is used to cut off the blank area of ​​the laminated composite material strip 310 to separate the front and rear battery cells. The line scanning detection mechanism 220 is used to detect whether the laminated composite material strip 310 has quality defects. The lamination mechanism 230 is used to laminate the laminated composite material strip 310 to form a battery cell.

[0058] Preferably, the thermal composite lamination device 100 further includes a panoramic detection mechanism 250 and an active roller 260. The panoramic detection mechanism 250 and the active roller 260 are both arranged between the first thermal composite mechanism 160 and the diaphragm roller cutting mechanism 210, that is, the first thermal composite mechanism 160, the panoramic detection mechanism 250, the active roller 260, the diaphragm roller cutting mechanism 210, the line scanning detection mechanism 220 and the lamination mechanism 230 are arranged in sequence along the feeding direction of the laminated composite material strip 310, the panoramic detection mechanism 250 is used to perform a panoramic detection on the laminated composite material strip 310, and the active roller 260 is used to drive the laminated composite material strip 310 to be conveyed forward.

[0059] In the present invention, the laminated composite material strip 310 output from the first thermal composite mechanism 160 quickly reaches the laminated mechanism 230 after passing through the panoramic detection mechanism 250, the active roller 260, the diaphragm roller cutting mechanism 210 and the line scanning detection mechanism 220. Compared with the prior art, the transmission distance of the laminated composite material strip 310 (the distance from the first thermal composite mechanism 160 to the laminated mechanism 230) is greatly shortened, the transmission time is shortened, and the production efficiency is improved; and the traditional multiple driven rollers are eliminated and replaced with an active roller 260, which can effectively reduce the motion inertia of start-stop acceleration and deceleration, reduce the friction between the active roller 260 and the laminated composite material strip 310, and at the same time increase the diameter, reduce the turning angle of the laminated composite material strip 310, and reduce the number of rollers in contact with the laminated composite material strip 310 while ensuring the transmission efficiency, thereby reducing the friction powder loss of the laminated composite material strip 310 (laminated composite material strip 310 The cut edge of the positive electrode sheet may rub and fall off when in contact with the roller), thereby reducing the risk of dust contaminating the battery cell and causing a short circuit; in addition, since the transmission distance is short, the composite pressure of the first thermal composite mechanism 160 on the laminated composite material strip 310 can be appropriately reduced (if the transmission distance is long, in order to prevent the sheet from falling, a larger composite pressure is required to press and adhere the positive electrode sheet to the diaphragm), reducing the adverse effects of the first thermal composite mechanism 160 on the positive electrode sheet and the diaphragm (excessive composite pressure will cause the cut edge of the positive electrode sheet to fall off, and on the other hand, it will make the diaphragm thinner. Both of these negative effects will lead to an increase in the short circuit rate of the battery cell), thereby reducing the short circuit rate.

[0060] Furthermore, in the present invention, the line scanning detection mechanism 220 is located at the previous station of the stacking mechanism 230, that is, the line scanning detection is the last process before the stacking of the stacking composite material strip 310. Compared with the scheme in the prior art in which there are multiple processes between the line scanning process and the stacking process, more accurate data before stacking can be obtained according to the interface image of the stacking composite material strip 310 obtained by the line scanning detection mechanism 220 (if there are multiple processes between the line scanning process and the stacking process, these processes may cause damage to the stacking composite material strip 310, resulting in inaccurate line scanning detection results), thereby improving the monitoring effect of the battery cell quality.

[0061] Please refer to Figures 8 to 9 It should be noted that the blank area of ​​the laminated composite material strip 310 is a longer blank material segment on the laminated composite material strip 310 where neither the positive electrode sheet nor the negative electrode sheet is arranged but only two layers of diaphragms (the shorter blank material segment is normal and does not belong to the blank area). The blank area is the diaphragm gap reserved between the previous battery cell and the next battery cell. After cutting off the blank area, the front and rear battery cells can be separated.

