A laminated battery cell preparation system and method

Abstract

A laminated battery cell preparation system includes a frame, a diaphragm supply mechanism, a lamination platform, a positive electrode sheet supply mechanism, and a negative electrode sheet supply mechanism. The frame is also provided with a diaphragm reversing device, the diaphragm reversing device being mounted on one side of the lamination platform. The diaphragm reversing device includes a mounting bracket and a flip seat, and the flip seat is provided with a diaphragm pulling mechanism. The flip seat includes a first station and a second station. When the flip seat is located at the second station, the diaphragm pulling mechanism is located on the lamination platform. The present invention utilizes the actions of the diaphragm supply mechanism, the positive electrode sheet supply mechanism, and the negative electrode sheet supply mechanism to achieve automated production of battery cells on the lamination platform. At the same time, the diaphragm reversing device is used to pull and fold / reverse the diaphragm through the diaphragm pulling mechanism on the flip seat, so that the diaphragm can always be stably attached to the lamination platform, thereby improving the production quality and production efficiency of the laminated battery cells.

Description

Technical Field

[0001] The present invention relates to production equipment for lithium batteries, and in particular to a system and method for preparing battery cells. Background Art

[0002] Lithium-ion batteries have long been widely used in mobile phones, laptops, power tools, electric vehicles, streetlight backup power supplies, navigation lights, and small household appliances, arguably representing the largest application group. Furthermore, as new energy and environmental protection are the mainstream trends of the future, lithium batteries have become an emerging industry that the country is strongly promoting. Therefore, the efficient and automated production of lithium batteries, which are both environmentally friendly and technologically advanced, is of great significance.

[0003] At present, most of the production equipment for lithium battery cells adopts the Z-shaped lamination method. As shown in the patent with publication number CN212725406 U, during the lamination process, the cells are prepared in the order of diaphragm-negative electrode sheet-diaphragm-positive electrode sheet-diaphragm-negative electrode sheet-diaphragm... from bottom to top. Without tail winding, the top diaphragm is directly cut to complete the lamination production of a single cell. Then, in preparation for the next cell lamination, the diaphragm needs to be re-attached to the platform. However, since there is no tension control after the diaphragm is cut, and due to process requirements, the diaphragm needs to be folded / reversed when it is re-attached to the platform. In this process, the diaphragm is prone to position displacement and it takes a long time, resulting in low cell production efficiency. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a device and method for preparing a laminated battery core to solve one or more technical problems existing in the prior art and at least provide a beneficial option or create conditions.

[0005] The solution of the present invention to its technical problem is: a laminated battery cell preparation system, including a frame; a diaphragm providing mechanism for providing a diaphragm; a positive electrode sheet providing mechanism for providing prepared positive electrode sheets; a negative electrode sheet providing mechanism for providing prepared negative electrode sheets; a lamination mechanism, the lamination mechanism including a lamination platform, the lamination platform is used for preparing battery cells with diaphragms, positive electrode sheets and negative electrode sheets, the lamination mechanism is equipped with a diaphragm reversal device, the diaphragm reversal device includes a flipping assembly, the flipping assembly is movably connected to the lamination platform, the flipping assembly is provided with a diaphragm traction mechanism; the flipping assembly includes a first station and a second station, when the flipping assembly is located at the first station, the diaphragm traction mechanism is located on one side of the lamination platform, when the flipping assembly is located at the second station, the diaphragm traction mechanism pulls the diaphragm onto the lamination platform.

[0006] The beneficial effects of the present invention are as follows: the present invention realizes the automated production of battery cells on the stacking platform by utilizing the actions of the diaphragm providing mechanism, the positive electrode sheet providing mechanism, and the negative electrode sheet providing mechanism, and at the same time utilizes the diaphragm reversal device to pull and fold / reverse the diaphragm through the diaphragm traction mechanism on the flip seat, so that the diaphragm can always be firmly attached to the stacking platform, thereby improving the production quality and production efficiency of the stacked battery cells.

[0007] As a further improvement of the above technical solution, the diaphragm traction mechanism can be fixed relatively to one end of the diaphragm and drive the diaphragm to move. The diaphragm traction mechanism is a vacuum mechanism, and the vacuum mechanism includes an upper surface and an inner cavity. A plurality of vents are provided on the upper surface, and the vents are connected to the inner cavity. The side of the vacuum box is also provided with an air extraction port, and the air extraction port is connected to the inner cavity. The diaphragm traction mechanism adopts a vacuum structure, which can simplify the overall mechanism and improve efficiency. The diaphragm traction mechanism can also be a clamping mechanism, and the clamping mechanism is provided with a plurality of claws, and the claws are used to clamp the diaphragm and pull the diaphragm under the action of the flip assembly. Through the clamping mechanism, the connection with the diaphragm can be made more reliable during operation.

