Pole piece rolling device and roller press

Abstract

The utility model relates to the technical field of battery manufacturing, in particular to a pole piece rolling device and a roller squeezer, the pole piece rolling device comprises a first hot roller, a second hot roller and a guide piece, the axis of the second hot roller is parallel to the axis of the first hot roller, and a gap allowing a pole piece to penetrate through is formed between the first hot roller and the second hot roller; the first hot roller and the second hot roller are respectively used for extruding the pole piece in the gap, the guide piece is used for guiding the pole piece to reach the gap along a preset path, in at least part of the preset path, the pole piece is wound on at least part of the outer wall of the first hot roller or the second hot roller, and the temperature of the outer wall of the first hot roller or the second hot roller is used for preheating the pole piece to be rolled. The pole piece is preheated and rolled on the hot roller, so that a set of preheating roller equipment is omitted, the structural complexity is reduced, and the equipment cost is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of battery manufacturing, and in particular to a pole piece rolling device and a rolling machine. Background Art

[0002] At present, blade batteries and short blade batteries are widely welcomed by the market due to their safety, reliability and high volume density. The electrode rolling process is generally: the positive electrode is rolled by a hot roller, and the negative electrode is rolled by a cold roller. In the positive electrode rolling, the electrode sheet will be preheated before the main hot roller to ensure that the electrode sheet reaches the appropriate temperature during rolling.

[0003] Generally, a preheating roller is set in front of the main hot roller to preheat the pole piece. The preheating roller equipment structure is relatively complex, and a set of preheating rollers costs about RMB 150,000, so the equipment cost is relatively high.

[0004] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present application, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Utility Model Content

[0005] The present application provides a pole piece rolling device and a rolling machine, which are used to solve the problems of complex structure of preheating roller equipment and high equipment cost in the prior art.

[0006] On the one hand, the present application provides a pole piece rolling device, comprising:

[0007] A first hot roller;

[0008] a second hot roller, wherein the axis of the second hot roller is parallel to the axis of the first hot roller, a gap for the pole piece to pass through is formed between the first hot roller and the second hot roller, and the first hot roller and the second hot roller are respectively used to squeeze the pole piece in the gap;

[0009] A guide member is used to guide the pole piece to reach the gap along a preset path. In at least part of the preset path, the pole piece is wound around at least part of the outer wall of the first hot roller or the second hot roller.

[0010] In one possible design, the area around the pole piece on the outer wall of the first hot roller or the second hot roller is a preheating area, and the orthographic projection of the preheating area on a preset plane is a first arc. The preset plane is a plane perpendicular to the axis of the first hot roller, and the central angle corresponding to the first arc is greater than 90 degrees.

[0011] In a possible design, the guide member includes a first roller, the axis of the first roller is parallel to the axis of the first hot roller, and the pole piece passes over the outer wall of the first roller, the first hot roller or the second hot roller in turn to reach the gap.

[0012] In a possible design, the two opposite sides of the first hot roller are respectively a first side and a second side, the pole piece passes through the gap from the first side into the second side, and the first passing roller is arranged on the second side.

[0013] In a possible design, the guide also includes a second roller, the axis of the second roller is parallel to the axis of the first hot roller, and the pole piece passes over the outer wall of the second roller, the first roller, the first hot roller or the second hot roller in sequence to reach the gap.

[0014] In a possible design, the second roller is arranged on the first side.

[0015] In a possible design, the pole piece rolling device also includes a heat-conducting pipe and a heat-conducting medium. The heat-conducting pipe is respectively arranged in the first heat roller and the second heat roller. The heat-conducting pipe is used to transfer the heat of the heat-conducting medium to the outer wall of the first heat roller and the second heat roller.