[0062] The diaphragm roll cutting mechanism 210 includes an auxiliary roller 211, a pressure roller 212, a heating element 213, a roll cutting driving element 214 and a second cutter 215. The auxiliary roller 211 and the pressure roller 212 are arranged in parallel, and the space between the auxiliary roller 211 and the pressure roller 212 is used for the laminated composite material strip 310 to pass through, and the auxiliary roller 211 is used to assist in driving the laminated composite material strip 310 to be fed forward. The roll cutting driving element 214 is connected to the pressure roller 212, and the roll cutting driving element 214 is used to drive the pressure roller 212 to rotate. The second cutter 215 is installed on the circumferential surface of the pressure roller 212 and is connected to the heating element 213, and the heating element 213 is used to heat the second cutter 215. Specifically, when the blank area of ​​the laminated composite material strip 310 enters between the auxiliary roller 211 and the pressure roller 212, the roller cutting drive 214 is used to drive the second cutter 215 to rotate through the pressure roller 212. When the second cutter 215 is accelerated to a linear speed that is the same as the feeding speed of the laminated composite material strip 310, the second cutter 215 contacts the blank area of ​​the laminated composite material strip 310. At this time, the laminated composite material strip 310 is melted under the high temperature of the second cutter 215 (heated by the heating element 213) to achieve the cutting of the blank area. In addition, under the high temperature of the second cutter 215, the two layers of the diaphragm in the blank area can also be hot-melted to achieve a sealing effect, thereby preventing the negative electrode powder between the two layers of the diaphragm from falling out and contaminating the battery cell, thereby avoiding the appearance of the battery cell being poor.

[0063] Preferably, the diaphragm roller cutting mechanism 210 also includes a position sensor 216. The position sensor 216 is used to detect the position of the blank area in the laminated composite material strip 310. When the position sensor 216 detects that the blank area of ​​the laminated composite material strip 310 is about to enter between the auxiliary roller 211 and the pressure roller 212, the position sensor 216 sends a control signal to the roller cutting driver 214 to control the roller cutting driver 214 to drive the pressure roller 212 to rotate, thereby driving the second cutter 215 to cut the blank area of ​​the laminated composite material strip 310. After the cutting is completed, the roller cutting driver 214 drives the pressure roller 212 to rotate and reset, thereby driving the second cutter 215 to reset to wait for the next cutting operation. Furthermore, the heating element 213 is always in a working state during the battery cell stacking process, so that the second cutter 215 always maintains a preset temperature, so that the second cutter 215 can cut the blank area of ​​the laminated composite material strip 310 at any time.

[0064] The thermal composite lamination device 100 provided in the embodiment of the present invention comprises a first unwinding mechanism 120 for unwinding the positive electrode sheet strip 300, an active buffering mechanism 130, a fixed cutting mechanism 140, a vacuum sheet feeding and dust removal mechanism 240, a deviation correction sheet feeding mechanism 150 and a first thermal composite mechanism 160 which are sequentially arranged along the feeding direction of the positive electrode sheet strip 300, the active buffering mechanism 130 for buffering the positive electrode sheet strip 300 of a preset length, the fixed cutting mechanism 140 for cutting the positive electrode sheet strip 300 of a preset length to form a positive electrode sheet, the vacuum sheet feeding and dust removal mechanism 240 for vacuum adsorption transportation and dust removal of the positive electrode sheet, the deviation correction sheet feeding mechanism 150 for correcting the positive electrode sheet after dust removal and sending the corrected positive electrode sheet to the first thermal composite mechanism 160, and the first thermal composite mechanism 160 for hot pressing and composite the positive electrode sheet and the negative electrode composite strip 320 to form a laminated composite strip 310. Compared with the prior art, the hot composite lamination device 100 provided by the present invention adopts the active buffer mechanism 130, the fixed cutting mechanism 140, the vacuum feeding and dust removal mechanism 240 and the deviation correction feeding mechanism 150 which are sequentially arranged along the feeding direction of the positive electrode sheet material strip 300, so it can reduce the vibration generated when the electrode sheet is cut, improve the cutting effect, reduce the fluctuation of the short circuit rate of the battery cell, facilitate the mass production of the battery cell, and avoid the displacement of the electrode sheet position, so as to ensure the quality of the battery cell. The lithium battery production line has high production efficiency and good product quality.

[0065] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A thermal composite lamination device, characterized in that: It includes a frame and a first unwinding mechanism, an active buffering mechanism, a fixed cutting mechanism, a vacuum sheet feeding and dust removal mechanism, a deflection correction sheet feeding mechanism and a first hot composite mechanism installed on the frame. The first unwinding mechanism is used to unwind the positive electrode sheet material strip. The active buffering mechanism, the fixed cutting mechanism, the vacuum sheet feeding and dust removal mechanism, the deflection correction sheet feeding mechanism and the first hot composite mechanism are arranged in sequence along the feeding direction of the positive electrode sheet material strip. The active buffering mechanism is used to buffer the positive electrode sheet material strip of a preset length. The fixed cutting mechanism is used to cut the positive electrode sheet material strip of the preset length to form a positive electrode sheet. The vacuum sheet feeding and dust removal mechanism is used to vacuum absorb and transport the positive electrode sheet and remove dust. The deflection correction sheet feeding mechanism is used to correct the deflection of the positive electrode sheet after dust removal and send the corrected positive electrode sheet to the first hot composite mechanism. The first hot composite mechanism is used to hot press composite the positive electrode sheet and the negative electrode composite material strip to form a laminated composite material strip.

