Composite laser cutting and folding all-in-one machine

Abstract

The application relates to a composite laser cutting and folding all-in-one machine and relates to the technical field of battery preparation. The composite laser cutting and folding all-in-one machine comprises a negative electrode material line mechanism, a double unwinding diaphragm material line mechanism, a negative electrode rolling assembly, a positive electrode material line mechanism, a positive electrode composite assembly, a detection mechanism, a double-sided rubberizing mechanism, a tail material collecting mechanism, a double-station stacking mechanism and an offline patching mechanism. Composite sheets are detected by the detection mechanism, NG sheets are identified, rubberizing is realized by the double-sided rubberizing mechanism, an anti-rubberizing layer is formed, and the tail material collecting mechanism collects diaphragm tail materials at the connecting rubber belt position, so that the influence of the belt connection position on the battery cell is avoided, the entire battery cell is prevented from being scrapped, and material waste is avoided. Because the anti-rubberizing layer is arranged, the offline patching mechanism can re-expand and patch the NG battery cell formed after the stacking, online detection and offline patching can be realized, defective products can be patched in time, the good product rate of the battery cell is improved, and the production efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of battery manufacturing technology, and more specifically, to a composite laser cutting and stacking integrated machine. Background Technology

[0002] In previous projects, the diaphragm unwinding was done using a single unwinding method. When the diaphragm needed to be replaced, the machine had to be stopped and the diaphragm roll manually replaced. When the diaphragm was spliced, tape was used to connect the layers, causing the entire cell at the splicing point to be scrapped, resulting in waste of qualified electrode sheets and diaphragms, and increasing production costs.

[0003] Composite strip inspection involves using a line scanning assembly before the electrode cutter to check for defects such as breakage, stains, or localized dimensional deviations on the incoming electrodes. During the strip conveying process, electrode scratches and breakages often occur. However, line scanning cameras are expensive, and the vertical scanning of the electrode tabs makes the results inaccurate. Furthermore, it cannot detect various defective products on the composite strip, leading to a decrease in the yield rate of produced cells. Defective products still need to be manually picked out, reducing efficiency. Summary of the Invention

[0004] The purpose of this application is to provide a composite laser cutting and stacking integrated machine that can provide continuous diaphragms and collect diaphragm tailings, avoiding the complete scrapping of cells at the splicing position and preventing material waste. Simultaneously, it can achieve online inspection and offline patching, promptly patching defective products, improving the cell yield and increasing production efficiency.

[0005] To achieve the above objectives, the embodiments of the present invention employ the following solutions:

[0006] In a first aspect, the present invention provides a composite laser cutting and stacking integrated machine, comprising:

[0007] A negative electrode material wire mechanism is used to provide negative electrode material strips and cut the negative electrode material strips into negative electrode unit sheets;

[0008] A double unwinding diaphragm production line mechanism is used to provide continuous diaphragms, and the joints of the diaphragms are provided with connecting tape with color marks;

[0009] A negative electrode rolling assembly is disposed on the discharge side of the negative electrode feed line mechanism and the diaphragm feed line mechanism, and is used to roll and combine the diaphragm and the negative electrode unit sheet;

[0010] A positive electrode material wire mechanism is used to provide positive electrode material strips and cut the positive electrode material strips into positive electrode unit sheets;

[0011] A positive electrode composite assembly is disposed on the discharge side of the positive electrode feed line mechanism and the negative electrode rolling assembly, and is used to thermally composite the positive electrode unit sheet, the separator and the negative electrode unit sheet to form a composite sheet;

[0012] The testing mechanism is located on the discharge side of the positive electrode composite assembly and is used to test the composite sheet.

[0013] A double-sided adhesive applicator is provided on the discharge side of the testing mechanism to apply adhesive to both sides of the defective electrode portion in the composite sheet and form an anti-sticking adhesive layer.

[0014] A tail material collection mechanism is provided on the discharge side of the double-sided adhesive bonding mechanism to collect the diaphragm tail material at the connecting tape on the composite sheet;

[0015] A dual-station stacking mechanism is provided on the discharge side of the tail material collection mechanism for stacking the composite sheets to form a battery cell.

[0016] An offline patching mechanism is located on the discharge side of the dual-station stacking mechanism and is used to patch NG cells during unfolding.

[0017] In an optional embodiment, the tailings collection mechanism includes a dual-drive assembly, a first hot electrode cutter, a second hot electrode cutter, and a tailings collection gripper. The dual-drive assembly has a drive channel for the composite sheet to pass through. The first hot electrode cutter, the second hot electrode cutter, and the tailings collection gripper are all disposed within the dual-drive assembly. The first hot electrode cutter and the second hot electrode cutter are spaced apart on one side of the drive channel to cut the diaphragm tailings at the connecting tape on the composite sheet. The tailings collection gripper is disposed between the first hot electrode cutter and the second hot electrode cutter and can extend into and out of the drive channel to collect the diaphragm tailings.

[0018] In an optional embodiment, the dual-drive assembly includes a dual-drive housing, a color mark detector, a first drive roller group, and a second drive roller group. The first drive roller group and the second drive roller group are spaced apart in the dual-drive housing and form the drive channel. The color mark detector is located on the feed side of the dual-drive housing and is used to detect color marks on the composite sheet. The tail material collection gripper is located between the first drive roller group and the second drive roller group.

