Hot pressing roller device for rolling pole piece

Abstract

The invention relates to the technical field of battery production, and discloses a hot pressing roller device for rolling a pole piece. The hot pressing roller device comprises a hot pressing roller, an input pipe and a connector assembly, specifically, the hot pressing roller is provided with a heating channel, and the heating channel extends along the central axis of the hot pressing roller. The input pipe is inserted into the heating channel, at least one outlet is formed in the pipe wall of the input pipe, and the at least one outlet is communicated with the heating channel. The connector assembly is connected with the hot pressing roller and provided with an input channel and an output channel. Wherein the input channel and the output channel are located at the same end of the heating channel, the input channel is communicated with the input pipe, and the output channel is communicated with the heating channel. In the hot-pressing roller device, the heat-conducting medium can perform countercurrent flow heat exchange with the heat-conducting medium in the input pipe in the backflow process in the heating channel, so that a part of heat is absorbed, the temperature difference between the heat-conducting media at the two ends of the heating channel is reduced, and the temperature of the heat-conducting media in the heating channel is relatively balanced.

Description

Technical Field

[0001] The invention relates to the technical field of battery production, and in particular to a hot pressing roller device for rolling pole sheets. Background Art

[0002] As an energy storage unit, lithium batteries can realize the mutual conversion of chemical energy and electrical energy. Lithium batteries are widely used in production and life. For example, in the field of new energy vehicles, a certain number of lithium batteries can be combined to form a battery pack to provide power for new energy vehicles.

[0003] The production process of lithium batteries includes multiple steps, including the preparation of electrodes. Electrodes can be prepared by dry electrode technology. In one prior art, the preparation of electrodes by dry electrode technology mainly includes the following steps: first, the active material is mixed with electrode materials such as conductive agents and binders to form a mixture; then, the mixture is rolled onto the surface of the current collector by a hot pressing roller to form an electrode.

[0004] In the process of preparing electrodes, the temperature of the hot pressing roller surface has a great influence on the bonding and compaction of the electrode material and the current collector. When the temperature distribution on the hot pressing roller surface is uneven, the bonding and compaction effects of the electrode material and the current collector in different regions of the prepared electrode will be different, which will affect the performance of the electrode. Therefore, how to improve the uniformity of the temperature distribution on the hot pressing roller surface is the key to improving the performance of the electrode. Summary of the invention

[0005] The present invention provides a hot pressing roller device for rolling electrode sheets, which is used to improve the uniformity of roller surface temperature distribution, thereby improving the rolling effect and further improving the performance of the electrode.

[0006] The embodiment of the present invention provides a hot pressing roller device for rolling a pole piece, the hot pressing roller device comprises a hot pressing roller, an input pipe and a joint assembly; wherein:

[0007] The hot pressing roller has a heating channel, and the heating channel extends along the central axis of the hot pressing roller;

[0008] The input pipe is inserted into the heating channel, and the pipe wall of the input pipe is provided with at least one outlet; the at least one outlet is connected to the heating channel, and the at least one outlet is used to transport the heat-conducting medium into the heating channel;

[0009] The joint assembly is connected to the hot pressing roller, and the joint assembly has an input channel and an output channel, and the input channel and the output channel are located at the same end of the heating channel; the input channel is connected to the input pipe, and the input channel is used to transport the heat-conducting medium into the input pipe; the output channel is connected to the heating channel, and the output channel is used to output the heat-conducting medium in the heating channel.

