Pole piece embossing roller pressing device and pole piece embossing roller pressing method

Abstract

The present invention relates to a pole piece embossing rolling device and a pole piece embossing rolling method, wherein the embossing rolling device comprises a hot pre-pressing module, a pole lug embossing module, a pole piece front embossing module and a rolling module which are sequentially arranged along the pole piece belt direction; the hot pre-pressing module is used to perform hot pre-rolling treatment on the pole piece to reduce the thickness of the pole piece; the pole lug embossing module comprises a roller, on which a first embossing portion is arranged, and the first embossing portion is used to form embossing in the pole lug area of ​​the pole piece; the pole piece front embossing module comprises a roller, on which a second embossing portion is arranged, and the second embossing portion is used to form embossing in the coating area of ​​the pole piece; the rolling module is used to perform rolling treatment on the coating area and the pole lug area of ​​the pole piece. The present invention performs separate embossing extension on the pole lug area in view of the thickness difference between the coating area and the pole lug area, which effectively alleviates the wrinkle problem and belt breakage problem caused by the inconsistent extension of the pole piece.

Description

Technical Field

[0001] The invention mainly relates to the field of batteries, and in particular to a pole piece embossing roller pressing device and a pole piece embossing roller pressing method. Background Art

[0002] As the breadth and depth of lithium battery applications continue to increase, the requirements for lithium batteries are also getting higher and higher. Under the premise of ensuring good safety, cycle life and rate performance, the demand for continuously developing lithium batteries with high energy density and low production costs is becoming more and more urgent. In order to meet the needs of the power and energy storage lithium battery market, major lithium battery manufacturers are competing to optimize processes and carry out technical transformation of equipment to improve production efficiency, reduce costs and improve product quality.

[0003] Patent CN213988929U discloses an embossing roller pressing device and a battery manufacturing system, which alleviates or eliminates the extension problem of the pole piece and reduces the occurrence of the broken belt problem by sequentially setting a preheating module, a pre-rolling module, an embossing module and a rolling module. The embossing module is used to emboss the pole piece after the pre-rolling treatment. However, the embossing module in this scheme cannot perform embossing and extension on the pole ear area due to the thickness difference between the pole piece coating area and the pole ear area, resulting in limited improvement effect on the extension and broken belt problems of the pole piece; in addition, the embossing modules are all arranged before the rolling module, resulting in that if the embossing depth of the pole piece before the rolling module is low, the poor extension of the pole piece is alleviated, and the problem of broken belt is still obvious after rolling. If the embossing depth before rolling is high, it is easy to cause damage to the pole piece. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a pole piece embossing roller pressing device to improve the pole piece breaking problem.

[0005] The present invention provides a pole piece embossing and rolling device, comprising a hot pre-pressing module, a pole tab embossing module, a pole piece front embossing module and a rolling module which are sequentially arranged along the pole piece belt direction; the hot pre-pressing module is used for performing hot pre-rolling treatment on the pole piece to reduce the thickness of the pole piece; the pole tab embossing module comprises a roller, on which a first embossing portion is arranged, and the first embossing portion is used for forming embossing in the pole tab area of ​​the pole piece; the pole piece front embossing module comprises a roller, on which a second embossing portion is arranged, and the second embossing portion is used for forming embossing in the coating area of ​​the pole piece; the rolling module is used for rolling treatment of the coating area and the pole tab area of ​​the pole piece.

[0006] In one embodiment of the present invention, the tab embossing module comprises a first roller and a second roller, the first roller and the second roller are arranged opposite to each other, and the tab area of ​​the pole piece passes between the first roller and the second roller to form embossing.

[0007] In one embodiment of the present invention, the pole piece front embossing module comprises a third roller and a fourth roller, the third roller and the fourth roller are arranged opposite to each other, and the coating area of ​​the pole piece passes between the third roller and the fourth roller to form embossing.

[0008] In one embodiment of the present invention, a post-pole piece embossing module is further included, which is located downstream of the rolling module. The post-pole piece embossing module includes a fifth roller and a sixth roller. The fifth roller and the sixth roller are arranged opposite to each other. The coating area of ​​the pole piece passes between the fifth roller and the sixth roller to form secondary embossing.