[0008] As a further improvement to the above technical solution, the diaphragm reversing device is installed on the side of the lamination mechanism close to the negative electrode sheet providing mechanism. The diaphragm reversing device drives the diaphragm to reverse from the negative electrode sheet providing mechanism to the positive electrode sheet providing mechanism. The diaphragm reversing device is installed on the negative electrode sheet side to facilitate faster and more timely pulling after the diaphragm is completed.

[0009] As a further improvement to the above technical solution, the flip assembly is rotationally connected to the lamination platform, the flip assembly includes a mounting bracket, the mounting bracket is provided with a flip drive unit, the flip drive unit includes a housing and an output shaft, the housing is fixed to the mounting bracket, the output shaft is drivingly connected to the flip assembly, the flip assembly includes a connecting plate and a flip plate, the diaphragm traction mechanism is fixed to the connecting plate, there are two flip plates, the two flip plates are respectively located on both sides of the connecting plate, one of the flip plates is connected to the output shaft, and the other flip plate is connected to the mounting bracket via a rotating shaft, the axis of the rotating shaft is located outside the diaphragm traction mechanism. By optimizing the structure of the flip assembly, the diaphragm reversing device can be made simpler and more compact, the operation can be smoother, and the production efficiency can be higher.

[0010] As a further improvement of the above technical solution, a pressing mechanism is further provided on the lamination platform; the pressing mechanism comprises a pressing knife and a driving mechanism, wherein the driving mechanism drives the pressing knife to be movably connected relative to the lamination platform. The pressing knife is used to ensure that each lamination is fixed.

[0011] As a further improvement to the above technical solution, a film cutting mechanism is also provided next to the lamination platform. This mechanism cuts the separator film after the cell is prepared. The mechanism is located between the positive electrode sheet providing mechanism and the negative electrode sheet providing mechanism. The mechanism is located on the side close to the negative electrode sheet, making the overall structure of the device simpler and more compact.

[0012] As a further improvement to the above technical solution, the positive electrode sheet supply mechanism includes a positive electrode sheet cutting unit and a positive electrode sheet deflection correction unit; the negative electrode sheet supply mechanism includes a negative electrode sheet cutting unit and a negative electrode sheet deflection correction unit. Utilizing the electrode sheet cutting unit and the electrode sheet deflection correction unit improves the automation of laminated battery cell production and enhances product quality.

[0013] As a further improvement to the above technical solution, the diaphragm supply mechanism further includes a base plate, an unwinding assembly, a tension detector, and a diaphragm buffer unit. The unwinding assembly is disposed on the base plate. After passing through the unwinding assembly, the diaphragm passes through the tension detector, the diaphragm buffer unit, and a pair of film feed rollers. The tension detector and the diaphragm buffer unit ensure smoother diaphragm unwinding, improving the quality of the battery cell stack.

[0014] As a further improvement to the above technical solution, the stacking mechanism includes a platform support, a lifting assembly, and a table. The lifting assembly is mounted on the platform support, and the table is connected to the platform support via the lifting assembly for vertical sliding movement. The table is continuously raised and lowered during the stacking process, ensuring that the height position remains constant during each stacking operation, thereby improving the quality of the battery cell stacking.

[0015] As a further improvement to the above technical solution, the membrane supply mechanism includes a pair of film-feeding rollers. The lamination mechanism is fixed relative to the frame, and the pair of film-feeding rollers is mounted above the lamination mechanism and slides left and right relative to the lamination mechanism. The movable range of the pair of film-feeding rollers is the same as that of the lamination platform. During lamination, the lamination platform remains stationary while the pair of film-feeding rollers slides left and right relative to the lamination mechanism, thereby improving the efficiency of the lamination mechanism.

[0016] As a further improvement of the above technical solution, the positive electrode sheet providing mechanism includes a first manipulator, the negative electrode sheet providing mechanism includes a second manipulator, the positive electrode sheet providing mechanism is located on the left side of the stacking mechanism, and the negative electrode sheet providing mechanism is located on the right side of the stacking platform, and the first manipulator and the second manipulator are both slidably connected to the frame.

