A circulating composite lamination machine

Abstract

The present application discloses a circulating composite laminating machine, comprising: a feeding device for conveying a unit sheet material belt to a laminating table; the unit sheet material belt has a plurality of folding positions evenly distributed along its length direction; a laminating device, comprising: at least one laminating table located at the output end of the feeding device, and two pressing needle mechanisms arranged on the laminating table; the laminating table is used to receive the unit sheet material belt and reciprocate along a Z-shaped path to fold the unit sheet material belt along the folding positions in sequence; one pressing needle mechanism presses one folding position, and another pressing needle mechanism presses another folding position adjacent to the one folding position to form a layer of battery cells; the cycle is repeated in sequence until the preset number of layers required for the battery cells; the spacing between the two pressing needle mechanisms is the distance between two adjacent folding positions. Compared with the traditional stacking method, the method of producing battery cells by folding the unit sheet material belt along the folding positions does not require the process of transferring the pole piece or laminating unit by a robot, which shortens the process and improves the laminating efficiency.

Description

Technical Field

[0001] The present application relates to the technical field of battery production and manufacturing equipment, and in particular to a circulating composite stacking machine. Background Art

[0002] In the production process of lithium-ion batteries, the traditional stacking method is to cut the positive and negative electrode sheets, heat-combine them with the separator and roll them into a whole, and finally cut them into individual stacking units, stack them and produce battery cells. This method is not only inefficient, but also the stacking is unevenly pressed, resulting in the battery cells being too loose, affecting the yield rate of the finished battery. Summary of the invention

[0003] The present application provides a circulating composite stacking machine to improve the production efficiency of battery cells and increase the yield rate of finished batteries.

[0004] The present application provides a circulating composite lamination machine, comprising:

[0005] A feeding device, the feeding device is used to feed the unit sheet material belt to the lamination table; the unit sheet material belt has a plurality of folding positions evenly distributed along its length direction;

[0006] A stacking device comprises: at least one stacking platform and two pressing needle mechanisms, wherein the at least one stacking platform is located at the output end of a feeding device, and the two pressing needle mechanisms are arranged on the stacking platform; the stacking platform is used to receive a unit sheet material strip and reciprocate along a Z-shaped path to fold the unit sheet material strip along the multiple folding positions in sequence; one pressing needle mechanism presses a folding position, and the other pressing needle mechanism presses another folding position adjacent to the first folding position to form a layer of battery cells; the cycle is repeated in sequence until the preset number of layers required for the battery cells is reached; the spacing between the two pressing needle mechanisms is the distance between two adjacent folding positions.

[0007] The circulating composite laminating machine is characterized in that two laminating platforms are provided, wherein after one laminating platform folds the unit sheet material belt to the preset number of layers required for the battery cell, the other laminating platform takes over the unit sheet material belt to re-fold the unit sheet material belt; the two laminating platforms can be alternately moved to the output end of the feeding device to fold the unit sheet material belt along the folding position, or the two laminating platforms can alternately withdraw from the output end of the feeding device to form an avoidance.

[0008] The circulating composite laminating machine, wherein the laminating device further comprises: a cutting mechanism, wherein the cutting mechanism is used to cut the unit sheet material strip along the last folding position when the unit sheet material strip is folded to a preset number of layers.

[0009] The circulating composite lamination machine further comprises: a hot pressing device, which is used to perform hot flat pressing on the battery core to obtain a finished battery core.

[0010] The circulating composite laminating machine, wherein the hot pressing device includes: two hot pressing plates that can move relative to each other to get closer, or can move toward each other to move away, the two hot pressing plates move relative to each other to perform hot pressing on the battery cells, and move toward each other to release the finished battery cells after hot pressing.

[0011] The circulating composite lamination machine, wherein the unit sheet material strip includes: two stacked layers of diaphragm material strips, a first electrode layer arranged between the two layers of diaphragm material strips, an upper second electrode layer arranged on the upper surface of the upper diaphragm material strip, and a lower second electrode layer arranged on the lower surface of the lower diaphragm material strip; the first electrode layer includes a plurality of first electrode plates arranged in a straight line array along the length direction of the unit sheet material strip; the upper second electrode layer includes a plurality of upper second electrode plates, and the positions of the plurality of upper second electrode plates are respectively located directly above the first electrode plates of each even or odd position; the lower second electrode layer includes a plurality of lower second electrode plates, and the positions of the plurality of lower second electrode plates are respectively located directly below the first electrode plates of each odd or even position; along the length direction of the unit sheet material strip, the folding position is formed between adjacent upper second electrode plates and lower second electrode plates.