[0009] In one embodiment of the present invention, a pole tab magnetic induction heating module is further included, which is located between the thermal pre-pressing module and the pole tab embossing module and is used to extend the pole tab area of ​​the pole piece after the thermal pre-rolling treatment.

[0010] In one embodiment of the present invention, the tab magnetic induction heating module is a C-shaped open high-frequency magnetic induction heater or a high-frequency magnetic induction heater arranged up and down.

[0011] In one embodiment of the present invention, the depth of the first embossed portion ranges from 5 μm to 200 μm, and / or the width of the first embossed portion ranges from 10 μm to 500 μm.

[0012] In one embodiment of the present invention, the depth of the second embossed portion ranges from 5 μm to 300 μm, and / or the width of the second embossed portion ranges from 10 μm to 500 μm.

[0013] In one embodiment of the present invention, it also includes a first main transmission mechanism located upstream of the hot pre-pressing module; and a second main transmission mechanism located downstream of the rolling module; wherein the first main transmission mechanism and the second main transmission mechanism are used to drive the pole piece to move at a set speed and for tension isolation.

[0014] In one embodiment of the present invention, the first main transmission mechanism and the second main transmission mechanism respectively include a driving roller and a rubber pressure roller, the driving roller is used to drive the pole piece to move at a set speed, and the rubber pressure roller is used to cooperate with the driving roller to drive the pole piece to move at a set speed and for tension isolation.

[0015] In one embodiment of the present invention, a thickness measuring mechanism is further included, which is located downstream of the rolling module and is used to monitor the thickness of the pole piece after rolling in real time.

[0016] In one embodiment of the present invention, it also includes an unwinding structure for setting the pole piece; and a winding structure for winding the pole piece.

[0017] In one embodiment of the present invention, it also includes a first correcting mechanism located between the unwinding structure and the hot pre-pressing module, which is used to control the unwinding alignment of the pole piece; a second correcting mechanism located between the rolling module and the winding structure, which is used to control the winding alignment of the pole piece.

[0018] In one embodiment of the present invention, it also includes a first tension control mechanism, located between the unwinding structure and the hot pre-pressing module, for controlling the unwinding tension of the pole piece; a second tension control mechanism, located between the rolling module and the winding structure, for controlling the winding tension of the pole piece.

[0019] The present invention provides a pole piece embossing rolling method, comprising the following steps: performing a hot pre-rolling treatment on the pole piece to reduce the thickness of the pole piece; performing a pole ear embossing treatment on the pole piece's tab area to form embossing; performing a pre-rolling embossing treatment on the pole piece's coating area to form embossing; and performing a rolling treatment on the pole piece's coating area and tab area.

[0020] In one embodiment of the present invention, the method further comprises performing a post-rolling embossing treatment on the coating area of ​​the pole piece after the rolling treatment to form a secondary embossing.

[0021] In one embodiment of the present invention, the pressures of the embossing treatment before rolling and the embossing treatment after rolling are respectively set so that the embossing depth of the electrode coating area after rolling is 5% to 80% of the embossing depth before rolling.

[0022] In one embodiment of the present invention, the pressure of the hot pre-rolling is set so that the compression amount of the pole piece after the hot pre-rolling treatment is 5% to 60% of the total compression amount of the pole piece.

[0023] In one embodiment of the present invention, the method further comprises extending the pole lug region of the pole piece after the hot pre-rolling treatment.

[0024] In one embodiment of the present invention, the tab embossing treatment, the embossing treatment before rolling and the embossing treatment after rolling are hot embossing, and the embossing temperature is 80-120°C.

