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

[0001] This application is a divisional application. The original application has the application number 202411615435.7 and the original application date is November 13, 2024. The original application is entitled "A hot pressing roller device for pressing electrode sheets". The entire contents of the original application are incorporated herein by reference. Technical Field

[0002] This invention relates to the field of battery manufacturing technology, and in particular to a hot pressing roller device for pressing electrode sheets. Background Technology

[0003] Lithium-ion batteries, as an energy storage unit, can convert chemical energy into electrical energy. They have wide applications in production and daily life. For example, in the field of new energy vehicles, a certain number of lithium-ion batteries can be combined to form a battery pack, thereby providing power to new energy vehicles.

[0004] The manufacturing process of lithium batteries involves multiple steps, including electrode preparation. Electrodes can be prepared using dry electrode technology. In one existing technology, the preparation of electrodes using 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 pressed onto the surface of the current collector through a hot press roller to form the electrode.

[0005] During electrode fabrication, the temperature of the hot press roller surface significantly affects the adhesion and compaction of the electrode material and the current collector. Uneven temperature distribution on the hot press roller surface leads to variations in the adhesion and compaction of the electrode material and current collector in different regions, thus impacting electrode performance. Therefore, improving the uniformity of temperature distribution on the hot press roller surface is crucial for enhancing electrode performance. Summary of the Invention

[0006] This invention provides a hot pressing roller device for pressing electrodes, which improves the uniformity of temperature distribution on the roller surface, thereby improving the pressing effect and enhancing the performance of the electrode.

[0007] This invention provides a hot pressing roller device for pressing electrode sheets, the hot pressing roller device including a hot pressing roller, an input pipe and a connector assembly; wherein: The hot press roller has a heating channel that extends along the central axis of the hot press roller. 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 deliver a heat-conducting medium into the heating channel; The connector assembly is connected to the hot press roller. The connector 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 is used to deliver the heat-conducting medium into the input pipe. The output channel is connected to the heating channel and is used to output the heat-conducting medium in the heating channel.

[0008] The beneficial effects of the hot press roller device provided in this embodiment of the invention are as follows: In the aforementioned hot press roller device, the heat transfer medium sequentially enters the heating channel through the input channel and the input pipe. Within the heating channel, heat exchange occurs between the heat transfer medium and the hot press roller, causing the roller surface temperature to rise. After releasing heat within the heating channel, the heat transfer medium cools and then flows out through the output channel. Within the heating channel, the heat transfer medium surrounds the input pipe, and its flow direction within the heating channel is opposite to its flow direction within the input pipe. Therefore, during the recirculation process, the heat transfer medium in the heating channel undergoes counter-current heat exchange with the heat transfer medium in the input pipe, allowing it to absorb some heat during the recirculation. This reduces the temperature difference between the heat transfer medium at both ends of the heating channel, resulting in a more uniform temperature of the heat transfer medium within the heating channel.

[0009] Within the heating channel, the heat carried by the heat-conducting medium is conducted 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 uniformly, thereby reducing the temperature difference between different areas of the roller surface. This improves the rolling effect of the electrode during the electrode manufacturing process and ensures the performance of the electrode. Attached Figure Description

[0010] Figure 1 A schematic diagram of a hot pressing roller device for pressing electrode sheets provided in an embodiment of this application; Figure 2 for Figure 1 A partial schematic diagram of the hot press roller device is shown; Figure 3 This is a schematic diagram of the structure of a hot press roller provided in an embodiment of this application; Figure 4 for Figure 1 The diagram shows a cross-sectional view (AA) of the hot press roller device.

[0011] Figure label: 10-Hot press roller; 101-Heating channel; 102 - Working roll section; 1021 - First end face; 103 - First roller section; 104 - Second roller section; 20 - Input tube; 201 - Output tube; 201a - Exit 1; 201b - Exit 2; 21 - Part One; 22 - Part Two; 30 - Connector assembly; 301 - Input channel; 302 - Output channel; 303 - First interface; 304 - Second interface; 40 - Support component. Detailed Implementation

[0012] The technical solutions in the exemplary embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. The exemplary embodiments described herein are for illustrative purposes only and are not intended to limit the scope of protection of this application. Therefore, it should be understood that various modifications and changes can be made to the exemplary embodiments without departing from the scope of protection of this application.