[0016] In a possible design, a cylindrical cavity is provided in each of the first heat roller and the second heat roller, and the heat conducting pipe includes:

[0017] A first pipeline is arranged at the axis of the cylindrical cavity, and an inlet of the first pipeline is used to introduce a heat transfer medium into the first pipeline;

[0018] A second pipe is disposed in the cylindrical cavity, and an inlet of the second pipe is connected to an outlet of the first pipe;

[0019] A third pipeline is evenly arranged on the inner wall of the cylindrical cavity, and an inlet of the third pipeline is connected with an outlet of the second pipeline;

[0020] a fourth pipe, disposed in the cylindrical cavity, wherein an inlet of the fourth pipe is connected to an outlet of the third pipe;

[0021] The fifth pipeline is arranged at the axis of the cylindrical cavity, the inlet of the fifth pipeline is connected with the outlet of the fourth pipeline, and the outlet of the fifth pipeline is used to export the heat-conducting medium in the fifth pipeline.

[0022] In a possible design, the axis of the third pipe is parallel to the axis of the cylindrical cavity, and the heat-conducting pipe also includes a sixth pipe, which is arranged between two adjacent third pipes, wherein the inlet of the sixth pipe is connected to the outlet of one of the third pipes, and the outlet of the sixth pipe is connected to the inlet of the other third pipe.

[0023] On the other hand, the present application also provides a roller press, comprising the pole piece rolling device as described above.

[0024] The beneficial effects of this application are as follows:

[0025] The pole piece rolling device provided in the present application enables the pole piece to reach the gap along a preset path by arranging a guide member. In the preset path, the pole piece is wound around at least a portion of the outer wall of the first hot roller or the second hot roller, so that the pole piece can contact the outer wall of the first hot roller or the second hot roller before reaching the gap. The temperature of the outer wall of the first hot roller or the second hot roller is used to preheat the pole piece to be rolled, so that the pole piece completes the two processes of preheating and rolling on the hot roller, thereby eliminating a set of preheating roller equipment, reducing structural complexity, and reducing equipment costs.

[0026] The roller press provided in the present application includes the pole piece rolling device in the present application, and thus also includes all the above-mentioned advantages of the pole piece rolling device. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 It is a structural schematic diagram of a pole piece preheating rolling mechanism in the prior art;

[0029] Figure 2 A schematic diagram of the structure of a pole piece rolling device provided in one embodiment of the present application;

[0030] Figure 3 A schematic structural diagram of a pole piece rolling device provided in another embodiment of the present application;

[0031] Figure 4 A schematic structural diagram of a heat-conducting pipe of a pole piece rolling device provided in one embodiment of the present application;

[0032] Figure 5 Another schematic diagram of the structure of the heat-conducting pipe of the pole piece rolling device provided in one embodiment of the present application.

[0033] Reference numerals:

[0034] 1'-first preheating roller, 2'-second preheating roller, 3'-heating roller;

[0035] 110-first hot roller, 120-second hot roller, 200-gap, 300-guide, 310-first over roller, 320-second over roller, 400-pole piece, 500-column cavity, 610-first pipe, 620-second pipe, 630-third pipe, 631-one pipe, 632-two pipes, 633-three pipes, 640-fourth pipe, 650-fifth pipe, 661-fourth pipe, 662-five pipes. DETAILED DESCRIPTION

[0036] The technical solution of the present application will be described clearly and completely below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0037] In the positive electrode rolling process of the electrode piece 400, the electrode piece 400 is preheated before the main rolling roller is heated to ensure that the electrode piece 400 reaches a suitable temperature during rolling. Figure 1 As shown, after the pole piece 400 is pre-stretched, the pole piece 400 passes through the outer walls of the first preheating roller 1' and the second preheating roller 2' in sequence, and the pole piece 400 is preheated on the outer walls of the first preheating roller 1' and the second preheating roller 2'. The preheated pole piece 400 then enters between the two hot pressing rollers 3' to complete the rolling. A protective plate needs to be installed above the preheating roller to prevent people from being scalded. In this way, the preheating roller equipment structure is more complicated and the equipment cost is higher.

