Composite lamination production line and composite lamination method

Abstract

The present invention relates to the technical field of lithium batteries, and in particular to a composite lamination production line and a composite lamination method, comprising a positive electrode semi-composite device, a negative electrode semi-composite device, a positive electrode conveying device, a negative electrode conveying device, a positive electrode transfer mechanism, a negative electrode transfer mechanism, a lamination table, a positive electrode visual positioning mechanism, a negative electrode visual positioning mechanism, a lamination manipulator, a coating device, a hot pressing machine and a trimming device, wherein the positive electrode visual positioning mechanism and the negative electrode visual positioning mechanism are both electrically connected to the lamination table. The positive electrode visual positioning mechanism and the negative electrode visual positioning mechanism are used to accurately position the position of the positive electrode sheet in the positive composite sheet b and the position of the negative electrode sheet in the negative composite sheet a respectively, and then N+1 negative composite sheets a and N positive composite sheets b are stacked according to the lamination rule to improve the alignment accuracy of the positive electrode sheet and the negative electrode sheet in the battery cell, thereby improving the quality of the composite laminated battery cell, and the lamination efficiency is high, which improves the efficiency of producing the composite laminated battery cell.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium batteries, and in particular to a composite lamination production line and a composite lamination method. Background Art

[0002] Traditional laminated cells are mainly made by three lamination methods, namely Z-shaped lamination, bag-making lamination and composite lamination. Among them, Z-shaped lamination is a cell made by repeatedly laminating the positive and negative electrodes and separating them with a diaphragm in the middle. This type of cell has a low impedance, but the electrodes are easily misaligned and cause short circuits. The battery safety of this type of cell is poor. Bag-making lamination generally aligns the upper and lower sides of the positive electrode with the diaphragm, and then heat presses the four sides to form a positive electrode bag, and then repeatedly and alternately laminates with the negative electrode. This type of cell has a low impedance, but does not completely solve the problem of misalignment of the positive and negative electrodes. Composite lamination is a cell made by hot pressing and compounding the lower diaphragm, the negative electrode, the upper diaphragm and the positive electrode in a cycle. The efficiency of producing cells by this lamination method is relatively low, just like Z-shaped lamination and bag-making lamination. It is difficult to meet the rapidly growing demand for power batteries in the current new energy market, and it is difficult to ensure the accurate alignment of the positive and negative electrodes. Therefore, the defects are very obvious, and a solution is urgently needed. Summary of the invention

[0003] In order to solve the above technical problems, the purpose of the present invention is to provide a composite lamination production line and a composite lamination method with accurate alignment of positive and negative electrodes, high battery cell production efficiency and good quality.

[0004] In order to achieve the above object, the present invention adopts the following technical solution:

[0005] A composite lamination production line, comprising a positive electrode semi-composite device for compounding a positive electrode sheet with a separator, a negative electrode semi-composite device for compounding a negative electrode sheet with a separator, a positive electrode conveying device arranged at the discharge end of the positive electrode semi-composite device, a negative electrode conveying device arranged at the discharge end of the negative electrode semi-composite device, a positive electrode transfer mechanism for transferring a positive composite sheet b formed by the positive electrode semi-composite device to the positive electrode conveying device, a negative electrode transfer mechanism for transferring a negative composite sheet a formed by the negative electrode semi-composite device to the negative electrode conveying device, a lamination table movably arranged between the negative electrode conveying device and the positive electrode conveying device, and a positive electrode conveying device arranged at the discharge end of the negative electrode conveying device. A positive electrode visual positioning mechanism is arranged on the negative electrode conveying device and is used to visually position the positive composite sheet b conveyed by the positive electrode conveying device, a negative electrode visual positioning mechanism is arranged on the negative electrode conveying device and is used to visually position the negative composite sheet a conveyed by the negative electrode conveying device, a stacking robot is used to transfer the negative composite sheet a and the positive composite sheet b to the stacking table for stacking to form an initial battery cell, a coating device is used to coat the initial battery cell to form a battery cell, a heat pressing machine is used to heat press the battery cell and a trimming device is used to trim the battery cell after heat pressing, and the positive electrode visual positioning mechanism and the negative electrode visual positioning mechanism are both electrically connected to the stacking table.

[0006] Furthermore, the coating device includes a cover storage device for storing the bottom cover c and the top cover d and an end cover visual positioning mechanism arranged in the cover storage device and used for visually positioning the bottom cover c and / or the top cover d. The stacking robot transfers the bottom cover c, the negative composite sheet a, the positive composite sheet b and the top cover d to the stacking table for stacking in order to form a battery cell, and the end cover visual positioning mechanism is electrically connected to the stacking table.

[0007] Furthermore, the coating device is a coating machine, and the coating machine is located between the lamination table and the hot pressing machine.

[0008] Furthermore, the positive electrode semi-composite device and / or the negative electrode semi-composite device include a semi-composite frame, a pre-pressing roller rotatably arranged on the semi-composite frame, a semi-composite hot pressing mechanism arranged at the discharge end of the pre-pressing roller, a vacuum traction mechanism arranged at the discharge end of the semi-composite hot pressing mechanism and used for pulling the diaphragm to move, a cutting mechanism arranged at the discharge end of the vacuum traction mechanism and used for cutting the diaphragm, and a semi-composite conveying device arranged at the discharge end of the cutting mechanism.

[0009] Furthermore, a pre-storage mechanism is provided between the vacuum traction mechanism and the cutting mechanism.

[0010] Furthermore, the trimming device includes a trimming table, a mobile driving mechanism for driving the trimming table to move, a laser cutting machine located above the trimming table, a trimming visual positioning mechanism located above the trimming table, and a suction device installed on the trimming table and used to absorb waste materials, and the trimming visual positioning mechanism is electrically connected to the mobile driving mechanism.

[0011] Furthermore, the composite lamination production line also includes a first material transfer robot and a circuit testing device for performing circuit testing on the trimmed battery cells, wherein the first material transfer robot is used to transfer the trimmed battery cells to the circuit testing device or output the battery cells tested by the circuit testing device.

[0012] Furthermore, the composite lamination production line also includes a first product storage, a weighing machine, a second material transfer robot, a second product storage, a coding device and a packaging machine, the first material transfer robot is used to transfer the defective battery cells detected by the circuit testing device to the first product storage, the second material transfer robot is used to transfer the good battery cells detected by the circuit testing device to the weighing machine, the first material transfer robot and the second material transfer robot are both electrically connected to the circuit testing device, the second material transfer robot transfers the defective battery cells weighed by the weighing machine to the second product storage, transfers the good battery cells weighed by the weighing machine to the coding device, or transfers the battery cells coded by the coding device to the packaging machine, and the second material transfer robot is electrically connected to the weighing machine.

