Laminating device

Abstract

Laminating device, characterized in that it comprises a laminating table, a pressure plate and a drive, wherein the laminating table is used for placing electrode plates, each having a material section and a connecting tab, wherein the electrode plates stacked on top of each other on the laminating table comprise a first electrode plate whose connecting tab has a first end cap, wherein the printing plate has a smoothing section that protrudes from the surface of the printing plate, wherein the drive is connected to the pressure plate to drive the pressure plate such that the pressure plate is pulled out from under the electrode plate in a direction away from the laminating table and is pressed against a top side of the electrode plate, wherein the orthogonal projection of the pressure plate onto the plane in which the laminating table is located overlaps the orthogonal projection of the first end corner onto the plane in which the laminating table is located when the pressure plate is pressed against the top side of the electrode plate, wherein a motion trajectory of the orthogonal projection of the smoothing section onto the plane in which the laminating table is located overlaps the orthogonal projection of the first end corner onto the plane in which the laminating table is located, and wherein the smoothing section is used to smooth the first end corner when the first end corner is folded towards the side on which the smoothing section is located.

Description

Technical field

[0001] The present invention relates to the technical field of batteries, in particular a laminating device. Technical background

[0002] In the production of a lithium-ion battery cell, positive and negative electrode plates are laminated alternately to form a cell semi-finished product. Each positive and negative electrode plate comprises a current collector and an active substance coated on the collector's surface. The portion of the current collector not coated with the active substance forms a terminal. A copper foil is typically used as the current collector for a negative electrode plate. Because copper foil is relatively soft, the terminal of the negative electrode plate's terminal is prone to wrinkling at one end. Therefore, when laminating this negative electrode plate into a cell, the terminal of the negative electrode plate at the end is susceptible to kinking.This then leads to a large proportion of the produced cells exhibiting abnormal self-discharge, thus impairing the cell qualification rate. Content of the invention

[0003] The invention provides a lamination device to eliminate the problems of slight kinking of the connecting tab of the negative electrode plate at one end corner and the large proportion of manufactured cells with abnormal self-discharge in the prior art.

[0004] According to the invention, a laminating device is proposed which comprises a laminating table, a pressure plate and a drive, wherein the laminating table is used for placing electrode plates, each having a material section and a connecting tab, wherein the electrode plates stacked on top of each other on the laminating table comprise a first electrode plate whose connecting tab has a first end cap, wherein the printing plate has a smoothing section that protrudes from the surface of the printing plate, wherein the drive is connected to the pressure plate to drive the pressure plate such that the pressure plate is pulled out from under the electrode plate in a direction away from the laminating table and is pressed against a top side of the electrode plate, wherein the orthogonal projection of the pressure plate onto the plane in which the laminating table is located overlaps the orthogonal projection of the first end corner onto the plane in which the laminating table is located when the pressure plate is pressed against the top side of the electrode plate, wherein a motion trajectory of the orthogonal projection of the smoothing section onto the plane in which the laminating table is located overlaps the orthogonal projection of the first end corner onto the plane in which the laminating table is located, and wherein the smoothing section is used to smooth the first end corner when the first end corner is folded towards the side on which the smoothing section is located.

[0005] The laminating device according to the invention has at least the following beneficial effects:

[0006] In the laminating device described above, the pressure plate has a smoothing section that protrudes from its surface, resulting in an uneven surface. As the pressure plate is withdrawn, the smoothing section moves with it. Upon contact with the first end of the terminal tab, the smoothing section gently pulls the first end upward, causing it to extend and unfold outwards under the pressure of the smoothing section. This reduces the bending of the terminal tab during lamination, lowers the risk of abnormal self-discharge in the manufactured cell, and increases the cell qualification ratio. Images Fig. Figure 1 is a schematic view of a laminating device according to an embodiment of the invention; Fig. Figure 2 is a schematic view of a laminate according to an embodiment of the invention; Fig. Figure 3 is a schematic view of the smoothing of a first end surface by a pressure plate according to an embodiment of the invention; Fig. Figure 4 is a schematic view of a positional relationship between the orthogonal projection of the printing plate onto the surface of a laminating table and the orthogonal projection of the electrode plate onto the surface of the laminating table according to an embodiment of the invention; Fig. Figure 5 is a schematic view of a further positional relationship between the orthogonal projection of the printing plate onto the surface of a laminating table and the orthogonal projection of the electrode plate onto the surface of the laminating table according to an embodiment of the invention; Fig. Figure 6 is a schematic view of a printing plate according to an embodiment of the invention; Fig. 7 is a schematic view of a cross-section of the first surface oriented perpendicular to a first direction Y according to an embodiment of the invention; and Fig. Figure 8 is another schematic view of the structure of the printing plate according to an embodiment of the invention. Reference symbol list: 10 Laminating table; 20 electrode plates; 201 Material section; 202 Connecting tab; 203 first discovery; 204 first edge; 21 first electrode plate; 22 Electrode plate a; 23 Electrode plate b; 24 Electrode plate c; 30 printing plates; 31 first printing plate; 32 second printing plate; 301 first end; 302 second end; 303 first edge; 304 second edge; 40 smoothing section; 401 first surface; 402 third end; 403 fourth end; 50 drive. Description of embodiments