[0017] At the same time, the present invention also provides a method for preparing a laminated battery cell using the above-mentioned laminated battery cell preparation system, comprising the following steps:

[0018] S1. Use a film feeding roller pair to lay the diaphragm flat on the lamination platform. At this time, the film feeding roller pair is located above one side of the lamination platform;

[0019] S2, using the second manipulator to place the negative electrode sheet on the diaphragm;

[0020] S3, the film feeding roller group moves along the first direction so that the separator covers the negative electrode sheet;

[0021] S4, using a first manipulator to place the positive electrode sheet on the above-mentioned diaphragm;

[0022] S5, the film feeding roller group moves along a second direction so that the separator covers the positive electrode sheet; the second direction is opposite to the first direction;

[0023] S6. Place the negative electrode sheet on the separator using a second manipulator;

[0024] S7, the film feeding roller group moves along the first direction so that the separator covers the negative electrode sheet;

[0025] Repeat steps S4 to S7 until the number of battery cell layers reaches the predetermined requirement;

[0026] S8, adsorbing and pulling the diaphragm through the diaphragm reversing device so that the diaphragm can be pressed onto the stacking platform;

[0027] S9, the film feeding roller group drives the diaphragm to move along the second direction, keeps the diaphragm pressed on the lamination platform, and cuts the diaphragm;

[0028] S10, remove the stacked battery cells;

[0029] Repeat steps S2 to S10.

[0030] Using the above method, after each lamination, the diaphragm is first adsorbed and pulled by the diaphragm reversing device, thereby ensuring that the diaphragm can still maintain tension after being cut, improving the efficiency and quality of the diaphragm when it is re-laid on the table, thereby improving the production efficiency and production quality of the laminated battery cell.

[0031] As a further improvement of the above technical solution, after step S10, the battery cell is subjected to a glue-bonding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly describes the drawings required for describing the embodiments. Obviously, the drawings described only illustrate some embodiments of the present invention, not all of them. Those skilled in the art can derive other design solutions and drawings based on these drawings without inventive effort.

[0033] Figure 1It is an overall schematic diagram of the laminated battery core preparation system of the present invention;

[0034] Figure 2 is a perspective schematic diagram of the diaphragm reversal device of the present invention;

[0035] Figure 3 It is a three-dimensional schematic diagram of the lamination platform of the present invention. DETAILED DESCRIPTION

[0036] The following will clearly and completely describe the concept, specific structure and technical effects of the present invention in conjunction with the embodiments and drawings, so as to fully understand the purpose, characteristics and effects of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention. The preferred embodiments of the present invention are shown in the drawings. The purpose of the drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0037] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0038] In the description of the present invention, "several" means one or more, "many" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0039] In the description of the present invention, unless otherwise expressly defined, terms such as "install," "connect," and "set" should be interpreted broadly. Those skilled in the art can reasonably determine the specific meanings of these terms in the present invention based on the specific content of the technical solution. Furthermore, the various technical features of the present invention may be combined interchangeably as long as they do not conflict with each other.

[0040] Reference Figures 1 to 3, the present invention first provides a system that can automatically realize the stacking production of battery cells. When stacking the battery cells, the positive and negative electrode sheets need to be placed alternately on the diaphragm, and at the same time, the diaphragm needs to cover the positive and negative electrode sheets up and down to prevent the negative electrode sheets from directly contacting the positive electrode sheets. To this end, the stacked battery preparation system includes a frame 10. It can be understood that the frame 10 mainly plays the role of supporting, fixing, and installing. The frame 10 is not limited to a single component, but can also be composed of multiple different components. A stacking mechanism is fixed on the frame 10, and the stacking mechanism includes a stacking platform 100. A positive electrode sheet providing mechanism 200 and a negative electrode sheet providing mechanism 300 are respectively provided on the left and right sides of the stacking platform. In addition, a diaphragm providing mechanism 400 is also provided on the frame 10, and the diaphragm providing mechanism 400 is located above the stacking platform 100 as a whole. The positive electrode sheet providing mechanism 200 includes a first manipulator 210, the negative electrode sheet providing mechanism 300 includes a second manipulator 310, and the separator providing mechanism 400 includes a film feeding roller set 410. The first manipulator 210, the second manipulator 310, and the film feeding roller set 410 are all movable left and right relative to the lamination platform 100. Specifically, the frame 10 includes a crossbeam 11, which is located above the lamination platform 100. The crossbeam 11 is provided with a slide rail extending in the left-right direction. The first manipulator 210, the second manipulator 310, and the film feeding roller set 410 are all slidably connected to the slide rail.

