Composite pole strip folding apparatus and folding process

Abstract

The application belongs to the technical field of batteries, and particularly relates to a composite electrode strip folding device and a folding process. The composite electrode strip folding device is used for folding a composite electrode strip. The composite electrode strip folding device comprises a machine body and a controller. A first conveying roller, a second conveying roller, a third conveying roller and a fourth conveying roller are rotatably connected to one side of the machine body. A rotary driving device is installed on the machine body and is in driving connection with the first conveying roller, the second conveying roller, the third conveying roller and the fourth conveying roller. The first conveying roller, the second conveying roller, the third conveying roller and the fourth conveying roller are independently driven by the rotary driving device. The controller is in electrical connection with the rotary driving device. The application can replace the electrode strip cutting and folding process. The electrode strip no longer needs a punching process in the manufacture of the battery cell, so that burrs caused by punching are reduced. The application can continuously and rapidly operate, and the production efficiency of the laminated battery is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of batteries, and in particular relates to a composite pole piece strip folding device and a folding process. Background Art

[0002] In the new energy battery industry, there are currently two manufacturing processes for battery cells: winding and lamination;

[0003] Among them, when the battery cells are produced by winding, the production efficiency is high and the cost is low, but the space utilization rate is low when the PACK is grouped, and the battery pack capacity of the same volume is not as good as the laminated battery;

[0004] Although the space utilization rate of the laminated battery is high, during the production of the laminated battery, the composite electrode strip needs to be punched out first through a punching process, and then the punched composite electrode sheets are stacked together and the stacked composite electrode sheets are positioned. This is affected by hardware problems such as mechanical speed and positioning accuracy, resulting in low production efficiency. Summary of the Invention

[0005] The purpose of the present invention is to provide a composite electrode strip folding device and folding process, which can replace the electrode cutting and stacking process. In the manufacture of battery cells, the electrode no longer requires a punching process, the burrs caused by punching are reduced, and it can operate continuously at high speed, thereby improving the production efficiency of laminated batteries.

[0006] The technical solutions adopted by the present invention are as follows:

[0007] A composite electrode strip folding device includes a body and a controller, wherein one side of the body is rotatably connected to a first conveying roller, a second conveying roller, a third conveying roller, and a fourth conveying roller, and a rotary drive device is mounted on the body and is in transmission connection with the first conveying roller, the second conveying roller, the third conveying roller, and the fourth conveying roller, and the first conveying roller, the second conveying roller, the third conveying roller, and the fourth conveying roller are independently driven by the rotary drive device, and the controller is electrically connected to the rotary drive device;

[0008] The second conveying roller is located at the lower side of the first conveying roller, the third conveying roller is located in front of the second conveying roller, and the fourth conveying roller is located at the lower side of the third conveying roller;

[0009] One side of the machine body is equipped with a downward pressure applying mechanism located on the upper side of the third conveying roller, and one side of the machine body is equipped with a side pressure applying mechanism located on the lower side of the second conveying roller;

[0010] A first guide mechanism and a plurality of second guide mechanisms are installed on one side of the machine body. The first guide mechanism is located above the third conveying roller. The first guide mechanism is provided with a first guide groove with a rear opening. The rear end of the first guide groove is inclined downward.

[0011] The second guide mechanism is located at the rear side of the fourth conveying roller. A second guide groove with a front opening is provided on the second guide mechanism. The front end of the second guide groove is inclined upward.

[0012] Furthermore, one side of the machine body is also rotatably connected to at least one first relay transmission roller and at least one second relay transmission roller, the first relay transmission roller and the second relay transmission roller are both transmission-connected to the rotary drive device, the number of the first relay transmission roller and the second relay transmission roller is the same, one first relay transmission roller and one second relay transmission roller constitute a transmission group, and the multiple transmission groups are arranged in order from top to bottom, the first relay transmission roller in the same transmission group is located on the upper side of the second relay transmission roller, the first relay transmission roller in the first transmission group is located in front of the fourth transmission roller, and the first relay transmission roller in the next transmission group is located in front of the second relay transmission roller in the previous transmission group;

[0013] A downward pressure applying mechanism is also provided on one side of the machine body and located above the first relay conveying roller;

[0014] One side of the machine body is equipped with a side pressure applying mechanism located at the rear side of the second relay conveying roller;

[0015] A first guide mechanism is installed on one side of the machine body and located above the first relay conveying roller;

[0016] A second guide mechanism is installed on one side of the machine body and at the rear side of the second relay transmission roller.

[0017] Furthermore, the downward pressure applying mechanism includes an upper air knife fixedly connected to one side of the machine body, the upper air knife is located on the rear side of the first guide mechanism, and a lower air outlet is opened on the lower side of the upper air knife;

[0018] The side pressure applying mechanism includes a side wind knife fixedly connected to one side of the machine body, the second guide mechanism is located at the lower side of the side wind knife, and a side air outlet is opened on the front side of the side wind knife of the side pressure applying mechanism.

