Lithium battery cutting and stacking all-in-one machine and production process thereof

Abstract

A lithium battery cutting and stacking all-in-one machine comprises a rack; the negative electrode unwinding and cutting unit comprises a negative electrode unwinding mechanism, a fly cutting mechanism, a diaphragm unwinding mechanism, a thermal compounding mechanism and a negative electrode cutting mechanism and is used for pressing an upper diaphragm, a negative electrode piece and a lower diaphragm to form a composite material, and the negative electrode cutting mechanism is used for cutting the composite material into a composite piece; the positive electrode unwinding and cutting unit is used for unwinding the positive electrode roll material and cutting the positive electrode roll material into a positive electrode plate; the pole piece conveying unit is used for conveying the positive pole piece and the composite piece into the next process for lamination; the lamination unit is used for alternately stacking the positive plates and the composite plates to form a battery cell; the hot-pressing unit is used for performing hot-pressing shaping on the battery cell; and the rubberizing unit is used for rubberizing the battery cell. According to the invention, unreeling, sheet preparation, sheet lamination, hot pressing and rubberizing can be integrated, and one-time complete slicing and stacking of the positive electrode, the negative electrode and the diaphragm can be realized, so that the production efficiency of the lithium battery is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of battery manufacturing, and in particular to a lithium battery cutting and stacking machine and a production process thereof. Background Art

[0002] Lithium batteries have the advantages of high voltage, high energy density, high safety, and low self-discharge rate. They are a promising new energy source. With the further development of science and technology, people's demand for lithium batteries is increasing. The working principle of laminated batteries is the same as that of lithium-ion batteries used in traditional electric vehicles. They are composed of positive electrodes, negative electrodes, separators, and electrolytes, and use the movement of lithium ions to generate electricity.

[0003] The traditional method of making laminated cells is to pass the electrode roll through a die-cutting machine to make electrode sheets, collect them in a material box, and then transfer them to the laminating machine through a material box conveyor line. After the material box is positioned, the electrode sheet loading robot grabs it to the laminating platform to make a cell, and then conveys it to the next process after gluing.

[0004] The current stacking equipment and process can only take single-pole sheets and then stack them. The equipment cycle is relatively slow and the production efficiency is low. In order to meet market demand and increase production capacity, multiple cutting and stacking machines are required to produce simultaneously. However, multiple cutting and stacking machines occupy a large area and have high equipment costs. Summary of the invention

[0005] The present invention applies for a lithium battery cutting and stacking machine and a production process thereof, and mainly solves the technical problem of how to improve the production efficiency of lithium batteries.

[0006] According to the first aspect, an embodiment provides a lithium battery cutting and stacking machine, comprising:

[0007] frame;

[0008] A negative electrode unwinding and cutting unit is arranged at the front end of the frame, and includes a negative electrode unwinding mechanism, a flying cutting mechanism, a diaphragm unwinding mechanism, a thermal compounding mechanism and a negative electrode cutting mechanism; the negative electrode unwinding mechanism unwinds the negative electrode coil, the flying cutting mechanism cuts the negative electrode coil into negative electrode sheets, the diaphragm unwinding mechanism is provided with two groups and unwinds the diaphragm at the upper and lower positions of the negative electrode sheet, the thermal compounding mechanism presses the upper diaphragm, the negative electrode sheet and the lower diaphragm to form a composite material, and the negative electrode cutting mechanism is used to cut the composite material into composite sheets;

[0009] A positive electrode unwinding and cutting unit is arranged at the front end of the frame, and the positive electrode unwinding and cutting unit unwinds the positive electrode coil and cuts the positive electrode coil into positive electrode sheets;

[0010] The electrode sheet conveying unit is distributed along the feeding direction and is used to convey the positive electrode sheet and the composite sheet to the next process for lamination;

[0011] A lamination unit, used for alternately laminating the positive electrode sheets and the composite sheets to form a battery core;

[0012] A hot pressing unit, used for hot pressing and shaping the battery core; and

[0013] The gluing unit is used for gluing the battery cell.

[0014] In another embodiment, the negative electrode unwinding and cutting unit is provided with two unwinding lines, and the negative electrode unwinding mechanism and the flying cutting mechanism are provided with two groups, and the two groups of the flying cutting mechanisms alternately feed the negative electrode sheets into the negative electrode cutting mechanism.

[0015] In another embodiment, the flying cutting mechanism includes an upper frame, a lower frame, a tracking assembly connecting the upper frame and the lower frame, a power assembly installed on the upper frame, and a feeding assembly, a cutter assembly and a clamping assembly installed on the lower frame in sequence along the feeding direction; the feeding assembly is used to pull the composite material belt along the feeding direction to the cutting position of the cutter assembly; the clamping assembly is used to clamp and position the composite material; the power assembly is used to drive the cutter assembly to reciprocate in the vertical direction; the cutter assembly is used to cut materials in the vertical direction; the tracking assembly is used to drive the lower frame to move forward in the feeding direction and feed the composite material that has been cut into the thermal bonding mechanism.

[0016] In another embodiment, the diaphragm unwinding mechanism includes a negative electrode substrate and a diaphragm unwinding assembly and a flattening assembly arranged on the negative electrode substrate, the flattening assembly includes an arc-shaped mandrel and a flattening roller sleeved on the arc-shaped mandrel, the arc-shaped mandrel is fixed to the negative electrode substrate and is circumferentially arranged in an arc shape, the flattening roller is rotatable relative to the arc-shaped mandrel, and the flattening roller is arranged on the feeding path of the diaphragm coil.

[0017] In another embodiment, the stacking unit includes a deviation correction mechanism, a stacking mechanism and a pole sheet transporting mechanism, the deviation correction mechanism is used to adjust the pole sheet to a set position, the pole sheet transporting mechanism is used to transfer the positive pole sheet and the composite pole sheet between the pole sheet conveying unit, the deviation correction mechanism and the stacking mechanism, and the stacking mechanism is used to stack the positive pole sheet and the negative pole sheet in sequence to form a battery cell.