[0041] During production, the stacking platform 100 remains relatively stationary, while the first robot 210 moves back and forth left and right to deliver the positive electrode sheet to the stacking platform 100; the second robot 310 also moves back and forth left and right to deliver the negative electrode sheet to the stacking platform 100, and the film-feeding roller group 410 continuously moves left and right relative to the stacking platform 100 while continuously feeding the film, so that the diaphragm is fed in a "Z" shape.

[0042] The laminated cell preparation system also includes a diaphragm reversing device 500, adjacent to which is a film cutting mechanism. The diaphragm reversing device 500 is mounted on the right side of the lamination platform, near the negative electrode sheet providing mechanism 300. The diaphragm reversing device 500 includes a flipping assembly, comprising a flipping seat 520 and a mounting bracket 510. The flipping seat 520 is pivotally connected to the mounting bracket 510. A diaphragm pulling mechanism 600 is also mounted on the flipping seat 520, secured to the flipping seat 520 so that the diaphragm pulling mechanism 600 can also be flipped relative to the mounting bracket 510. A flipping motor 530 is also mounted on the mounting bracket 510. This flipping motor 530 is operatively connected to the flipping seat 520, driving the flipping seat 520 to flip about its axis relative to the lamination platform 100. Once fully flipped, the diaphragm remains held in place, and the film cutting mechanism then activates, severing the diaphragm. The film cutting mechanism can adopt a common cutting structure in the prior art, so it will not be described in detail here. In some other examples, in addition to using a flip motor as a flip driving unit, the flip seat can also be driven to rotate by, for example, a flip cylinder.

[0043] For details, see Figure 2 The flip seat 520 includes a connecting plate 521 and a flip plate 522. The flip plates 522 are two in number, fixed to the front and rear ends of the connecting plate 521. The flip plates 522 are rectangular, i.e., they include transverse and longitudinal edges, the transverse and longitudinal edges being perpendicular to each other. The connecting plates 521 extend in the same direction as the longitudinal edges, i.e., the longitudinal edges extend in the front-to-back direction, and the connecting plates 521 are fixedly connected to the longitudinal edges. The rotating shaft is mounted on the transverse edge, such that the axis of the rotating shaft is offset from the longitudinal edge in the left-right direction. Since the diaphragm traction mechanism 600 is mounted on the connecting plate 521, which is in turn fixed to the longitudinal edge, the axis of the rotating shaft is also offset from the diaphragm traction mechanism 600 in the left-right direction, such that the axis of the rotating shaft is located outside the diaphragm traction mechanism 600. Driven by the flip motor 530 , the diaphragm traction mechanism 600 can flip relative to the lamination platform 100 around the rotation axis.

[0044] The length of the connecting plate 521 is slightly greater than that of the lamination platform. The two flip plates 522 are respectively located on the front and rear sides of the lamination platform 100. This allows the connecting plate 521 to be closer to the lamination platform 100, thereby making the entire diaphragm reversal device more compact.

[0045] In this embodiment, the flip motor 530 can drive the flip seat 520 to achieve a 180° flip. The flip seat 520 is configured with two working positions, with the phase angles of the two positions differing by 180°. When the flip seat 520 is in the first working position, the diaphragm pulling mechanism 600 is located outside the lamination platform 100, thereby preventing it from interfering with the lamination process of the diaphragms and pole pieces. When the flip seat 520 is in the second working position, the diaphragm pulling mechanism 600 is located within the lamination platform 100.

[0046] During operation, the flip seat 520 is at the first station most of the time. When the production of a stacked battery cell is completed, the diaphragm traction mechanism 600 starts to work. The diaphragm is now located above the diaphragm traction mechanism, and then the diaphragm traction mechanism 600 adsorbs the diaphragm; then the flip motor 530 is activated to drive the flip seat 520 to flip from the first station to the second station. During the flipping process of the flip seat 520, the diaphragm traction mechanism 600 always maintains an adsorption relationship with the diaphragm, thereby driving the diaphragm to flip relatively; until the flip seat 520 reaches the second station, the diaphragm traction mechanism 600 drives the diaphragm to flip 180°. The diaphragm was originally located on the upper side of the diaphragm traction mechanism 600. After flipping 180°, the diaphragm traction mechanism 600 presses the diaphragm onto the stacking platform 100. At this point, the diaphragm can be cut. After being cut, the diaphragm is always pressed on the stacking platform by the diaphragm traction mechanism 600, so the free end of the diaphragm is always under tension. At this time, the diaphragm moves in the opposite direction, and the quality and efficiency of re-laying the diaphragm are greatly improved.