[0025] The pole piece embossing roller pressing device provided by the present invention performs separate embossing and stretching on the pole piece area according to the thickness difference between the coating area and the pole piece area, thereby effectively alleviating the wrinkle problem and the belt breakage problem caused by the inconsistent stretching of the pole piece; by respectively arranging the first embossing module and the second embossing module before and after the roller pressing module, the coating piece area is embossed twice, which not only effectively improves the belt breakage problem of the pole piece but also prevents the pole piece damage caused by excessive printing depth. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to make the above-mentioned objects, features and advantages of the present invention more clearly understood, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein:

[0027] Figure 1 It is a schematic structural diagram of a lithium battery pole piece according to an embodiment of the present invention;

[0028] Figure 2 is a schematic structural diagram of a pole piece embossing roller pressing device according to an embodiment of the present invention;

[0029] Figure 3 is a cross-sectional schematic diagram of a tab embossing module according to an embodiment of the present invention;

[0030] Figure 4 is a cross-sectional schematic diagram of a pole piece front embossing module according to an embodiment of the present invention;

[0031] Figure 5 It is a schematic structural diagram of the extension of the tab region of one embodiment of the present invention;

[0032] Figure 6 It is a schematic flow chart of a pole piece embossing roller pressing method according to an embodiment of the present invention. DETAILED DESCRIPTION

[0033] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0034] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0035] As shown in this application and claims, unless the context clearly indicates an exception, the words "a", "an", "an" and / or "the" do not refer to the singular and may also include the plural. Generally speaking, the terms "include" and "comprise" only indicate the inclusion of the steps and elements that have been clearly identified, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements.

[0036] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so that once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0037] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0038] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0039] Figure 1 FIG. 1 is a schematic diagram of the structure of a lithium battery electrode 10 according to an embodiment of the present invention. Figure 1As shown, the production process of the pole piece 10 includes stirring, coating, rolling, and slitting the pole lugs. The coating area 101 is formed by coating the battery slurry on part of the foil, and the blank area on both sides of the foil is cut into the pole lug area 102 by laser cutting technology. The thickness of the coating area 101 is greater than the thickness of the pole lug area 102. The role of rolling is to make the lithium battery active material and the foil more closely combined to improve the energy density of the battery. During the rolling process, the coating area 101 is close to the roller, and the foil of the coating area 101 is greatly extended under the pressure of the roller. The pole lug area 102 is in a suspended state. Under the pressure of the roller, the foil of the pole lug area 102 is less extended. The inconsistent extension of the coating area 101 and the pole lug area 102 easily causes wrinkles at the junction of the two. The current solution is to emboss the pole piece 10 through an embossing module to divide the pole piece 10 into several small areas, thereby dispersing the stress of the pole piece during rolling. However, the embossing module in this solution cannot perform embossing and extension on the pole tab area 101 due to the thickness difference between the pole piece coating area 101 and the pole tab area 102, resulting in limited improvement effect on the pole piece extension and tape breakage problems.

[0040] Figure 2 Schematic diagram of the structure of the pole piece embossing roller pressing device according to one embodiment of the present invention. Figure 2 As shown, the pole piece embossing rolling device 200 of the embodiment of the present invention includes a hot pre-pressing module 21, a pole tab embossing module 22, a pole piece front embossing module 23, and a rolling module 24, which are sequentially arranged along the belt direction of the pole piece 10. Among them, the hot pre-pressing module 21 is used to perform hot pre-rolling treatment on the coating area and the pole tab area of ​​the pole piece 10 to reduce the thickness of the pole piece. The pole tab embossing module 22 includes a first roller 22a and a second roller 22b, and the first roller 22a and the second roller 22b are provided with a first embossing portion A1, and the first embossing portion A1 is used to form embossing in the pole tab area of ​​the pole piece 10. The pole piece front embossing module 23 includes a third roller 23a and a fourth roller 23b, and the third roller 23a and the fourth roller 23b are provided with a second embossing portion A2, and the second embossing portion A2 is used to form embossing in the coating area of ​​the pole piece; the rolling module 24 is used to perform rolling treatment on the coating area and the pole tab area of ​​the pole piece 10.

