Composite pole piece belt folding device and folding process

Abstract

The invention belongs to the technical field of batteries, and particularly relates to a composite pole piece belt folding device and a folding process, the composite pole piece belt folding device is adopted to fold a composite pole piece belt body, and the composite pole piece belt folding device comprises a machine body and a controller, one side of the machine body is rotationally connected with a first conveying roller, a second conveying roller, a third conveying roller and a fourth conveying roller, and the machine body is provided with rotary driving equipment which is in transmission 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 all in independent transmission with the rotation driving device, and the controller is electrically connected with the rotation driving device. According to the invention, a pole piece cutting and stacking process can be replaced, the pole piece does not need to be punched in the battery cell manufacturing process, burrs generated by punching are reduced, continuous high-speed operation can be realized, and the production efficiency of the laminated battery is improved.

Description

Technical Field

[0001] The 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 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 stacked sheets is high, during the production of stacked batteries, the composite electrode strip needs to be punched out through a punching process, and then the punched composite electrode sheets are stacked together and positioned. This is affected by hardware issues 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 strip no longer requires a punching process, which reduces the burrs caused by punching and can operate continuously at high speed, thereby improving the production efficiency of stacked batteries.

[0006] The technical solution adopted by the present invention is as follows:

[0007] A composite pole piece strip folding device comprises a body and a controller, one side of the body is rotatably connected with a first conveying roller, a second conveying roller, a third conveying roller and a fourth conveying roller, a rotating drive device which is transmission-connected with the first conveying roller, the second conveying roller, the third conveying roller and the fourth conveying roller is installed on the body, and the first conveying roller, the second conveying roller, the third conveying roller and the fourth conveying roller are all independently transmitted with the rotating drive device, and the controller is electrically connected with the rotating drive device;

[0008] The second conveying roller is located at the lower side of the first conveying roller, the third conveying roller is located at the front side 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 on the upper side of the third conveying roller, a first guide groove with a rear opening is provided on the first guide mechanism, and a 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, and a second guide groove with a front opening is provided on the second guide mechanism, and a front end of the second guide groove is inclined upward.

[0012] Furthermore, one side of the machine body is also rotatably connected with 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 form a transmission group, and the plurality of 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 installed on one side of the machine body and located on the upper side of the first relay conveying roller;

[0014] A side pressure applying mechanism is mounted on one side of the machine body and is 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 on the upper side of the first relay transmission 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] Further, the downward pressure applying mechanism comprises an upper air knife fixedly connected to one side of the machine body, the upper air knife is located at the rear side of the first guide mechanism, and a lower air outlet is provided at the lower side of the upper air knife;

[0018] The side pressure applying mechanism comprises 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 provided at 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 their openings with position sensors electrically connected to the controller.

[0020] Further, 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 at the lower side of 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 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 electrically connected to the controller, the lower transport belt group is located at the lower side of 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.

[0022] Furthermore, a rotating rod is rotatably connected to the rear end of the transport belt group under the first guide mechanism on one side of the body, a guide plate is fixedly connected to the front side of the rotating rod, and a servo motor electrically connected to the controller is fixedly connected to the body.

[0023] Furthermore, a moving mechanism is fixedly connected to one side of the machine body and located at the lower side of the lower transport belt group, and a lower wind knife is fixedly connected to the moving mechanism, whose initial position is located at the lower side of the lower transport belt group. An upper air outlet is provided on the upper side of the lower wind knife, and the moving mechanism can drive the lower wind knife to move to the rear end of the guide plate.

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

[0025] Furthermore, a cutter, a traction mechanism, a deviation correction mechanism and a tape flying mechanism are also installed on one side of the machine body and located at the rear side of the first conveying roller and the second conveying roller.

