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

Abstract

A lithium battery cutting and stacking all-in-one machine comprises a rack, a negative electrode unwinding and cutting unit, a positive electrode unwinding and cutting unit, a pole piece conveying unit, a stacking unit, a hot pressing unit and a rubberizing unit. 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, which are used to press and hold the upper diaphragm, the negative electrode sheet and the lower diaphragm to form a compound material, and the negative electrode cutting mechanism is used to cut the compound material into a compound sheet. The positive electrode unwinding and cutting unit unwinds and cuts the positive electrode roll material into a positive electrode sheet. The pole piece conveying unit is used to send the positive electrode sheet and the compound sheet to the next process for stacking. The stacking unit is used to alternately stack the positive electrode sheet and the compound sheet to form a battery cell. The hot pressing unit is used to hot press and shape the battery cell. The rubberizing unit is used to rubberize the battery cell. The application integrates unwinding, sheet making, stacking, hot pressing and rubberizing into one, realizes one-time complete cutting and stacking of the positive electrode, the negative electrode and the diaphragm, and improves the production efficiency of the lithium battery.

Description

Technical Field

[0001] This invention relates to the field of battery manufacturing technology, specifically to a lithium battery cutting and stacking integrated machine and its production process. Background Technology

[0002] Lithium-ion batteries possess advantages such as high voltage, high energy density, high safety, and low self-discharge rate, making them a promising new energy source. With further advancements in science and technology, the demand for lithium-ion batteries is increasing. Stacked-cell batteries operate on the same principle as traditional lithium-ion batteries used in electric vehicles, consisting of a positive electrode, a negative electrode, a separator, and an electrolyte, generating electricity through the movement of lithium ions.

[0003] The traditional method for manufacturing laminated battery cells is as follows: electrode rolls are passed through a die-cutting machine to form electrode sheets, which are then collected into a material box and transferred to a laminating machine via a material box conveyor line. After the material box is positioned, the electrode sheets are picked up by an electrode sheet loading robot and placed onto the laminating platform to form battery cells. After being glued, the cells are conveyed to the next process.

[0004] Current wafer stacking equipment and processes can only take single-electrode wafers and then stack them. The equipment cycle time is relatively slow and the production efficiency is low. In order to meet market demand and increase production capacity, multiple cutting and stacking machines need to be used at the same time. However, multiple cutting and stacking machines occupy a large area and have high equipment costs. Summary of the Invention

[0005] This invention applies for a lithium battery cutting and stacking integrated machine and its production process, and the main technical problem to be solved is how to improve the production efficiency of lithium batteries.

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

[0007] frame;

[0008] A negative electrode unwinding and cutting unit is located at the front end of the frame and includes a negative electrode unwinding mechanism, a flying cutter mechanism, a diaphragm unwinding mechanism, a thermal lamination mechanism, and a negative electrode cutting mechanism. The negative electrode unwinding mechanism unwinds the negative electrode roll material, the flying cutter mechanism cuts the negative electrode roll material into negative electrode sheets, the diaphragm unwinding mechanism has two sets of diaphragms that are respectively unwinded at the upper and lower positions of the negative electrode sheets, the thermal lamination 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 located at the front end of the frame. The positive electrode unwinding and cutting unit unwinds the positive electrode roll and cuts the positive electrode roll into positive electrode sheets.

[0010] The electrode conveying unit is distributed along the feeding direction and is used to feed the positive electrode and the composite sheet into the next process for stacking.

[0011] A stacking unit is used to alternately stack the positive electrode sheet and the composite sheet to form a battery cell;

[0012] A hot-pressing unit is used for hot-pressing and shaping the battery cell; and

[0013] An adhesive application unit is used to apply adhesive to 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 in two sets. The two sets of flying cutting mechanisms alternately feed the negative electrode sheet into the negative electrode cutting mechanism.

[0015] In another embodiment, the flying cutting mechanism includes an upper frame, a lower frame, a tracking component connecting the upper and lower frames, a power component mounted on the upper frame, and a feeding component, a cutting component, and a clamping component sequentially mounted on the lower frame along the feeding direction. The feeding component is used to pull the composite material belt along the feeding direction to the cutting position of the cutting component. The clamping component is used to clamp and position the composite material. The power component is used to drive the cutting component to reciprocate along the vertical direction. The cutting component is used to cut the material along the vertical direction. The tracking component is used to drive the lower frame to move forward along the feeding direction and feed the cut composite material into the thermal composite mechanism.

[0016] In another embodiment, the diaphragm unwinding mechanism includes a negative electrode substrate and a diaphragm unwinding assembly and a flattening assembly disposed 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 arc-shaped. The flattening roller is rotatable relative to the arc-shaped mandrel and is disposed on the feeding path of the diaphragm roll.

[0017] In another embodiment, the stacking unit includes a correction mechanism, a stacking mechanism, and an electrode transport mechanism. The correction mechanism is used to adjust the electrode to a set position. The electrode transport mechanism is used to transfer the positive electrode and the composite electrode between the electrode transport unit, the correction mechanism, and the stacking mechanism. The stacking mechanism is used to stack the positive electrode and the negative electrode sequentially to form a battery cell.