[0041] like Figure 2As shown, the pole piece embossing roller pressing device 200 also includes an unwinding structure 201 and a winding structure 202. The unwinding structure 201 is used to set the pole piece 10, and the winding structure 202 is used to wind up the pole piece 10. There is a pole piece 10 on the unwinding mechanism 201, and the pole piece 10 is pulled through the hot pre-pressing module 21, the pole ear embossing module 22, the pole piece front embossing module 23, and the rolling module 24 in sequence to complete the embossing roller pressing process of the pole piece 10, and then the winding structure 202 winds up the pole piece 10 after the embossing roller pressing process. In the embodiment of the present invention, the hot pre-pressing module 21 includes a first hot pre-roller 21a and a second hot pre-roller 21b, and the first hot pre-roller 21a and the second hot pre-roller 21b are arranged in pairs so that the pole piece 10 passes between the first hot pre-roller 21a and the second hot pre-roller 21b, and the coating area and the pole ear area of ​​the pole piece 10 passing through the first hot pre-roller 21a and the second hot pre-roller 21b are subjected to hot pre-rolling treatment to reduce the thickness of the pole piece 10 and enhance the cohesive force between the particles of the pole piece 10. The hot pre-pressing module 21 has the characteristics of small pre-rolling pressure and small pole piece extension, which will not affect the substrate and is conducive to the subsequent processing of the pole piece 10.

[0042] Figure 3 FIG. 1 is a cross-sectional schematic diagram of a tab embossing module according to an embodiment of the present invention. Figure 3 As shown, the pole tab embossing module 22 includes a first roller 22a and a second roller 22b, and the first roller 22a and the second roller 22b are arranged opposite to each other, and the pole tab area 102 of the pole piece 10 passes between the first roller 22a and the second roller 22b to form embossing. The first roller 22a and the second roller 22b are provided with a first embossing portion A1. The first embossing portion A1 is wrapped around the first roller 22a and the second roller 22b respectively. The material of the first embossing portion A1 and the first roller 22a and the second roller 22b can be the same or different, and this application does not limit this. The first embossing portion A1 is used to emboss the pole tab area 102 of the pole piece 10 after the hot pre-rolling treatment. Through the embossing treatment, the pole tab area 102 is divided into a plurality of small areas, thereby dispersing the stress of the pole tab area 102 during rolling. In some embodiments, the first embossing portion A1 is only provided on the first roller 22a or the second roller 22b.

[0043] In some embodiments, the depth H1 of the first embossed portion A1 ranges from 5 μm to 200 μm (μm is micrometer) to form a corresponding embossing depth on the tab region, and the embossing depth is the depth of the depression of the embossed area of ​​the tab region. Thus, the stress of the tab region 102 during rolling is dispersed to each embossed area to prevent the pole piece 10 from having a broken belt problem. Optionally, the width W1 of the first embossed portion A1 ranges from 10 μm to 500 μm.

[0044] In some embodiments, the shape of the first embossed portion A1 is at least one of a rhombus, a square, a triangle, a circle, an ellipse, or an irregular polygon, which is not limited in the present application.

[0045] Figure 4 FIG. 1 is a cross-sectional schematic diagram of a pole piece front embossing module according to an embodiment of the present invention. Figure 4 As shown, the pole piece pre-embossing module 23 includes a third roller 23a and a fourth roller 23b, and the third roller 23a and the fourth roller 23b are arranged opposite to each other, and the coating area of ​​the pole piece 10 passes between the third roller 23a and the fourth roller 23b to form embossing. The third roller 23a and the fourth roller 23b are provided with a second embossing portion A2. The second embossing portion A2 is wrapped around the third roller 23a and / or the fourth roller 23b respectively. The material of the second embossing portion A2 and the third roller 23a and the fourth roller 23b can be the same or different, and the present application does not impose any restrictions on this. The second embossing portion A2 is used to perform embossing treatment on the coating area 101 of the pole piece 10 after the pole ear embossing treatment before the pole piece rolling. The coating area 101 is divided into several small areas after embossing treatment, thereby dispersing the stress of the coating area 101 during rolling. In some embodiments, the second embossing part A2 is provided only on the third roller 23a or the fourth roller 23b.