[0007] The invention is described in more detail below with reference to the drawings in order to clarify the objectives, technical solutions, and advantages of the invention. Naturally, the described embodiments represent not all, but only a portion of the embodiments according to the invention. Based on the embodiment presented in the present invention, the other embodiments that a person skilled in the art could obtain without inventive step are intended to fall within the scope of protection of the present invention.

[0008] Fig. Figure 1 is a schematic view of a laminating device according to an embodiment of the invention. As shown in Fig. As shown in Figure 1, in one embodiment the laminating device comprises a laminating table 10. The laminating table 10 is used for placing electrode plates 20. The electrode plates 20 comprise positive electrode plates and negative electrode plates, which are placed alternately on the laminating table 10 during lamination. The electrode plate 20 has a material section 201 and a connecting tab 202. The material section 201 comprises a current collector and an active substance coated on its surface. The connecting tab 202 comprises only the current collector.When the positive and negative electrode plates are stacked on the laminating table 10, the orthogonal projection of the material section 201 of the positive electrode plate onto the plane in which the laminating table 10 is located overlaps with the orthogonal projection of the material section 201 of the negative electrode plate onto the plane in which the laminating table 10 is located. The orthogonal projection of the connecting tab 202 of the positive electrode plate onto the plane in which the laminating table 10 is located and the orthogonal projection of the connecting tab 202 of the negative electrode plate onto the plane in which the laminating table 10 is located are positioned at opposite ends of the overlap area.

[0009] With further reference to Fig. The laminating device further comprises a pressure plate 30 and a drive 50. The pressure plate 30 is used to compress the electrode plates 20, which are transferred to the laminating table 10, in order to reduce misalignment of the electrode plates 20 during lamination and to increase their degree of alignment. The pressure plate 30 is connected to the drive 50, and the drive 50 allows the pressure plate 30 to be pulled out from under the electrode plate 20, away from the laminating table 10, and pressed against the top surface of the electrode plate 20. The electrode plates 20 mentioned above are the positive and negative electrode plates, which are present in the lamination sequence.In one embodiment, the laminating device comprises four pressure plates 30, two of which are positioned together with the connecting tab 202 of the positive electrode plates at one end, and the other two pressure plates 30 together with the connecting tab 202 of the negative electrode plates at the other end. During lamination, the actions mentioned above are performed alternately by both the two pressure plates 30 located at the same end as the connecting tab 202 of the positive electrode plates and the two pressure plates 30 located at the same end as the connecting tab 202 of the negative electrode plates.

[0010] To clearly describe the actions of the printing plate 30 during lamination, two printing plates 30 on the same end are now taken as an example. Fig. Figure 2 is a schematic view of a laminate according to an embodiment of the invention. As shown in Fig. As shown in Figure 2, the two pressure plates 30 are a first pressure plate 31 and a second pressure plate 32. At a first time point, an electrode plate a22 is positioned on the laminating table 10. The first pressure plate 31 is located below the electrode plate a22, and the second pressure plate 32 is located above the electrode plate a22. At a second time point, a newly positioned electrode plate b23 is placed on the laminating table 10. The electrode plate b23 has a polarity opposite to the polarity of the electrode plate a22. Then, the second pressure plate 32 remains stationary, and the first pressure plate 31 is withdrawn and pressed against the surface of the electrode plate b23. At a third time point, a newly positioned electrode plate c24 is placed on the laminating table 10. The electrode plate c24 has a polarity opposite to the polarity of the electrode plate b23.The first pressure plate 31 then remains stationary, and the second pressure plate 32 is withdrawn and pressed against the surface of the electrode plate c24. During lamination, the first pressure plate 31 and the second pressure plate 32 alternately perform the actions described above.