[0010] The beneficial effects of the hot pressing roller device provided by the embodiment of the present invention are as follows:

[0011] During the operation of the above-mentioned hot pressure roller device, the heat-conducting medium enters the heating channel through the input channel and the input pipe in turn. In the heating channel, the heat-conducting medium and the hot pressure roller exchange heat, so that the roller surface temperature of the hot pressure roller increases. After the heat-conducting medium releases heat in the heating channel, the temperature decreases, and then flows out through the output channel. In the heating channel, the heat-conducting medium surrounds the input pipe, and the flow direction of the heat-conducting medium in the heating channel is opposite to the flow direction of the heat-conducting medium in the input pipe. Therefore, the heat-conducting medium in the heating channel will perform countercurrent heat exchange with the heat-conducting medium in the input pipe during the reflux process, so that the heat-conducting medium in the heating channel can absorb a part of the heat during the reflux process, thereby reducing the temperature difference between the heat-conducting medium at both ends of the heating channel, so that the temperature of the heat-conducting medium in the heating channel is more balanced.

[0012] In the heating channel, the heat carried by the heat-conducting medium will be transferred from the center of the hot pressing roller to the roller surface. When the temperature of the heat-conducting medium is relatively uniform, the roller surface of the hot pressing roller is also heated relatively evenly, thereby reducing the temperature difference between different areas of the roller surface, thereby improving the rolling effect of the pole piece during the production process of the pole piece and ensuring the performance of the pole piece. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A schematic diagram of a structure of a hot pressing roller device for rolling electrode sheets provided in an embodiment of the present application;

[0014] Figure 2 for Figure 1 A partial schematic diagram of the hot pressing roller device shown;

[0015] Figure 3 A schematic diagram of the structure of a hot pressing roller provided in an embodiment of the present application;

[0016] Figure 4 for Figure 1 AA section view of the hot pressing roller device is shown.

[0017] Reference numerals:

[0018] 10- hot pressing roller; 101- heating channel;

[0019] 102-working roll segment; 1021-first end surface;

[0020] 103-first roller segment; 104-second roller segment;

[0021] 20-input pipe; 201-export;

[0022] 201a-first exit; 201b-second exit;

[0023] 21-Part 1; 22-Part 2;

[0024] 30-connector assembly; 301-input channel;

[0025] 302-output channel; 303-first interface;

[0026] 304- second interface; 40- support member. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the example embodiments of the present application to clearly and completely describe the technical solutions in the example embodiments of the present application. The example embodiments described herein are only for illustrative purposes and are not intended to limit the scope of protection of the present application. Therefore, it should be understood that various modifications and changes can be made to the example embodiments without departing from the scope of protection of the present application.

[0028] In the description of the present application, unless otherwise expressly specified and limited, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance; the term "plurality" refers to two or more; the term "and / or" includes any and all combinations of one or more associated listed items. In particular, reference to "the / the" object or "an" object is also intended to indicate one of a possible plurality of such objects.

[0029] Unless otherwise specified or explained, the terms "connection", "fixed", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, an electrical connection, or a signal connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0030] Further, in the description of the present application, it should be understood that the directional words such as "upper", "lower", "inner", "outer" and the like described in the example embodiments of the present application are described at the angles shown in the accompanying drawings and should not be understood as limitations on the example embodiments of the present application. It should also be understood that, in the context, when it is mentioned that an element or feature is connected to another element (one or more) "upper", "lower", "inner", "outer", it can not only be directly connected to the other (one or more) elements "upper", "lower", "inner", "outer", but also can be indirectly connected to the other (one or more) elements "upper", "lower", "inner", "outer" through an intermediate element.

[0031] Figure 1 A schematic diagram of a structure of a hot pressing roller device for rolling a pole piece provided in an embodiment of the present application, Figure 2 for Figure 1 The partial schematic diagram of the hot pressing roller device shown is as follows: Figure 1 and Figure 2 As shown, in some embodiments, the hot pressing roller device includes a hot pressing roller 10, an input pipe 20 and a joint assembly 30. Specifically, the hot pressing roller 10 has a heating channel 101, and the heating channel 101 extends along the central axis of the hot pressing roller 10. When the heating channel 101 is specifically set, the length of the heating channel 101 along the extension direction of the above-mentioned central axis is less than the length of the hot pressing roller 10 along this direction. The hot pressing roller 10 has a third end face and a fourth end face, and the third end face and the fourth end face are located at both ends of the hot pressing roller 10 in this direction, wherein one end of the heating channel 101 passes through the third end face of the hot pressing roller 10, and there is a preset distance between the other end of the heating channel 101 and the fourth end face of the hot pressing roller 10.

