Battery cell winding device and battery production line

Abstract

The present invention provides a battery cell winding device and a battery production line, wherein the battery cell winding device includes a frame, a first electrode sheet feeding mechanism, a first diaphragm feeding mechanism, a second electrode sheet feeding mechanism, a second diaphragm feeding mechanism, a first cutting mechanism, a first gluing mechanism, a compounding mechanism, a winding mechanism and a second cutting mechanism. In the above structure, the second cutting mechanism only cuts the diaphragm and the connecting tape, and the thickness of the two is relatively thin, so the second cutting mechanism will not be damaged and burrs will not be generated. In addition, the second electrode sheet material strip can maintain continuous feeding, eliminating the time for the second electrode sheet material strip to stop and wait, and improving the winding efficiency of the battery cell.

Description

Technical Field

[0001] The present invention relates to the technical field of battery production equipment, and in particular to a battery core winding device and a battery production line. Background Art

[0002] During the battery production process, the positive electrode sheet, the separator and the negative electrode sheet need to be stacked to form a battery cell. The battery cell can be formed by a variety of processes, one of which is the winding process. In the battery cell winding process, multiple layers of separators, positive electrode sheets and negative electrode sheets are wound by a winding head to form a battery cell. When a winding head winds a battery cell, the cutter cuts the material strip, and the turntable rotates and drives the winding head to the next station. Since the thickness of the electrode sheet is relatively thick and the hardness is relatively large, it is easy to damage the cutter by directly cutting the electrode sheet, and after cutting the electrode sheet, burrs are easy to be generated on the cutting edge of the electrode sheet, and the burrs are easy to pierce the separator and cause the battery cell to short-circuit. In order to solve the above problems, when the battery cell in the prior art is wound, the two layers of separators need to be thermally compounded between adjacent battery cells first (the electrode sheet does not participate in the thermal compound), so when cutting, only the separator is cut, and the electrode sheet is not cut.

[0003] However, in the above structure, during the thermal compounding of the diaphragm, the pole piece needs to be stopped from being transported, and the pole piece can only be transported again after the thermal compounding of the diaphragm is completed, that is, the pole piece cannot be transported continuously. In addition, the stopping, acceleration and deceleration of the pole piece all take up extra time, which affects the production cycle and production efficiency. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect in the prior art that the electrode sheets cannot be continuously transported when the battery cell is wound, which affects the production rhythm and production efficiency, thereby providing a battery cell winding device and a battery production line.

[0005] In order to solve the above problems, the present invention provides a battery cell winding device, comprising: a frame; a first pole piece feeding mechanism, a first diaphragm feeding mechanism, a second pole piece feeding mechanism and a second diaphragm feeding mechanism arranged in sequence, all of which are arranged on the frame; a first cutting mechanism and a first gluing mechanism, which are arranged on the frame and located at the second pole piece feeding mechanism, the first cutting mechanism is suitable for cutting the second pole piece material strip, the first gluing mechanism is suitable for gluing at the break of the second pole piece material strip and forming a connecting tape, the connecting tape connects the cut front and rear second pole piece material strips; a composite mechanism, The composite mechanism is arranged on the frame and located downstream of the first pole piece feeding mechanism, the first diaphragm feeding mechanism, the second pole piece feeding mechanism and the second diaphragm feeding mechanism, and is suitable for thermally composite the first diaphragm material strip, the connecting tape and the second diaphragm material strip to form a composite section; the winding mechanism and the second cutting mechanism are arranged on the frame and located downstream of the composite mechanism, and the winding mechanism is suitable for winding the first pole piece material strip, the first diaphragm material strip, the second pole piece material strip and the second diaphragm material strip to form a battery cell, and the second cutting mechanism is suitable for cutting off the part between the front and rear second pole piece material strips of the composite section.

[0006] Optionally, the first cutting mechanism is movably arranged upstream or downstream along the flow direction of the second pole piece strip.

[0007] Optionally, the first glue applying mechanism comprises a first glue applying plate and a second glue applying plate which are arranged opposite to each other, and the first glue applying plate and the second glue applying plate are movably arranged upstream or downstream along the flow direction of the second pole piece material strip.

[0008] Optionally, the battery cell winding device also includes a first clamping plate and a second clamping plate, both of which are arranged on the frame and can move upstream or downstream along the flow direction of the second electrode sheet material. The first clamping plate is located upstream of the first cutting mechanism and the first gluing mechanism, and the second clamping plate is located downstream of the first cutting mechanism and the first gluing mechanism. The first clamping plate is suitable for clamping the upstream part of the second electrode sheet material after cutting, and the second clamping plate is suitable for clamping the downstream part of the second electrode sheet material after cutting.

[0009] Optionally, the composite structure includes two hot pressing rollers arranged opposite to each other, and the hot pressing rollers can move closer to or away from each other; or, the composite structure includes a hot pressing roller and a passing roller arranged opposite to each other, the passing roller is fixedly arranged, and the hot pressing roller can move closer to or away from the passing roller.

[0010] Optionally, the battery cell winding device also includes a first gluing mechanism, which is arranged at the second pole piece feeding mechanism and is located downstream of the first cutting mechanism and the first gluing mechanism. The first gluing mechanism is suitable for spraying glue on both sides of the break of the second pole piece material strip.

[0011] Optionally, the battery cell winding device also includes two groups of first glue coating mechanisms, one group of first glue coating mechanisms is arranged at the first diaphragm feeding mechanism, and is suitable for spraying glue on the surface of the first diaphragm material strip facing the second pole piece material strip, and the other group of first glue coating mechanisms is arranged at the second diaphragm feeding mechanism, and is suitable for spraying glue on the surface of the second diaphragm material strip facing the second pole piece material strip.

[0012] Optionally, the winding mechanism includes a rotating plate, a plurality of winding heads are circumferentially arranged on the upper edge of the rotating plate, and a winding station and a finishing gluing station are provided on the frame. When the rotating plate rotates, the winding head can flow between the winding station and the finishing gluing station. The winding head is suitable for winding the first pole sheet material strip, the first diaphragm material strip, the second pole sheet material strip and the second diaphragm material strip to form a battery cell, and the second cutting mechanism is arranged at the winding station.

[0013] Optionally, adsorption holes are arranged on the outer circumferential surface of the winding head, and the adsorption holes are divided into a plurality of groups, and the plurality of groups of adsorption holes are arranged at intervals along the circumferential direction.

[0014] Optionally, the second cutting mechanism includes a knife frame and a roller cutter arranged on the knife frame, the knife frame can move close to or away from the winding head, and a first avoidance groove suitable for cooperating with the roller cutter is arranged on the outer peripheral surface of the winding head.

[0015] Optionally, a second avoidance groove suitable for cooperating with a blanking fixture is provided on the outer peripheral surface of the winding head.

[0016] Optionally, the battery cell winding device further includes a second gluing mechanism, which is disposed on the frame and located at a finishing gluing station.

[0017] Optionally, the battery cell winding device further comprises a second gluing mechanism, which is disposed between the composite mechanism and the winding station, and is suitable for spraying glue on the surface of the composite section facing the winding head.

[0018] The present invention also provides a battery production line, comprising the above-mentioned battery cell winding device.