[0011] With reference to Fig. 1 and Fig. The electrode plates 20 stacked on top of each other on the laminating table 10 comprise a first electrode plate 21. The connecting tab 202 of the first electrode plate 21 has a first end cap 203. The first electrode plate 21 can be either a positive or a negative electrode plate. Before the pressure plate 30 is withdrawn, the first electrode plate 21 and the pressure plate 30 are in contact. During lamination, the first electrode plate 21 can be located either above or below the pressure plate 30. The orthogonal projection of the pressure plate 30 onto the plane in which the laminating table 10 is located overlaps the orthogonal projection of the first end cap 203 onto the plane in which the laminating table 10 is located when the pressure plate 30 is pressed against the top of the electrode plate 21.

[0012] The pressure plate 30 has a smoothing section 40, and the smoothing section 40 projects from the surface of the pressure plate 30. The first electrode plate 21 and the smoothing section 40 are located on the same side of the pressure plate 30. The orthogonal projection of the smoothing section 40 onto the plane in which the laminating table 10 is located and the orthogonal projection of the connecting tab 202 of the first electrode plate 21 onto the plane in which the laminating table 10 is located overlap at least partially when the pressure plate 30 is pressed against the top of the electrode plate 20. During the withdrawal of the printing plate 30, a movement trajectory of the orthogonal projection of the smoothing section 40 onto the plane in which the laminating table 10 is located can overlap the orthogonal projection of the first end blanket 203 onto the plane in which the laminating table 10 is located.Therefore, the smoothing section 40 can be drawn across the first blanket 203. If the first blanket 203 is folded towards the side on which the smoothing section 40 is located, the smoothing section 40, as it moves, can cause the first blanket 203 to spread out and thus unfold, in order to smooth the first blanket 203.

[0013] Fig. Figure 3 is a schematic view of the smoothing of a first end surface by a pressure plate according to an embodiment of the invention. As in Fig. Figure 3 shows the direction for withdrawing the pressure plate 30, indicated by an arrow. During withdrawal of the pressure plate 30 in this direction, the smoothing section 40 moves along with the pressure plate 30 and is pulled across the surface of the connecting tab 202. Upon contact between the smoothing section 40 and the first end flap 203 of the connecting tab 202, the smoothing section 40 gently pulls the first end flap 203 upwards, causing it to extend and unfold outwards under the pressure of the smoothing section 40. This reduces the kink in the first end flap 203 during lamination, decreases the risk of abnormal self-discharge of the cell, and increases the cell qualification ratio.

[0014] To reduce the risk of the active substance detaching from material section 201 due to scratching of material section 201 of the first electrode plate 21 by the smoothing section 40 when the pressure plate 30 is withdrawn, in one embodiment the smoothing section 40 is located on a side of the boundary between material section 201 and the connecting tab 202 of the first electrode plate 21 that is further away from material section 201 of the first electrode plate 21 when the pressure plate 30 is pressed against the top of the electrode plate 21. Thus, the orthogonal projection of the smoothing section 40 onto the plane in which the laminating table 10 is located and the orthogonal projection of material section 201 onto the plane in which the laminating table 10 is located do not overlap with respect to the first electrode plate 21.Thus, the smoothing section 40 does not touch the material section 201 when the printing plate 30 is pulled out, thereby reducing the risk of the material section 201 being scratched by the smoothing section 40.

[0015] In the specific design of the pressure plate 30, it must be taken into account that the pressure plate 30 should have high strength so that it is not easily deformed and can exert high pressure on the electrode plate 20. The pressure plate 30 can be made of either a metallic or a non-metallic material. This is not specifically limited in the application. There are many possibilities for the shape of the pressure plate 30. For example, the pressure plate 30 can be rectangular, circular, oval, or irregular.

[0016] Fig. Figure 4 is a schematic view of a positional relationship between the orthogonal projection of the printing plate onto the surface of a laminating table and the orthogonal projection of the electrode plate onto the surface of the laminating table according to an embodiment of the invention. Fig. Figure 5 is a schematic view of a further positional relationship between the orthogonal projection of the printing plate onto the surface of a laminating table and the orthogonal projection of the electrode plate onto the surface of the laminating table according to an embodiment of the invention. As in Fig. 4 and Fig. As shown in Figure 5, in some embodiments the pressure plate 30 has a first end 301 and a second end 302, which are opposite each other. The first end 301 is used for the connection to the drive 50. Before the pressure plate 30 is withdrawn, the orthogonal projection of the first end 301 onto the plane in which the laminating table 10 is located is outside the orthogonal projection of the electrode plate 20 onto the surface of the laminating table 10, and the orthogonal projection of the second end 302 onto the plane in which the laminating table 10 is located and the orthogonal projection of the electrode plate 20 onto the surface of the laminating table 10 overlap at least partially.