[0012] The circulating composite lamination machine, wherein the circulating composite lamination machine also includes: a unit sheet material strip making device arranged at the input end of the feeding device, the unit sheet material strip making device is used to make the unit sheet material strip and output the made unit sheet material strip to the input end of the feeding device; the unit sheet material strip making device includes: two diaphragm material strip unwinding assemblies, a first pole piece unwinding assembly, a first cutting assembly, an upper second pole piece unwinding assembly, a second cutting assembly, a lower second pole piece unwinding assembly, and a third cutting assembly; the two diaphragm material strip unwinding assemblies are used to release two layers of continuous diaphragm material strips; the first pole piece unwinding assembly is located between the two diaphragm material strip unwinding assemblies, the first pole piece unwinding assembly is used to release the first pole piece coil between the two layers of diaphragm material strips, the first cutting assembly is used to cut the first pole piece coil to a fixed length to form a plurality of first pole pieces, and make the A plurality of first pole pieces are arranged in a straight line array along the length direction of the unit sheet tape between two layers of diaphragm tape; the upper second pole piece unwinding assembly is located above the upper diaphragm tape unwinding assembly, and the upper second pole piece unwinding assembly is used to unwind the upper second pole piece roll to the upper surface of the upper diaphragm tape, and the second cutting assembly is used to cut the upper second pole piece roll to a fixed length to form the plurality of upper second pole pieces, and make the upper second pole piece directly above each even-numbered or odd-numbered first pole piece; the lower second pole piece unwinding assembly is located below the lower diaphragm tape unwinding assembly, and the lower second pole piece unwinding assembly is used to unwind the lower second pole piece roll to the lower surface of the lower diaphragm tape, and the third cutting assembly is used to cut the lower second pole piece roll to a fixed length to form the plurality of lower second pole pieces, and make the lower second pole piece directly below each odd-numbered or even-numbered first pole piece.

[0013] The circulating composite lamination machine, wherein the unit sheet material strip production device also includes: a pair of hot pressing rollers, the pair of hot pressing rollers are used to thermally composite the two stacked layers of diaphragm material strips, the first pole piece layer arranged between the two layers of diaphragm material strips, the upper second pole piece layer arranged on the upper surface of the upper diaphragm material strip, and the lower second pole piece layer arranged on the lower surface of the lower diaphragm material strip into a whole by rolling to obtain the unit sheet material strip.

[0014] In the circulating composite laminating machine, the feeding device comprises a pair of traction rollers, and the pair of traction rollers are used to traction and feed the unit sheet material belt to the laminating device.

[0015] The circulating composite laminating machine, wherein each of the pressing needle mechanisms comprises: two pressing needle assemblies, the two pressing needle assemblies are respectively located at the two ends of one side of the laminating platform, and each of the pressing needle assemblies comprises: a pressing needle, a pressing needle up and down driving unit, and a pressing needle rotation driving unit; the pressing needle up and down driving unit is used to drive the pressing needle to move downward in a direction perpendicular to the laminating platform to press the unit sheet material belt at the folding position, or drive the pressing needle to move upward in a direction perpendicular to the laminating platform to release the unit sheet material belt at the folding position; the pressing needle rotation driving unit is used to drive the pressing needle to rotate toward the outside of the laminating platform after moving upward to avoid the unit sheet material belt to be folded

[0016] The beneficial effects of the present invention are:

[0017] The circulating composite laminating machine provided in the present application comprises: a feeding device, which is used to convey the unit sheet material belt to the laminating table; the unit sheet material belt has a plurality of folding positions evenly distributed along its length direction; a laminating device, which comprises: at least one laminating table, and two pressing needle mechanisms, the at least one laminating table is located at the output end of the feeding device, and the two pressing needle mechanisms are arranged on the laminating table; the laminating table is used to receive the unit sheet material belt and reciprocate along a Z-shaped path to fold the unit sheet material belt along the plurality of folding positions in sequence; one pressing needle mechanism presses one folding position, and the other pressing needle mechanism presses another folding position adjacent to the one folding position to form a layer of battery cells; the cycle is repeated in sequence until the preset number of layers required for the battery cells; the spacing between the two pressing needle mechanisms is the distance between two adjacent folding positions. The unit sheet material strip is conveyed to the stacking table under the traction of the feeding device. While the stacking table moves along the Z-shaped path, a needle pressing mechanism on the stacking table presses a folding position, and another pressing mechanism presses another adjacent folding position, so as to fold the unit sheet material strip along the folding position to produce battery cells. Compared with the traditional stacking method, there is no need to transfer the pole pieces (or stacking units) through a robot, which shortens the process and improves the stacking efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the positional relationship between a unit sheet material belt manufacturing device, a material feeding device, and a laminating device in a circulating composite laminating machine provided in the present application;

