Roller press

Abstract

The utility model relates to the technical field of roller presses, in particular to a roller press, and aims to solve the problem that a ceramic material layer in an edge area of a positive pole piece cannot be well stretched. In order to achieve the purpose, the roller press comprises a first pressing roller, a second pressing roller, a third pressing roller and a fourth pressing roller, the axis of the second pressing roller is parallel to the axis of the first pressing roller, the second pressing roller comprises connecting sections and at least two second rolling cylindrical sections which are coaxial with each other, any two adjacent second rolling cylindrical sections are connected through one connecting section, and the outer diameter of each second rolling cylindrical section is larger than the maximum radial size of the cross section of the corresponding connecting section; and the second compression roller and the first compression roller are arranged oppositely, so that the second rolling cylindrical section and the first rolling cylindrical section extrude a ceramic material layer on the edge area of the pole piece penetrating through the space between the first compression roller and the second compression roller in a mode of moving oppositely. During rolling stretching, different stretching degrees of the ceramic material layer can be achieved by adjusting the distance between the first pressing roller and the second pressing roller.

Description

Technical Field

[0001] The utility model relates to the technical field of roller presses, and particularly provides a roller press. Background Art

[0002] Due to its good thermal stability and insulation, ceramic materials can be used as a protective layer for lithium-ion batteries to reduce the safety risks of batteries under extreme conditions such as high temperature, overcharge or short circuit. Generally, the positive electrode plate of a lithium-ion battery includes a metal foil. One side of the metal foil is sequentially divided into an edge area, a middle area and an edge area along its width direction. The middle area is coated with an electrode active material layer, and a part of the width area adjacent to the electrode active material layer on the edge area is coated with a ceramic material layer. The thickness of the ceramic material layer is less than that of the electrode active material layer. During the manufacturing process of the positive electrode plate, it is necessary to roll the positive electrode plate to compact the electrode active material layer on the positive electrode plate. During the rolling process, due to the extrusion of the two opposing pressure rollers, the metal foil covered by the electrode active material layer will be extended, while the ceramic material layer is not rolled by the pressure rollers, and the metal foil covered by the ceramic material layer hardly extends. A great stress will be generated at the connection part between the metal foil covered by the ceramic material layer and the metal foil covered by the electrode active material layer on the positive electrode plate, and this connection part is easily torn.

[0003] In order to avoid the above situation, usually a set of tension mechanism is configured to pre-extend the ceramic material layer on the positive electrode plate before rolling the positive electrode plate, or a set of tension mechanism is configured for post-extension after rolling the positive electrode plate. Specifically, a Teflon tape is wound around the position of the ceramic material layer on the tension roller of the tension mechanism. Under the support of the tension roller, the strip-shaped positive electrode plate travels in a tensioned state, and the ceramic material layer on the positive electrode plate is stretched by the support of the Teflon tape wound around the tension roller. However, due to the high hardness of the ceramic material, supporting the ceramic material layer on one side of the ceramic material by the Teflon tape wound around the tension roller cannot achieve a good stretching effect.

[0004] Therefore, a new technical solution is needed in the art to solve the above problems. Summary of the Utility Model

[0005] The utility model aims to solve the above technical problems, that is, to solve the problem that the ceramic material layer in the edge area of the positive electrode plate cannot be stretched well.

[0006] The present utility model provides a roll press, which includes: a first pressure roll, which includes a first roll-pressing cylindrical section; a second pressure roll, the axis of which is parallel to the axis of the first pressure roll. The second pressure roll includes a connecting section and at least two second roll-pressing cylindrical sections that are coaxial with each other. Any two adjacent second roll-pressing cylindrical sections are connected by one connecting section. The outer diameter of the second roll-pressing cylindrical section is greater than the maximum radial dimension of the cross-section of the connecting section. The second pressure roll is disposed opposite to the first pressure roll so that the second roll-pressing cylindrical section and the first roll-pressing cylindrical section squeeze the ceramic material layer on the edge area of the pole piece passing through between the first pressure roll and the second pressure roll by moving towards each other.

[0007] In a preferred technical solution of the above roll press, the second pressure roll includes a support shaft and at least two first rollers detachably sleeved on the support shaft. The first rollers and the part of the support shaft covered by the first rollers constitute the second roll-pressing cylindrical section, and the part of the support shaft not covered by the first rollers constitutes the connecting section; the second pressure roll is configured with a first locking portion, and the first locking portion is used to fix the first rollers to the support shaft.

