An electrode tab material belt stretching device and a rolling system

Abstract

The application discloses an electrode piece material belt stretching device and a rolling system, and relates to the technical field of battery production. The electrode piece material belt stretching device comprises a mandrel and coating area stretching wheels and blank area stretching wheels arranged in sequence in the axial direction of the mandrel. The blank area stretching wheels comprise a first sleeve, an eccentric wheel, an adjusting assembly and a first roller sleeve. The first sleeve is coaxially arranged on the outer side wall of the mandrel. The eccentric wheel is rotatably sleeved on the outer side wall of the first sleeve. The eccentric wheel is locked relative to the mandrel through the adjusting assembly. The first roller sleeve is rotatably sleeved on the outer side wall of the eccentric wheel. The adjusting assembly is used for driving the central axis of the eccentric wheel to rotate around the central axis of the first sleeve to a plurality of positions under the action of an external force, so that the outer side wall of the first roller sleeve protrudes from the outer side wall of the coating area stretching wheel to different degrees in the same radial direction of the mandrel. The electrode piece material belt stretching device provided by the application is suitable for electrode piece material belts with fluctuating thickness differences and can provide higher stretching precision for the electrode piece material belts.

Description

Technical Field

[0001] This invention relates to the field of battery manufacturing technology, and more specifically, to an electrode strip stretching device and a rolling system. Background Technology

[0002] In the battery manufacturing process, after coating the foil surface with active material, an electrode strip is obtained. The electrode strip has a coated area and a blank area arranged along its width. During the subsequent rolling process of the electrode strip, the difference in thickness between the coated area and the blank area leads to inconsistent elongation. After rolling, the edges of the blank area wrinkle, affecting the quality of the electrode.

[0003] To address this issue, tension rollers wrapped with Teflon cloth are commonly used to pre-stretch the electrode strip before roll forming, or to flatten the electrode strip after roll forming. Because the area wrapped with Teflon cloth protrudes from the roller surface, corresponding to the stretching blank area, more tension can be applied to the blank area, allowing it to achieve greater stretching than the coated area. This solves the wrinkling problem after roll forming caused by the inconsistent stretching rates of the two areas.

[0004] Due to manufacturing errors, the thickness difference between the coated area and the blank area on the electrode strip fluctuates, requiring frequent adjustments to the thickness of the Teflon cloth on the tension roller. Adjusting the Teflon cloth is a manual operation, making precise control of the winding thickness difficult, time-consuming, and labor-intensive. It can also easily lead to insufficient or excessive stretching of the blank area, thus affecting the quality of the electrode. Summary of the Invention

[0005] The purpose of this invention is to provide an electrode strip stretching device that is suitable for electrode strips with fluctuating thickness differences, and can provide a more precise stretching effect for the electrode strip, thereby improving the electrode yield.

[0006] Another objective of this invention is to provide a rolling system that can provide a more precise stretching effect on electrode strips, thereby improving the electrode yield.

[0007] An embodiment of the present invention provides a technical solution:

[0008] An electrode strip stretching device includes a mandrel, a coating area stretching wheel and a blank area stretching wheel, wherein the coating area stretching wheel and the blank area stretching wheel are arranged sequentially along the axial direction of the mandrel, and the coating area stretching wheel is used to stretch the coating area of ​​the electrode strip.

[0009] The blank area stretching wheel includes a first sleeve, an eccentric wheel, an adjusting assembly, and a first roller sleeve. The first sleeve is coaxially disposed on the outer wall of the mandrel. The eccentric wheel is rotatably sleeved on the outer wall of the first sleeve, and the eccentric wheel is locked relative to the mandrel by the adjusting assembly. The first roller sleeve is rotatably sleeved on the outer wall of the eccentric wheel and is used to stretch the blank area of ​​the electrode strip. The adjusting assembly is used to drive the central axis of the eccentric wheel to rotate around the central axis of the first sleeve to multiple positions under the action of external force, so that the outer wall of the first roller sleeve protrudes to different degrees from the outer wall of the coating area stretching wheel in the same radial direction of the mandrel.

[0010] Furthermore, the eccentric wheel is eccentrically provided with a mounting hole and an internal gear ring. The mounting hole and the internal gear ring are coaxially arranged. The eccentric wheel is rotatably sleeved on the outer side wall of the first sleeve through the mounting hole. The internal gear ring meshes with the adjusting component and is used to drive the eccentric wheel to rotate around the central axis of the first sleeve under the action of the adjusting component.