[0019] In an optional embodiment, the offline patching mechanism includes a unit wafer hopper, an NG cell hopper, a cell patching assembly, a cell hot pressing assembly, and an adhesive application platform arranged sequentially. The unit wafer hopper stores unit wafers for patching. The NG cell hopper stores NG cells stacked by the dual-station stacking mechanism. The cell patching assembly unfolds the NG cells and performs patching. The cell hot pressing assembly hot presses the patched NG cells. The adhesive application platform applies adhesive to the hot-pressed NG cells to form qualified cells.

[0020] In an optional embodiment, the offline patching mechanism further includes a transfer track, a transfer robot, a hot-press loading robot, and a hot-press unloading robot. The transfer robot is slidably mounted on the transfer track and can move between the unit cell material bin, the NG cell material box, and the cell patching assembly to achieve material transfer. The hot-press unloading robot and the hot-press loading robot are both mounted on the transfer track, and the hot-press loading robot is positioned between the cell patching assembly and the cell hot-pressing assembly to deliver the patched NG cell to the cell hot-pressing assembly. The hot-press unloading robot is positioned between the cell patching assembly and the adhesive application platform to deliver the hot-pressed NG cell to the adhesive application platform.

[0021] In an optional embodiment, the double unwinding diaphragm production line mechanism includes a first diaphragm unwinding roller, a second diaphragm unwinding roller, an automatic diaphragm splicing platform, a diaphragm pressing platform, and a glue preparation platform. The automatic diaphragm splicing platform is disposed between the first diaphragm unwinding roller and the second diaphragm unwinding roller. The diaphragm pressing platform is disposed on the automatic diaphragm splicing platform and is used to press the connection point of the diaphragm. The glue preparation platform is provided with a tape rotating cylinder, which is used to adhere the connecting tape to the connection point of the diaphragm.

[0022] In an optional embodiment, the testing mechanism includes a composite sheet testing component and a short-circuit testing component. The composite sheet testing component is disposed on the discharge side of the positive electrode composite component and is used to detect the tab height of the composite sheet. The short-circuit testing component is disposed on the side of the composite sheet testing component away from the positive electrode composite component and is used to perform short-circuit testing on the positive electrode unit and the negative electrode unit on the composite sheet.

[0023] In an optional embodiment, the short-circuit test assembly includes a linear motor and a four-position short-circuit detection pressure block. The linear motor is connected to the four-position short-circuit detection pressure block for driving the four-position short-circuit detection pressure block to move synchronously with the composite sheet and press it onto the tabs of the composite sheet to perform a short-circuit test.

[0024] In an optional embodiment, the short-circuit test assembly includes a timing pulley, a timing belt, and multiple short-circuit detection blocks. The timing belt is wound around the timing pulley, and the multiple short-circuit detection blocks are disposed on the timing belt. The timing pulley is used to drive the timing belt to move so that one side of the timing belt moves synchronously with the composite sheet. The short-circuit detection blocks are used to contact the tabs on the composite sheet and perform a short-circuit test.

[0025] In an optional embodiment, the composite sheet detection assembly includes a front camera, a back camera, a front light source, a back ring light source, a front ring light source, and a back light source. The front camera is spaced apart on the front side of the composite sheet, the front ring light source is disposed between the front camera and the composite sheet, the back light source is disposed on the side of the composite sheet away from the front ring light source, the back camera is disposed on the back side of the composite sheet and offset from the front camera, the back ring light source is disposed between the composite sheet and the back camera, and the front light source is disposed on the side of the composite sheet away from the back ring light source.

[0026] Through the above technical solution, this embodiment of the invention utilizes a negative electrode feed line mechanism and a positive electrode feed line mechanism to respectively transport negative electrode unit sheets and positive electrode unit sheets. Simultaneously, a double unwinding diaphragm feed line mechanism provides a continuous diaphragm, and color-coded connecting tape is affixed to the diaphragm joints. A negative electrode rolling assembly can roll and composite the diaphragm and negative electrode unit sheets, while a positive electrode composite assembly can thermally composite the positive electrode unit sheets with the rolled and composited diaphragm and negative electrode unit sheets to form a composite sheet. The composite sheet is inspected by an inspection mechanism to identify NG (non-performing) sheets, and then a double-sided adhesive applicator is used to apply adhesive, forming an anti-sticking layer. A tail material collection mechanism collects the diaphragm tail material at the connecting tape, thereby preventing the tape joint from affecting the battery cell, avoiding the complete scrapping of the battery cell, and preventing material waste. Because of the anti-sticking layer, an offline patching mechanism can re-unroll and patch NG battery cells formed after stacking, enabling online inspection and offline patching. Defective products are patched in a timely manner, improving the battery cell yield and increasing production efficiency.

[0027] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the composite laser cutting and stacking machine provided in this application;

[0030] Figure 2 A schematic diagram of another composite laser cutting and stacking machine provided in this application;

[0031] Figure 3 for Figure 1 Schematic diagram of the tailings collection mechanism;

[0032] Figure 4 for Figure 1 Schematic diagram of the double unwinding diaphragm production line mechanism;

[0033] Figure 5 for Figure 1 A schematic diagram of the offline patching mechanism;

[0034] Figure 6 for Figure 1 Schematic diagram of the structure of the medium- and short-circuit test component;

[0035] Figure 7 for Figure 1 A schematic diagram of another short-circuit test component;

[0036] Figure 8 for Figure 1 A schematic diagram of the structure of the composite sheet detection component.