[0008] In a preferred technical solution of the above roll press, the roll press further includes at least two second rollers, and the second rollers can replace the first rollers so that the second rollers and the part of the support shaft covered by the second rollers constitute the second roll-pressing cylindrical section, and the part of the support shaft not covered by the second rollers constitutes the connecting section; the roughness of the outer peripheral surface of the second rollers is different from that of the outer peripheral surface of the first rollers, and / or the hardness of the outer peripheral surface of the second rollers is different from that of the outer peripheral surface of the first rollers.

[0009] In a preferred technical solution of the above roll press, the outer peripheral surface of the first rollers is provided with first concave-convex textures, and the outer peripheral surface of the second rollers is provided with second concave-convex textures so that the roughness of the outer peripheral surface of the second rollers is different from that of the outer peripheral surface of the first rollers.

[0010] In a preferred technical solution of the above roll press, the first locking portion can fix the first rollers to any position of the support shaft.

[0011] In a preferred technical solution of the above roll press, the second rollers are sleeved on the support shaft, and the second pressure roll is configured with a second locking portion, and the second locking portion is used to fix the second rollers to the support shaft.

[0012] In a preferred technical solution of the above roll press, the second locking portion can fix the second rollers to any position of the support shaft.

[0013] In the preferred technical solution of the above roll press, the second roll pressing cylindrical section is provided with a first temperature increasing device for increasing the temperature of the second roll pressing cylindrical section; and / or the first roll pressing cylindrical section is provided with a second temperature increasing device for increasing the temperature of the first roll pressing cylindrical section.

[0014] In the preferred technical solution of the above roll press, a flow channel extending along its axial direction is arranged inside the support shaft. The flow channel has an inlet and an outlet. The roll press includes a heating device, and the outlet of the heating device is communicated with the inlet of the flow channel so as to introduce high-temperature fluid into the flow channel, thereby increasing the temperature of the roller sleeved on the support shaft.

[0015] In the preferred technical solution of the above roll press, the roll press includes a pressure sensor communicatively connected to the controller of the roll press. The pressure sensor is used for detecting the extrusion pressure between the first pressure roller and the second pressure roller.

[0016] In the case of adopting the above technical solution, the roll press includes: a first pressure roller including a first roll pressing cylindrical section; a second pressure roller whose axis is parallel to the axis of the first pressure roller. The second pressure roller includes a connecting section and at least two second roll pressing cylindrical sections that are coaxial with each other. Any two adjacent second roll pressing cylindrical sections are connected by a connecting section. The outer diameter of the second roll pressing cylindrical section is greater than the maximum radial dimension of the cross section of the connecting section. The second pressure roller is arranged opposite to the first pressure roller so that the second roll pressing cylindrical section and the first roll pressing cylindrical section extrude the ceramic material layer on the edge area of the pole piece passing between the first pressure roller and the second pressure roller by moving towards each other.

[0017] With such a setting, when the roll press of the present invention is used to roll and stretch the ceramic material layer in the edge area of the pole piece, the pole piece is threaded between the first pressure roller and the second pressure roller. The second roll pressing cylindrical section on the second pressure roller faces the ceramic material layer. The second roll pressing cylindrical section and the first roll pressing cylindrical section move towards each other and press the ceramic material layer on the pole piece. As the pole piece moves along its length direction, the ceramic material layers at different positions on the pole piece are successively extruded by the second roll pressing cylindrical section and the first roll pressing cylindrical section and are stretched. During the roll pressing and stretching, the different stretching degrees of the ceramic material layer can be achieved by adjusting the distance between the first pressure roller and the second pressure roller, so as to achieve the expected stretching effect and realize the good stretching of the ceramic material layer in the edge area of the pole piece.

[0018] Preferably, the second pressing roller includes a support shaft and at least two first rollers detachably sleeved on the support shaft. The part of the support shaft covered by the first rollers forms the second roller pressing cylindrical section, and the part of the support shaft not covered by the first rollers forms the connection section. The second pressing roller is configured with a first locking portion for fixing the first roller to the support shaft.

[0019] With such a setting, when the surface of the first roller is severely worn after long-term use of the roller press and cannot work properly, only by replacing the first roller can the roller press resume normal working state, reducing the maintenance cost of the roller press.