[0011] Furthermore, the adjustment assembly includes a gear, a connecting shaft, and a locking module. The connecting shaft is coaxially connected to the gear, and the gear meshes with the internal gear ring. The connecting shaft is used to drive the gear to rotate under the action of external force, and the locking module is used to lock or unlock the connecting shaft to the spindle.

[0012] Furthermore, a first shaft hole is provided through the first sleeve, the central axis of the first shaft hole is parallel to the central axis of the first sleeve, one end of the connecting shaft passes through the first shaft hole and is coaxially connected to the gear, and the connecting shaft and the first shaft hole are rotatably engaged, and the end of the connecting shaft away from the gear is engaged with the locking module.

[0013] Furthermore, the locking module includes a mounting block and a locking screw. The mounting block protrudes from the outer side wall of the spindle. The connecting shaft passes through the mounting block and is rotatably engaged with the mounting block. The locking screw is threadedly engaged with the mounting block and is used to screw relative to the mounting block to radially abut against the connecting shaft to lock the connecting shaft.

[0014] Furthermore, there are multiple stretching wheels for the coating area and multiple stretching wheels for the blank area, and these multiple stretching wheels for the coating area and multiple stretching wheels for the blank area are arranged alternately along the axial direction of the mandrel.

[0015] The first sleeve has multiple first shaft holes, one of which is used for the connecting shaft corresponding to the first sleeve to pass through, and the remaining first shaft holes are used for the connecting shafts corresponding to the remaining blank area stretching wheels to pass through.

[0016] Furthermore, the coating area stretching wheel includes a second sleeve and a second roller sleeve. The second sleeve is coaxially disposed on the outer side wall of the mandrel, and the second roller sleeve is rotatably sleeved on the outer side wall of the second sleeve. The second roller sleeve is used to stretch the coating area of ​​the electrode strip during the process of rotating around the central axis of the second sleeve.

[0017] The second sleeve has a plurality of second shaft holes through it, which are respectively aligned with a plurality of first shaft holes. The plurality of second shaft holes are used for the connecting shafts corresponding to the plurality of blank area stretching wheels to pass through.

[0018] Furthermore, the position on the outer side wall of the first roller sleeve closest to the central axis of the first sleeve is flush with the outer side wall of the coating area stretching wheel, and the position furthest from the central axis of the first sleeve protrudes radially from the outer side wall of the coating area stretching wheel towards the mandrel.

[0019] Furthermore, the first roller sleeve is provided with a chamfered bevel, and the outer wall of the first roller sleeve is connected to the end walls at both ends respectively through the two chamfered bevels.

[0020] Embodiments of the present invention also provide a rolling system, including a first guide roller, a second guide roller, and an electrode strip stretching device as described above. The electrode strip stretching device includes a mandrel, a coating area stretching wheel, and a blank area stretching wheel. The coating area stretching wheel and the blank area stretching wheel are sequentially arranged axially along the mandrel. The coating area stretching wheel is used to stretch the coating area of ​​the electrode strip. The blank area stretching wheel includes a first sleeve, an eccentric wheel, an adjusting assembly, and a first roller sleeve. The first sleeve is coaxially disposed on the outer side wall of the mandrel. An eccentric wheel is rotatably fitted onto the outer wall of the first sleeve, and the eccentric wheel is locked relative to the mandrel via the adjusting assembly. A first roller sleeve is rotatably fitted onto the outer wall of the eccentric wheel, used to stretch the blank area of ​​the electrode strip. The adjusting assembly is used to drive the central axis of the eccentric wheel to rotate around the central axis of the first sleeve to multiple positions under external force, so that the outer wall of the first roller sleeve protrudes to different degrees from the outer wall of the coating area stretching wheel in the same radial direction of the mandrel. The electrode strip stretching device is disposed between the first and second guide rollers, and the mandrel is parallel to both the first and second guide rollers.