[0017] For any given electrode plate 20, the orthogonal projection of the second end 302 onto the surface of the laminating table 10 and the orthogonal projection of the material section 201 of the electrode plate 20 onto the surface of the laminating table 10 optionally overlap at least partially. During lamination, the pressure plate 30 presses the material section 201 and the connecting tab 202 of the negative electrode plate firmly when the pressure plate 30 is pressed against the surface of the negative electrode plate. The pressure plate 30 presses the material section 201 of the negative electrode plate firmly when the pressure plate 30 is pressed against the surface of the positive electrode plate. That is, the pressure plate 30 can press the electrode plate firmly regardless of whether the electrode plate is positive or negative.

[0018] With further reference to Fig. In Figure 4, the pressure plate 30 has a first edge 303 in addition to the first end 301 and the second end 302. The first edge 303 is located between the first end 301 and the second end 302. Before the pressure plate 30 is withdrawn, the orthogonal projection of the first edge 303 onto the plane in which the laminating table 10 is located intersects with the orthogonal projection of the electrode plate 20 onto the plane in which the laminating table 10 is located, or the orthogonal projection of the first edge 303 onto the plane in which the laminating table 10 is located is located outside the orthogonal projection of the electrode plate 20 onto the plane in which the laminating table 10 is located.

[0019] In particular, the electrode plate 20 has a first edge 204. Part of the first edge 204 lies in the material section 201 and another part lies in the connecting tab 202. When the pressure plate 30 presses the electrode plate 20 firmly, many positional relationships can exist between the first edge 303 and the first edge 204. For example, in Fig. As shown in Figure 4, in one embodiment the orthogonal projection of the first edge 303 onto the plane in which the laminating table 10 is located overlaps with the orthogonal projection of the first border 204 onto the plane in which the laminating table 10 is located. The orthogonal projection of the first edge 303 onto the plane in which the laminating table 10 is located and the orthogonal projection of the electrode plate 20 onto the plane in which the laminating table 10 is located intersect.

[0020] As in Fig. As shown in Figure 5, in another embodiment the orthogonal projection of the first edge 303 onto the plane in which the laminating table 10 is located lies outside the orthogonal projection of the first border 204 onto the plane in which the laminating table 10 is located. The orthogonal projection of the first edge 303 onto the plane in which the laminating table 10 is located and the orthogonal projection of the electrode plate 20 onto the plane in which the laminating table 10 is located do not intersect.

[0021] For the electrode plate 20, in which the connecting tab 202 and the pressure plate 30 are arranged on the same end of the laminating table 10, in the embodiment described above, the orthogonal projection of the pressure plate 30 onto the plane in which the laminating table 10 is located can completely cover one end of the connecting tab 202 of this electrode plate 20.

[0022] In yet another embodiment, the orthogonal projection of the first edge 303 onto the plane in which the laminating table 10 is located lies within the orthogonal projection of the first border 204 onto the plane in which the laminating table 10 is located. In this case, the orthogonal projection of the first edge 303 onto the plane in which the laminating table 10 is located and the orthogonal projection of the electrode plate 20 onto the plane in which the laminating table 10 is located intersect.

[0023] If, in particular, the smoothing section 40 is provided, the smoothing section 40 can be formed in many structural shapes. Fig. Figure 6 is a schematic view of a printing plate according to an embodiment of the invention. As in Fig. As shown in Figure 6, in one embodiment the smoothing section 40 is designed as a strip. The smoothing section 40 extends in a first direction Y, and the dimension of the smoothing section 40 in the first direction Y is significantly larger than the dimension of the smoothing section 40 in the direction perpendicular to direction Y.

[0024] In another embodiment, the smoothing section 40 comprises a projection. Optionally, the projection can be cylindrical, hemispherical, semi-elliptical, or irregular. One, two, three, or more projections can be provided, the number of which can be adjusted according to practical application requirements and is not specifically limited in the application. In a specific embodiment, the smoothing section 40 comprises several projections. Regarding the specific arrangement of the multiple projections, they can be arranged either in a single row in a particular direction or in several rows, and the adjacent rows can be either aligned with one another or offset from one another.