[0019] Figure 2 This is a schematic diagram of the structure of the laminating device and the feeding device in the circulating composite laminating machine provided in the present application;

[0020] Figure 3a Schematic diagram of the movement of the laminating device in the circulating composite laminating machine provided in this application Figure 1 ;

[0021] Figure 3bThe schematic diagram of the lamination mechanism in the circulating composite lamination machine provided in this application is as follows: Figure 1 ;

[0022] Figure 4a Schematic diagram of the movement of the laminating device in the circulating composite laminating machine provided in this application Figure 2 ;

[0023] Figure 4b The schematic diagram of the lamination mechanism in the circulating composite lamination machine provided in this application is as follows: Figure 2 ;

[0024] Figure 5a Schematic diagram 3 of the movement of the laminating device in the circulating composite laminating machine provided by the present application;

[0025] Figure 5b The third schematic diagram of the action of the lamination mechanism in the circulating composite lamination machine provided in the present application;

[0026] Figure 6a Schematic diagram 4 of the movement of the laminating device in the circulating composite laminating machine provided by the present application;

[0027] Figure 6b Schematic diagram 4 of the action of the lamination mechanism in the circulating composite lamination machine provided in the present application;

[0028] Figure 7a A schematic diagram of the principle of connecting another lamination table with a lamination table that has already stacked cells;

[0029] Figure 7b It is a schematic diagram of the operation of each laminating mechanism in another laminating table and a laminating table on which battery cells have been stacked;

[0030] Figure 8 A schematic diagram of the structure of the unit sheet material strip provided in this application;

[0031] Fig. 9 A schematic diagram of hot flattening of the battery cell provided in this application;

[0032] Fig.10 This is a schematic diagram of the structure of the lamination table driving mechanism provided in this application. DETAILED DESCRIPTION

[0033] The present invention will be further described in detail below through specific implementation modes in conjunction with the accompanying drawings.

[0034] See also Figure 1-Figure 2As shown, the circulating composite laminating machine provided in the present application comprises: a feeding device 10 and a laminating device arranged at the output end of the feeding device 10. The feeding device 10 is used to convey the unit sheet material belt 100 to the laminating table 20, and the laminating device is used to reciprocate along a Z-shaped path to fold the unit sheet material belt 100 to form a battery cell. The laminating device comprises: at least one laminating table 20 for receiving the unit sheet material belt 100 conveyed from the feeding device 10 and two pressing needle mechanisms 30 arranged on the laminating table 20.

[0035] The feeding device 10 is used to convey the unit sheet material belt 100 to the laminating table 20. Specifically, the feeding device 10 includes a pair of traction rollers, and the pair of traction rollers are used to traction and feed the unit sheet material belt 100 to the laminating table 20 by traction feeding. It can be understood that one of the pair of traction rollers is an active roller, and the other traction roller is a driven roller. The driven roller can be driven by the driven roller driving mechanism to move toward the active roller to press the unit sheet material belt 100, or the driven roller can be driven by the driven roller driving mechanism to move away from the active roller to form a threading space for the unit sheet material belt 100. The active roller is used to drive the unit sheet material belt 100 to be conveyed by the driving of the active roller driving mechanism when the driven roller presses the active roller. Figure 2 The curved arrows shown in the figure indicate that the two pulling rollers rotate in opposite directions.

[0036] The unit sheet material strip 100 has a plurality of folding positions arranged along its length direction. It can be understood that the plurality of folding positions arranged in sequence along the length direction of the unit sheet material strip 100 are adjacent to each other in sequence along the length direction of the unit sheet material strip 100 .

[0037] See also Figure 8As shown, the unit sheet material strip 100 includes: two layers of diaphragm material strips 101 stacked, a first electrode layer arranged between the two layers of diaphragm material strips 101, an upper second electrode layer arranged on the upper surface of the upper diaphragm material strip 101, and a lower second electrode layer arranged on the lower surface of the lower diaphragm material strip 101. The first electrode layer includes a plurality of first electrode pieces 102 arranged in a straight line array along the length direction of the unit sheet material strip 100 (i.e., the length direction of the diaphragm material strip 101), and the upper second electrode layer includes a plurality of upper second electrode pieces 103, the plurality of upper second electrode pieces 103 are respectively located directly above each even or odd first electrode piece 102, and the plurality of upper second electrode pieces 103 are adjacent to each other. The lower second electrode layer includes a plurality of lower second electrode pieces 104, the plurality of lower second electrode pieces 104 are respectively located directly below each odd or even first electrode piece 102, and the plurality of lower second electrode pieces 104 are adjacent to each other. The lower second pole piece 104 and the upper second pole piece 103 are staggered relative to the first pole piece 102 in the vertical direction. The two layers of the stacked membrane strips 101, the first pole piece layer arranged between the two layers of the membrane strips 101, the upper second pole piece layer arranged on the upper surface of the upper membrane strip 101, and the lower second pole piece layer arranged on the lower surface of the lower membrane strip 101 are thermally compounded to form an integral structure, thereby forming the present unit strip 100. In the length direction of the present unit strip 100, between the upper second pole piece 103 and the lower second pole piece 104 adjacent to each other in the vertical direction is the folding position of the aforementioned unit strip 100, and the folding position is as follows Figure 8 At the position shown by the dotted box in .