[0021] Compared to existing technologies, the electrode strip stretching device provided by this invention has an adjustment component for the blank area stretching wheel. Under external force, the adjustment component can drive the eccentric wheel to rotate around the central axis of the first sleeve, allowing the central axis of the eccentric wheel to rotate to multiple positions around the central axis of the first sleeve. This results in the outer wall of the first roller sleeve protruding to varying degrees from the outer wall of the coating area stretching wheel on the same radial direction of the mandrel. In practical applications, when the outer wall of the coating area stretching wheel is in contact with the coating area of ​​the electrode strip, adjusting the rotation of the eccentric wheel via the adjustment component allows the outer wall of the first roller sleeve to protrude to varying degrees from the position where the outer wall of the coating area stretching wheel is in contact with the coating area. At this position, it contacts the blank area, providing varying degrees of tension to the blank area, thus adapting to changes in the thickness difference between the blank area and the coating area at different positions on the electrode strip. Therefore, the beneficial effects of the electrode strip stretching device provided by this invention include: suitability for electrode strips with fluctuating thickness differences; provision of higher precision stretching effect for the electrode strip; and improved electrode yield. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of the present invention and should not be considered as limiting the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 A schematic diagram of a portion of the structure of the roller pressing system provided in an embodiment of the present invention, in one state;

[0024] Figure 2 for Figure 1 Schematic diagram of the structure of the medium electrode sheet stretching device;

[0025] Figure 3 for Figure 1 Schematic diagram of the cross section of AA;

[0026] Figure 4 for Figure 2 A schematic diagram of the connection structure between the first sleeve of the stretching wheel in the middle blank area and the eccentric wheel and the first roller sleeve;

[0027] Figure 5 for Figure 4 Cross-sectional view of BB;

[0028] Figure 6 A schematic diagram of the eccentric wheel for the stretching wheel in the blank area;

[0029] Figure 7 for Figure 6 Cross-sectional view of DD;

[0030] Figure 8 A schematic diagram of the structure of the first sleeve of the stretching wheel in the blank area;

[0031] Figure 9 for Figure 8 Cross-sectional view of the middle EE;

[0032] Figure 10 A cross-sectional schematic diagram showing the connection structure between the mandrel, the draw rope wheel in the blank area, and the stretching wheel in the coating area;

[0033] Figure 11 A schematic diagram of a portion of the roll forming system provided in an embodiment of the present invention in another state;

[0034] Figure 12 for Figure 11 A cross-sectional view of FF.

[0035] Icons: 10-Roller system; 11-First pass roller; 12-Second pass roller; 100-Electrode sheet stretching device; 110-Mandrel; 120-Coating zone stretching roller; 121-Second sleeve; 1211-Second shaft hole; 122-Second roller sleeve; 130-Blank zone stretching roller; 131-First sleeve; 1311-First shaft hole; 1312-First outer side wall; 1313-Second outer side wall; 13 14 - Clearance space; 132 - Eccentric wheel; 1321 - Mounting hole; 1322 - Internal gear ring; 133 - Adjustment component; 1331 - Gear; 1332 - Connecting shaft; 1333 - Locking module; 1334 - Mounting block; 1335 - Locking screw; 1336 - Handle; 134 - First roller sleeve; 1341 - Chamfered bevel; 200 - Electrode strip; 210 - Coating area; 220 - Blank area. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0038] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0039] In the description of this invention, it should be understood that the terms "upper," "lower," "inner," "outer," "left," "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this invention and to simplify the description, and are not intended to 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 invention.

[0040] Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0041] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, terms such as "set" and "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0042] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0043] Example

[0044] In the battery manufacturing process, after coating the foil surface with active material, an electrode strip 200 is obtained. The electrode strip 200 has alternating coating areas 210 and blank areas 220 along its width. Because of the presence of the active material layer, the coating area 210 is thicker than the blank area 220. During the roll forming process of the electrode strip 200, due to the difference in thickness, the elongation of the coating area 210 and the blank area 220 is inconsistent, causing wrinkles to easily form at the edge where the blank area 220 connects to the coating area 210 after roll forming.

[0045] To address this problem, this embodiment provides a roll forming system 10, which includes an electrode strip stretching device 100 that can stretch the coating area 210 and the blank area 220 on the electrode strip 200 with different tensions, thereby eliminating wrinkles.

[0046] Please see Figure 1 , Figure 1The diagram shown is a partial structural schematic of the roller pressing system 10 provided in this embodiment under one state.