[0037] icon:

[0038] 100 - Composite laser cutting and stacking integrated machine; 110 - Negative electrode material line mechanism; 111 - Negative electrode double unwinding roller group; 112 - First negative electrode tension swing arm; 113 - Embossing roller; 114 - Negative electrode sheet line scanning assembly; 115 - Negative electrode laser cutting ear assembly; 116 - Negative electrode drive roller group; 117 - Second negative electrode tension swing arm; 118 - Negative electrode laser cutting assembly; 119 - Negative electrode feeding and waste rejection assembly; 120 - Double unwinding diaphragm material line mechanism; 121 - First diaphragm unwinding roller; 122 - Second diaphragm unwinding roller; 123 - Automatic diaphragm assembly 124 - Membrane clamping platform; 125 - Glue preparation platform; 130 - Negative electrode rolling assembly; 131 - Negative electrode rolling roller; 132 - Membrane drying oven; 140 - Positive electrode material line mechanism; 141 - Positive electrode double unwinding roller assembly; 142 - Positive electrode laser cutting tab assembly; 143 - V-angle punching assembly; 144 - Positive electrode drive assembly; 145 - Buffer assembly; 146 - Positive electrode tension swing arm; 147 - Positive electrode cutting assembly; 148 - Positive electrode accelerated rejection assembly; 150 - Positive electrode composite assembly; 160 - Detection mechanism; 161 - Composite assembly... Assembly and inspection components; 1611-Front-side camera; 1612-Reverse-side camera; 1613-Front-side light source; 1614-Reverse-side ring light source; 1615-Front-side ring light source; 1616-Reverse-side light source; 162-Short-circuit test component; 163-Linear motor; 164-Four-station short-circuit detection pressure block; 165-Synchronous pulley; 166-Synchronous belt; 167-Short-circuit detection block; 170-Double-sided adhesive applicator; 180-Waste material collection mechanism; 181-Dual-drive component; 182-First hot electrode cutter; 183-Second hot electrode cutter; 184-Electrode cutter; 185-Tail material collection gripper; 186-Dual drive housing; 187-Color mark detector; 188-First drive roller group; 189-Second drive roller group; 190-Dual station stacking mechanism; 200-Offline patching mechanism; 210-Unit sheet material bin; 220-NG cell material box; 230-Cell patching assembly; 240-Cell hot pressing assembly; 250-Adhesive application platform; 260-Transfer track; 270-Transfer robot; 280-Hot pressing loading robot; 290-Hot pressing unloading robot; 300-Electrode tab. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0040] In the description of this application, it should be noted that the terms "inner" and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0041] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "setup" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0042] It should be noted that, where there is no conflict, the features in the embodiments of this application can be combined with each other.

[0043] This invention provides a composite laser cutting and stacking integrated machine 100. This machine can provide continuous diaphragms and collect diaphragm tailings, preventing the entire cell at the splicing position from being scrapped and avoiding material waste. Simultaneously, it can achieve online inspection and offline patching, promptly patching defective products, improving the cell yield and increasing production efficiency.

[0044] See Figure 1 and Figure 2The composite laser cutting and stacking integrated machine 100 provided in this embodiment of the invention includes a negative electrode material wire mechanism 110, a double unwinding diaphragm material wire mechanism 120, a negative electrode rolling assembly 130, a positive electrode material wire mechanism 140, a positive electrode composite assembly 150, a detection mechanism 160, a double-sided adhesive applicator 170, a tailings collection mechanism 180, a dual-station stacking mechanism 190, and an offline patching mechanism 200. The negative electrode material wire mechanism 110 is used to provide negative electrode material strips and cut the negative electrode material strips into negative electrode unit sheets; the double unwinding diaphragm material wire mechanism 120 is used to provide continuous diaphragms, and the joints of the diaphragms are provided with connecting tapes with color marks; the negative electrode rolling assembly 130 is located on the discharge side of the negative electrode material wire mechanism 110 and the diaphragm material wire mechanism, and is used to roll and composite the diaphragms and negative electrode unit sheets; the positive electrode material wire mechanism 140 is used to provide positive electrode material strips and cut the positive electrode material strips into positive electrode units. The composite assembly 150 is located on the discharge side of the positive electrode feed line mechanism 140 and the negative electrode rolling assembly 130, and is used to thermally composite the positive electrode unit sheet, separator, and negative electrode unit sheet to form a composite sheet; the detection mechanism 160 is located on the discharge side of the positive electrode composite assembly 150 and is used to detect the composite sheet; the double-sided adhesive applicator 170 is located on the discharge side of the detection mechanism 160 and is used to apply adhesive to both sides of the defective electrode sheet portion in the composite sheet to form an anti-sticking adhesive layer; the tail material collection mechanism 180 is located on the discharge side of the double-sided adhesive applicator and is used to collect the separator tail material at the connecting tape on the composite sheet; the dual-station stacking mechanism 190 is located on the discharge side of the tail material collection mechanism 180 and is used to stack the composite sheets to form a battery cell; the offline patching mechanism 200 is located on the discharge side of the dual-station stacking mechanism 190 and is used to patch NG battery cells.

[0045] It should be noted that the double-sided adhesive applicator 170 applies adhesive to both sides of the detected defective electrode area. This can be done on the separator and positive electrode cell on both sides. For example, when the composite sheet is detected to be defective, adhesive can be applied to the defective positive electrode cell on the front side and the separator surface on the back side.