2. The thermal composite lamination device according to claim 1, characterized in that: The deflection correction and film feeding mechanism includes a deflection correction driving member, a film feeding platform, a first deflection correction component, a deflection correction frame, a second deflection correction component and a supporting plate. The deflection correction driving member is installed on the frame and connected to the film feeding platform. The deflection correction driving member is used to drive the film feeding platform to move along a first direction. The first deflection correction component is installed on the film feeding platform and connected to the deflection correction frame. The first deflection correction component is used to drive the deflection correction frame to move along a second direction. The second deflection correction component is installed on the deflection correction frame and connected to the supporting plate. The second deflection correction component is used to drive the supporting plate to rotate on a preset plane. The first direction is perpendicular to the second direction, and the plane where the first direction and the second direction are located is parallel to the preset plane.

3. The thermal composite lamination device according to claim 2, characterized in that: The first deviation-correcting assembly includes a first driving member, a first cam and a first rolling bearing. The deviation-correcting frame is provided with a first waist-shaped hole. The first driving member is mounted on the film-feeding platform and connected to the first cam. The first rolling bearing is sleeved outside the first cam and arranged in the first waist-shaped hole. The sheet feeding platform is provided with a guide rail extending along the second direction, and the deviation correcting frame is provided with a slide table, and the slide table is slidably matched with the guide rail.

4. The thermal composite lamination device according to claim 2, characterized in that: The second deviation-correcting assembly includes a second driving member, a second cam and a second rolling bearing. The bearing plate is provided with a second waist-shaped hole. The second driving member is mounted on the deviation-correcting frame and connected to the second cam. The second rolling bearing is sleeved outside the second cam and disposed in the second waist-shaped hole. The deviation-correcting frame is provided with a rotating column extending along a third direction, the third direction is perpendicular to the preset plane, the bearing plate is provided with a limiting hole, and the rotating column is rotatably matched with the limiting hole.

5. The thermal composite lamination device according to claim 2, characterized in that: The deviation-correcting and film-feeding mechanism further comprises a vacuum suction cup, which is connected to the carrying plate and is used for vacuum adsorption of the positive electrode sheet.

6. The thermal composite lamination device according to claim 1, characterized in that: The active caching mechanism includes a first fixed roller, a second fixed roller, a cache driving member and a cache roller. The cache roller is arranged between the first fixed roller and the second fixed roller. The first fixed roller, the cache roller and the second fixed roller are used to cooperate with the positive electrode sheet strip in sequence. The cache driving member is connected to the cache roller, and the cache driving member is used to drive the cache roller to approach or move away from the first fixed roller and the second fixed roller.

7. The thermal composite lamination device according to claim 1, characterized in that: The fixed-cut mechanism includes a material pulling drive, a material pulling roller, a fixed-cut drive and a first cutter, the material pulling drive is connected to the material pulling roller, the material pulling roller is used to cooperate with the positive electrode sheet strip, the material pulling drive is used to pull out the positive electrode sheet strip of preset length through the material pulling roller, the fixed-cut drive is connected to the first cutter, and the fixed-cut drive is used to drive the first cutter to cut the positive electrode sheet strip.

8. The thermal composite lamination device according to claim 1, characterized in that: The hot composite lamination device also includes a diaphragm roller cutting mechanism, a line scanning detection mechanism and a lamination mechanism. The diaphragm roller cutting mechanism, the line scanning detection mechanism and the lamination mechanism are all installed on the frame and are arranged in sequence along the feeding direction of the laminated composite material strip. The diaphragm roller cutting mechanism is used to cut off the blank area of ​​the laminated composite material strip, the line scanning detection mechanism is used to detect whether the laminated composite material strip has quality defects, and the lamination mechanism is used to laminate the laminated composite material strip.

9. The thermal composite lamination device according to claim 8, characterized in that: The diaphragm roller cutting mechanism includes an auxiliary roller, a pressure roller, a heating element, a roller cutting drive and a second cutter. The auxiliary roller and the pressure roller are arranged in parallel. The space between the auxiliary roller and the pressure roller is used for the laminated composite material strip to pass through. The roller cutting drive is connected to the pressure roller. The second cutter is installed on the circumferential surface of the pressure roller and is connected to the heating element. The heating element is used to heat the second cutter. The roller cutting drive is used to drive the pressure roller to rotate relative to the auxiliary roller so as to cut off the blank area of ​​the laminated composite material strip through the second cutter.

10. A lithium battery production line, characterized in that: It comprises the thermal composite lamination device as described in any one of claims 1 to 9.

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