[0026] A composite pole piece strip folding process comprises the following steps:

[0027] Step 1: Place the composite pole piece strip between the first conveyor roller and the second conveyor roller, start the rotary drive device to drive the first conveyor roller and the second conveyor roller to rotate, and let the composite pole piece pass through the roller gap between the first conveyor roller and the second conveyor roller until the composite pole piece strip enters the first guide groove;

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

[0029] Step 3: Start the rotary drive device to drive the second conveyor roller and the third conveyor roller to rotate, so that the two-layer composite electrode sheet passes through the roller gap between the second conveyor roller and the third conveyor roller, until the two-layer composite electrode sheet belt enters the first guide groove, completing a bending of the composite electrode sheet belt;

[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 conveyor roller and the fourth conveyor roller to rotate, so that the three-layer composite electrode sheet passes through the roller gap between the third conveyor roller and the fourth conveyor roller, until the three-layer composite electrode sheet strip enters the first guide groove, completing the secondary bending of the composite electrode sheet strip.

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

[0033] A composite electrode strip folding device and folding process of the present invention replaces 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, and burrs are easily generated during the punching process. During the stacking process, the electrodes are 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 electrodes in battery cell manufacturing. During the folding process of the present invention, the equipment can operate continuously at high speed, and burrs caused by punching are reduced, thereby improving the production efficiency of stacked 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 schematic diagram of the structure of the present invention;

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

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

[0037] Figure 4 It 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 listed 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 pole piece belt body (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 specifically described below in conjunction with embodiments. It should be understood that the following text is only used to describe one or several specific embodiments of the present invention, and does not strictly limit the scope of protection of the specific claims of the present invention.

[0044] like Figure 1-7 As shown, a composite pole piece strip folding device comprises a body 1 and a controller, one side of the body 1 is rotatably connected with a first conveying roller 2, a second conveying roller 3, a third conveying roller 4 and a fourth conveying roller 5, a rotating driving device which 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 is installed on the body 1, 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 transmitted to the rotating driving device, and the controller is electrically connected to the rotating driving 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 rotary drive devices. 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 driving device may be that the rotary driving device includes multiple servo motors fixedly connected to the machine 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 motor, the conveying roller can be driven to rotate clockwise or counterclockwise.

[0047] Similarly, another structure of the rotary driving device may be that the rotary driving device includes multiple pneumatic motors, and the output ends of the multiple pneumatic 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 motor, the conveying roller can be driven to rotate clockwise or counterclockwise.

[0048] like Figure 1 and Figure 4 As shown, the second conveyor roller 3 is located at the lower side of the first conveyor roller 2, the third conveyor roller 4 is located at the front side of the second conveyor roller 3, the fourth conveyor roller 5 is located at the lower side of the third conveyor roller 4, and the roller gap width between the first conveyor roller 2 and the second conveyor roller 3 is smaller than the thickness of the composite electrode strip 14, the thickness of the composite electrode strip 14 can be the thickness of the positive electrode strip + the thickness of the negative electrode strip + the thickness of the diaphragm * 3, the roller gap width between the second conveyor roller 3 and the third conveyor roller 4 is smaller than the thickness of the two composite electrode strips 14, the roller gap width between the third conveyor roller 4 and the fourth conveyor roller 5 is smaller than the thickness of the three composite electrode strips 14, and the gap widths of the multiple roller gaps are increased by the thickness of one composite electrode strip 14 in order from top to bottom;

[0049] like Figure 4-6 As shown, when the composite pole piece strip 14 passes through the roller gap, it is squeezed and pushed 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 pole piece strip 14 forward until the composite pole piece strip 14 moves to the upper side of the third conveying roller 4;

[0050] like Figure 4-6 As shown, 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 pole piece strip 14 moves to the upper side of the third conveying roller 4, the composite pole piece strip 14 can be driven to move downward by the downward pressure applying mechanism, so that the lower side of the composite pole piece strip 14 and the third conveying roller 4 are fully fitted, and a bend is formed at the position where the composite pole piece strip 14 is subjected to downward pressure. At this time, the third conveying roller 4 is driven to rotate clockwise by the rotary driving device, and the bent composite pole piece strip 14 can be driven to move by the second conveying roller 3 and the third conveying roller 4, and the composite pole piece strip 14 passing through the roller gap between the second conveying roller 3 and the third conveying roller 4 is bent once to form two composite stacked segments.