[0020] Preferably, the roller press further includes at least two second rollers that can replace the first rollers, so that the part of the support shaft covered by the second rollers forms the second roller pressing cylindrical section, and the part of the support shaft not covered by the second rollers forms the connection section. The roughness of the outer peripheral surface of the second roller is different from that of the outer peripheral surface of the first roller, and / or the hardness of the outer peripheral surface of the second roller is different from that of the outer peripheral surface of the first roller.

[0021] For different pole pieces, the ceramic material layer in the edge area may use different ceramic materials, the thickness of the ceramic material layer may be different, the hardness of the ceramic material layer may be different, and the degree of stretching required for the ceramic material layer may be different. Through the above settings, for different pole pieces, corresponding rollers can be selected according to the different ceramic material layers to roll the ceramic material layer, reducing the risk of insufficient or excessive stretching of the ceramic material layer.

[0022] Preferably, the first locking portion can fix the first roller to any position of the support shaft.

[0023] With such a setting, the first roller can be fixed to the corresponding position of the support shaft according to the position of the ceramic material layer on the pole piece, so as to meet the stretching requirements of the ceramic material layer on pole pieces of different widths.

[0024] Preferably, the second roller is sleeved on the support shaft, and the second pressing roller is configured with a second locking portion for fixing the second roller to the support shaft.

[0025] With such a setting, it is possible to conveniently replace the first roller with the second roller without removing the support shaft.

[0026] Preferably, the second locking portion can fix the second roller to any position of the support shaft.

[0027] With such a setting, the second roller can be fixed to the corresponding position of the support shaft according to the position of the ceramic material layer on the pole piece, so as to meet the stretching requirements of the ceramic material layer on pole pieces of different widths.

[0028] Preferably, the second roller pressing cylindrical section is provided with a first temperature increasing device for increasing the temperature of the second roller pressing cylindrical section; and / or the first roller pressing cylindrical section is provided with a second temperature increasing device for increasing the temperature of the first roller pressing cylindrical section.

[0029] With such an arrangement, it is possible to heat the first roller pressing cylindrical section and / or the second roller pressing cylindrical section so that the temperature of the first roller pressing cylindrical section and / or the second roller pressing cylindrical section increases, and through heat transfer, the temperature of the ceramic material layer in the edge region of the pole piece increases, making the ceramic material layer have better ductility, facilitating the stretching of the ceramic material layer, and reducing or even eliminating the internal stress of the ceramic material layer.

[0030] Preferably, a flow channel extending along the axial direction thereof is provided inside the support shaft. The flow channel has an inlet and an outlet. The roller press includes a heating device, and the outlet of the heating device is communicated with the inlet of the flow channel so as to introduce high-temperature fluid into the flow channel, thereby increasing the temperature of the roller sleeved on the support shaft.

[0031] With such an arrangement, it is possible to increase the temperature of the roller on the support shaft, and through heat transfer, the temperature of the ceramic material layer in the edge region of the pole piece increases, making the ceramic material layer have better ductility, facilitating the stretching of the ceramic material layer, and reducing or even eliminating the internal stress of the ceramic material layer.

[0032] Preferably, the roller press includes a pressure sensor, and the pressure sensor is communicatively connected to the controller of the roller press. The pressure sensor is used to detect the extrusion force between the first pressing roller and the second pressing roller.

[0033] With such an arrangement, the controller can adjust the gap between the first pressing roller and the second pressing roller according to the detected value of the pressure sensor, thereby achieving the desired roller pressing and stretching effect on the ceramic material layer in the edge region of the pole piece. Description of the Drawings

[0034] The preferred embodiments of the present invention will be described below with reference to the drawings, in which:

[0035] Figure 1 is a schematic structural diagram of a roller press according to an embodiment of the present invention;

[0036] Figure 2 is a front view of the first roller of the roller of a roller press according to an embodiment of the present invention.

[0037] List of Reference Numerals:

[0038] 11. First bracket; 12. Second bracket; 2. First pressing roller; 21. First roller pressing cylindrical section; 22. First connecting shaft; 3. Second pressing roller; 31. Support shaft; 311. Shunt cavity; 312. Branch channel; 313. Confluence cavity; 32. First roller; 321. Groove; 322. Protrusion; 33. Second connecting shaft; 331. Connecting channel; 4. First hydraulic cylinder; 41. First cylinder block; 42. First piston rod; 5. Second hydraulic cylinder; 51. Second cylinder block; 52. Second piston rod; 6. Motor; 7. Heating circulation pump; 71. Delivery pipe; 72. Return pipe. Detailed implementation mode

[0039] First of all, those skilled in the art should understand that the implementation modes described below are only used to explain the technical principle of the present utility model and are not intended to limit the protection scope of the present utility model.