[0019] The present invention has the following advantages:

[0020] By using the technical solution of the present invention, when winding a battery cell, when a battery cell is about to be wound, the first cutting mechanism cuts the upstream second pole piece tape, and then the first gluing mechanism glues the broken end of the second pole piece tape. Then the second pole piece tape continues to flow to the composite mechanism, and the composite mechanism thermally composites the first diaphragm tape, the connecting tape and the second diaphragm tape to form a composite section. Then the composite section continues to flow to the winding mechanism, and the second cutting mechanism cuts the composite section. The downstream of the composite section after cutting serves as the tail of the wound battery cell, and the upstream of the composite section after cutting serves as the head of the next battery cell to be wound. In the above structure, the second cutting mechanism only cuts the diaphragm and the connecting tape, and the thickness of the two is relatively thin, so the second cutting mechanism will not be damaged, and burrs will not be generated. In addition, the second pole piece tape can maintain continuous feeding, eliminating the time for the second pole piece tape to stop and wait, and improving the winding efficiency of the battery cell. Therefore, the technical solution of the present invention solves the defect in the prior art that the pole pieces cannot be continuously transported when the battery cell is wound, which affects the production cycle and production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 A schematic structural diagram of a first embodiment of a battery cell winding device according to the present invention is shown;

[0023] Figure 2 Shows Figure 1 The enlarged schematic diagram at A in the middle;

[0024] Figure 3 Shows Figure 2 A schematic diagram of the structure when the first cutting mechanism cuts the second pole piece strip;

[0025] Figure 4 Shows Figure 2 A schematic diagram of the structure when the first adhesive sticking mechanism sticks the connecting tape;

[0026] Figure 5 Shows Figure 1 A schematic diagram of the structure of the second pole piece strip after being processed by the first cutting mechanism and the first gluing mechanism;

[0027] Figure 6 Shows Figure 5 A schematic diagram of the structure after the second pole piece is thermally combined with the first diaphragm material strip and the second diaphragm material strip;

[0028] Figure 7 Shows Figure 1 Structural schematic diagram of the middle winding head and the second cutting structure;

[0029] Figure 8 Shows Figure 1 A schematic diagram of another form of the composite mechanism;

[0030] Fig. 9 A schematic structural diagram of a second embodiment of a battery cell winding device according to the present invention is shown;

[0031] Fig.10 A schematic structural diagram of a third embodiment of a battery cell winding device according to the present invention is shown;

[0032] Fig.11 A structural schematic diagram of a fourth embodiment of the battery cell winding device of the present invention is shown.

[0033] Description of reference numerals:

[0034] 1. First pole piece material strip; 2. First diaphragm material strip; 3. Second pole piece material strip; 4. Second diaphragm material strip; 5. Connecting tape; 6. Composite section; 10. First pole piece feeding mechanism; 20. First diaphragm feeding mechanism; 30. Second pole piece feeding mechanism; 40. Second diaphragm feeding mechanism; 50. First cutting mechanism; 51. Cutter; 52. Cutting seat; 60. First gluing mechanism; 61. First gluing board; 62. Second gluing board; 70. Composite mechanism; 71. Hot pressing roller; 72. Over roller; 80. Winding mechanism; 81. Turning plate; 82. Winding head; 821. Adsorption hole; 822. First avoidance groove; 8 23. Second avoidance groove; 90. Second cutting mechanism; 91. Knife holder; 92. Roller cutter; 101. Winding station; 102. Finishing gluing station; 103. Unloading station; 110. Second gluing mechanism; 121. First clamping plate; 122. Second clamping plate; 130. First gluing mechanism; 140. Second gluing mechanism; 151. First mounting plate; 152. First guide rail; 153. First linear drive mechanism; 161. Second mounting plate; 162. Second guide rail; 163. Second linear drive mechanism; 171. Third mounting plate; 172. Third guide rail; 173. Third linear drive mechanism. DETAILED DESCRIPTION

[0035] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0036] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0037] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0039] Embodiment 1

[0040] like Figure 1 and Figure 2 As shown, according to the embodiment 1 of a battery cell winding device of the present application, it includes a frame, a first electrode sheet feeding mechanism 10, a first diaphragm feeding mechanism 20, a second electrode sheet feeding mechanism 30, a second diaphragm feeding mechanism 40, a first cutting mechanism 50, a first gluing mechanism 60, a compounding mechanism 70, a winding mechanism 80, and a second cutting mechanism 90. The following describes each structure in detail:

[0041] The rack is used to install other components, and plays a role of supporting and providing an installation position. Further, the rack can be a vertical structure or a horizontal structure.

[0042] The first electrode sheet feeding mechanism 10, the first diaphragm feeding mechanism 20, the second electrode sheet feeding mechanism 30 and the second diaphragm feeding mechanism 40 are all arranged on the frame. The first electrode sheet feeding mechanism 10 is suitable for providing the first electrode sheet material strip 1, the first diaphragm feeding mechanism 20 is suitable for providing the first diaphragm material strip 2, the second electrode sheet feeding mechanism 30 is suitable for providing the second electrode sheet material strip 3, and the second diaphragm feeding mechanism 40 is suitable for providing the second diaphragm material strip 4. Among them, the polarity of the first electrode sheet material strip 1 and the second electrode sheet material strip 3 includes the following two situations: one is that the first electrode sheet material strip 1 is a positive electrode material strip and the second electrode sheet material strip 3 is a negative electrode material strip; the other is that the first electrode sheet material strip 1 is a negative electrode material strip and the second electrode sheet material strip 3 is a positive electrode material strip.

[0043] In this embodiment, the first electrode strip 1 is a positive electrode strip, and the second electrode strip 3 is a negative electrode strip.

[0044] Optionally, the first pole piece feeding mechanism 10 , the first diaphragm feeding mechanism 20 , the second pole piece feeding mechanism 30 and the second diaphragm feeding mechanism 40 may all include a driving roller, a passing roller, a deviation correction roller and the like.

[0045] Optionally, a cutter is further provided at the first pole sheet feeding mechanism 10 , and when a battery cell is almost finished winding, the cutter can cut off the first pole sheet material strip 1 .

[0046] Further, from Figure 1 It can be seen that the first electrode sheet feeding mechanism 10, the first diaphragm feeding mechanism 20, the second electrode sheet feeding mechanism 30 and the second diaphragm feeding mechanism 40 are arranged adjacent to each other in sequence. Therefore, when winding the battery cell, the material strips are stacked and wound in the manner of "positive electrode sheet-diaphragm-negative electrode sheet-diaphragm".

[0047] like Figure 1 and Figure 2 As shown, in the technical solution of this embodiment, the first cutting mechanism 50 and the first gluing mechanism 60 are both arranged on the frame and located at the second pole piece feeding mechanism 30. The first cutting mechanism 50 is suitable for cutting the second pole piece strip 3, and the first gluing mechanism 60 is suitable for gluing at the break of the second pole piece strip 3 and forming a connecting tape 5, which connects the cut front and rear second pole piece strips 3.

[0048] Specifically, when a battery cell is about to be wound, the first cutting mechanism 50 cuts and breaks the second pole piece strip 3, and a fracture is formed at the cutting position of the second pole piece strip 3. For ease of description, the second pole piece strip 3 located downstream after cutting is referred to as the front section, and the second pole piece strip 3 located upstream after cutting is referred to as the rear section.

[0049] like Figure 5As shown, after the first cutting mechanism 50 cuts the second pole piece strip 3 into a front section and a rear section, the first gluing mechanism 60 sticks the connecting tape 5 on the cut end of the second pole piece strip 3 (the connecting tape 5 is stuck on both sides of the second pole piece strip 3), that is, the front section and the rear section of the second pole piece strip 3 are connected by the connecting tape 5.