[0038] To solve the above problems, the following Figure 2-Figure 5 , describes the pole piece 400 rolling device provided in the embodiment of the present application, including a first hot roller 110, a second hot roller 120 and a guide member 300. The axis of the first hot roller 110 is parallel to the axis of the second hot roller 120, and a gap 200 for the pole piece 400 to pass through is formed between the first hot roller 110 and the second hot roller 120. The first hot roller 110 and the second hot roller 120 are respectively used to squeeze the pole piece 400 in the gap 200. The guide member 300 is used to guide the pole piece 400 to reach the gap 200 along a preset path. In at least part of the preset path, the pole piece 400 is wound around at least part of the outer wall of the first hot roller 110 or the second hot roller 120.

[0039] The first hot roller 110 and the second hot roller 120 are components for rolling the pole piece 400. In some embodiments, the first hot roller 110 is arranged directly below the second hot roller 120, and the outer walls of the first hot roller 110 and the second hot roller 120 are both cylindrical, and the gap 200 is formed between the highest position of the outer wall of the first hot roller 110 and the lowest position of the outer wall of the second hot roller 120, and the thickness of the gap 200 is less than the thickness of the pole piece 400. The pole piece 400 extends from one side of the gap 200 through the gap 200 to the other side. In the process of the pole piece 400 passing through the gap 200, the first hot roller 110 and the second hot roller 120 roll the pole piece 400 in the gap 200. In some embodiments, the first hot roller 110 and the second hot roller 120 are both oil hot rollers. In some other embodiments, the first hot roller 110 and the second hot roller 120 are both electric hot rollers.

[0040] The guide is a component used to change the transmission direction of the electrode. Specifically, the outer wall of the guide is columnar, the axis of the guide is parallel to the axis of the first hot roller 110, and the pole piece 400 can bypass the outer wall of the guide, thereby changing the transmission direction of the pole piece 400. In some embodiments, the guide is a rotating shaft, and the rotating shaft is parallel to the axis of the first hot roller 110. In some other embodiments, the guide is a rotating roller, and the axis of the rotating roller is parallel to the axis of the first hot roller 110. In other embodiments, the guide can rotate, and the guide smoothly completes the transportation of the pole piece 400 by rotating, so that the pole piece 400 can be transmitted along the first path.

[0041] Reference Figure 2 As shown, in some embodiments, the pole piece 400 bypasses the guide and the first hot roller 110 in sequence to enter the gap 200, wherein the first path is the conveying path of the electrode between the guide and the first hot roller. In other embodiments, the pole piece 400 bypasses the guide and the second hot roller 120 in sequence to enter the gap 200, wherein the first path is the conveying path of the electrode between the guide and the second hot roller.

[0042] By utilizing the technical solution of the above-mentioned embodiment, by setting a guide member 300, the pole piece 400 can reach the gap 200 along a preset path. In the preset path, the pole piece 400 is wound around at least a portion of the outer wall of the first hot roller 110 or the second hot roller 120, so that the pole piece 400 can contact the outer wall of the first hot roller 110 or the second hot roller 120 before reaching the gap 200, and the temperature of the outer wall of the first hot roller 110 or the second hot roller 120 is used to preheat the pole piece 400 to be rolled, so that the pole piece 400 completes the two processes of preheating and rolling on the hot roller, thereby eliminating a set of preheating roller equipment, reducing structural complexity, and reducing equipment costs.

[0043] Reference Figure 2 , Figure 3As shown, in some embodiments of the present application, the outer wall of the first heat roller 110 or the second heat roller 120 corresponding to the area around which the pole piece 400 is arranged is a preheating area, and the orthographic projection of the preheating area on a preset plane is a first arc, and the preset plane is a plane perpendicular to the axis of the first heat roller 110, and the central angle corresponding to the first arc is greater than 90 degrees. In some embodiments, the area on the outer wall of the first heat roller 110 corresponding to the pole piece 400 is a preheating area, and the orthographic projection of the preheating area on a plane perpendicular to the axis of the first heat roller 110 is a first arc. One end point of the first arc is point A on the outer wall of the first heat roller 110 corresponding to the gap 200, and the other end point of the first arc is point B on the first heat roller 110 where contact with the pole piece 400 begins. The first arc is an arc between point A and point B, and the center angle corresponding to the first arc is greater than 90 degrees. For example, the center angle corresponding to the first arc can be 100 degrees, 120 degrees, 140 degrees, 160 degrees, 180 degrees, 200 degrees, etc.