[0019] Furthermore, the first guide groove and the second guide groove are both fixedly connected to positions away from the openings thereof with position sensors electrically connected to the controller.

[0020] Furthermore, the first guide mechanism includes an upper transport belt group and a lower transport belt group fixedly connected to one side of the machine body, the upper transport belt group and the lower transport belt group are both electrically connected to the controller, the lower transport belt group is located below the upper transport belt group, and the first guide groove is the space between the upper transport belt group and the lower transport belt group of the first guide mechanism;

[0021] The second guide mechanism includes an upper conveying belt set and a lower conveying belt set fixedly connected to one side of the body, the upper conveying belt set and the lower conveying belt set are electrically connected with the controller, the lower conveying belt set is located below the upper conveying belt set, and the first guide groove is a space between the upper conveying belt set and the lower conveying belt set of the first guide mechanism.

[0022] Further, a rotating rod is rotatably connected to one side of the body and located at the rear end of the lower conveying belt set of the first guide mechanism, a flow guide plate is fixedly connected to the front side of the rotating rod, and a servo motor electrically connected with the controller is fixedly connected to the body.

[0023] Further, a moving mechanism is fixedly connected to one side of the body and located below the lower conveying belt set, a lower air knife with an initial position below the lower conveying belt set is fixedly connected to the moving mechanism, an upper air outlet is formed in the upper side of the lower air knife, and the moving mechanism can drive the lower air knife to move to the rear end of the flow guide plate.

[0024] Further, a plurality of CCD monitors electrically connected with the controller are fixedly connected to one side of the body, and the plurality of CCD monitors are respectively located above the first guide mechanism and the second guide mechanism.

[0025] Further, a cutter, a traction mechanism, a deviation rectifying mechanism and a tape flying mechanism are further assembled to one side of the body and located at the rear side of the first conveying roller and the second conveying roller.

[0026] A composite tab belt folding process, comprising the following steps:

[0027] Step 1: Place the composite tab belt body between the first conveying roller and the second conveying roller, start the rotating drive device to drive the first conveying roller and the second conveying roller to rotate, let the composite tab pass through the roller gap between the first conveying roller and the second conveying roller, until the composite tab belt body enters the first guide groove;

[0028] Step 2: Start the downward pressure applying mechanism to apply downward pressure to the composite tab, so that the composite tab belt body is squeezed into the roller gap between the second conveying roller and the third conveying roller;

[0029] Step 3: Start the rotating drive device to drive the second conveying roller and the third conveying roller to rotate, let the two-layer composite composite tab pass through the roller gap between the second conveying roller and the third conveying roller, until the two-layer composite composite tab belt body enters the first guide groove, completing the first folding of the composite tab belt body;

[0030] Step 4: Start the side pressure applying mechanism to apply side pressure to the composite electrode piece, so that the composite electrode piece strip is squeezed into the roller gap between the third conveying roller and the fourth conveying roller;

[0031] Step 5: Start the rotary drive device to drive the third and fourth conveyor rollers to rotate, allowing the three-layer composite electrode to pass through the roller gap between the third and fourth conveyor rollers until the three-layer composite electrode strip enters the first guide groove, completing the secondary bending of the composite electrode strip.

[0032] The technical effects achieved by the present invention are:

[0033] The composite electrode strip folding device and folding process of the present invention replace the electrode cutting and stacking process. The cutting and stacking process requires the positive and negative electrode sheets to be punched into fixed lengths in advance. Burrs are easily generated during the punching process. During the stacking process, it is affected by the movement, grasping and positioning of the robot, and continuous high-speed stacking cannot be achieved, resulting in low production efficiency. The present invention no longer requires a punching process for the electrode in battery cell manufacturing. During the folding process of the present invention, the equipment can operate continuously at high speed, and reduce burrs caused by punching, thereby improving the production efficiency of laminated batteries. It is significantly superior to the cutting and stacking process in terms of quality control, production efficiency and cost control. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a structural schematic diagram of the present invention;

[0035] Figure 2 It is a front view of the structure of the present invention;

[0036] Figure 3 It is a rotation direction diagram of the conveying roller of the present invention;

[0037] Figure 4 This is a structural front view of the guide mechanism of the present invention;

[0038] Figure 5 It is a structural schematic diagram of step 1 of the present invention;

[0039] Figure 6 It is a structural schematic diagram of step 2 of the present invention;

[0040] Figure 7 It is a schematic diagram of the structure of the composite pole piece strip after folding of the present invention.

[0041] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0042] 1. Machine body; 2. First conveying roller; 3. Second conveying roller; 4. Third conveying roller; 5. Fourth conveying roller; 6. Upper conveying belt group; 7. Lower conveying belt group; 8. Position sensor; 9. Guide plate; 10. Upper wind knife; 11. Lower wind knife; 12. Side wind knife; 13. CCD monitoring; 14. Composite electrode belt (14); 15. Moving mechanism; 16. First relay conveying roller; 17. Second relay conveying roller. DETAILED DESCRIPTION

[0043] In order to make the purpose and advantages of the present invention more clearly understood, the present invention is described in detail below with reference to the following examples. It should be understood that the following text is only used to describe one or more specific embodiments of the present invention and does not strictly limit the scope of protection of the present invention.