[0050] It should be noted that when the second electrode sheet material strip 3 is being cut and glued, the second electrode sheet material strip 3 is in a state of continuous conveying, that is, the second electrode sheet feeding mechanism 30 does not stop feeding and is in a state of continuous feeding.

[0051] like Figure 1 As shown, in the technical solution of this embodiment, the compounding mechanism 70 is arranged on the frame and is located downstream of the first electrode sheet feeding mechanism 10, the first diaphragm feeding mechanism 20, the second electrode sheet feeding mechanism 30 and the second diaphragm feeding mechanism 40. The compounding mechanism 70 is suitable for thermally compounding the first diaphragm material strip 2, the connecting tape 5 and the second diaphragm material strip 4 to form a compound section 6.

[0052] Specifically, when a battery cell is about to be wound, the composite mechanism 70 starts to work, composites the second pole piece strip 3 that has been cut and glued upstream with the first diaphragm strip 2 and the second diaphragm strip 4 to form a composite section 6.

[0053] It should be noted that if Figure 6 As shown, in this embodiment, the composite mechanism 70 performs thermal composite on the first diaphragm material strip 2, the second electrode material strip 3 and the second diaphragm material strip 4, and the thermal composite range is limited to the range where the connecting tape 5 is located. Therefore, the composite section 6 includes three sections. Figure 6 The directions shown include in sequence: the first section: including the stacked first diaphragm material tape 2, the connecting tape 5, the second pole piece material tape 3, the connecting tape 5 and the second diaphragm material tape 4; the second section: including the stacked first diaphragm material tape 2, the connecting tape 5 (two layers) and the second diaphragm material tape 4; the third section: including the stacked first diaphragm material tape 2, the connecting tape 5, the second pole piece material tape 3, the connecting tape 5 and the second diaphragm material tape 4.

[0054] Furthermore, in the first and second sections described above, the connecting tape 5 can cover the burrs on the broken edge of the second pole piece strip 3 , thereby eliminating the risk of the burrs on the second pole piece strip 3 subsequently piercing the diaphragm and causing a short circuit in the battery cell.

[0055] In some embodiments not shown, the connecting tape 5 may also be a double-sided tape. In this case, the composite mechanism 70 may perform roller composite. After rolling, one of the connecting tapes 5 adheres to the first diaphragm material strip 2 , and the other connecting tape 5 adheres to the second diaphragm material strip 4 .

[0056] like Figure 1As shown, the winding mechanism 80 and the second cutting mechanism 90 are both arranged on the frame and located downstream of the composite mechanism 70. The winding mechanism 80 is suitable for winding the first pole piece strip 1, the first diaphragm strip 2, the second pole piece strip 3 and the second diaphragm strip 4 to form a battery cell, and the second cutting mechanism 90 is arranged outside the winding mechanism 80, and the second cutting mechanism 90 is suitable for cutting the part between the front and rear second pole piece strips 3 of the composite section 6.

[0057] Specifically, when a cell on the winding mechanism 80 is about to be wound, the upstream first cutting mechanism 50 and the first gluing mechanism 60 cut and glue the second electrode strip 3. Then the glued part of the second electrode strip 3 is thermally compounded by the compounding mechanism 70 to form a compound section 6. After the cell is wound, the compound section 6 flows to the second cutting mechanism 90, which cuts the compound section 6, and the cut downstream part of the compound section 6 serves as the tail of the wound cell, and the cut upstream part of the compound section 6 serves as the head of the next cell to be wound.

[0058] It should be noted that the cutting position of the second cutting mechanism 90 is the above-mentioned second section position of the composite section 6, that is, the second cutting mechanism 90 does not cut the second pole piece strip 3, but only cuts the connecting tape 5, the first diaphragm strip 2 and the second diaphragm strip 4.

[0059] In some embodiments not shown, the second cutting mechanism 90 may also be arranged at other positions relative to the winding mechanism 80 , as long as the composite segment 6 can be cut.

[0060] According to the above structure, using the technical solution of this embodiment, when winding the battery cell, when a battery cell is about to be wound, the first cutting mechanism 50 cuts the upstream second pole piece tape 3, and then the first gluing mechanism 60 glues the broken end of the second pole piece tape 3. Then the second pole piece tape 3 continues to flow to the composite mechanism 70, and the composite mechanism 70 thermally composites the first diaphragm tape 2, the connecting tape 5 and the second diaphragm tape 4 to form a composite section 6. Then the composite section 6 continues to flow to the winding mechanism 80, and the second cutting mechanism 90 cuts the composite section 6. The downstream of the composite section 6 after cutting serves as the tail of the wound battery cell, and the upstream of the composite section 6 after cutting serves as the head of the next battery cell to be wound. In the above structure, the second cutting mechanism 90 only cuts the diaphragm and the connecting tape 5, and the thickness of the two is relatively thin, so the second cutting mechanism 90 will not be damaged, and no burrs will be generated. Furthermore, the second electrode sheet strip 3 can be continuously fed, eliminating the waiting time of the second electrode sheet strip 3, and improving the winding efficiency of the battery cell. Therefore, the technical solution of this embodiment solves the defect that the electrode sheet cannot be continuously fed during the winding of the battery cell in the prior art, which affects the production cycle and production efficiency.

[0061] like Figure 1and Figure 2 As shown, in the technical solution of this embodiment, the first cutting mechanism 50 includes a cutter 51 and a cutting seat 52 that are arranged opposite to each other, and the cutter 51 and the cutting seat 52 are movably arranged upstream or downstream along the flow direction of the second pole piece strip 3.

[0062] Optionally, the first cutting mechanism 50 may also be a laser cutting structure, a thermal radiation cutting structure, a heating wire cutting structure, etc., as long as it can cut the composite segment 6.

[0063] Specifically, Figure 2 The cutter 51 is illustrated in the direction shown, and is arranged above the cutting seat 52, and the second pole piece strip 3 passes through the gap between the cutter 51 and the cutting seat 52. The cutter 51 can move toward or away from the cutting seat 52 in the vertical direction. When it is not necessary to cut the second pole piece strip 3, there is a gap between the cutter 51 and the cutting seat 52, so that the second pole piece strip 3 can flow normally downstream. When it is necessary to cut the second pole piece strip 3, the cutter 51 moves toward the cutting seat 52, thereby cutting the second pole piece strip 3.

[0064] Furthermore, the cutter 51 and the cutting seat 52 can be synchronously moved upstream or downstream along the flow direction of the second electrode sheet strip 3. Figure 2 The direction shown is used to illustrate that the second pole piece strip 3 flows from right to left, so the left side is the downstream direction and the right side is the upstream direction. Since the second pole piece strip 3 is always conveyed during the cutting process, the second pole piece strip 3 needs to be "catch-up cut" between the cutter 51 and the cutting seat 52. Specifically, when the second pole piece strip 3 needs to be cut, the cutter 51 and the cutting seat 52 move from the initial position toward the downstream until their moving speeds are consistent with the conveying speed of the second pole piece strip 3, and then the cutter 51 moves toward the cutting seat 52 and cuts the second pole piece strip 3. After the cutting is completed, the cutter 51 moves away from the cutting seat 52, and the two move synchronously toward the upstream and return to the initial position.

[0065] like Figure 2 As shown, in the technical solution of this embodiment, the first glue mechanism 60 includes a first glue plate 61 and a second glue plate 62 arranged opposite to each other, and the first glue plate 61 and the second glue plate 62 are movably arranged upstream or downstream along the flow direction of the second pole piece strip 3.