[0013] In the description of this application, unless otherwise expressly specified and limited, the terms “first” and “second” are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term “multiple” refers to two or more; and the term “and / or” includes any and all combinations of one or more of the associated listed items. In particular, references to “the / described” object or “an” object are also intended to indicate one of a possible plurality of such objects.

[0014] Unless otherwise specified or stated, the terms "connection," "fixed," etc., should be interpreted broadly. 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. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0015] Furthermore, it should be understood that the directional terms such as "upper," "lower," "inner," and "outer" described in the exemplary embodiments of this application are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the exemplary embodiments of this application. It should also be understood that, in the context of an element or feature being connected to another element (one or more) "upper," "lower," "inner," or "outer," it can be directly connected to the other element (one or more) "upper," "lower," "inner," or "outer," or indirectly connected to the other element (one or more) "upper," "lower," "inner," or "outer" through an intermediate element.

[0016] Figure 1 This is a schematic diagram of a hot pressing roller device for pressing electrode sheets according to an embodiment of this application. Figure 2 for Figure 1 A partial schematic diagram of the hot press roller device is shown, as follows: Figure 1 and Figure 2 As shown, in some embodiments, the hot press roller device includes a hot press roller 10, an input pipe 20, and a connector assembly 30. Specifically, the hot press roller 10 has a heating channel 101, which extends along the central axis of the hot press roller 10. When specifically configuring the heating channel 101, the length of the heating channel 101 along the aforementioned central axis is less than the length of the hot press roller 10 along that direction. The hot press roller 10 has a third end face and a fourth end face, located at opposite ends of the hot press roller 10 in that direction. One end of the heating channel 101 penetrates the third end face of the hot press roller 10, and the other end of the heating channel 101 has a predetermined distance from the fourth end face of the hot press roller 10.

[0017] An inlet pipe 20 is inserted into a heating channel 101 and extends from one end of the heating channel 101 to the other end. The wall of the inlet pipe 20 has at least one outlet 201, which communicates with the heating channel 101 and is used to deliver a heat-conducting medium into the heating channel 101.

[0018] The connector assembly 30 is connected to the hot press roller 10 and is located at the end of the hot press roller 10. Optionally, the connector assembly 30 and the hot press roller 10 are connected by a flange. The connector assembly 30 has an input channel 301 and an output channel 302, which are not interconnected. 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 the 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 from the heating channel 101.

[0019] In order to improve the sealing effect between the joint assembly 30 and the hot press roller 10, in one embodiment, a sealing element is provided between the joint assembly 30 and the hot press roller 10. The sealing element 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.

[0020] During operation, the heat-conducting medium enters the heating channel 101 sequentially through the input channel 301 and the input pipe 20 of the aforementioned hot press roller device. Within the heating channel 101, heat exchange occurs between the heat-conducting medium and the hot press roller 10, causing the surface temperature of the hot press roller 10 to rise. After releasing heat within the heating channel 101, the temperature of the heat-conducting medium decreases, and it then flows out through the output channel 302. Within the heating channel 101, the heat-conducting medium surrounds the input pipe 20, and the flow direction of the heat-conducting medium within the heating channel 101 is opposite to its flow direction within the input pipe 20. Therefore, the heat-conducting medium within the heating channel 101 undergoes counter-current heat exchange with the heat-conducting medium in the input pipe 20 during its flow, allowing the heat-conducting medium in the heating channel 101 to absorb some heat during its return flow. This reduces the temperature difference between the heat-conducting medium at both ends of the heating channel 101, resulting in a more uniform temperature of the heat-conducting medium within the heating channel 101.

[0021] Within the heating channel 101, the heat carried by the heat-conducting medium is conducted from the center of the hot press roller 10 to the roller surface. When the temperature of the heat-conducting medium is relatively uniform, the roller surface of the hot press roller 10 is also heated relatively uniformly, thereby reducing the temperature difference between different areas of the roller surface. This improves the rolling effect of the electrode during the electrode manufacturing process and ensures the performance of the electrode.