[0044] like Figure 1-7 As shown, a composite electrode strip folding device includes a body 1 and a controller, one side of the body 1 is rotatably connected to the first conveying roller 2, the second conveying roller 3, the third conveying roller 4 and the fourth conveying roller 5, and a rotating drive device is installed on the body 1 that is transmission-connected to the first conveying roller 2, the second conveying roller 3, the third conveying roller 4 and the fourth conveying roller 5, and the first conveying roller 2, the second conveying roller 3, the third conveying roller 4 and the fourth conveying roller 5 are all independently driven by the rotating drive device, and the controller is electrically connected to the rotating drive device. At this time, the user can drive any number of the first conveying roller 2, the second conveying roller 3, the third conveying roller 4 and the fourth conveying roller 5 to rotate clockwise or counterclockwise according to process requirements, and can drive two or more of the first conveying roller 2, the second conveying roller 3, the third conveying roller 4 and the fourth conveying roller 5 to rotate clockwise or counterclockwise respectively.

[0045] Here, the working function of the rotary drive device is to independently drive the first conveying roller 2, the second conveying roller 3, the third conveying roller 4, and the fourth conveying roller 5. All devices that can achieve this function can be a rotary drive device. In order to more clearly describe the rotary drive device in this technical solution, the structure of the rotary drive device is disclosed here;

[0046] One structure of the rotary drive device can be that the rotary drive device includes multiple servo motors fixedly connected to the body 1, and the output ends of the multiple servo motors are respectively fixedly connected to the first conveying roller 2, the second conveying roller 3, the third conveying roller 4, and the fourth conveying roller 5. By starting the servo motors, the conveying rollers can be driven to rotate clockwise or counterclockwise.

[0047] Similarly, another structure of the rotary driving device can be that the rotary driving device comprises a plurality of pneumatic motors, the output ends of the plurality of pneumatic motors are fixedly connected with the first conveying roller 2, the second conveying roller 3, the third conveying roller 4 and the fourth conveying roller 5 respectively, and the conveying rollers can be driven to rotate clockwise or counterclockwise by starting the servo motor.

[0048] As shown in Figure 1 and Figure 4 , the second conveying roller 3 is located below the first conveying roller 2, the third conveying roller 4 is located in front of the second conveying roller 3, the fourth conveying roller 5 is located below the third conveying roller 4, the roll gap width between the first conveying roller 2 and the second conveying roller 3 is less than the thickness of the composite tab belt 14, the thickness of the composite tab belt 14 can be the thickness of the positive tab + the thickness of the negative tab + the thickness of the separator * 3, the roll gap width between the second conveying roller 3 and the third conveying roller 4 is less than the thickness of two composite tab belts 14, the roll gap width between the third conveying roller 4 and the fourth conveying roller 5 is less than the thickness of three composite tab belts 14, and the roll gap widths of the plurality of roll gaps increase by one thickness of the composite tab belt 14 in order from top to bottom.

[0049] As shown in Figure 4-6 , when the composite tab belt 14 passes through the roll gap, it is pushed by the extrusion between the first conveying roller 2 and the second conveying roller 3, so that the rotating first conveying roller 2 and the second conveying roller 3 drive the composite tab belt 14 to move forward until the composite tab belt 14 moves to the upper side of the third conveying roller 4.

[0050] As shown in Figure 4-6 , one side of the machine body 1 is equipped with a downward pressure applying mechanism located on the upper side of the third conveying roller 4, when the composite tab belt 14 moves to the upper side of the third conveying roller 4, the downward pressure applying mechanism can drive the composite tab belt 14 to move downward, so that the lower side of the composite tab belt 14 fully adheres to the third conveying roller 4, and a bend is formed at the position of the composite tab belt 14 under the downward pressure. At this time, the third conveying roller 4 is driven to rotate clockwise by the rotary driving device, so that the bent composite tab belt 14 is driven to move by the second conveying roller 3 and the third conveying roller 4, and the composite tab belt 14 between the second conveying roller 3 and the third conveying roller 4 is bent once to form two laminated tab segments.

[0051] As shown in Figure 4-6As shown, one side of the machine body 1 is equipped with a side pressure applying mechanism located on the lower side of the second conveyor roller 3. When the laminated segment after one bending moves down to the side of the fourth conveyor roller 5, and the connection between the laminated segment and the subsequent composite electrode sheet strip 14 is opposite to the roller gap between the third conveyor roller 4 and the fourth conveyor roller 5, the side pressure applying mechanism can be used to drive the composite electrode sheet strip 14 to move toward the side close to the third conveyor roller 4 and the fourth conveyor roller 5, so that the subsequent composite electrode sheet strip 14 and the third conveyor roller 4 are fully fitted, so that the laminated segment and the fourth conveyor roller 5 are fully fitted, and a bend is formed at the connection between the laminated segment and the subsequent composite electrode sheet strip 14. At this time, the fourth conveyor roller 5 is driven by the rotary drive device to rotate counterclockwise, so that the bent laminated segment and the subsequent composite electrode sheet strip 14 can be driven by the third conveyor roller 4 and the fourth conveyor roller 5 to move, and the laminated segment and the subsequent composite electrode sheet strip 14 passing through the roller gap between the third conveyor roller 4 and the fourth conveyor roller 5 complete one bending to form three laminated segments combined together.