[0018] In another embodiment, the electrode transport mechanism includes a transport bracket and a primary transport robot and a secondary transport robot mounted on the transport bracket. The primary transport robot transports the electrode from the electrode conveying unit to the correction mechanism for correction. The secondary transport robot transports the corrected electrode from the correction mechanism to the stacking mechanism for stacking.

[0019] In another embodiment, the correction mechanism includes a device frame and multiple sets of support components, detection components, and correction components disposed on the device frame; the electrode transport mechanism picks up electrodes onto the support components, the multiple sets of support components are arranged side by side and used to adsorb materials, and the number of support components is not less than the number of transport mechanisms; the detection components are used to detect the positional deviation value of the materials, the correction mechanism is connected to the support components one by one, and the correction mechanism is used to adjust the position of the support components.

[0020] In another embodiment, the electrode conveying unit uses belt conveyor, including independently set detection belt section, rejection belt section, and buffer belt section. The detection belt section is equipped with a size detection mechanism and a defect detection mechanism. The size detection mechanism is used to detect the electrode size and V-angle size and perform feedback correction. The defect detection mechanism is used to detect whether there are defects in the coating on the electrode surface. The rejection belt section is used to reject electrodes with NG size and defects, and convey the replacement electrodes to the stacking unit. The buffer belt section passes through the stacking unit and the hot pressing unit, and buffer platforms are set at both ends of the buffer belt section.

[0021] According to the second aspect, one embodiment provides a lithium battery cutting and stacking production process, which uses the aforementioned integrated lithium battery cutting and stacking machine and includes 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 respectively transported to the stacking unit through the corresponding electrode sheet conveying unit;

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

[0025] The battery cells are hot-pressed and shaped in the hot-pressing unit.

[0026] The battery cell is fed into the adhesive bonding unit to complete the adhesive bonding process;

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

[0028] In another embodiment, the unwinding and cutting of the negative electrode and separator to form a composite sheet with upper and lower separators includes:

[0029] The negative electrode unwinding mechanism unwinds the negative electrode roll material and corrects deviations during the unwinding process;

[0030] Roll material appearance inspection;

[0031] The negative electrode roll is cut into negative electrode sheets by a flying cutter;

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

[0033] The negative electrode sheet is laminated between two sets of diaphragm rolls through a thermal lamination mechanism to form a composite material and then the edges are sealed.

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

[0035] The lithium battery cutting and stacking integrated machine and its process according to the above embodiments can integrate unwinding, sheet making, stacking, hot pressing, and adhesive application into one unit, including all processes of lithium battery stacking. It realizes one-time complete cutting and stacking of positive electrode, negative electrode and separator. During the production process, the stacking platform does not reciprocate. The negative electrode sheet and two layers of separator are already combined into a composite sheet by the thermal composite mechanism before entering the stacking unit. After stacking, there is no separator tail roll, avoiding the problems of internal wrinkles of separator and separator wrinkles of tail roll during the stacking process. Moreover, the equipment can be fully automated and controlled throughout the process. It is fast and has high 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 combined, and the space utilization rate is high. Attached Figure Description

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

[0037] Figure 2 A schematic diagram of the overall operation process of a lithium battery cutting and stacking integrated machine;

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

[0039] Figure 4 This is a schematic diagram of the negative electrode unwinding unit in one embodiment;

[0040] Figure 5 This is a schematic diagram of the negative electrode routing in one embodiment;

[0041] Figure 6 This is a schematic diagram of the flying cutter mechanism in one embodiment;

[0042] Figure 7 This is a schematic diagram of the diaphragm transport in one embodiment;

[0043] Figure 8 This is a schematic diagram of the structure of the flattening component in one embodiment;

[0044] Figure 9 This is a schematic diagram illustrating the principle of the flattening component in one embodiment;

[0045] Figure 10 This is a schematic diagram of the thermal recombination mechanism in one embodiment;

[0046] Figure 11 This is a schematic diagram of the positive electrode unwinding unit in one embodiment;

[0047] Figure 12 This is a schematic diagram of the positive electrode band in one embodiment;

[0048] Figure 13 This is a schematic diagram of the positive and negative electrode cutting mechanism in one embodiment;

[0049] Figure 14 This is a schematic diagram of the structure of the electrode conveying unit in one embodiment;

[0050] Figure 15 This is a schematic diagram of the structure of a stacked unit in one embodiment;

[0051] Figure 16 This is a schematic diagram of the electrode transport mechanism in one embodiment;

[0052] Figure 17 This is a schematic diagram of the correction mechanism in one embodiment;

[0053] Figure 18 This is a schematic diagram of the structure of the hot-pressing unit in one embodiment;

[0054] Figure 19 This is a schematic diagram of the hot pressing mechanism in one embodiment;

[0055] Figure 20 This is a schematic diagram of the hot pressing device in one embodiment;

[0056] Figure 21 This is a schematic diagram of the structure of a hot-pressing loading and unloading robot in one embodiment;

[0057] Figure 22 This is a schematic diagram of the adhesive application unit in one embodiment;

[0058] Figure 23 This is a schematic diagram of the adhesive application mechanism in one embodiment;

[0059] Figure 24 This is a schematic diagram of the structure of a transfer robot in one embodiment;

[0060] Figure 25 This is a schematic diagram of the structure of a material unloading robot in one embodiment;

[0061] Figure 26 This is a process flow diagram of a lithium battery cutting and stacking integrated machine.