[0032] The input pipe 20 is inserted into the heating channel 101 and extends from one end to the other end of the heating channel 101. The wall of the input pipe 20 has at least one outlet 201, which is connected to the heating channel 101 and used to transport the heat transfer medium into the heating channel 101.

[0033] The joint assembly 30 is connected to the hot pressing roller 10 and is located at the end of the hot pressing roller 10. Optionally, the joint assembly 30 and the hot pressing roller 10 are connected by a flange. The joint assembly 30 has an input channel 301 and an output channel 302, and the input channel 301 and the output channel 302 are not connected to each other. The input channel 301 and the output channel 302 are located at the same end of the heating channel 101, wherein the input channel 301 is connected to the input pipe 20 for inputting a heat-conducting medium into the input pipe 20; the output channel 302 is connected to the heating channel 101 for outputting the heat-conducting medium in the heating channel 101.

[0034] In order to improve the sealing effect between the joint assembly 30 and the hot press roller 10, in one embodiment, a seal is provided between the joint assembly 30 and the hot press roller 10, and the seal is in close contact with the joint assembly 30 and the hot press roller 10, thereby reducing the risk of oil leakage at the connection between the joint assembly 30 and the hot press roller 10.

[0035] During the operation of the above-mentioned hot pressing roller device, the heat-conducting medium enters the heating channel 101 through the input channel 301 and the input pipe 20 in sequence. In the heating channel 101, the heat-conducting medium and the hot pressing roller 10 exchange heat, so that the roller surface temperature of the hot pressing roller 10 increases. After the heat-conducting medium releases heat in the heating channel 101, the temperature decreases, and then flows out through the output channel 302. In the heating channel 101, the heat-conducting medium surrounds the input pipe 20, and the flow direction of the heat-conducting medium in the heating channel 101 is opposite to the flow direction of the heat-conducting medium in the input pipe 20. Therefore, the heat-conducting medium in the heating channel 101 will perform countercurrent heat exchange with the heat-conducting medium in the input pipe 20 during the flow process, so that the heat-conducting medium in the heating channel 101 can absorb a part of the heat during the reflux process, thereby reducing the temperature difference between the heat-conducting medium at both ends of the heating channel 101, so that the temperature of the heat-conducting medium in the heating channel 101 is more balanced.

[0036] In the heating channel 101, the heat carried by the heat-conducting medium will be transferred from the center of the hot pressing roller 10 to the roller surface. When the temperature of the heat-conducting medium is relatively uniform, the roller surface of the hot pressing roller 10 is also heated relatively uniformly, thereby reducing the temperature difference between different areas of the roller surface, thereby improving the rolling effect of the pole piece during the production process of the pole piece and ensuring the performance of the pole piece.

[0037] In addition, in the above-mentioned hot pressing roller device, the hot pressing roller 10 adopts a large-diameter single hole (heating channel 101) design, thereby reducing the number of processing holes, simplifying the structure of the hot pressing roller 10, and reducing the processing difficulty of the hot pressing roller 10. In addition, the heat-conducting medium can flow in from one end of the hot pressing roller 10 and flow out from the same end of the hot pressing roller 10, thereby shortening the transmission pipeline outside the hot pressing roller 10, reducing the heat loss of the heat-conducting medium when flowing in the above-mentioned transmission pipeline, and improving the heating effect of the heat-conducting medium.