[0047] In this embodiment, the flip assembly and the stacking platform are connected by relative rotation. In other embodiments, the flip assembly and the stacking platform may be connected by translation or other movable methods. For example, the flip assembly includes a linear drive unit that drives the flip seat to change position, such that when the flip seat is in the first position, the diaphragm pulling mechanism is located on one side of the stacking platform, and when the flip seat is in the second position, the diaphragm pulling mechanism pulls the diaphragm onto the stacking platform.

[0048] Next, combined with the entire laminated battery preparation system, the preparation method of laminated batteries is introduced in detail:

[0049] First, the positive electrode sheet providing mechanism 200 and the negative electrode sheet providing mechanism 300 automatically prepare the positive electrode sheet and the negative electrode sheet respectively, while the diaphragm providing mechanism 400 completes the preparation of the diaphragm;

[0050] After the positive electrode, negative electrode and separator are ready, you can start stacking:

[0051] S1. Use the film feeding roller group to lay the diaphragm flat on the lamination platform. At this time, the film feeding roller group is located on the upper left of the lamination platform;

[0052] S2, using the second manipulator to place the negative electrode sheet on the diaphragm;

[0053] S3, the film feeding roller group moves from left to right along the first direction so that the separator covers the negative electrode sheet; S4, the positive electrode sheet is placed on the above-mentioned separator using the first manipulator;

[0054] S5, the film feeding roller group moves from right to left along the second direction so that the separator covers the positive electrode sheet;

[0055] S6. Place the negative electrode sheet on the separator using a second manipulator;

[0056] S7, the film feeding roller group moves from left to right so that the separator covers the negative electrode sheet;

[0057] Repeat steps S4 to S7 until the number of battery cell layers reaches the predetermined requirement;

[0058] S8, adsorbing and pulling the diaphragm through the diaphragm reversing device so that the diaphragm can be pressed onto the stacking platform;

[0059] S9, the film feeding roller group drives the diaphragm to move from right to left, keeps the diaphragm pressed on the lamination platform, and cuts the diaphragm;

[0060] S10, remove the stacked battery cells;

[0061] Repeat steps S2 to S10.

[0062] Using the above method, after each lamination, the diaphragm is first adsorbed and pulled by the diaphragm reversing device, thereby ensuring that the diaphragm can still maintain tension after being cut, improving the efficiency and quality of the diaphragm when it is re-laid on the table, thereby improving the production efficiency and production quality of the laminated battery cell.

[0063] In this embodiment, the diaphragm is reversed by first adsorption and then the direction of the diaphragm is achieved by moving the film feeding roller group; and in some diaphragm providing mechanisms with blowing function, the diaphragm can also be blown first to make the diaphragm complete the reverse direction, and then the reversed diaphragm is pulled by the adsorption mechanism to achieve the flipping of the diaphragm.

[0064] In this embodiment, the diaphragm pulling mechanism 600 employs a vacuum suction structure. The diaphragm pulling mechanism 600 comprises a vacuum box 610, the lower surface of which is secured to the connecting plate 521 by bonding or bolting. The upper surface of the vacuum box 610 is provided with multiple small vents evenly distributed across the surface of the vacuum box 610. A suction port is provided on the side of the vacuum box 610. The vacuum box 610 has an internal cavity, with the suction port and vents both communicating with the cavity. During operation, the suction port is connected to a vacuum generator (e.g., a vacuum pump), which creates a negative pressure within the cavity. When the diaphragm covers the vents on the vacuum box 610, the negative pressure within the cavity attracts the diaphragm, keeping it firmly attached to the upper surface of the vacuum box 610. When the reversing seat 520 causes the vacuum box 610 to flip, the negative pressure within the cavity is maintained, allowing the diaphragm to flip with the reversal of the vacuum box 610.

[0065] In addition to utilizing a vacuum adsorption structure, the diaphragm traction mechanism 600 may also utilize a clamping structure. For example, the clamping mechanism is provided with a plurality of clamping claws, which are used to clamp the diaphragm and pull the diaphragm under the action of a flipping assembly. By utilizing a pneumatic clamp, the pneumatic clamp is mounted on a connecting plate. When working, the diaphragm is clamped by the pneumatic clamp, and then the diaphragm is driven to flip, and then buckled onto the lamination platform. Alternatively, when laminating, the film cutting operation is performed first. At this time, the diaphragm is in a tension-free state. At this time, the free end of the diaphragm is clamped by the clamping claws of the clamping mechanism, and then the diaphragm is driven to flip at the same time by the clamping claws. This makes the positioning accuracy of the diaphragm higher and the flipping efficiency is also improved.