[0040] It should be noted that in the description of the utility model, the terms indicating the direction or positional relationship such as "upper", "lower", "left", "right", etc. are based on the direction or positional relationship shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0041] In addition, it should also be noted that in the description of the present utility model, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. It can be a direct connection or an indirect connection. For those skilled in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0042] Based on the problem that the ceramic material layer in the edge area of the positive electrode sheet mentioned in the background art cannot be stretched well, the present utility model provides a roller press, which includes: a first pressing roller, which includes a first roller pressing cylindrical section; a second pressing roller, whose axis is parallel to the axis of the first pressing roller. The second pressing roller includes a connecting section and at least two second roller pressing cylindrical sections that are coaxial with each other. Any two adjacent second roller pressing cylindrical sections are connected by a connecting section. The outer diameter of the second roller pressing cylindrical section is greater than the maximum radial dimension of the cross-section of the connecting section. The second pressing roller is arranged opposite to the first pressing roller so that the second roller pressing cylindrical section and the first roller pressing cylindrical section squeeze the ceramic material layer on the edge area of the electrode sheet passing through between the first pressing roller and the second pressing roller by moving towards each other.

[0043] With such a setting, when using the roll press of the present utility model to roll and stretch the ceramic material layer in the edge area of the pole piece, the pole piece is threaded between the first pressure roller and the second pressure roller. The second roller pressing cylindrical section on the second pressure roller is facing the ceramic material layer. The second roller pressing cylindrical section and the first roller pressing cylindrical section move towards each other to clamp the ceramic material layer on the pole piece. As the pole piece moves along its length direction, the ceramic material layers at different positions on the pole piece are successively squeezed by the second roller pressing cylindrical section and the first roller pressing cylindrical section and thus stretched. During the rolling and stretching, different stretching degrees of the ceramic material layer can be achieved by adjusting the distance between the first pressure roller and the second pressure roller, so as to achieve the expected stretching effect and realize good stretching of the ceramic material layer in the edge area of the pole piece.

[0044] The following will refer to Figure 1 and Figure 2 for a detailed introduction to the roll press of the present utility model. Among them, Figure 1 is a schematic structural view of the roll press according to an embodiment of the present utility model; Figure 2 is a front view of the first roller of the rollers of the roll press according to an embodiment of the present utility model.

[0045] As Figure 1 shown, the roll press includes a first support 11, a second support 12, and a first pressure roller 2 and a second pressure roller 3 connected between the first support 11 and the second support 12.

[0046] The first pressure roller 2 includes a first roller pressing cylindrical section 21 and two first connecting shafts 22 respectively connected to the left end and the right end of the first roller pressing cylindrical section 21. The two first connecting shafts 22 are rotatably connected to the first support 11 and the second support 12 respectively by means of two first bearings (not shown in the figure). A first pressure sensor (not shown in the figure) is provided between the outer ring of the first bearing on the left first connecting shaft 22 and the first support 11, and a second pressure sensor (not shown in the figure) is provided between the outer ring of the first bearing on the right first connecting shaft 22 and the second support 12. The first pressure sensor and the second pressure sensor are respectively communicatively connected to the controller of the roll press. A motor 6 is fixed on the first support 11, and the output shaft of the motor 6 is drivingly connected to the left first connecting shaft 22 to drive the first pressure roller 2 to rotate about its axis.