[0047] The roller pressing system 10 provided in this embodiment includes a first roller 11, a second roller 12, and an electrode strip stretching device 100. The electrode strip stretching device 100 is disposed between the first roller 11 and the second roller 12 and is used to stretch the electrode strip 200 during the process of the electrode strip 200 moving from the first roller 11 to the second roller 12.

[0048] It is understood that the rolling system 10 also includes a rolling device, which can be located upstream of the first passing roller 11 or downstream of the second passing roller 12. If the rolling device is located upstream of the first passing roller 11, the electrode strip stretching device 100 stretches the rolled electrode strip 200, thereby flattening the electrode strip 200 and eliminating wrinkles at the edges of the blank areas of the electrode strip 200.

[0049] If the rolling device is located downstream of the second roller 12, the electrode strip stretching device 100 pre-stretches the electrode strip 200 before rolling, extending the blank area to a certain extent in advance compared to the coating area 210, thus preventing wrinkles at the edges of the blank area after rolling. The rolling device is a conventional structure and will not be described further in this embodiment.

[0050] Please refer to the following: Figure 2 , Figure 2 The diagram shows the structure of the electrode strip stretching device 100.

[0051] The electrode strip stretching device 100 provided in this embodiment includes a mandrel 110, a coating area stretching wheel 120 and a blank area stretching wheel 130. The coating area stretching wheel 120 and the blank area stretching wheel 130 are arranged sequentially in the axial direction of the mandrel 110. The outer wall of the coating area stretching wheel 120 is used to stretch the coating area 210 of the electrode strip 200, and the outer wall of the blank area stretching wheel 130 is used to stretch the blank area 220 of the electrode strip 200.

[0052] There are multiple stretching rollers 120 in the coating area and multiple stretching rollers 130 in the blanking area. Based on the structural characteristics of the electrode strip 200 with alternating coating areas 210 and blanking areas 220, the stretching rollers 120 in the coating area and the stretching rollers 130 in the blanking area are alternately distributed along the axial direction of the mandrel 110. It can be understood that adaptively adjusting the number of stretching rollers 120 in the coating area and the stretching rollers 130 in the blanking area can accommodate electrode strips 200 with different numbers of coating areas 210 and blanking areas 220.

[0053] Please refer to the following: Figure 3 , Figure 3 As shown Figure 1 Schematic diagram of the cross section of AA.

[0054] In this embodiment, the blank area stretching wheel 130 includes a first sleeve 131, an eccentric wheel 132, an adjusting component 133, and a first roller sleeve 134. The first sleeve 131 is coaxially disposed on the outer side wall of the mandrel 110. The eccentric wheel 132 is rotatably sleeved on the outer side wall of the first sleeve 131, and the eccentric wheel 132 is locked relative to the mandrel 110 by the adjusting component 133. The first roller sleeve 134 is rotatably sleeved on the outer side wall of the eccentric wheel 132.

[0055] The coating area stretching roller 120 includes a second sleeve 121 and a second roller sleeve 122. The second sleeve 121 is coaxially disposed on the outer side wall of the mandrel 110, and the second roller sleeve 122 is rotatably sleeved on the outer side wall of the second sleeve 121. The second roller sleeve 122 is used to stretch the coating area 210 of the electrode strip 200 during the rotation around the central axis of the second sleeve 121.

[0056] In this embodiment, the first sleeve 131 and the mandrel 110, as well as the second sleeve 121 and the mandrel 110, are connected by a flat key, so that the first sleeve 131 and the second sleeve 121 are fixed relative to the mandrel 110.

[0057] Please refer to the following: Figure 4 and Figure 5 , Figure 4 The diagram shown is a structural schematic of the connection structure between the first sleeve 131, the eccentric wheel 132, and the first roller sleeve 134. Figure 5 As shown Figure 4 Schematic diagram of cross section of BB.

[0058] Bearings are provided between the eccentric wheel 132 and the first sleeve 131, between the first roller sleeve 134 and the eccentric wheel 132, and between the second roller sleeve 122 and the second sleeve 121 to establish a rotatable fit. To prevent the blank area 220 from being broken when the first roller sleeve 134 stretches, in this embodiment, the first roller sleeve 134 is provided with a chamfered bevel 1341, and the outer wall of the first roller sleeve 134 is connected to the end walls at both ends through two chamfered bevels 1341. In other words, the corner between the outer wall and the end wall of the first roller sleeve 134 is chamfered. Furthermore, in this embodiment, the first roller sleeve 134 is made of ceramic. In other embodiments, it can also be formed by coating a wear-resistant material onto a metal surface; the wear-resistant material can be Teflon, DLC, etc.

