Pole piece press roller

Abstract

The application belongs to the technical field of lithium ion battery preparation, and provides an electrode sheet pressing roller. The electrode sheet pressing roller comprises a pressing roller body and roller heads, the roller heads are arranged at two ends of the pressing roller body along the axial direction of the electrode sheet pressing roller, the roller heads are detachably connected with the pressing roller body, the surface of the roller head is an arc surface extending along the axial direction of the electrode sheet pressing roller; the pressing roller body is provided with a first limiting piece, the roller head is provided with a second limiting piece, the first limiting piece and the second limiting piece both extend along the axial direction of the electrode sheet pressing roller, the first limiting piece and the second limiting piece abut each other to prevent the pressing roller body and the roller head from relatively rotating around the axial direction of the electrode sheet pressing roller. When the electrode sheet is manufactured by using the electrode sheet pressing roller provided in the application, the manufacturing cost of the electrode sheet can be reduced.

Description

Technical Field

[0001] This application relates to the field of lithium-ion battery manufacturing technology, and in particular to an electrode pressure roller. Background Technology

[0002] Lithium-ion batteries have advantages such as high energy density, good cycle life, low self-discharge, and fast charging and discharging speed, and are widely used in energy storage, consumer electronics, aerospace, transportation and other fields.

[0003] Lithium-ion batteries consist of electrodes. During electrode fabrication, a mixture of active material and various additives is first coated onto a metal substrate. Then, the metal substrate and active material layer are pressed together using pressure rollers. During this pressing process, the electrode's edge thickness is often less than its center thickness. Therefore, the ends of the pressure rollers are typically designed with curved surfaces to mitigate this issue. However, the required curvature of the curved surfaces at the ends of the pressure rollers varies depending on the electrode thickness.

[0004] The cost of manufacturing electrodes using electrode rollers with relevant technologies is relatively high. Summary of the Invention

[0005] This application provides an electrode pressure roller, which can reduce the manufacturing cost of electrodes when used to manufacture electrodes.

[0006] This application provides an electrode pressure roller, including a pressure roller body and a roller head. The roller head is disposed at both ends of the pressure roller body along the axial direction of the electrode pressure roller. The roller head is detachably connected to the pressure roller body. The surface of the roller head is an arc surface extending along the axial direction of the electrode pressure roller.

[0007] The pressure roller body has a first limiting member and the roller head has a second limiting member. Both the first and second limiting members extend along the axial direction of the electrode pressure roller. The first limiting member abuts against the second limiting member to prevent the pressure roller body and the roller head from rotating relative to each other around the axial direction of the electrode pressure roller.

[0008] In one possible implementation, the electrode pressure roller provided in this application embodiment includes a first limiting member comprising a plurality of first baffles and a second limiting member comprising a plurality of second baffles. The plurality of first baffles and the plurality of second baffles are arranged alternately along the circumference of the electrode pressure roller, and each first baffle abuts against the second baffle adjacent to it.

[0009] In one possible implementation, the electrode roller provided in this application has a V-shaped cross-section for both the first baffle and the second baffle along the radial direction of the electrode roller.

[0010] In one possible implementation, the electrode pressure roller provided in this application embodiment has a protrusion on the roller body, a plurality of first baffles are spaced apart on the protrusion, a recess is provided at one end of the roller head facing the roller body, a plurality of second baffles are spaced apart on the recess, and the protrusion and the recess are inserted into each other.

[0011] In one possible implementation, the electrode pressure roller provided in this application embodiment has a first mounting hole on the roller body and a second mounting hole on the roller head. The electrode pressure roller also includes fasteners that pass through the first mounting hole and the second mounting hole to connect the roller body and the roller head.

[0012] In one possible implementation, the electrode roller provided in this application embodiment has a plurality of first mounting holes, which are arranged at intervals on the roller body along the circumference of the electrode roller, and a plurality of second mounting holes, which are aligned one by one with the first mounting holes.

[0013] In one possible implementation, the electrode pressure roller provided in this application embodiment has a flange on the roller body, and a stepped portion opposite to the flange at one end of the roller head facing the roller body, with the flange sleeved on the stepped portion;

[0014] The diameter of the end of the roller head facing the pressure roller body is equal to the diameter of the flange, so that the surface of the roller head and the surface of the pressure roller body can smoothly transition.