[0018] In another embodiment, the electrode sheet transporting mechanism includes a transport bracket and a primary transport robot and a secondary transport robot installed on the transport bracket, wherein the primary transport robot transports the electrode sheet from the electrode sheet conveying unit to the correction mechanism for correction; and the secondary transport robot transports the electrode sheet after correction from the correction mechanism to the stacking mechanism for stacking.

[0019] In another embodiment, the correcting mechanism includes an equipment frame and multiple groups of supporting components, detection components and correcting components arranged on the equipment frame; the pole piece transporting mechanism obtains the pole piece to the supporting mechanism, multiple groups of the supporting mechanisms are arranged side by side and used to adsorb materials, and the number of the supporting mechanisms is not less than the number of the transporting mechanisms; the detection mechanism is used to detect the position deviation value of the material, the correcting mechanism is connected to the supporting mechanism one by one, and the correcting mechanism is used to adjust the position of the supporting component.

[0020] In another embodiment, the pole piece conveying unit adopts belt transmission, including independently arranged detection belt segment, rejection belt segment and cache belt segment, the detection belt segment is provided with size detection mechanism and defect detection mechanism, the size detection mechanism is used to detect the pole piece size and V-angle size and perform feedback correction, the defect detection mechanism is used to detect whether the pole piece surface coating has defects, the rejection belt segment is used to reject pole pieces with NG size and defects, and transmit the patch to the lamination unit; the cache belt segment passes through the lamination unit and the hot pressing unit, and cache platforms are provided at both ends of the cache belt segment.

[0021] According to the second aspect, an embodiment provides a lithium battery cutting and stacking production process, using the above-mentioned lithium battery cutting and stacking integrated machine, including the following steps:

[0022] The positive electrode is unwound and cut to form a positive electrode sheet, and the negative electrode and separator are unwound and cut to form a composite sheet with upper and lower separators;

[0023] The positive electrode sheet and the composite sheet are transported to the lamination unit through the corresponding electrode sheet transport units respectively;

[0024] The electrode conveying unit transports the positive electrode and composite sheet to the lamination unit for deviation correction and completes alternating lamination to form a battery cell;

[0025] The battery cells are cut and shaped by hot pressing in the hot pressing unit;

[0026] The battery cells are unloaded to the gluing unit to complete the gluing action;

[0027] The battery cells are unloaded to the designated logistics line.

[0028] In another embodiment, the negative electrode and the separator are unwound and cut to form a composite sheet with upper and lower separators, comprising:

[0029] The negative electrode unwinding mechanism unwinds the negative electrode coil and corrects the deviation during the unwinding process;

[0030] Coil appearance inspection;

[0031] The negative electrode coil is cut into negative electrode sheets by a flying cutting mechanism;

[0032] Two sets of diaphragm unwinding mechanisms unwind the diaphragm coil and correct the deviation during the unwinding process;

[0033] The negative electrode sheet is compounded between two groups of diaphragm coils through a thermal compounding mechanism to form a composite material and seal the edges;

[0034] The composite material is cut into composite sheets by the negative electrode cutting mechanism.

[0035] According to the lithium battery cutting and stacking machine and its process in the above-mentioned embodiment, it can integrate unwinding, sheet making, lamination, hot pressing and gluing into one, including all the processes of lithium battery lamination, so as to realize one-time complete slicing and stacking of positive electrode, negative electrode and diaphragm. There is no reciprocating motion of the stacking table during the production process of the composite lamination. The negative electrode sheet and the two layers of diaphragm have been compounded into a composite sheet by a thermal compound mechanism before entering the lamination unit, and there is no diaphragm tail roll after the lamination is completed, thus avoiding the problems of internal diaphragm wrinkles and diaphragm wrinkles at the tail roll during the lamination process. The equipment can be fully automatically controlled throughout the whole process, with high speed and high production capacity conversion, which can effectively improve the equipment timing and reduce the manufacturing cost of the equipment. The process actions of the mechanism are effectively merged, and the space utilization rate is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of the overall structure of the lithium battery cutting and stacking machine;

[0037] Figure 2 This is a schematic diagram of the overall action flow of the lithium battery cutting and stacking machine;

[0038] Figure 3 A schematic diagram of the overall structure of a frame in one embodiment;

[0039] Figure 4 A schematic diagram of the structure of a negative electrode unwinding unit in an embodiment;

[0040] Figure 5 A schematic diagram of the negative electrode belt in an embodiment;

[0041] Figure 6 A schematic diagram of the structure of a fly-cutting mechanism in an embodiment;

[0042] Figure 7 A schematic diagram of a diaphragm tape transport in an embodiment;

[0043] Figure 8 A schematic diagram of the structure of a flattening component in an embodiment;

[0044] Fig. 9 A schematic diagram of a flattening component in an embodiment;

[0045] Fig.10 A schematic diagram of the structure of a thermal composite mechanism in an embodiment;

[0046] Fig.11 A schematic diagram of the structure of a positive electrode unwinding unit in an embodiment;

[0047] Fig.12 A schematic diagram of the positive electrode belt in an embodiment;

[0048] Fig.13 A schematic diagram of the structure of the positive and negative electrode cutting mechanism in an embodiment;

[0049] Fig.14 A schematic diagram of the structure of a pole piece conveying unit in an embodiment;

[0050] Fig.15 A schematic diagram of the structure of a lamination unit in an embodiment;

[0051] Fig.16 A schematic diagram of the structure of a pole piece transport mechanism in an embodiment;

[0052] Fig.17 A schematic diagram of the structure of a deviation correction mechanism in an embodiment;

[0053] Fig.18 A schematic diagram of the structure of a hot pressing unit in an embodiment;

[0054] Fig.19 A schematic diagram of the structure of a hot pressing mechanism in an embodiment;

[0055] Fig. 20 A schematic diagram of the structure of a hot pressing device in an embodiment;

[0056] Fig.21 This is a schematic diagram of the structure of a hot pressing loading and unloading manipulator in an embodiment;

[0057] Fig. 22 This is a structural schematic diagram of a glue sticking unit in an embodiment;

[0058] Fig.23 This is a structural schematic diagram of a glue sticking mechanism in an embodiment;

[0059] Fig.24 A schematic diagram of the structure of a transfer robot in an embodiment;

[0060] Fig.25 A schematic diagram of the structure of a material unloading robot in an embodiment;

[0061] Fig.26 This is the process flow chart of the lithium battery cutting and stacking machine.

