Battery cell lamination device and battery cell lamination apparatus

Abstract

The utility model provides a kind of electric core lamination device and electric core lamination equipment, it is related to the technical field of battery, and the electric core lamination device includes: lamination table and the diaphragm unwinding mechanism, tension mechanism, flattening roller mechanism, connecting rod and pole piece handling mechanism placed in the lamination table top;Flattening roller mechanism is located below connecting rod, including first flattening roller and second flattening roller, gap is equipped between two flattening rollers to make diaphragm pass, for guiding the diaphragm that passes to lamination table;The device is reciprocated left and right above lamination table by flattening roller mechanism driven by connecting rod, can eliminate the redundancy or folding of diaphragm, to reduce the technical problem that existing diaphragm wrinkle, diaphragm folding deformation etc. cause pole piece damage in prior art, reduce the technical effect of the bad rate of electric core, reduce production cost.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a cell stacking device and a cell stacking equipment. Background Technology

[0002] In the production of lithium-ion batteries, the stacking process is widely used in battery cell manufacturing because it better meets the requirements for uniform and parallel movement of lithium ions. Z-shaped stacking technology is a simple and easy-to-implement stacking process that forms a Z-shaped structure by alternately stacking electrodes and separators, thus creating a multi-layered cell. Existing stacking processes often suffer from electrode damage due to separator wrinkles, folds, and deformation, leading to higher cell defect rates and increased production costs. Utility Model Content

[0003] The purpose of this invention is to provide a cell stacking device and a cell stacking equipment to reduce the technical problems of electrode damage caused by diaphragm wrinkles, diaphragm folding and deformation in the prior art.

[0004] In a first aspect, this utility model provides a battery cell stacking device, comprising: a stacking table and a diaphragm unwinding mechanism, a tension mechanism, a smoothing roller mechanism, a connecting rod, and an electrode conveying mechanism disposed above the stacking table; wherein the smoothing roller mechanism and the electrode conveying mechanism are both fixedly connected to the connecting rod; the diaphragm unwinding mechanism is located above the connecting rod and is used to fix the diaphragm roll; the tension mechanism is located in the unwinding direction of the diaphragm unwinding mechanism and is used to adjust the tension of the unwound diaphragm; the smoothing roller mechanism is located below the connecting rod; the smoothing roller mechanism is located below the connecting rod; the tension mechanism is located above the connecting rod; the tension ... The flat roller mechanism includes a first flat roller and a second flat roller. The axes of the first flat roller and the second flat roller are respectively arranged perpendicular to the movement direction of the connecting rod. A gap is provided between the first flat roller and the second flat roller to allow the diaphragm to pass through. The connecting rod is located above the stacking table and performs linear reciprocating motion along a direction perpendicular to the axis of the diaphragm roll, thereby driving the diaphragm passing through the gap to be placed on the stacking table. At the same time, it drives the electrode transport mechanism to move to the stacking table above where the diaphragm is placed for stacking.

[0005] In an optional embodiment, the diaphragm unwinding mechanism includes an unwinding roller and a driving member; one end of the unwinding roller is fixedly connected to the output end of the driving member, and the unwinding roller is fixedly connected to the diaphragm roll.

[0006] In an optional embodiment, the tension mechanism includes: a tension fixing roller and a tension adjusting assembly; the tension fixing roller and the tension adjusting assembly are located on one side of the diaphragm unwinding mechanism; the tension adjusting assembly includes a tension swing arm and a movable tension roller, wherein the tension swing arm includes a moving end and a fixed end; the center of the movable tension roller is located at the moving end of the tension swing arm; the tension swing arm rotates the movable tension roller within a preset angle range with the fixed end as the center and the length of the tension swing arm as the radius.

[0007] In an optional embodiment, both the first smoothing roller and the second smoothing roller are provided with a heating mechanism.

[0008] In an optional embodiment, the above device further includes a diaphragm buffer mechanism located below the diaphragm unwinding mechanism; the diaphragm buffer mechanism includes N fixed buffer rollers and N-1 movable buffer rollers, with a movable buffer roller disposed between two adjacent fixed buffer rollers, and the distance between the movable buffer roller and the two adjacent fixed buffer rollers is adjustable, where N is an integer not less than 2.

[0009] In an optional embodiment, the above device further includes a film-coating roller mechanism located above the smoothing roller mechanism; the film-coating roller mechanism includes a first film-coating roller and a second film-coating roller, the axis of the first film-coating roller and the axis of the second film-coating roller are respectively arranged perpendicular to the movement direction of the connecting rod, and a gap is provided between the first film-coating roller and the second film-coating roller to allow the diaphragm to pass through.

[0010] In an optional embodiment, the device further includes a drive roller disposed between the diaphragm buffer mechanism and the film-coating roller mechanism.