[0062] Figure label:

[0063] 1. Frame; 2. Negative electrode unwinding and cutting unit; 21. Negative electrode unwinding mechanism; 211. Negative electrode substrate; 212. Unwinding module; 213. Web correction system; 214. Tension control system; 215. Tab detection module; 22. Flying cutter mechanism; 221. Upper frame; 222. Lower frame; 223. Tracking assembly; 224. Power assembly; 225. Feeding assembly; 226. Cutting assembly; 227. Clamping assembly; 23. Diaphragm unwinding mechanism; 231. Diaphragm unwinding Components; 232, Flattening Component; 2321, Arc-shaped 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, Thermal Cutting Component; 3, Positive Electrode Unwinding and Cutting Unit; 31, Positive Electrode Unwinding Mechanism; 311, Positive Electrode Substrate; 312, Unwinding Module; 313, Web Correction System; 314, Tension Control System; 32, Positive 4. Electrode cutting mechanism; 4. Electrode conveying unit; 41. Inspection belt segment; 42. Rejection belt segment; 43. Buffer belt segment; 44. Dimension inspection mechanism; 45. Defect inspection mechanism; 5. Stacking unit; 51. Correction mechanism; 511. Equipment frame; 512. Bearing assembly; 5121. Bearing plate; 513. Inspection assembly; 514. Correction assembly; 52. Stacking mechanism; 53. Electrode handling mechanism; 531. Handling bracket; 532. Primary handling robot; 5 33. Secondary handling robot; 6. Hot pressing unit; 61. Hot pressing loading robot; 62. Hot pressing mechanism; 621. Hot pressing support; 622. Hot pressing device; 6221. Upper pressure plate; 6222. Lower pressure plate; 6223. Teflon; 6224. Anti-sticking mechanism; 63. Hot pressing unloading robot; 7. Adhesive application unit; 71. Transfer platform; 72. Transfer robot; 73. Unloading robot; 74. Adhesive application mechanism; 75. QR code application mechanism; 76. NG pull belt. Detailed Implementation

[0064] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings. Similar elements in different embodiments are referred to by associated similar element reference numerals. In the following embodiments, many details are described to facilitate a better understanding of this application. However, those skilled in the art will readily recognize that some features may be omitted in different situations, or may be replaced by other elements, materials, or methods. In some cases, certain operations related to this application are not shown or described in the specification. This is to avoid obscuring the core parts of this application with excessive description. For those skilled in the art, detailed description of these related operations is not necessary; they can fully understand the related operations based on the description in the specification and general technical knowledge in the art.

[0065] Furthermore, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various embodiments. At the same time, the steps or actions in the method description can be rearranged or adjusted in a manner obvious to those skilled in the art. Therefore, the various orders in the specification and drawings are only for the clear description of a particular embodiment and do not imply a necessary order, unless otherwise stated that a particular order must be followed.

[0066] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages).

[0067] The traditional method for manufacturing laminated battery cells involves passing electrode rolls through a die-cutting machine to create electrode sheets, which are then collected into a material box and transferred to a laminating machine via a material box conveyor line. After the material box is positioned, an electrode sheet loading robot picks the sheets up and places them onto the laminating platform to form battery cells. After adhesive is applied, the cells are conveyed to the next process. However, current laminating equipment and processes can only take single electrode sheets for lamination, resulting in a slow equipment cycle and low production efficiency. To meet market demand and increase production capacity, multiple cutting and laminating machines need to operate simultaneously. However, multiple cutting and laminating machines require a large floor space and high equipment costs.

[0068] In this embodiment of the invention, a lithium battery cutting and stacking integrated machine and its production process are disclosed. It integrates unwinding, sheet making, stacking, hot pressing and adhesive application into one unit, including all the processes of lithium battery stacking. It realizes one-time complete cutting and stacking of positive electrode, negative electrode and separator. It adopts the thermal composite technology route to realize one-time complete cutting and stacking of positive electrode, negative electrode and separator, so as to improve the production efficiency of lithium battery.

[0069] According to the first aspect, one embodiment provides a lithium battery cutting and stacking integrated machine; please refer to [reference needed]. Figure 1 and Figure 2The system includes: a frame 1 for supporting and mounting the various units of the slicing and stacking machine; and a negative electrode unwinding and cutting unit 2, located at the front end of the frame 1, comprising a negative electrode unwinding mechanism 21, a flying cutter mechanism 22, a diaphragm unwinding mechanism 23, a thermal bonding mechanism 24, and a negative electrode cutting mechanism 25. The negative electrode unwinding mechanism 21 unwinds the negative electrode roll, the flying cutter mechanism 22 cuts the negative electrode roll into negative electrode sheets, the diaphragm unwinding mechanism 23 has two sets of diaphragms unwinding at the upper and lower positions of the negative electrode sheets, and the thermal bonding mechanism 24 presses the upper diaphragm, the negative electrode sheet, and the lower diaphragm together. The machine is equipped with a composite material forming unit, a negative electrode cutting mechanism 25 for cutting the composite material into composite sheets; a positive electrode unwinding and cutting unit 3, located at the front end of the frame 1, unwinds the positive electrode roll and cuts it into positive electrode sheets; an electrode sheet conveying unit 4, distributed along the feeding direction, is used to feed the positive electrode sheets and composite sheets into the next process for stacking; a stacking unit 5 is used to alternately stack the positive electrode sheets and composite sheets to form a battery cell; a hot pressing unit 6 is used to hot press and shape the battery cell; and an adhesive application unit 7 is used to apply adhesive to the battery cell.