[0052] Here, the subsequent composite electrode strip 14 is an unfolded portion.

[0053] Further, such as Figure 1-3 As shown, in order to be able to fold the subsequent composite electrode strip 14 more times, one side of the body 1 can also be rotatably connected to at least one first relay transmission roller 16 and at least one second relay transmission roller 17. The first relay transmission roller 16 and the second relay transmission roller 17 are both connected to the rotary drive device by transmission, and can be driven by an independent servo motor or hydraulic motor to drive the first relay transmission roller 16 and the second relay transmission roller 17 to rotate. The number of the first relay transmission roller 16 and the second relay transmission roller 17 is the same, and one first relay transmission roller 16 and one second relay transmission roller 17 are connected to each other by transmission. The second relay transmission rollers 17 constitute a transmission group, and the multiple transmission groups are arranged in sequence from top to bottom. The first relay transmission roller 16 in the same transmission group is located on the upper side of the second relay transmission roller 17, the first relay transmission roller 16 in the first transmission group is located in front of the fourth transmission roller 5, and the first relay transmission roller 16 in the next transmission group is located in front of the second relay transmission roller 17 in the previous transmission group, so that the subsequent composite electrode strip 14 can be folded by the rotation of the first relay transmission roller 16 and the second relay transmission roller 17.

[0054] In order to enable the subsequent composite pole piece belt 14 to fully adhere to the first relay conveying roller 16 and the second relay conveying roller 17, one side of the machine body 1 and the upper side of the first relay conveying roller 16 are also provided with a downward pressure applying mechanism. When the laminated piece moves to the upper side of the first relay conveying roller 16, the downward pressure applying mechanism can drive the laminated piece and the composite pole piece belt 14 to move downward, so that the lower side of the laminated piece fully adheres to the first relay conveying roller 16, and a bend is formed at the connection between the laminated piece and the subsequent composite pole piece belt 14. At this time, the first relay conveying roller 16 is driven to rotate clockwise by the rotating driving device, so that the laminated piece and the subsequent composite pole piece belt 14 after bending are moved by the first relay conveying roller 16, and the laminated piece and the subsequent composite pole piece belt 14 are bent again.

[0055] As shown in Figure 4-6 One side of the machine body 1 is provided with a side pressure applying mechanism located at the rear side of the second relay conveying roller 17. When the laminated piece moves downward to one side of the second relay conveying roller 17, and the connection between the laminated piece and the subsequent composite pole piece belt 14 is opposite to the roller gap between the first relay conveying roller 16 and the second relay conveying roller 17, the side pressure applying mechanism can drive the composite pole piece belt 14 to move to the side close to the first relay conveying roller 16 and the second relay conveying roller 17, so that the laminated piece fully adheres to the second relay conveying roller 17, and a bend is formed at the connection between the laminated piece and the subsequent composite pole piece belt 14. At this time, the lower conveying belt group 7 is driven to rotate counterclockwise by the rotating driving device, so that the laminated piece and the subsequent composite pole piece belt 14 after bending are moved by the first relay conveying roller 16 and the second relay conveying roller 17, and the laminated piece and the subsequent composite pole piece belt 14 complete the bending again through the roller gap between the first relay conveying roller 16 and the second relay conveying roller 17.

[0056] As shown in Figure 2-3 The downward pressure applying mechanism and the side pressure applying mechanism are pressure applying mechanisms, which can be a combination of air knives or air cylinder shafts;

[0057] When the downward pressure applying mechanism and the side pressure applying mechanism are air knives, the downward pressure applying mechanism includes an upper air knife 10 fixedly connected to one side of the machine body 1. The upper air knife 10 is connected with a fan or an air pump, and the lower side of the upper air knife 10 is provided with a lower air outlet. When the upper air knife 10 is in wind, the wind force is discharged to the upper side of the composite pole piece belt 14 through the lower air outlet, so as to apply downward pressure to the composite pole piece belt 14 from the upper side of the composite pole piece belt 14;

[0058] The side pressure applying mechanism includes a side wind knife 12 fixedly connected to one side of the body 1, and the side wind knife 12 is connected to a fan or an air pump. A side air outlet is provided on the front side of the side wind knife 12 of the side pressure applying mechanism. When the side wind knife 12 takes in air, the wind is discharged through the side air outlet to the rear side of the composite electrode strip 14, and side pressure is applied to the composite electrode strip 14 from the rear side of the composite electrode strip 14.