[0044] By utilizing the technical solution of the above-mentioned embodiment, by making the central angle corresponding to the first arc greater than 90 degrees, the contact area between the pole piece 400 and the outer wall of the first heat roller 110 or the second heat roller 120 is increased, and the contact time between the pole piece 400 and the outer wall of the first heat roller 110 or the second heat roller 120 is increased, thereby effectively improving the preheating effect of the first heat roller 110 or the second heat roller 120 on the pole piece 400.

[0045] Reference Figure 2 , Figure 3 As shown, in some embodiments of the present application, the guide member 300 includes a first roller 310, the axis of the first roller 310 is parallel to the axis of the first hot roller 110, and the pole piece 400 sequentially bypasses the outer wall of the first roller 310, the first hot roller 110 or the second hot roller 120 to reach the gap 200. In some embodiments, the width of the first roller 310 is equal to the width of the first hot roller 110. In this way, the pole piece 400 can bypass the outer wall of the first roller 310, thereby changing the transmission direction of the pole piece 400, so that the pole piece 400 can bypass the outer wall of the first roller 310, the first hot roller 110 or the second hot roller 120 in turn to reach the gap 200.

[0046] Reference Figure 2As shown, in some embodiments of the present application, the two opposite sides of the first heat roller 110 are the first side and the second side, respectively, the pole piece 400 passes through the gap 200 from the first side to enter the second side, and the first over roller 310 is arranged on the second side. In some embodiments, the left side of the first heat roller 110 is the first side, the right side of the first heat roller 110 is the second side, the pole piece 400 passes through the gap 200 from the right side of the first heat roller 110 to enter the left side of the first heat roller 110, the first over roller 310 is arranged at a position near the lower end of the left side of the first heat roller 110, the pole piece 400 goes around the left side outer wall of the first over roller 310 and then goes around the right side outer wall of the first heat roller 110, and the pole piece 400 that goes around the right side outer wall of the first heat roller 110 then enters the gap 200 and is rolled by the first heat roller 110 and the second heat roller 120.

[0047] In some embodiments, the highest point of the first roller 310 is higher than the lowest point of the first hot roller 110, so that the central angle corresponding to the first arc can be greater than 180 degrees.

[0048] By utilizing the technical solution of this embodiment, by setting the first roller 310 on the second side, the contact area between the pole piece 400 and the outer wall of the first heat roller 110 or the second heat roller 120 can be increased, and the contact time between the pole piece 400 and the outer wall of the first heat roller 110 or the second heat roller 120 can be increased, thereby effectively improving the preheating effect of the first heat roller 110 or the second heat roller 120 on the pole piece 400.

[0049] Reference Figure 3 As shown, in some embodiments, the first over roller 310 may also be disposed on the first side. Specifically, the first over roller 310 is disposed on the right side of the first hot roller 110 near the lower end, and the pole piece 400 goes around the left outer wall of the first over roller 310 and then goes around the right outer wall of the first hot roller 110. The pole piece 400 that goes around the right outer wall of the first hot roller 110 then enters the gap 200 and is rolled by the first hot roller 110 and the second hot roller 120.

[0050] Reference Figure 2 As shown, in some embodiments of the present application, the guide member 300 further includes a second roller 320, the axis of the second roller 320 is parallel to the axis of the first hot roller 110, and the pole piece 400 sequentially bypasses the outer wall of the second roller 320, the first roller 310, the first hot roller 110 or the second hot roller 120 to reach the gap 200. By setting the second roller 320, the pole piece 400 can be guided to the position of the first roller 310, so that the pole piece 400 sequentially bypasses the outer wall of the second roller 320, the first roller 310, the first hot roller 110 or the second hot roller 120 to reach the gap 200.