[0046] The negative electrode material strip mechanism 110 includes a negative electrode double unwinding roller group 111, a first negative electrode tension swing rod 112, an embossing roller 113, a negative electrode sheet line scanning assembly 114, a negative electrode laser cutting tab assembly 115, a negative electrode drive roller group 116, a second negative electrode tension swing rod 117, a negative electrode laser cutting assembly 118, and a negative electrode feeding and waste rejection assembly 119, arranged sequentially along the movement direction of the negative electrode strip. The negative electrode double unwinding roller group 111 is used to unwind the negative electrode strip, and the first negative electrode... Tension lever 112 and second negative electrode tension lever 117 are used to adjust the tension of the material strip. Embossing roller 113 is used to emboss the tab 300 position to add reinforcing ribs to the tab 300. After the negative electrode material strip is adsorbed by the vacuum belt and negative pressure vacuum roller, the negative electrode laser cutting tab assembly 115 laser-cuts the tab 300. Since the laser cutting of the tab 300 requires calculation of the formation of the negative electrode material strip, an encoding roller can be installed before the laser cutting of the tab 300. Negative electrode drive roller group 116 is used to drive the movement of the negative electrode material strip, and at the same time, the negative electrode feed rejection assembly 119 can reject unqualified negative electrode unit sheets.

[0047] The negative electrode laser cutting assembly 118 is used to cut the negative electrode strip into negative electrode unit sheets, so that the negative electrode unit sheets can be composited with the separator. Since the negative electrode strip is in high-speed motion during laser cutting, the laser needs to chase the strip to ensure that the cut is flush. The chasing angle is calculated by motion planning, and the laser beam chasing angle should be between 50° and 80°.

[0048] It should be noted that in this embodiment, the negative electrode wire mechanism 110 can be a single-channel laser-cut negative electrode solution, such as... Figure 1 Alternatively, a dual-path laser anode cutting solution can be used, such as... Figure 2 When using a single-path laser cutting scheme for the negative electrode, the laser cutting mechanism exists before the negative electrode feed rejection assembly. The speed of the laser-cut negative electrode unit sheet entering the negative electrode feed rejection assembly 119 is the same as the speed of the separator conveyor belt. When using dual-path laser cutting, the speed of the negative electrode unit sheet is half that of the separator. Therefore, a pair of accelerating rollers needs to be added before the feed rejection assembly to ensure that after the conveyor belt enters the negative electrode feed rejection accelerating rollers, the speed of the negative electrode sheet is accelerated to twice its original speed before entering the negative electrode rolling assembly 130. The included angle between the two negative electrode conveyor belts should be maintained between 20° and 60°. Regardless of whether single-path or dual-path laser cutting is used, it is necessary to ensure that the negative electrode unit sheet and the separator can enter the negative electrode rolling assembly 130 horizontally to complete the rolling and compounding of the negative electrode unit sheet and the separator by the negative electrode rolling assembly 130. For defective negative electrode sheets after cutting, feedback from the sensor can be obtained to complete the rejection of defective sheets before entering the negative electrode rolling assembly 130. To address the dust and waste generated by laser cutting, a zoned dust removal system will be adopted to prevent dust from circulating within the machine and increasing the risk of short circuits in the battery cells.

[0049] The negative electrode sheet line scan assembly 114 is positioned before the negative electrode laser tab cutting assembly 115. It is used to detect incoming material defects before entering the laser tab cutting 300. When the laser tab cutting 300 is performed, the tab 300 with this defective section will be skipped to ensure that each layer of tab 300 in the battery cell has a corresponding position. This avoids the line scan detecting defects after the tab 300 is cut. The negative electrode rejection assembly will reject the bad sheet, and the battery cell will have a missing sheet situation. If the bad sheet is not rejected, the entire battery cell will be scrapped.

[0050] The positive electrode material line mechanism 140 includes a positive electrode double unwinding roller group 141, a positive electrode laser-cut tab assembly 142, a V-angle punching assembly 143, a positive electrode drive assembly 144, a buffer assembly 145, a positive electrode tension swing arm 146, a positive electrode cutting assembly 147, and a positive electrode acceleration and waste removal assembly 148 arranged sequentially along the positive electrode material strip direction. The positive electrode double unwinding roller group 141 is used to unwind the positive electrode material strip. The positive electrode laser-cut tab assembly 142 is used to cut the tabs 300 of the positive electrode material strip. In addition, the V-angle punching assembly 143 is added to meet process requirements. The positive electrode drive assembly 144 is used to drive the positive electrode material strip to move. The buffer assembly 145 can buffer the positive electrode material strip. The positive electrode tension swing arm 146 can adjust the tension of the positive electrode material strip. The positive electrode cutting assembly 147 can cut the positive electrode material strip to form positive electrode unit sheets. The positive electrode acceleration and waste removal assembly 148 can realize the acceleration and waste removal of positive electrode unit sheets.

[0051] Furthermore, in this embodiment, the positive electrode material wire mechanism 140 can adopt a dual-path scheme. Both the upper and lower positive electrode material wires incorporate the tab-cutting 300 process, thus requiring the addition of components such as an embossing roller 113, an encoding roller, and a laser-cut tab-cutting 300 component. Metal cutting tools are used for punching on both the tab-cutting 300 side and the non-tab-cutting 300 side of the positive electrode material strip. The metal V-angle die and cutting blade are driven by a servo motor and a cam to achieve the opening and closing of the die, completing the cutting action. The punching tool should meet the requirement of having four rounded corners R1 at the blade tip, and a cut length and width of 1mm.

[0052] It should be noted that the positive electrode strip is still cut using a metal cutter to complete the slicing process, requiring precise control over the slicing accuracy and width. The positive electrode unit slices are fed at high speed and stably, with the cutter's feeding speed being half the diaphragm's conveyor belt speed. The system can collect and treat the dust generated during cutting, cleaning foreign objects from the electrode slices. When the cutter feeds the slices into the acceleration rollers, the electrode slices begin to accelerate, and after acceleration, the electrode slice speed becomes the same as the diaphragm speed. If an electrode slice is abnormal, it can be detected at the positive electrode alignment station, and the defective slice can be removed. The removed defective slice is then replaced by a replacement using the cutter and acceleration rollers.