[0011] In an optional embodiment, the electrode transport mechanism includes a positive electrode transport mechanism and a negative electrode transport mechanism; both the positive electrode transport mechanism and the negative electrode transport mechanism are located below the connecting rod. The aforementioned positive electrode transport mechanism includes: a first positive electrode transport mechanism and a second positive electrode transport mechanism; the first positive electrode transport mechanism and the second positive electrode transport mechanism are disposed on one side of the aforementioned smoothing roller mechanism, and the second positive electrode transport mechanism is located between the first positive electrode transport mechanism and the aforementioned smoothing roller mechanism; the aforementioned negative electrode transport mechanism includes: a first negative electrode transport mechanism and a second negative electrode transport mechanism; the first negative electrode transport mechanism and the second negative electrode transport mechanism are disposed on the other side of the aforementioned smoothing roller mechanism, and the second negative electrode transport mechanism is located between the aforementioned smoothing roller mechanism and the aforementioned first negative electrode transport mechanism; the distance between the aforementioned smoothing roller mechanism and the aforementioned second positive electrode transport mechanism is equal to the distance between the aforementioned smoothing roller mechanism and the aforementioned second negative electrode transport mechanism.

[0012] In an optional embodiment, the above-mentioned device further includes: a positive electrode sheet transmission mechanism, a positive electrode sheet correction stage, a negative electrode sheet transmission mechanism, and a negative electrode sheet correction stage; the positive electrode sheet transmission mechanism, the positive electrode sheet correction stage, the negative electrode sheet transmission mechanism, the negative electrode sheet correction stage, and the stacking stage are all arranged on the same horizontal line. The aforementioned positive electrode transfer mechanism and the aforementioned positive electrode correction stage are disposed on one side of the aforementioned stacking stage; the aforementioned positive electrode correction stage is located between the aforementioned positive electrode transfer mechanism and the aforementioned stacking stage; the distance between the aforementioned positive electrode transfer mechanism and the aforementioned positive electrode correction stage is equal to the distance between the aforementioned first positive electrode transport mechanism and the aforementioned second positive electrode transport mechanism; the aforementioned negative electrode transfer mechanism and the aforementioned negative electrode correction stage are disposed on the other side of the aforementioned stacking stage; the aforementioned negative electrode correction stage is located between the aforementioned negative electrode transfer mechanism and the aforementioned stacking stage; the distance between the aforementioned negative electrode transfer mechanism and the aforementioned negative electrode correction stage is equal to the distance between the aforementioned first negative electrode transport mechanism and the aforementioned second negative electrode transport mechanism.

[0013] Secondly, this utility model provides a battery cell stacking device, including a motor, a cylinder, and a battery cell stacking apparatus as described in any optional embodiment of the first aspect, controlled by the motor and the cylinder.

[0014] This utility model provides a battery cell stacking device and a battery cell stacking equipment. The battery cell stacking device includes: a stacking table and a diaphragm unwinding mechanism, a tension mechanism, a smoothing roller mechanism, a connecting rod, and an electrode conveying mechanism placed above the stacking table; the smoothing roller mechanism and the electrode conveying mechanism are both fixedly connected to the connecting rod; the diaphragm unwinding mechanism is located above the connecting rod and is used to fix the diaphragm roll; the tension mechanism is located in the unwinding direction of the diaphragm unwinding mechanism and is used to adjust the tension of the diaphragm; the smoothing roller mechanism is located below the connecting rod and includes a first smoothing roller and a second smoothing roller, the axes of the two smoothing rollers are respectively arranged perpendicular to the movement direction of the connecting rod, and a gap is provided between them to allow the diaphragm to pass through; the connecting rod is located above the stacking table and makes linear reciprocating motion in a direction perpendicular to the axis of the diaphragm roll, driving the diaphragm passing through the gap to be placed on the stacking table; at the same time, it drives the electrode conveying mechanism to run above the stacking table where the diaphragm is placed for stacking. This cell stacking device drives a smoothing roller mechanism to reciprocate left and right above the stacking table via a connecting rod. This can eliminate redundancy or folding of the diaphragm, thereby reducing the technical problems of electrode damage caused by diaphragm wrinkles and folding deformation in the prior art. This achieves the technical effect of reducing the defect rate of the cells and reducing production costs. Attached Figure Description

[0015] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is one of the structural schematic diagrams of a battery cell stacking device provided in an embodiment of the present utility model; Figure 2 A second schematic diagram of a cell stacking device provided for an embodiment of this utility model; Figure 3 A schematic diagram of a tension mechanism provided in an embodiment of this utility model; Figure 4 A third schematic diagram of a battery cell stacking device provided for an embodiment of this utility model; Figure 5 A schematic diagram of a diaphragm buffer mechanism provided in an embodiment of this utility model; Figure 6 A fourth schematic diagram of a cell stacking device provided for an embodiment of this utility model; Figure 7 Fifth schematic diagram of a cell stacking device provided for an embodiment of this utility model; Figure 8 A schematic diagram of the structure of a cell stacking device in its first working state, provided for an embodiment of this utility model; Figure 9 This is a schematic diagram of the structure of a cell stacking device in the second working state, provided as an embodiment of the present invention.