[0066] Specifically, Figure 2Taking the direction shown as an example, the first glue plate 61 is located above the second glue plate 62, and the two are arranged opposite to each other. The second pole piece strip 3 can pass through the gap between the first glue plate 61 and the second glue plate 62. Furthermore, the first glue plate 61 and the second glue plate 62 can move closer to each other or away from each other. When it is necessary to glue the broken end of the second pole piece strip 3, the first glue plate 61 and the second glue plate 62 move closer to each other and clamp the broken end of the second pole piece strip 3, the first glue plate 61 sticks the connecting tape 5 to the upper side of the broken end of the second pole piece strip 3, and the second glue plate 62 sticks the connecting tape 5 to the lower side of the broken end of the second pole piece strip 3, thus forming a Figure 3 When the gluing is completed, the first gluing plate 61 and the second gluing plate 62 move away from each other and are separated from the second pole piece strip 3 .

[0067] Furthermore, since the second pole piece material strip 3 is always conveyed during the gluing process, the second pole piece material strip 3 needs to be "catch-up pasted" between the first gluing plate 61 and the second gluing plate 62. Specifically, when it is necessary to glue the broken end of the second pole piece material strip 3, the first gluing plate 61 and the second gluing plate 62 move from the initial position toward the downstream until their moving speeds are consistent with the conveying speed of the second pole piece material strip 3, and then the first gluing plate 61 and the second gluing plate 62 move toward each other and stick the connecting tape 5 to the broken end of the second pole piece material strip 3. After the gluing is completed, the first gluing plate 61 and the second gluing plate 62 move away from each other, and both move toward the upstream synchronously and return to the initial position.

[0068] like Figure 2 As shown, in the technical solution of this embodiment, the battery cell winding device also includes a first clamping plate 121 and a second clamping plate 122. The first clamping plate 121 and the second clamping plate 122 are both arranged on the frame and can move upstream or downstream along the flow direction of the second pole piece strip 3. The first clamping plate 121 is located upstream of the first cutting mechanism 50 and the first gluing mechanism 60, and the second clamping plate 122 is located downstream of the first cutting mechanism 50 and the first gluing mechanism 60. The first clamping plate 121 is suitable for clamping the upstream part of the cut second pole piece strip 3, and the second clamping plate 122 is suitable for clamping the downstream part of the cut second pole piece strip 3.

[0069] Specifically, the first clamping plate 121 and the second clamping plate 122 each include an upper clamping plate and a lower clamping plate. Figure 2The upper clamping plate is located above the second pole piece strip 3, and the lower clamping plate is located below the second pole piece strip 3. The upper clamping plate and the lower clamping plate are arranged opposite to each other in the vertical direction. When the second pole piece strip 3 needs to be clamped, the upper clamping plate and the lower clamping plate move closer to each other and clamp the second pole piece strip 3. When the second pole piece strip 3 does not need to be clamped, the upper clamping plate and the lower clamping plate move away from each other and release the second pole piece strip 3.

[0070] In addition, the first clamping plate 121 and the second clamping plate 122 can both move upstream or downstream along the flow direction of the second pole piece strip 3, so that when the first clamping plate 121 and the second clamping plate 122 clamp the second pole piece strip 3, the two can move synchronously with the second pole piece strip 3.

[0071] Furthermore, the functions of the first clamping plate 121 and the second clamping plate 122 are: when the second pole piece strip 3 is cut by the first cutting mechanism 50, the tension at the cut position disappears, so the second pole piece strip 3 loses support. After the second pole piece strip is cut by the first cutting mechanism 50 and before the first gluing mechanism 60 completes the gluing, the first clamping plate 121 and the second clamping plate 122 respectively clamp the upstream and downstream parts of the cut of the second pole piece strip 3 to provide support for the second pole piece strip 3.

[0072] Specifically, before the second pole piece strip 3 is cut, the first clamp 121 and the second clamp 122 both clamp the second pole piece strip 3, and both move downstream synchronously with the second pole piece strip 3. After the second pole piece strip 3 is cut, the first clamp 121 and the second clamp 122 can support the broken end of the second pole piece strip 3 to ensure smooth glue application. After the glue application is completed, the broken end of the second pole piece strip 3 is connected by the connecting tape 5, and the tension and supporting force are restored, so the first clamp 121 and the second clamp 122 can both release the second pole piece strip, and both move upstream to the initial position.

[0073] Optionally, the first clamping plate 121 and the second clamping plate 122 may also be in the form of friction rollers or damping rollers.

[0074] Figure 3 and Figure 4 The specific structures of the first cutting mechanism 50, the first gluing mechanism 60, the first clamping plate 121 and the second clamping plate 122 are further shown and described in detail below.

[0075] like Figure 3 and Figure 4As shown, the battery cell winding device also includes a first mounting plate 151, and a first guide rail 152 is provided on the frame, and the extension direction of the first guide rail 152 is the same as the flow direction of the second electrode strip 3. The first mounting plate 151 is connected to the first guide rail 152 through a slider, and the first mounting plate 151 is driven by a first linear drive mechanism 153 and can move on the first guide rail 152. The first cutting mechanism 50, the first gluing mechanism 60, the first clamping plate 121 and the second clamping plate 122 are all installed on the first mounting plate 151, so when the first mounting plate 151 moves, the four can move synchronously.

[0076] like Figure 3 and Figure 4 As shown, the first mounting plate 151 is provided with a second guide rail 162 and a third guide rail 172, which are respectively located at the two ends of the first mounting plate 151 (along the flow direction of the first pole piece strip 1), and the extension directions of the first guide rail 152, the second guide rail 162 and the third guide rail 172 are the same. The second guide rail 162 is connected to the second mounting plate 161 through a slider, and the second mounting plate 161 is driven by a second linear drive mechanism 163 and can slide on the second guide rail 162, and the first clamping plate 121 is arranged on the second mounting plate 161. The third guide rail 172 is connected to the third mounting plate 171 through a slider, and the third mounting plate 171 is driven by a third linear drive mechanism 173 and can slide on the third guide rail 172, and the second clamping plate 122 is arranged on the third mounting plate 171.

[0077] Furthermore, the first cutting mechanism 50 and the first gluing mechanism 60 are disposed between the second guide rail 162 and the third guide rail 172 .

[0078] Through the above structure, when the first mounting plate 151 moves on the first guide rail 152, the first clamping plate 121 and the second clamping plate 122 can move independently on the second guide rail 162 and the third guide rail 172 respectively, so as to adjust the gap therebetween to be located below the first cutting mechanism 50, or below the first gluing mechanism 60.

[0079] Based on the above structure, the specific steps of cutting and gluing the second pole piece strip 3 are introduced below (the flow direction of the second pole piece strip 2 is from right to left):

[0080] 1. If Figure 3 As shown, the first mounting plate 151 is initially located at the right end of the first guide rail 152, the second mounting plate 161 and the third mounting plate 171 are initially located at the right end of the corresponding guide rails, and the cutter 51 and the cutter seat 52 are located in the gap between the first clamping plate 121 and the second clamping plate 122;

[0081] 2. When the second pole piece strip 3 needs to be cut and glued, the first mounting plate 151 moves toward the left along the first guide rail 152 until the moving speed of the first mounting plate 151 is consistent with the moving flow speed of the second pole piece strip 3;

[0082] 3. The first clamping plate 121 and the second clamping plate 122 clamp the material strip, and the cutter 51 moves toward the cutting seat 52 to cut off the second pole piece material strip 3;

[0083] 4. The second mounting plate 161 and the third mounting plate 171 are both moved toward the left along the corresponding guide rails, so that the break of the second pole piece strip 3 (i.e., the gap between the first clamping plate 121 and the second clamping plate 122) moves to the position corresponding to the first adhesive plate 61 and the second adhesive plate 62;

[0084] 5. The first adhesive plate 61 and the second adhesive plate 62 are moved closer to each other, and the connecting tape 5 is attached to the front and back sides of the fracture of the second electrode strip 3;

[0085] 6. The first clamping plate 121 and the second clamping plate 122 both release the second pole piece strip, and the first mounting plate 151 , the second mounting plate 161 and the third mounting plate 171 all return to the initial positions of step 1 above.