[0053] In this embodiment, the negative electrode rolling assembly 130 includes two negative electrode rolling rollers 131 and a diaphragm drying oven 132. The negative electrode rolling rollers 131 can roll and composite the negative electrode unit sheet and the diaphragm, and the diaphragm drying oven 132 can bake the rolled negative electrode unit sheet and the diaphragm. The positive electrode composite assembly 150 includes two positive electrode composite rolling rollers, which can thermally composite the composite negative electrode unit sheet, the diaphragm, and the positive electrode unit sheet. After being heated in the diaphragm drying oven 132, the composite negative electrode unit sheet and the diaphragm enter the positive electrode accelerating roller and undergo thermal composite treatment with the alternately input upper and lower positive electrode unit sheets under the positive electrode rolling roller, thereby generating a composite sheet.

[0054] See Figure 3 In this embodiment, the tail material collection mechanism 180 includes a dual-drive assembly 181, a first hot electrode cutter 182, a second hot electrode cutter 183, and a tail material collection gripper 184. The dual-drive assembly 181 has a drive channel for the composite sheet to pass through. The first hot electrode cutter 182, the second hot electrode cutter 183, and the tail material collection gripper 184 are all disposed within the dual-drive assembly 181. The first hot electrode cutter 182 and the second hot electrode cutter 183 are spaced apart on one side of the drive channel and are used to cut the diaphragm tail material at the adhesive tape connection point on the composite sheet. The tail material collection gripper 184 is disposed between the first hot electrode cutter 182 and the second hot electrode cutter 183 and can extend into and out of the drive channel to collect the diaphragm tail material.

[0055] Furthermore, the dual-drive assembly 181 includes a dual-drive housing 185, a color mark detector 186, a first drive roller group 187, and a second drive roller group 188. The first drive roller group 187 and the second drive roller group 188 are spaced apart within the dual-drive housing 185 and form a drive channel. The color mark detector 186 is located on the feed side of the dual-drive housing 185 and is used to detect color marks on the composite sheet. The tail material collection gripper 184 is located between the first drive roller group 187 and the second drive roller group 188.

[0056] See Figure 4 The double unwinding diaphragm material line mechanism 120 includes a first diaphragm unwinding roller 121, a second diaphragm unwinding roller 122, an automatic diaphragm tape splicing platform 123, a diaphragm pressing platform 124, and a glue preparation platform 125. The automatic diaphragm tape splicing platform 123 is disposed between the first diaphragm unwinding roller 121 and the second diaphragm unwinding roller 122. The diaphragm pressing platform 124 is disposed on the automatic diaphragm tape splicing platform 123 and is used to press the connection of the diaphragm. The glue preparation platform 125 is provided with a tape rotating cylinder, which is used to adhere the connecting tape to the connection of the diaphragm.

[0057] The system employs a double unwinding method for the diaphragm, coupled with an automatic diaphragm rewinding mechanism. The unwinding and splicing modes for the same electrode are identical. Two diaphragm rolls can be placed in the unwinding area. During diaphragm rewinding, an automatic splicing method is used. An adhesive suction cup is used to fix the diaphragm to be connected, the old diaphragm strip is cut, and a rotary cylinder applies adhesive, completing the automatic rewinding and splicing action. Connecting tape remains at the diaphragm joint. The tail material collection mechanism 180's tail material collection claw 184 extends from behind the large plate, clamping the section of diaphragm with the connecting tape to process the tail material, reducing the time consumed during loading and unloading. For the tape left at the diaphragm rewinding splicing point, the negative electrode unit sheet does not need to be wrapped between the two diaphragm layers, and the positive electrode unit sheet is not adhered to the outer sides of the diaphragm. At the tail material collection mechanism 180, the rotating claw and cutting tool are used to collect the tail material of this section of diaphragm. The two composite sections are then bonded together, thus preventing the entire cell at the splicing point from being scrapped and avoiding material waste.

[0058] It should be noted that the tail material collection gripper 184, the first hot electrode cutter 182, and the second hot electrode cutter 183 are all located inside the dual-drive housing 185. When the color mark detector 186 detects the connecting tape at the diaphragm connector, the tail material collection gripper 184 extends, and the pressing platform below the gripper presses the composite material tape tightly. The second hot electrode cutter 183 below extends and cuts the composite sheet. Driven by the motor, the tail material collection gripper 184 begins to rotate, wrapping and removing the composite sheet to be discarded. The pressing platform above the gripper presses down on the composite sheet, and the first hot electrode cutter 182 above extends and cuts the composite sheet. At this time, the tail material collection gripper 184 retracts to the back of the large plate to unload the material. Meanwhile, the dual-drive assembly 181 begins to drive the composite sheet above, driving it into the dual-station stacking mechanism 190 for stacking to form a battery cell.

[0059] In this embodiment, the negative electrode unit, separator, and positive electrode unit are rolled by the positive electrode rolling roller to form a composite sheet. After being inspected by the inspection mechanism 160, the defective sheets that are detected need to be rejected. In order to avoid the defective sheets from sticking together with the separator and being difficult to remove when the cell is hot-pressed on the hot pressing table, adhesive is applied to the front and back sides (A and B sides) of the separator to ensure that the electrode sheets and the separator can be easily peeled off after the cell enters the hot pressing, and to facilitate semi-automatic sheet replacement, thereby improving the pass rate of the cell and increasing production efficiency.