[0051] Reference Figure 2As shown, in some embodiments of the present application, the second over-roller 320 is disposed on the first side. It should be noted that the conveying direction of the pole piece 400 is from the right side of the first hot roller 110 through the gap 200 to the left side of the first hot roller 110, so the pole piece 400 is conveyed from the right side of the gap 200. By arranging the second over-roller 320 on the right side of the first hot roller 110, the pole piece 400 on the right side can be smoothly guided to the position of the first over-roller 310, so that the pole piece 400 bypasses the outer wall of the second over-roller 320, the first over-roller 310, the first hot roller 110 or the second hot roller 120 in turn and reaches the gap 200.

[0052] In some embodiments of the present application, the pole piece 400 rolling device further includes a heat-conducting pipe and a heat-conducting medium, the heat-conducting medium is filled in the heat-conducting pipe, the heat-conducting pipe is respectively arranged in the first heat roller 110 and the second heat roller 120, and the heat-conducting pipe is used to transfer the heat of the heat-conducting medium to the outer wall of the first heat roller 110 and the second heat roller 120. In some embodiments, the heat-conducting medium is a heated high-temperature liquid, for example, the heat-conducting medium is heat-conducting oil, and another example is heat-conducting water. The heat-conducting medium can circulate in the heat-conducting pipe to transfer the heat to the outer wall of the first heat roller 110 and the second heat roller 120.

[0053] By utilizing the technical solution of the above embodiment, the heat of the heat conducting medium is transferred to the outer walls of the first heat roller 110 and the second heat roller 120 through the heat conducting pipe, thereby preheating the pole piece 400 on the outer walls of the first heat roller 110 and the second heat roller 120.

[0054] Reference Figure 5As shown, in some embodiments of the present application, a cylindrical cavity 500 is respectively provided in the first heat roller 110 and the second heat roller 120, and the heat-conducting pipe includes a first pipe 610, a second pipe 620, a third pipe 630 and a fourth pipe 640. The first pipe 610 is arranged at the axis of the cylindrical cavity 500, and the inlet of the first pipe 610 is used to introduce the heat-conducting medium into the first pipe 610. The second pipe 620 is arranged in the cylindrical cavity 500, and the inlet of the second pipe 620 is connected to the outlet of the first pipe 610. The third pipe 630 is evenly arranged on the inner wall of the cylindrical cavity 500, and the inlet of the third pipe 630 is connected to the outlet of the second pipe 620. The fourth pipe 640 is evenly arranged on the inner wall of the cylindrical cavity 500, and the inlet of the fourth pipe 640 is connected to the outlet of the third pipe 630. The fifth pipe 650 is disposed at the axis of the cylindrical cavity 500 , the inlet of the fifth pipe 650 is connected to the outlet of the third pipe 630 , and the outlet of the fifth pipe 650 is used to guide the heat transfer medium in the fifth pipe 650 out. In some embodiments, the first pipe 610 is installed on the left section of the axis of the cylindrical cavity 500, the third pipe 630 is installed on the inner wall of the cylindrical cavity 500, the second pipe 620 is installed obliquely in the cylindrical cavity 500, the second pipe 620 connects the first pipe 610 with the third pipe 630, the fourth pipe 640 is installed obliquely in the cylindrical cavity 500, the fourth pipe 640 connects the third pipe 630 with the fifth pipe 650, the fifth pipe 650 is installed on the right section of the axis of the cylindrical cavity 500, the inlet of the first pipe 610 is connected to the external circulation pipe, the heated heat-conducting medium enters the first pipe 610 through the external circulation pipe, and then flows through the second pipe 620, the third pipe 630, and the fourth pipe 640 in sequence, and then flows back from the outlet of the fifth pipe 650 to the external circulation pipe for reheating.