[0059] Since the wind knife applies pressure to the composite pole piece strip 14 through the airflow, the friction force added to the composite pole piece strip 14 is small, and the impact on the movement of the composite pole piece strip 14 is small.

[0060] Among them, the downward pressure applying mechanism and the side pressure applying mechanism are a combination of a cylinder shaft, and the downward pressure applying mechanism and the side pressure applying mechanism both include a cylinder fixedly connected to one side of the body 1, and the piston rod of the cylinder is rotatably connected to the shaft. At this time, the shaft can be driven to move by starting the cylinder. When the shaft and the composite pole piece strip 14 are against each other, pressure can be applied to the composite pole piece strip 14, and the friction resistance encountered by the composite pole piece strip 14 when moving can be reduced by the rotation of the shaft.

[0061] At the same time, if Figure 2-3 As shown, in order to guide the composite electrode strip 14, one side of the body 1 is equipped with multiple first guide mechanisms and multiple second guide mechanisms. The multiple first guide mechanisms are respectively located on the upper side of the third conveying roller 4 and the first relay conveying roller 16. The upper wind knife 10 is located on the rear side of the first guide mechanism. The first guide mechanism is provided with a first guide groove with a rear opening. The rear end of the first guide groove is inclined downward. At this time, when the composite electrode strip 14 passes through the roller groove between the first conveying roller 2 and the second conveying roller 3 or between the third conveying roller 4 and the fourth conveying roller 5 or between the first relay conveying roller 16 and the second relay conveying roller 17 and moves out, it will enter the interior of the first guide groove through the opening of the first guide groove, and the composite electrode strip 14 is guided by the first guide groove.

[0062] Further, such as Figure 2-3 As shown, multiple second guide mechanisms are respectively located on the rear side of the fourth conveyor roller 5 and the second relay conveyor roller 17, the second guide mechanism is located on the lower side of the side wind knife 12, and the second guide mechanism is provided with a second guide groove with a front opening. The front end of the second guide groove is inclined upward. At this time, when the composite electrode strip 14 passes through the roller groove between the third conveyor roller 4 and the second conveyor roller 3 or between the first relay conveyor roller 16 and the fourth conveyor roller 5 and moves out, it will enter the interior of the second guide groove through the opening of the second guide groove, and the composite electrode strip 14 will be guided by the second guide groove.

[0063] The first guide mechanism includes an upper transport belt group 6 and a lower transport belt group 7 fixedly connected to one side of the machine body 1. The upper transport belt group 6 and the lower transport belt group 7 are electrically connected to the controller. The lower transport belt group 7 is located on the lower side of the upper transport belt group 6. The first guide groove is the space between the upper transport belt group 6 and the lower transport belt group 7 of the first guide mechanism. At this time, by starting the upper transport belt group 6 and the lower transport belt group 7, the inner part of the guide groove between the upper transport belt group 6 and the lower transport belt group 7 can be better driven to move;

[0064] The second guide mechanism also includes an upper transport belt group 6 and a lower transport belt group 7 fixedly connected to one side of the machine body 1. The upper transport belt group 6 and the lower transport belt group 7 are both electrically connected to the controller. The lower transport belt group 7 is located on the lower side of the upper transport belt group 6. The first guide groove is the space between the upper transport belt group 6 and the lower transport belt group 7 of the first guide mechanism. At this time, by starting the upper transport belt group 6 and the lower transport belt group 7, the inner part of the guide groove between the upper transport belt group 6 and the lower transport belt group 7 can be better driven to move.

[0065] In order to automatically control the forward and reverse transportation of the upper transport belt group 6 and the lower transport belt group 7, the first guide groove and the second guide groove are fixedly connected to the position away from their openings with a position sensor 8 electrically connected to the controller to monitor the length of the composite electrode strip 14 entering the guide groove. The position sensor 8 can be a contact sensor or an infrared ranging sensor, as long as it can measure whether the composite electrode strip 14 inside the guide groove has reached the specified position.

[0066] At the same time, if Figure 2-3 As shown, in order to enable the composite electrode strip 14 to better enter the first guide groove, a rotating rod is rotatably connected to the rear end of the transport belt group 7 under the first guide mechanism on one side of the body 1, and a guide plate 9 is fixedly connected to the front side of the rotating rod. A servo motor electrically connected to the controller is fixedly connected to the body 1. After the servo motor is started, it will drive the rotating rod to rotate. When the rotating rod rotates, it can drive the guide plate 9 to rotate. When the rear end of the guide plate 9 rotates downward until it contacts the conveying roller, the moving composite electrode strip 14 will enter the first guide groove under the guidance of the guide plate 9.