[0038] Figure 3 A schematic diagram of the structure of the hot pressing roller provided in the embodiment of the present application is shown as follows: Figure 3As shown, in one embodiment, the hot pressing roller 10 includes a working roller segment 102 and a first roller segment 103. The working roller segment 102 is used to roll the electrode sheet, and the working roller segment 102 is located between the joint assembly 30 and the first roller segment 103. In other words, the first roller segment 103 is located at the end of the working roller segment 102 away from the joint assembly 30. When the heating channel 101 is provided in the hot pressing roller 10, the heating channel 101 passes through the working roller segment 102, and the end of the heating channel 101 away from the joint assembly 30 is located in the first roller segment 103.

[0039] In the above-mentioned hot pressing roller 10, since the heating channel 101 runs through the working roller segment 102, the heat carried by the heat-conducting medium in the working roller segment 102 can be conducted from the center of the working roller segment 102 to the roller surface of the working roller segment 102 along the radial direction of the working roller segment 102, thereby reducing the temperature difference between the two ends of the roller surface of the working roller segment 102 and improving the uniformity of the roller surface temperature distribution of the working roller segment 102. In addition, the heat-conducting medium can flow into the inside of the first roller segment 103, so that the temperature of the first roller segment 103 is increased, thereby reducing the temperature difference between the first roller segment 103 and the working roller segment 102, reducing the heat conduction from the working roller segment 102 to the first roller segment 103, making the temperature difference between the end of the working roller segment 102 close to the first roller segment 103 and the middle of the working roller segment 102 smaller, thereby improving the uniformity of the temperature distribution.

[0040] like Figure 3 As shown, in one embodiment, the working roll segment 102 has a first end face 1021, and the first end face 1021 is located at one end of the working roll segment 102 facing the first roll segment 103. If the maximum distance between the first end face 1021 and the end face of the heating channel 101 away from the joint assembly 30 is represented by d1, when the value of d1 is large, the length of the heating channel 101 will be long, so that there will be more heat-conducting medium in the heating channel 101, which will cause heat waste. When the value of d1 is small, the length of the heating channel 101 beyond the first end face 1021 is small, and the heat diffusion of the heat-conducting medium at the end of the heating channel 101 away from the joint assembly 30 will reduce the heat absorption rate of the portion of the working roll segment 102 close to the first end face 1021.

[0041] In view of the above situation, in one embodiment, d1 satisfies the following formula: 145mm≤d1≤165mm. Optionally, the value of d1 can be 148mm, 150mm, 152mm, 154mm, 156mm, 158mm, 160mm, 162mm, 164mm or other values ​​satisfying the above formula, which are not listed one by one in this application. When the value of d1 satisfies the above range, the heating channel 101 can have an appropriate length, thereby reducing the waste of heat and ensuring the heat absorption effect of the portion of the working roll segment 102 close to the first end surface 1021.

[0042] It is worth noting that the end surface of the heating channel 101 away from the joint assembly 30 can be a plane, a cone or other curved surface. When the end surface of the heating channel 101 away from the joint assembly 30 is a plane, the above d1 is the distance between the first end surface 1021 and the end surface. When the end surface of the heating channel 101 away from the joint assembly 30 is a cone, the above d1 is the distance between the first end surface 1021 and the vertex of the cone.

[0043] Please continue to refer to Figure 3 In one embodiment, the hot pressing roller 10 further includes a second roller segment 104, which is located at one end of the working roller segment 102 close to the joint assembly 30. That is, the working roller segment 102 is located between the second roller segment 104 and the first roller segment 103. With reference to the joint assembly 30, the second roller segment 104 is close to the joint assembly 30, and the first roller segment 103 is far away from the joint assembly 30. With reference to the diameter of the working roller segment 102, the diameter of the first roller segment 103 is smaller than the diameter of the working roller segment 102, and the diameter of the second roller segment 104 is also smaller than the diameter of the working roller segment 102. The diameter of the first roller segment 103 and the diameter of the second roller segment 104 can be equal or different.

[0044] The heating channel 101 is arranged in the hot pressing roller 10 , and the heating channel 101 runs through the second roller segment 104 and the working roller segment 102 , and one end of the heating channel 101 away from the joint assembly 30 is located in the first roller segment 103 .