[0025] Of course, the smoothing section 40 can also be formed in other ways that are not individually listed in the application.

[0026] To reduce damage to the first electrode plate 21 caused by the smoothing section 40 during the withdrawal of the pressure plate 30, in one embodiment the smoothing section 40 has a first surface 401 as shown in Fig. Figure 6 shows the first surface 401, which projects away from the pressure plate 30 and is curved. Before the pressure plate 30 is withdrawn, the first surface 401 faces the first electrode plate 21 and is in contact with it. During withdrawal of the pressure plate 30, damage to the first electrode plate 21 is reduced by the smoothing section 40, as the first surface 401 is smooth and without edges.

[0027] With further reference to Fig. In one embodiment, the first surface 401 extends in the first direction Y. The first surface 401 is arc-shaped. The first surface 401 has two lateral edges that extend in the first direction Y and are connected to the printing plate 30. A portion between the two edges projects away from the printing plate 30. A cross-section of the first surface 401 oriented perpendicular to the first direction Y can be formed in various shapes, such as a circular arc, an elliptical arc, or an irregular arc.

[0028] Fig. Figure 7 is a schematic view of a cross-section of the first surface oriented perpendicular to a first direction according to an embodiment of the invention. As in Fig. As shown in Figure 7, a cross-section of the first surface 401, oriented perpendicular to a first direction Y, represents an elliptical arc. The eccentricity of the elliptical arc is denoted as e, where 0 < e < 1. The corresponding longer axis of the elliptical arc lies on the Z-axis, and the corresponding shorter axis lies on the X-axis. The smaller the value of e, the more the elliptical arc approximates a circular arc and the more difficult it is to smooth the connecting tab. The larger the value of e, the flatter the elliptical arc, the sharper the end of the elliptical arc furthest from the printing plate 30, and the easier it is to scratch and damage the connecting tab. It should be noted that the X-axis is parallel to the surface of the printing plate 30 and perpendicular to the first direction Y, and that the Z-axis is perpendicular to the surface of the printing plate 30.

[0029] In a specific embodiment, e satisfies the following condition: 0.5 ≤ e ≤ 0.8. Optionally, e may have a value of 0.55, 0.6, 0.65, 0.7, 0.75, or any other value that satisfies the aforementioned condition, which is not individually listed in the application. In the area mentioned above, the first surface 401 has a suitable shape such that the smoothing section 40 exhibits a good smoothing effect and damage to the connecting tab caused by scratching of the smoothing section 40 is reduced.

[0030] For the smoothing section 40 with a strip-shaped structure, the smoothing section 40 can be arranged in a variety of ways with respect to the first edge 303 of the printing plate 30, depending on the specific arrangement of the smoothing section 40. As in Fig. As shown in Figure 6, in one embodiment the smoothing section 40 is arranged obliquely relative to the first edge 303. During the withdrawal of the printing plate 30, the smoothing section 40 moves parallel and obliquely relative to the first edge 303, and it is pulled across the surface of the connecting tab 202.

[0031] Fig. Figure 8 is another schematic view of the structure of the printing plate according to an embodiment of the invention. As in Fig. As shown in Figure 8, in another embodiment the smoothing section 40 is arranged perpendicular to the first edge 303. During the withdrawal of the printing plate 30, the smoothing section 40 moves parallel and perpendicular to the first edge 303, and it is pulled across the surface of the connecting tab 202.

[0032] To reduce damage to the first edge 203 caused by the smoothing section 40 during the smoothing of the first edge 203, in one embodiment the smoothing section 40 is arranged obliquely relative to the first edge 303, as shown in Fig. Figure 6 shows that the distance between the smoothing section 40 and the first edge 303 gradually decreases in the direction from the first end 301 to the second end 302. The oblique direction of the smoothing section 40 is approximately equal to the oblique direction of the fold when the first end flap 203 is creased. As the smoothing section 40 is drawn along the first end flap 203, it may touch the surface of the first end flap 203, causing the first end flap 203 to be pushed outwards, thereby reducing the risk of damage from tearing of the edge of the first end flap 203.