[0017] Icons: 100-Separator unwinding mechanism; 200-Tension mechanism; 300-Smoothing roller mechanism; 400-Connecting rod; 500-Electrode handling mechanism; 600-Stacking table; 700-Dual film roller mechanism; 800-Membrane buffer mechanism; 900-Drive roller; 110-Separator roll; 120-Unwinding roller; 210-Tension fixing roller; 220-Tension adjusting assembly; 230-Tension swing arm; 240-Modible tension roller; 310-First smoothing roller; 320-Second smoothing roller; 510-First positive electrode handling mechanism; 520-Second positive electrode. Transport mechanism; 530-First negative electrode sheet transport mechanism; 540-Second negative electrode sheet transport mechanism; 601-Separator; 610-Positive electrode sheet transport mechanism; 620-Positive electrode sheet alignment table; 630-Negative electrode sheet transport mechanism; 640-Negative electrode sheet alignment table; 710-First film-coating roller; 720-Second film-coating roller; 810-Buffer fixed roller; 820-Buffer movable roller; 811-First buffer fixed roller; 812-Second buffer fixed roller; 813-Third buffer fixed roller; 821-First buffer movable roller; 822-Second buffer movable roller. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0020] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0021] Existing methods for improving separator wrinkles and folding deformations generated during the cell stacking process generally include: pre-treating the separator in a treatment bath containing a specific organic solvent before stacking to release separator stress in advance; or performing hot / cold pressing treatment on the cell after stacking. However, both of these methods increase the number of cell manufacturing steps, significantly affecting production efficiency and increasing production costs.

[0022] Based on this, the present invention provides a cell stacking device and a cell stacking equipment to reduce the technical problems of electrode damage caused by diaphragm wrinkles, diaphragm folding deformation and other conditions existing in the prior art.

[0023] The following detailed description, in conjunction with the accompanying drawings, outlines some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0024] To facilitate understanding of this embodiment, a detailed description of a cell stacking device disclosed in this utility model embodiment will be provided first. Figure 1 This is a schematic diagram of a battery cell stacking device provided in an embodiment of this application. The device includes: a diaphragm unwinding mechanism 100, a tensioning mechanism 200, a smoothing roller mechanism 300, a connecting rod 400, an electrode conveying mechanism 500, and a stacking table 600.

[0025] The diaphragm unwinding mechanism 100, tension mechanism 200, smoothing roller mechanism 300, connecting rod 400 and electrode transport mechanism 500 are all located above the stacking table 600; the smoothing roller mechanism 300 and the electrode transport mechanism 500 are both fixedly connected to the connecting rod 400.

[0026] The aforementioned diaphragm unwinding mechanism 100 is located above the connecting rod 400 and is used to fix the diaphragm roll 110; the aforementioned tension mechanism 200 is located in the unwinding direction of the diaphragm unwinding mechanism 100 and is used to adjust the tension of the unwound diaphragm.

[0027] The smoothing roller mechanism 300 is located below the connecting rod 400. The smoothing roller mechanism includes a first smoothing roller 310 and a second smoothing roller 320. The axis of the first smoothing roller 310 and the axis of the second smoothing roller 320 are respectively arranged perpendicular to the movement direction of the connecting rod 400. A gap is provided between the first smoothing roller 310 and the second smoothing roller 320 to allow the diaphragm to pass through, thereby achieving the purpose of guiding the diaphragm passing through the gap to be placed on the stacking table 600.

[0028] The aforementioned connecting rod 400 is located above the stacking table 600 and moves in a straight reciprocating motion along the axis perpendicular to the diaphragm roll 110, thereby driving the diaphragm passing through the aforementioned gap to be placed on the stacking table 600; at the same time, it drives the electrode transport mechanism 500 to move above the stacking table 600 where the diaphragm is placed for stacking.

[0029] In one embodiment, see Figure 2 As shown, the diaphragm unwinding mechanism 100 includes an unwinding roller 120 and a driving member; one end of the unwinding roller 120 is fixedly connected to the output end of the driving member, and the unwinding roller 120 is fixedly connected to the diaphragm roll 110.

[0030] The diaphragm unwinding mechanism 100 is typically located at the top of the horizontal space of the entire cell stacking device. The driving component can be a first drive motor, which drives the unwinding roller 120 to rotate in order to achieve the purpose of unwinding the diaphragm.

[0031] In one embodiment, the tension mechanism 200 includes a tension fixing roller 210 and a tension adjusting component 220; the tension fixing roller 210 and the tension adjusting component 220 are located on one side of the diaphragm unwinding mechanism 100.

[0032] The tension adjustment assembly 220 includes a tension swing arm 230 and a movable tension roller 240, wherein the tension swing arm 230 includes a moving end and a fixed end; the center of the movable tension roller 240 is located at the moving end of the tension swing arm 230.

[0033] The tension swing arm 230, with its fixed end as the center and its length as the radius, drives the movable tension roller 240 to rotate within a preset angle range.

[0034] As a concrete example, see Figure 3 The diagram shows a structural schematic of a tension mechanism. The circle indicated by the dashed line has its center at the fixed end of the tension swing arm 230 and its radius as the length of the tension swing arm 230. The movement trajectory of the center of the movable tension roller 240 lies on the arc of the circle indicated by the dashed line.

[0035] The preset angle range can be 90 degrees, i.e. Figure 3 As shown in (A) to (C), the rotation angle of the tension swing arm 230 can be controlled by a cylinder, for example, the tension swing arm 230 can rotate within a preset 90-degree range, thereby driving the movable tension roller 240 to move within the range of (A) to (C); or the position of the moving end of the tension swing arm 230 can be controlled by a cylinder, for example, the moving end of the tension swing arm 230 can move from a horizontal position to a vertical position, the horizontal position corresponding to Figure 3 As shown in section (A), this vertical position corresponds to Figure 3 As shown in section (C).