[0059] In practical applications, the blank area 220 on the electrode strip 200 is in contact with the outer wall of the first roller sleeve 134, and the coating area 210 is in contact with the outer wall of the second roller sleeve 122. During the conveying process of the electrode strip 200, under the action of friction, the blank area 220 drives the first roller sleeve 134 to rotate relative to the eccentric wheel 132. The first roller sleeve 134 provides tension to the blank area 220 so that the blank area 220 is stretched. The coating area 210 drives the second roller sleeve 122 to rotate relative to the second sleeve 121. The second roller sleeve 122 provides tension to the coating area 210 so that the coating area 210 is stretched.

[0060] The adjusting component 133 is used to drive the eccentric wheel 132 to rotate relative to the first sleeve 131 to multiple positions under the action of external force. The central axis of the eccentric wheel 132 is parallel and misaligned with the central axis of the first sleeve 131, so that the central axis of the eccentric wheel 132 rotates around the central axis of the first sleeve 131 to multiple positions, thereby causing the outer wall of the first roller sleeve 134 to protrude to different degrees from the outer wall of the coating area stretching wheel 120 in the same radial direction of the mandrel 110.

[0061] In fact, the same radial point on the mandrel 110 is the direction in which the electrode strip tensioning device 100 tensions the electrode strip 200 in actual applications, i.e. Figure 1 The direction indicated by arrow C. Therefore, when any position on the outer wall of the second roller sleeve 122 is rotated to the direction indicated by arrow C, it adheres to the coating area 210 of the electrode material strip 200. When any position on the outer wall of the first roller sleeve 134 is rotated to the direction indicated by arrow C, it adheres to the coating area 210 of the electrode material strip 200.

[0062] Please refer to the following: Figure 6 and Figure 7 , Figure 6 The diagram shown is a structural schematic of the eccentric wheel 132. Figure 7 As shown Figure 6 Schematic diagram of cross-section of DD.

[0063] The eccentric wheel 132 is eccentrically provided with a mounting hole 1321 and an internal gear ring 1322. The mounting hole 1321 and the internal gear ring 1322 are coaxially arranged. The eccentric wheel 132 is rotatably sleeved on the outer side wall of the first sleeve 131 through the mounting hole 1321. The internal gear ring 1322 meshes with the adjusting component 133 and is used to drive the eccentric wheel 132 to rotate around the central axis of the first sleeve 131 under the action of the adjusting component 133.

[0064] In fact, the mounting hole 1321 is coaxial with the internal gear ring 1322 and forms a stepped hole that passes through the eccentric wheel 132. The diameter of the mounting hole 1321 is larger than the inner diameter of the internal gear ring 1322. The central axis of the mounting hole 1321 and the internal gear ring 1322 is O1, and the central axis of the eccentric wheel 132 is O2. O1 and O2 are parallel and misaligned. When the eccentric wheel 132 is sleeved on the first sleeve 131, O1 coincides with the central axis of the first sleeve 131, that is, coincides with the central axis of the mandrel 110, and O2 is parallel to and misaligned with the central axis of the mandrel 110.

[0065] Please refer to the following: Figure 8 and Figure 9 , Figure 8 The diagram shown is a structural schematic of the first sleeve 131. Figure 9 As shown Figure 8 A cross-sectional view of the EE.

[0066] Corresponding to the stepped hole formed by the mounting hole 1321 on the eccentric wheel 132 and the internal gear ring 1322, the first sleeve 131 is provided with a first outer side wall 1312 and a second outer side wall 1313 that are axially distributed and form a stepped structure. Compared with the first outer side wall 1312, the second outer side wall 1313 is further away from the central axis of the first sleeve 131.

[0067] During assembly, the second outer side wall 1313 is connected to the inner edge of a bearing, the wall of the mounting hole 1321 is connected to the outer edge of the bearing, the first outer side wall 1312 is radially corresponding to the internal gear ring 1322, and the two form a clearance space 1314 for the adjustment component 133 to make way, and the adjustment component 133 meshes with the internal gear ring 1322 in the clearance space 1314.