[0033] The angle between the direction of extension (the first direction Y) of the smoothing section 40 and the first edge 303 is denoted as θ. The larger the value of θ, the larger the area traversed by the smoothing section 40. The smaller the value of θ, the smaller the area traversed by the smoothing section 40. In one embodiment, θ satisfies the following condition: 50° ≤ θ ≤ 60°. Thus, the area traversed by the smoothing section 40 is relatively large, and the direction of extension of the smoothing section 40 is similar to the oblique direction of the fold when the first end corner 203 is folded. Optionally, θ can have a value of 51°, 52°, 53°, 54°, 55°, 56°, 57°, 58°, 59°, or any other value that satisfies the aforementioned condition and is not individually listed in the application.

[0034] With respect to the first edge 303 of the printing plate 30, there is a shortest distance between the smoothing section 40 and the first edge 303. To simplify the description, the two ends of the smoothing section 40 are referred to longitudinally as a third end 402 and a fourth end 403. The third end 402 is located near the first end 301 of the printing plate 30, and the fourth end 403 is further away from the first end 301 of the printing plate 30. From the third end 402 to the fourth end 403, the distance between the smoothing section 40 and the first edge 303 gradually decreases. At the fourth end 403, there is a shortest distance between the smoothing section 40 and the first edge 303. This shortest distance is denoted as d1.If d1 is too large, the distance between the fourth end 403 of the smoothing section 40 and the first edge 303 is too great, so that the movement trajectory of the smoothing section 40 would not pass through the first end 203 of the connecting flap 202, and thus the first end 203 would not be smoothed. If d1 is too small, the distance between the smoothing section 40 and the first edge 303 is too small, so that an impact could easily occur at the fourth end 403 of the smoothing section 40, which could create a sharp corner that could very easily break the connecting flap 202 during lamination and again impair the quality of the cell.

[0035] To eliminate the aforementioned problem, in one embodiment, d1 satisfies the following condition: 5 mm ≤ d1 ≤ 8 mm. Optionally, d1 can have a value of 5.5 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm, or any other value that satisfies the aforementioned condition, which is not individually listed in the application. With a value of d1 in the aforementioned range, the probability that the smoothing section 40 passes through the first end corner 203 of the connecting tab 202 can be increased, and the risk of impact of the fourth end 403 of the smoothing section 40 can also be reduced.

[0036] The printing plate 30 has, in addition to the first edge 303, a second edge 304. The second edge 304 is located at the second end 302. With respect to the second edge 304, there is also a shortest distance between the smoothing section 40 and the second edge 304, which is also located at the fourth end 403. The shortest distance between the smoothing section 40 and the second edge 304 is designated d2. If d2 is too large a value, the distance of the fourth end 403 of the smoothing section 40 to the second edge 304 is too large, so that the motion trajectory of the orthogonal projection of the smoothing section 40 onto the plane in which the laminating table 10 is located cannot completely cover the orthogonal projection of the first end corner 203 onto the plane in which the laminating table 10 is located, which impairs the smoothing effect of the first end corner 203 by the smoothing section 40.If d2 is too small, the distance between the fourth end 403 of the smoothing section 40 and the second edge 304 is too small. This means that before the printing plate 30 is withdrawn, the orthogonal projection of the smoothing section 40 onto the plane in which the laminating table 10 is located may be positioned within the orthogonal projection of the material section 201 onto the plane in which the laminating table 10 is located. This results in the smoothing section 40 being dragged across the surface of the material section 201 during the withdrawal of the printing plate 30, and in turn, a higher risk of damage to the material section 201 from scratching by the smoothing section 40.

[0037] To eliminate the aforementioned problem, in one embodiment, d2 satisfies the following condition: 20 mm ≤ d2 ≤ 30 mm. Optionally, d2 can have a value of 22 mm, 24 mm, 26 mm, 28 mm, or any other value that satisfies the aforementioned condition, which is not individually listed in the application. In the area mentioned above, a suitable distance is created between the smoothing section 40 and the second edge 304, so that before the printing plate 30 is withdrawn, a flat area of ​​the printing plate 30, without a smoothing section 40, may contact the material section 201, while the smoothing section 40 avoids the material section 201 and can only contact the connecting tab 202. Thus, during the withdrawal of the printing plate 30, the risk of damage to the material section 201 by scratching from the smoothing section 40 is reduced.The motion trajectory of the orthogonal projection of the smoothing section 40 onto the plane in which the laminating table 10 is located can completely cover the orthogonal projection of the first blanket 203 onto the plane in which the laminating table 10 is located, thus improving the smoothing effect of the first blanket 203 by the smoothing section 40.