[0070] The lithium battery cutting and stacking integrated machine disclosed in this embodiment unwinds the negative electrode unwinding and cutting unit 2 and the positive electrode unwinding unit. The negative electrode sheet and the two layers of separator have been combined into a composite sheet by the thermal composite mechanism 24 before entering the stacking unit 5. Then, the sheets are stacked and glued to complete the battery production. This application can integrate unwinding, sheet making, stacking, hot pressing and glue application into one unit, including all the processes of lithium battery stacking. It can realize the one-time complete cutting and stacking of positive electrode, negative electrode and separator, and there is no separator tail roll after stacking, which avoids the problems of internal wrinkles of separator and separator wrinkles of tail roll during the stacking process.

[0071] In this embodiment, the equipment also includes a control system that is electrically connected to and controls each unit, enabling the entire process of the lithium battery cutting and stacking machine to be fully automated, with high speed and high capacity conversion. This can effectively improve equipment timing and reduce equipment manufacturing costs. The process actions of the mechanism are effectively combined, resulting in high space utilization.

[0072] For further details, please refer to... Figure 1 and Figure 2 Both the positive electrode unwinding unit and the negative electrode unwinding unit are located at the front end of the frame 1 and are arranged separately side by side. The negative electrode unwinding and cutting unit 2 is provided with two unwinding lines, namely, the negative electrode unwinding mechanism 21 and the flying cutting mechanism 22 are provided in two sets. The two sets of flying cutting mechanisms 22 alternately feed the negative electrode sheet 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 web guiding system 213, a tension control system 214, and an electrode tab detection module 215, all mounted on the frame 1. For details, please refer to [link / reference needed]. Figure 5The diagram shows the negative electrode conveyor belt. The negative electrode unwinding mechanism 21 unwinds the material from the front unwinding roller, corrects the material deviation by the unwinding correction roller, and corrects the deviation by the process correction roller. The tension of the coil is controlled by the tension swing roller and the tension roller. During the conveyor belt process, the front and back tabs of the negative electrode coil are detected by the tab detection module 215. The two unwinding lines are finally fed into two sets of flying cutting mechanisms 22 for cutting.

[0074] Please refer to Figure 4 and Figure 6 In this application, two sets of flying cutting mechanisms 22 alternately feed materials to the thermal composite mechanism 24. The flying cutting components adopt "follow-up cutting and feeding", negative electrode "double-blade cutting", electromagnetic heating composite 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 cutting component 226, and a clamping component 227 sequentially installed on the lower frame 222 along the feeding direction. The feeding component 251 is used to pull the composite material belt to the cutting position of the cutting component 226 along the feeding direction. The clamping component 227 is used to clamp and position the composite material. The power component 224 is used to drive the cutting component 226 to reciprocate in the vertical direction. The cutting component 226 is used to cut material 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 cut composite sheet into the thermal composite mechanism 24.

[0076] In this application, the negative electrode roll is fed by the feeding assembly 251 until it reaches the cutting position below the cutting assembly 226. The negative electrode roll is clamped and positioned by the clamping assembly 227 at the rear end of the mechanism. The cutting assembly 226 is lowered by the power assembly 224 to cut the negative electrode roll into single composite sheets. Then, the tracking assembly 223 drives the clamping assembly 227 to move forward along the feeding direction and feeds the cut electrode sheets into the next process. At the same time, when the tracking assembly 223 retracts, the feeding assembly 251 continues to feed to prevent the material from retracting. This application effectively combines the slicing, feeding, and clamping structures of the flying cutting mechanism 22, saving design costs and space, making the structure more reasonable and concentrated, and reducing the cost increase caused by additional structures.

[0077] Please refer to Figure 4 and Figure 6The tracking component 223 includes a linear module and a feeding unit. The linear module is set 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 set as a square frame structure. 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 move 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, that is, it drives the clamping component 227, the cutting component 226 and the feeding component 251 to send the cut electrode sheet to the next process for thermal bonding.

[0078] In this embodiment, the clamping component 227, the cutting component 226, and the feeding component 251 can use existing technologies for clamping, cutting, and feeding, which will not be described in detail here.

[0079] For further details, please refer to... Figure 4 and Figure 7 , Figure 7 The diagram shows two sets of diaphragm conveyors 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 achieved by the overall correction of the large plate. The diaphragm unwinding mechanism 23 includes a diaphragm unwinding assembly 231 and a flattening assembly 232 disposed on the negative electrode substrate 211. The diaphragm unwinding assembly 231 is also unwound by the front unwinding roller, and tension is detected midway. The tension is controlled by the corresponding tension swing roller. The flattening assembly 232 is disposed on the side of the diaphragm conveyor near the composite unit and is used to flatten the diaphragm.