[0062] Reference numerals:

[0063] 1. Frame; 2. Negative electrode unwinding and cutting unit; 21. Negative electrode unwinding mechanism; 211. Negative electrode substrate; 212. Unwinding module; 213. Correction system; 214. Tension control system; 215. Tab detection module; 22. Flying cutting mechanism; 221. Upper frame; 222. Lower frame; 223. Position tracking component; 224. Power component; 225. Feeding component; 226. Cutter component; 227. Clamping component; 23. Diaphragm unwinding mechanism; 231. Diaphragm unwinding Component; 232, flattening component; 2321, arc mandrel; 2322, flattening roller; 24, thermal composite mechanism; 241, thermal composite component; 242, camera detection module; 243, edge sealing component; 25, negative electrode cutting mechanism; 251, feeding component; 252, hot cutting component; 3, positive electrode unwinding and cutting unit; 31, positive electrode unwinding mechanism; 311, positive electrode substrate; 312, unwinding module; 313, deviation correction system; 314, tension control system; 32, positive electrode Pole cutting mechanism; 4, pole piece conveying unit; 41, detection belt section; 42, rejection belt section; 43, cache belt section; 44, size detection mechanism; 45, defect detection mechanism; 5, lamination unit; 51, deviation correction mechanism; 511, equipment frame; 512, bearing assembly; 5121, bearing plate; 513, detection assembly; 514, deviation correction assembly; 52, lamination mechanism; 53, pole piece handling mechanism; 531, handling bracket; 532, first-level handling manipulator; 5 33. Secondary handling robot; 6. Hot pressing unit; 61. Hot pressing loading robot; 62. Hot pressing mechanism; 621. Hot pressing bracket; 622. Hot pressing device; 6221. Upper pressing plate; 6222. Lower pressing plate; 6223. Teflon; 6224. Anti-sticking mechanism; 63. Hot pressing unloading robot; 7. Gluing unit; 71. Transfer platform; 72. Transfer robot; 73. Unloading robot; 74. Gluing mechanism; 75. QR code sticking mechanism; 76. NG pull tape. DETAILED DESCRIPTION

[0064] The present invention is further described in detail below by specific embodiments in conjunction with the accompanying drawings. Wherein similar elements in different embodiments adopt associated similar element numbers. In the following embodiments, many detailed descriptions are for making the present application better understood. However, those skilled in the art can easily recognize that some features can be omitted in different situations, or can be replaced by other elements, materials, methods. In some cases, some operations related to the present application are not shown or described in the specification, this is to avoid the core part of the present application being overwhelmed by too much description, and for those skilled in the art, it is not necessary to describe these related operations in detail, and they can fully understand the related operations according to the description in the specification and the general technical knowledge in the art.

[0065] In addition, the features, operations or characteristics described in the specification can be combined in any appropriate manner to form various implementations. At the same time, the steps or actions in the method description can also be interchanged or adjusted in a manner that is obvious to those skilled in the art. Therefore, the various sequences in the specification and the drawings are only for the purpose of clearly describing a certain embodiment and are not meant to be a required sequence, unless otherwise specified that a certain sequence must be followed.

[0066] The serial numbers of the components in this document, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings).

[0067] The traditional method of making stacked cells is to pass the electrode rolls through a die-cutting machine to make electrode sheets, collect them in a material box, and then transfer them to the stacking machine through a material box conveyor line. After the material box is positioned, the electrode sheet loading robot grabs it to the stacking platform to make a cell, and then conveys it to the next process after gluing. However, the current stacking equipment and process can only take a single electrode sheet and then stack it. The equipment cycle is relatively slow and the production efficiency is low. In order to meet market demand and increase production capacity, multiple cutting and stacking machines are required to produce at the same time. However, multiple cutting and stacking machines occupy a large area and have high equipment costs.

[0068] In an embodiment of the present invention, a lithium battery cutting and stacking machine and its production process are disclosed, which can integrate unwinding, sheet making, lamination, hot pressing and gluing into one, including all the processes of lithium battery lamination, and realize one-time complete slicing and stacking of positive electrodes, negative electrodes and separators. A thermal composite technology route is adopted to realize one-time complete slicing and stacking of positive electrodes, negative electrodes and separators, so as to improve the production efficiency of lithium batteries.

[0069] According to the first aspect, an embodiment provides a lithium battery cutting and stacking machine, please refer to Figure 1 and Figure 2, including: a frame 1, used to support and install each unit of the cutting and stacking machine; a negative electrode unwinding and cutting unit 2, arranged at the front end of the frame 1, including a negative electrode unwinding mechanism 21, a flying cutting mechanism 22, a diaphragm unwinding mechanism 23, a thermal composite mechanism 24 and a negative electrode cutting mechanism 25; the negative electrode unwinding mechanism 21 unwinds the negative electrode coil, the flying cutting mechanism 22 cuts the negative electrode coil into negative electrode sheets, the diaphragm unwinding mechanism 23 is provided with two groups and unwinds the diaphragm at the upper and lower positions of the negative electrode sheet, and the thermal composite mechanism 24 presses the upper diaphragm, the negative electrode sheet and the lower diaphragm into a The composite material is formed, and the negative electrode cutting mechanism 25 is used to cut the composite material into composite sheets; the positive electrode unwinding and cutting unit 3 is arranged at the front end of the frame 1, and the positive electrode unwinding and cutting unit 3 unwinds the positive electrode coil and cuts the positive electrode coil into positive electrode sheets; the electrode sheet conveying unit 4 is distributed along the feeding direction, and is used to feed the positive electrode sheets and composite sheets to the next process for lamination; the lamination unit 5 is used to alternately stack the positive electrode sheets and composite sheets to form a battery cell; the hot pressing unit 6 is used to hot press and shape the battery cell; and the glue sticking unit 7 is used to glue the battery cell.