[0015] In one possible implementation, the diameter of the end of the roller head facing the roller body is larger than the diameter of the end of the roller head away from the roller body in the embodiment of this application.

[0016] In one possible implementation, the diameter of the electrode pressure roller body provided in this application gradually decreases from the middle to both ends along the axial direction of the electrode pressure roller.

[0017] In one possible implementation, the electrode pressure roller provided in this application embodiment further includes a rotating shaft connected to the roller head.

[0018] This application provides an electrode pressing roller, which consists of a roller body and roller heads. The roller heads are located at both ends of the roller body and are detachably connected to the roller body. The surface of the roller head is an arc surface extending axially along the electrode pressing roller. The roller body has a first limiting member, and the roller head has a second limiting member. Both the first and second limiting members extend axially along the electrode pressing roller, and the first and second limiting members abut against each other to prevent the roller body and roller head from rotating relative to each other around the axial direction of the electrode pressing roller. By configuring the electrode pressing roller as a detachably connected roller body and roller head, and by limiting the roller body and roller head circumferentially through the first and second limiting members, and by making the roller body and roller head detachably connected, the connection between the roller body and roller head is reliable and easy to assemble and disassemble. When it is necessary to produce electrodes of different thicknesses, only roller heads with different arc surfaces need to be replaced. Compared with related technologies that require multiple electrode pressing rollers to produce electrodes of different thicknesses, this reduces the cost of the electrode manufacturing process. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of the electrode roller provided in the embodiments of this application;

[0021] Figure 2 This is a front view of the electrode roller provided in an embodiment of this application;

[0022] Figure 3 A schematic diagram of the structure of the pressure roller body in the electrode pressure roller provided in the embodiments of this application. Figure 1 ;

[0023] Figure 4 A schematic diagram of the roller head structure in the electrode pressure roller provided in the embodiments of this application. Figure 1 ;

[0024] Figure 5 A schematic diagram of the structure of the pressure roller body in the electrode pressure roller provided in the embodiments of this application. Figure 2 ;

[0025] Figure 6 A schematic diagram of the roller head structure in the electrode pressure roller provided in the embodiments of this application. Figure 2 .

[0026] Explanation of reference numerals in the attached figures:

[0027] 100-Electrode pressure roller;

[0028] 110-Press roller body;

[0029] 111-First limiting component; 1111-Arm portion; 1112-First baffle; 1113-First gap;

[0030] 112 - Protrusion;

[0031] 113 - First mounting hole;

[0032] 114 - Flange;

[0033] 120 - Roller head; 120a - First end face; 120b - Second end face;

[0034] 121-Second limiting component; 1211-Slot; 1212-Second baffle; 1213-Second gap;

[0035] 122-recess;

[0036] 123 - Second mounting hole;

[0037] 124 - Step section;

[0038] 130 - Fasteners;

[0039] 140-shaft;

[0040] C-Zhou Xiang;

[0041] L - Axial direction;

[0042] R - Radial;

[0043] D1 - First diameter;

[0044] D2 - Second diameter;

[0045] D3-third diameter;

[0046] D4 - Fourth diameter. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0048] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an indirect connection through an intermediate medium, or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0049] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0050] The terms "first," "second," and "third" (if any) in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a particular order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein.

[0051] Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion, such as a process, method, system, product, or maintenance tool that includes a series of steps or units, not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or maintenance tool.

[0052] Lithium-ion batteries have advantages such as high energy density, good cycle life, low self-discharge, and fast charging and discharging speed, and are widely used in energy storage, consumer electronics, aerospace, transportation and other fields.

[0053] A lithium-ion battery consists of electrodes and a separator. The electrodes include positive and negative electrodes, which are stacked and wound together to form the lithium-ion battery. The electrodes are a crucial component of a lithium-ion battery, and their thickness significantly affects the overall thickness and energy density of the battery.

[0054] An electrode consists of a metal substrate and an active material layer. During electrode fabrication, a mixture of active material and various additives is first coated onto the metal substrate. Then, the substrate and active material layer are pressed together using pressure rollers. This pressing process makes the electrode structure more stable, reducing the gaps between particles in the active material layer and between the active material layer and the metal substrate. This improves the bonding strength between the metal substrate and the active material layer and reduces the ion transport distance.