[0022] Furthermore, in the aforementioned hot press roller device, the hot press roller 10 adopts a large-diameter single-hole design (heating channel 101), thereby reducing the number of machining holes, simplifying the structure of the hot press roller 10, and reducing the machining difficulty of the hot press roller 10. Moreover, the heat transfer medium can flow in from one end of the hot press roller 10 and out from the same end, thereby shortening the transmission pipeline located outside the hot press roller 10, reducing heat loss of the heat transfer medium during its flow within the transmission pipeline, and improving the heating effect of the heat transfer medium.

[0023] Figure 3 This is a schematic diagram of a hot press roller provided in an embodiment of this application, as shown below. Figure 3 As shown, in one embodiment, the hot press roller 10 includes a working roller section 102 and a first roller section 103. The working roller section 102 is used to roll the electrode sheet, and the working roller section 102 is located between the connector assembly 30 and the first roller section 103. Alternatively, the first roller section 103 is located at the end of the working roller section 102 away from the connector assembly 30. When a heating channel 101 is provided in the hot press roller 10, the heating channel 101 extends through the working roller section 102, and the end of the heating channel 101 away from the connector assembly 30 is located within the first roller section 103.

[0024] In the aforementioned hot press roller 10, since the heating channel 101 penetrates through the working roller section 102, the heat carried by the heat-conducting medium within the working roller section 102 can be conducted radially from the center of the working roller section 102 to the roller surface, reducing the temperature difference between the two ends of the roller surface and improving the uniformity of the temperature distribution on the roller surface. Furthermore, the heat-conducting medium can flow into the interior of the first roller section 103, causing the temperature of the first roller section 103 to rise, thereby reducing the temperature difference between the first roller section 103 and the working roller section 102. This reduces the heat conduction from the working roller section 102 to the first roller section 103, resulting in a smaller temperature difference between the end of the working roller section 102 near the first roller section 103 and the middle of the working roller section 102, thus improving the uniformity of the temperature distribution.

[0025] like Figure 3 As shown, in one embodiment, the working roller section 102 has a first end face 1021, which is located at the end of the working roller section 102 facing the first roller section 103. If the maximum distance between the first end face 1021 and the end face of the heating channel 101 away from the connector assembly 30 is represented by d1, then when d1 is large, the length of the heating channel 101 will be longer, resulting in more heat-conducting medium within the heating channel 101, thus wasting heat. When d1 is small, the length of the heating channel 101 extending beyond the first end face 1021 is smaller, and the heat diffusion of the heat-conducting medium at the end of the heating channel 101 away from the connector assembly 30 will reduce the heat absorption rate of the portion of the working roller section 102 near the first end face 1021.

[0026] In view of the above, 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 ​​that satisfy the above formula, which are not listed here. When the value of d1 satisfies the above range, the heating channel 101 can have a suitable length, thereby reducing heat waste and ensuring the heat absorption effect of the part of the working roller section 102 near the first end face 1021.

[0027] It is worth noting that the end face of the heating channel 101 away from the connector assembly 30 can be a plane, a conical surface, or other curved surfaces. When the end face of the heating channel 101 away from the connector assembly 30 is a plane, the aforementioned d1 is the distance between the first end face 1021 and that end face. When the end face of the heating channel 101 away from the connector assembly 30 is a conical surface, the aforementioned d1 is the distance between the first end face 1021 and the vertex of the conical surface.

[0028] Please continue to refer to this. Figure 3In one embodiment, the hot press roller 10 further includes a second roller segment 104, which is located at the end of the working roller segment 102 near 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 closer to the joint assembly 30, and the first roller segment 103 is farther 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. However, the diameters of the first roller segment 103 and the second roller segment 104 may be equal or unequal.

[0029] In the above-mentioned hot press roller 10, a heating channel 101 is provided inside the hot press roller 10. The heating channel 101 passes through the second roller section 104 and the working roller section 102, and the end of the heating channel 101 away from the joint assembly 30 is located in the first roller section 103.