[0070] The lithium battery cutting and stacking machine disclosed in this embodiment has a negative electrode unwinding and cutting unit 2 and a positive electrode unwinding unit for unwinding, and the negative electrode sheet and the two layers of the diaphragm are compounded into a composite sheet by a thermal compound mechanism 24 before entering the lamination unit 5, and then the sheets are laminated and glued to complete the production of the battery; the present application can integrate unwinding, sheet making, lamination, hot pressing and glue sticking into one, including all the processes of lithium battery lamination, so as to realize the one-time complete slicing and stacking of the positive electrode, the negative electrode and the diaphragm, and there is no diaphragm tail roll after the lamination is completed, thereby avoiding the internal wrinkles of the diaphragm during the lamination process and the wrinkles of the diaphragm at the tail roll.

[0071] In this embodiment, the entire device also includes a control system, which is electrically connected to and controls each unit, so that the entire process of the lithium battery cutting and stacking machine can be fully automatically controlled, with high speed and high production capacity conversion. It can effectively improve the equipment timing and reduce the manufacturing cost of the equipment. The process actions of the mechanism are effectively merged, and the space utilization rate is high.

[0072] For further information, please refer to Figure 1 and Figure 2 The positive electrode unwinding unit and the negative electrode unwinding unit are both arranged at the front end of the frame 1 and are arranged separately and side by side. The negative electrode unwinding and cutting unit 2 is provided with two unwinding lines, that is, two groups of negative electrode unwinding mechanisms 21 and flying cutting mechanisms 22 are provided. The two groups of flying cutting mechanisms 22 alternately feed the negative electrode sheets into the negative electrode cutting mechanism 25.

[0073] Please refer to Figure 4 and Figure 5 The negative electrode unwinding mechanism 21 includes a negative electrode substrate 211, an unwinding module 212, a deviation correction system 213, a tension control system 214 and a tab detection module 215 arranged on the frame 1. For details, please refer to Figure 5, is a schematic diagram of negative electrode tape feeding, the negative electrode unwinding mechanism 21 unwinds the material from the unwinding roller at the front end, passes through the unwinding correction roller for unwinding correction, passes through the process correction roller for process correction, the coil passes through the tension swing roller and the tension roller to control the coil tension, and the coil passes through the tab detection module 215 during the tape feeding process to detect the front tab and the back tab of the negative electrode coil respectively; the two unwinding lines are finally sent to two sets of flying cutting mechanisms 22 for cutting.

[0074] Please refer to Figure 4 and Figure 6 In this application, two groups of flying cutting mechanisms 22 feed materials alternately to the hot compounding mechanism 24, adopting the "chasing cutting and chasing feeding" of the flying cutting components, the negative electrode "double-knife cutting", electromagnetic heating compound technology and fully automatic multi-station design, which greatly improves the stacking efficiency.

[0075] For details, please refer to Figure 4 and Figure 6 The flying cutting mechanism 22 includes an upper frame 221, a lower frame 222, a tracking component 223 connecting the upper frame 221 and the lower frame 222, a power component 224 installed on the upper frame 221, and a feeding component 251, a cutter component 226 and a clamping component 227 installed on the lower frame 222 in sequence along the feeding direction; the feeding component 251 is used to pull the composite material belt along the feeding direction to the cutting position of the cutter component 226; the clamping component 227 is used to clamp and position the composite material; the power component 224 is used to drive the cutter component 226 to reciprocate in the vertical direction; the cutter component 226 is used to cut materials in the vertical direction; the tracking component 223 is used to drive the lower frame 222 to move forward along the feeding direction and feed the composite sheet that has been cut into the hot compounding mechanism 24.

[0076] In the present application, the negative electrode coil is fed by the feeding assembly 251 until the negative electrode coil reaches the cutting position below the cutter assembly 226, and the negative electrode coil is clamped and positioned by the clamping assembly 227 at the rear end of the mechanism. The cutter assembly 226 provides descending power through the power assembly 224 to descend and cut the negative electrode coil into a single-piece composite sheet. Then the tracking assembly 223 drives the clamping assembly 227 to move forward along the feeding direction and send the electrode sheet that has been cut to the next process. At the same time, when the tracking assembly 223 retracts, the feeding assembly 251 continues to feed to prevent the material belt from retreating. The present application effectively combines the slicing, feeding, and clamping structures of the flying cutting mechanism 22, saves design costs and mechanism space, and makes the structure more reasonable and centralized, reducing the cost increased by additional structures.

[0077] Please refer to Figure 4 and Figure 6The tracking component 223 includes a linear module and a feeding part. The linear module is arranged along the feeding direction, and the linear track of the linear module is installed at the lower end of the upper frame 221; the lower frame 222 is arranged as a square frame structure, and the upper end of the lower frame 222 is connected to the sliding block of the linear module, so that the lower frame 222 can be moved along the feeding direction through the linear module. The sliding block of the linear module drives the lower frame 222 to move forward along the feeding direction as a whole, that is, drives the clamping component 227, the cutter component 226 and the feeding component 251 to send the electrode piece that has been cut to the next process for thermal compounding.

[0078] In this embodiment, the clamping assembly 227, the cutter assembly 226 and the feeding assembly 251 can adopt the solutions in the prior art to clamp, cut and feed the materials, which will not be described in detail here.

[0079] For further information, please refer to Figure 4 and Figure 7 , Figure 7 It is a schematic diagram of two groups of diaphragm belts above and below the negative electrode unwinding mechanism. The diaphragm unwinding mechanism 23 also includes a tension control system 314 and a correction system 213. The correction is an overall correction of a large plate; the diaphragm unwinding mechanism 23 includes a diaphragm unwinding component 231 and a flattening component 232 arranged on the negative electrode substrate 211. The diaphragm unwinding component 231 is also unwound by the unwinding roller at the front end, and the tension is detected in the middle, and the tension is controlled by the corresponding tension swing roller; the flattening component 232 is arranged on the side of the diaphragm belt close to the composite unit, and is used to flatten the diaphragm.