[0046] In some embodiments, the depth H2 of the second embossed portion A2 ranges from 5 μm to 300 μm, so as to form a corresponding embossing depth on the coating area, and the embossing depth is the depth of the depression of the embossed area of ​​the coating area. Thus, the stress of the coating area during rolling is dispersed to each embossed area, preventing the pole piece 10 from having a broken belt problem. Optionally, the width W2 of the second embossed portion A2 ranges from 10 μm to 500 μm.

[0047] In some embodiments, the shape of the second embossing portion A2 is at least one of a rhombus, a square, a triangle, a circle, an ellipse, or an irregular polygon, which is not limited in the present application.

[0048] Continue to refer Figure 2 As shown, the rolling module 24 includes a first rolling roller 24a and a second rolling roller 24b, the first rolling roller 24a and the second rolling roller 24b are arranged opposite to each other, the pole piece 10 passes between the first rolling roller 24a and the second rolling roller 24b, and the entire pole piece 10 including the coating area and the pole ear area is rolled. Through the rolling process, the lithium battery active material and the foil are more closely combined, and the energy density of the battery is improved.

[0049] like Figure 2As shown, the pole piece embossing rolling device 200 also includes a pole piece rear embossing module 25. The pole piece rear embossing module 25 is located downstream of the rolling module 24. The pole piece rear embossing module 24 includes a fifth roller 24a and a sixth roller 24b. The fifth roller 24a and the sixth roller 24b are arranged opposite to each other. The coating area of ​​the pole piece 10 after the rolling process passes between the fifth roller 24a and the sixth roller 24b to form a secondary embossing. In some embodiments, the pole piece rear embossing module 25 has the same structure as the pole piece front embossing module 23. For a detailed description of the pole piece rear embossing module 25, reference can be made to the above description of the pole piece front embossing module 23, which will not be repeated here.

[0050] The pole piece embossing rolling device 200 also includes a pole ear magnetic induction heating module 26. The pole ear magnetic induction heating module 26 is located between the thermal pre-pressing module 21 and the pole ear embossing module 22, and is used to extend the pole ear area of ​​the pole piece 10 after the thermal pre-rolling treatment. In some embodiments, the pole ear magnetic induction heating module 26 is a C-shaped open high-frequency magnetic induction heater or a high-frequency magnetic induction heater arranged up and down. Taking the C-shaped open high-frequency magnetic induction heater as an example, the structure of the pole ear magnetic induction heating module 26 is explained. Figure 5 Schematic diagram of the structure of the extension of the tab area of ​​one embodiment of the present invention. Figure 5 As shown, the pole ear magnetic induction heating module 26 includes a heating generator (not shown) and a C-shaped heating plate 261. The C-shaped heating plate 261 includes a first heating plate 261a, a second heating plate 261b and a first bracket 261c. One end of the first heating plate 261a and the second heating plate 261b is connected to the first bracket 261c. The first heating plate 261a and the second heating plate 261b can move in the first direction D1. The heating generator drives the first bracket 261c to rotate through the rotation of the motor, and then drives the first heating plate 261a and the second heating plate 261b on the first bracket 261c to rotate around the pole ear area 102 of the pole piece. The pole ear area 102 is heated by electromagnetic induction to improve the ductility of the pole ear area 102, and to alleviate or eliminate the problems of wrinkles, warping, etc. in the pole ear area 102 during subsequent embossing and rolling. In some embodiments, the magnetic induction heating module 26 further includes a position adjustment device (not shown), which is used to adjust the distance between the first heating plate 261a and the second heating plate 261b and the tab area 102 in the first direction D1, and the distance between the first heating plate 261a and the second heating plate 261b and the coating area 101 in the second direction D2. The first direction D1 is perpendicular to the second direction D2. Figure 5 As shown, in some embodiments, the distance S1 between the first heating plate 261a and the second heating plate 261b and the tab area 102 in the first direction D1 is 0.5-20 mm. The distance S2 between the first heating plate 261a and the second heating plate 261b and the coating area 101 in the second direction D2 is 0-3.0 mm.