[0030] Please continue to refer to this. Figure 3 Let D1 represent the diameter of the working roller section 102 and D2 represent the diameter of the heating channel 101. When the value of D2 / D1 is large, it will affect the structural strength of the hot press roller 10, making it prone to deformation under greater pressure. When the value of D2 / D1 is small, the distance between the roller surface of the working roller section 102 and the inner wall of the heating channel 101 is large in the radial direction, resulting in a longer heat conduction path, greater heat loss, and affecting the temperature of the working roller surface.

[0031] In view of the above, 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 ​​that satisfy the above formula, which are not listed here. When the value of D2 / D1 satisfies the above range, the structural strength of the working roller section 102 can be guaranteed, allowing the working roller section 102 to withstand greater pressure, while also ensuring the heating effect of the heat-conducting medium on the roller surface and reducing heat loss.

[0032] When specifically configuring input tube 20, such as Figure 1 As shown, d2 represents the maximum distance between the end of the input pipe 20 furthest from the connector assembly 30 and the end face of the heating channel 101 furthest from the connector assembly 30. When the value of d2 is large, a circulation dead zone is easily formed at the end of the heating channel 101 furthest from the connector assembly 30, thus 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 furthest from the connector assembly 30 prone to bending deformation.

[0033] In view of the above, 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 will not be listed in this application. When the value of d2 meets the above range, it can reduce the risk of forming a circulation dead zone at the end of the heating channel 101 away from the connector assembly 30, promote the circulation of the heat transfer medium in the heating channel 101, and reduce the length of the input pipe 20 extending into the heating channel 101, thereby reducing the risk of deformation of the input pipe 20.

[0034] It is worth noting that the end face of the heating channel 101 away from the connector assembly 30 can be a plane, a conical surface, or other curved surfaces. When the end face of the heating channel 101 away from the connector assembly 30 is a plane, the aforementioned d2 is the distance between the end of the input pipe 20 away from the connector assembly 30 and that end face. When the end face of the heating channel 101 away from the connector assembly 30 is a conical surface, the aforementioned d2 is the distance between the end of the input pipe 20 away from the connector assembly 30 and the apex of the conical surface.

[0035] If the first end face 1021 of the working roller section 102 is taken 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 connector assembly 30, or a part of the input pipe 20 is located on the side of the plane where the first end face 1021 is located facing the connector assembly 30, and another part is located on the side of the plane where the first end face 1021 is located away from the connector assembly 30.

[0036] To improve the heat exchange effect between the heat-conducting medium in the inlet pipe 20 and the heat-conducting medium in the heating channel 101, in one embodiment, the inlet pipe 20 can be a metal pipe. In addition to having good thermal conductivity, metal pipes also have high rigidity and are not easily bent or deformed.

[0037] like Figure 1 and Figure 2 As shown, in one embodiment, the input pipe 20 includes a first portion 21 and a second portion 22, which are arranged along the extension direction of the central axis of the hot press roller 10. The first portion 21 is located within the heating channel 101, and the second portion 22 is located within the output channel 302. During circulation, the higher-temperature heat transfer medium sequentially enters the heating channel 101 through the second portion 22 and the first portion 21 of the input pipe 20. After heat exchange with the hot press roller 10 within the heating channel 101, the heat transfer medium flows out through the output channel 302.

[0038] To reduce heat exchange between the heat-conducting medium flowing in the output channel 302 and the heat-conducting medium in the second part 22 of the input pipe 20, in one embodiment, the sidewall of the second part 22 has a heat insulation layer. The heat insulation layer insulates the heat-conducting medium in the second part 22, reducing 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, reducing heat exchange between the inlet and outlet ends, thereby ensuring that the heat-conducting medium entering the heating channel 101 has a higher temperature.

[0039] In one specific embodiment, the input pipe 20 is a straight pipe, and the end of the second part 22 of the input pipe 20 away from the first part 21 is connected to the input channel 301 in the connector assembly 30. The input pipe 20 generates less 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 press roller 10.