[0036] In this embodiment, the tension swing arm 230 is controlled by a cylinder to change the distance between the centers of the movable tension roller 240 and the fixed tension roller 210, so as to adjust the tension of the diaphragm transported by the diaphragm unwinding mechanism 100 and transport the adjusted diaphragm to the downstream mechanism of the tension mechanism 200.

[0037] The downstream mechanism here can refer to the mechanism following the tension mechanism 200 in the diaphragm transmission direction, and correspondingly, the diaphragm unwinding mechanism 100 is the upstream mechanism of the tension mechanism 200.

[0038] In one embodiment, both the first smoothing roller 310 and the second smoothing roller 320 are provided with a heating mechanism for heating and smoothing the diaphragm placed on the stacking table 600.

[0039] In other words, the first smoothing roller 310 and the second smoothing roller 320 can be two identical smoothing rollers arranged side by side with heating function, used to pass the transported diaphragm through the gap between the two smoothing rollers, guide the passed diaphragm to the stacking table 600, and heat and smooth the diaphragm placed on the stacking table 600.

[0040] As a specific example, the heating mechanism described above may embed heating elements, such as heating wires or ceramic heaters, in the first smoothing roller 310 and the second smoothing roller 320, without specific limitations. Furthermore, temperature sensors (such as thermocouples) may be installed near the smoothing roller mechanism 300 or directly integrated into the first smoothing roller 310 and the second smoothing roller 320 to monitor temperature changes during the heating process in real time.

[0041] Heating the diaphragm during the lamination process typically improves the adhesion between the diaphragm and the electrode, thereby mitigating defects such as wrinkles and folds in the diaphragm. Since different diaphragm materials require different heating temperatures, using a smoothing roller mechanism 300 with a heating function to heat specific types of diaphragms with better surface heat-melting effects can achieve better shaping and smoothing results.

[0042] In one embodiment, see Figure 2 and Figure 4 As shown, the above-mentioned cell stacking device may further include a film-coating roller mechanism 700, located above the smoothing roller mechanism 300. The film-coating roller mechanism 700 includes a first film-coating roller 710 and a second film-coating roller 720. The axis of the first film-coating roller 710 and the axis of the second film-coating roller 720 are respectively arranged perpendicular to the movement direction of the connecting rod 400. A gap is provided between the axis of the first film-coating roller 710 and the axis of the second film-coating roller 720 to allow the diaphragm to pass through, thereby fixing the transmission direction of the diaphragm passing through the gap and guiding the diaphragm to the smoothing roller mechanism 300, thereby ensuring the accurate orientation of the diaphragm during the stacking operation.

[0043] In one embodiment, see Figure 4As shown, the above-mentioned cell stacking device may further include a diaphragm buffer mechanism 800, which may be disposed below the diaphragm unwinding mechanism 100. The diaphragm buffer mechanism 800 includes N buffer fixed rollers 810 and N-1 buffer movable rollers 820. A buffer movable roller 820 is disposed between two adjacent buffer fixed rollers 810. The distance between the buffer movable roller 820 and the two adjacent buffer fixed rollers 810 is adjustable, and N is an integer not less than 2.

[0044] The two adjacent buffer fixed rollers 810 can refer to the two buffer fixed rollers 810 being adjacent in the horizontal direction, the two buffer fixed rollers 810 being adjacent in the vertical direction, or the two buffer fixed rollers 810 being adjacent in the transport direction of the diaphragm.

[0045] The specific positions of the aforementioned buffer fixed roller 810 and buffer movable roller 820 are not limited. For example, N buffer fixed rollers 810 can be on a straight line in the vertical or horizontal direction, and N-1 buffer movable rollers 820 can be on another straight line in the vertical or horizontal direction.

[0046] As a concrete example, see Figure 4 As shown, the diaphragm buffer mechanism 800 may include two fixed buffer rollers 810 and one movable buffer roller 820. The movable buffer roller 820 is disposed between the two fixed buffer rollers 810. The diaphragm transported by the tension mechanism 200 passes through the fixed buffer roller 810, the movable buffer roller 820 and the fixed buffer roller 810 in sequence before being transported to the downstream mechanism.

[0047] As another concrete example, see Figure 5 As shown, the diaphragm buffer mechanism 800 may include three fixed buffer rollers 810 and two movable buffer rollers 820. The fixed buffer rollers 810 include a first fixed buffer roller 811, a second fixed buffer roller 812 and a third fixed buffer roller 813. The movable buffer rollers 820 include a first movable buffer roller 821 and a second movable buffer roller 822.

[0048] The first buffer fixed roller 811 and the second buffer fixed roller 812 are two adjacent buffer fixed rollers, and a first buffer movable roller 821 with an adjustable distance between them is provided; the second buffer fixed roller 812 and the third buffer fixed roller 813 are two adjacent buffer fixed rollers, and a second buffer movable roller 822 with an adjustable distance between them is provided.

[0049] The first buffer movable roller 821 and the second buffer movable roller 822 can move horizontally under the control of the second drive motor, thereby changing the distance between them and the corresponding buffer fixed roller, so as to achieve the purpose of storing and releasing the diaphragm.

[0050] In one embodiment, the above-described cell stacking device may further include a drive roller 900, see [link to documentation]. Figure 4 As shown, the drive roller 900 is disposed between the diaphragm buffer mechanism 800 and the film-coating roller mechanism 700.