[0051] like Figure 2As shown, the pole piece embossing roller pressing device 200 further includes a thickness measuring mechanism 27. The thickness measuring mechanism 27 is located downstream of the pole piece post-embossing module 25, and is used to monitor in real time the thickness of the pole piece 10 after the pole piece rolling post-embossing process.

[0052] In some embodiments, the pole piece embossing roller pressing device 200 further includes a first main transmission mechanism 28 and a second main transmission mechanism 29. In this embodiment, the first main transmission mechanism includes an active roller 281a and a rubber pressure roller 281b. The first main transmission mechanism 28 is located between the unwinding mechanism 201 and the hot pre-pressing module 21. The active roller 281a is used to drive the pole piece 10 to move at a set speed, and the rubber pressure roller 281b is used to cooperate with the active roller 281a to drive the pole piece 10 to move at a set speed and for tension isolation. The second main transmission mechanism 29 includes an active roller 291a and a rubber pressure roller 291b. The second main transmission mechanism 29 is located between the rolling module 24 and the winding mechanism 202. The active roller 291a is used to drive the pole piece 10 to move at a set speed, and the rubber pressure roller 291b is used to cooperate with the active roller 291a to drive the pole piece 10 to move at a set speed and for tension isolation.

[0053] In some embodiments, the pole piece embossing roller pressing device 200 further includes a first deviation correction mechanism 30 and a second deviation correction mechanism 31. The first deviation correction mechanism 30 is located between the unwinding structure 201 and the hot pre-pressing module 21, and is used to control the unwinding alignment of the pole piece 10. The second deviation correction mechanism 31 is located between the rolling module 24 and the winding structure 202, and is used to control the winding alignment of the pole piece 10.

[0054] In some embodiments, the pole piece embossing roller pressing device 200 further includes a first tension control mechanism 32 and a second tension control mechanism 33. The first tension control mechanism 32 is located between the unwinding structure 201 and the hot pre-pressing module 21, and is used to control the unwinding tension of the pole piece 10. The second tension control mechanism 33 is located between the rolling module 24 and the winding structure 202, and is used to control the winding tension of the pole piece 10.

[0055] The pole piece embossing roller pressing device provided by the present invention performs separate embossing and stretching on the pole piece area according to the thickness difference between the coating area and the pole piece area, thereby effectively alleviating the wrinkle problem and the belt breakage problem caused by the inconsistent stretching of the pole piece; by respectively arranging the first embossing module and the second embossing module before and after the roller pressing module, the coating piece area is embossed twice, which not only effectively improves the belt breakage problem of the pole piece but also prevents the pole piece damage caused by excessive printing depth.

[0056] The present invention also provides a pole piece embossing roller pressing method, which can be implemented by the pole piece embossing roller pressing device described above. Therefore, the detailed description of the pole piece embossing roller pressing device described above can be used to illustrate the pole piece embossing roller pressing method of the present invention, and will not be repeated here. The pole piece embossing roller pressing method can also be implemented by other pole piece embossing roller pressing devices, and the present application does not limit the structure implemented by the pole piece embossing roller pressing method.

[0057] Figure 6 FIG. 6 is a flow chart of a pole piece embossing rolling method 600 according to an embodiment of the present invention. Figure 6 As shown, the pole piece embossing roller pressing method 600 includes the following steps:

[0058] Step S601: performing a hot pre-rolling process on the pole piece to reduce the thickness of the pole piece;

[0059] Step S602: performing a tab embossing process on the tab area of ​​the pole piece to form embossing;

[0060] Step S603: performing embossing treatment on the coating area of ​​the electrode before rolling to form embossing;

[0061] Step S604: Rolling the coating area and the tab area of ​​the pole piece.

[0062] In some embodiments, the pole piece embossing rolling method further includes the step of: performing post-rolling embossing treatment on the coating area of ​​the pole piece after the rolling treatment to form secondary embossing.

[0063] In some embodiments, the pole piece embossing rolling method further includes the steps of: respectively setting the pressure of the embossing treatment before rolling and the embossing treatment after rolling, so that the embossing depth of the pole piece coating area after rolling is 5% to 80% of the embossing depth before rolling.