[0040] When an outlet 201 is provided on the wall of the inlet pipe 20, such as Figure 1 As shown, in one embodiment, the wall of the input pipe 20 has multiple outlets 201, and at least some of these outlets 201 are spaced apart along the length of the input pipe 20. That is, outlets 201 are provided at different positions along the length of the input pipe 20. These multiple outlets 201 are all located in the portion of the input pipe 20 that extends into the heating channel 101. These outlets 201 can replenish high-temperature heat-conducting medium to different positions in the heating channel 101, thereby reducing the temperature difference of the heat-conducting medium in different areas of the heating channel 101 and making the temperature distribution of the heat-conducting medium more uniform. This results in more uniform heating of the roller surface of the hot press roller 10, further improving the rolling effect of the hot press roller 10. Furthermore, during the recirculation process, the heat-conducting medium in the heating channel 101 can merge with the heat-conducting medium flowing out of the multiple outlets 201, replenishing the heat lost during the recirculation process. This reduces the temperature difference of the heat-conducting medium in different areas of the heating channel 101 and improves the uniformity of temperature distribution.

[0041] When arranging the aforementioned plurality of outlets 201, there are various arrangement methods. In one embodiment, the plurality of outlets 201 are arranged sequentially at intervals along the length direction of the inlet pipe 20. In another embodiment, such as... Figure 1 As shown, the plurality of outlets 201 include at least two first outlets 201a, which are located on the sidewall of the inlet pipe 20 and are distributed circumferentially. During operation, the heat-conducting medium can be sprayed out through the first outlets 201a toward the periphery of the heating channel 101, thereby improving the uniformity of the heat-conducting medium distribution and correspondingly improving the uniformity of the roller surface temperature.

[0042] In one specific embodiment, the sidewall of the input pipe 20 has multiple sets of the aforementioned first outlets 201a, and the multiple sets of the aforementioned first outlets 201a are arranged at intervals along the length direction of the input pipe 20. Each set includes at least two first outlets 201a, and the at least two first outlets 201a are distributed circumferentially.

[0043] Please continue to refer to this. Figure 1 In addition to the first outlet 201a, the plurality of outlets 201 also include at least one second outlet 201b, which is located on the end wall of the input pipe 20 away from the joint assembly 30. During operation, the heat transfer medium of the hot press roller 10 can be sprayed into the end of the heating channel 101 away from the joint assembly 30 through the at least one second outlet 201b. This can replenish the heat transfer medium at the end of the heating channel 101 away from the joint assembly 30 and accelerate the circulation of the heat transfer medium at the end of the heating channel 101 away from the joint assembly 30, thereby improving the heating effect of the heat transfer medium.

[0044] To reduce bending deformation of the portion of the input pipe 20 that extends into the heating channel 101, such as... Figure 1 As shown, in one embodiment, a support member 40 is provided between the end of the input pipe 20 away from the connector assembly 30 and the inner wall of the heating channel 101. The support member 40 can provide support for the end of the input pipe 20 away from the connector assembly 30, reducing the risk of bending deformation at that end. Optionally, the support member 40 and the input pipe 20 are bonded and fixed, and the support member 40 is also bonded and fixed to the inner wall of the heating channel 101.

[0045] When specifically setting the support member 40, the support member 40 includes various structural forms. For example... Figure 4 As shown, in one embodiment, the orthographic projection of the support member 40 onto a plane perpendicular to the central axis of the heating channel 101 covers a portion of the area between the orthographic projections of the input pipe 20 and the heating channel 101 onto the same plane. The area between the orthographic projections of the input pipe 20 and the heating channel 101 onto the same plane is an annular region. The orthographic projection of the support member 40 onto the same plane only covers a portion of this annular region, not the entire annular region. In other words, the spaces on both sides of the heating channel 101 located on the support member 40 are connected. After the heat-conducting medium is ejected from the input pipe 20, it can flow towards the side of the support member 40 away from the connector assembly 30, thereby allowing the entire heating channel 101 to be filled with the heat-conducting medium.

[0046] In another embodiment, the support member 40 can be a ring-shaped structure, and the orthographic projection of the support member 40 onto 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 onto the aforementioned plane and the orthographic projection of the heating channel 101 onto the aforementioned plane. The support member 40 can improve the support effect of the input pipe 20 and enhance its stability.