[0055] When the active material layer and the substrate are pressed together by pressure rollers, the electrode may exhibit a phenomenon where the edge thickness is less than the center thickness. In related technologies, the two ends of the pressure roller are typically designed with curved surfaces. These curved surfaces can compensate for the difference in thickness between the edge and center of the electrode, thus improving the problem of the edge thickness being less than the center thickness during pressing. However, the thickness of the electrodes used in different lithium-ion batteries varies, therefore the difference between the center and edge thickness also varies, resulting in different requirements for the curvature of the curved surfaces at both ends of the pressure roller. When preparing electrodes of different thicknesses, different pressure rollers need to be used, requiring multiple pressure rollers for replacement during electrode production, thus increasing the cost of electrode manufacturing.

[0056] Based on this, this application provides an electrode pressure roller. When manufacturing electrodes using the electrode pressure roller provided in the embodiments of this application, the manufacturing cost of the electrodes can be reduced.

[0057] Figure 1 This is a schematic diagram of the structure of the electrode roller provided in the embodiments of this application; Figure 2 This is a front view of the electrode roller provided in an embodiment of this application; Figure 3 A schematic diagram of the structure of the pressure roller body in the electrode pressure roller provided in the embodiments of this application. Figure 1 ; Figure 4 A schematic diagram of the roller head structure in the electrode pressure roller provided in the embodiments of this application. Figure 1 .

[0058] See Figures 1 to 4 As shown, the electrode pressure roller 100 includes a pressure roller body 110 and a roller head 120. The roller head 120 is disposed at both ends of the pressure roller body 110 along the axial direction L of the electrode pressure roller 100. The roller head 120 is detachably connected to the pressure roller body 110. The surface of the roller head 120 is an arc surface extending along the axial direction L of the electrode pressure roller 100. The pressure roller body 110 has a first limiting member 111, and the roller head 120 has a second limiting member 121. Both the first limiting member 111 and the second limiting member 121 extend along the axial direction L of the electrode pressure roller 100. The first limiting member 111 abuts against the second limiting member 121 to prevent the pressure roller body 110 and the roller head 120 from rotating relative to each other around the axial direction L of the electrode pressure roller 100.

[0059] The electrode pressing roller 100 has an overall cylindrical structure and includes an axial direction L, a circumferential direction C, and a radial direction R. The roller body 110 extends along the axial direction L, and roller heads 120 are provided at both ends of the roller body 110 along the axial direction L. When pressing the electrode, the roller body 110 contacts the middle part of the electrode, and the roller head 120 contacts the edge part of the electrode. The surface of the roller head 120 is arc-shaped, which can compensate for the difference between the thickness of the edge and the thickness of the middle part of the electrode when pressing the electrode.

[0060] The specific connection method between the roller head 120 and the pressure roller body 110 will be described below.

[0061] Please continue reading Figure 1 , Figure 3 and Figure 4 As shown, the end of the roller head 120 facing the pressure roller body 110 is the first end face 120a, and the end face 120b opposite to the first end face 120a along the axial direction L is the second end face 120b.

[0062] The pressure roller body 110 has a first limiting member 111, in Figure 3 In the illustrated embodiment, the pressure roller body 110 has a first limiting member 111, which can be an arm 1111 extending along the axial direction L. The roller head 120 has a second limiting member 121 on its first end face 120a. Figure 4 In the illustrated embodiment, the second limiting member 121 can be a slot 1211 extending along the axial direction L. When connecting the roller head 120 and the pressure roller body 110, the first end face 120a of the roller head 120 is aligned with the end of the pressure roller body 110, such that the arm portion 1111 and the arm slot 1211 are aligned. The arm portion 1111 is inserted into the slot 1211, and the arm portion 1111 abuts against the inner wall of the slot 1211. This prevents the roller head 120 from rotating relative to the pressure roller body 110 about the axial direction L. In other embodiments, the first limiting member 111 and the second limiting member 121 can be a matching hook and a buckle, as long as the first limiting member 111 and the second limiting member 121 can prevent the roller head 120 from rotating relative to the pressure roller body 110 about the axial direction L.

[0063] By setting a first limiting member 111 on the pressure roller body 110 and a second limiting member 121 on the roller head 120, and making the first limiting member 111 and the second limiting member 121 abut against each other, the roller head 120 and the pressure roller body 110 can be limited along the circumferential direction C, making the limiting method of the roller head 120 and the pressure roller body 110 simple.