[0047] The axis of the second pressure roller 3 is parallel to the axis of the first pressure roller 2, and the second pressure roller 3 is located above the first pressure roller 2 and is arranged opposite to the first pressure roller 2. The second pressure roller 3 includes a cylindrical support shaft 31, four first rollers 32 detachably sleeved on the support shaft 31, and two second connecting shafts 33 respectively connected to the left end and the right end of the support shaft 31. The second pressure roller 3 is configured with a first locking portion for fixing the first roller 32 to the support shaft 31. For example, it includes a threaded hole (not shown in the figure) extending radially inward from the surface of the support shaft 31, a through hole (not shown in the figure) extending radially inward from the surface of the first roller 32, and a bolt (not shown in the figure). A part of the bolt passes through the through hole on the first roller 32 and is screwed into the threaded hole on the support shaft 31, thereby realizing the fixation of the first roller 32 to the support shaft 31. The part of the support shaft 31 covered by the first roller 32 and the first roller 32 form a second roller pressing cylindrical section, and the part of the support shaft 31 not covered by the first roller 32 forms a connecting section. The two second connecting shafts 33 are respectively rotatably and slidably connected to the first bracket 11 and the second bracket 12 by means of two second bearings (not shown in the figure). A first hydraulic cylinder 4 is arranged at a position near the upper end of the first bracket 11. The first hydraulic cylinder 4 includes a first cylinder body 41 and a first piston rod 42. The first cylinder body 41 is fixed to the first bracket 11, and the lower end of the first piston rod 42 is rotatably connected to the left second connecting shaft 33 by means of a third bearing (not shown in the figure). A second hydraulic cylinder 5 is arranged at a position near the upper end of the second bracket 12. The second hydraulic cylinder 5 includes a second cylinder body 51 and a second piston rod 52. The second cylinder body 51 is fixed to the second bracket 12, and the lower end of the second piston rod 52 is rotatably connected to the right second connecting shaft 33 by means of another third bearing (not shown in the figure). The first hydraulic cylinder 4 and the second hydraulic cylinder 5 are communicatively connected to the controller of the roller press.

[0048] Inside the support shaft 31, there are arranged, from left to right in sequence, a shunt cavity 311 communicating with each other, a plurality of branch channels 312, and a confluence cavity 313. The plurality of branch channels 312 are parallel to the axis of the support shaft 31 and are circumferentially arrayed around the axis of the support shaft 31. A connecting channel 331 extending axially therethrough is arranged inside the second connecting shaft 33. The connecting channel 331 inside the left second connecting shaft 33 communicates with the shunt cavity 311, and the connecting channel 331 inside the right second connecting shaft 33 communicates with the confluence cavity 313. The roller press further includes a heating circulation pump 7. The outlet of the heating circulation pump 7 is communicated with the connecting channel 331 inside the left second connecting shaft 33 through a delivery pipe 71, and the inlet of the heating circulation pump 7 is communicated with the connecting channel 331 inside the right second connecting shaft 33 through a return pipe 72. The inside of the heating circulation pump 7, the inside of the delivery pipe 71, the left connecting channel 331, the shunt cavity 311, the branch channels 312, the confluence cavity 313, the right connecting channel 331, and the inside of the return pipe 72 form a circulation channel, and the circulation channel is filled with heat-conducting oil.

[0049] As Figure 2 shown, micron-level textures are formed on the outer peripheral surface of the first roller 32. Specifically, inverted "V"-shaped grooves 321 and inverted "V"-shaped protrusions 322 are formed on the outer peripheral surface of the first roller 32 and are alternately distributed in the circumferential direction.

[0050] When it is necessary to roll and stretch the ceramic material layer in the edge area of the pole piece, the pole piece is threaded between the first pressing roller 2 and the second pressing roller 3. The ceramic material layer in the edge area of the pole piece faces the first roller 32. The controller of the rolling machine controls the operation of the first hydraulic cylinder 4 and the second hydraulic cylinder 5, so that the second pressing roller 3 moves downward to a set position, so that the pole piece is tightly clamped between the first pressing roller 2 and the second pressing roller 3, and the ceramic material layer is squeezed by the first rolling cylindrical section 21 and the first roller 32. The controller controls the operation of the motor 6. The motor 6 drives the first pressing roller 2 to rotate, and the pole piece moves along its length direction, so as to realize that the first rolling cylindrical section 21 and the first roller 32 roll and stretch the ceramic material layer at different length positions on the pole piece. At the same time, the controller controls the operation of the heating circulation pump 7. The heat-conducting oil is heated by the heating circulation pump 7 and circulates in the circulation channel. When the heated heat-conducting oil flows through the branch channel 312, it can increase the temperature of the support shaft 31, and then increase the temperature of the first roller 32 sleeved on the support shaft 31. The first roller 32 with increased temperature contacts the ceramic material layer on the pole piece, so that the temperature of the ceramic material layer increases, making the ceramic material layer have better ductility, facilitating the stretching and extension of the ceramic material layer, and reducing or even eliminating the stress in the ceramic material layer, and avoiding the rupture of the ceramic material layer. The controller also receives the pressure data transmitted by the first pressure sensor and the second pressure sensor in real time, and adjusts the output forces of the first hydraulic cylinder 4 and the second hydraulic cylinder 5 according to the pressure data according to the preset pressure curve, and then dynamically adjusts the pressure of the first roller 32 and the first rolling cylindrical section 21 on the ceramic material layer of the pole piece, so as to ensure the uniformity and stability of the stretching and extension of the ceramic material layer.