[0066] In addition, in this embodiment, the flip motor 530 is located behind the lamination platform 100, the rotating shaft is located in front of the lamination platform, and the axis of the output shaft of the flip motor 530 substantially overlaps with the axis of the rotating shaft. Specifically, the flip motor 530 is a servo motor, the housing of the flip motor 530 being fixed to the mounting bracket 510, and the output shaft of the flip motor 530 being drivingly connected to the flip plate 522. When the output shaft rotates, it simultaneously drives the rear flip plate 522 to rotate. Because the two flip plates 522 are connected by a connecting plate 521, the front and rear flip plates 522 also rotate simultaneously, driving the diaphragm traction mechanism 600 on the connecting plate 521 to flip.

[0067] As a further preferred embodiment, a reduction gearbox can be additionally provided between the flip motor 530 and the flip plate 522. The output shaft of the flip motor 530 first passes through the reduction gearbox before driving the flip seat to rotate. Because servo motors rotate at high speeds, directly driving the flip seat with the servo motor can easily result in uneven rotation. However, using a reduction gearbox to reduce speed before driving the flip seat allows for smoother and more stable rotation.

[0068] Furthermore, to ensure that the flip seat 520 can flip into position, a preferred embodiment further includes a sensor plate disposed on the flip plate 522. Correspondingly, a sensor is disposed on the mounting bracket 510, and the sensor is electrically connected to the flip motor 530. The sensor determines whether the flip seat 520 has flipped into position during operation, ensuring that the flip seat 520 can accurately move back and forth between the first and second workstations. Two sensors may be provided, corresponding to the positions of the flip seat in the first and second workstations, respectively.

[0069] During the production process, each time the positive or negative electrode sheet is placed, or the separator is laid, the semi-finished battery cell should be pressed tightly to prevent the positive or negative electrode sheet from accidentally detaching from the separator. Figure 3 , the stacking platform 100 is also provided with a clamping mechanism 700. There are two groups of the clamping mechanism 700, and the two groups of the clamping mechanism 700 are respectively located on the left and right sides of the stacking platform. The clamping mechanism 700 includes a pressing knife 710 and a driving mechanism 720 that drives the pressing knife 710 to move along the front-back direction. During production, when the positive electrode sheet needs to be placed on the stacking platform 100, the pressing knife 710 of the clamping mechanism 700 on the left side is relatively far away from the stacking platform. Then, when the positive electrode sheet is placed on the stacking platform 100, the pressing knife 710, driven by the driving mechanism 720, approaches the stacking platform 100 and presses on top of the positive electrode sheet, thereby compacting the entire stacked battery cell; then, when the negative electrode sheet needs to be placed on the stacking platform, similarly, the clamping mechanism 700 on the right side is activated, first making way for the negative electrode sheet to be placed on the stacking platform, and then, after placement, the stacking is compacted. This cycle is repeated, and the alternating actions of the two pressing knives 710 are utilized to compact the battery cells during each stacking process, thereby ensuring that the semi-finished battery cells are always in a stably clamped state during the production process.

[0070] In addition, the positive electrode sheet providing mechanism 200 of the laminated battery preparation system also includes the automatic preparation of positive electrode sheets, which includes an electrode sheet cutting unit and an electrode sheet correction unit. During production, the positive electrode sheet providing mechanism 200 automatically loads, automatically connects, cuts, detects electrode size, detects electrode defects, transports, and positions and corrects the positive electrode sheets; the positive electrode sheets are automatically produced and stacked on the positive electrode sheet table, and then the first manipulator 210 is used to move back and forth between the positive electrode sheet table and the stacking platform, and each positive electrode sheet is sent to the stacking platform for stacking. The first manipulator 210 may include structures such as suction cups and lifting units to meet the needs of transportation. Similarly, the negative electrode sheet providing mechanism 300 also has the function of automatic preparation of negative electrode sheets. The specific structure of the negative electrode sheet providing mechanism 300 can refer to the positive electrode sheet providing mechanism 200, and will not be repeated here.