[0013] The present invention also provides a composite lamination method, comprising the following steps:

[0014] Step 1: pre-press the positive electrode sheet on the diaphragm so that the positive electrode sheet is attached to the diaphragm, hot-press the positive electrode sheet on the diaphragm by hot pressing, and cut the diaphragm with the positive electrode sheet hot pressed into a single dense positive composite sheet b; pre-press the negative electrode sheet on the diaphragm so that the negative electrode sheet is attached to the diaphragm, hot-press the negative electrode sheet on the diaphragm by hot pressing, and cut the diaphragm with the negative electrode sheet hot pressed into a single dense negative composite sheet a;

[0015] Step 2: Visually locate the position of the bottom cover c, the position of the negative electrode sheet in the negative composite sheet a on the diaphragm, the position of the positive electrode sheet in the positive composite sheet b on the diaphragm, and the position of the top cover d by means of CCD visual positioning;

[0016] Step 3: The stacking table adjusts the position according to the result of the CCD visual positioning of the bottom cover c, and the stacking robot picks up the bottom cover c to the accurate position of the stacking table;

[0017] Step 4: The stacking table adjusts the position of the negative electrode sheet in the negative composite sheet a according to the CCD visual positioning result, and the stacking robot picks up the negative composite sheet a to the accurate position of the bottom cover c carried by the stacking table;

[0018] Step 5: The stacking table adjusts the position of the positive electrode sheet in the positive composite sheet b according to the CCD visual positioning result, and the stacking robot picks up the positive composite sheet b to the accurate position of the negative composite sheet a carried by the stacking table, so that the positive electrode sheet in the positive composite sheet b is aligned with the negative electrode sheet in the negative composite sheet a;

[0019] Step 6, repeating steps 4 and 5 to stack in a loop, alternately stacking N+1 negative composite sheets a and N positive composite sheets b, so that the last negative composite sheet a is at the top;

[0020] Step 7: The stacking table adjusts the position of the top cover d according to the result of the CCD visual positioning, and the stacking robot picks up the top cover d to the exact position of the last negative composite sheet a carried by the stacking table to form a preliminary formed battery cell;

[0021] Step 8: hot pressing the preliminarily formed battery cell by a hot pressing machine to form a dense battery cell;

[0022] Step nine, placing the hot pressed and formed battery cell on the trimming table, photographing the hot pressed and formed battery cell by means of CCD visual positioning, and adjusting the position of the trimming table according to the photographed result of the hot pressed and formed battery cell by CCD visual positioning, while the laser cutting machine cuts the excess diaphragm waste around the battery cell to form a composite laminated battery cell, and the cut diaphragm waste is sucked by the suction device;

[0023] Step 10: Conducting circuit testing on the composite laminated cells to exclude composite laminated cells that fail the circuit testing;

[0024] Step 11, weigh and measure the composite laminated cells that have passed the circuit test to exclude composite laminated cells with incorrect number of laminates;

[0025] Step 12: Coding and packaging the qualified composite laminated battery cells after weight measurement to form the final battery cells.

[0026] The present invention also provides a composite lamination method, comprising the following steps:

[0027] Step 1: pre-press the positive electrode sheet on the diaphragm so that the positive electrode sheet is attached to the diaphragm, hot-press the positive electrode sheet on the diaphragm by hot pressing, and cut the diaphragm with the positive electrode sheet hot pressed into a single dense positive composite sheet b; pre-press the negative electrode sheet on the diaphragm so that the negative electrode sheet is attached to the diaphragm, hot-press the negative electrode sheet on the diaphragm by hot pressing, and cut the diaphragm with the negative electrode sheet hot pressed into a single dense negative composite sheet a;

[0028] Step 2: Visually locate the position of the negative electrode sheet on the diaphragm in the negative composite sheet a and the position of the positive electrode sheet on the diaphragm in the positive composite sheet b by means of CCD visual positioning;

[0029] Step 3: The stacking table adjusts the position of the negative electrode sheet in the negative composite sheet a according to the CCD visual positioning result, and the stacking robot picks up the negative composite sheet a to the accurate position of the stacking table;

[0030] Step 4: The stacking table adjusts the position of the positive electrode sheet in the positive composite sheet b according to the CCD visual positioning result, and the stacking robot picks up the positive composite sheet b to the accurate position of the negative composite sheet a carried by the stacking table, so that the positive electrode sheet in the positive composite sheet b is aligned with the negative electrode sheet in the negative composite sheet a;

[0031] Step 5, repeating steps 3 and 4 to stack in a loop, alternately stacking N+1 negative composite sheets a and N positive composite sheets b, so that the last negative composite sheet a is on the top surface, to form an initial battery cell;

[0032] Step 6: The coating machine coats the primary cell with the diaphragm to form a preliminarily formed cell;

[0033] Step 7: hot pressing the preliminarily formed battery cell by a hot pressing machine to form a dense battery cell;

[0034] Step 8: Place the hot pressed battery cell on the trimming table, and photograph the hot pressed battery cell by CCD visual positioning. The trimming table adjusts the position of the photographed battery cell according to the CCD visual positioning. At the same time, the laser cutting machine cuts the excess diaphragm waste around the battery cell to form a composite laminated battery cell, and the cut diaphragm waste is sucked by the suction device.

[0035] Step nine, performing circuit testing on the composite laminated battery cells to exclude composite laminated battery cells that fail the circuit test;

[0036] Step 10, weigh and measure the composite laminated cells that have passed the circuit test to exclude composite laminated cells with incorrect number of laminates;

[0037] Step 11: Coding and packaging the qualified composite laminated battery cells after weight measurement to form the final battery cells.

[0038] The beneficial effects of the present invention are as follows: the present invention uses a positive electrode visual positioning mechanism and a negative electrode visual positioning mechanism to accurately position the position of the positive electrode sheet in the positive composite sheet b and the position of the negative electrode sheet in the negative composite sheet a respectively, and then stacks N+1 negative composite sheets a and N positive composite sheets b according to the stacking rule to form an initial battery cell, and finally forms a battery cell by coating and hot pressing the initial battery cell, thereby improving the alignment accuracy of the positive electrode sheet and the negative electrode sheet in the battery cell, thereby improving the quality of the composite laminated battery cell, making the composite laminated battery cell safe to use and having a long service life, and having high stacking efficiency, thereby improving the efficiency of producing composite laminated battery cells. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a top view of the first embodiment of the present invention.

[0040] Figure 2 It is a structural schematic diagram of the semi-composite hot pressing mechanism of the present invention.

[0041] Figure 3 It is a schematic diagram of the structure of the composite laminated battery cell in Example 1.

[0042] Figure 4 It is a top view of the second embodiment of the present invention.

[0043] Figure 5 It is a schematic diagram of the structure of the composite laminated battery cell in Example 2.

[0044] Description of reference numerals:

[0045] 1. Positive electrode semi-composite device; 11. Semi-composite frame; 12. Pre-pressing roller; 13. Semi-composite hot pressing mechanism; 131. Heat-conducting conveyor belt; 132. Hot pressing roller; 14. Vacuum traction mechanism; 15. Cutting mechanism; 16. Semi-composite conveying device; 17. Pre-storage mechanism; 171. Pre-storage roller; 172. Lifting drive; 2. Negative electrode semi-composite device; 3. Positive electrode conveying device; 31. Negative electrode conveying device; 4. Positive electrode transfer mechanism; 41. Negative electrode transfer mechanism; 5. Cap storage device; 51. End cap visual positioning mechanism; 6. Lamination table; 61. Lamination machine manipulator; 62, positioning table; 63, rotation device; 7, positive electrode visual positioning mechanism; 71, negative electrode visual positioning mechanism; 8, hot pressing machine; 80, gluing device; 81, first material transfer robot; 82, circuit testing device; 83, first product storage; 84, weighing machine; 85, second material transfer robot; 86, second product storage; 87, coding device; 88, packaging machine; 9, trimming device; 91, trimming table; 92, mobile drive mechanism; 93, laser cutting machine; 94, trimming visual positioning mechanism; 95, suction device; 96, coating machine. DETAILED DESCRIPTION

[0046] In order to facilitate the understanding of those skilled in the art, the present invention is further described below in conjunction with embodiments and drawings. The contents mentioned in the implementation modes are not intended to limit the present invention.