[0045] Please continue to refer to Figure 3 , D1 represents the diameter of the working roll segment 102, and D2 represents the diameter of the heating channel 101. When the value of D2 / D1 is large, the structural strength of the hot pressing roller 10 will be affected, and the hot pressing roller 10 will be easily deformed under a large pressure. When the value of D2 / D1 is small, the distance between the roller surface of the working roll segment 102 and the inner wall of the heating channel 101 in the radial direction is large, which makes the heat conduction path longer and the heat loss larger, affecting the temperature of the working roll surface.

[0046] In view of the above situation, in one embodiment, D1 and D2 satisfy the following formula: 0.3≤D2 / D1≤0.35. Optionally, the value of D2 / D1 can be 0.31, 0.32, 0.33, 0.34 or other values ​​satisfying the above formula, which are not listed one by one in this application. When the value of D2 / D1 satisfies the above range, the structural strength of the working roll segment 102 can be ensured, so that the working roll segment 102 can withstand a large pressure, and the heating effect of the heat-conducting medium on the roll surface can be ensured, reducing heat loss.

[0047] When the input pipe 20 is specifically set, Figure 1As shown, d2 represents the maximum distance between one end of the input pipe 20 away from the joint assembly 30 and the end face of the heating channel 101 away from the joint assembly 30. When the value of d2 is large, the end of the heating channel 101 away from the joint assembly 30 is prone to form a circulation dead angle, thereby affecting the circulation of the heat transfer medium. When the value of d2 is small, the length of the input pipe 20 extending into the heating channel 101 is relatively long, making the end of the input pipe 20 away from the joint assembly 30 prone to bending and deformation.

[0048] In view of the above situation, in one embodiment, the value of d2 satisfies the following formula: 165mm≤d2≤180mm. Optionally, the value of d2 can be 168mm, 170mm, 172mm, 174mm, 176mm, 178mm or other values ​​that satisfy the above formula, which are not listed one by one in this application. When the value of d2 satisfies the above range, it can reduce the risk of forming a circulation dead angle at the end of the heating channel 101 away from the joint assembly 30, promote the circulation of the heat-conducting medium in the heating channel 101, and reduce the length of the input pipe 20 extending into the heating channel 101, reducing the risk of deformation of the input pipe 20.

[0049] It is worth noting that the end surface of the heating channel 101 away from the joint assembly 30 can be a plane, a cone or other curved surface. When the end surface of the heating channel 101 away from the joint assembly 30 is a plane, the above d2 is the distance between the end of the input pipe 20 away from the joint assembly 30 and the end surface. When the end surface of the heating channel 101 away from the joint assembly 30 is a cone, the above d2 is the distance between the end of the input pipe 20 away from the joint assembly 30 and the apex of the cone.

[0050] If the first end face 1021 of the working roll segment 102 is used as a reference, the input pipe 20 can be completely located on the side of the plane where the first end face 1021 is located facing the joint assembly 30, or a portion of the input pipe 20 is located on the side of the plane where the first end face 1021 is located facing the joint assembly 30, and the other portion is located on the side of the plane where the first end face 1021 is located away from the joint assembly 30.

[0051] In order to improve the heat exchange effect between the heat-conducting medium in the input pipe 20 and the heat-conducting medium in the heating channel 101, in one embodiment, the input pipe 20 can be a metal pipe. In addition to having good thermal conductivity, the metal pipe also has greater rigidity and is not prone to bending and deformation.

[0052] like Figure 1 and Figure 2As shown, in one embodiment, the input pipe 20 includes a first portion 21 and a second portion 22, and the first portion 21 and the second portion 22 are arranged along the extension direction of the central axis of the hot pressing roller 10. Among them, the first portion 21 is located in the heating channel 101, and the second portion 22 is located in the output channel 302. During the circulation of the heat-conducting medium, the heat-conducting medium with a higher temperature enters the heating channel 101 through the second portion 22 of the input pipe 20 and the first portion 21 of the input pipe 20 in sequence. After the heat-conducting medium exchanges heat with the hot pressing roller 10 in the heating channel 101, it flows out through the output channel 302.