[0060] See Figure 5In this embodiment, the offline patching mechanism 200 includes a unit wafer hopper 210, an NG cell hopper 220, a cell patching assembly 230, a cell hot pressing assembly 240, and an adhesive application platform 250 arranged sequentially. The unit wafer hopper 210 stores unit wafers for patching. The NG cell hopper 220 stores NG cells stacked by the dual-station stacking mechanism 190. The cell patching assembly 230 unfolds the NG cells and performs patching. The cell hot pressing assembly 240 hot presses the patched NG cells. The adhesive application platform 250 applies adhesive to the hot-pressed NG cells to form qualified cells. Specifically, after inspection by mechanisms such as composite wafer line scanning, unit wafer short circuit detection, and tab 300 damage detection, adhesive is applied to the AB side of the diaphragm. After stacking and hot pressing, unqualified cells are determined to be NG and placed on the NG cell placement platform. After transfer, the NG cells are placed on the NG cell box 220 of the offline patching mechanism 200. The cell patching assembly 230 has three alignment platforms. After removing the adhesive tape from the A and B sides of the separator, the cell is unfolded. The three alignment platforms are, in order, normal cells, defective cells, and normal cells. The middle alignment platform is cut by two thermal separator cutters, and then the defective cells are removed by a suction tray. For defective cells, there are three electrode replacement platforms for replacing the upper positive electrode + negative electrode, the negative electrode + lower positive electrode, and the negative electrode (tail). The cells are then detected and positioned by eight CCD cameras. The two corners of the large blank space on the left side of the first alignment platform, the four corners of the large blank space on the second alignment platform, and the two corners of the large blank space on the right side of the third alignment platform are located. After positioning by a vision camera, the alignment platforms are adjusted by CCD positioning feedback. After positioning, the electrode to be replaced is picked up by a suction tray and aligned and pasted. At this point, the offline patching mechanism 200 has completed its work. When multiple electrodes of the same battery cell need to be replaced, the above steps can be repeated. After patching, the battery cell undergoes hot pressing, short-circuit testing, and adhesive bonding to form a new, qualified battery cell.

[0061] Furthermore, the offline patching mechanism 200 also includes a transfer track 260, a transfer robot 270, a hot-press loading robot 280, and a hot-press unloading robot 290. The transfer robot 270 is slidably mounted on the transfer track 260 and can move between the unit cell material bin 210, the NG cell material box 220, and the cell patching assembly 230 to realize material transfer. The hot-press unloading robot 290 and the hot-press loading robot 280 are both mounted on the transfer track 260, and the hot-press loading robot 280 is located between the cell patching assembly 230 and the cell hot-pressing assembly 240 to deliver the patched NG cells to the cell hot-pressing assembly 240. The hot-press unloading robot 290 is located between the cell patching assembly 230 and the adhesive application platform 250 to deliver the hot-pressed NG cells to the adhesive application platform 250.

[0062] See Figure 1 In this embodiment, the testing mechanism 160 includes a composite sheet testing component 161 and a short-circuit testing component 162. The composite sheet testing component 161 is disposed on the discharge side of the positive electrode composite component 150 and is used to detect the height of the tab 300 on the composite sheet. The short-circuit testing component 162 is disposed on the side of the composite sheet testing component 161 away from the positive electrode composite component 150 and is used to perform short-circuit testing on the positive electrode unit and the negative electrode unit on the composite sheet.

[0063] See Figure 6 The short-circuit test assembly 162 includes a linear motor 163 and a four-position short-circuit detection pressure block 164. The linear motor 163 is connected to the four-position short-circuit detection pressure block 164 for driving the four-position short-circuit detection pressure block 164 to move synchronously with the composite sheet and press it onto the tab 300 of the composite sheet for short-circuit testing. After the composite sheet detection assembly 161 detects the height of the tab 300 of the composite sheet, the tabs need to be short-circuited. That is, during the material conveyor belt movement, the linear motor 163 is used to accelerate, and the upper and lower short-circuit test pressure plates clamp the positive and negative tabs to perform short-circuit testing on the composite material conveyor belt. The testing method adopts a chasing clamping method and can simultaneously test multiple pairs of unit sheets online. It can use the linear motor 163 to perform four-position chasing clamping testing, and the detection of the tabs is completed by the acceleration and deceleration of the linear motor 163.

[0064] See Figure 7 In other preferred embodiments of the present invention, the short-circuit test assembly 162 includes a synchronous pulley 165, a synchronous belt 166, and a plurality of short-circuit detection blocks 167. The synchronous belt 166 is wound around the synchronous pulley 165, and the plurality of short-circuit detection blocks 167 are disposed on the synchronous belt 166. The synchronous pulley 165 is used to drive the synchronous belt 166 to move, so that one side of the synchronous belt 166 moves synchronously with the composite sheet. The short-circuit detection blocks 167 are used to contact the tabs 300 on the composite sheet and perform short-circuit testing. Specifically, the belt synchronous pulley 165 mechanism is used for testing. There are multiple testing stations on the belt, and a testing belt line cooperates with a support belt line to perform short-circuit testing on the electrode sheet.

[0065] See Figure 8In this embodiment, the composite sheet detection component 161 includes a front camera 1611, a back camera 1612, a front light source 1613, a back ring light source 1614, a front ring light source 1615, and a back light source 1616. The front camera 1611 is spaced apart on the front side of the composite sheet. The front ring light source 1615 is disposed between the front camera 1611 and the composite sheet. The back light source 1616 is disposed on the side of the composite sheet away from the front ring light source 1615. The back camera 1612 is disposed on the back side of the composite sheet and is offset from the front camera 1611. The back ring light source 1614 is disposed between the composite sheet and the back camera 1612. The front light source 1613 is disposed on the side of the composite sheet away from the back ring light source 1614.