[0080] For details, please refer to Figure 8 and Fig. 9 The flattening component 232 includes an arc-shaped core shaft 2321 and a flattening roller 2322 sleeved on the arc-shaped core shaft 2321. The arc-shaped core shaft 2321 is fixed to the negative electrode substrate 211 and is arranged in an arc shape along the circumferential direction, and the flattening roller 2322 is arranged in an arc shape correspondingly. The flattening roller 2322 is rotatable relative to the arc-shaped core shaft 2321, and the flattening roller 2322 is arranged on the feeding path of the diaphragm coil; the flattening roller 2322 in this embodiment is arranged as a rubber roller. When the flattening component 232 is running, the arc-shaped core shaft 2321 does not rotate, but the flattening roller 2322 on the surface rotates. When the diaphragm passes through the arc high wrap angle point of the flattening roller 2322, a lateral speed (i.e., lateral force) is generated, and this speed (force) plays a flattening role.

[0081] In this embodiment, the designs of the negative electrode discharge mechanism and the positive electrode discharge mechanism are compatible, and real-time monitoring and display are performed. An alarm is given for abnormal tension, and the tension can be set.

[0082] For further information, please refer to Fig.10The thermal composite mechanism 24 includes a thermal composite component 241, a camera detection module 242 and an edge sealing component 243 which are arranged in sequence. A thermal composite feeding roller is arranged at the entrance of the thermal composite component 241. The negative electrode sheet and the upper and lower diaphragms enter the thermal composite component 241 from the feeding roller, and are hot-pressed and composited by the composite roller corresponding to the thermal composite component 241 to form a composite material. The camera detection module 242 uses a CCD industrial camera to photograph and detect the distance between adjacent electrode sheets and the front and back NS, confirm the edge sealing position accuracy, and provide immediate feedback; the composite material after detection enters the edge sealing component 243, and is edge sealed by the edge sealing roller of the edge sealing component 243, and the pressure of the cylinders at both ends of the composite roller and the edge sealing roller needs to be equal, and both are at the same speed as the feeding roller at the front end when running.

[0083] For further information, please refer to Fig.11 and Fig.12 , Fig.12 It is a schematic diagram of the positive electrode tape feeding, the positive electrode unwinding unit includes a positive electrode unwinding mechanism 31 and a positive electrode cutting mechanism 32. The positive electrode unwinding mechanism 31 is similar to the negative electrode unwinding mechanism 21, and also includes a positive electrode substrate 311, an unwinding module 312, a correction system 313 and a tension control system 314 arranged on the frame 1. The positive electrode unwinding mechanism 31 unwinds the material from the unwinding roller at the front end, and the unwinding correction is performed by the unwinding correction roller, and the process correction is performed by the process correction roller in the middle. The coil tension is controlled by the tension swing roller and the tension roller. Before the coil enters the positive electrode cutting mechanism 32, a buffer roller and a pressure roller are set for adjustment to ensure the flatness and tension of the coil entering the positive electrode cutting mechanism 32.

[0084] In this embodiment, please refer to Figure 4 and Fig.13 The positive electrode cutting mechanism 32 and the negative electrode cutting mechanism 25 are similar in structure, and the specific details can be designed according to on-site replacement. Specifically, they include a feeding component 251 and a hot cutting component 252. The feeding component 251 is used to support and drive the material to move along the feeding direction on the workbench; the hot cutting component 252 is arranged on the feeding path of the material along the feeding direction, including a hot cutting drive, a hot cutting frame 1 and a hot cutting knife arranged on the hot cutting frame 1, and the hot cutting knife is arranged perpendicular to the feeding direction. The hot cutting drive is connected to the hot cutting knife to drive the hot cutting knife to descend and cut the material; the feeding component 251 supports and drives the coil to move along the feeding direction until it passes through the hot cutting component 252 and reaches the hot cutting position, and the hot cutting drive drives the hot cutting knife to descend and cut the material. In this embodiment, two groups of hot cutting components 252 are provided, and a group of feeding components 251 are provided on both sides of any hot cutting component 252, that is, three groups of feeding components 251 are provided. The feeding components 251 can be used to compensate for the feeding length of the feeding components 251, and the specific design of each component can be designed according to the existing technical solution, which will not be repeated here.

[0085] Please refer to Figure 1 and Fig.14, the positive electrode cutting mechanism 32 and the negative electrode cutting mechanism 25 are both arranged on the electrode conveying unit 4, and the electrode conveying unit 4 will be used to transport single-piece positive electrode sheets and composite sheets. Specifically, the electrode conveying unit 4 adopts belt transmission, including an independently arranged detection belt segment 41, a rejection belt segment 42 and a buffer belt segment 43. The detection belt segment 41 is provided with a size detection mechanism 44 and a defect detection mechanism 45. The size detection mechanism 44 is used to detect the size of the electrode sheet and the V-angle size and to provide feedback correction. The defect detection mechanism 45 is used to detect whether the surface coating of the electrode sheet has defects. The rejection belt segment 42 is used to reject the electrode sheets with NG size and defects, and the patch is transmitted to the lamination unit 5; the cache belt segment 43 is provided with cache platforms at both ends, one end of the cache platform is used to place multiple electrode sheets for lamination loading, and the other cache platform is used for hot pressing and blanking to cache the battery cells.

[0086] Please refer to Fig.14 There are two groups of detection belt segments 41 and rejection belt segments 42, which correspond to the single-piece transportation and detection of positive and negative electrodes respectively. Among them, the detection belt segment 41 is used to transport the electrode sheet to the stacking unit 5, and the rejection belt segment 42 rejects NG electrode sheets and fills them during the transportation of the detection belt segment 41, and enters the stacking unit 5.

[0087] For further information, please refer to Figure 1 and Fig.15 The stacking unit 5 includes a correction mechanism 51, a stacking mechanism 52 and a pole piece conveying mechanism 53. The correction mechanism 51 is used to adjust the pole piece to a set position. The pole piece conveying mechanism 53 is used to transfer the positive pole piece and the composite pole piece between the pole piece conveying unit 4, the correction mechanism 51 and the stacking mechanism 52. The stacking mechanism 52 is used to stack the positive pole piece and the negative pole piece in sequence to form a battery cell.