[0038] In this embodiment, the upper second pole piece 103 and the lower second pole piece 104 have the same polarity, and are opposite to the polarity of the first pole piece layer 102. In one embodiment, the upper second pole piece 103 and the lower second pole piece 104 have the same pole piece size.

[0039] The stacking table 20 is arranged at the output end of the feeding device 10. The stacking table 20 is used to receive the unit sheet material belt 100 and reciprocate along the Z-shaped path to sequentially fold the unit sheet material belt 100 along the folding position of the unit sheet material belt 100. The unit sheet material belt 100 is sequentially folded at the folding position of the unit sheet material belt 100 by reciprocating along the Z-shaped path of the stacking table 20 until it is folded to the preset number of layers required for the battery cell, thereby forming a battery cell. Compared with the traditional stacking method, there is no need to transfer the pole piece (or stacking unit) through a robot arm, thereby improving the production efficiency of the battery cell.

[0040] In this embodiment, two stacking stations 20 are provided. After one stacking station folds the unit sheet material strip to the preset number of layers required for the battery cell, the other stacking station takes over the subsequent unit sheet material strip 100 to re-fold the subsequent unit sheet material strip 100. The two stacking stations can be alternately moved to the output end of the feeding device to fold the unit sheet material strip along the folding position, or the two stacking stations can alternately withdraw from the output end of the feeding device to form a avoidance, ensuring that after the folding of one stacking station is completed, the other stacking station takes over the subsequent unit sheet material strip 100 for folding.

[0041] Two pressing needle mechanisms 30 are arranged on the laminating platform 20, and the distance between the two pressing needle mechanisms 30 is the distance between two adjacent folding positions. Specifically, Figure 2 As shown, two pressing needle mechanisms 20 are respectively located on opposite sides of the stacking platform 20, and the pressing needle mechanisms 20 are used to press the folding position. When the stacking platform 20 moves back and forth along the Z-shaped path to fold the unit sheet material strip 100 once along the folding position, one pressing needle mechanism 30 presses one folding position, and the other pressing needle mechanism 30 presses another folding position adjacent to the aforementioned folding position to form a layer of battery cells. After the two pressing needle mechanisms 30 press the adjacent folding positions, the stacking platform 20 moves along the Z-shaped path, and when the subsequent folding position is folded to the pressing needle mechanism 30, the pressing needle mechanism 30 presses the subsequent folding position again, and the unit sheet material strip is folded in this reciprocating cycle until it is folded to the set number of layers required for the battery cell, and the production of the battery cell is completed.

[0042] The specific working process of the circulating composite lamination machine provided in this application is as follows:

[0043] See also Figure 3a As shown, when the stacking platform 20 moves along the Z-shaped path, the position of the feeding device 10 remains unchanged. The stacking platform 20 is connected to the unit sheet material belt 100, and the head end of the unit sheet material belt 100 is pressed by the right needle pressing mechanism 30. The stacking platform 20 moves from left to right (as shown in FIG. Figure 3a shown).

[0044] See also Figure 4a As shown, after the lamination table 20 moves to the right by a certain distance (such as Figure 4a The stacking platform 20 then moves a certain distance to the upper right (as shown in the dotted line position of the stacking platform). Figure 4a The solid line position of the stacking platform is shown in the figure) until the pressing needle mechanism 30 on the left can press another folding position adjacent to the previous folding position to form a layer of battery cells.

[0045] See also Figure 5a As shown, after the left needle pressing mechanism 30 presses another folding position, the stacking platform 20 moves a certain distance from right to left (such as Figure 5a The stacking table shown moves from the dotted line position to the solid line position).

[0046] See also Figure 6a As shown, after the laminating platform 20 moves a certain distance from right to left, the laminating platform 20 moves a certain distance to the upper left (as shown in FIG. Figure 6a As shown, the stacking platform moves from the dotted line position to the solid line position) until the next folding position adjacent to the previous folding position can be pressed by the pressing needle mechanism 30 on the right side of the stacking platform 20, so as to form a two-layer battery cell. After that, the stacking platform 20 moves from left to right and repeats the previous action, and the unit sheet strip is folded in such a reciprocating cycle. When the number of layers required for the battery cell is folded, the production of the battery cell is completed.