[0055] In some embodiments, the third pipe 630 is spirally installed on the inner wall of the cylindrical cavity 500, and the heat-conducting medium flows from the left end to the right end along a spiral path in the third pipe 630, thereby heating the pole pieces 400 on the outer walls of the first heat roller 110 and the second heat roller 120.

[0056] In some embodiments, the third pipe 630 is arranged on the inner wall of the cylindrical cavity 500 along the axial direction of the cylindrical cavity 500, and the heat-conducting medium flows from the left end to the right end along a straight path in the third pipe 630, thereby heating the pole piece 400 on the outer wall of the first heat roller 110 and the second heat roller 120.

[0057] By utilizing the technical solution of the above embodiment, the heat-conducting pipe is continuously circulated in the first pipe 610, the second pipe 620, the third pipe 630, the fourth pipe 640 and the fifth pipe 650, so that the heat-conducting medium itself can maintain a relatively high temperature, thereby improving the preheating effect of the pole piece 400 on the outer wall of the first heat roller 110 and the second heat roller 120.

[0058] Reference Figure 4 , Figure 5 As shown, in some embodiments of the present application, the axis of the third pipe 630 is parallel to the axis of the cylindrical cavity 500, and the heat-conducting pipe also includes a sixth pipe, which is arranged between two adjacent third pipes 630, wherein the inlet of the sixth pipe is connected to the outlet of one of the third pipes 630, and the outlet of the sixth pipe is connected to the inlet of the other third pipe 630. In some embodiments, three third pipes 630 and two sixth pipes form a group, and the three third pipes 630 in the same group are pipe 1 631, pipe 2 632 and pipe 3 633, respectively, and the two sixth pipes in the same group are pipe 4 661 and pipe 5 662, respectively, the pipe 1 631 and one end of the pipe 2 632 are connected through pipe 4 661, and the other end of the pipe 2 632 and pipe 3 633 are connected through pipe 5 662, and the heat transfer medium flows from pipe 1 631 through pipe 4 661 into pipe 2 632, flows from one end of pipe 2 632 into the other end, and then flows into pipe 3 633 through pipe 5 662, thereby forming a unidirectional flow path between the three third pipes 630 in the same group. It is only necessary to connect the two third pipes 630 located on both sides of the single third pipe 630 in the same group with the second pipe 620, so as to form a unidirectional flow path between the three third pipes 630 in the same group.

[0059] It should be noted that the number of the third pipe 630 and the sixth pipe in the same group is designed according to the temperature of the heat transfer medium and the preheating temperature, so as to reduce heat waste while ensuring a good heat transfer effect.

[0060] By utilizing the technical solution of the above embodiment, by connecting the inlet of the sixth pipe with the outlet of one of the third pipes 630, and connecting the outlet of the sixth pipe with the inlet of another third pipe 630, a one-way flow path is formed between the third pipes 630 in the same group, thereby slowing down the circulation speed of the heat transfer medium, maximizing the use of heat energy, and reducing heat energy waste.

[0061] The working process and principle of the pole piece 400 rolling device are as follows:

[0062] The heat-conducting oil heated by the mold temperature controller is inputted from the first pipeline 610, and flows through the second pipeline 620, the third pipeline 630, the fourth pipeline 640 and the fifth pipeline 650 in sequence. Since the third pipeline 630 is distributed on the inner wall of the first heat roller 110 and the second heat roller 120, the heat-conducting medium can transfer the heat of the heat-conducting medium to the outer wall of the first heat roller 110 and the second heat roller 120 in the process of flowing through the third pipeline 630, and heat the outer wall of the first heat roller 110 and the second heat roller 120, so that the surface of the first heat roller 110 and the second heat roller 120 is kept at a high temperature, so as to better roll the positive electrode material. After the pole piece 400 enters the roller main machine, it bypasses the second over-roller 320 and the first over-roller 310 in sequence, and then is wound around the outer wall of the first heat roller 110. The pole piece 400 contacts the outer wall of the first heat roller 110, and the pole piece 400 is preheated before rolling by the high temperature of the surface of the first heat roller 110. The preheated pole piece 400 reaches the gap 200 for rolling.