[0080] For details, please refer to Figure 8 and Figure 9 The flattening component 232 includes an arc-shaped mandrel 2321 and a flattening roller 2322 sleeved on the arc-shaped mandrel 2321. The arc-shaped mandrel 2321 is fixed to the negative electrode substrate 211 and is set to be arc-shaped in the circumferential direction. The flattening roller 2322 is correspondingly set to be arc-shaped. The flattening roller 2322 is rotatable relative to the arc-shaped mandrel 2321. The flattening roller 2322 is set on the feeding path of the diaphragm roll. In this embodiment, the flattening roller 2322 is set as a rubber roller. When the flattening component 232 is running, the arc-shaped mandrel 2321 does not rotate, but the surface flattening roller 2322 rotates. When the diaphragm passes the arc-shaped corner of the flattening roller 2322, a lateral velocity (i.e., lateral force) is generated. This velocity (force) plays a flattening role.

[0081] In this embodiment, the negative electrode feeding mechanism and the positive electrode feeding mechanism are designed to be compatible, and are monitored and displayed in real time. An alarm is triggered for abnormal tension, and the tension can be set.

[0082] For further details, please refer to... Figure 10The thermal bonding mechanism 24 includes a thermal bonding component 241, a camera detection module 242, and an edge sealing component 243 arranged sequentially. A thermal bonding feeding roller is provided at the inlet of the thermal bonding component 241. The negative electrode sheet and the upper and lower diaphragms enter the thermal bonding component 241 through the feeding roller and are thermally bonded to form a composite material by the corresponding bonding roller of the thermal bonding component 241. The camera detection module 242 uses a CCD industrial camera to capture and detect the spacing between adjacent electrodes and the front and back sides (NS), confirm the edge sealing position accuracy, and provide timely feedback. The detected composite material enters the edge sealing component 243 and is edge-sealed by the edge sealing roller of the edge sealing component 243. The pressure of the cylinders at both ends of the bonding roller and the edge sealing roller must be equal, and both of them are at the same speed as the feeding roller at the front end during operation.

[0083] For further details, please refer to... Figure 11 and Figure 12 , Figure 12 The diagram shows the positive electrode unwinding unit, which 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 mounted on the frame 1. The positive electrode unwinding mechanism 31 unwinds the material from the front unwinding roller, corrects the material deviation through the unwinding correction roller, and corrects the deviation through the process correction roller. The tension of the roll is controlled by the tension swing roller and the tension roller. Before entering the positive electrode cutting mechanism 32, the roll is adjusted by the buffer roller and the pressure roller to ensure the flatness and tension of the roll when it enters the positive electrode cutting mechanism 32.

[0084] In this embodiment, please refer to Figure 4 and Figure 13 The positive electrode cutting mechanism 32 and the negative electrode cutting mechanism 25 have similar structures. The specific details can be designed and replaced according to the site. Specifically, it includes a feeding assembly 251 and a hot cutting assembly 252. The feeding assembly 251 is used to support and drive the material to move along the feeding direction on the worktable. The hot cutting assembly 252 is set along the feeding direction on the material feeding path and includes a hot cutting drive, a hot cutting frame 1 and a hot cutting blade set on the hot cutting frame 1. The hot cutting blade is set perpendicular to the feeding direction. The hot cutting drive is connected to the hot cutting blade to drive the hot cutting blade to descend and cut the material. The feeding assembly 251 supports and drives the roll material to move along the feeding direction until it passes through the hot cutting assembly 252 and reaches the hot cutting position. The hot cutting drive drives the hot cutting blade to descend and cut the material. In this embodiment, the hot cutting component 252 is provided in two sets, and each hot cutting component 252 is provided with a feeding component 251 on both sides, that is, the feeding component 251 is provided in three sets. The feeding component 251 can be used to compensate for the feeding length of the feeding component 251, and the specific design of each component can be designed according to the existing technical solution, which will not be described in detail here.

[0085] Please refer to Figure 1 and Figure 14Both the positive electrode cutting mechanism 32 and the negative electrode cutting mechanism 25 are mounted on the electrode conveying unit 4, which is used to transport single positive electrode sheets and composite sheets. Specifically, the electrode conveying unit 4 uses belt conveying, including independently set detection belt section 41, rejection belt section 42, and buffer belt section 43. The detection belt section 41 is equipped with a size detection mechanism 44 and a defect detection mechanism 45. The size detection mechanism 44 is used to detect the electrode size and V-angle size and provide feedback correction. The defect detection mechanism 45 is used to detect whether there are defects in the coating on the electrode surface. The rejection belt section 42 is used to reject electrodes with NG size and defects, and to transport the replacement sheets to the stacking unit 5. The buffer belt section 43 is equipped with buffer platforms at both ends. One buffer platform is used to place multiple electrodes for stacking and loading, and the other buffer platform is used for hot pressing and buffering the battery cells.

[0086] Please refer to Figure 14 The detection belt section 41 and the rejection belt section 42 are each provided in two sets, which correspond to the single-piece transportation and detection of positive and negative electrodes, respectively. The detection belt section 41 is used to transport the electrode sheet to the stacking unit 5. The rejection belt section 42 rejects the NG electrode sheet and performs replacement during the transportation process of the detection belt section 41, and then enters the stacking unit 5.