[0038] When specifically adjusting the length of the smoothing section 40, it should be taken into account that an excessively long smoothing section 40 slightly affects the stress distribution of the printing plate 30, making the printing plate 30 susceptible to failure at a location corresponding to the smoothing section 40. If the smoothing section 40 is too short, the trajectory of the orthogonal projection of the smoothing section 40 onto the plane in which the laminating table 10 is located may not completely overlap the orthogonal projection of the first end cap 203 onto the plane in which the laminating table 10 is located, thus impairing the smoothing effect. To eliminate the aforementioned problem, L1 and L2 satisfy the following condition, where L1 represents the length of the smoothing section 40 and L2 represents the length of the connecting tab 202 in the extension direction of the first edge 204: L2 - 2 mm ≤ L1 ≤ L2 + 2 mm.In one specific embodiment, L2 has a value of 10 mm, so that 8 mm ≤ L1 ≤ 12 mm. Optionally, L1 can have a value of 9 mm, 10 mm, 11 mm, or any other value that satisfies the aforementioned condition. Of course, L2 can also have other values ​​not individually listed in the application.

[0039] When specifically adjusting the height by which the smoothing section 40 projects from the surface of the printing plate 30, it should be taken into account that a large projection height can hinder lamination. With a large projection height, it is difficult to smooth the connecting tab. In one embodiment, h1 and h2 satisfy the following condition, where h1 is the height by which the smoothing section 40 projects from the surface of the printing plate 30, and h2 is the thickness of the printing plate 30: h2 - 2 mm ≤ h1 ≤ h2 + 2 mm. In a specific embodiment, h2 has a value of 3 mm, so that 1 mm ≤ h1 ≤ 5 mm. Optionally, h2 can have a value of 1.5 mm, 2 mm, 2.5 mm, 3 mm or any other value that satisfies the aforementioned condition.Of course, h2 can also have other values ​​that are not individually listed in the application.

[0040] In another embodiment, h1 and h2 satisfy the following conditions: 0 < h1 ≤ 0.5 h2 and h2 < h1 + h2 ≤ 1.5 h2. Thus, the total height of the printing plate 30 and the smoothing section 40 should not exceed 1.5 times the thickness of the printing plate 30. In a specific embodiment, h2 has a value of 3 mm, so that 0 mm ≤ h1 ≤ 1.5 mm and 3 mm < h1 + h2 ≤ 4.5 mm. Optionally, h2 can have a value of 0.5 mm, 0.8 mm, 1.0 mm, 1.2 mm, 1.5 mm, or any other value that satisfies the aforementioned condition. Naturally, h2 can also have other values ​​not specifically listed in the application.

[0041] With respect to the laminating table 10, the smoothing section 40 can be located either on a surface of the pressure plate 30 facing away from the laminating table 10 or on a surface of the pressure plate 30 facing the laminating table 10. Alternatively, in one embodiment, the two surfaces of the pressure plate 30 facing away from each other in the thickness direction are each provided with a smoothing section 40. Thus, during the withdrawal of the pressure plate 30, the smoothing section 40 can smooth the connecting tab 202 of the first electrode plate 21, which is located on the same side as the smoothing section and adjacent to it.

[0042] In the practical connection between the smoothing section 40 and the printing plate 30, the smoothing section 40 can be glued to a surface of the printing plate 30, or the smoothing section 40 can be welded to the surface of the printing plate 30, or the smoothing section 40 can be formed in one piece with the printing plate 30.

[0043] In one practical configuration, the drive 50 comprises a screw. The screw includes components such as a nut, a shank, and the like. The nut is connected to the pressure plate 30. The screw exhibits high force transmission accuracy, allowing precise control of the pressure plate 30's position. In other embodiments, the drive 50 can also include a hydraulic or pneumatic cylinder for hydraulic or pneumatic force transmission.

[0044] In addition, the laminating device includes a release film unwinding device, a feeder for the positive electrode plates, and a feeder for the negative electrode plates. The release film unwinding device is used to unwind the release film, which is moved back and forth in a left-right direction during lamination, creating a fold in the form of a zigzag line. The feeder for the positive electrode plates and the feeder for the negative electrode plates are used to alternately place the positive and negative electrode plates onto the release film.

[0045] It should be obvious to those skilled in the art that they can make various modifications and changes to the invention without departing from the spirit and scope of the application. Such modifications and changes to the invention still fall within the scope of the claims of the invention and their equivalents and are intended to be included in the present invention.