[0047] After folding to the required number of layers of the battery cell, it is necessary to cut between the battery cell and the unit sheet material belt 100 conveyed by the conveying device 10. Therefore, the circulating composite laminating machine provided by the present application also includes: a cutting mechanism (not shown in the figure), which is used to cut the unit sheet material belt along the last folding position when the unit sheet material belt is folded to the preset number of layers. The cutting mechanism is specifically arranged between the output end of the conveying device 10 and the laminating table 20, or, arranged at the output end of the conveying device 10, or, arranged on the side of the laminating table 20.

[0048] In this embodiment, see Figure 3b , Figure 4b , Figure 5b as well as Figure 6b As shown, each pressing needle mechanism 30 on both sides of the stacking platform includes: two pressing needle assemblies, and the two pressing needle assemblies are respectively located at the two ends of one side of the stacking platform. Each pressing needle assembly includes: a pressing needle 31, a pressing needle up and down driving unit, and a pressing needle rotation driving unit. The pressing needle up and down driving assembly is used to drive the pressing needle 31 to move downward in a direction perpendicular to the stacking platform 20 to press the unit sheet material strip 100 at the folding position, or drive the pressing needle 31 to move upward in a direction perpendicular to the stacking platform 20 to release the unit sheet material strip 100 at the folding position. The pressing needle rotation driving unit is used to drive the pressing needle 31 to rotate toward the outside of the stacking platform after moving upward to avoid the unit sheet material strip 100 to be folded. After a layer of battery cells is folded, the pressing needle up and down driving unit drives the pressing needle to move upward in a direction perpendicular to the stacking platform to release the unit sheet material strip at the folding position, and then the pressing needle rotation driving unit drives the pressing needle to rotate to avoid the folded unit sheet material strip, which will not affect the folding process.

[0049] like Figure 3b As shown, when positioning the leading end of the unit sheet material belt 100, the left press pin 31 remains stationary, and the right press pin 31 is first driven by the press pin rotation drive unit to move to the inner side of the lamination table ( Figure 3bThen, the pressing needle 31 on the right side moves downward under the driving of the pressing needle up and down driving unit, thereby pressing the folded position of the first end of the unit sheet material belt 100 conveyed by the feeding device 10. Figure 4b As shown, the left press pin 31 is driven by the press pin rotation drive unit to rotate toward the inside of the stacking platform, and at the same time, the right press pin is driven by the press pin rotation drive unit to rotate toward the outside of the stacking platform to release the right folding position. Afterwards, the left press pin 31 moves downward under the drive of the press pin up and down drive unit to press the left folding position. Figure 5b As shown, the pressing pins 31 on the left and right sides are driven by the pressing pin rotation driving unit to move to the outside of the lamination platform. Figure 6b As shown, the left press pin 31 moves upward under the drive of the press pin up and down driving unit, and after moving upward, it rotates toward the outside of the stacking platform under the drive of the press pin rotation driving unit to avoid the unit sheet material belt 100. After the stacking platform moves a certain distance to the upper left, the right press pin 31 rotates toward the inside of the stacking platform under the drive of the press pin rotation driving unit, and moves downward under the drive of the press pin up and down driving unit to press the folding position on this side.

[0050] See also Figure 7a and Figure 7b As shown, when the number of layers folded by the stacking platform 20 reaches the preset number, another stacking platform 20' takes over the stacking platform 20 that has already stacked the cells, and the stacking platform 20 that has already stacked the cells continues to move to the right, while the other stacking platform 20' also moves to the right to a predetermined position, and the right side pressure needle of the other stacking platform 20' rotates and presses down toward the inside of the stacking platform, at which time, the cutting mechanism 21 set on the side of the stacking platform rises to cut the unit sheet material strip 100. The other stacking platform 20' restarts folding the unit sheet material strip 100 according to the steps of the previous stacking platform 20. The cut cells are taken out by the material transfer robot for subsequent processes.

[0051] In the subsequent process of the battery cell, the layers of the folded battery cell are relatively loose, and the battery cell needs to be hot pressed to complete the production of the finished battery cell. Fig. 9 As shown, the cyclic composite stacking machine provided by the present application also includes: a hot pressing device 50, which is used to hot press the battery cells to compress the loose battery cells. Specifically, the hot pressing device 50 includes two hot pressing plates that can move relative to each other to compress the battery cells, or can move toward each other to release the battery cells. The two hot pressing plates move relative to each other to hot press the battery cells to prevent the finished battery cells from being too loose, thereby improving the yield rate of the finished battery cells.