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

[0088] Please refer to Figure 16 The electrode handling mechanism 53 includes a handling bracket 531 and a primary handling robot 532 and a secondary handling robot 533 mounted on the handling bracket 531. The primary handling robot 532 transports the electrode from the electrode conveying unit 4 to the correction mechanism 51 for correction; the secondary handling robot 533 transports the corrected electrode from the correction mechanism 51 to the stacking mechanism 52 for stacking. In this embodiment, two sets of primary handling robots 532 and two sets of secondary handling robots 533 are provided, respectively for transporting positive electrode sheets and composite sheets.

[0089] Please refer to Figure 17The correction mechanism 51 includes a frame 511 and multiple sets of bearing components 512, detection components 513, and correction components 514 mounted on the frame 511. The electrode conveying mechanism 53 picks up the electrode and places it onto the bearing components 512. The multiple sets of bearing components 512 are arranged side by side and used to adsorb materials. Each bearing component 5121 has a hollow bearing cavity and multiple suction holes that communicate with the bearing cavity. The suction holes are used to adsorb materials. A light source is provided on one side of the bearing plate 5121. The detection component 513 is located on the side of the bearing plate 5121 away from the light source. The detection component 513 is used to detect the positional deviation of the material. The correction mechanism 51 is connected to the bearing components 512 one by one and is used to adjust the position of the bearing components 512.

[0090] For details, please refer to Figure 17 The bearing plate 5121 is set with 8 plates evenly distributed side by side, enabling multi-station correction. The number and size of the bearing plate 5121 can be set according to the site conditions, and it can be compatible with large-size electrode correction.

[0091] Please refer to Figure 16 In this embodiment, the handling robot has multiple degrees of freedom. A handling plate is provided at the front end of the handling robot. The handling plate is hollow to form a handling cavity. Multiple suction nozzles are provided on the handling plate and communicate with the handling cavity. The suction nozzles are used to adsorb or hold the electrode sheets. When the handling plate is turned on with negative pressure, the electrode sheets are adsorbed on the electrode sheet conveying unit 4 through the suction nozzles. The handling robot transports the electrode sheets to the top of the support plate 5121 and descends along the Z-axis to place the electrode sheets on the support plate 5121 for correction. After correction, the electrode sheets are transported to the stacking mechanism 52 for stacking in the same way.

[0092] In this embodiment, the stacking mechanism 52 is equipped with a stacking platform, a stacking platform lifting assembly, a stacking platform pressing assembly, and a stacking platform translation assembly. After positioning, the electrode sheets are stacked onto the stacking platform in the set quantity. The pressing blades of the stacking platform pressing assembly complete the cell pressing function from both sides of the cell. The positive electrode sheet and the composite sheet alternately complete the stacking action. The specific schemes of the correction mechanism 51 and the stacking mechanism 52 can adopt existing technology designs, and the specific details are not described in detail. The positive electrode sheet or composite sheet is picked up 8p / time from the electrode sheet conveying unit 4 by the handling robot and transported to the correction mechanism 51. The correction mechanism is performed by taking pictures and positioning on the 8 sets of carrier plates 5121. Then, the positioning 8p material is transported to the stacking mechanism 52 in one go by the secondary handling robot 533 to complete the stacking action.

[0093] For further details, please refer to... Figure 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 for holding the battery cell and turning it to place it into the hot pressing cavity of the hot pressing mechanism 62. The hot pressing mechanism 62 hot presses the battery cell in the hot pressing cavity. The hot pressing unloading robot 63 has four grippers for holding the battery cell away from the hot pressing cavity of the hot pressing mechanism 62.

[0094] Please refer to Figure 18 and Figure 19 The hot pressing mechanism 62 includes 4 sets of hot pressing brackets 621, and a hot pressing cavity is formed inside the hot pressing bracket 621. Each hot pressing cavity is provided with 4 inlets and a corresponding hot pressing device 622. The hot pressing loading robot 61 simultaneously clamps 4 sets of battery cells and puts them into the corresponding hot pressing device 622 for hot pressing. After hot pressing is completed, the hot pressing unloading robot 63 clamps 4 sets of battery cells and puts them into the next process.

[0095] Please refer to Figure 19 , Figure 20 and Figure 21 The hot pressing device 622 is generally equipped with an upper pressure plate 6221 and a lower pressure plate 6222. The battery cell is placed between the upper pressure plate 6221 and the lower pressure plate 6222. The Teflon 6223 is distributed close to the upper pressure plate 6221 and the lower pressure plate 6222. The Teflon 6223 corresponding to the upper pressure plate 6221 has an anti-sticking mechanism 6224, which is specifically set 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 moved away in advance to avoid interference with the robot's gripper. Before the gripper enters, the roller presses the Teflon 6223 in advance to achieve active deformation.

[0096] In this embodiment, hot pressing of the cell can improve the flatness of the lithium-ion battery, ensuring that the cell thickness meets the requirements and has high consistency; it can also eliminate separator wrinkles, expel air from inside the cell, and make the separator and positive and negative electrode plates fit tightly together, shortening the lithium-ion diffusion distance and reducing the battery's internal resistance.