[0051] The drive roller 900 can be rotated by a third drive motor to provide power for the transport of the diaphragm. This third drive motor can be the same motor as the first drive motor that controls the rotation of the unwinding roller 120, or it can be a separately controlled motor that is not the same as the first drive motor.

[0052] In one embodiment, the electrode transport mechanism 500 includes a positive electrode transport mechanism and a negative electrode transport mechanism; both the positive and negative electrode transport mechanisms are located below the connecting rod 400. The positive electrode transport mechanism is used to transport the positive electrode, and the negative electrode transport mechanism is used to transport the negative electrode.

[0053] Combination Figure 6 As shown, the above-mentioned positive electrode sheet transport mechanism includes: a first positive electrode sheet transport mechanism 510 and a second positive electrode sheet transport mechanism 520; the first positive electrode sheet transport mechanism 510 and the second positive electrode sheet transport mechanism 520 are disposed on one side of the smoothing roller mechanism 300, and the second positive electrode sheet transport mechanism 520 is located between the first positive electrode sheet transport mechanism 510 and the smoothing roller mechanism 300.

[0054] The negative electrode sheet transport mechanism includes: a first negative electrode sheet transport mechanism 530 and a second negative electrode sheet transport mechanism 540; the first negative electrode sheet transport mechanism 530 and the second negative electrode sheet transport mechanism 540 are disposed on the other side of the smoothing roller mechanism 300, and the second negative electrode sheet transport mechanism 540 is located between the smoothing roller mechanism 300 and the first negative electrode sheet transport mechanism 530.

[0055] The distance between the smoothing roller mechanism 300 and the second positive electrode transport mechanism 520 is equal to the distance between the smoothing roller mechanism 300 and the second negative electrode transport mechanism 540.

[0056] As a specific example, the first positive electrode transport mechanism 510, the second positive electrode transport mechanism 520, the first negative electrode transport mechanism 530, the second negative electrode transport mechanism 540, and the smoothing roller mechanism 300 are all fixed to the connecting rod 400 by a telescopic rod. The extension and retraction of the telescopic rod can be controlled by the fourth drive motor.

[0057] In this embodiment, the distance between the smoothing roller mechanism 300 and the second positive electrode transport mechanism 520 is equal to the distance between the smoothing roller mechanism 300 and the second negative electrode transport mechanism 540. That is, the distance between the telescopic rod corresponding to the smoothing roller mechanism 300 and the telescopic rod corresponding to the second positive electrode transport mechanism 520 on the connecting rod 400 is equal to the distance between the telescopic rod corresponding to the smoothing roller mechanism 300 and the telescopic rod corresponding to the second negative electrode transport mechanism 540 on the connecting rod 400.

[0058] As another specific example, the first positive electrode transport mechanism 510, the second positive electrode transport mechanism 520, the first negative electrode transport mechanism 530, and the second negative electrode transport mechanism 540 all carry suction cups, and the suction cups are all located below the first positive electrode transport mechanism 510, the second positive electrode transport mechanism 520, the first negative electrode transport mechanism 530, and the second negative electrode transport mechanism 540 (on the side in contact with the stacking stage 600). These suction cups are used to adsorb and release the electrodes, and can be controlled by a fifth drive motor.

[0059] In one embodiment, see Figure 7 As shown, the above-mentioned cell stacking device may further include: a positive electrode transfer mechanism 610, a positive electrode correction stage 620, a negative electrode transfer mechanism 630, and a negative electrode correction stage 640; the positive electrode transfer mechanism 610, the positive electrode correction stage 620, the negative electrode transfer mechanism 630, the negative electrode correction stage 640, and the stacking stage 600 are all arranged on the same horizontal line.

[0060] The positive electrode transfer mechanism 610 and the negative electrode transfer mechanism 630 may include corresponding transport belts and positioning sensors for transferring the positive and negative electrode sheets produced in the previous process to the stacking process. The positive electrode correction table 620 and the negative electrode correction table 640 may include limit blocks and position sensors for adjusting and correcting the positions of the positive and negative electrode sheets to ensure accurate positioning during stacking and meet the design requirements of the battery cell product.

[0061] The positive electrode transfer mechanism 610 and the positive electrode correction stage 620 are disposed on one side of the stacking stage 600; the positive electrode correction stage 620 is located between the positive electrode transfer mechanism 610 and the stacking stage 600. The distance between the positive electrode transfer mechanism 610 and the positive electrode correction stage 620 is equal to the distance between the first positive electrode transport mechanism 510 and the second positive electrode transport mechanism 520.

[0062] The negative electrode transfer mechanism 630 and the negative electrode alignment stage 640 are disposed on the other side of the stacking stage 600; the negative electrode alignment stage 640 is located between the negative electrode transfer mechanism 630 and the stacking stage 600. The distance between the negative electrode transfer mechanism 630 and the negative electrode alignment stage 640 is equal to the distance between the first negative electrode transport mechanism 530 and the second negative electrode transport mechanism 540.

[0063] In one embodiment, the first positive electrode plate handling mechanism 510 is used to adsorb a positive electrode plate from the positive electrode plate transfer mechanism 610 by means of a carrying suction cup; and to move the positive electrode plate above the positive electrode plate correction stage 620 by means of the horizontal (rightward) movement of the connecting rod 400; and at the same time, to release the positive electrode plate onto the positive electrode plate correction stage 620 by means of the corresponding carrying suction cup. The second positive electrode plate handling mechanism 520 is used to pick up the positive electrode plate from the positive electrode plate alignment stage 620 by means of a carrying suction cup; and to move the positive electrode plate above the stacking stage 600 by means of the horizontal (rightward) movement of the connecting rod 400; and at the same time, to release the positive electrode plate onto the stacking stage 600 by means of the corresponding carrying suction cup.