[0047] Embodiment 1.

[0048] like Figures 1 to 3As shown, the present invention provides a composite lamination production line, which includes a positive electrode semi-composite device 1 for compounding a positive electrode sheet with a diaphragm, a negative electrode semi-composite device 2 for compounding a negative electrode sheet with a diaphragm, a positive electrode conveying device 3 arranged at the discharge end of the positive electrode semi-composite device 1, a negative electrode conveying device 31 arranged at the discharge end of the negative electrode semi-composite device 2, a positive electrode transfer mechanism 4 for transferring the positive composite sheet b formed by the positive electrode semi-composite device 1 to the positive electrode conveying device 3, a negative electrode transfer mechanism 41 for transferring the negative composite sheet a formed by the negative electrode semi-composite device 2 to the negative electrode conveying device 31, a lamination table 6 movably arranged between the negative electrode conveying device 31 and the positive electrode conveying device 3, a positive electrode visual positioning mechanism 7 arranged at the positive electrode conveying device 3 and used for visually positioning the positive composite sheet b conveyed by the positive electrode conveying device 3, a negative electrode visual positioning mechanism 71 arranged at the negative electrode conveying device 31 and used for visually positioning the negative composite sheet a conveyed by the negative electrode conveying device 31, and a lamination table 6 movably arranged between the negative electrode conveying device 31 and the positive electrode conveying device 3. The invention also includes a stacking robot 61 for transferring the negative composite sheet a and the positive composite sheet b to the stacking platform 6 for stacking to form an initial battery cell, a coating device for coating the initial battery cell to form a battery cell, a heat pressing machine 8 for hot pressing the battery cell, and a trimming device 9 for trimming the battery cell after hot pressing. The positive electrode visual positioning mechanism 7 and the negative electrode visual positioning mechanism 71 are both electrically connected to the stacking platform 6. Specifically, the coating device includes a cover storage device 5 for storing the bottom cover c and the top cover d and a device The end cap visual positioning mechanism 51 is placed in the cap storage device 5 and is used to visually position the bottom cap c or / and the top cap d. The stacking robot 61 transfers the bottom cap c, the negative composite sheet a, the positive composite sheet b and the top cap d to the stacking table for stacking to form a battery cell in the stacking order. The end cap visual positioning mechanism 51 is electrically connected to the stacking table 6; preferably, in order to facilitate the operator to add the bottom cap c or the top cap d to the cap storage device 5, the cap storage device 5 is located on the side of the negative electrode conveying device 31 away from the positive electrode conveying device 3. In this embodiment, the upper and lower surfaces of the separator are coated with glue or adhesive layers.

[0049] In actual operation, the positive electrode semi-composite device 1 presses the positive electrode sheet onto the diaphragm and forms a dense positive composite sheet b, the negative electrode semi-composite device 2 presses the negative electrode sheet onto the diaphragm and forms a dense negative composite sheet a, the positive electrode transfer mechanism 4 transfers the positive composite sheet b to the positive electrode conveying device 3, the negative electrode transfer mechanism 41 transfers the negative composite sheet a to the negative electrode conveying device 31, the end cap visual positioning mechanism 51 visually locates the position of the bottom cap c in the cap storage device 5, and the end cap visual positioning mechanism 51 feeds back the result of visual positioning to the stacking table 6, so that the stacking table 6 rotates to the set The stacking robot 61 picks up the bottom cover c on the cover storage device 5 and places it on the stacking table 6. The positive electrode visual positioning mechanism 7 visually positions the positive electrode sheet on the positive composite sheet b conveyed by the positive electrode conveying device 3. The negative electrode visual positioning mechanism 71 visually positions the negative electrode sheet on the negative composite sheet a conveyed by the negative electrode conveying device 31. The negative electrode visual positioning mechanism 71 and the positive electrode visual positioning mechanism 7 feed back the results of visual positioning to the stacking table 6 in sequence. The stacking robot 61 positions the negative composite sheet a conveyed by the negative electrode conveying device 31. After the sheet a is picked up and placed on the bottom cover c of the stacking table 6, the stacking robot 61 picks up the positive composite sheet b conveyed by the positive electrode conveying device 3 and places it on the positive composite sheet b on the stacking table 6. In the manner of cyclic alternating stacking of the negative composite sheets a and the positive composite sheets b, after the stacking robot 61 alternately stacks N+1 negative composite sheets a and N positive composite sheets b, the negative composite sheet a is at the topmost surface, and the end cover visual positioning mechanism 51 visually positions the top cover d in the cover storage device 5. The end cover visual positioning mechanism 51 feeds back the result of visual positioning to the stacking table 6, so that the stacking table 6 rotates to the set position. The stacking robot 61 picks up the top cover d on the cover storage device 5 and puts it on the stacking table 6, so that the top cover d is located on the top layer of the negative composite sheet a to form a battery cell. The stacking robot 61 transfers the battery cell on the stacking table 6 to the hot pressing machine 8, and the hot pressing machine 8 presses the battery cell into shape to form a dense battery cell. The stacking robot 61 transfers the pressed battery cell to the trimming device 9, and the trimming device 9 trims the pressed battery cell, which refers to trimming the excess diaphragm edge in the pressed battery cell to form a composite stacked battery cell. The present invention uses the positive electrode visual positioning mechanism 7, the negative electrode visual positioning mechanism 71 and the end cover visual positioning mechanism 51 to accurately position the position of the positive electrode sheet in the positive composite sheet b, the position of the negative electrode sheet in the negative composite sheet a, and the position of the bottom cover c / top cover d, and then stacks the bottom cover c, N+1 negative composite sheets a, N positive composite sheets b and the top cover d according to the stacking rule, thereby improving the alignment accuracy of the positive electrode sheet and the negative electrode sheet in the battery cell, thereby improving the quality of the composite laminated battery cell, making the composite laminated battery cell safe to use and having a long service life, and having high stacking efficiency, thereby improving the efficiency of producing composite laminated battery cells.

[0050] N is a positive integer, and the number of N depends on actual production requirements.

[0051] Specifically, the positive electrode transfer mechanism 4 and the negative electrode transfer mechanism 41 are both manipulators.

[0052] In this embodiment, the positive electrode semi-composite device 1 or / and the negative electrode semi-composite device 2 includes a semi-composite frame 11, a pre-pressing roller 12 rotatably arranged on the semi-composite frame 11, a semi-composite hot pressing mechanism 13 arranged at the discharge end of the pre-pressing roller 12, a vacuum traction mechanism 14 arranged at the discharge end of the semi-composite hot pressing mechanism 13 and used for pulling the diaphragm to move, a cutting mechanism 15 arranged at the discharge end of the vacuum traction mechanism 14 and used for cutting the diaphragm, and a semi-composite conveying device 16 arranged at the discharge end of the cutting mechanism 15. Preferably, the vacuum traction mechanism 14 adopts a vacuum conveyor belt. Preferably, the structure of the positive electrode semi-composite device 1 is the same as that of the negative electrode semi-composite device 2. Therefore, in this embodiment, the production of positive composite sheet b by the positive electrode semi-composite device 1 is taken as an example for explanation.