[0051] When using the rolling machine of the present invention to roll and stretch the ceramic material layer in the edge area of the pole piece, the different stretching degrees of the ceramic material layer can be achieved by adjusting the distance between the first pressing roller 2 and the second pressing roller 3, and then the expected stretching effect can be achieved, realizing the good stretching of the ceramic material layer in the edge area of the pole piece.

[0052] The second pressure roller 3 includes a support shaft 31 and a first roller 32 detachably sleeved on the support shaft 31. The part of the support shaft 31 covered by the first roller 32 and the first roller 32 form a second roller pressing cylindrical section, and the part of the support shaft 31 not covered by the first roller 32 forms a connection section. The second pressure roller 3 is configured with a first locking portion for fixing the first roller 32 to the support shaft 31. In this way, when the surface of the first roller is severely worn after the roller press has been used for a long time and cannot work properly, only by replacing the first roller can the roller press return to the normal working state, reducing the maintenance cost of the roller press.

[0053] By providing the first pressure sensor and the second pressure sensor, the pressure data of the first pressure roller 2 and the second pressure roller 3 can be detected in real time, and then the pressures of the first pressure roller 2 and the second pressure roller 3 can be dynamically adjusted according to the pressure data, so that the pressures of the first pressure roller 2 and the second pressure roller 3 reach the expected pressures, ensuring the uniformity and stability of the stretching and extension of the ceramic material layer.

[0054] It should be noted that the support shaft 31 is cylindrical, which is only a specific setting method. In actual applications, it can be adjusted. For example, the support shaft 31 can be quadrangular prism-shaped, pentagonal prism-shaped, hexagonal prism-shaped or other suitable prism-shaped, as long as the maximum radial dimension of its cross-section is smaller than the outer diameter of the first roller 32. In addition, the number of the first rollers 32 sleeved on the support shaft 31 is four, which is also a specific setting method. In actual applications, it can be adjusted. For example, the number of the first rollers 32 can be two, six or more. In addition, the first hydraulic cylinder 4 and the second hydraulic cylinder 5 can also be replaced with linear motors; the heating circulation pump 7 can also be replaced with a heating circulation fan, and the circulation channel is filled with air. Of course, the return pipe can also not be provided, and the inlet of the heating circulation fan is communicated with the atmospheric environment, and the right connection channel 331 is communicated with the atmospheric environment.

[0055] In another feasible embodiment, on the basis of the embodiment shown in Figure 1 and Figure 2 a diversion cavity, a plurality of branch channels and a confluence cavity that are communicated with each other are sequentially arranged from left to right inside the first roller pressing cylindrical section 21. The plurality of branch channels are parallel to the axis of the first roller pressing cylindrical section 21 and are circumferentially arrayed around the axis of the first roller pressing cylindrical section 21. A connection channel axially penetrating through is arranged inside the first connecting shaft 22. The connection channel inside the left first connecting shaft 22 is communicated with the diversion cavity, and the connection channel inside the right first connecting shaft 22 is communicated with the confluence cavity. The outlet of the heating circulation pump 7 is also communicated with the connection channel inside the left first connecting shaft 22 through a delivery pipe 71, and the inlet of the heating circulation pump 7 is also communicated with the connection channel inside the right first connecting shaft 22 through a return pipe 72.

[0056] In another feasible embodiment, different from Figure 1 and Figure 2 the embodiment shown, there is no flow dividing cavity 311, branch channels 312 and confluence cavity 313 arranged inside the support shaft 31. A connection channel 331 axially penetrating through the second connection shaft 33 is provided. Instead, a flow dividing cavity, multiple branch channels and a confluence cavity that are communicated with each other are sequentially arranged from left to right inside the first roll-pressing cylindrical section 21. The multiple branch channels are parallel to the axis of the first roll-pressing cylindrical section 21 and are circumferentially arrayed around the axis of the first roll-pressing cylindrical section 21. A connection channel axially penetrating through the first connection shaft 22 is provided. The connection channel inside the left first connection shaft 22 is communicated with the flow dividing cavity, and the connection channel inside the right first connection shaft 22 is communicated with the confluence cavity. The outlet of the heating circulation pump 7 is communicated with the connection channel inside the left first connection shaft 22 through a delivery pipe 71, and the inlet of the heating circulation pump 7 is communicated with the connection channel inside the right first connection shaft 22 through a return pipe 72.