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

[0052] Here, the subsequent composite pole piece strip 14 is a portion that is not folded.

[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, one first relay transmission roller 16 and one second relay transmission roller 17 are connected to the first relay transmission roller 16 and the ... The second relay transmission rollers 17 form 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 pole piece strip 14 can be folded by rotating the first relay transmission roller 16 and the second relay transmission roller 17.

[0054] In order to make the subsequent composite pole piece belt body 14 fully fit with the first relay conveying roller 16 and the second relay conveying roller 17, a downward pressure applying mechanism is also installed on one side of the body 1 and located on the upper side of the first relay conveying roller 16. When the stack segment moves to the upper side of the first relay conveying roller 16, the stack segment and the composite pole piece belt body 14 can be driven downward by the downward pressure applying mechanism, so that the lower side of the stack segment and the first relay conveying roller 16 are fully fitted, and a bend is formed at the connection between the stack segment and the subsequent composite pole piece belt body 14. At this time, the first relay conveying roller 16 is driven by the rotating driving device to rotate clockwise, and the bent stack segment and the subsequent composite pole piece belt body 14 can be driven by the first relay conveying roller 16 to move, completing the stack segment and the subsequent composite pole piece belt body 14 bending again.

[0055] like Figure 4-6 As shown, one side of the machine body 1 is equipped with a side pressure applying mechanism located at the rear side of the second relay conveying roller 17. When the stack segment moves down to one side of the second relay conveying roller 17, and the connection between the stack segment and the subsequent composite electrode sheet belt 14 is opposite to the roller gap between the first relay conveying roller 16 and the second relay conveying roller 17, the composite electrode sheet belt 14 can be driven by the side pressure applying mechanism to move to the side close to the first relay conveying roller 16 and the second relay conveying roller 17, so that the stack segment and the second relay conveying roller 17 are fully fitted, and a bend is formed at the connection between the stack segment and the subsequent composite electrode sheet belt 14. At this time, the lower transport belt group 7 is driven by the rotary drive device to rotate counterclockwise, and the bent stack segment and the subsequent composite electrode sheet belt 14 can be driven by the first relay conveying roller 16 and the second relay conveying roller 17 to move, and the stack segment and the subsequent composite electrode sheet belt 14 passing through the roller gap between the first relay conveying roller 16 and the second relay conveying roller 17 are bent again.

[0056] Among them, Figure 2-3 As shown, the downward pressure applying mechanism and the side pressure applying mechanism are both pressure applying mechanisms, which can be a combination of an air knife or a cylinder shaft;

[0057] When the lower pressure applying mechanism and the side pressure applying mechanism are wind knives, the lower pressure applying mechanism includes an upper wind knife 10 fixedly connected to one side of the machine body 1, the upper wind knife 10 is connected to a fan or an air pump, and a lower air outlet is opened on the lower side of the upper wind knife 10. When the upper wind knife 10 takes in air, the wind is discharged to the upper side of the composite pole piece belt body 14 through the lower air outlet, and the lower pressure is applied to the composite pole piece belt body 14 from the upper side of the composite pole piece belt body 14;

[0058] The side pressure applying mechanism includes a side wind knife 12 fixedly connected to one side of the body 1, the side wind knife 12 is connected to a fan or an air pump, and a side air outlet is opened 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 pole piece belt body 14, and side pressure is applied to the composite pole piece belt body 14 from the rear side of the composite pole piece belt body 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 influence 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 both the downward pressure applying mechanism and the side pressure applying mechanism 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 belt 14 are against each other, pressure can be applied to the composite pole piece belt 14, and the friction resistance encountered by the composite pole piece belt 14 when moving can be reduced by rotating the shaft.

[0061] At the same time, if Figure 2-3 As shown, in order to guide the composite electrode sheet strip 14, one side of the body 1 is equipped with multiple first guide mechanisms and multiple second guide mechanisms, and 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, and 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, and the rear end of the first guide groove is inclined toward the lower side. At this time, when the composite electrode sheet 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 sheet strip 14 is guided by the first guide groove.