[0097] For further details, please refer to... Figure 22 , Figure 23 , Figure 24 and Figure 25The adhesive application unit 7 is used to apply side adhesive and QR codes to the battery cells. It includes a transfer platform 71, a transfer robot 72, a battery cell unloading robot 73, an adhesive application mechanism 74, a QR code application mechanism 75, and an NG pull belt 76. The hot-press battery cell unloading robot 73 holds four sets of battery cells and places them on the transfer platform 71. The adhesive application mechanism 74 has an adhesive application platform and an adhesive application device. The transfer robot 72 picks up the battery cells from the transfer platform 71 and places them on the adhesive application platform. After the adhesive application device completes the adhesive application on one side, the platform rotates 180° to apply adhesive to the other side of the battery cell. The battery cell unloading robot 73 picks up the battery cells with the side adhesive completed and places them at the QR code application mechanism 75 to apply the QR code. After the adhesive application is completed, the NG battery cells are placed on the NG pull belt 76, and the OK battery cells are directly unloaded.

[0098] The lithium battery cutting and stacking machine in this embodiment employs thermal lamination technology to achieve one-time complete slicing and stacking of the positive electrode, negative electrode, and separator, effectively improving the quality and production rate of the stacked cells. During the lamination process, the stacking platform does not reciprocate; the negative electrode sheet and the two separator layers are already heat-bonded into units before entering the stacking platform, and there is no separator tail roll after stacking, avoiding internal and tail roll wrinkles in the separator during the stacking process. The separator moves at a uniform speed throughout the entire stacking process, avoiding alternating separator tension, resulting in more accurate visual inspection of the thermally laminated sheets with near-zero error rates. Furthermore, the lamination process improves the adhesion between the positive and negative electrode sheets and the separator, resulting in better interface retention. During reagent usage, high-precision control technology for composite unit die-cutting, high-precision synchronous control technology for electrode tracking and feeding, and high-precision electrode positioning and correction detection technology are used to achieve synchronization of over 200 axes and simultaneous visual inspection by 100 CCDs, enabling online full inspection of separator wrinkles.

[0099] Please refer to the second aspect. Figures 1-26 One embodiment provides a lithium battery cutting and stacking production process, which uses the above-mentioned lithium battery cutting and stacking integrated machine and includes 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 roll material, and corrects the deviation through the deviation correction system 213 and adjusts the tension through the tension control system 314 during the unwinding process.

[0103] The positive electrode roll is cut into a positive electrode sheet by the positive electrode cutting mechanism 32;

[0104] Electrode size and appearance are inspected by size inspection mechanism 44 and defect inspection mechanism 45, and NG are rejected.

[0105] Negative electrode unwinding:

[0106] The negative electrode unwinding mechanism 21 unwinds the negative electrode roll material, and corrects the deviation through the deviation correction system 213 during the unwinding process, adjusts the tension through the tension control system 314, and detects the negative electrode tabs through the tab detection module 215.

[0107] The negative electrode roll is cut into negative electrode sheets by a double flying cutter 22 and fed alternately and continuously.

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

[0109] The negative electrode sheet is laminated between two sets of diaphragm rolls by a thermal lamination mechanism 24 to form a composite material and then the edges are sealed.

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

[0111] Electrode size inspection and composite sheet appearance inspection are performed by size inspection mechanism 44 and defect inspection mechanism 45, and NG is rejected.

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

[0113] The positive electrode sheet and the composite sheet are corrected by the correction mechanism 51 respectively. After the correction is completed, the positive electrode sheet and the composite sheet are alternately stacked by the stacking mechanism 52 to form a battery cell.

[0114] The hot pressing loading robot 61 picks up the battery cells on the buffer platform and places them in the hot pressing unit 6 for inspection and hot pressing shaping. NG battery cells are not hot pressed.

[0115] Hot pressing unloading robot 63 unloads battery cells to transfer platform 71, transfer robot 72 picks up battery cells to complete side adhesive application, unloading robot 73 picks up the glued battery cells to affix QR codes, and detects NG battery cells to flow out to NG pull belt 76.

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

[0117] The above examples illustrate the present invention only to aid in understanding it and are not intended to limit the scope of the invention. Those skilled in the art can make various simple deductions, modifications, or substitutions based on the principles of this invention.

Claims

1. A lithium battery cutting and stacking integrated machine, characterized in that, include: Rack (1); The negative electrode unwinding and cutting unit (2) is located at the front end of the frame (1) and includes a negative electrode unwinding mechanism (21), a flying cutter mechanism (22), a diaphragm unwinding mechanism (23), a thermal bonding mechanism (24), and a negative electrode cutting mechanism (25). The negative electrode unwinding mechanism (21) unwinds the negative electrode roll material, the flying cutter mechanism (22) cuts the negative electrode roll material into negative electrode sheets, the diaphragm unwinding mechanism (23) is provided with two sets of diaphragms that are respectively unwinding the diaphragm at the upper and lower positions of the negative electrode sheets, the thermal bonding 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. The negative electrode unwinding and cutting unit (2) is provided with two unwinding lines. The negative electrode unwinding mechanism (21) and the flying cutting mechanism (22) are provided in two sets. The two sets of flying cutting mechanisms (22) alternately feed the negative electrode sheet into the negative electrode cutting mechanism (25). The diaphragm unwinding mechanism (23) includes a negative electrode substrate (211) and a diaphragm unwinding assembly (231) and a flattening assembly (232) disposed on the negative electrode substrate (211). The flattening assembly (232) includes an arc-shaped mandrel (2321) and a flattening roller (2322) sleeved on the arc-shaped mandrel (2321). The arc-shaped mandrel (2321) is fixed to the negative electrode substrate (211) and is circumferentially arc-shaped. The flattening roller (2322) is rotatable relative to the arc-shaped mandrel (2321). The flattening roller (2322) is disposed on the feeding path of the diaphragm roll. A positive electrode unwinding and cutting unit (3) is provided at the front end of the frame (1). The positive electrode unwinding and cutting unit (3) unwinds the positive electrode roll and cuts the positive electrode roll into positive electrode sheets. The electrode conveying unit (4) is distributed along the feeding direction and is used to feed the positive electrode and the composite sheet into the next process for stacking. The stacking unit (5) is used to alternately stack the positive electrode sheet and the composite sheet to form a battery cell; Hot pressing unit (6) is used for hot pressing and shaping of the battery cell; as well as The adhesive application unit (7) is used to apply adhesive to the battery cell.