[0066] The composite sheet tension system consists of a tension swing arm mechanism, a tension drive mechanism, a tension detection mechanism 160, and a composite sheet conveyor roller. After the positive electrode composite pressing roller, there are two sets of tension swing arm mechanisms. Between these two sets are tension drive and tension detection components. The tension of the first set of tension swing arms, closer to the composite pressing roller, is 10% to 20% greater than that of the second set. The tension drive component between the two sets of tension swing arm mechanisms is used to interrupt the tension, thus providing tension for the composite sheet while simultaneously addressing issues such as strip misalignment and insufficient strip buffering. Unlike the composite sheet tension system, tension swing arm components also exist on the electrode and diaphragm strips. However, while both provide tension and address strip misalignment, the tension swing arm components on the electrode and diaphragm strips do not provide a buffering function.

[0067] Before the composite sheet enters the dual-station stacking mechanism 190, it needs to pass through the dual-drive assembly 181. The dual-drive assembly 181 is required to have composite sheet driving function, and cooperate with the diaphragm tracking and cutting assembly and the dual-station stacking mechanism 190 to realize the composite sheet driving and conveying functions. The stacking mechanism is required to have the functions of first sheet correction, alignment detection, electrode wrapping detection, electrode smoothing, and compatible stacking. The alignment accuracy of adjacent electrode sheets is required to be ≤±0.3mm, and the overall cell alignment accuracy is required to be ≤±0.4mm.

[0068] In this embodiment, the dual-station stacking mechanism 190 can fulfill functions such as first sheet correction, alignment detection, electrode coating detection, electrode smoothing, and compatible stacking. Specifically, when the stacking platform falls, the baffle of the stacking platform is driven by a motor to follow the falling position of the composite sheet, so as to avoid the edge of the composite sheet hitting the baffle and causing damage during high-speed falling.

[0069] This invention adds components such as an embossing roller 113, a laser-cut electrode tab 300, and a laser cutter to the original thermal lamination machine, resulting in higher efficiency. The negative electrode sheet line scanning station is positioned before the laser-cut electrode tab 300 to detect defects on the incoming material surface, preventing defects from being detected after the laser-cut electrode tab 300 and thus discarding the electrode sheet in the negative electrode rejection assembly, which would lead to missing cells. A double unwinding diaphragm system, an automatic tape splicing mechanism, and a tail material collection mechanism 180 are employed. The diaphragm unwinding method is changed to double unwinding with an automatic tape splicing mechanism. At the tape connection point during roll changes, the tail material collection mechanism 180 removes the diaphragm, preventing the tape connection from affecting the cell and avoiding the complete scrapping of the cell, thus preventing material waste. Simultaneously employing a double-sided adhesive bonding and automatic replacement scheme, adhesive is applied between the separators of the detected defective composite sheets. During hot pressing in a four-layer hot press, the positive electrode sheet and separator do not excessively adhere. The defective sheets are then replaced on a semi-automatic replacement mechanism, resulting in qualified cells. A short-circuit tracking and testing component is located after the composite sheet line scan detection mechanism 160, used to detect whether the composite sheet unit cells are short-circuited. A linear motor 163 is used for tracking and clamping detection, simultaneously detecting short circuits in four composite sheet unit cells.

[0070] In summary, this embodiment of the invention utilizes the negative electrode feed line mechanism 110 and the positive electrode feed line mechanism 140 to respectively transport the negative electrode unit sheet and the positive electrode unit sheet. Simultaneously, a double unwinding diaphragm feed line mechanism 120 provides a continuous diaphragm, and color-coded connecting tape is affixed to the diaphragm joints. The negative electrode rolling assembly 130 can roll and composite the diaphragm and negative electrode unit sheet, while the positive electrode composite assembly 150 can thermally composite the positive electrode unit sheet with the rolled and composited diaphragm and negative electrode unit sheet to form a composite sheet. The composite sheet is inspected by the detection mechanism 160 to identify NG sheets, and then the double-sided adhesive applicator 170 applies adhesive to form an anti-sticking layer. The tail material collection mechanism 180 collects the diaphragm tail material at the connecting tape, thereby preventing the tape connection from affecting the battery cell, avoiding the complete scrapping of the battery cell, and preventing material waste. Because of the anti-sticking layer, the offline patching mechanism 200 can re-unfold and patch the NG cells formed after stacking, enabling online detection and offline patching. This allows for timely patching of defective products, improving the yield rate of cells and increasing production efficiency.

[0071] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A composite laser cutting and stacking integrated machine, characterized in that, include: A negative electrode material wire mechanism is used to provide negative electrode material strips and cut the negative electrode material strips into negative electrode unit sheets; A double unwinding diaphragm production line mechanism is used to provide continuous diaphragms, and the joints of the diaphragms are provided with connecting tape with color marks; A negative electrode rolling assembly is disposed on the discharge side of the negative electrode feed line mechanism and the diaphragm feed line mechanism, and is used to roll and combine the diaphragm and the negative electrode unit sheet; A positive electrode material wire mechanism is used to provide positive electrode material strips and cut the positive electrode material strips into positive electrode unit sheets; A positive electrode composite assembly is disposed on the discharge side of the positive electrode feed line mechanism and the negative electrode rolling assembly, and is used to thermally composite the positive electrode unit sheet, the separator and the negative electrode unit sheet to form a composite sheet; The testing mechanism is located on the discharge side of the positive electrode composite assembly and is used to test the composite sheet. A double-sided adhesive applicator is provided on the discharge side of the testing mechanism to apply adhesive to both sides of the defective electrode portion in the composite sheet and form an anti-sticking adhesive layer. A tail material collection mechanism is provided on the discharge side of the double-sided adhesive bonding mechanism to collect the diaphragm tail material at the connecting tape on the composite sheet; A dual-station stacking mechanism is provided on the discharge side of the tail material collection mechanism for stacking the composite sheets to form a battery cell. An offline patching mechanism is located on the discharge side of the dual-station stacking mechanism and is used to patch NG cells during unfolding.