[0064] In this embodiment of the application, the roller head 120 can be connected to the pressure roller body 110 by fasteners, so that the roller head 120 can be reliably fixed on the pressure roller body 110, and the disassembly and assembly of the roller head 120 and the pressure roller body 110 are simple.

[0065] When pressing electrodes of different thicknesses, simply remove the fasteners and then remove the roller head 120 from the pressure roller body 110 along the axial direction L, so that the first limiting member 111 and the second limiting member 121 disengage; then make the second limiting member 121 on another roller head 120 with a curved surface that meets the production requirements abut against the first limiting member 111 on the pressure roller body 110, and then fix the roller head 120 and the pressure roller body 110 with fasteners.

[0066] The electrode pressure roller 100 provided in this embodiment of the application is provided with a pressure roller body 110 and a roller head 120. The roller head 120 is provided at both ends of the pressure roller body 110 and is detachably connected to the pressure roller body 110. The surface of the roller head 120 is an arc surface extending along the axial direction L of the electrode pressure roller 100. The pressure roller body 110 has a first limiting member 111 and the roller head 120 has a second limiting member 121. Both the first limiting member 111 and the second limiting member 121 extend along the axial direction L of the electrode pressure roller 100. The first limiting member 111 and the second limiting member 121 abut against each other to prevent the pressure roller body 110 and the roller head 120 from rotating relative to each other around the axial direction L of the electrode pressure roller 100. By configuring the electrode pressure roller 100 as a detachably connected pressure roller body 110 and roller head 120, and limiting the pressure roller body 110 and roller head 120 along the circumferential direction C by the first limiting member 111 and the second limiting member 121, and by making the pressure roller body 110 and roller head 120 detachably connected, the connection between the pressure roller body 110 and roller head 120 is reliable and easy to assemble and disassemble. When it is necessary to produce electrode sheets of different thicknesses, only the roller head 120 with different arc surfaces needs to be replaced. Compared with related technologies that require multiple electrode pressure rollers to produce electrode sheets of different thicknesses, the cost in the electrode manufacturing process can be reduced.

[0067] Figure 5 A schematic diagram of the structure of the pressure roller body in the electrode pressure roller provided in the embodiments of this application. Figure 2 ; Figure 6 A schematic diagram of the roller head structure in the electrode pressure roller provided in the embodiments of this application. Figure 2 .

[0068] See Figure 5 and Figure 6 As shown, the first limiting member 111 includes a plurality of first baffles 1112, and the second limiting member 121 includes a plurality of second baffles 1212. The plurality of first baffles 1112 and the plurality of second baffles 1212 are arranged alternately along the circumferential direction C of the electrode pressure roller 100, and each first baffle 1112 abuts against the second baffle 1212 adjacent to it.

[0069] exist Figure 5 and Figure 6In the illustrated embodiment, the first limiting member 111 includes a plurality of first baffles 1112 arranged at intervals along the circumferential direction C on the pressure roller body 110, with a first gap 1113 formed between adjacent first baffles 1112, the size of which matches the size of the second baffles 1212. The second limiting member 121 includes a plurality of second baffles 1212 arranged at intervals along the circumferential direction C on the roller head 120, with a second gap 1213 formed between adjacent second baffles 1212, the size of which matches the size of the first baffles 1112.

[0070] When the roller head 120 is installed onto the pressure roller body 110, the first baffle 1112 is aligned with the second gap 1213, and the second baffle 1212 is aligned with the first gap 1113. The first baffle 1112 is inserted into the second gap 1213, and the second baffle 1212 is inserted into the first gap 1113. Thus, multiple first baffles 1112 and multiple second baffles 1212 are staggered along the circumferential direction C of the electrode pressure roller 100, and each first baffle 1112 abuts against the second baffle 1212 adjacent to it.

[0071] With this configuration, when one of the first baffles 1112 or the second baffle 1212 wears out, the other first baffles 1112 and the second baffle 1212 can still limit the roller head 120 and the pressure roller body 110 along the circumferential direction C, making the limiting of the roller head 120 and the pressure roller body 110 more reliable.

[0072] See Figure 5 and Figure 6 As shown, the cross-sections of the first baffle 1112 and the second baffle 1212 along the radial direction R of the electrode pressure roller 100 are both V-shaped.