[0053] In actual work, the vacuum traction mechanism 14 pulls the diaphragm to move along the processing sequence of the positive composite sheet b, and the positive electrode sheet is placed on the diaphragm. Then the pre-pressing roller 12 pre-presses the positive electrode sheet on the diaphragm, so that the positive electrode sheet and the diaphragm are attached. The positive electrode sheet moves with the diaphragm, which improves the stability of the positive electrode sheet on the diaphragm and avoids the position shift of the positive electrode sheet during transportation. When the positive electrode sheet and the diaphragm move to the semi-composite hot pressing mechanism, the semi-composite hot pressing mechanism hot presses the positive electrode sheet and the diaphragm, so that the positive electrode sheet and the diaphragm are firmly connected. Then the cutting mechanism 15 cuts the hot pressed diaphragm into a single positive composite sheet b, and each positive composite sheet b is conveyed to a set position via the semi-composite conveying device 16, and the positive composite sheet b is transferred to the positive conveying device 3 via the positive transfer mechanism 4. The positive semi-composite device 1 and the negative semi-composite device 2 work synchronously and form the positive composite sheet b and the negative composite sheet a respectively, which improves the efficiency of producing the positive composite sheet b and the negative composite sheet a, thereby improving the efficiency of lamination.

[0054] In this embodiment, a pre-stock mechanism 17 is arranged between the vacuum traction mechanism 14 and the cutting mechanism 15, and the pre-stock mechanism 17 includes a pre-stock roller 171 which is lifted and lowered on the semi-composite frame 11 and a lifting driver 172 which is installed on the semi-composite frame 11 and is used to drive the pre-stock roller 171 to lift and lower. A plurality of guide rollers are arranged on both sides of the pre-stock roller 171, and the guide rollers are rotatably arranged on the semi-composite frame 11. The diaphragm is wound around the bottom of the pre-stock roller 171 via the guide roller on one side of the pre-stock roller 171, and then output via the guide roller on the other side of the pre-stock roller 171; specifically, the lifting driver 172 is a transmission structure in which a cylinder or a motor drives a screw rod and a nut.

[0055] When the cutting mechanism 15 cuts the hot-pressed diaphragm, it is necessary to stop conveying the diaphragm for a short time (i.e., intermittently convey the hot-pressed diaphragm with the positive electrode sheet to the cutting mechanism 15), but the pre-pressing process and the hot-pressing process of the positive electrode sheet and the diaphragm are continuously performed. In order to match the processing speed difference between the front end and the rear end of the positive electrode semi-composite device 1, improve production efficiency, and protect the vacuum traction mechanism 14, and avoid the vacuum traction mechanism 14 from being frequently switched between start and stop and being damaged or reducing the service life, the vacuum traction mechanism 14 is required to continuously pull the diaphragm, and a pre-storage mechanism 17 is provided between the vacuum traction mechanism 14 and the cutting mechanism 15 to pre-store the diaphragm after hot-pressing the positive electrode sheet (the pre-storage refers to the part of the hot-pressed diaphragm with the positive composite sheet b that is supplied to the cutting mechanism 15 by the vacuum traction mechanism 14 but the cutting mechanism 15 has no time to cut), so as to ensure that the front end and the rear end of the positive electrode semi-composite device 1 can work normally without stopping the machine. When the pre-deposit mechanism 17 is required to pre-deposit the diaphragm with the positive electrode sheet hot-pressed, the lifting driver 172 drives the pre-deposit roller 171 to move downward, and the moved pre-deposit roller 171 drives the diaphragm downward to pre-deposit the diaphragm; when the diaphragm needs to be released, the lifting driver 172 drives the pre-deposit roller 171 to move upward, and the moved pre-deposit roller 171 releases the part of the diaphragm that has been pre-deposited, so that this part of the diaphragm is fed to the cutting mechanism 15.

[0056] In this embodiment, the semi-composite hot pressing mechanism 13 includes two heat-conducting conveyor belts 131 arranged opposite to each other, and each heat-conducting conveyor belt 131 is provided with a plurality of hot pressing rollers 132 arranged in a straight line; in actual operation, the heat carried by the hot pressing rollers 132 is transferred to the heat-conducting conveyor belt 131, and the positive electrode sheet and the diaphragm pass through the two heat-conducting conveyor belts 131, and the two heat-conducting conveyor belts 131 cooperate to hot-press the positive electrode sheet on the diaphragm and transport it. Among them, the vacuum traction mechanism 14 is used to pull the diaphragm with the hot-pressed positive electrode sheet because the lower surface of the diaphragm is also sticky, and the lower surface of the diaphragm is easy to adhere to the heat-conducting conveyor belt 131 and follow the heat-conducting conveyor belt 131 to move in a cycle. By sucking the diaphragm with the hot-pressed positive electrode sheet by the vacuum traction mechanism 14 and pulling it to move, the above situation can be effectively avoided, ensuring that the diaphragm can move normally.

[0057] Preferably, the heat-conducting conveyor belt 131 is made of stainless steel, which has good heat transfer effect and improves the efficiency and quality of hot pressing the positive electrode sheet onto the diaphragm.

[0058] In this embodiment, the stacking table 6 includes a positioning table 62 and a rotation device 63 for driving the positioning table 62 to rotate and move, and the positive electrode visual positioning mechanism 7, the negative electrode visual positioning mechanism 71 and the end cover visual positioning mechanism 51 are all electrically connected to the rotation device 63. Specifically, the rotation device 63 includes a rotary driver, a first transverse driving mechanism and a first longitudinal driving mechanism, the positioning table 62 is installed at the output end of the rotary driver, the rotary driver is installed at the output end of the first transverse driving mechanism, the first transverse driving mechanism is installed at the output end of the first longitudinal driving mechanism, the rotary driver can be a rotary cylinder, and the first transverse driving mechanism and the first longitudinal driving mechanism can both be a transmission structure of a motor-driven screw rod and a nut. The present invention adopts the free movement (movement and rotation in the horizontal plane) of the stacking table 6 to adjust the relative position of the negative composite sheet a with respect to the bottom cover c, the relative position of the positive composite sheet b with respect to the negative composite sheet a, the relative position of the negative composite sheet a with respect to the positive composite sheet b, and the relative position of the top cover d with respect to the negative composite sheet a, so as to ensure the accuracy of stacking, so that the stacking robot 61 does not need to frequently adjust the position of picking up the positive composite sheet b, the negative composite sheet a, the bottom cover c and the top cover d, and the position of picking up the material is the same each time. Since the simpler the movement of the robot, the higher its working efficiency and the better the working accuracy, the structural design can improve the movement accuracy of the stacking robot 61, and improve the efficiency and quality of stacking.