[0063] The present application also provides a roller press, including the pole piece 400 rolling device of any of the above embodiments. Since the roller press includes the pole piece 400 rolling device, it also includes all the advantages of the above embodiments of the pole piece 400 rolling device, which will not be repeated here.

[0064] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0065] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0066] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0067] In the present application, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0068] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A pole piece rolling device, characterized in that: include: A first hot roller; a second hot roller, wherein the axis of the second hot roller is parallel to the axis of the first hot roller, a gap for the pole piece to pass through is formed between the first hot roller and the second hot roller, and the first hot roller and the second hot roller are respectively used to squeeze the pole piece in the gap; A guide member is used to guide the pole piece to reach the gap along a preset path. In at least part of the preset path, the pole piece is wound around at least part of the outer wall of the first hot roller or the second hot roller.

2. The pole piece rolling device according to claim 1, characterized in that: The area around the outer wall of the first hot roller or the second hot roller corresponding to the pole piece is a preheating area, and the orthographic projection of the preheating area on a preset plane is a first arc, and the preset plane is a plane perpendicular to the axis of the first hot roller, and the central angle corresponding to the first arc is greater than 90 degrees.

3. The pole piece rolling device according to claim 1, characterized in that: The guide member includes a first passing roller, the axis of which is parallel to the axis of the first heating roller, and the pole piece passes over the outer wall of the first passing roller, the first heating roller or the second heating roller in sequence to reach the gap.

4. The pole piece rolling device according to claim 3, characterized in that: The first hot roller has two opposite sides, namely a first side and a second side. The pole piece passes through the gap from the first side into the second side. The first passing roller is arranged on the second side.

5. The pole piece rolling device according to claim 4, characterized in that: The guide member also includes a second roller, the axis of which is parallel to the axis of the first hot roller, and the pole piece passes over the outer wall of the second roller, the first roller, the first hot roller or the second hot roller in sequence to reach the gap.

6. The pole piece rolling device according to claim 5, characterized in that: The second roller is arranged on the first side.

7. The pole piece rolling device according to any one of claims 1 to 6, characterized in that: It also includes a heat-conducting pipe and a heat-conducting medium. The heat-conducting pipe is respectively arranged in the first heat roller and the second heat roller. The heat-conducting pipe is used to transfer the heat of the heat-conducting medium to the outer wall of the first heat roller and the second heat roller.

8. The pole piece rolling device according to claim 7, characterized in that: The first heat roller and the second heat roller are respectively provided with a cylindrical cavity, and the heat conduction pipe comprises: A first pipe is arranged at the axis of the cylindrical cavity, and an inlet of the first pipe is used to introduce the heat transfer medium into the first pipe; A second pipe is disposed in the cylindrical cavity, and an inlet of the second pipe is connected to an outlet of the first pipe; a third pipe, evenly arranged on the inner wall of the cylindrical cavity, the inlet of the third pipe being connected to the outlet of the second pipe; a fourth pipe, disposed in the cylindrical cavity, wherein an inlet of the fourth pipe is connected to an outlet of the third pipe; The fifth pipeline is arranged at the axis of the cylindrical cavity, the inlet of the fifth pipeline is connected with the outlet of the fourth pipeline, and the outlet of the fifth pipeline is used to export the heat-conducting medium in the fifth pipeline.

9. The pole piece rolling device according to claim 8, characterized in that: The axis of the third pipe is parallel to the axis of the cylindrical cavity. The heat-conducting pipe also includes a sixth pipe, which is arranged between two adjacent third pipes, wherein the inlet of the sixth pipe is connected to the outlet of one of the third pipes, and the outlet of the sixth pipe is connected to the inlet of the other third pipe.

10. A roller press, characterized in that: It comprises the pole piece rolling device as described in any one of claims 1 to 9.

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