[0086] It should be noted that, in order to facilitate the subsequent cutting of the composite section 6, the fracture positions of the second pole piece strip 3 need to be separated by a distance (such as Figure 5 and Figure 6 As shown), therefore, in the above step 4, the distance moved by the third mounting plate 171 is greater than the distance moved by the second mounting plate 161, so that a certain distance is pulled between the front section and the rear section of the second pole piece strip 3 after being cut.

[0087] Specifically, in the above step 3, corresponding to Figure 3 As shown in the figure, the gap between the first clamping plate 121 and the second clamping plate 122 is D1. In the above step 4, the corresponding Figure 4 As shown in the figure, the gap between the first clamping plate 121 and the second clamping plate 122 is D2, which is larger than D1.

[0088] Optionally, after the second pole piece strip 3 is cut, the distance between the front section and the rear section is preferably in the range of 10 mm to 50 mm, so the relationship between D1 and D2 mentioned above satisfies:

[0089] D2=D1+(10mm~50mm).

[0090] Furthermore, in order to ensure that the downstream position of the second pole piece strip 3 remains in a tensioned state after being cut, when performing the above step 4, the downstream winding mechanism 80 can adaptively increase the winding speed slightly to prevent the second pole piece strip 3 from wrinkling. The winding mechanism 80 increases the winding speed and conveys an additional distance, which is equal to the additional distance that the third mounting plate 171 moves relative to the second mounting plate 161, that is, within the above range of 10 mm to 50 mm.

[0091] In this embodiment, the function of the composite mechanism 70 is to thermally composite the connecting tape 5, the first diaphragm material strip 2 and the second diaphragm material strip 4 to form a composite section 6. The composite mechanism 70 can be arranged in two ways.

[0092] The first setting method is as follows: Figure 1 As shown, the composite mechanism 70 includes a hot pressing roller 71 and a roller 72 which are arranged opposite to each other, the roller 72 is fixedly arranged, and the hot pressing roller 71 can move close to or away from the roller 72. Specifically, the roller 72 is at room temperature and is fixedly arranged, and the roller 72 can provide tension to the first pole piece strip 1, the first diaphragm strip 2, the second pole piece strip 3, and the second diaphragm strip 4. The hot pressing roller 71 is arranged on the side of the roller 72, and the hot pressing roller 71 is configured to generate heat, and the hot pressing roller 71 can move close to or away from the roller 72.

[0093] When thermal bonding is not required, the hot pressing roller 71 is at a position away from the roller 72, and there is a gap between the hot pressing roller 71 and the roller 72. When thermal bonding is required, the hot pressing roller 71 moves toward the roller 72 and abuts against the roller 72, so as to thermally bond the connecting tape 5, the first diaphragm material strip 2 and the second diaphragm material strip 4 to form a composite section 6. After the thermal bonding is completed, the hot pressing roller 71 moves in a direction away from the roller 72 and resets.

[0094] The second setting method is as follows: Figure 8 As shown, the composite mechanism 70 includes two heat-pressing rollers 71 arranged opposite to each other, and the heat-pressing rollers 71 can move closer to or away from each other. Specifically, a roller can be separately arranged at the upstream position of the composite mechanism 70, and is used to provide tension to the first pole piece strip 1, the first diaphragm strip 2, the second pole piece strip 3 and the second diaphragm strip 4.

[0095] When thermal bonding is not required, the two hot pressing rollers 71 are at positions away from each other, and there is a gap between the two hot pressing rollers 71. When thermal bonding is required, the two hot pressing rollers 71 move toward each other and abut against each other, so as to thermally bond the connecting tape 5, the first diaphragm material strip 2, and the second diaphragm material strip 4 to form a composite section 6. After the thermal bonding is completed, the two hot pressing rollers 71 move away from each other and reset.

[0096] Optionally, when thermal lamination is not required, the gap between the two hot pressing rollers 71 can be adjusted so that the two hot pressing rollers 71 pre-compact the first pole piece strip 1 , the first diaphragm strip 2 , the second pole piece strip 3 and the second diaphragm strip 4 .

[0097] Furthermore, if Figure 1 As shown, two preheating plates are also arranged at the upstream position of the composite mechanism 70, one of which preheats the first diaphragm material strip 2, and the other preheats the second diaphragm material strip 4. Figure 4 It can be seen that the preheating range of the two preheating plates for the first diaphragm strip 2 and the second diaphragm strip 4 is only the range of the composite section 6 .

[0098] like Figure 1 As shown, in the technical solution of this embodiment, the winding mechanism 80 includes a rotating plate 81, on which a plurality of winding heads 82 are arranged along the circumferential direction, and the frame is provided with a winding station 101 and a finishing gluing station 102. When the rotating plate 81 rotates, the winding head 82 can flow between the winding station 101 and the finishing gluing station 102, and the winding head 82 is suitable for winding the first pole piece strip 1, the first diaphragm strip 2, the second pole piece strip 3 and the second diaphragm strip 4 to form a battery cell, and the second cutting mechanism 90 is arranged at the winding station 101.

[0099] Specifically, the winding head 82 can rotate by itself, and the rotating plate 81 can drive the winding head 82 to rotate circumferentially along the axis of the rotating plate 81. The winding head 82 winds the battery cell on the winding station 101, that is, the first electrode sheet strip 1, the first diaphragm strip 2, the second electrode sheet strip 3 and the second diaphragm strip 4 are wound to form a battery cell.

[0100] Optionally, the winding head 82 in this embodiment is a winding needle.

[0101] When a battery cell is almost finished winding, the first pole piece strip 1 is cut by a cutter, and the winding head 82 is rotated and moved to the finishing and gluing station 102 through the rotating plate 81, ready for finishing and gluing, and the previous empty winding head 82 is rotated and moved to the winding station 101, ready for winding a new battery cell. And the upstream second pole piece strip 3 is cut and glued by the first cutting mechanism 50 and the first gluing mechanism 60, and then at the compounding mechanism 70, the connecting tape 5, the first diaphragm strip 2 and the second diaphragm strip 4 are thermally compounded to form a composite section 6. When the composite section 6 flows to the winding station 101 and is attached to the winding head 82 of the winding station 101, the composite section 6 is cut by the second cutting mechanism 90.

[0102] Furthermore, after the composite section 6 is cut by the second cutting mechanism 90 , the downstream material strip serves as the tail of the last wound battery cell, and the upstream material strip serves as the head of the next battery cell to be wound.

[0103] Furthermore, the downstream material strip continues to be wound through the winding head 82 located at the finishing gluing station 102 and completes the finishing of the battery cell. After the battery cell is wound, the battery cell is glued and unloaded through the second gluing mechanism 110 arranged at the finishing gluing station 102.