[0059] In this embodiment, the trimming device 9 includes a trimming table 91, a mobile driving mechanism 92 for driving the trimming table 91 to move, a laser cutting machine 93 located above the trimming table 91, a trimming visual positioning mechanism 94 located above the trimming table 91, a suction device 95 installed on the trimming table 91 and used to absorb waste materials, and a third material transfer robot for transferring the battery cells carried by the hot pressing machine 8 to the trimming table 91, and the trimming visual positioning mechanism 94 is electrically connected to the mobile driving mechanism 92; specifically, the mobile driving mechanism 92 includes a second transverse driving mechanism and a second longitudinal driving mechanism, and the second transverse driving mechanism and the second longitudinal driving mechanism can both adopt a transmission structure of a motor-driven screw and a nut. In order to reduce the burden of the stacking robot 61 and improve production efficiency, the third material transfer robot is also used to transfer the initially formed battery cells after stacking is completed to the hot pressing machine 8.

[0060] The stacking robot 61 picks up the hot-pressed battery cells and places them on the trimming table 91 of the trimming device 9. Then the trimming visual positioning mechanism 94 visually positions the battery cells carried by the trimming table 91. The trimming visual positioning mechanism 94 feeds back the result of the visual positioning to the mobile drive mechanism 92, so that the mobile drive mechanism 92 drives the trimming table 91 to move along the trimming trajectory of the battery cells. The laser cutter 93 performs laser cutting and trimming on the battery cells carried by the trimming table 91 to cut off the excess diaphragms around the battery cells, thereby forming a composite stacked battery cell. While laser cutting and trimming, the suction device 95 absorbs the cut diaphragm waste, which can collect the diaphragm waste in time and avoid the diaphragm waste from being scattered at will, thereby ensuring that the trimming work can be carried out normally, improving the efficiency and quality of the trimming, and keeping the working environment clean.

[0061] In this embodiment, the composite lamination production line also includes a first material transfer robot 81 and a circuit testing device 82 for performing circuit testing on the trimmed battery cells. The first material transfer robot 81 is used to transfer the trimmed battery cells to the circuit testing device 82 or output the battery cells tested by the circuit testing device 82. The composite lamination production line also includes a first product storage 83, a weighing device 84 and a second material transfer robot 85. The first material transfer robot 81 is used to transfer the defective battery cells detected by the circuit testing device 82 to the first product storage 83, and the second material transfer robot 85 is used to transfer the defective battery cells detected by the circuit testing device 82 to the first product storage 83. The good battery cells detected by the testing device 82 are transferred to the weighing device 84, and the first material transfer robot 81 and the second material transfer robot 85 are both electrically connected to the circuit testing device 82; the composite lamination production line also includes a second product storage device 86, a coding device 87 and a packaging machine 88, and the second material transfer robot 85 transfers the defective battery cells weighed by the weighing device 84 to the second product storage device 86, transfers the good battery cells weighed by the weighing device 84 to the coding device 87, or transfers the battery cells coded by the coding device 87 to the packaging machine 88, and the second material transfer robot 85 is electrically connected to the weighing device 84.

[0062] In actual operation, the first material transfer robot 81 transfers the trimmed battery cell carried by the trimming table 91 to the circuit testing device 82, and the circuit testing device 82 performs circuit testing (such as short circuit testing, voltage testing, current testing, etc.) on the battery cell. When the circuit testing device 82 detects that the battery cell is defective, the first material transfer robot 81 transfers the defective battery cell to the first product storage 83, and the defective battery cell is recycled through the first product storage 83; when the circuit testing device 82 detects that the battery cell is good, the second material transfer robot 85 transfers the good battery cell to the weighing device 84, and the weighing device 84 weighs the battery cell. When the weight of the battery cell is When the weight of the battery cell is equal to the set weight value, it proves that the number of stacked sheets of the battery cell is correct and the battery cell is qualified. The second material transfer robot 85 transfers the qualified battery cell to the coding device 87, and the coding device 87 codes the qualified battery cell (such as: barcode or QR code, etc.). Finally, the second material transfer robot 85 transfers the coded battery cell to the packaging machine 88, and the packaging machine 88 packages the battery; when the weight of the battery cell is greater than or less than the set weight value, it proves that the number of stacked sheets of the battery cell is wrong and the battery cell is unqualified. The second material transfer robot 85 transfers the unqualified battery cell to the second product storage 86, and the unqualified battery cell is recycled by the second product storage 86. This structural design, on the one hand, ensures the quality of the composite laminated battery, and on the other hand, realizes the integration of circuit detection, defective elimination, weighing measurement, defective elimination, coding and packaging of the composite laminated battery cell, thereby improving the production efficiency of the composite laminated battery cell.

[0063] In this embodiment, the number of the stacking tables 6 and the number of the stacking manipulators 61 are both at least two, preferably, the number of the stacking tables 6 and the number of the stacking manipulators 61 are both two to four, and the number of the heat pressing machines 8 is multiple, and the number of the heat pressing machines 8 is three. This structural design rationally utilizes the different processing times required for different stations for reasonable layout, further improving the efficiency of producing composite laminated battery cells.

[0064] Preferably, a gluing device 80 is provided between the weighing device 84 and the coding device 87. By adding U-shaped glue around the composite laminated battery cell, the structural stability of the composite laminated battery cell is ensured, the hardness and quality of the composite laminated battery cell are improved, and the service life of the composite laminated battery cell is extended.

[0065] Specifically, the positive electrode visual positioning mechanism 7, the negative electrode visual positioning mechanism 71, the end cap visual positioning mechanism 51 and the trimming visual positioning mechanism 94 all adopt CCD visual mechanisms, and the positive electrode conveying device 3 and the negative electrode conveying device 31 can both adopt vacuum conveyor belts.

[0066] A composite lamination method that can be used in the composite lamination production line of embodiment 1 comprises the following steps:

[0067] Step 1: pre-press the positive electrode sheet onto the diaphragm by means of a pre-pressing roller 12, so that the positive electrode sheet is attached to the diaphragm, and the semi-composite hot pressing mechanism 13 is used to hot press the positive electrode sheet onto the diaphragm by means of hot pressing, and the diaphragm hot-pressed with the positive electrode sheet is cut into a single dense positive composite sheet b by means of a cutting mechanism 15; pre-press the negative electrode sheet onto the diaphragm by means of a pre-pressing roller 12, so that the negative electrode sheet is attached to the diaphragm, and the semi-composite hot pressing mechanism 13 is used to hot press the negative electrode sheet onto the diaphragm by means of hot pressing, and the diaphragm hot-pressed with the negative electrode sheet is cut into a single dense negative composite sheet a by means of a cutting mechanism 15;

[0068] Step 2: Use the end cap visual positioning mechanism 51, the negative electrode visual positioning mechanism 71, the positive electrode visual positioning mechanism 7 and the end cap visual positioning mechanism 51 to respectively visually position the position of the bottom cap c, the position of the negative electrode sheet on the diaphragm in the negative composite sheet a, the position of the positive electrode sheet on the diaphragm in the positive composite sheet b and the position of the top cap d by means of CCD visual positioning;

[0069] Step 3: The stacking table 6 adjusts the position of the bottom cover c according to the result of the CCD visual positioning (end cover visual positioning mechanism 51), and the stacking robot 61 picks up the bottom cover c to the accurate position of the stacking table 6;

[0070] Step 4: The stacking table 6 adjusts the position of the negative electrode sheet in the negative composite sheet a according to the CCD visual positioning (negative electrode visual positioning mechanism 71), and the stacking robot 61 picks up the negative composite sheet a to the accurate position of the bottom cover c carried by the stacking table 6;