[0052] like Fig.10As shown, the circulating composite laminating machine provided in this embodiment also includes: a laminating table driving mechanism 70 for driving the laminating table 20 to reciprocate along a Z-shaped path. The laminating table driving mechanism 70 includes: a Z-shaped combined guide rail with a Z-shaped path, a slider 71 that can slide back and forth along the Z-shaped path, and a power source for providing power for the sliding of the slider. The laminating table 20 is fixed on the slider to achieve reciprocating movement of the Z-shaped path under the drive of the power source. It can be understood that the Z-shaped combined guide rail includes a first guide rail 72, a second guide rail 73 and a third guide rail 74 connected in a Z-shape, the first guide rail 72 and the second guide rail 73 are arranged parallel to each other, and the third guide rail 74 is connected between the first guide rail 72 and the second guide rail 73 to form a Z shape. The power source includes a first power source for driving the slider 71 to slide back and forth on the first guide rail 72, a second power source for driving the slider 71 to slide back and forth on the second guide rail 73, and a third power source for driving the slider 71 to slide back and forth on the third guide rail 74. The first power source drives the slider 71 to move from left to right on the first guide rail 72, and is replaced by the third guide rail 74; the third power source drives the slider 71 to move from one end close to the first guide rail 72 to the other end close to the second guide rail 73 on the third guide rail 74, and is replaced by the second guide rail 73; the second power source drives the slider 71 to move from left to right on the second guide rail 74; then, it moves in the opposite direction, so that the reciprocating movement of the stacking table 20 along the Z-shaped path can be realized.

[0053] The circulating composite laminating machine provided in this embodiment further includes: a unit sheet material strip making device 40 disposed at the input end of the feeding device 10, the unit sheet material strip making device 40 is used to make the unit sheet material strip 100 and output the made unit sheet material strip 100 to the input end of the feeding device. Figure 1 As shown, the unit sheet material strip manufacturing device 40 includes: two diaphragm material strip unwinding components 41, a first pole piece unwinding component 43, a first cutting component 431, an upper second pole piece unwinding component 42, a second cutting component 421, a lower second pole piece unwinding component 44, and a third cutting component 441. The first pole piece layer unwinding component 43 is located between the two diaphragm material strip unwinding components 41, the upper second pole piece layer unwinding component 42 is located above the upper diaphragm material strip unwinding component 41, the lower second pole piece layer unwinding component 44 is located below the lower diaphragm material strip unwinding component 41, the first cutting component 421 is located at the output end of the upper second pole piece layer unwinding component 42, and the second cutting component 441 is located at the output end of the lower second pole piece layer unwinding component 44.

[0054] The two diaphragm material strip unwinding components 41 are used to unwind two layers of diaphragm material strips 101, the first pole piece layer unwinding component 43 is used to roll the first pole piece between the two layers of diaphragm material strips, and the first cutting component 431 is used to cut the first pole piece roll to a fixed length to form a plurality of first pole pieces 102, and arrange the plurality of first pole pieces 102 in a straight line array along the length direction of the unit sheet material strip 100 between the two layers of diaphragm material strips 101. The second pole piece unwinding assembly 42 is used to unwind the upper second pole piece coil to the upper surface of the upper diaphragm material strip 101, and the second cutting assembly 421 is used to cut the upper second pole piece coil to a fixed length to form a plurality of upper second pole pieces 103, and make the upper second pole piece 103 directly above each even-numbered or odd-numbered first pole piece 102; the lower second pole piece layer unwinding assembly 44 is used to unwind the lower second pole piece coil to the lower surface of the lower diaphragm material strip, and the third cutting assembly 441 is used to cut the lower second pole piece coil to a fixed length to form a plurality of lower second pole pieces 104, and make the lower second pole piece 104 directly below each odd-numbered or even-numbered first pole piece 102. The upper second pole piece unwinding assembly 42 and the lower second pole piece unwinding assembly 44 unwind materials at intervals, that is, the upper second pole piece unwinding assembly 42 unwinds first and is cut to a fixed length by the second cutting assembly 421, and then the upper second pole piece unwinding assembly 42 stops unwinding, and at the same time, the lower second pole piece unwinding assembly 44 unwinds and is cut to a fixed length by the third cutting assembly 441, and the cycle continues. Thus, the upper second pole piece and the lower second pole piece are arranged in a staggered manner relative to the first pole piece 102 in the length direction of the unit sheet strip 100.

[0055] In other embodiments, the unit sheet material strip production device 40 also includes: another first pole piece unwinding component 43' and another first cutting component 431'. The other first pole piece unwinding component 43' and the first pole piece unwinding component 43 also unwind the first pole piece roll in an interval unwinding manner, that is, the first pole piece unwinding component 43 is first unwound and cut to a fixed length by the first cutting component 431, and then the first pole piece unwinding component 43 stops unwinding. At the same time, the other first pole piece unwinding component 43' is unwound and cut to a fixed length by another first cutting component 431', and this cycle is repeated to form the first pole piece 102.