[0046] The present invention relates to the technical field of batteries and discloses in particular a laminating device. The laminating device comprises a laminating table, a pressure plate, and a drive. The laminating table is used for placing electrode plates, and the electrode plates stacked one above the other on the laminating table comprise a first electrode plate whose connecting tab has a first end cap. The pressure plate has a smoothing section that projects from the surface of the pressure plate. The drive is connected to the pressure plate to drive the pressure plate so that the pressure plate is pulled out from under the electrode plate in a direction away from the laminating table and pressed against a top surface of the electrode plate.The orthogonal projection of the pressure plate onto the plane in which the laminating table is located overlaps the orthogonal projection of the first end flap onto the plane in which the laminating table is located when the pressure plate is pressed against the top of the electrode plate. A motion trajectory of the orthogonal projection of the smoothing section onto the plane in which the laminating table is located overlaps the orthogonal projection of the first end flap onto the plane in which the laminating table is located. As the smoothing section moves, it can force the first end flap to spread out and thus unfold, thereby mitigating the kink in the connecting flap if the first end flap is folded toward the side on which the smoothing section is located.

Claims

[1] Laminating device, characterized by that it includes a laminating table, a printing plate and a drive, wherein the laminating table is used for placing electrode plates, each having a material section and a connecting tab, wherein the electrode plates stacked on top of each other on the laminating table comprise a first electrode plate whose connecting tab has a first end cap, wherein the printing plate has a smoothing section that protrudes from the surface of the printing plate, wherein the drive is connected to the pressure plate to drive the pressure plate such that the pressure plate is pulled out from under the electrode plate in a direction away from the laminating table and is pressed against a top side of the electrode plate, wherein the orthogonal projection of the pressure plate onto the plane in which the laminating table is located overlaps the orthogonal projection of the first end corner onto the plane in which the laminating table is located when the pressure plate is pressed against the top side of the electrode plate, wherein a motion trajectory of the orthogonal projection of the smoothing section onto the plane in which the laminating table is located overlaps the orthogonal projection of the first end corner onto the plane in which the laminating table is located, and wherein the smoothing section is used to smooth the first end corner when the first end corner is folded towards the side on which the smoothing section is located. [2] Laminating device according to claim 1, characterized by , that the smoothing section has a first surface that protrudes in the direction away from the printing plate and represents a curved surface. [3] Laminating device according to claim 2, characterized by , that the first surface extends in a first direction and a cross-section of the first surface oriented perpendicular to the first direction represents an elliptical arc with an eccentricity of e, where e satisfies the following condition: 0.5 ≤ e ≤ 0.

8. [4] Laminating device according to claim 1, characterized by that the smoothing section is formed in a strip-like shape. [5] Laminating device according to claim 4, characterized by , that the printing plate has a first end and a second end opposite each other, and a first edge between the first end and the second end, the first end being connected to the drive, wherein the orthogonal projection of the first edge onto the plane in which the laminating table is located and the orthogonal projection of the first electrode plate onto the plane in which the laminating table is located intersect when the pressure plate is pressed against the top of the electrode plate, or wherein the orthogonal projection of the first edge onto the plane in which the laminating table is located is positioned outside the orthogonal projection of the first electrode plate onto the plane in which the laminating table is located, and wherein the smoothing section is arranged obliquely and has a gradually decreasing distance to the first edge in the direction from the first end to the second end. [6] Laminating device according to claim 5, characterized by, that the angle between the extension direction of the smoothing section and the extension direction of the first edge is called θ, where θ satisfies the following condition: 50° ≤ θ ≤ 60°. [7] Laminating device according to claim 5, characterized by , that the shortest distance of the smoothing section to the first edge is called d1, where d1 satisfies the following condition: 5 mm ≤ d1 ≤ 8 mm. [8] Laminating device according to claim 5, characterized by , that the printing plate furthermore has a second edge located at the second end, wherein the shortest distance of the smoothing section to the second edge is called d2, where d2 satisfies the following condition: 20 mm ≤ d2 ≤ 30 mm. [9] Laminating device according to any one of claims 1 to 8, characterized by, that the smoothing section is located on a side of the boundary between the material section and the connecting tab of the first electrode plate that is further away from the material section of the first electrode plate when the pressure plate is pressed against the top of the electrode plate, [10] Laminating device according to any one of claims 1 to 8, characterized by , that the maximum height by which the smoothing section protrudes from the surface of the printing plate is called h1 and the thickness of the printing plate is called h2, where h1 and h2 satisfy the following condition: |h1 - h2| ≤ 2 mm.

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