[0064] In one embodiment, the first negative electrode conveying mechanism 530 is used to adsorb a negative electrode from the negative electrode transfer mechanism 630 by means of a carrying suction cup; and to move the negative electrode above the negative electrode correction stage 640 by means of the horizontal (leftward) movement of the connecting rod 400; and at the same time, to release the negative electrode onto the negative electrode correction stage 640 by means of the corresponding carrying suction cup. The second negative electrode transfer mechanism 540 is used to pick up the negative electrode from the negative electrode alignment stage 640 by means of a suction cup; and to move the negative electrode above the stacking stage 600 by means of the horizontal (leftward) movement of the connecting rod 400; and at the same time, to release the negative electrode onto the stacking stage 600 by means of the corresponding suction cup.

[0065] The stacking table 600 is used to complete the main actions of the stacking process. The separator, negative electrode, separator, positive electrode, etc. are stacked alternately on the stacking table 600 in sequence. After multiple cycles, the battery cell assembly is completed.

[0066] As a specific example, the stacking stage 600 may include: a pressure knife, a pressure knife stroke cylinder, and a motion motor.

[0067] The pressing knife can be located above the stacking stage 600 and installed perpendicular to the surface of the stacking stage 600. It is used to press the positive electrode, negative electrode and separator in sequence to form the required stacked structure. The pressing knife can apply appropriate pressure to the materials (separator, positive electrode and negative electrode) placed on the stacking stage 600, so as to ensure that each material can be flatly attached together and avoid wrinkles or misalignment.

[0068] The pressure stroke cylinder is connected to the pressure blade and is used to control the vertical movement of the pressure blade, thereby achieving the pressing and releasing action of the material placed on the stacking table 600. By precisely controlling the pressure inside the cylinder, the downward pressing force of the pressure blade can be adjusted to ensure that gaps are not formed between materials due to insufficient pressure, nor that the materials are damaged due to excessive pressure.

[0069] The aforementioned motion motor is a horizontal motion motor for the stacking table. It can be installed below or to the side of the stacking table 600 to control the movement of the stacking table 600 in the horizontal or vertical direction, adapting to the production needs of battery cells of different sizes. It can precisely adjust the position of the stacking table, ensuring that each new layer of material added is accurately placed in the predetermined position.

[0070] In summary, the battery cell stacking device provided by this utility model embodiment drives a smoothing roller mechanism to reciprocate left and right above the stacking table via a connecting rod, which can eliminate redundancy or folding of the diaphragm. The smoothing roller mechanism includes a first smoothing roller and a second smoothing roller with heating function, which are used to allow the diaphragm to pass through the gap between the two smoothing rollers and guide the passed diaphragm to the stacking table for heating and smoothing. This reduces the technical problems of electrode damage caused by diaphragm wrinkles, diaphragm folding and deformation in the prior art, and achieves the technical effects of reducing the defect rate of battery cells and reducing production costs.

[0071] In one embodiment, the entire cell stacking process may include Figure 8 and Figure 9 The two working states are shown.

[0072] Combination Figure 8 As shown, the first working state is as follows: the diaphragm is laid out from right to left for negative electrode stacking. After receiving the instruction, the diaphragm unwinding mechanism 100 is controlled by the first drive motor to rotate the unwinding roller 120 for unwinding; the tension mechanism 200 controls the position of the tension swing arm 230 according to the set tension value to adjust the required tension of the diaphragm. The diaphragm continues to be conveyed downstream to the diaphragm buffer mechanism 800. After receiving the instruction, the buffer movable roller 820 moves horizontally towards the buffer fixed roller 810, conveying the previously buffered diaphragm to the stacking table 600.

[0073] After passing through the gap between the drive roller 900, the film-coating roller mechanism 700, and the smoothing roller mechanism 300, the diaphragm finally reaches the stacking table 600. The connecting rod 400 moves horizontally from right to left, at which time the diaphragm 601 is laid out horizontally from right to left on the stacking table 600. The smoothing roller mechanism 300 also moves accordingly to smooth the diaphragm, eliminating local redundancy and folding deformation of the diaphragm 601 on the stacking table 600.

[0074] The connecting rod 400 continues to move to the left until the smoothing roller mechanism 300 smooths the entire diaphragm 601 on the stacking table 600. At this time, the second smoothing roller 320 moves to the leftmost edge of the stacking table 600, and the position of the second negative electrode transport mechanism 540 is directly opposite the middle of the stacking table 600. The position of the first negative electrode transport mechanism 530 is directly above the negative electrode correction table 640, corresponding to the position of the negative electrode placed on the negative electrode correction table 640. The position of the second positive electrode transport mechanism 520 is directly above the positive electrode transport mechanism 610, corresponding to the position of the positive electrode placed on the positive electrode transport mechanism 610.