2. The composite laser cutting and stacking integrated machine according to claim 1, characterized in that, The tailings collection mechanism includes a dual-drive assembly, a first hot electrode cutter, a second hot electrode cutter, and a tailings collection gripper. The dual-drive assembly has a drive channel for the composite sheet to pass through. The first hot electrode cutter, the second hot electrode cutter, and the tailings collection gripper are all disposed within the dual-drive assembly. The first hot electrode cutter and the second hot electrode cutter are spaced apart on one side of the drive channel to cut the diaphragm tailings at the connecting tape on the composite sheet. The tailings collection gripper is disposed between the first hot electrode cutter and the second hot electrode cutter and can extend into and out of the drive channel to collect the diaphragm tailings.

3. The composite laser cutting and stacking integrated machine according to claim 2, characterized in that, The dual-drive assembly includes a dual-drive housing, a color mark detector, a first drive roller group, and a second drive roller group. The first drive roller group and the second drive roller group are spaced apart in the dual-drive housing and form the drive channel. The color mark detector is located on the feed side of the dual-drive housing and is used to detect color marks on the composite sheet. The tail material collection gripper is located between the first drive roller group and the second drive roller group.

4. The composite laser cutting and stacking integrated machine according to claim 1, characterized in that, The offline patching mechanism includes a unit wafer hopper, an NG cell cassette, a cell patching assembly, a cell hot pressing assembly, and an adhesive application platform arranged sequentially. The unit wafer hopper stores unit wafers for patching. The NG cell cassette stores NG cells stacked by the dual-station stacking mechanism. The cell patching assembly unfolds the NG cells and performs patching. The cell hot pressing assembly hot-presses the patched NG cells. The adhesive application platform applies adhesive to the hot-pressed NG cells to form qualified cells.

5. The composite laser cutting and stacking integrated machine according to claim 4, characterized in that, The offline patching mechanism further includes a transfer track, a transfer robot, a hot-press loading robot, and a hot-press unloading robot. The transfer robot is slidably mounted on the transfer track and can move between the unit cell material bin, the NG cell material box, and the cell patching assembly to achieve material transfer. The hot-press unloading robot and the hot-press loading robot are both mounted on the transfer track, and the hot-press loading robot is positioned between the cell patching assembly and the cell hot-pressing assembly to deliver the patched NG cell to the cell hot-pressing assembly. The hot-press unloading robot is positioned between the cell patching assembly and the adhesive application platform to deliver the hot-pressed NG cell to the adhesive application platform.

6. The composite laser cutting and stacking integrated machine according to claim 1, characterized in that, The dual unwinding diaphragm production line mechanism includes a first diaphragm unwinding roller, a second diaphragm unwinding roller, an automatic diaphragm splicing platform, a diaphragm pressing platform, and a glue preparation platform. The automatic diaphragm splicing platform is located between the first diaphragm unwinding roller and the second diaphragm unwinding roller. The diaphragm pressing platform is located on the automatic diaphragm splicing platform and is used to press the connection point of the diaphragm. The glue preparation platform is equipped with a tape rotating cylinder, which is used to adhere the connecting tape to the connection point of the diaphragm.

7. The composite laser cutting and stacking integrated machine according to claim 1, characterized in that, The testing mechanism includes a composite sheet testing component and a short-circuit testing component. The composite sheet testing component is located on the discharge side of the positive electrode composite component and is used to detect the tab height of the composite sheet. The short-circuit testing component is located on the side of the composite sheet testing component away from the positive electrode composite component and is used to perform short-circuit tests on the positive electrode unit and negative electrode unit on the composite sheet.

8. The composite laser cutting and stacking integrated machine according to claim 7, characterized in that, The short-circuit test assembly includes a linear motor and a four-position short-circuit detection pressure block. The linear motor is connected to the four-position short-circuit detection pressure block for driving the four-position short-circuit detection pressure block to move synchronously with the composite sheet and press it onto the tabs of the composite sheet to perform a short-circuit test.

9. The composite laser cutting and stacking integrated machine according to claim 7, characterized in that, The short-circuit test assembly includes a synchronous pulley, a synchronous belt, and multiple short-circuit detection blocks. The synchronous belt is wound around the synchronous pulley, and the multiple short-circuit detection blocks are disposed on the synchronous belt. The synchronous pulley is used to drive the synchronous belt to move so that one side of the synchronous belt moves synchronously with the composite sheet. The short-circuit detection blocks are used to contact the tabs on the composite sheet and perform short-circuit tests.

10. The composite laser cutting and stacking integrated machine according to claim 7, characterized in that, The composite sheet detection assembly includes a front camera, a back camera, a front light source, a back ring light source, a front ring light source, and a back light source. The front cameras are spaced apart on the front side of the composite sheet. The front ring light source is positioned between the front cameras and the composite sheet. The back light source is positioned on the side of the composite sheet away from the front ring light source. The back camera is positioned on the back side of the composite sheet and is offset from the front cameras. The back ring light source is positioned between the composite sheet and the back camera. The front light source is positioned on the side of the composite sheet away from the back ring light source.

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