[0067] like Figure 2-3As shown, a moving mechanism 15 is fixedly connected to one side of the body 1 and located at the lower side of the lower transport belt group 7. The moving mechanism 15 can be a linear moving device such as an electric push rod and a linear displacement table. The moving mechanism 15 is fixedly connected to a lower wind knife 11 whose initial position is located at the lower side of the lower transport belt group 7. The lower wind knife 11 is also connected to a fan or an air pump. An upper air outlet is provided on the upper side of the lower wind knife 11. The moving mechanism 15 can drive the lower wind knife 11 to move to the rear end of the guide plate 9. At this time, the fan can be started to supply air to the lower wind knife 11. The wind force inside the lower wind knife 11 will blow to the lower side of the composite pole piece belt body 14 through the upper air outlet, pressurizing the lower side of the composite pole piece belt body 14, so that the composite pole piece belt body 14 can be better moved to the upper side of the guide plate 9.

[0068] At the same time, a plurality of CCD monitors 13 electrically connected to the controller are fixedly connected to one side of the body 1. The plurality of CCD monitors 13 are respectively located on the upper side of the first guide mechanism and the second guide mechanism. At this time, the composite electrode strip 14 can be monitored through the CCD monitors 13.

[0069] At the same time, a cutter, a traction mechanism, a deviation correction mechanism and a tape flying mechanism can also be assembled on one side of the body 1 and located behind the first conveying roller 2 and the second conveying roller 3;

[0070] The working principle of the present invention is:

[0071] When the composite electrode strip 14 passes through the roller gap between the first conveyor roller 2 and the second conveyor roller 3, the composite electrode strip 14 is driven forward by the rotation and extrusion of the first conveyor roller 2 and the second conveyor roller 3. After the composite electrode strip 14 passes through the first conveyor roller 2 and the second conveyor roller 3, the moving mechanism 15 drives the lower wind knife 11 to move to the bottom of the composite electrode strip 14, the guide plate 9 rotates and rises upward, and the upper air outlet of the lower wind knife 11 starts to discharge air and floats the composite electrode strip 14. Figure 5 As shown, when the composite pole piece belt 14 contacts the first guide groove above the third conveying roller 4, the upper transport belt group 6 and the lower transport belt group 7 start to rotate and pull the composite pole piece belt 14 into the first guide groove;

[0072] After the composite electrode strip 14 contacts the sensor, the lower air knife 11 stops discharging air and moves to its original position, the guide plate 9 drops, and the transport belt stops moving. Since the depth of the guide groove is constant, the depth of the guide groove determines the size of the square battery cell. The first conveyor roller 2 and the second conveyor roller 3 continue to squeeze and transport the composite electrode strip 14. At this time, the upper air knife 10 starts to discharge air, and the lower air outlet of the upper air knife 10 is facing the electrode, and the composite electrode strip 14 is deformed downward. Figure 6As shown, the composite electrode strip 14 moves toward the roller gap between the second conveyor roller 3 and the third conveyor roller 4. When the composite electrode strip 14 is squeezed and reaches the roller gap between the second conveyor roller 3 and the third conveyor roller 4, the composite electrode strip 14 is squeezed into the roller gap between the second conveyor roller 3 and the third conveyor roller 4, and the composite electrode strip 14 in the guide groove above the third conveyor roller 4 is brought out. The sensor in the guide groove above the third conveyor roller 4 senses that the composite electrode strip 14 is brought out, and the upper conveyor belt group 6 and the lower conveyor belt group 7 start to reverse and convey outward. The composite electrode strip 14 passes through the second conveyor roller 3 and the third conveyor roller 4 and arrives at the second guide groove below the second conveyor roller 3. The upper conveyor belt group 6 and the lower conveyor belt group 7 rotate to drive the composite electrode strip 14.

[0073] When the composite electrode strip 14 contacts the sensor in the slot, the side wind knife 12 below the second conveyor roller 3 starts blowing air, causing the composite electrode strip 14 to squeeze into the roller gap between the third conveyor roller 4 and the fourth conveyor roller 5. The same principle is used for subsequent folding. During each folding, the composite electrode strip 14 is squeezed out of the guide slot by the rollers and no longer enters the current guide slot.

[0074] When the stacked segments of a square cell are folded, the composite electrode strip 14 is cut by a cutter, and the traction mechanism pulls the composite electrode strip 14 back into the first conveyor roller 2 and the second conveyor roller 3 to form the composite electrode strip 14. The composite electrode strip 14 then re-enters the guide groove, and a new round of folding begins.

[0075] A traction mechanism is provided in front of the first conveyor roller 2 and the second conveyor roller 3. After the cutter cuts off the rear electrode, the traction mechanism pulls the electrode into the first conveyor roller 2 and the second conveyor roller 3 for a new round of folding. Since the composite electrode strip 14 is folded many times, the cutter cuts off the electrode in advance according to the predetermined length. The new round of folding can be carried out synchronously with the current folding. The depth of all guide mechanisms is consistent. During the folding process, the CCD monitors the position of the electrode 13. A correction mechanism is provided in front of the first conveyor roller 2 and the second conveyor roller 3 to control the folding alignment of the composite electrode strip 14; a tape flying mechanism is provided in front of the first conveyor roller 2 and the second conveyor roller 3 to fly the tape in advance at the folding position of the positive and negative electrodes to prevent tape breakage and powder falling during the folding process.