[0056] In one embodiment, the unit sheet material strip manufacturing device 40 also includes a tension control system to respectively control the tension of the two layers of diaphragm material strips, the first pole piece layer, the upper second pole piece layer and the lower second pole piece layer to ensure that the diaphragm and the pole piece are not offset during the thermal composite process, so as to improve the thermal composite quality of the unit sheet material strip 100.

[0057] Continue to see Figure 1As shown, the unit sheet material strip manufacturing device 40 also includes: a pair of hot pressing rollers 48, the pair of hot pressing rollers 48 are used to heat-combine the two stacked layers of diaphragm material strips, the first pole piece layer arranged between the two layers of diaphragm material strips, the upper second pole piece layer arranged on the upper surface of the upper diaphragm material strip, and the lower second pole piece layer arranged on the lower surface of the lower diaphragm material strip into a whole by rolling to obtain the aforementioned unit sheet material strip 100.

[0058] In one embodiment, the above-mentioned unit sheet material strip manufacturing device 40 also includes: a pole piece plastic film unwinding mechanism 45, a pole piece plastic film rewinding mechanism 46, a guide mechanism 47 and a heating mechanism 48'. Specifically, a pole piece plastic film unwinding mechanism 45, a pole piece plastic film rewinding mechanism 46, a guide mechanism 47 and a heating mechanism 48' are respectively arranged on the upper surface of the upper second pole piece layer and the lower surface of the lower second pole piece layer. The pole piece plastic film unwinding mechanism 45 is used to unwind the pole piece plastic film, and the pole piece plastic film rewinding mechanism 46 is used to rewind the pole piece plastic film unwound by the pole piece plastic film unwinding mechanism. The pole piece plastic film is specifically a PET Mylar film, which is used to pull and position the multiple upper second pole pieces 103 and the multiple lower second pole pieces 104 respectively, to prevent the upper second pole piece 103 and the multiple lower second pole pieces 104 from being offset, thereby affecting the quality of the subsequent battery cells. The guide mechanism 47 is specifically a guide roller to guide the pole piece plastic film. The heating mechanism 48' heats the electrode and the diaphragm according to the heating temperature required for the electrode and the diaphragm to be combined, and the heating temperature is adjustable.

[0059] In summary, in the circulating composite laminating machine provided by the present application, the unit sheet material belt is conveyed to the laminating table under the traction and conveyance of the feeding device. While the laminating table moves along the Z-shaped path, a pressing needle mechanism on the laminating table presses a folding position, and another pressing mechanism presses the folding position adjacent thereto, so as to fold the unit sheet material belt along the folding position to produce the battery cell. Compared with the traditional stacking method, there is no need to transfer the pole piece (or laminating unit) by a manipulator, which shortens the process and improves the laminating efficiency. At the same time, the hot pressing device can be used to hot press the battery cell, which can also ensure that the battery cell is not loose, thereby improving the yield rate of the battery cell.

[0060] The above specific examples are used to illustrate the present invention, which is only used to help understand the present invention and is not intended to limit the present invention. For those skilled in the art, according to the concept of the present invention, some simple deductions, modifications or substitutions can be made.

Claims

1. A circulating composite lamination machine, characterized in that: include: A material conveying device, the material conveying device comprising a pair of traction rollers, the pair of traction rollers being used to convey the unit sheet material strip to the lamination table; The unit sheet material strip has a plurality of folding positions evenly distributed along its length direction; A laminating device, comprising: at least one laminating platform and two pressing needle mechanisms, wherein the at least one laminating platform is located at the output end of the feeding device, and the two pressing needle mechanisms are arranged on the laminating platform; the laminating platform is used to receive the unit sheet material belt and reciprocate along a Z-shaped path to fold the unit sheet material belt along the multiple folding positions in sequence; One pressing needle mechanism presses one folding position, and another pressing needle mechanism presses another folding position adjacent to the one folding position, so as to form a layer of battery cells; The cycle is repeated repeatedly until the preset number of layers required for the battery cell is reached; The distance between the two needle pressing mechanisms is the distance between two adjacent folding positions; The unit sheet material strip comprises: two layers of diaphragm material strips stacked together, a first pole piece layer disposed between the two layers of diaphragm material strips, an upper second pole piece layer disposed on the upper surface of the upper diaphragm material strip, and a lower second pole piece layer disposed on the lower surface of the lower diaphragm material strip; The first electrode sheet layer includes a plurality of first electrode sheets arranged in a straight line array along the length direction of the unit sheet material strip; the upper second electrode sheet layer includes a plurality of upper second electrode sheets, and the plurality of upper second electrode sheets are respectively located directly above each even-numbered position or each odd-numbered position of the first electrode sheet; the lower second electrode sheet layer includes a plurality of lower second electrode sheets, and the plurality of lower second electrode sheets are respectively located directly below each first electrode sheet without an upper second electrode sheet disposed directly above it; along the length direction of the unit sheet material strip, the folding position is formed between adjacent upper second electrode sheets and lower second electrode sheets.