[0104] from Figure 1 It can be seen that the second gluing mechanism 110 includes a swing arm and a gluing roller disposed at the end of the swing arm. When the battery cell has not been wound, the swing arm swings outward to make the gluing roller away from the winding head 82. When the battery cell is wound, the swing arm swings inward to make the gluing roller contact the battery cell, and the composite section 6 is tightly attached to the battery cell through the tape to complete the winding process.

[0105] Furthermore, the upstream material strip is fixed to the winding head 82 located at the finishing glue laminating station 102. The winding head 82 first performs pre-winding for several turns, and then the first pole sheet material strip 1 is fed to start the cell winding.

[0106] It is worth noting that when the second cutting mechanism 90 cuts the composite section 6, the cutting position is the second section of the composite section 6, that is, only the first diaphragm material strip 2, the connecting tape 5 and the second diaphragm material strip 4 are cut. The thickness and hardness of the three are reduced, so the second cutting mechanism 90 will not be damaged. In addition, the second cutting mechanism 90 does not cut the second pole piece material strip 3, so no cutting burrs are generated, eliminating the situation where the subsequent burrs pierce the diaphragm and cause the battery cell to short-circuit.

[0107] Alternatively, if Figure 1 As shown, a pressure roller is arranged outside the winding head 82 located at the winding station 101, and the pressure roller can be arranged close to or far from the winding head 82. Specifically, after the second cutting mechanism 90 cuts the composite section 6, the upstream material strip and the downstream material strip are disconnected and lose tension and lack support. Therefore, after the second cutting mechanism 90 cuts the composite section 6, the pressure roller presses the upstream material strip against the winding head 82, thereby providing tension to the material strip.

[0108] Alternatively, if Figure 1 As shown, a pressure roller is arranged outside the winding head 82 at the finishing gluing station 102, and the pressure roller can be arranged close to or far from the winding head 82. Specifically, after the second cutting mechanism 90 cuts the composite section 6, the upstream material strip and the downstream material strip are disconnected and lose tension and lack support. Therefore, after the second cutting mechanism 90 cuts the composite section 6, the pressure roller presses the downstream material strip against the winding head 82, thereby providing tension to the material strip.

[0109] Alternatively, if Figure 1As shown, a fixed roller and a pressure roller are provided between the winding station 101 and the finishing gluing station 102, and the material strip passes between the fixed roller and the pressure roller, and the pressure roller can move closer to or away from the fixed roller. Specifically, after the second cutting mechanism 90 cuts the composite section 6, the upstream material strip and the downstream material strip are disconnected and lose tension, lacking support. Since there is a certain distance between the winding station 101 and the finishing gluing station 102, in order to prevent the downstream material strip from falling downward due to loss of support, after the second cutting mechanism 90 cuts the composite section 6, the pressure roller moves toward the fixed roller and abuts against the fixed roller, thereby providing a support point for the downstream material strip until the downstream material strip is completely wound to the winding head 82 of the finishing gluing station 102 and the finishing is completed.

[0110] Alternatively, if Figure 1 As shown, a material unloading station 103 is also provided on the frame. Along the rotation direction of the rotating plate 81, the material unloading station 103 is located downstream of the finishing and gluing station 102, and is located upstream of the winding station 101, and the two adjacent ones are arranged at 120° in the circumferential direction. After the battery cell is finished and glued at the finishing and gluing station 102, the winding head 82 rotates from the finishing and gluing station 102 to the material unloading station 103, unloads the wound battery cell through the material unloading fixture, and transfers to the next process. After unloading, the empty winding head 82 waits for the winding head 82 located at the winding station 101 to complete the winding of the battery cell, and the rotating plate 81 rotates to drive the empty winding head 82 to move to the winding station 101 and wind the next battery cell.

[0111] In some embodiments not shown, the unloading station 103 may not be provided, and the finishing, gluing and unloading of the battery cells can be completed at the finishing and gluing station 102 .

[0112] like Figure 7 As shown, in the technical solution of this embodiment, adsorption holes 821 are provided on the outer circumferential surface of the winding head 82. The adsorption holes 821 are multiple groups, and the multiple groups of adsorption holes 821 are arranged at intervals along the circumferential direction. The adsorption holes 821 are used to adsorb and fix the upstream material strip on the winding head 82 after the composite section 6 is cut by the second cutting mechanism 90, so as to perform the battery cell winding process.

[0113] Furthermore, each group of adsorption holes 821 includes a plurality of holes, and a vacuum cavity is provided below each group of adsorption holes 821, and the vacuum cavity can be connected to an external negative pressure device. The vacuum cavity is connected to the adsorption holes 821, and negative pressure is formed on the surface of the winding head 82 to provide adsorption force.

[0114] Optionally, adjacent groups of adsorption holes 821 are arranged at intervals.

[0115] like Figure 7As shown, in the technical solution of this embodiment, the second cutting mechanism 90 includes a knife holder 91 and a roller cutter 92 arranged on the knife holder 91, the knife holder 91 can move close to or away from the winding head 82, and the outer peripheral surface of the winding head 82 is provided with a first avoidance groove 822 suitable for cooperating with the roller cutter 92. Specifically, a blade is provided on the roller cutter 92. When it is not necessary to cut the material strip, the knife holder 91 is in the initial position, and there is a gap between the roller cutter 92 and the winding head 82, and the material strip can pass through the gap. When the composite section 6 is about to flow to the surface of the winding head 82, the knife holder 91 moves toward the winding head 82, and the roller cutter 92 rotates, and the linear speed of the rotation is consistent with the linear speed of the winding head 82. When the second section of the composite section 6 flows to the cutting position, the first avoidance groove 822 is located below the second section of the composite section 6, and the roller cutter 92 rotates so that the blade is embedded in the first avoidance groove 822, thereby cutting the second section of the composite section 6.

[0116] During the cutting process, the blade is embedded in the first avoidance groove 822, thereby avoiding scratching the surface of the winding head 82. At the same time, the blade only cuts the first diaphragm material strip 2, the connecting tape 5, and the second diaphragm material strip 4, which are thinner and have lower hardness, to reduce damage to the blade. In addition, the blade does not cut the second pole piece material strip 3, and no burrs are generated after cutting, thereby avoiding the risk of subsequent burrs piercing the diaphragm and causing a short circuit in the battery cell.

[0117] Alternatively, if Figure 7 As shown, the first avoidance groove 822 is arranged between two adjacent groups of adsorption holes 821 .

[0118] like Figure 7 As shown, in the technical solution of this embodiment, a second avoidance groove 823 suitable for cooperating with a blanking fixture is provided on the outer circumference of the winding head 82. Specifically, part of the clamping claw of the blanking fixture can extend from the side of the winding head 82 into the second avoidance groove 823, so that the part of the clamping claw is located on the inner side of the wound battery cell, so the clamping claw can clamp the battery cell from the inner and outer sides of the battery cell, and remove the battery cell from the winding head 82.

[0119] Optionally, the second avoidance groove 823 is disposed between two adjacent groups of adsorption holes 821, and the two second avoidance grooves 823 are disposed opposite to each other at an angle of 180° in the circumferential direction. The two second avoidance grooves 823 are staggered with the first avoidance groove 822 in the circumferential direction.