[0062] Further, such as Figure 2-3 As shown, a plurality of second guide mechanisms are respectively located at the rear sides of the fourth conveying roller 5 and the second relay conveying roller 17, the second guide mechanism is located at the lower side of the side wind knife 12, 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. At this time, when the composite electrode sheet strip 14 passes through the roller groove between the third conveying roller 4 and the second conveying roller 3 or between the first relay conveying roller 16 and the fourth conveying 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 sheet 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 at 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. 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 electrically connected to the controller. The lower transport belt group 7 is located at 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 upper transport belt group 6 and the lower transport belt group 7 for forward and reverse transport, the first guide groove and the second guide groove are fixedly connected to the positions away from their openings with position sensors 8 electrically connected to the controller to monitor the length of the composite pole piece belt 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 pole piece belt 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 pole piece belt 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 pole piece belt 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. A lower wind knife 11 is fixedly connected to the moving mechanism 15, and its 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 let air into the lower wind knife 11. The wind force inside the lower wind knife 11 will blow toward the lower side of the composite pole piece belt body 14 through the upper air outlet, and pressurize 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 pole piece 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 may also be installed on one side of the machine 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 pole piece belt 14 passes through the roller gap between the first conveyor roller 2 and the second conveyor roller 3, the composite pole piece belt 14 is driven forward by the rotation and extrusion of the first conveyor roller 2 and the second conveyor roller 3. After the composite pole piece belt 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 below the composite pole piece belt 14, the guide plate 9 rotates upward and rises, and the upper air outlet of the lower wind knife 11 starts to discharge air and float and drag the composite pole piece belt 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 conveying belt group 6 and the lower conveying belt group 7 start to rotate and pull the composite pole piece belt 14 into the first guide groove;

[0072] After the composite pole piece belt 14 contacts the sensor, the lower wind knife 11 stops exhausting and moves to the original position, the guide plate 9 drops, and the conveyor 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 convey the composite pole piece belt 14. At this time, the upper wind knife 10 starts to exhaust, and the lower air outlet of the upper wind knife 10 faces the pole piece, and the composite pole piece belt 14 is deformed downward, as shown in the following figure. Figure 6As shown, the composite pole piece belt 14 moves toward the roller gap between the second conveyor roller 3 and the third conveyor roller 4. When the composite pole piece belt 14 is squeezed to reach the roller gap between the second conveyor roller 3 and the third conveyor roller 4, the composite pole piece belt 14 is squeezed into the roller gap between the second conveyor roller 3 and the third conveyor roller 4, and the composite pole piece belt 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 pole piece belt 14 is brought out, and the upper conveyor belt group 6 and the lower conveyor belt group 7 begin to reverse and transport outward, and the composite pole piece belt 14 passes through the second conveyor roller 3 and the third conveyor roller 4, and arrives in the second guide groove below the second conveyor roller 3, and the upper conveyor belt group 6 and the lower conveyor belt group 7 rotate to drive the composite pole piece belt 14;

[0073] When the composite pole piece strip 14 contacts the sensor in the slot, the side wind knife 12 under the second conveyor roller 3 starts to blow air, so that the composite pole piece strip 14 is squeezed into the roller gap between the third conveyor roller 4 and the fourth conveyor roller 5, and the composite pole piece strip 14 is folded multiple times in the same principle. During each folding, the composite pole piece strip 14 is squeezed out of the guide slot by the rollers and no longer enters the current guide slot.