[0088] Please refer to Fig.16 The electrode sheet transport mechanism 53 includes a transport bracket 531 and a primary transport robot 532 and a secondary transport robot 533 installed on the transport bracket 531. The primary transport robot 532 transports the electrode sheet from the electrode sheet conveying unit 4 to the deviation correction mechanism 51 for deviation correction; the secondary transport robot 533 transports the corrected electrode sheet from the deviation correction mechanism 51 to the stacking mechanism 52 for stacking. In this embodiment, two groups of the primary transport robot 532 and the secondary transport robot 533 are provided, which are used to transport the positive electrode sheet and the composite sheet respectively.

[0089] Please refer to Fig.17The correcting mechanism 51 includes an equipment frame 511 and multiple groups of supporting components 512, detection components 513 and correcting components 514 arranged on the equipment frame 511; the electrode transporting mechanism 53 obtains the electrode to the supporting mechanism, and multiple groups of supporting mechanisms are arranged side by side and used to adsorb materials, including a supporting plate 5121, the supporting plate 5121 is hollow to form a supporting cavity, and the supporting plate 5121 is provided with multiple suction holes connected to the supporting cavity, and the suction holes are used to adsorb materials; a light source is arranged on one side of the supporting plate 5121, and a detection mechanism is arranged on the side of the supporting plate 5121 away from the light source, and the detection mechanism is used to detect the position deviation value of the material, and the correcting mechanism 51 is connected to the supporting mechanism one by one, and the correcting mechanism 51 is used to adjust the position of the supporting component 512.

[0090] For details, please refer to Fig.17 There are 8 supporting plates 5121 which are evenly distributed side by side. The number and size of supporting plates 5121 can be set according to the site, and they are compatible with large-size pole piece correction.

[0091] Please refer to Fig.16 In this embodiment, the transport robot has multiple degrees of freedom. A transport plate is set at the front end of the transport robot. The transport plate is hollow to form a transport cavity. A plurality of suction nozzles connected to the transport cavity are set on the transport plate, and the suction nozzles are used to adsorb or press the electrode. When the transport plate is turned on, the negative pressure adsorbs the electrode on the electrode conveying unit 4 through the suction nozzle. The transport robot transports the electrode to the top of the supporting plate 5121, descends through the Z axis, and places the electrode on the supporting plate 5121 for deviation correction. After the deviation correction is completed, the electrode is transported to the stacking mechanism 52 for stacking by the same operation.

[0092] In this embodiment, the stacking mechanism 52 is provided with a stacking platform, a stacking platform lifting assembly, a stacking platform pressing knife assembly and a stacking platform translation assembly. After positioning, the pole pieces are stacked onto the stacking platform according to the set number. The pressing knife of the stacking platform pressing knife assembly completes the battery cell pressing function from both sides of the battery cell, and the positive pole pieces and the composite pole pieces complete the stacking action alternately in sequence. The specific scheme of the correction mechanism 51 and the stacking mechanism 52 can be designed using existing technology, and the specific details are not repeated. The positive pole piece or the composite pole piece is taken 8p / times from the pole piece conveying unit 4 by a handling robot and transported to the correction mechanism 51. The 8 groups of carrier plates 5121 are respectively photographed and positioned for correction, and then the positioned 8p materials are transported to the stacking mechanism 52 at one time by the secondary handling robot 533 to complete the stacking action.

[0093] For further information, please refer to Fig.18The hot pressing unit 6 includes a hot pressing loading robot 61, a hot pressing mechanism 62 and a hot pressing unloading robot 63. The hot pressing loading robot 61 has four grippers and is used to clamp the battery cells and turn them to the hot pressing cavity of the hot pressing mechanism 62. The hot pressing mechanism 62 hot presses the battery cells in the hot pressing cavity. The hot pressing unloading robot 63 has four grippers and is used to clamp the battery cells and leave the hot pressing cavity of the hot pressing mechanism 62.

[0094] Please refer to Fig.18 and Fig.19 The hot pressing mechanism 62 includes 4 groups of hot pressing brackets 621, and a hot pressing cavity is formed in the hot pressing brackets 621. Each hot pressing cavity is provided with 4 entrances and corresponding hot pressing devices 622. The hot pressing loading robot 61 simultaneously clamps 4 groups of battery cells and puts them into the corresponding hot pressing device 622 for hot pressing. After the hot pressing is completed, the 4 groups of battery cells are clamped by the hot pressing unloading robot 63 and put into the next process.

[0095] Please refer to Fig.19 , Fig. 20 and Fig.21 The hot pressing device 622 generally includes an upper pressing plate 6221 and a lower pressing plate 6222, and the battery cells are placed between the upper pressing plate 6221 and the lower pressing plate 6222. The Teflon 6223 is distributed close to the upper pressing plate 6221 and the lower pressing plate 6222. The Teflon 6223 corresponding to the upper pressing plate 6221 has an anti-sticking mechanism 6224, which is specifically configured as a roller. The roller presses the Teflon 6223 away from the battery cell placement position. When the loading and unloading robot 73 is loading and unloading, the anti-sticking mechanism 6224 needs to be avoided in advance to avoid interference with the robot gripper. Before the gripper enters, the roller presses the Teflon 6223 in advance to achieve active deformation.

[0096] In this embodiment, hot pressing and shaping of the battery cell can improve the flatness of the lithium-ion battery so that the battery cell thickness meets the requirements and has high consistency; eliminate diaphragm wrinkles, drive out the air inside the battery cell, make the diaphragm and the positive and negative electrode plates stick closely together, shorten the lithium ion diffusion distance, and reduce the internal resistance of the battery.

[0097] For further information, please refer to Fig. 22 , Fig.23 , Fig.24 and Fig.25The gluing unit 7 is used to apply side glue and QR code to the battery cells, and includes a transfer platform 71, a transfer robot 72, a battery cell unloading robot 73, a gluing mechanism 74, a QR code sticking mechanism 75 and an NG pull tape 76. The hot pressing battery cell unloading robot 73 clamps 4 groups of battery cells and places them on the transfer platform 71. The gluing mechanism 74 has a gluing platform and a gluing device. The transfer robot 72 takes the battery cells from the transfer platform 71 and places them on the gluing platform. After the gluing device completes gluing on one side, the platform rotates 180° to stick side glue on the other side of the battery cells; the battery cell unloading robot 73 grabs the battery cells that have completed side glue sticking to the QR code sticking mechanism 75 to stick a QR code. After gluing is completed, the NG battery cells are placed on the NG pull tape 76, and the OK battery cells are directly unloaded.