[0064] In some embodiments, the pole piece embossing rolling method further includes the step of setting the pressure of the hot pre-rolling so that the compression amount of the pole piece after the hot pre-rolling treatment is 5% to 60% of the total compression amount of the pole piece.

[0065] In some embodiments, the pole piece embossing rolling method further comprises the step of setting the temperature of the hot pre-rolling to 80-120°C.

[0066] In some embodiments, the pole piece embossing rolling method further includes the step of: performing an extension treatment on the pole lug area of ​​the pole piece after the hot pre-rolling treatment.

[0067] In some embodiments, the pole piece embossing rolling method further includes the steps of setting the pole ear embossing treatment, the embossing treatment before rolling and the embossing treatment after rolling to hot embossing, and the embossing temperature is 80-120°C.

[0068] The pole piece embossing roller pressing method provided by the present invention targets the thickness difference between the coating area and the pole ear area, performs separate embossing and stretching on the pole ear area, and effectively alleviates the wrinkle problem and belt breakage problem caused by inconsistent stretching of the pole piece; by performing embossing treatment before and after the roller pressing treatment, the belt breakage problem of the pole piece is effectively improved and the pole piece damage caused by excessive printing depth is prevented.

[0069] The basic concepts have been described above. Obviously, for those skilled in the art, the above invention disclosure is only used as an example and does not constitute a limitation of the present application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements and amendments to the present application. Such modifications, improvements and amendments are suggested in the present application, so such modifications, improvements and amendments still belong to the spirit and scope of the exemplary embodiments of the present application.

[0070] At the same time, the present application uses specific words to describe the embodiments of the present application. For example, "one embodiment", "an embodiment", and / or "some embodiments" refer to a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or more in different positions in this specification does not necessarily refer to the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the present application can be appropriately combined.

[0071] In some embodiments, numbers describing the number of components and attributes are used. It should be understood that such numbers used in the description of the embodiments are modified by the modifiers "about", "approximately" or "substantially" in some examples. Unless otherwise specified, "about", "approximately" or "substantially" indicate that the numbers are allowed to vary by ±20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximate values, which may change according to the required features of individual embodiments. In some embodiments, the numerical parameters should take into account the specified significant digits and adopt the general method of retaining digits. Although the numerical domains and parameters used to confirm the breadth of their range in some embodiments of the present application are approximate values, in specific embodiments, the setting of such numerical values ​​is as accurate as possible within the feasible range.

Claims

1. A pole piece embossing roller pressing device, characterized in that: It includes a hot pre-pressing module, a pole ear embossing module, a pole piece front embossing module, a rolling module and a pole piece rear embossing module which are sequentially arranged along the pole piece belt direction; The hot pre-pressing module is used to perform hot pre-rolling treatment on the pole piece to reduce the thickness of the pole piece; The tab embossing module comprises a roller, on which a first embossing portion is provided, and the first embossing portion is used to form embossing on the tab area of ​​the pole piece; The pole piece front embossing module comprises a roller, on which a second embossing portion is arranged, and the second embossing portion is used to form embossing on the coating area of ​​the pole piece; The rolling module is used to roll the coating area and the tab area of ​​the pole piece; The pole piece post-embossing module is located downstream of the rolling module, and the pole piece post-embossing module includes a fifth roller and a sixth roller, the fifth roller and the sixth roller are arranged opposite to each other, and the coating area of ​​the pole piece passes between the fifth roller and the sixth roller to form secondary embossing.

2. The pole piece embossing roller pressing device according to claim 1, characterized in that: The pole tab embossing module comprises a first roller and a second roller, wherein the first roller and the second roller are arranged opposite to each other, and the pole tab area of ​​the pole piece passes between the first roller and the second roller to form embossing.

3. The pole piece embossing roller pressing device according to claim 1, characterized in that: The pole piece front embossing module comprises a third roller and a fourth roller, the third roller and the fourth roller are arranged opposite to each other, and the coating area of ​​the pole piece passes between the third roller and the fourth roller to form embossing.