[0057] In another feasible embodiment, different from the above Figure 1 and Figure 2 embodiment shown, there is no flow dividing cavity 311, branch channels 312 and confluence cavity 313 arranged inside the support shaft 31. A connection channel 331 axially penetrating through the second connection shaft 33 is provided, and the heating circulation pump 7, the delivery pipe 71 and the return pipe 72 are not provided.

[0058] In another feasible embodiment, different from the above Figure 1 and Figure 2 embodiment shown, the first pressure sensor and the second pressure sensor are not provided.

[0059] Based on the above respective embodiments, different from the above respective embodiments, the first locking portion can fix the first roller 32 to any position of the support shaft 31. For example, the first locking portion includes a threaded hole extending radially inwards from the surface of the first roller 32 and a setscrew arranged in the threaded hole. By screwing the setscrew to make the setscrew tightly press against the surface of the support shaft 31, the fixing of the first roller 32 to the support shaft 31 is realized. Through such a setting, the first roller 32 can be fixed to any position of the support shaft 31.

[0060] Based on the above respective embodiments, preferably, the roll press further includes at least two second rollers. The second rollers can replace the first rollers, so that the second rollers and the part of the support shaft 31 covered by the second rollers form a second roll-pressing cylindrical section, and the part of the support shaft not covered by the second rollers forms a connection section; the roughness of the outer peripheral surface of the second rollers is different from that of the outer peripheral surface of the first rollers, and / or the hardness of the outer peripheral surface of the second rollers is different from that of the outer peripheral surface of the first rollers. For example, different textures can be provided on the outer peripheral surface of the second rollers from those on the outer peripheral surface of the first roller 32, so that the roughness of the outer peripheral surface of the second rollers is different from that of the outer peripheral surface of the first roller 32. The first rollers and the second rollers are made of different materials, so that the hardness of the outer peripheral surface of the second rollers is different from that of the outer peripheral surface of the first rollers.

[0061] For different pole pieces, the ceramic material layers in their edge regions may use different ceramic materials, the thicknesses of the ceramic material layers may be different, the hardnesses of the ceramic material layers may be different, and the degrees to which the ceramic material layers need to be stretched are different. Through the above settings, for different pole pieces, corresponding rollers can be selected according to the differences in the ceramic material layers to roll-press the ceramic material layers, reducing the risk of insufficient stretching or over-stretching of the ceramic material layers.

[0062] Preferably, the second rollers are sleeved on the support shaft 31, and the second pressure roller 3 is provided with a second locking portion for fixing the second rollers to the support shaft 31. When the second rollers are not needed, the second rollers move to the ends of the support shaft 31.

[0063] Through such a setting, it is possible to conveniently replace the first rollers 32 with the second rollers without removing the support shaft 31.

[0064] Preferably, the second locking portion can fix the second rollers to any position of the support shaft 31. For example, the second locking portion includes a threaded hole extending radially inward from the surface of the second rollers and a setscrew arranged in the threaded hole. By screwing the setscrew to tighten against the surface of the support shaft 31, the fixing of the second rollers to the support shaft 31 is achieved. Through such a setting, the second rollers can be fixed to any position of the support shaft 31, and then the second rollers can be fixed to the corresponding positions of the support shaft 31 according to the positions of the ceramic material layers on the pole pieces, so as to meet the stretching requirements of the ceramic material layers on pole pieces of different widths.