[0075] The second negative electrode sheet transport mechanism 540 moves the negative electrode sheet picked up from the negative electrode sheet correction stage 640 to the diaphragm 601 of the stacking stage 600 for stacking via a suction cup. At this time, the suction cup carried by the second negative electrode sheet transport mechanism 540 is stopped to allow the negative electrode sheet to fall onto the diaphragm 601 on the stacking stage 600.

[0076] The first negative electrode transfer mechanism 530 will place the negative electrode picked up from the negative electrode transfer mechanism 630 onto the negative electrode alignment table 640 for alignment and positioning.

[0077] When the first positive electrode transport mechanism 510 is positioned directly above the positive electrode transfer mechanism 610, it is ready to pick up the positive electrode from the positive electrode transfer mechanism 610 so as to move the positive electrode to the positive electrode alignment stage 620; when the second positive electrode transport mechanism 520 is positioned directly above the positive electrode alignment stage 620, it is ready to pick up the positive electrode from the positive electrode alignment stage 620 so as to move the adjusted positive electrode to the stacking stage 600.

[0078] Combination Figure 9 As shown, the second working state is as follows: the diaphragm is laid out from left to right for positive electrode stacking. After receiving the instruction, the diaphragm unwinding mechanism 100 is controlled by the first drive motor to rotate the unwinding roller 120 for unwinding; the tension mechanism 200 controls the position of the tension swing arm 230 according to the set tension value to adjust the required tension of the diaphragm. The diaphragm continues to be conveyed downstream to the diaphragm buffer mechanism 800. After receiving the instruction, the buffer movable roller 820 moves horizontally towards the buffer fixed roller 810, conveying the previously buffered diaphragm to the stacking table 600.

[0079] After passing through the gap between the drive roller 900, the film-coating roller mechanism 700, and the smoothing roller mechanism 300, the diaphragm finally reaches the stacking table 600. The connecting rod 400 moves horizontally from left to right, at which point the entire diaphragm 601 is laid out horizontally from left to right on the stacking table 600. The smoothing roller mechanism 300 also moves accordingly to smooth the diaphragm, eliminating local redundancy and folding deformation of the diaphragm 601 on the stacking table 600.

[0080] The connecting rod 400 continues to move to the right until the smoothing roller mechanism 300 smooths the entire diaphragm 601 on the stacking table 600. At this time, the first smoothing roller 310 moves to the rightmost edge of the stacking table 600, and the position of the second positive electrode transport mechanism 520 is directly opposite the middle of the stacking table 600. The position of the first positive electrode transport mechanism 510 is directly above the positive electrode correction table 620, corresponding to the position of the positive electrode placed on the positive electrode correction table 620. The position of the second negative electrode transport mechanism 540 is directly above the negative electrode transport mechanism 630, corresponding to the position of the negative electrode placed on the negative electrode transport mechanism 630.

[0081] The second positive electrode transport mechanism 520 moves the positive electrode sheet picked up from the positive electrode sheet correction stage 620 to the diaphragm 601 of the stacking stage 600 for stacking via a suction cup. At this time, the suction cup carried by the second positive electrode transport mechanism 520 is stopped to allow the positive electrode sheet to fall onto the diaphragm 601 on the stacking stage 600.

[0082] The first positive electrode transfer mechanism 510 picks up the positive electrode from the positive electrode transfer mechanism 610 and places it on the positive electrode correction stage 620 for correction and positioning.

[0083] When the first negative electrode transfer mechanism 530 is directly above the negative electrode transfer mechanism 630, it is ready to pick up the negative electrode from the negative electrode transfer mechanism 630 so as to move the negative electrode to the negative electrode alignment stage 640; when the second negative electrode transfer mechanism 540 is directly above the negative electrode alignment stage 640, it is ready to pick up the negative electrode from the negative electrode alignment stage 640 so as to move the adjusted negative electrode to the stacking stage 600.

[0084] Based on the same concept, this utility model also provides a cell stacking device, including a motor, a cylinder, and a cell stacking apparatus as described in any of the above optional embodiments, controlled by the motor and the cylinder.

[0085] In summary, the battery cell stacking device and battery cell stacking equipment provided by this utility model embodiment, through the connecting rod 400 driving the smoothing roller mechanism 300 to reciprocate left and right on the diaphragm 601, can eliminate redundancy or folding caused by uneven force on the diaphragm 601; at the same time, the heating function of the smoothing roller mechanism 300 combined with the pressure generated by the reciprocating motion of the smoothing roller mechanism 300 above the diaphragm 601, completes the hot pressing action in each layer inside the battery cell, which can achieve a better hot pressing effect, realize stronger adhesion between the electrode and the diaphragm 601 and electrode core shaping, and can also effectively avoid poor negative polarization interface in subsequent processes.

[0086] In other words, the battery cell stacking device and battery cell stacking equipment provided by this utility model embodiment reduce the technical problems of electrode damage caused by diaphragm wrinkles, diaphragm folding deformation and other issues existing in the prior art, and achieve the technical effects of reducing the defect rate of battery cells and reducing production costs.