4. The pole piece embossing roller pressing device according to claim 1, characterized in that: Also includes: The pole tab magnetic induction heating module is located between the thermal pre-pressing module and the pole tab embossing module, and is used to extend the pole tab area of ​​the pole piece after the thermal pre-rolling treatment.

5. The pole piece embossing roller pressing device according to claim 4, characterized in that: The tab magnetic induction heating module is a C-shaped open high-frequency magnetic induction heater or a high-frequency magnetic induction heater arranged up and down.

6. The pole piece embossing roller pressing device according to claim 1, characterized in that: The depth of the first embossed portion ranges from 5 μm to 200 μm, and / or the width of the first embossed portion ranges from 10 μm to 500 μm.

7. The pole piece embossing roller pressing device according to claim 1, characterized in that The depth of the second embossed portion is in the range of 5 μm to 300 μm, and / or the width of the second embossed portion is in the range of 10 μm to 500 μm.

8. The pole piece embossing roller pressing device according to claim 1, characterized in that: Also includes: A first main transmission mechanism, located upstream of the hot pre-pressing module; The second main transmission mechanism is located downstream of the rolling module; wherein the first main transmission mechanism and the second main transmission mechanism are used to drive the pole piece to move at a set speed and for tension isolation.

9. The pole piece embossing roller pressing device according to claim 8, characterized in that: The first main transmission mechanism and the second main transmission mechanism respectively include a driving roller and a rubber pressure roller, the driving roller is used to drive the pole piece to move at a set speed, and the rubber pressure roller is used to cooperate with the driving roller to drive the pole piece to move at a set speed and for tension isolation.

10. The pole piece embossing roller pressing device according to claim 1, characterized in that: Also includes: The thickness measuring mechanism is located downstream of the rolling module and is used for real-time monitoring of the thickness of the pole piece after rolling.

11. The pole piece embossing roller pressing device according to claim 1, characterized in that: Also includes: An unwinding structure, used for setting the pole piece; The winding structure is used for winding the pole piece.

12. The pole piece embossing roller pressing device according to claim 11, characterized in that: Also includes: A first deviation correction mechanism, located between the unwinding structure and the thermal pre-pressing module, for controlling the unwinding alignment of the pole piece; The second deviation correction mechanism is located between the rolling module and the winding structure, and is used to control the winding alignment of the pole piece.

13. The pole piece embossing roller pressing device according to claim 11, characterized in that: Also includes: A first tension control mechanism, located between the unwinding structure and the thermal pre-pressing module, for controlling the unwinding tension of the pole piece; The second tension control mechanism is located between the rolling module and the winding structure, and is used to control the winding tension of the pole piece.

14. A pole piece embossing roller pressing method, characterized in that: include: Performing a hot pre-rolling process on the pole piece to reduce the thickness of the pole piece; Performing a tab embossing process on the tab area of ​​the pole piece to form embossing; Performing embossing treatment on the coating area of ​​the pole piece before rolling to form embossing; Performing roller pressing on the coating area and the tab area of ​​the pole piece; The coating area of ​​the pole piece after the rolling process is subjected to a post-rolling embossing process to form a secondary embossing process.

15. The pole piece embossing roller pressing method according to claim 14, characterized in that: The pressure of the hot pre-rolling is set so that the compression amount of the pole piece after the hot pre-rolling treatment is 5% to 60% of the total compression amount of the pole piece.

16. The pole piece embossing roller pressing method according to claim 14, characterized in that: Also includes: The pole ear area of ​​the pole piece after the hot pre-rolling treatment is extended.

17. The pole piece embossing roller pressing method according to claim 14, characterized in that: The pressures of the embossing treatment before rolling and the embossing treatment after rolling are respectively set so that the embossing depth of the electrode coating area after rolling is 5% to 80% of the embossing depth before rolling.

18. The pole piece embossing roller pressing method according to claim 14, characterized in that: The tab embossing treatment, the pre-rolling embossing treatment and the post-rolling embossing treatment are hot embossing, and the embossing temperature is 80-120°C.

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