[0053] In order to reduce the heat exchange between the heat-conducting medium and the heat-conducting medium in the second part 22 of the input pipe 20 during the flow of the heat-conducting medium in the output channel 302, in one embodiment, the side wall of the second part 22 has a heat-insulating layer. The heat-insulating layer has a heat-insulating effect on the heat-conducting medium in the second part 22, which can reduce the heat conduction from the heat-conducting medium in the second part 22 to the heat-conducting medium in the output channel 302, or in other words, reduce the heat exchange between the liquid inlet end and the liquid outlet end, so that the heat-conducting medium entering the heating channel 101 has a higher temperature.

[0054] In a specific embodiment, the input pipe 20 is a straight pipe, and one end of the second portion 22 of the input pipe 20 away from the first portion 21 is connected to the input channel 301 in the joint assembly 30. The input pipe 20 has a small resistance to the heat-conducting medium, which can increase the flow rate of the heat-conducting medium, thereby improving the heating effect of the heat-conducting medium on the hot pressing roller 10.

[0055] When the outlet 201 is provided on the wall of the input pipe 20, Figure 1 As shown, in one embodiment, the wall of the input pipe 20 has a plurality of outlets 201, and among the plurality of outlets 201, at least some of the outlets 201 are arranged at intervals along the length direction of the input pipe 20. That is to say, the input pipe 20 is provided with outlets 201 at different positions along the length direction. The plurality of outlets 201 are all located at the portion of the input pipe 20 extending into the heating channel 101, and these outlets 201 can replenish high-temperature heat-conducting medium to different positions of the heating channel 101, so that the temperature difference of the heat-conducting medium in different areas of the heating channel 101 is small, and the temperature distribution of the heat-conducting medium is more uniform, so that the roller surface of the hot pressing roller 10 is also heated more uniformly, and the rolling effect of the hot pressing roller 10 is further improved. In addition, the heat-conducting medium in the heating channel 101 can be merged with the heat-conducting medium flowing out of the plurality of outlets 201 during the reflux process, so that the heat lost by the heat-conducting medium during the reflux process can be replenished, thereby reducing the temperature difference of the heat-conducting medium in different areas of the heating channel 101 and improving the uniformity of the temperature distribution.

[0056] When the plurality of outlets 201 are specifically arranged, the plurality of outlets 201 include a variety of arrangement methods. In one embodiment, the plurality of outlets 201 are arranged in sequence along the length direction of the input pipe 20. In another embodiment, Figure 1 As shown, the plurality of outlets 201 include at least two first outlets 201a, which are located on the side wall of the input pipe 20 and are distributed along the circumferential direction. During operation of the hot pressing roller 10, the heat-conducting medium can be sprayed toward the surroundings of the heating channel 101 through the first outlets 201a, thereby improving the uniformity of the heat-conducting medium distribution and correspondingly improving the uniformity of the roller surface temperature.

[0057] In a specific embodiment, the side wall of the input pipe 20 has multiple groups of the first outlets 201a, and the multiple groups of the first outlets 201a are arranged at intervals along the length direction of the input pipe 20. Each group includes at least two first outlets 201a, and the at least two first outlets 201a are distributed along the circumferential direction.

[0058] Please continue to refer to Figure 1 In addition to the first outlet 201a, the plurality of outlets 201 further include at least one second outlet 201b, which is located at the end wall of the input pipe 20 away from the joint assembly 30. During operation of the hot pressing roller 10, the heat-conducting medium can be sprayed toward the end of the heating channel 101 away from the joint assembly 30 through the at least one second outlet 201b, which can replenish the heat-conducting medium for the end of the heating channel 101 away from the joint assembly 30, and can accelerate the circulation of the heat-conducting medium at the end of the heating channel 101 away from the joint assembly 30, thereby improving the heating effect of the heat-conducting medium.