[0071] To further enhance production automation, the membrane supply mechanism 400 also includes a base plate, an unwinding assembly, a tension detector, and a membrane buffer unit. The unwinding assembly is mounted on the base plate. After passing through the unwinding assembly, the membrane passes through the tension detector, the membrane buffer unit, and a film feed roller assembly. During production, a roll of membrane material is placed on the base plate. The membrane material then passes through the unwinding assembly, the tension detector, the membrane buffer unit, and the film feed roller assembly 410. The film feed roller assembly 410 comprises two rollers positioned close to each other, ensuring smooth film delivery, whether moving from left to right or right to left. Furthermore, during unwinding, the tension detector and the membrane buffer unit provide effective feedback control of the membrane's unwinding tension, preventing creases from being formed during the unwinding process due to insufficient tension, which could affect product quality, or production abnormalities due to excessive tension. Furthermore, the membrane supply mechanism 400 may also include an automatic splicing unit and a membrane defect detection unit, thereby enhancing production automation and improving product quality.

[0072] Since both the positive and negative electrode sheets have a certain thickness, the thickness of the laminated battery core will gradually increase as the laminated chips are continuously stacked. In order to ensure that the movement trajectories of the first and second manipulators are the same each time, as a further preferred embodiment, the lamination platform 100 includes a platform support 110, a lifting assembly 130, and a table 120. The lifting assembly 130 is mounted on the platform support 110, and the table 120 is connected to the platform support 110 by the lifting assembly 130 for vertical sliding. The table is continuously raised and lowered during the lamination process, so that the operating height position of each lamination operation remains unchanged, thereby improving the product quality of the battery cell lamination.

[0073] As a further preferred embodiment, after step S10, the battery cells are subjected to a glue treatment. After the battery cells are stacked, the battery cells are removed and glued to separate the electrode sheets and the separator.

[0074] The diaphragm flipping mechanism of the present application is suitable for a Z-shaped stacking preparation system, which enables the diaphragm to be constantly adsorbed or pulled under the action of the diaphragm reversal device, thereby being flipped; in particular, when the diaphragm is adsorbed, with the adsorbed diaphragm as the starting point, the folding angle of the diaphragm in the stacking preparation is <90°, thereby making the diaphragm smoother and smoother when reversed.

[0075] The above specifically describes the preferred embodiments of the present invention, but the invention is not limited to the embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A laminated battery cell preparation system, characterized by: Including rack; a diaphragm providing mechanism for providing a diaphragm; A positive electrode sheet providing mechanism, used for providing prepared positive electrode sheets; A negative electrode sheet providing mechanism, used for providing prepared negative electrode sheets; The stacking mechanism includes a stacking platform, which is used for preparing battery cells with diaphragms, positive pole pieces and negative pole pieces. The stacking mechanism is equipped with a diaphragm reversal device, which includes a flipping assembly and a diaphragm traction mechanism. The flipping assembly includes a flipping seat, which is movably connected to the stacking platform, and the diaphragm traction mechanism is installed on the flipping seat; the flipping seat includes a first station and a second station. When the flipping seat is located at the first station, the diaphragm traction mechanism is located on one side of the stacking platform. When the flipping seat is located at the second station, the diaphragm traction mechanism pulls the diaphragm onto the stacking platform.

2. The laminated battery core preparation system according to claim 1, characterized in that: The diaphragm traction mechanism can be fixed relatively to one end of the diaphragm and drive the diaphragm to move. The diaphragm traction mechanism is a vacuum mechanism. The vacuum mechanism includes an upper surface and an inner cavity. A plurality of air vents are provided on the upper surface. The air vents are connected to the inner cavity. An air suction port is also provided on the side of the vacuum mechanism. The air suction port is connected to the inner cavity.

3. The laminated battery core preparation system according to claim 1, characterized in that: The diaphragm traction mechanism can be fixed relatively to one end of the diaphragm and drive the diaphragm to move. The diaphragm traction mechanism is a clamping mechanism, which is provided with a plurality of clamping claws. The clamping claws are used to clamp the diaphragm and pull the diaphragm under the action of the flip assembly.

4. The laminated battery core preparation system according to claim 1, characterized in that: The diaphragm reversing device is installed on the side of the lamination mechanism close to the negative electrode sheet providing mechanism, and the diaphragm reversing device drives the diaphragm to reverse from the negative electrode sheet providing mechanism side to the positive electrode sheet providing mechanism side.