[0073] Setting the cross-section of the first baffle 1112 and the second baffle 1212 to V-shape facilitates the insertion of the first baffle 1112 into the second gap 1213 and the insertion of the second baffle 1212 into the first gap 1113.

[0074] Please continue reading Figures 3 to 6 As shown, the pressure roller body 110 has a protrusion 112, and a plurality of first baffles 1112 are spaced apart on the protrusion 112. The roller head 120 has a recess 122 at one end facing the pressure roller body 110, and a plurality of second baffles 1212 are spaced apart on the recess 122. The protrusion 112 and the recess 122 are inserted into each other.

[0075] The protrusion 112 is a boss protruding from the end face of the pressure roller body 110. The protrusion 112 can be coaxially arranged with the pressure roller body 110. The recess 122 is a groove recessed from the first end face 120a of the roller head 120. The recess 122 can be coaxially arranged with the roller head 120.

[0076] The first baffle 1112 is disposed on the protrusion 112, and the second baffle 1212 is disposed on the recess 122. When the roller head 120 is installed onto the pressure roller body 110, the protrusion 112 is inserted into the recess 122, so that the first baffle 1112 and the second baffle 1212 abut against each other. That is to say, the circumferential C-direction limitation of the roller head 120 and the pressure roller body 110 does not occupy the axial L space, making the structure of the electrode pressure roller 100 more compact.

[0077] The following describes the method of fixing the roller head 120 and the pressure roller body 110.

[0078] Please continue reading Figure 1 , Figures 3 to 6 As shown, the pressure roller body 110 has a first mounting hole 113, and the roller head 120 has a second mounting hole 123. The electrode pressure roller 100 also includes a fastener 130, which passes through the first mounting hole 113 and the second mounting hole 123 to connect the pressure roller body 110 and the roller head 120.

[0079] The first mounting hole 113 can be a threaded hole, the second mounting hole 123 can be a through hole, and the fastener 130 can be a stud. The fastener 130 passes through the second mounting hole 123 and the first mounting hole 113 and is threadedly connected to the first mounting hole 113, so that the roller head 120 can be installed on the pressure roller body 110.

[0080] Please continue reading Figure 1 , Figures 3 to 6 As shown, there are multiple first mounting holes 113, which are arranged at intervals along the circumferential direction C of the electrode pressure roller 100 on the pressure roller body 110. There are multiple second mounting holes 123, which are aligned one by one with the first mounting holes 113.

[0081] exist Figure 1 , Figures 3 to 6 In the embodiment shown, there are four first mounting holes 113, which are evenly spaced along the circumferential direction C on the pressure roller body 110. The number of second mounting holes 123 is the same as the number of first mounting holes 113.

[0082] Align the second mounting hole 123 with the first mounting hole 113 one by one, and fasteners 130 are respectively inserted into the first mounting hole 113 and the second mounting hole 123 to connect the roller head 120 and the pressure roller body 110. By providing multiple first mounting holes 113 and matching second mounting holes 123 and fasteners 130, the roller head 120 can be reliably installed on the pressure roller body 110, and the roller head 120 and the pressure roller body 110 can be further limited along the circumferential direction C.

[0083] Please continue reading Figures 3 to 6 As shown, the pressure roller body 110 has a flange 114, and the roller head 120 has a stepped portion 124 opposite to the flange 114 at one end facing the pressure roller body 110. The flange 114 is sleeved on the stepped portion 124. The diameter of the end of the roller head 120 facing the pressure roller body 110 is equal to the diameter of the flange 114, so that the surface of the roller head 120 and the surface of the pressure roller body 110 transition smoothly.

[0084] Specifically, the flange 114 extends from the end face of the pressure roller body 110, and the stepped portion 124 extends from the first end face 120a of the roller head 120. When the roller head 120 is connected to the pressure roller body 110, the flange 114 is fitted onto the stepped portion 124.

[0085] The outer diameter of the flange 114 is the first diameter D1, and the diameter of the roller head 120 near the first end face 120a is the second diameter D2. The first diameter D1 is equal to the second diameter D2. Thus, the electrode pressure roller 100 can maintain a smooth connection between the pressure roller body 110 and the roller head 120, and can avoid processing marks on the electrode.