[0071] Step 5: The stacking table 6 adjusts the position of the positive electrode sheet in the positive composite sheet b according to the CCD visual positioning (positive electrode visual positioning mechanism 7), and the stacking robot 61 picks up the positive composite sheet b to the accurate position of the negative composite sheet a carried by the stacking table 6, so that the positive electrode sheet in the positive composite sheet b is aligned with the negative electrode sheet in the negative composite sheet a;

[0072] Step 6, repeating steps 4 and 5 to stack in a loop, alternately stacking N+1 negative composite sheets a and N positive composite sheets b, so that the last negative composite sheet a is at the top;

[0073] Step 7: The stacking table 6 adjusts the position of the top cover d according to the result of the CCD visual positioning (end cover visual positioning mechanism 51), and the stacking robot 61 picks up the top cover d to the accurate position of the last negative composite sheet a carried by the stacking table 6 to form a preliminarily formed battery cell;

[0074] Step 8: The preliminarily formed battery cell is subjected to heat pressing and shaping by a heat pressing machine 8 to form a dense battery cell;

[0075] Step nine, the hot pressed and formed battery cell is placed on the trimming table 91 by the third material transfer robot, and the hot pressed and formed battery cell is photographed by CCD visual positioning (trimming visual positioning mechanism 94), and the trimming table 91 adjusts the position of the photographed battery cell according to the CCD visual positioning (trimming visual positioning mechanism 94), and at the same time, the laser cutting machine 93 cuts the excess diaphragm waste around the battery cell to form a composite laminated battery cell, and the cut diaphragm waste is sucked by the suction device 95;

[0076] Step 10: Perform circuit testing on the composite laminated battery cells through the circuit testing device 82 to exclude composite laminated battery cells that fail the circuit testing; when the circuit testing device 82 detects that the battery cell is defective, the first material transfer robot 81 transfers the defective battery cell to the first product storage 83, and the defective battery cell is recycled through the first product storage 83; when the circuit testing device 82 detects that the battery cell is good, the second material transfer robot 85 transfers the good battery cell to the weighing device 84;

[0077] Step 11, weigh and measure the composite laminated battery cells that have passed the circuit test by the weighing device 84 to exclude the composite laminated battery cells with incorrect laminated numbers; when the weight of the battery cell is equal to the set weight value, it proves that the laminated number of the battery cell is correct and the battery cell is qualified, and the second material transfer robot 85 transfers the qualified battery cell to the coding device 87; when the weight of the battery cell is greater than or less than the set weight value, it proves that the laminated number of the battery cell is wrong and the battery cell is unqualified, and the second material transfer robot 85 transfers the unqualified battery cell to the second product storage 86, and the unqualified battery cell is recycled by the second product storage 86;

[0078] Step twelve, the coding device 87 codes the qualified composite laminated battery cells that have passed the weight measurement, and the coding device 87 codes the qualified battery cells (such as barcodes or QR codes, etc.). Finally, the second material transfer robot 85 transfers the coded battery cells to the packaging machine 88, and the packaging machine 88 packages and packages the battery to form the final battery cells.

[0079] Preferably, before coding the composite laminated battery core, a U-shaped glue is applied around the composite laminated battery core by a glue sticking device 80 to improve the quality of the composite laminated battery core.

[0080] Embodiment 2.

[0081] like Figure 2 , Figure 4 and Figure 5 As shown, the difference between this embodiment and the first embodiment is that:

[0082] A composite lamination production line, comprising a positive electrode semi-composite device 1 for compounding a positive electrode sheet with a diaphragm, a negative electrode semi-composite device 2 for compounding a negative electrode sheet with a diaphragm, a positive electrode conveying device 3 arranged at the discharge end of the positive electrode semi-composite device 1, a negative electrode conveying device 31 arranged at the discharge end of the negative electrode semi-composite device 2, a positive electrode transfer mechanism 4 for transferring a positive composite sheet b formed by the positive electrode semi-composite device 1 to the positive electrode conveying device 3, a negative electrode transfer mechanism 41 for transferring a negative composite sheet a formed by the negative electrode semi-composite device 2 to the negative electrode conveying device 31, a lamination table 6 movably arranged between the negative electrode conveying device 31 and the positive electrode conveying device 3, a positive electrode visual positioning mechanism 7 arranged at the positive electrode conveying device 3 and used for visually positioning the positive composite sheet b conveyed by the positive electrode conveying device 3, and a positive electrode visual positioning mechanism 7 arranged at the negative electrode conveying device 3. The cathode conveying device 31 includes a negative electrode visual positioning mechanism 71 for visually positioning the negative composite sheet a conveyed by the negative electrode conveying device 31, a stacking robot 61 for transferring the negative composite sheet a and the positive composite sheet b to the stacking table 6 for stacking to form an initial battery cell, a coating device for coating the initial battery cell to form a battery cell, a hot pressing machine 8 for hot pressing the battery cell, and a trimming device 9 for trimming the battery cell after hot pressing. The positive electrode visual positioning mechanism 7 and the negative electrode visual positioning mechanism 71 are both electrically connected to the stacking table 6; specifically, the coating device is a coating machine 96, which is located between the stacking table 6 and the hot pressing machine 8. Preferably, the coating machine 96 uses a diaphragm to coat the initial battery cell. The coating machine 96 can use a coating machine in existing technology, which will not be repeated here.

[0083] In actual work, the positive electrode semi-composite device 1 presses the positive electrode sheet onto the diaphragm and forms a dense positive composite sheet b, the negative electrode semi-composite device 2 presses the negative electrode sheet onto the diaphragm and forms a dense negative composite sheet a, the positive electrode transfer mechanism 4 transfers the positive composite sheet b to the positive electrode conveying device 3, the negative electrode transfer mechanism 41 transfers the negative composite sheet a to the negative electrode conveying device 31, the positive electrode visual positioning mechanism 7 visually locates the position of the positive electrode sheet on the positive composite sheet b conveyed by the positive electrode conveying device 3, the negative electrode visual positioning mechanism 71 visually locates the position of the negative electrode sheet on the negative composite sheet a conveyed by the negative electrode conveying device 31, the negative electrode visual positioning mechanism 71 and the positive electrode visual positioning mechanism 7 feed back the results of visual positioning to the stacking table 6 in sequence, and the stacking robot 61 picks up the negative composite sheet a conveyed by the negative electrode conveying device 31 After being taken to the exact position of the stacking table 6, the stacking robot 61 picks up the positive composite sheet b conveyed by the positive electrode conveying device 3 and puts it on the positive composite sheet b on the stacking table 6. According to the cyclic alternating stacking method of the negative composite sheet a and the positive composite sheet b, after the stacking robot 61 alternately stacks N+1 negative composite sheets a and N positive composite sheets b, the negative composite sheet a is at the topmost surface to form an initial battery cell. The coating machine 96 coats the initial battery cell to form a battery cell. The stacking robot 61 transfers the battery cell on the stacking table 6 to the hot pressing machine 8. The hot pressing machine 8 presses the battery cell into shape to form a dense battery cell. The stacking robot 61 transfers the pressed and formed battery cell to the trimming device 9. The trimming device 9 trims the pressed and formed battery cell. The trimming refers to trimming the excess diaphragm edge in the pressed and formed battery cell to form a composite stacked battery cell.