[0074] When a stacked segment of a square battery cell is folded, the composite pole piece strip 14 is cut by a cutter, and the traction mechanism pulls the composite pole piece strip 14 to re-enter the first conveying roller 2 and the second conveying roller 3 to form the composite pole piece strip 14, and then the composite pole piece strip 14 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 and stick the tape in advance at the folding position of the positive and negative electrode strips 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 pole piece strip 14 between the first conveyor roller 2 and the second conveyor roller 3, start the rotary drive device to drive the first conveyor roller 2 and the second conveyor roller 3 to rotate, and let the composite pole piece pass through the roller gap between the first conveyor roller 2 and the second conveyor roller 3 until the composite pole piece strip 14 enters the first guide groove;

[0078] Step 2: Start the downward pressure applying mechanism to apply downward pressure to the composite electrode sheet, so that the composite electrode sheet 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 rotary drive device to drive the second conveyor roller 3 and the third conveyor roller 4 to rotate, so that the two-layer composite electrode sheet passes through the roller gap between the second conveyor roller 3 and the third conveyor roller 4, until the two-layer composite electrode sheet strip 14 enters the first guide groove to form two composite stacked segments, completing a bending of the composite electrode sheet strip 14;

[0080] Step 4: Start 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;

[0081] Step 5: Start the rotary drive device to drive the third conveyor roller 4 and the fourth conveyor roller 5 to rotate, so that the three-layer composite electrode sheet passes through the roller gap between the third conveyor roller 4 and the fourth conveyor roller 5, until the three-layer composite electrode sheet strip 14 enters the first guide groove to form three composite stacked segments, completing the secondary bending of the composite electrode sheet strip 14.

[0082] In summary, the present invention replaces the electrode sheet 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 sheets 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 stacked batteries. It is significantly superior to the cutting and stacking process in terms of quality control, production efficiency, and cost control.

[0083] The above is only a preferred embodiment of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principles of the present invention, and these improvements and modifications should also be considered as the protection scope of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention shall be implemented according to the conventional means in the art unless otherwise specified and limited.

Claims

1. A composite pole piece 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 rotating drive device which is transmission-connected to the first transmission roller (2), the second transmission roller (3), the third transmission roller (4) and the fourth transmission roller (5) is installed on the machine body (1), and the first transmission roller (2), the second transmission roller (3), the third transmission roller (4) and the fourth transmission roller (5) are all independently transmitted to the rotating drive device, and the controller is electrically connected to the rotating 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 at the front side 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); A first guide mechanism and a plurality of second guide mechanisms are installed on one side of the machine body (1), 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 which is open at the rear side, 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 pole piece 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) form 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 installed on one side of the machine body (1) and located on the upper side of the first relay conveying roller (16); One side of the machine body (1) is equipped with a side pressure applying mechanism located at 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. A composite pole piece 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) being located at the rear side of the first guide mechanism, and a lower air outlet being provided at 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 at the lower side of the side wind knife (12); and a side air outlet is provided at the front side of the side wind knife (12) of the side pressure applying mechanism.

4. A composite pole piece 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. A composite pole piece 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 at 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 at 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. A composite pole piece 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. A composite pole piece 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 wind knife (11) is fixedly connected to the moving mechanism (15) and is initially located below the lower transport belt group (7); an upper wind outlet is provided on the upper side of the lower wind knife (11); and the moving mechanism (15) can drive the lower wind 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: A plurality of CCD monitors (13) electrically connected to the controller are also fixedly connected to one side of the machine body (1), and the plurality of CCD monitors (13) are respectively located on the upper side of the first guide mechanism and the upper side of the second guide mechanism.

9. A composite pole piece 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 installed 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, using any composite pole piece strip folding device as claimed in any one of claims 1 to 9 to fold a composite pole piece strip body (14), characterized in that: The following steps are involved: Step 1: placing the composite pole piece 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 pole piece to pass through the roller gap between the first conveying roller (2) and the second conveying roller (3), until the composite pole piece strip (14) enters the first guide groove; Step 2: starting the downward pressure applying mechanism to apply downward pressure to the composite electrode sheet, so that the composite electrode sheet 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: starting 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, so that the three-layer composite electrode sheet passes through the roller gap between the third conveyor roller (4) and the fourth conveyor roller (5), until the three-layer composite electrode sheet strip (14) enters the first guide groove, completing the secondary bending of the composite electrode sheet strip (14).

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