[0068] Please refer to the following: Figure 10 , Figure 10 The diagram shown is a cross-sectional view of the connection structure between the mandrel 110, the draw rope wheel of the blank area 220, and the stretching wheel 120 of the coating area.

[0069] The adjustment assembly 133 includes a gear 1331, a connecting shaft 1332, and a locking module 1333. The connecting shaft 1332 is coaxially connected to the gear 1331. The gear 1331 meshes with the internal gear ring 1322. The connecting shaft 1332 is used to drive the gear 1331 to rotate under the action of external force. The locking module 1333 is used to lock or unlock the connecting shaft 1332 to the spindle 110.

[0070] A first shaft hole 1311 is provided through the first sleeve 131. The central axis of the first shaft hole 1311 is parallel to the central axis of the first sleeve 131. One end of the connecting shaft 1332 passes through the first shaft hole 1311 and is coaxially connected to the gear 1331. The connecting shaft 1332 and the first shaft hole 1311 are rotatably engaged. The end of the connecting shaft 1332 away from the gear 1331 is engaged with the locking module 1333.

[0071] Gear 1331 is housed within the clearance space 1314 formed by the first outer wall 1312 of the first sleeve 131 and the internal gear ring 1322 of the eccentric wheel 132, and meshes with the internal gear ring 1322. One end of the first shaft hole 1311 communicates with the clearance space 1314, and one end of the connecting shaft 1332 passes through the first shaft hole 1311 and extends into the clearance space 1314, coaxially connecting with gear 1331. In effect, the first shaft hole 1311 limits the movement of the connecting shaft 1332, allowing the connecting shaft 1332 to rotate relative to the first shaft hole 1311.

[0072] In this embodiment, a handle 1336 is provided at the end of the connecting shaft 1332 away from the gear 1331. When the thickness between the coating area 210 and the blank area 220 on the electrode strip 200 changes, and it is necessary to adjust the degree of protrusion of the first roller sleeve 134 relative to the second roller sleeve 122 in the direction of arrow C, the locking module 1333 releases the lock on the connecting shaft 1332. Then, the handle 1336 is rotated, which drives the gear 1331 to rotate through the connecting shaft 1332. The gear 1331 drives the internal gear ring 1322 to rotate synchronously, thereby driving the eccentric wheel 132 to rotate, thus changing the degree of protrusion of the first roller sleeve 134 in the direction of arrow C. When the adjustment is in place, the locking module 1333 relocks the connecting shaft 1332, thereby locking the internal gear ring 1322 and preventing the eccentric wheel 132 from rotating relative to the first sleeve 131.

[0073] In this embodiment, the locking module 1333 includes a mounting block 1334 and a locking screw 1335. The mounting block 1334 protrudes from the outer wall of the spindle 110. The connecting shaft 1332 passes through the mounting block 1334 and is rotatably engaged with the mounting block 1334. The locking screw 1335 is threadedly engaged with the mounting block 1334 and is used to screw relative to the mounting block 1334 to radially abut against the connecting shaft 1332 to lock the connecting shaft 1332. When it is necessary to release the locking of the connecting shaft 1332, the locking screw 1335 is rotated in the opposite direction to disengage the locking screw 1335 from the connecting shaft 1332.

[0074] Since multiple coating area stretching rollers 120 and multiple blank area stretching rollers 130 are arranged alternately in the axial direction of the mandrel 110 to form a layout queue, and one end of the handle 1336 of the connecting shaft 1332 corresponding to each blank area stretching roller 130 is located at one end of the layout queue, the connecting shaft 1332 corresponding to the blank area stretching roller 130 located between the two ends of the layout queue may need to pass through multiple coating area stretching rollers 120 or multiple other blank area stretching rollers 130.

[0075] In order to ensure that the connecting shafts 1332 corresponding to each blank area stretching wheel 130 can be smoothly inserted into their respective clearance spaces 1314, in this embodiment, the first sleeve 131 is provided with multiple first shaft holes 1311. One of the multiple first shaft holes 1311 is used for the connecting shafts 1332 corresponding to the first sleeve 131 to pass through, and the remaining first shaft holes 1311 are used for the connecting shafts 1332 corresponding to the other blank area stretching wheels 130 to pass through.