[0084] Specifically, the stacking table 6 includes a positioning table 62 and a rotation device 63 for driving the positioning table 62 to rotate and move, and the positive pole visual positioning mechanism 7 and the negative pole visual positioning mechanism 71 are electrically connected to the rotation device 63 .

[0085] A composite lamination method that can be used in the composite lamination production line of embodiment 2 comprises the following steps:

[0086] Step 1: pre-press the positive electrode sheet onto the diaphragm by means of a pre-pressing roller 12, so that the positive electrode sheet is attached to the diaphragm, and the semi-composite hot pressing mechanism 13 is used to hot press the positive electrode sheet onto the diaphragm by means of hot pressing, and the diaphragm hot-pressed with the positive electrode sheet is cut into a single dense positive composite sheet b by means of a cutting mechanism 15; pre-press the negative electrode sheet onto the diaphragm by means of a pre-pressing roller 12, so that the negative electrode sheet is attached to the diaphragm, and the semi-composite hot pressing mechanism 13 is used to hot press the negative electrode sheet onto the diaphragm by means of hot pressing, and the diaphragm hot-pressed with the negative electrode sheet is cut into a single dense negative composite sheet a by means of a cutting mechanism 15;

[0087] Step 2: Use the negative electrode visual positioning mechanism 71 and the positive electrode visual positioning mechanism 7 to visually position the position of the negative electrode sheet on the diaphragm in the negative composite sheet a and the position of the positive electrode sheet on the diaphragm in the positive composite sheet b respectively by means of CCD visual positioning;

[0088] Step 3: The stacking table 6 adjusts the position of the negative electrode sheet in the negative composite sheet a according to the CCD visual positioning (negative electrode visual positioning mechanism 71), and the stacking robot 61 picks up the negative composite sheet a to the accurate position of the stacking table 6;

[0089] Step 4: The stacking table 6 adjusts the position of the positive electrode sheet in the positive composite sheet b according to the result of the CCD visual positioning (positive electrode visual positioning mechanism 7), and the stacking robot 61 picks up the positive composite sheet b to the accurate position of the negative composite sheet a carried by the stacking table 6, so that the positive electrode sheet in the positive composite sheet b is aligned with the negative electrode sheet in the negative composite sheet a;

[0090] Step 5, repeating steps 3 and 4 to stack in a loop, alternately stacking N+1 negative composite sheets a and N positive composite sheets b, so that the last negative composite sheet a is on the top surface, to form an initial battery cell;

[0091] Step 6: The stacking robot 61 places the primary battery cell on the coating machine 96, and the coating machine 96 is used to coat the primary battery cell with a diaphragm to form a preliminarily formed battery cell;

[0092] Step 7: The preliminarily formed battery cell is subjected to heat pressing and shaping by a heat pressing machine 8 to form a dense battery cell;

[0093] Step 8: The hot pressed and formed battery cell is placed on the trimming table 91 by the third material transfer manipulator, and the hot pressed and formed battery cell is photographed by CCD visual positioning (trimming visual positioning mechanism 94). The trimming table 91 adjusts the position of the photographed battery cell according to the CCD visual positioning (trimming visual positioning mechanism 94). At the same time, the laser cutting machine 93 cuts the excess diaphragm waste around the battery cell to form a composite laminated battery cell, and the cut diaphragm waste is sucked by the suction device 95;

[0094] Step nine, the circuit test device 82 performs a circuit test on the composite laminated battery cells to exclude the composite laminated battery cells that fail the circuit test; when the circuit test device 82 detects that the battery cell is defective, the first material transfer robot 81 transfers the defective battery cell to the first product storage 83, and the defective battery cell is recycled through the first product storage 83; when the circuit test device 82 detects that the battery cell is good, the second material transfer robot 85 transfers the good battery cell to the weighing device 84;

[0095] Step 10, weigh and measure the composite laminated battery cells that have passed the circuit test by the weighing device 84 to exclude composite laminated battery cells with incorrect laminate numbers; when the weight of the battery cell is equal to the set weight value, it proves that the laminate number of the battery cell is correct and the battery cell is qualified, and the second material transfer robot 85 transfers the qualified battery cell to the coding device 87; when the weight of the battery cell is greater than or less than the set weight value, it proves that the laminate number of the battery cell is wrong and the battery cell is unqualified, and the second material transfer robot 85 transfers the unqualified battery cell to the second product storage 86, and the unqualified battery cell is recycled by the second product storage 86;

[0096] Step 11, the coding device 87 codes the qualified composite laminated battery cells that have passed the weight measurement, and the coding device 87 codes the qualified battery cells (such as barcodes or QR codes, etc.). Finally, the second material transfer robot 85 transfers the coded battery cells to the packaging machine 88, and the packaging machine 88 packages and packages the battery to form the final battery cells.

[0097] Preferably, before coding the composite laminated battery core, a U-shaped glue is applied around the composite laminated battery core by a glue sticking device 80 to improve the quality of the composite laminated battery core.

[0098] All technical features in this embodiment can be freely combined according to actual needs.

[0099] The above embodiments are preferred implementation schemes of the present invention. In addition, the present invention may also be implemented in other ways. Any obvious replacement without departing from the concept of the present technical solution is within the protection scope of the present invention.

Claims

1. A composite lamination production line, characterized in that: The invention comprises a positive electrode semi-composite device for compounding a positive electrode sheet with a diaphragm, a negative electrode semi-composite device for compounding a negative electrode sheet with a diaphragm, a positive electrode conveying device arranged at the discharge end of the positive electrode semi-composite device, a negative electrode conveying device arranged at the discharge end of the negative electrode semi-composite device, a positive electrode transfer mechanism for transferring a positive composite sheet b formed by the positive electrode semi-composite device to the positive electrode conveying device, a negative electrode transfer mechanism for transferring a negative composite sheet a formed by the negative electrode semi-composite device to the negative electrode conveying device, a stacking table movably arranged between the negative electrode conveying device and the positive electrode conveying device, and a positive electrode conveying device arranged at the positive electrode conveying device and used for A positive electrode visual positioning mechanism for visually positioning the positive composite sheet b conveyed by the positive electrode conveying device, a negative electrode visual positioning mechanism arranged on the negative electrode conveying device and used for visually positioning the negative composite sheet a conveyed by the negative electrode conveying device, a stacking robot for transferring the negative composite sheet a and the positive composite sheet b to a stacking table for stacking to form an initial battery cell, a coating device for coating the initial battery cell to form a battery cell, a heat pressing machine for heat pressing the battery cell and a trimming device for trimming the battery cell after heat pressing, the positive electrode visual positioning mechanism and the negative electrode visual positioning mechanism are both electrically connected to the stacking table.

2. A composite lamination production line according to claim 1, characterized in that: The coating device includes a cover storage device for storing the bottom cover c and the top cover d and an end cover visual positioning mechanism arranged in the cover storage device and used for visually positioning the bottom cover c and / or the top cover d. The stacking robot transfers the bottom cover c, the negative composite sheet a, the positive composite sheet b and the top cover d to the stacking table for stacking in the stacking order to form a battery cell. The end cover visual positioning mechanism is electrically connected to the stacking table.

3. A composite lamination production line according to claim 1, characterized in that: The coating device is a coating machine, and the coating machine is located between the lamination table and the hot pressing machine.