[0098] The lithium battery cutting and stacking machine of this embodiment adopts thermal composite technology to achieve one-time complete slicing and stacking of positive, negative and diaphragm, effectively improving the quality and production rate of the laminate and battery core; the stacking platform does not reciprocate during the production process of the composite laminate, the negative electrode sheet and the two layers of diaphragm have been heated and composited into a unit before entering the stacking platform, and there is no tail roll of the diaphragm after the lamination is completed, avoiding the internal wrinkles of the diaphragm and the wrinkles of the diaphragm at the tail roll during the lamination process. The diaphragm is carried at a uniform speed during the entire lamination process, avoiding the alternation of diaphragm tension, and the visual inspection of the thermal composite sheet is more accurate, close to zero misjudgment; and the composite process makes the positive and negative electrode sheets and diaphragms fit better, and the interface retention effect is better; during the reagent use process of the equipment, by adopting the composite unit die-cutting high-precision control technology, the pole piece tracking cutting and feeding high-precision synchronous control technology, and the high-precision pole piece positioning and correction detection technology to achieve the synchronization of more than 200 axes, 100 CCDs simultaneously visually inspect, and realize the online full inspection of diaphragm wrinkles.

[0099] According to the second aspect, please refer to Figure 1-Figure 26 In one embodiment, a lithium battery stacking production process is provided, using the above-mentioned lithium battery stacking machine, including the following steps:

[0100] The positive electrode is unwound and cut to form a positive electrode sheet, and the negative electrode and separator are unwound and cut to form a composite sheet with upper and lower separators;

[0101] Positive electrode unwinding:

[0102] The positive electrode unwinding mechanism 31 unwinds the positive electrode coil, and during the unwinding process, the deviation correction system 213 corrects the deviation, and the tension is adjusted by the tension control system 314;

[0103] The positive electrode coil is cut into positive electrode sheets by the positive electrode cutting mechanism 32;

[0104] The size detection mechanism 44 and the defect detection mechanism 45 are used to detect the size and appearance of the pole piece, and NG ones are rejected;

[0105] Negative electrode unwinding:

[0106] The negative electrode unwinding mechanism 21 unwinds the negative electrode coil, and during the unwinding process, the correction system 213 corrects the deviation, the tension is adjusted by the tension control system 314, and the negative electrode tab is detected by the tab detection module 215;

[0107] The negative electrode coil is cut into negative electrode sheets by the double fly-cutting mechanism 22 and fed alternately and continuously;

[0108] Two sets of diaphragm unwinding mechanisms 23 unwind the diaphragm coil and correct the deviation during the unwinding process;

[0109] The negative electrode sheet is compounded between two groups of diaphragm coils by a thermal compounding mechanism 24 to form a compound material and seal the edges;

[0110] The composite material is cut into composite sheets by the negative electrode cutting mechanism 25;

[0111] The size detection mechanism 44 and the defect detection mechanism 45 are used to detect the size of the pole piece and the appearance of the composite piece, and NG pieces are rejected;

[0112] The positive electrode sheet and the composite sheet are respectively transported to the lamination unit 5 through the corresponding electrode sheet transport unit 4;

[0113] The positive electrode sheets and the composite sheets are respectively corrected by the correcting mechanism 51, and the corrected positive electrode sheets and the composite sheets are alternately stacked by the stacking mechanism 52 to form a battery cell;

[0114] The hot pressing feeding robot 61 grabs the battery cell on the buffer platform and places it in the hot pressing unit 6 for testing and hot pressing shaping, and detects NG battery cells and does not hot press them;

[0115] The hot pressing unloading robot 63 unloads the battery cells to the transfer platform 71, the transfer robot 72 grabs the battery cells to complete the side glue sticking, the unloading robot 73 grabs the battery cells that have completed the glue sticking to stick the QR code, and detects the NG battery cells and flows them to the NG draw tape 76;

[0116] The battery cells are unloaded to the designated logistics line.

[0117] The above specific examples are used to illustrate the present invention, which are only used to help understand the present invention and are not used to limit the present invention. For those skilled in the art to which the present invention belongs, some simple deductions, modifications or substitutions can be made according to the idea of ​​the present invention.

Claims

1. A lithium battery cutting and stacking machine, characterized in that: include: Rack (1); A negative electrode unwinding and cutting unit (2) is arranged at the front end of the frame (1), and comprises a negative electrode unwinding mechanism (21), a flying cutting mechanism (22), a diaphragm unwinding mechanism (23), a thermal composite mechanism (24) and a negative electrode cutting mechanism (25); the negative electrode unwinding mechanism (21) unwinds the negative electrode coil, the flying cutting mechanism (22) cuts the negative electrode coil into negative electrode sheets, the diaphragm unwinding mechanism (23) is provided with two groups and unwinds the diaphragm at the upper and lower positions of the negative electrode sheet, the thermal composite mechanism (24) presses the upper diaphragm, the negative electrode sheet and the lower diaphragm to form a composite material, and the negative electrode cutting mechanism (25) is used to cut the composite material into composite sheets; A positive electrode unwinding and cutting unit (3) is arranged at the front end of the frame (1), and the positive electrode unwinding and cutting unit (3) unwinds the positive electrode coil and cuts the positive electrode coil into positive electrode sheets; The electrode sheet conveying unit (4) is distributed along the feeding direction and is used to convey the positive electrode sheet and the composite sheet to the next process for lamination; A stacking unit (5) is used to alternately stack the positive electrode sheets and the composite sheets to form a battery core; A hot pressing unit (6), used for hot pressing and shaping the battery core; as well as A gluing unit (7) is used for gluing the battery core.