[0076] Similarly, the second sleeve 121 is provided with a plurality of second shaft holes 1211, which are aligned with a plurality of first shaft holes 1311 respectively. The plurality of second shaft holes 1211 are used for the connecting shafts 1332 corresponding to the plurality of blank area stretching wheels 130 to pass through.

[0077] Please refer to the following: Figure 11 and Figure 12 , Figure 11 The diagram shown is a partial structural schematic of the roller pressing system 10 provided in this embodiment under another state. Figure 12 As shown Figure 11 A cross-sectional view of FF.

[0078] It is understood that the central axis O1 of the mounting hole 1321 coincides with the central axis of the mandrel 110, that is, O1 can be regarded as the central axis of the mandrel 110 in the assembled state. In this embodiment, the point closest to O1 on the outer wall of the eccentric wheel 132 is set as point C1, and the point farthest from O1 on the outer wall of the eccentric wheel 132 is set as point C2.

[0079] exist Figure 1 In the state shown, point C1 rotates to the direction indicated by arrow C, while point C2 moves away from the direction indicated by arrow C. In this embodiment, in Figure 1 In the state shown, the outer wall of the first roller sleeve 134 is flush with the outer wall of the second roller sleeve 122 when rotated to the direction indicated by arrow C. It can be understood that in this state, the blank area 220 on the electrode strip 200 cannot be effectively stretched by the first roller sleeve 134.

[0080] exist Figure 11In the state shown, point C2 rotates to the direction indicated by arrow C, while point C1 moves away from arrow C. In this state, the outer wall of the first roller sleeve 134 protrudes to the maximum extent from the outer wall of the second roller sleeve 122 when it rotates to the direction indicated by arrow C. That is, in this state, the blank area 220 on the electrode strip 200 experiences the greatest tension, and the relative extension of the blank area 220 compared to the coating area 210 is the greatest.

[0081] And by Figure 1 The state shown Figure 11 During the state transition shown, the outer wall of the first roller sleeve 134 gradually protrudes more than the outer wall of the second roller sleeve 122 when it rotates to the direction indicated by arrow C, that is, the tension on the blank area 220 gradually increases.

[0082] Therefore, in practical applications, by rotating the handle 1336 to drive the eccentric wheel 132 to rotate, the first roller sleeve 134 can protrude from the second roller sleeve 122 to different degrees at the position of contacting the electrode strip 200, thereby adapting to the different height differences between the blank area 220 and the coating area 210 at different positions on the electrode strip 200, enabling fine adjustment and obtaining a better stretching effect.

[0083] In summary, the electrode strip stretching device 100 and roller pressing system 10 provided in this embodiment are suitable for electrode strips 200 with varying thicknesses, and can provide higher precision stretching effect for the electrode strips 200, thereby improving the electrode yield.

[0084] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A pole piece web stretching device characterized by, The application relates to a stretching device for a pole piece material belt, which comprises a mandrel (110), a coating zone stretching wheel (120) and a blank zone stretching wheel (130), the coating zone stretching wheel (120) and the blank zone stretching wheel (130) are sequentially arranged on the mandrel (110) in the axial direction, and the outer side wall of the coating zone stretching wheel (120) is used for stretching the coating zone (210) of the pole piece material belt (200). The blank zone stretching wheel (130) comprises a first sleeve (131), an eccentric wheel (132), an adjusting assembly (133) and a first roller sleeve (134), the first sleeve (131) is coaxially arranged on the outer side wall of the mandrel (110), the eccentric wheel (132) is rotatably sleeved on the outer side wall of the first sleeve (131), and the eccentric wheel (132) is locked relative to the mandrel (110) through the adjusting assembly (133); the first roller sleeve (134) is rotatably sleeved on the outer side wall of the eccentric wheel (132) and is used for stretching the blank zone (220) of the pole piece material belt (200); and the adjusting assembly (133) is used for driving the central axis of the eccentric wheel (132) to rotate around the central axis of the first sleeve (131) to a plurality of positions under the action of an external force, so that the outer side wall of the first roller sleeve (134) protrudes from the outer side wall of the coating zone stretching wheel (120) to different degrees in the same radial direction of the mandrel (110).