[0059] In order to reduce the bending deformation of the portion of the input pipe 20 extending into the heating channel 101, as shown in FIG. Figure 1 As shown, in one embodiment, a support member 40 is provided between the end of the input pipe 20 away from the joint assembly 30 and the inner wall of the heating channel 101. The support member 40 can support the end of the input pipe 20 away from the joint assembly 30, thereby reducing the risk of bending and deformation of the end of the input pipe 20 away from the joint assembly 30. Optionally, the support member 40 and the input pipe 20 are fixed by bonding, and the support member 40 and the inner wall of the heating channel 101 are fixed by bonding.

[0060] When the support member 40 is specifically provided, the support member 40 includes various structural forms. Figure 4As shown, in one embodiment, the orthographic projection of the support member 40 on a plane perpendicular to the central axis of the heating channel 101 covers a portion of the area between the orthographic projection of the input pipe 20 on the above plane and the orthographic projection of the heating channel 101 on the above plane. The area between the orthographic projection of the input pipe 20 on the above plane and the orthographic projection of the heating channel 101 on the above plane is an annular area, and the orthographic projection of the support member 40 on the above plane only covers a portion of the annular area, and does not completely cover the annular area. In other words, the spaces on both sides of the heating channel 101 of the support member 40 are connected, and the heat-conducting medium can flow to the side of the support member 40 away from the joint assembly 30 after being ejected from the input pipe 20, so that the entire heating channel 101 can be filled with the heat-conducting medium.

[0061] In another embodiment, the support member 40 may be an annular structure, and the orthographic projection of the support member 40 on a plane perpendicular to the central axis of the heating channel 101 completely covers the area between the orthographic projection of the input pipe 20 on the plane and the orthographic projection of the heating channel 101 on the plane. The support member 40 may improve the supporting effect of the input pipe 20 and improve the stability of the input pipe 20.

[0062] When the joint assembly 30 is specifically set, Figure 2 As shown, in one embodiment, the surface of the joint assembly 30 has a first interface 303 and a second interface 304, and the first interface 303 and the second interface 304 are used to communicate with external pipelines. The first interface 303 is connected to the input channel 301, and the second interface 304 is connected to the output channel 302, and the first interface 303 is located at the end of the second interface 304 away from the hot pressing roller 10. Compared with the first interface 303, the second interface 304 is closer to the hot pressing roller 10, so that the heat-conducting medium inside the hot pressing roller 10 can be quickly exported to heat the heat-conducting medium and improve the circulation efficiency of the heat-conducting medium.

[0063] Please continue to refer to Figure 2 When the output channel 302 is specifically set, the output channel 302 includes a first sub-channel 3021 and a second sub-channel 3022. The first sub-channel 3021 is set along the extension direction of the central axis of the hot pressing roller 10, and the second part 22 of the input pipe 20 is located in the first sub-channel 3021. The second sub-channel 3022 is located at the side of the first sub-channel 3021, and one end of the second sub-channel 3022 is connected to the first sub-channel 3021, and the other end of the second sub-channel 3022 is connected to the second interface 304. Optionally, the central axis of the second sub-channel 3022 is perpendicular to the central axis of the first sub-channel 3021. One end of the input channel 301 is connected to the second part 22 of the input pipe 20, and the other end of the input channel 301 is connected to the first interface 303.