2. The lithium battery cutting and stacking integrated machine as described in claim 1, characterized in that, The flying cutting mechanism (22) includes 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 cutting assembly (226), and a clamping assembly (227) sequentially installed on the lower frame (222) along the feeding direction; the feeding assembly (251) is used to pull the composite material belt along the feeding direction. The material moves in the direction of the cutting direction to the cutting position of the cutting assembly (226); the clamping assembly (227) is used to clamp and position the composite material; the power assembly (224) is used to drive the cutting assembly (226) to reciprocate in the vertical direction; the cutting 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 send the composite sheet that has been cut into the thermal composite mechanism (24).

3. The lithium battery cutting and stacking integrated machine as described in claim 1, characterized in that, The stacking unit (5) includes a correction mechanism (51), a stacking mechanism (52), and an electrode transport mechanism (53). The correction mechanism (51) is used to adjust the electrode to a set position. The electrode transport mechanism (53) is used to transfer the positive electrode and the composite electrode between the electrode transport unit (4), the correction mechanism (51), and the stacking mechanism (52). The stacking mechanism (52) is used to stack the positive electrode and the negative electrode sequentially to form a battery cell.

4. The lithium battery cutting and stacking integrated machine as described in claim 3, characterized in that, The electrode transport mechanism (53) includes 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 from the electrode conveying unit (4) to the correction mechanism (51) for correction. The secondary transport robot (533) transports the corrected electrode from the correction mechanism (51) to the stacking mechanism (52) for stacking.

5. The lithium battery cutting and stacking integrated machine as described in claim 3, characterized in that, The correction mechanism (51) includes an equipment frame (511) and multiple sets of bearing components (512), detection components (513) and correction components (514) arranged on the equipment frame (511); the electrode conveying mechanism (53) acquires the electrode onto the bearing component (512), the multiple sets of bearing components (512) are arranged side by side and used to adsorb materials, and the number of bearing components (512) is not less than the number of conveying mechanisms (53); the detection component (513) is used to detect the position deviation value of the material, the correction mechanism (51) is connected to the bearing component (512) one by one, and the correction mechanism (51) is used to adjust the position of the bearing component (512).

6. The lithium battery cutting and stacking integrated machine as described in claim 1, characterized in that, The electrode conveying unit (4) uses belt conveyor and includes an independently set detection belt section (41), rejection belt section (42) and buffer belt section (43). The detection belt section (41) is equipped with a size detection mechanism (44) and a defect detection mechanism (45). The size detection mechanism (44) is used to detect the electrode size and V-angle size and perform feedback correction. The defect detection mechanism (45) is used to detect whether there are defects in the coating on the electrode surface. The rejection belt section (42) is used to reject electrodes with NG size and defects and to transport the replacement electrode to the stacking unit (5). The buffer belt section (43) passes through the stacking unit (5) and the hot pressing unit (6). The buffer belt section (43) is equipped with buffer platforms at both ends.

7. A lithium battery manufacturing process, employing the lithium battery cutting and stacking integrated machine as described in any one of claims 1-6, characterized in that, The process includes the following steps: 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 and the composite electrode are respectively transported to the stacking unit (5) through the corresponding electrode transport unit (4); The electrode conveying unit (4) transports the positive electrode and composite sheet to the stacking unit (5) for correction and alternating stacking to form a battery cell; The battery cells are hot-pressed and shaped in the hot pressing unit (6); The battery cell is fed into the adhesive application unit (7) to complete the adhesive application process; The battery cells are unloaded onto the designated logistics line.

8. The lithium battery manufacturing process as described in claim 7, characterized in that, The negative electrode and the diaphragm are unwound and cut to form a composite sheet with upper and lower diaphragms, comprising: The negative electrode unwinding mechanism (21) unwinds the negative electrode roll and corrects deviations during the unwinding process; Roll material appearance inspection; The negative electrode roll is cut into negative electrode sheets by a flying cutter (22); Two sets of diaphragm unwinding mechanisms (23) unwind the diaphragm roll and correct its deviation during the unwinding process; The negative electrode sheet is bonded between the two sets of diaphragm rolls through a thermal bonding mechanism (24) to form a composite material and then sealed. The composite material is cut into composite sheets by a negative electrode cutting mechanism (25).

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