[0086] Please continue reading Figure 4 As shown, the diameter of the end of the roller head 120 facing the pressure roller body 110 is larger than the diameter of the end of the roller head 120 away from the pressure roller body 110.

[0087] The diameter of the second end face 120b of the roller head 120 is the third diameter D3, which is smaller than the second diameter D2. Thus, an arc surface can be formed on the roller head 120.

[0088] Please continue reading Figure 2 As shown, the diameter of the pressure roller body 110 gradually decreases from the middle to both ends along the axial direction L of the electrode pressure roller 100.

[0089] The diameter of the middle region of the pressure roller body 110 along the axial direction L is the fourth diameter D4. The fourth diameter D4 is larger than the first diameter D1. That is to say, in this embodiment, the pressure roller body 110 is a column that is large in the middle and small at both ends, so that the surface of the pressure roller body 110 is also an arc surface.

[0090] In related technologies, the electrode pressing roller is a cylinder. During the pressing of the electrode by the electrode pressing roller, the thickness of the electrode gradually decreases from the middle area to the edge area. Therefore, the surface of the pressing roller body 110 is also set as an arc surface, so that the thickness of the electrode is uniform throughout the entire range during the pressing process.

[0091] Please continue reading Figures 1 to 6 As shown, the electrode pressure roller 100 also includes a rotating shaft 140, which is connected to the roller head 120.

[0092] The rotating shaft 140 is coaxially connected to the roller head 120 at the second end face 120b of the roller head 120. Connecting the rotating shaft 140 to the roller head 120 avoids the rotating shaft 140 from being inserted into the pressure roller body 110, thereby simplifying the structure at the connection between the pressure roller body 110 and the roller head 120.

[0093] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. An electrode pressure roller, characterized in that, It includes a pressure roller body and a roller head. The roller head is disposed at both ends of the pressure roller body along the axial direction of the electrode pressure roller. The roller head is detachably connected to the pressure roller body. The surface of the roller head is an arc surface extending along the axial direction of the electrode pressure roller. The pressure roller body has a first limiting member, and the roller head has a second limiting member. Both the first limiting member and the second limiting member extend along the axial direction of the electrode pressure roller. The first limiting member abuts against the second limiting member to prevent the pressure roller body and the roller head from rotating relative to each other around the axial direction of the electrode pressure roller. The pressure roller body has a flange, and the end of the roller head facing the pressure roller body has a stepped portion opposite to the flange, and the flange is sleeved on the stepped portion; the diameter of the end of the roller head facing the pressure roller body is equal to the diameter of the flange, so that the surface of the roller head and the surface of the pressure roller body transition smoothly. The diameter of the end of the roller head facing the pressure roller body is greater than the diameter of the end of the roller head away from the pressure roller body; The diameter of the pressure roller body gradually decreases from the middle to both ends along the axial direction of the electrode pressure roller.

2. The electrode pressure roller according to claim 1, characterized in that, The first limiting member includes a plurality of first baffles, and the second limiting member includes a plurality of second baffles. The plurality of first baffles and the plurality of second baffles are arranged alternately along the circumference of the electrode pressure roller, and each first baffle abuts against the second baffle adjacent to it.

3. The electrode pressure roller according to claim 2, characterized in that, Both the first baffle and the second baffle have V-shaped cross-sections along the radial direction of the electrode roller.

4. The electrode pressure roller according to claim 3, characterized in that, The pressure roller body has a protrusion, and a plurality of first baffles are spaced apart on the protrusion. The end of the roller head facing the pressure roller body has a recess, and a plurality of second baffles are spaced apart on the recess. The protrusion is inserted into the recess.

5. The electrode pressure roller according to any one of claims 1 to 4, characterized in that, The pressure roller body has a first mounting hole, and the roller head has a second mounting hole. The electrode pressure roller also includes a fastener, which passes through the first mounting hole and the second mounting hole to connect the pressure roller body and the roller head.

6. The electrode pressure roller according to claim 5, characterized in that, The number of first mounting holes is multiple, and the multiple first mounting holes are arranged at intervals on the pressure roller body along the circumference of the electrode pressure roller. The number of second mounting holes is multiple, and the multiple second mounting holes are aligned with the first mounting holes one by one.

7. The electrode pressure roller according to any one of claims 1 to 4, characterized in that, The electrode pressure roller also includes a rotating shaft, which is connected to the roller head.

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