[0064] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A hot pressing roller device for rolling pole pieces, characterized in that: It includes a hot pressing roller, an input pipe and a joint assembly; A heating channel is provided in the hot pressing roller, and the heating channel extends along the central axis of the hot pressing roller; The input pipe is inserted into the heating channel, and the pipe wall of the input pipe has at least one outlet; the at least one outlet is connected to the heating channel and is used to transport the heat-conducting medium into the heating channel; The joint assembly is connected to the hot pressing roller, and the joint assembly has an input channel and an output channel, and the input channel and the output channel are located at the same end of the heating channel; the input channel is connected to the input pipe, and the input channel is used to transport the heat-conducting medium into the input pipe; the output channel is connected to the heating channel, and the output channel is used to output the heat-conducting medium in the heating channel.

2. The hot pressing roller device for rolling electrode sheets according to claim 1, characterized in that: The input pipe comprises a first part and a second part, and the first part and the second part are arranged along the extension direction of the central axis of the hot pressing roller; The first part is located in the heating channel, the second part is located in the output channel, and a side wall of the second part has a heat insulation layer.

3. The hot pressing roller device for rolling electrode sheets according to claim 1, characterized in that: The hot pressing roller comprises a working roller segment and a first roller segment, wherein the working roller segment is used for rolling the electrode sheet, and the first roller segment is located at one end of the working roller segment away from the joint assembly; The heating channel runs through the working roll segment, and one end of the heating channel away from the joint assembly is located in the first roll segment.

4. The hot pressing roller device for rolling electrode sheets according to claim 3, characterized in that: The working roll segment has a first end surface, and the first end surface is located at one end of the working roll segment facing the first roll segment; The maximum distance between the first end surface and the end surface of the heating channel away from the joint assembly is d1, and d1 satisfies the following formula: 145mm≤d1≤165mm.

5. The hot pressing roller device for rolling electrode sheets according to claim 3, characterized in that: The hot pressing roller further comprises a second roller segment, and the second roller segment is located at one end of the working roller segment close to the joint assembly; The diameter of the first roll segment and the diameter of the second roll segment are both smaller than the diameter of the working roll segment.

6. The hot pressing roller device for rolling electrode sheets according to any one of claims 1 to 5, characterized in that: The maximum distance between the end of the input pipe away from the joint assembly and the end face of the heating channel away from the joint assembly is d2, and d2 satisfies the following formula: 165mm≤d2≤180mm.

7. The hot pressing roller device for rolling electrode sheets according to any one of claims 1 to 5, characterized in that: The hot pressing roller comprises a working roller segment, the diameter of the working roller segment is D1, the diameter of the heating channel is D2, and D1 and D2 satisfy the following formula: 0.3≤D2 / D1≤0.

35.

8. The hot pressing roller device for rolling electrode sheets according to any one of claims 1 to 5, characterized in that: The surface of the joint assembly has a first interface and a second interface, the first interface and the second interface are used to communicate with an external pipeline; the first interface is connected to the input channel, the second interface is connected to the output channel, and the first interface is located at an end of the second interface away from the hot pressing roller.

9. The hot pressing roller device for rolling electrode sheets according to any one of claims 1 to 5, characterized in that: The tube wall of the input tube has a plurality of the outlets, and among the plurality of the outlets, at least some of the outlets are arranged at intervals along the length direction of the input tube.

10. The hot pressing roller device for rolling electrode sheets according to claim 9, characterized in that: The plurality of outlets include at least two first outlets, the at least two first outlets are located on the side wall of the input pipe, and the at least two first outlets are arranged along the circumferential direction.

11. The hot pressing roller device for rolling electrode sheets according to claim 9, characterized in that: The plurality of outlets include at least one second outlet, and the at least one second outlet is located at an end wall of the input pipe away from the joint assembly.

12. The hot pressing roller device for rolling electrode sheets according to any one of claims 1 to 5, characterized in that: A support member is arranged between one end of the input pipe away from the joint assembly and the inner wall of the heating channel.

13. The hot pressing roller device for rolling electrode sheets according to claim 12, characterized in that: The orthographic projection of the support member on a plane perpendicular to the central axis of the heating channel covers a partial area between the orthographic projection of the input pipe on the plane and the orthographic projection of the heating channel on the plane.

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