[0065] In another feasible embodiment, as above Figure 1 and Figure 2Different from the illustrated embodiment, the shunt cavity 311, the branch channel 312 and the confluence cavity 313 are not provided. A connection channel 331 penetrating axially is provided in the second connecting shaft 33. The heating circulation pump 7, the delivery pipe 71 and the return pipe 72 are not provided. The second pressing roller includes a connecting section and at least two second roller pressing cylindrical sections that are coaxial with each other. Any two adjacent second roller pressing cylindrical sections are connected by a connecting section. The outer diameter of the second roller pressing cylindrical section is greater than the maximum radial dimension of the cross section of the connecting section. The second pressing roller is disposed opposite to the first pressing roller, and the ceramic material layer on the edge area of the pole piece passing through between the first pressing roller and the second pressing roller is extruded in a manner that the second roller pressing cylindrical section and the first roller pressing cylindrical section move towards each other. Preferably, the second roller pressing cylindrical section and the connecting section are non-detachably connected. The second pressing roller includes multiple groups of different second roller pressing cylindrical sections. Each group of second roller pressing cylindrical sections includes at least two second roller pressing cylindrical sections. The roughness and hardness of the outer peripheral surfaces of each group of second roller pressing cylindrical sections are the same, and the roughness and hardness of the outer peripheral surfaces of different groups of second roller pressing cylindrical sections are different. The corresponding second roller pressing cylindrical section and the connecting section can be selected according to the difference of the ceramic material layer to form the second pressing roller to roll the ceramic material layer, reducing the risk of insufficient or excessive stretching of the ceramic material layer. Preferably, a temperature raising device, such as an electric heating wire or an electric heating rod, is provided in the second roller pressing cylindrical section, and the temperature of the second roller pressing cylindrical section is raised by the heat generated by the electric heating wire. Of course, a temperature raising device can also be provided in the first roller pressing cylindrical section to raise the temperature of the first roller pressing cylindrical section when rolling and stretching the ceramic material layer on the pole piece.

[0066] So far, the technical solution of the present invention has been described in conjunction with the preferred embodiments shown in the drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A roller press, characterized in that, The roll press includes: A first press roll, which includes a first roll pressing cylindrical section; A second press roll, whose axis is parallel to the axis of the first press roll. The second press roll includes a connecting section and at least two second roll pressing cylindrical sections that are coaxial with each other. Any two adjacent second roll pressing cylindrical sections are connected by one of the connecting sections. The outer diameter of the second roll pressing cylindrical section is greater than the maximum radial dimension of the cross-section of the connecting section. The second press roll is disposed opposite to the first press roll so that the second roll pressing cylindrical section and the first roll pressing cylindrical section squeeze the ceramic material layer on the edge region of the pole piece passing between the first press roll and the second press roll by moving towards each other.

2. The roll press according to claim 1, characterized in that, The second press roll includes a support shaft and at least two first rollers detachably sleeved on the support shaft. The first rollers and the part of the support shaft covered by the first rollers constitute the second roll pressing cylindrical section, and the part of the support shaft not covered by the first rollers constitutes the connecting section; The second press roll is configured with a first locking portion for fixing the first roller to the support shaft.

3. The roller press according to claim 2, characterized in that, The roll press further includes at least two second rollers that can replace the first rollers so that the second rollers and the part of the support shaft covered by the second rollers constitute the second roll pressing cylindrical section, and the part of the support shaft not covered by the second rollers constitutes the connecting section; The roughness of the outer peripheral surface of the second roller is different from that of the outer peripheral surface of the first roller, and / or the hardness of the outer peripheral surface of the second roller is different from that of the outer peripheral surface of the first roller.

4. The roll press according to claim 3, characterized in that, The outer peripheral surface of the first roller is provided with a first concave-convex texture, and the outer peripheral surface of the second roller is provided with a second concave-convex texture so that the roughness of the outer peripheral surface of the second roller is different from that of the outer peripheral surface of the first roller.

5. The roller press according to any one of claims 2 to 4, characterized in that, The first locking portion can fix the first roller to any position of the support shaft.

6. The roll press according to claim 3 or 4, characterized in that, The second roller is sleeved on the support shaft, and the second press roll is configured with a second locking portion for fixing the second roller to the support shaft.

7. The roll press according to claim 6, characterized in that, The second locking portion can fix the second roller to any position of the support shaft.

8. The roll press according to claim 1, characterized in that The second roll pressing cylindrical section is configured with a first temperature-raising device for raising the temperature of the second roll pressing cylindrical section; and / or the first roll pressing cylindrical section is configured with a second temperature-raising device for raising the temperature of the first roll pressing cylindrical section.

9. The roll press according to any one of claims 2 to 4, characterized in that, A flow channel extending along the axial direction of the support shaft is provided inside the support shaft. The flow channel has an inlet and an outlet. The roll press includes a heating device, and the outlet of the heating device is communicated with the inlet of the flow channel to introduce high-temperature fluid into the flow channel, thereby raising the temperature of the rollers sleeved on the support shaft.

10. The roll press according to any one of claims 1 to 4, characterized in that, The roll press includes a pressure sensor communicatively connected to the controller of the roll press. The pressure sensor is used to detect the extrusion pressure between the first press roll and the second press roll.

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