[0087] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0088] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0089] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0090] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A cell stacking device, characterized in that, include: The assembly includes a stacking table, a diaphragm unwinding mechanism, a tensioning mechanism, a smoothing roller mechanism, a connecting rod, and an electrode transporting mechanism; wherein the smoothing roller mechanism and the electrode transporting mechanism are both fixedly connected to the connecting rod. The diaphragm unwinding mechanism is located above the stacking table and above the connecting rod, and is used to fix the diaphragm roll. The tension mechanism is disposed above the stacking table and located in the unwinding direction of the diaphragm unwinding mechanism, and is used to adjust the tension of the unwound diaphragm; The smoothing roller mechanism is disposed above the stacking table and below the connecting rod; the smoothing roller mechanism includes a first smoothing roller and a second smoothing roller, the axis of the first smoothing roller and the axis of the second smoothing roller are respectively arranged perpendicular to the movement direction of the connecting rod, and a gap is provided between the first smoothing roller and the second smoothing roller to allow the diaphragm to pass through. The connecting rod is positioned above the stacking table and reciprocates linearly along an axis perpendicular to the diaphragm roll, thereby placing the diaphragm passing through the gap onto the stacking table. Simultaneously, it drives the electrode transport mechanism to move above the stacking table where the diaphragm is placed for stacking.

2. The cell stacking device according to claim 1, characterized in that, The diaphragm unwinding mechanism includes an unwinding roller and a driving component; One end of the unwinding roller is fixedly connected to the output end of the drive unit, and the unwinding roller is fixedly connected to the diaphragm roll.

3. The cell stacking device according to claim 1, characterized in that, The tension mechanism includes: a tension fixing roller and a tension adjusting assembly; the tension fixing roller and the tension adjusting assembly are located on one side of the diaphragm unwinding mechanism; The tension adjustment assembly includes a tension swing arm and a movable tension roller. The tension swing arm includes a moving end and a fixed end. The center of the movable tension roller is located at the moving end of the tension swing arm. The tension swing arm rotates the movable tension roller within a preset angle range with the fixed end as the center and the length of the tension swing arm as the radius.

4. The cell stacking device according to claim 1, characterized in that, Both the first smoothing roller and the second smoothing roller are equipped with a heating mechanism.

5. The cell stacking device according to claim 1, characterized in that, The device also includes a diaphragm buffer mechanism located below the diaphragm unwinding mechanism; The diaphragm buffer mechanism includes N fixed buffer rollers and N-1 movable buffer rollers. A movable buffer roller is arranged between two adjacent fixed buffer rollers. The distance between the movable buffer roller and the two adjacent fixed buffer rollers is adjustable. N is an integer not less than 2.

6. The cell stacking device according to claim 5, characterized in that, The device also includes a film-coating roller mechanism located above the smoothing roller mechanism; The film-coating roller mechanism includes a first film-coating roller and a second film-coating roller. The axis of the first film-coating roller and the axis of the second film-coating roller are respectively arranged perpendicular to the movement direction of the connecting rod. A gap is provided between the first film-coating roller and the second film-coating roller to allow the diaphragm to pass through.

7. The cell stacking device according to claim 6, characterized in that, The device also includes a drive roller disposed between the diaphragm buffer mechanism and the film-coating roller mechanism.

8. The cell stacking device according to claim 1, characterized in that, The electrode transport mechanism includes a positive electrode transport mechanism and a negative electrode transport mechanism; both the positive electrode transport mechanism and the negative electrode transport mechanism are located below the connecting rod. The positive electrode sheet transport mechanism includes: a first positive electrode sheet transport mechanism and a second positive electrode sheet transport mechanism; the first positive electrode sheet transport mechanism and the second positive electrode sheet transport mechanism are disposed on one side of the smoothing roller mechanism, and the second positive electrode sheet transport mechanism is located between the first positive electrode sheet transport mechanism and the smoothing roller mechanism; The negative electrode sheet transport mechanism includes: a first negative electrode sheet transport mechanism and a second negative electrode sheet transport mechanism; the first negative electrode sheet transport mechanism and the second negative electrode sheet transport mechanism are disposed on the other side of the smoothing roller mechanism, and the second negative electrode sheet transport mechanism is located between the smoothing roller mechanism and the first negative electrode sheet transport mechanism; The distance between the smoothing roller mechanism and the second positive electrode transport mechanism is equal to the distance between the smoothing roller mechanism and the second negative electrode transport mechanism.

9. The cell stacking device according to claim 8, characterized in that, The device further includes: a positive electrode plate transmission mechanism, a positive electrode plate correction stage, a negative electrode plate transmission mechanism, and a negative electrode plate correction stage; the positive electrode plate transmission mechanism, the positive electrode plate correction stage, the negative electrode plate transmission mechanism, the negative electrode plate correction stage, and the stacking stage are all arranged on the same horizontal line; The positive electrode transfer mechanism and the positive electrode correction stage are disposed on one side of the stacking stage; the positive electrode correction stage is located between the positive electrode transfer mechanism and the stacking stage; The distance between the positive electrode transfer mechanism and the positive electrode correction stage is equal to the distance between the first positive electrode transport mechanism and the second positive electrode transport mechanism; The negative electrode sheet transmission mechanism and the negative electrode sheet correction stage are disposed on the other side of the stacking stage; the negative electrode sheet correction stage is located between the negative electrode sheet transmission mechanism and the stacking stage; The distance between the negative electrode transfer mechanism and the negative electrode correction stage is equal to the distance between the first negative electrode transport mechanism and the second negative electrode transport mechanism.

10. A cell stacking device, characterized in that, It includes a motor, a cylinder, and a cell stacking device as described in any one of claims 1-9, which is controlled by the motor and the cylinder.

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