[0120] According to the above structure, the working process of the battery cell winding device of this embodiment is as follows:

[0121] 1. When the winding of the battery cell at the winding station 101 is nearly finished, the rotating plate 81 rotates, and the winding head 82 at the winding station 101 switches the station. The wound battery cell rotates to the finishing gluing station 102, and the empty winding head 82 that has finished unloading the material at the unloading station 103 rotates to the winding station 101. The winding head 82 that has completed the finishing gluing at the finishing gluing station 102 rotates to the unloading station 103 to unload the battery cell. At this time, the material belt keeps conveying and circulating, and the empty winding head 82 is accelerated to the same speed as the material belt flow before rotating into place;

[0122] 2. The pressure rollers at the winding station 101 and the finishing gluing station 102 move toward the fixed rollers and press the material strip, the pressure roller at the finishing gluing station 102 moves toward the winding head 82 and presses the material strip, and the cutter at the first pole piece feeding mechanism 10 cuts the first pole piece material strip 1;

[0123] 3. The two heating plates heat the first diaphragm material strip 2 and the second diaphragm material strip 4 respectively. The heating length and position correspond to the size of the connecting tape 5 glued after the second electrode material strip 3 is cut. The hot pressing roller 71 moves toward the roller 72 and hot presses the first diaphragm material strip 2, the connecting tape 5, the second electrode material strip 3 and the second diaphragm material strip 4 to form a composite section 6. After the hot composite is completed, the hot pressing roller 71 moves and resets to the initial position;

[0124] 4. When the composite segment 6 flows to the winding head 82 of the winding station 101, the knife holder 91 moves toward the winding head 82, and the roller cutter 92 cuts off the second section of the composite segment 6. The adsorption holes 821 in the corresponding area on the winding head 82 are connected to negative pressure through the vacuum chamber, and the upstream of the cut composite segment 6 is adsorbed and fixed to carry out pre-rolling of the next battery cell. After the pre-rolling is completed, the first electrode sheet feeding mechanism 10 feeds the first electrode sheet strip 1 to the winding head 82 for winding until the battery cell is formed and the winding is completed. At the same time, the downstream of the cut composite segment 6 enters the winding head 82 of the finishing and gluing station 102 to continue to complete the finishing and gluing processes, and the previous battery cell that has completed the finishing and gluing processes is removed by the unloading fixture at the unloading station 103.

[0125] It should be noted that, in this embodiment, the second electrode strip 3 is a negative electrode, the first electrode strip 1 is a positive electrode, and the battery cell is wound in the form of "negative electrode wrapped in positive electrode". Therefore, when the battery cell starts to be wound, the second electrode strip 3 is wound first, that is, the electrode head of the composite section 6 is first pre-wound on the winding head 82, and the first electrode strip 1 is introduced after the pre-wound is completed. When the battery cell is about to be wound, the first electrode strip 1 is cut first, and after the downstream first electrode strip 1 is wound, the composite section 6 is cut to form the tail of the battery cell, that is, the second cutting mechanism 90 only cuts the composite section 6, and does not cut the first electrode strip.

[0126] Embodiment 2

[0127] like Fig. 9 As shown, the difference between the second embodiment of the battery cell winding device according to the present application and the first embodiment is that the battery cell winding device further includes a first glue coating mechanism 130. The first glue coating mechanism 130 is arranged at the second pole piece feeding mechanism 30, and is located downstream of the first cutting mechanism 50 and the first glue coating mechanism 60, and is located upstream of the composite mechanism 70. The first glue coating mechanism 130 is suitable for spraying glue on both sides of the fracture of the second pole piece strip 3.

[0128] Specifically, the first glue coating mechanism 130 can coat the front and back sides of the second electrode strip 3 with glue, and Figure 5 The glue-coating position is the position where the second pole piece strip 3 is cut and glue-coated, that is, glue is applied outside the connecting tape 5. No glue is applied at other positions of the second pole piece strip 3.

[0129] Optionally, the first glue coating mechanism 130 includes two glue coating heads, and the two glue coating heads are respectively located on the outer sides of two surfaces of the second pole piece strip 3 .

[0130] Furthermore, the glue applied by the first glue coating mechanism 130 is configured to be sticky after heating. Therefore, when the fracture of the second pole piece strip 3 passes through the hot pressing roller 71 of the composite mechanism 70, the glue is heated and becomes sticky, so that the first diaphragm strip 2 and the second diaphragm strip 4 are attached to the second pole piece strip 3, forming the above-mentioned composite section 6.

[0131] In the second embodiment, it is not necessary to provide a preheating plate at the first diaphragm feeding mechanism 20 and the second diaphragm feeding mechanism 40 .

[0132] Embodiment 3

[0133] like Fig.10 As shown, the difference between the third embodiment of the battery cell winding device according to the present application and the second embodiment described above is that the setting position of the first glue coating mechanism 130 is different. Specifically, two groups of first glue coating mechanisms 130 are set in the third embodiment, one of which is set at the first diaphragm feeding mechanism 20 and is suitable for spraying glue on the surface of the first diaphragm material strip 2 facing the second pole piece material strip 3, and the other group of first glue coating mechanisms 130 is set at the second diaphragm feeding mechanism 40 and is suitable for spraying glue on the surface of the second diaphragm material strip 4 facing the second pole piece material strip 3.

[0134] Specifically, the first glue coating mechanism 130 at the first diaphragm feeding mechanism 20 is suitable for spraying glue on the first diaphragm material strip 2, and the glue spraying position is the surface of the first diaphragm material strip 2 facing the second pole piece material strip 3, and the glue is only sprayed on the position compounded with the second pole piece material strip 3. No glue is sprayed on other positions of the first diaphragm material strip 2.

[0135] The first glue coating mechanism 130 at the second diaphragm feeding mechanism 40 is suitable for spraying glue on the second diaphragm material strip 4, and the glue spraying position is the surface of the second diaphragm material strip 4 facing the second pole piece material strip 3, and the glue is only sprayed on the position compounded with the second pole piece material strip 3. The other positions of the second diaphragm material strip 4 are not sprayed with glue.

[0136] Consistent with the above-mentioned second embodiment, the glue applied by the first glue coating mechanism 130 is configured to be sticky after heating. Therefore, when the glue-coated parts of the first diaphragm material strip 2 and the second diaphragm material strip 4 pass through the hot pressing roller 71 of the composite mechanism 70, the glue is heated and becomes sticky, so that the first diaphragm material strip 2 and the second diaphragm material strip 4 are attached to the fracture of the second pole piece material strip 3, forming the above-mentioned composite section 6.

[0137] In the third embodiment, it is also unnecessary to provide a preheating plate at the first diaphragm feeding mechanism 20 and the second diaphragm feeding mechanism 40 .

[0138] Embodiment 4

[0139] like Fig.11 As shown, the difference between the fourth embodiment of the battery cell winding device according to the present application and the above-mentioned three embodiments is that the battery cell winding device also includes a second gluing mechanism 140, and the second gluing mechanism 140 is arranged between the composite mechanism 70 and the winding station 101, and the second gluing mechanism 140 is suitable for spraying glue on the surface of the composite section 6 facing the winding head 82.

[0140] Specifically, after the composite is performed at the break of the second electrode sheet strip 3 and before being cut by the second cutting mechanism 90, the second glue coating mechanism 104 coats the composite section 6 with glue. The glue coating position is the surface of the composite section 6 facing the winding head 82 (i.e., the inner surface of the winding), and preferably the glue coating is performed at the tail position of the battery cell after the composite section 6 is cut.

[0141] Furthermore, the glue applied by the second glue coating mechanism 140 is configured to be sticky after heating, and the pressing roller at the finishing glue sticking station 102 is configured as a hot pressing roller. When the battery cell winding is finished, when the tail of the battery cell (that is, the location where the composite section 6 is glued) passes through the hot pressing roller, the glue is heated and sticky, so that the tail of the battery cell is directly attached to the outside of the battery cell, completing the finishing of the battery cell.