[0047] When specifically configuring connector assembly 30, such as Figure 2 As shown, in one embodiment, the surface of the connector assembly 30 has a first interface 303 and a second interface 304, which are used to communicate with external pipelines. The first interface 303 communicates with the input channel 301, and the second interface 304 communicates with the output channel 302. The first interface 303 is located at the end of the second interface 304 furthest from the hot press roller 10. Compared to the first interface 303, the second interface 304 is closer to the hot press roller 10, thereby enabling faster extraction of the heat-conducting medium from inside the hot press roller 10 for heating the medium and improving its circulation efficiency.

[0048] Please continue to refer to this. Figure 2 In the specific configuration of the output channel 302, the output channel 302 includes a first sub-channel 3021 and a second sub-channel 3022. The first sub-channel 3021 is arranged along the extension direction of the central axis of the hot press roller 10, and the second part 22 of the input tube 20 is located inside the first sub-channel 3021. The second sub-channel 3022 is located on 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, while 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 tube 20, and the other end of the input channel 301 is connected to the first interface 303.

[0049] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A hot pressing roller device for pressing electrode sheets, characterized in that, Includes hot press rollers, input pipes, and connector assemblies; The hot press roller is provided with a heating channel, which extends along the central axis of the hot press 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 deliver a heat-conducting medium into the heating channel; The connector assembly is connected to the hot press roller. The connector 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 is used to deliver a heat-conducting medium into the input pipe. The output channel is connected to the heating channel and is used to output the heat-conducting medium in the heating channel. The hot press roller includes a working roller section with a diameter of D1 and a heating channel with a diameter of D2. The diameters of D1 and D2 satisfy the following formula: 0.3≤D2 / D1≤0.

35.

2. The hot pressing roller device for pressing electrode sheets as described in claim 1, characterized in that, The input tube includes a first part and a second part, which are arranged along the extension direction of the central axis of the hot press roller; The first part is located within the heating channel, the second part is located within the output channel, and the sidewall of the second part has a heat insulation layer.

3. The hot pressing roller device for pressing electrode sheets as described in claim 1, characterized in that, The hot pressing roller includes a working roller section and a first roller section. The working roller section is used to roll and press the electrode sheet, and the first roller section is located at the end of the working roller section away from the joint assembly. The heating channel extends through the working roller section, and the end of the heating channel away from the joint assembly is located within the first roller section.

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

5. The hot pressing roller device for pressing electrode sheets as described in claim 3, characterized in that, The hot press roller further includes a second roller section, which is located at one end of the working roller section near the joint assembly; The diameters of the first roller segment and the second roller segment are both smaller than the diameter of the working roller segment.

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

7. The hot pressing roller device for pressing electrode sheets as described in any one of claims 1 to 5, characterized in that, The surface of the connector assembly has a first interface and a second interface, which 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 the end of the second interface away from the hot press roller.

8. The hot pressing roller device for pressing electrode sheets as described in any one of claims 1 to 5, characterized in that, The wall of the input pipe has a plurality of outlets, and at least some of the outlets are spaced apart along the length of the input pipe.

9. The hot pressing roller device for pressing electrode sheets as described in claim 8, characterized in that, The plurality of outlets includes at least two first outlets located on the sidewall of the inlet pipe and arranged circumferentially.

10. The hot pressing roller device for pressing electrode sheets as described in claim 8, characterized in that, The plurality of outlets includes at least one second outlet, the at least one second outlet being located on the end wall of the inlet pipe away from the connector assembly.

11. The hot pressing roller device for pressing electrode sheets as described in any one of claims 1 to 5, characterized in that, A support is provided between the end of the input pipe away from the connector assembly and the inner wall of the heating channel.

12. The hot pressing roller device for pressing electrode sheets as described in claim 11, characterized in that, The orthographic projection of the support member onto a plane perpendicular to the central axis of the heating channel covers a portion of the area between the orthographic projection of the input pipe onto the plane and the orthographic projection of the heating channel onto the plane.

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