2. The lithium battery cutting and stacking machine according to claim 1, characterized in that: The negative electrode unwinding and cutting unit (2) is provided with two unwinding lines, and the negative electrode unwinding mechanism (21) and the flying cutting mechanism (22) are provided with two groups, and the two groups of the flying cutting mechanism (22) alternately feed the negative electrode sheet into the negative electrode cutting mechanism (25).

3. The lithium battery cutting and stacking machine according to claim 2, characterized in that: The flying cutting mechanism (22) comprises an upper frame (221), a lower frame (222), a tracking assembly (223) connecting the upper frame (221) and the lower frame (222), a power assembly (224) installed on the upper frame (221), and a feeding assembly (251), a cutter assembly (226) and a clamping assembly (227) installed on the lower frame (222) in sequence along the feeding direction; the feeding assembly (251) is used to pull the composite material strip along the feeding direction. The composite material is moved in the material direction to the cutting position of the cutter assembly (226); the clamping assembly (227) is used to clamp and position the composite material; the power assembly (224) is used to drive the cutter assembly (226) to reciprocate in the vertical direction; the cutter assembly (226) is used to cut the material in the vertical direction; the tracking assembly (223) is used to drive the lower frame (222) to move forward in the feeding direction and feed the composite sheet that has been cut into the thermal compounding mechanism (24).

4. The lithium battery cutting and stacking machine according to claim 1, characterized in that: The diaphragm unwinding mechanism (23) comprises a negative electrode substrate (211) and a diaphragm unwinding component (231) and a flattening component (232) arranged on the negative electrode substrate (211); the flattening component (232) comprises an arc-shaped core shaft (2321) and a flattening roller (2322) sleeved on the arc-shaped core shaft (2321); the arc-shaped core shaft (2321) is fixed to the negative electrode substrate (211) and is arranged in an arc shape along the circumferential direction; the flattening roller (2322) is rotatable relative to the arc-shaped core shaft (2321); and the flattening roller (2322) is arranged on the feeding path of the diaphragm coil.

5. The lithium battery cutting and stacking machine according to claim 1, characterized in that: The laminating unit (5) comprises a deviation correction mechanism (51), a laminating mechanism (52) and an electrode sheet conveying mechanism (53); the deviation correction mechanism (51) is used to adjust the electrode sheet to a set position; the electrode sheet conveying mechanism (53) is used to transfer the positive electrode sheet and the composite sheet between the electrode sheet conveying unit (4), the deviation correction mechanism (51) and the laminating mechanism (52); and the laminating mechanism (52) is used to stack the positive electrode sheet and the negative electrode sheet in sequence to form a battery cell.

6. The lithium battery cutting and stacking machine according to claim 5, characterized in that: The electrode sheet transport mechanism (53) comprises a transport bracket (531) and a primary transport robot (532) and a secondary transport robot (533) mounted on the transport bracket (531); the primary transport robot (532) transports the electrode sheet from the electrode sheet conveying unit (4) to the deviation correction mechanism (51) for deviation correction; and the secondary transport robot (533) transports the electrode sheet after deviation correction from the deviation correction mechanism (51) to the stacking mechanism (52) for stacking.

7. The lithium battery cutting and stacking machine according to claim 5, characterized in that: The deflection correction mechanism (51) comprises an equipment frame (511) and a plurality of groups of bearing components (512), detection components (513) and deflection correction components (514) arranged on the equipment frame (511); the electrode piece conveying mechanism (53) obtains the electrode piece onto the bearing mechanism, a plurality of groups of the bearing mechanisms are arranged side by side and used to absorb materials, and the number of the bearing mechanisms is not less than the number of the conveying mechanisms; the detection mechanism is used to detect the position deviation value of the material, the deflection correction mechanism (51) is connected to the bearing mechanism in a one-to-one correspondence, and the deflection correction mechanism (51) is used to adjust the position of the bearing component (512).

8. The lithium battery cutting and stacking machine according to claim 1, characterized in that: The electrode conveying unit (4) adopts belt transmission, and comprises independently arranged detection belt segments (41), rejection belt segments (42) and buffer belt segments (43); the detection belt segment (41) is provided with a size detection mechanism (44) and a defect detection mechanism (45); the size detection mechanism (44) is used to detect the size of the electrode and the V-angle size and to perform feedback correction; the defect detection mechanism (45) is used to detect whether the surface coating of the electrode has defects; the rejection belt segment (42) is used to reject the electrode with NG size and defects, and to transfer the patch to the lamination unit (5); the buffer belt segment (43) passes through the lamination unit (5) and the hot pressing unit (6); buffer platforms are provided at both ends of the buffer belt segment (43).

9. A lithium battery production process, using the lithium battery cutting and stacking machine as claimed in any one of claims 1 to 8, characterized in that: Including the following processes: The positive electrode is unwound and cut to form a positive electrode sheet, and the negative electrode and separator are unwound and cut to form a composite sheet with upper and lower separators; The positive electrode sheet and the composite sheet are respectively transported to the lamination unit (5) through the corresponding electrode sheet transport units (4); The electrode sheet conveying unit (4) transports the positive electrode sheet and the composite sheet to the stacking unit (5) for deviation correction and completes alternate stacking to form a battery cell; The battery cells are cut and shaped by hot pressing in a hot pressing unit (6); The battery cells are unloaded to the gluing unit (7) to complete the gluing operation; The battery cells are unloaded to the designated logistics line.

10. The lithium battery production process according to claim 9, characterized in that: The negative electrode and the separator are unwound and cut to form a composite sheet with upper and lower separators, comprising: The negative electrode unwinding mechanism (21) unwinds the negative electrode coil and corrects the deviation during the unwinding process; Coil appearance inspection; The negative electrode coil is cut by a flying cutting mechanism (22) to form negative electrode sheets; Two sets of diaphragm unwinding mechanisms (23) are used to unwind the diaphragm coils and perform deviation correction during the unwinding process; The negative electrode sheet is compounded between two groups of diaphragm coils through a thermal compounding mechanism (24) to form a compound material and seal the edges; The composite material is cut into composite sheets by a negative electrode cutting mechanism (25).

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