[0076] A composite pole piece strip folding process, using a composite pole piece strip folding device to fold a composite pole piece strip body 14, comprises the following steps:

[0077] Step 1: Place the composite electrode strip 14 between the first conveying roller 2 and the second conveying roller 3, start the rotating driving device to drive the first conveying roller 2 and the second conveying roller 3 to rotate, and let the composite electrode pass through the roller gap between the first conveying roller 2 and the second conveying roller 3 until the composite electrode strip 14 enters the first guide groove;

[0078] Step 2: Start the downward pressure applying mechanism to apply downward pressure to the composite electrode, so that the composite electrode strip 14 is squeezed into the roller gap between the second conveying roller 3 and the third conveying roller 4;

[0079] Step 3: Start the rotating driving device to drive the second conveying roller 3 and the third conveying roller 4 to rotate, and let the two-layer composite electrode pass through the roller gap between the second conveying roller 3 and the third conveying roller 4 until the two-layer composite electrode strip 14 enters the first guide groove, forming two composite electrode pieces, and completing the first bending of the composite electrode strip 14;

[0080] Step 4: Start the side pressure applying mechanism to apply side pressure to the composite electrode, so that the composite electrode strip 14 is squeezed into the roller gap between the third conveying roller 4 and the fourth conveying roller 5;

[0081] Step 5: Start the rotating driving device to drive the third conveying roller 4 and the fourth conveying roller 5 to rotate, and let the three-layer composite electrode pass through the roller gap between the third conveying roller 4 and the fourth conveying roller 5 until the three-layer composite electrode strip 14 enters the first guide groove, forming three composite electrode pieces, and completing the second bending of the composite electrode strip 14.

[0082] In summary, the present application replaces the electrode cutting and stacking process, which requires the positive and negative electrode strips to be cut into fixed lengths in advance. During the cutting process, burrs are easily generated, and during the stacking process, the continuous high-speed stacking cannot be achieved due to the movement and positioning of the mechanical hand, resulting in low production efficiency. In the present application, the electrode strips do not need to be cut during the manufacturing of the battery. In the folding process of the present application, the device can run continuously at high speed, and the burrs generated due to cutting are reduced, improving the production efficiency of the stacked battery. The present application is obviously superior to the cutting and stacking process in terms of quality control, production efficiency, and cost control.

[0083] The above description is only the preferred embodiment of the present application, and it should be pointed out that for ordinary skilled persons in the art, without departing from the principle of the present application, a number of improvements and refinements can be made, which should also be considered as the protection scope of the present application. The structures, devices and operation methods not specifically described and explained in the present application, such as without special description and limitation, are implemented according to the conventional means in the art.

Claims

1. A composite electrode strip folding device, characterized in that: The invention comprises a machine body (1) and a controller, wherein one side of the machine body (1) is rotatably connected to a first transmission roller (2), a second transmission roller (3), a third transmission roller (4) and a fourth transmission roller (5), and a rotary drive device is installed on the machine body (1) and is connected to the first transmission roller (2), the second transmission roller (3), the third transmission roller (4) and the fourth transmission roller (5). The first transmission roller (2), the second transmission roller (3), the third transmission roller (4) and the fourth transmission roller (5) are all independently driven by the rotary drive device, and the controller is electrically connected to the rotary drive device. The second conveying roller (3) is located at the lower side of the first conveying roller (2), the third conveying roller (4) is located in front of the second conveying roller (3), and the fourth conveying roller (5) is located at the lower side of the third conveying roller (4); One side of the machine body (1) is equipped with a downward pressure applying mechanism located on the upper side of the third conveying roller (4), and one side of the machine body (1) is equipped with a side pressure applying mechanism located on the lower side of the second conveying roller (3); One side of the machine body (1) is equipped with a first guide mechanism and a plurality of second guide mechanisms, the first guide mechanism is located on the upper side of the third conveying roller (4), the first guide mechanism is provided with a first guide groove with a rear opening, and the rear end of the first guide groove is inclined downward; The second guide mechanism is located at the rear side of the fourth conveying roller (5), and a second guide groove with a front opening is provided on the second guide mechanism, and the front end of the second guide groove is inclined upward.

2. A composite electrode strip folding device according to claim 1, characterized in that: One side of the machine body (1) is also rotatably connected with at least one first relay transmission roller (16) and at least one second relay transmission roller (17), the first relay transmission roller (16) and the second relay transmission roller (17) are both transmission-connected to the rotary drive device, the number of the first relay transmission roller (16) and the second relay transmission roller (17) is the same, one first relay transmission roller (16) and one second relay transmission roller (17) constitute a transmission group, and the plurality of transmission groups are arranged in order from top to bottom, the first relay transmission roller (16) in the same transmission group is located on the upper side of the second relay transmission roller (17), the first relay transmission roller (16) in the first transmission group is located in front of the fourth transmission roller (5), and the first relay transmission roller (16) in the next transmission group is located in front of the second relay transmission roller (17) in the previous transmission group; A downward pressure applying mechanism is also provided on one side of the machine body (1) and located above the first relay conveying roller (16); One side of the machine body (1) is equipped with a side pressure applying mechanism located on the rear side of the second relay transmission roller (17); A first guide mechanism is installed on one side of the machine body (1) and located above the first relay transmission roller (16); A second guide mechanism is installed on one side of the machine body (1) and located at the rear side of the second relay transmission roller (17).