4. A composite lamination production line according to claim 1, characterized in that: The positive electrode semi-composite device and / or the negative electrode semi-composite device include a semi-composite frame, a pre-pressing roller rotatably arranged on the semi-composite frame, a semi-composite hot pressing mechanism arranged at the discharge end of the pre-pressing roller, a vacuum traction mechanism arranged at the discharge end of the semi-composite hot pressing mechanism and used for pulling the diaphragm to move, a cutting mechanism arranged at the discharge end of the vacuum traction mechanism and used for cutting the diaphragm, and a semi-composite conveying device arranged at the discharge end of the cutting mechanism.

5. A composite lamination production line according to claim 4, characterized in that: A pre-storage mechanism is arranged between the vacuum traction mechanism and the cutting mechanism.

6. A composite lamination production line according to claim 1, characterized in that: The trimming device includes a trimming table, a mobile driving mechanism for driving the trimming table to move, a laser cutting machine located above the trimming table, a trimming visual positioning mechanism located above the trimming table, and a suction device installed on the trimming table and used to absorb waste materials. The trimming visual positioning mechanism is electrically connected to the mobile driving mechanism.

7. The composite lamination production line according to claim 1, characterized in that: The composite lamination production line also includes a first material transfer robot and a circuit testing device for performing circuit testing on the trimmed battery cells. The first material transfer robot is used to transfer the trimmed battery cells to the circuit testing device or output the battery cells tested by the circuit testing device.

8. A composite lamination production line according to claim 7, characterized in that: The composite lamination production line also includes a first product storage, a weighing machine, a second material transfer robot, a second product storage, a coding device and a packaging machine. The first material transfer robot is used to transfer the defective battery cells detected by the circuit testing device to the first product storage, and the second material transfer robot is used to transfer the good battery cells detected by the circuit testing device to the weighing machine. The first material transfer robot and the second material transfer robot are both electrically connected to the circuit testing device. The second material transfer robot transfers the defective battery cells weighed by the weighing machine to the second product storage, transfers the good battery cells weighed by the weighing machine to the coding device, or transfers the battery cells coded by the coding device to the packaging machine. The second material transfer robot is electrically connected to the weighing machine.

9. A composite lamination method, characterized in that: The steps include: Step 1: pre-press the positive electrode sheet on the diaphragm so that the positive electrode sheet is attached to the diaphragm, hot-press the positive electrode sheet on the diaphragm by hot pressing, and cut the diaphragm with the positive electrode sheet hot pressed into a single dense positive composite sheet b; pre-press the negative electrode sheet on the diaphragm so that the negative electrode sheet is attached to the diaphragm, hot-press the negative electrode sheet on the diaphragm by hot pressing, and cut the diaphragm with the negative electrode sheet hot pressed into a single dense negative composite sheet a; Step 2: Visually locate the position of the bottom cover c, the position of the negative electrode sheet in the negative composite sheet a on the diaphragm, the position of the positive electrode sheet in the positive composite sheet b on the diaphragm, and the position of the top cover d by means of CCD visual positioning; Step 3: The stacking table adjusts the position according to the result of the CCD visual positioning of the bottom cover c, and the stacking robot picks up the bottom cover c to the accurate position of the stacking table; Step 4: The stacking table adjusts the position of the negative electrode sheet in the negative composite sheet a according to the CCD visual positioning result, and the stacking robot picks up the negative composite sheet a to the accurate position of the bottom cover c carried by the stacking table; Step 5: The stacking table adjusts the position of the positive electrode sheet in the positive composite sheet b according to the CCD visual positioning result, and the stacking robot picks up the positive composite sheet b to the accurate position of the negative composite sheet a carried by the stacking table, so that the positive electrode sheet in the positive composite sheet b is aligned with the negative electrode sheet in the negative composite sheet a; Step 6, repeating steps 4 and 5 to stack in a loop, alternately stacking N+1 negative composite sheets a and N positive composite sheets b, so that the last negative composite sheet a is at the top; Step 7: The stacking table adjusts the position of the top cover d according to the result of the CCD visual positioning, and the stacking robot picks up the top cover d to the exact position of the last negative composite sheet a carried by the stacking table to form a preliminary formed battery cell; Step 8: hot pressing the preliminarily formed battery cell by a hot pressing machine to form a dense battery cell; Step nine, placing the hot pressed and formed battery cell on the trimming table, photographing the hot pressed and formed battery cell by means of CCD visual positioning, and adjusting the position of the trimming table according to the photographed result of the hot pressed and formed battery cell by CCD visual positioning, while the laser cutting machine cuts the excess diaphragm waste around the battery cell to form a composite laminated battery cell, and the cut diaphragm waste is sucked by the suction device; Step 10: Conducting circuit testing on the composite laminated cells to exclude composite laminated cells that fail the circuit testing; Step 11, weigh and measure the composite laminated cells that have passed the circuit test to exclude composite laminated cells with incorrect number of laminates; Step 12: Coding and packaging the qualified composite laminated battery cells after weight measurement to form the final battery cells.

10. A composite lamination method, characterized in that: The steps include: Step 1: pre-press the positive electrode sheet on the diaphragm so that the positive electrode sheet is attached to the diaphragm, hot-press the positive electrode sheet on the diaphragm by hot pressing, and cut the diaphragm with the positive electrode sheet hot pressed into a single dense positive composite sheet b; pre-press the negative electrode sheet on the diaphragm so that the negative electrode sheet is attached to the diaphragm, hot-press the negative electrode sheet on the diaphragm by hot pressing, and cut the diaphragm with the negative electrode sheet hot pressed into a single dense negative composite sheet a; Step 2: Visually locate the position of the negative electrode sheet on the diaphragm in the negative composite sheet a and the position of the positive electrode sheet on the diaphragm in the positive composite sheet b by means of CCD visual positioning; Step 3: The stacking table adjusts the position of the negative electrode sheet in the negative composite sheet a according to the CCD visual positioning result, and the stacking robot picks up the negative composite sheet a to the accurate position of the stacking table; Step 4: The stacking table adjusts the position of the positive electrode sheet in the positive composite sheet b according to the CCD visual positioning result, and the stacking robot picks up the positive composite sheet b to the accurate position of the negative composite sheet a carried by the stacking table, so that the positive electrode sheet in the positive composite sheet b is aligned with the negative electrode sheet in the negative composite sheet a; Step 5, repeating steps 3 and 4 to stack in a loop, alternately stacking N+1 negative composite sheets a and N positive composite sheets b, so that the last negative composite sheet a is on the top surface, to form an initial battery cell; Step 6: The coating machine coats the primary cell with the diaphragm to form a preliminarily formed cell; Step 7: hot pressing the preliminarily formed battery cell by a hot pressing machine to form a dense battery cell; Step 8: Place the hot pressed and formed battery cell on the trimming table, and photograph the hot pressed and formed battery cell by CCD visual positioning. The trimming table adjusts the position of the photographed battery cell according to the CCD visual positioning. At the same time, the laser cutting machine cuts the excess diaphragm waste around the battery cell to form a composite laminated battery cell, and the cut diaphragm waste is sucked by the suction device; Step nine, performing circuit testing on the composite laminated cells to exclude composite laminated cells that fail the circuit test; Step 10, weigh and measure the composite laminated cells that have passed the circuit test to exclude composite laminated cells with incorrect number of laminates; Step 11: Coding and packaging the qualified composite laminated battery cells after weight measurement to form the final battery cells.

Images