2. The pole piece web stretching apparatus of claim 1, wherein The eccentric wheel (132) is eccentrically provided with a mounting hole (1321) and an inner gear ring (1322), the mounting hole (1321) and the inner gear ring (1322) are coaxially arranged, the eccentric wheel (132) is rotatably sleeved on the outer side wall of the first sleeve (131) through the mounting hole (1321), and the inner gear ring (1322) is engaged with the adjusting assembly (133) and is used for driving the eccentric wheel (132) to rotate around the central axis of the first sleeve (131) under the action of the adjusting assembly (133).

3. The pole piece web stretching apparatus of claim 2, wherein The adjusting assembly (133) comprises a gear (1331), a connecting shaft (1332) and a locking module (1333), the connecting shaft (1332) is coaxially connected with the gear (1331), the gear (1331) is engaged with the inner gear ring (1322), the connecting shaft (1332) is used for driving the gear (1331) to rotate under the action of an external force, and the locking module (1333) is used for locking or unlocking the connecting shaft (1332) and the mandrel (110).

4. The pole piece web stretching apparatus of claim 3, wherein A first shaft hole (1311) is formed through the first sleeve (131), the central axis of the first shaft hole (1311) is parallel to the central axis of the first sleeve (131), one end of the connecting shaft (1332) is coaxially connected with the gear (1331) through the first shaft hole (1311), the connecting shaft (1332) is rotatably matched with the first shaft hole (1311), and the end of the connecting shaft (1332) away from the gear (1331) is matched with the locking module (1333).

5. The pole piece web stretching apparatus of claim 4, wherein The locking module (1333) comprises a mounting block (1334) and a locking screw (1335), the mounting block (1334) is protruded on the outer sidewall of the mandrel (110), the connecting shaft (1332) passes through the mounting block (1334) and is rotatably matched with the mounting block (1334), and the locking screw (1335) is threadedly matched with the mounting block (1334) and is used for being screwed into the mounting block (1334) to radially abut against the connecting shaft (1332) to lock the connecting shaft (1332).

6. The pole piece web stretching apparatus of claim 4 wherein, The number of the coating area stretching wheels (120) and the blank area stretching wheels (130) is multiple, and the multiple coating area stretching wheels (120) and the multiple blank area stretching wheels (130) are alternately arranged in the axial direction of the mandrel (110). The number of the first shaft holes (1311) penetrating through the first sleeve (131) is multiple, one of the multiple first shaft holes (1311) is used for allowing the corresponding connecting shaft (1332) of the first sleeve (131) to pass through, and the remaining first shaft holes (1311) are used for allowing the corresponding connecting shaft (1332) of the remaining blank area stretching wheels (130) to pass through.

7. The pole piece web stretching apparatus of claim 6, wherein The coating area stretching wheel (120) comprises a second sleeve (121) and a second roller sleeve (122), the second sleeve (121) is coaxially arranged on the outer sidewall of the mandrel (110), and the second roller sleeve (122) is rotatably sleeved on the outer sidewall of the second sleeve (121) and is used for stretching the coating area (210) of the pole piece material belt (200) during rotation around the central axis of the second sleeve (121). A plurality of second shaft holes (1211) are penetratingly arranged on the second sleeve (121), the multiple second shaft holes (1211) are respectively aligned with the multiple first shaft holes (1311), and the multiple second shaft holes (1211) are used for allowing the corresponding connecting shaft (1332) of the multiple blank area stretching wheels (130) to pass through.

8. The pole piece web stretching apparatus of claim 1 wherein, The outer sidewall of the first roller sleeve (134) is flush with the outer sidewall of the coating area stretching wheel (120) at a position closest to the central axis of the first sleeve (131), and the outer sidewall of the first roller sleeve (134) protrudes from the outer sidewall of the coating area stretching wheel (120) at a position farthest from the central axis of the first sleeve (131).

9. The pole piece web stretching apparatus of claim 1 wherein, The first roller sleeve (134) is provided with chamfered inclined surfaces (1341), and the outer sidewall of the first roller sleeve (134) is connected with two end walls through the two chamfered inclined surfaces (1341).

10. A roll press system characterized by, The pole piece material belt stretching device (100) is arranged between the first roller (11) and the second roller (12), and the mandrel (110) is parallel to the first roller (11) and the second roller (12).

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