2. The circulating composite lamination machine according to claim 1, characterized in that: There are two stacking stations. After one stacking station folds the unit sheet material belt to the preset number of layers required for the battery cell, the other stacking station takes over the unit sheet material belt to re-fold the unit sheet material belt. The two stacking stations can be moved alternately to the output end of the conveying device to fold the unit sheet material belt along the folding position, or the two stacking stations can be alternately withdrawn from the output end of the conveying device to form an avoidance.

3. The circulating composite lamination machine according to claim 1, characterized in that: The lamination device further comprises: a cutting mechanism, which is used to cut the unit sheet material strip along the last folding position when the unit sheet material strip is folded to a preset number of layers.

4. The circulating composite lamination machine according to claim 1, characterized in that: Also includes: A hot pressing device is used to perform hot pressing on the battery cell to obtain a finished battery cell.

5. The circulating composite lamination machine according to claim 4, characterized in that: The hot pressing device comprises: two hot pressing plates which can move relatively to approach each other, or can move towards each other to move away from each other. The two hot pressing plates move relatively to perform hot pressing on the battery cells, and move towards each other to release the finished battery cells after hot pressing.

6. The circulating composite lamination machine according to claim 1, characterized in that: The circulating composite lamination machine also includes: a unit sheet material strip making device arranged at the input end of the feeding device, the unit sheet material strip making device is used to make unit sheet material strips and output the made unit sheet material strips to the input end of the feeding device; the unit sheet material strip making device includes: two diaphragm material strip unwinding assemblies, a first pole piece unwinding assembly, a first cutting assembly, an upper second pole piece unwinding assembly, a second cutting assembly, a lower second pole piece unwinding assembly, and a third cutting assembly; the two diaphragm material strip unwinding assemblies are used to release two layers of continuous diaphragm material strips; the first pole piece unwinding assembly is located between the two diaphragm material strip unwinding assemblies, the first pole piece unwinding assembly is used to release the first pole piece coil between the two layers of diaphragm material strips, the first cutting assembly is used to cut the first pole piece coil to a fixed length to form a plurality of first pole pieces, and make the plurality of first The pole pieces are arranged in a straight line array along the length direction of the unit sheet material strip between the two layers of diaphragm material strips; the upper second pole piece unwinding assembly is located above the upper diaphragm material strip unwinding assembly, and the upper second pole piece unwinding assembly is used to unwind the upper second pole piece coil to the upper surface of the upper diaphragm material strip, and the second cutting assembly is used to cut the upper second pole piece coil to a fixed length to form the plurality of upper second pole pieces, and make the upper second pole piece directly above each even or odd first pole piece; the lower second pole piece unwinding assembly is located below the lower diaphragm material strip unwinding assembly, and the lower second pole piece unwinding assembly is used to unwind the lower second pole piece coil to the lower surface of the lower diaphragm material strip, and the third cutting assembly is used to cut the lower second pole piece coil to a fixed length to form the plurality of lower second pole pieces, and make the lower second pole piece directly below each odd or even first pole piece.

7. The circulating composite lamination machine according to claim 6, characterized in that: The unit sheet material strip production device also includes: a pair of hot pressing rollers, which are used to thermally composite the two stacked layers of diaphragm material strips, the first pole piece layer arranged between the two layers of diaphragm material strips, the upper second pole piece layer arranged on the upper surface of the upper diaphragm material strip, and the lower second pole piece layer arranged on the lower surface of the lower diaphragm material strip into a whole by rolling to obtain the unit sheet material strip.

8. The circulating composite lamination machine according to claim 1, characterized in that: Each of the pressing needle mechanisms comprises: two pressing needle assemblies, the two pressing needle assemblies are respectively located at the two ends of one side of the stacking platform, and each of the pressing needle assemblies comprises: a pressing needle, a pressing needle up and down driving unit, and a pressing needle rotation driving unit; the pressing needle up and down driving unit is used to drive the pressing needle to move downward in a direction perpendicular to the stacking platform to press the unit sheet material strip at the folding position, or drive the pressing needle to move upward in a direction perpendicular to the stacking platform to release the unit sheet material strip at the folding position; the pressing needle rotation driving unit is used to drive the pressing needle to rotate toward the outside of the stacking platform after moving upward to avoid the unit sheet material strip to be folded.

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