5. The laminated battery core preparation system according to claim 1, characterized in that: The flip seat is rotatably connected to the stacking platform, the flip assembly includes a mounting bracket, the mounting bracket is provided with a flip drive unit, the flip drive unit includes a shell and an output shaft, the shell is fixed to the mounting bracket, the output shaft is drive-connected to the flip seat, the flip seat includes a connecting plate and a flip plate, the diaphragm traction mechanism is fixed on the connecting plate, the flip plates are provided with two pieces, the two flip plates are respectively located on both sides of the connecting plate, one of the flip plates is connected to the output shaft, and the other flip plate is connected to the mounting bracket through a rotating shaft, and the axis of the rotating shaft is located outside the diaphragm traction mechanism.

6. The laminated battery core preparation system according to claim 1, characterized in that: The lamination platform is further provided with a pressing mechanism; the pressing mechanism comprises a pressing knife and a driving mechanism, and the driving mechanism drives the pressing knife to be movably connected relative to the lamination platform.

7. The laminated battery core preparation system according to claim 1, characterized in that: A film cutting mechanism is also provided next to the lamination platform, and the film cutting mechanism cuts the diaphragm when the battery cell is prepared. The film cutting mechanism is arranged between the positive electrode sheet providing mechanism and the negative electrode sheet providing mechanism.

8. The laminated battery core preparation system according to claim 1, characterized in that: The positive electrode sheet providing mechanism includes a positive electrode sheet cutting unit and a positive electrode sheet deviation correction unit; the negative electrode sheet providing mechanism includes a negative electrode sheet cutting unit and a negative electrode sheet deviation correction unit.

9. The laminated battery core preparation system according to claim 1, characterized in that: The diaphragm providing mechanism also includes a base plate, an unwinding assembly, a tension detector, and a diaphragm buffer unit. The unwinding assembly is arranged on the base plate. After passing through the unwinding assembly, the diaphragm passes through the tension detector, the diaphragm buffer unit, and the film feeding roller group in sequence.

10. The laminated battery core preparation system according to claim 1, characterized in that: The stacking mechanism includes a platform bracket, a lifting component, and a table top. The lifting component is installed on the platform bracket, and the table top is connected to the platform bracket through the lifting component for vertical sliding connection.

11. The laminated battery core preparation system according to claim 1, characterized in that: The diaphragm providing mechanism includes a film feeding roller pair, the lamination mechanism is fixedly installed relative to the frame, the film feeding roller pair is installed above the lamination mechanism and slides left and right relative to the lamination mechanism, and the movable distance of the film feeding roller pair is the same as the size of the lamination platform.

12. The laminated battery core preparation system according to claim 1, characterized in that: The positive electrode sheet providing mechanism includes a first manipulator, and the negative electrode sheet providing mechanism includes a second manipulator. The positive electrode sheet providing mechanism is located on the left side of the stacking mechanism, and the negative electrode sheet providing mechanism is located on the right side of the stacking platform. The first manipulator and the second manipulator are both slidably connected to the frame.

13. A method for preparing laminated battery cells using the laminated battery cell preparation system according to any one of claims 1 to 12, wherein the diaphragm pulling mechanism of the laminated battery cell preparation system is a vacuum mechanism, and an air extraction port is further provided on the side of the vacuum mechanism; the diaphragm supply mechanism includes a film feeding roller group, the positive electrode sheet supply mechanism includes a first manipulator, and the negative electrode sheet supply mechanism includes a second manipulator; characterized in that: The steps include: S1. Use the film feeding roller group to lay the diaphragm flat on the lamination platform. At this time, the film feeding roller group is located above one side of the lamination platform; S2, using the second manipulator to place the negative electrode sheet on the diaphragm; S3, the film feeding roller group moves along the first direction so that the separator covers the negative electrode sheet; S4, using a first manipulator to place the positive electrode sheet on the above-mentioned diaphragm; S5, the film feeding roller group moves along a second direction so that the separator covers the positive electrode sheet; the second direction is opposite to the first direction; S6. Place the negative electrode sheet on the separator using a second manipulator; S7, the film feeding roller group moves along the first direction so that the separator covers the negative electrode sheet; Repeat steps S4 to S7 until the number of battery cell layers reaches the predetermined requirement; S8, adsorbing and pulling the diaphragm through the diaphragm reversing device so that the diaphragm can be pressed onto the stacking platform; S9, the film feeding roller group drives the diaphragm to move along the second direction, keeps the diaphragm pressed on the lamination platform, and cuts the diaphragm; S10, remove the stacked battery cells; Repeat steps S2 to S10.

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