3. The composite electrode strip folding device according to claim 2, characterized in that: The downward pressure applying mechanism comprises an upper air knife (10) fixedly connected to one side of the machine body (1), the upper air knife (10) is located on the rear side of the first guide mechanism, and a lower air outlet is provided on the lower side of the upper air knife (10); The side pressure applying mechanism comprises a side wind knife (12) fixedly connected to one side of the machine body (1); the second guide mechanism is located on the lower side of the side wind knife (12); and a side air outlet is provided on the front side of the side wind knife (12) of the side pressure applying mechanism.

4. The composite electrode strip folding device according to claim 2, characterized in that: Positions of the first guide groove and the second guide groove away from their openings are both fixedly connected to position sensors (8) electrically connected to the controller.

5. The composite electrode strip folding device according to claim 4, characterized in that: The first guide mechanism comprises an upper transport belt group (6) and a lower transport belt group (7) fixedly connected to one side of the machine body (1); the upper transport belt group (6) and the lower transport belt group (7) are both electrically connected to the controller; the lower transport belt group (7) is located on the lower side of the upper transport belt group (6); and the first guide groove is the space between the upper transport belt group (6) and the lower transport belt group (7) of the first guide mechanism; The second guide mechanism comprises an upper transport belt group (6) and a lower transport belt group (7) fixedly connected to one side of the machine body (1); the upper transport belt group (6) and the lower transport belt group (7) are both electrically connected to the controller; the lower transport belt group (7) is located on the lower side of the upper transport belt group (6); and the first guide groove is the space between the upper transport belt group (6) and the lower transport belt group (7) of the first guide mechanism.

6. The composite electrode strip folding device according to claim 5, characterized in that: A rotating rod is rotatably connected to one side of the machine body (1) and the rear end of the transport belt group (7) under the first guide mechanism, and a guide plate (9) is fixedly connected to the front side of the rotating rod. A servo motor electrically connected to the controller is fixedly connected to the machine body (1).

7. The composite electrode strip folding device according to claim 6, characterized in that: A moving mechanism (15) is fixedly connected to one side of the machine body (1) and located below the lower transport belt group (7); a lower air knife (11) is fixedly connected to the moving mechanism (15), the lower air knife (11) being initially located below the lower transport belt group (7); an upper air outlet is provided on the upper side of the lower air knife (11); and the moving mechanism (15) can drive the lower air knife (11) to move to the rear end of the guide plate (9).

8. The composite electrode strip folding device according to claim 2, characterized in that: One side of the machine body (1) is also fixedly connected with a plurality of CCD monitors (13) electrically connected to the controller, and the plurality of CCD monitors (13) are respectively located on the upper sides of the first guide mechanism and the second guide mechanism.

9. The composite electrode strip folding device according to claim 2, characterized in that: A cutter, a traction mechanism, a deviation correction mechanism and a tape flying mechanism are also assembled on one side of the machine body (1) and located behind the first conveying roller (2) and the second conveying roller (3).

10. A composite pole piece strip folding process, comprising folding a composite pole piece strip body (14) using any one of the composite pole piece strip folding devices according to claims 1 to 9, characterized in that: The following steps are involved: Step 1: placing the composite electrode strip (14) between the first conveying roller (2) and the second conveying roller (3), starting the rotary drive device to drive the first conveying roller (2) and the second conveying roller (3) to rotate, allowing the composite electrode to pass through the roller gap between the first conveying roller (2) and the second conveying roller (3) until the composite electrode strip (14) enters the first guide groove; Step 2: activating the downward pressure applying mechanism to apply downward pressure to the composite electrode piece, so that the composite electrode piece strip (14) is squeezed into the roller gap between the second conveying roller (3) and the third conveying roller (4); Step 3: Start the rotary drive device to drive the second conveying roller (3) and the third conveying roller (4) to rotate, so that the two-layer composite electrode sheet passes through the roller gap between the second conveying roller (3) and the third conveying roller (4), until the two-layer composite electrode sheet strip (14) enters the first guide groove, completing a bending of the composite electrode sheet strip (14); Step 4: activating the side pressure applying mechanism to apply side pressure to the composite electrode piece, so that the composite electrode piece strip (14) is squeezed into the roller gap between the third conveying roller (4) and the fourth conveying roller (5); Step 5: Start the rotary drive device to drive the third conveyor roller (4) and the fourth conveyor roller (5) to rotate, allowing the three-layer composite electrode to pass through the roller gap between the third conveyor roller (4) and the fourth conveyor roller (5) until the three-layer composite electrode strip (14) enters the first guide groove, completing the secondary bending of the composite electrode strip (14).

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