[0142] Therefore, in the fourth embodiment, it is not necessary to provide the second glue application mechanism 110 of the above embodiment.

[0143] It should be noted that the first diaphragm material strip 2, the second electrode material strip 3 and the second diaphragm material strip 4 in the fourth embodiment can be composited by preheating with a preheating plate and then thermally composited in the first embodiment, or by pre-spraying with glue and then thermally composited in the second or third embodiment.

[0144] The present application also provides a battery production line. According to an embodiment of the battery production line of the present application, the battery production line includes the above-mentioned battery cell winding device.

[0145] According to the above content, this patent application has the following advantages:

[0146] 1. During the winding process of the battery cell, the first diaphragm material strip, the second pole piece material strip and the second diaphragm material strip do not need to stop and wait, and continuous feeding of the three can be achieved, greatly improving the winding efficiency;

[0147] 2. After the second electrode sheet is cut and glued, the connecting tape covers the burrs. When the composite section is cut, only the connecting tape and two layers of diaphragms are cut, and no new burrs are generated. This is beneficial to improve the life of the cutter and eliminates the risk of burrs piercing the diaphragm and causing a short circuit in the battery cell.

[0148] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A battery cell winding device, characterized in that: include: frame; A first pole piece feeding mechanism (10), a first diaphragm feeding mechanism (20), a second pole piece feeding mechanism (30) and a second diaphragm feeding mechanism (40) are arranged in sequence, and are all arranged on the frame; A first cutting mechanism (50) and a first gluing mechanism (60) are arranged on the frame and located at the second pole piece feeding mechanism (30), the first cutting mechanism (50) being suitable for cutting the second pole piece material strip (3), the first gluing mechanism (60) being suitable for gluing the broken end of the second pole piece material strip (3) to form a connecting tape (5), the connecting tape (5) connecting the cut second pole piece material strips (3) before and after cutting; a composite mechanism (70), arranged on the frame and located downstream of the first pole piece feeding mechanism (10), the first diaphragm feeding mechanism (20), the second pole piece feeding mechanism (30) and the second diaphragm feeding mechanism (40), the composite mechanism (70) being suitable for composite the first diaphragm material strip (2), the connecting tape (5) and the second diaphragm material strip (4) to form a composite section (6); A winding mechanism (80) and a second cutting mechanism (90) are arranged on the frame and located downstream of the composite mechanism (70), the winding mechanism (80) being suitable for winding the first pole piece strip (1), the first diaphragm strip (2), the second pole piece strip (3) and the second diaphragm strip (4) to form a battery core, and the second cutting mechanism (90) being suitable for cutting off the portion between the second pole piece strip (3) before and after the composite section (6); The winding mechanism (80) comprises a rotating plate (81), a plurality of winding heads (82) being arranged on the rotating plate (81) along the circumferential direction, adsorption holes (821) being arranged on the outer circumferential surface of the winding head (82), the adsorption holes (821) being used to adsorb and fix the cut composite section (6) upstream onto the winding head (82).

2. The battery core winding device according to claim 1, characterized in that: The first cutting mechanism (50) is movably arranged upstream or downstream along the flow direction of the second pole piece strip (3).

3. The battery core winding device according to claim 1, characterized in that: The first glue sticking mechanism (60) comprises a first glue sticking plate (61) and a second glue sticking plate (62) which are arranged opposite to each other, and the first glue sticking plate (61) and the second glue sticking plate (62) are movably arranged upstream or downstream along the flow direction of the second pole piece strip (3).

4. The battery core winding device according to claim 1, characterized in that: The battery cell winding device further comprises a first clamping plate (121) and a second clamping plate (122), wherein the first clamping plate (121) and the second clamping plate (122) are both arranged on the frame and are capable of moving upstream or downstream along the flow direction of the second pole piece strip (3), wherein the first clamping plate (121) is located upstream of the first cutting mechanism (50) and the first gluing mechanism (60), and the second clamping plate (122) is located downstream of the first cutting mechanism (50) and the first gluing mechanism (60), wherein the first clamping plate (121) is suitable for clamping the upstream portion of the cut second pole piece strip (3), and the second clamping plate (122) is suitable for clamping the downstream portion of the cut second pole piece strip (3).

5. The battery core winding device according to any one of claims 1 to 4, characterized in that: The composite structure (70) comprises two heat-pressing rollers (71) arranged opposite to each other, and the heat-pressing rollers (71) are capable of moving towards or away from each other; or, the composite structure (70) comprises a heat-pressing roller (71) and a passing roller (72) arranged opposite to each other, and the passing roller (72) is fixedly arranged, and the heat-pressing roller (71) is capable of moving towards or away from the passing roller (72).

6. The battery core winding device according to any one of claims 1 to 4, characterized in that: The battery cell winding device further comprises a first glue coating mechanism (130), the first glue coating mechanism (130) being arranged at the second pole piece feeding mechanism (30) and being located downstream of the first cutting mechanism (50) and the first glue applying mechanism (60), the first glue coating mechanism (130) being suitable for spraying glue on both sides of the fracture of the second pole piece material strip (3).

7. The battery core winding device according to any one of claims 1 to 4, characterized in that: The battery cell winding device further comprises two groups of first glue coating mechanisms (130), wherein one group of the first glue coating mechanisms (130) is arranged at the first diaphragm feeding mechanism (20) and is suitable for spraying glue on the surface of the first diaphragm material strip (2) facing the second pole piece material strip (3), and the other group of the first glue coating mechanisms (130) is arranged at the second diaphragm feeding mechanism (40) and is suitable for spraying glue on the surface of the second diaphragm material strip (4) facing the second pole piece material strip (3).

8. The battery core winding device according to any one of claims 1 to 4, characterized in that: The frame is provided with a winding station (101) and a finishing gluing station (102); when the rotating plate (81) rotates, the winding head (82) can flow between the winding station (101) and the finishing gluing station (102); the winding head (82) is suitable for winding the first pole piece strip (1), the first diaphragm strip (2), the second pole piece strip (3) and the second diaphragm strip (4) to form a battery cell; the second cutting mechanism (90) is arranged at the winding station (101).

9. The battery core winding device according to claim 8, characterized in that: The adsorption holes (821) are multiple groups, and the multiple groups of adsorption holes (821) are arranged at intervals along the circumferential direction.

10. The battery core winding device according to claim 8, characterized in that: The second cutting mechanism (90) comprises a knife frame (91) and a roller cutter (92) arranged on the knife frame (91); the knife frame (91) is capable of moving towards or away from the winding head (82); and a first avoidance groove (822) suitable for cooperating with the roller cutter (92) is arranged on the outer peripheral surface of the winding head (82).

11. The battery core winding device according to claim 8, characterized in that: A second avoidance groove (823) suitable for cooperating with a blanking fixture is provided on the outer peripheral surface of the winding head (82).

12. The battery core winding device according to claim 8, characterized in that: The battery cell winding device further comprises a second gluing mechanism (110), wherein the second gluing mechanism (110) is arranged on the frame and located at the finishing gluing station (102).

13. The battery core winding device according to claim 8, characterized in that: The battery cell winding device further comprises a second glue coating mechanism (140), the second glue coating mechanism (140) being arranged between the composite mechanism (70) and the winding station (101), the second glue coating mechanism (140) being suitable for spraying glue on the surface of the composite section (6) facing the winding head (82).

14. A battery production line, characterized in that: It comprises a battery core winding device as claimed in any one of claims 1 to 13.

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