Tension roller and rolling equipment

Abstract

The utility model relates to the technical field of battery manufacturing, and provides a tension roller and rolling equipment, and the tension roller comprises a roller main body and an extension assembly. At least part of the roller main body is used for being arranged corresponding to a coating area of the battery pole piece; the extension assembly is used for being arranged corresponding to a blank area of the battery pole piece, and the extension assembly is adjustably fixed to the roller body in the axial direction of the roller body so as to be matched with the blank area of the battery pole piece. According to the tension roller and the rolling equipment provided by the embodiment of the invention, by adjusting the position of the extension assembly relative to the roller main body, the tension roller and the rolling equipment can adapt to blank areas of battery pole pieces of different models, teflon does not need to be used, the production time occupied by replacement of the teflon every time is avoided, and the production efficiency can be greatly improved. And the tension roller can be suitable for battery pole pieces of different models, so that the tension roller does not need to be replaced every time, various tension rollers do not need to be prepared to adapt to different blank areas, and the production cost can be reduced.

Description

Technical Field

[0001] The present application relates to the technical field of battery manufacturing, and in particular to a tension roller and rolling equipment. Background Art

[0002] In the related art, when manufacturing the battery pole pieces of the battery device, it is necessary to coat the substrate with slurry to form a coated area coated with slurry and a blank area not coated with slurry. The blank area is used as the pole ear. The battery pole piece is rolled by a rolling device. Since the thickness of the blank area is smaller than that of the coated area, it cannot contact the roller and cannot be effectively extended. After rolling, wrinkles or breaks are prone to appear at the junction of the blank area and the coated area. Usually, Teflon is pasted on the tension roller of the rolling equipment to raise the blank area so that the tension roller can abut the blank area for rolling. However, the sizes of the coating area and the blank area of ​​different models of battery pole pieces are different. During production, Teflon needs to be replaced to adapt to blank areas of different sizes, which increases the cost of use and affects production efficiency. Utility Model Content

[0003] In view of this, the embodiments of the present application hope to provide a tension roller and rolling equipment that can be suitable for processing battery pole pieces of different sizes, reduce production costs, and improve production efficiency.

[0004] A first aspect of an embodiment of the present application provides a tension roller, the tension roller comprising:

[0005] A roller body, at least a portion of which is used to be disposed corresponding to a coating area of ​​a battery electrode sheet;

[0006] The extension component is used to be arranged corresponding to the blank area of ​​the battery pole piece. The extension component is adjustably fixed to the roller body along the axial direction of the roller body to adapt to the blank area of ​​the battery pole piece.

[0007] The tension roller provided in the embodiment of the present application can adapt to the blank area of ​​different types of battery pole pieces by adjusting the position of the extension component relative to the roller body, without the need to use Teflon, thus avoiding the production time occupied by each replacement of Teflon, and greatly improving production efficiency. And because the tension roller can be suitable for different types of battery pole pieces, there is no need to replace the tension roller every time, and there is no need to prepare multiple tension rollers to adapt to different blank areas, which can reduce production costs.

[0008] In some embodiments, the extension assembly includes:

[0009] An intermediate extension assembly is adjustably fixed to the roller body along the axial direction of the roller body, and is used to be arranged corresponding to the central blank area of ​​the battery pole piece;

[0010] The edge extension component is adjustably fixed to the roller body along the axial direction of the roller body, and is used for being arranged corresponding to the edge blank area of ​​the battery pole piece.

[0011] According to the extension size of the blank area and the coating area of ​​the battery plate in the axial direction, the position of the middle extension component relative to the roller body is adjusted, or the position of the edge extension component relative to the roller body is adjusted, or the positions of the middle extension component and the edge extension component relative to the roller body are adjusted at the same time, so that the middle extension component can correspond to the middle blank area, and the edge extension component can correspond to the edge blank area. The relative position of the blank area and the coating area can be adjusted adaptively.

[0012] In some embodiments, the intermediate extension assembly includes two intermediate extension pieces, and the two intermediate extension pieces can be fixed on the roller body along the axial direction of the roller body so as to be close to or far away from each other to adapt to the central blank area of ​​the battery electrode.

[0013] The position of one intermediate extension piece on the roller body can be adjusted, and the positions of two intermediate extension pieces on the roller body can also be adjusted simultaneously, and can be adaptively adjusted according to the relative positions of the blank area and the coating area.

[0014] In some embodiments, the intermediate extension assembly further comprises:

[0015] The driving assembly is used to drive the two intermediate extension members to move closer to or farther from each other along the axial direction of the roller body.

[0016] The middle extension piece is controlled by the driving assembly. When the middle extension piece needs to be adjusted, the driving assembly drives the middle extension piece to move without manually adjusting the movement of the middle extension piece. When rolling is performed, the driving assembly can control the middle extension piece to be fixed on the roller body.

[0017] In some embodiments, the roller body has a hollow structure, an adjustment hole communicating with the hollow structure is provided on the roller body, and the driving assembly includes:

[0018] A power unit connected to the roller body and located in the hollow structure;

[0019] The transmission member is drivingly connected to the power unit, and is passed through the adjustment hole and respectively connected to the two intermediate extension members.

[0020] The power unit is arranged inside the structure of the roller body, so that the structure is compact and interference with the movement of the intermediate extension piece on the roller body can be prevented.

[0021] In some embodiments, the roller body comprises:

[0022] Central axis;

[0023] Two segmented rollers are respectively sleeved on the outside of the two ends of the central shaft, and the two intermediate extension pieces can be fixed on the central shaft along the axial direction of the central shaft so as to be close to or far away from each other, and the two intermediate extension pieces are at least partially sleeved with the corresponding segmented rollers.

[0024] The two segmented rollers are respectively sleeved on the central shaft, and a movable space is formed between the two segmented rollers so that the two intermediate extension members can be fixed on the central shaft after being moved.

[0025] In some embodiments, the intermediate extension comprises:

[0026] A sleeve portion, at least partially sleeved on the corresponding segmented roller;

[0027] An inserting portion connected to the sleeve portion, the inserting portion having a plurality of first teeth spaced apart from each other;

[0028] The first teeth of one intermediate extension piece can be plugged into the first teeth of another intermediate extension piece.

[0029] The sleeve portion is at least partially sleeved on the segmented roller, so that the sleeve portion and the segmented roller are connected to each other to prevent the sleeve portion and the segmented roller from being disconnected in the middle and the disconnected portion from being unable to abut against the battery pole piece.

[0030] In some embodiments, the sleeve portion has a radial thickness of 0.6-0.9 mm.

[0031] In this way, the thickness of the sizing material in different coating areas can be adapted.

[0032] In some embodiments, a chamfer is provided on the upper edge of the end of the sleeve portion, and the chamfer radius is 0.25-0.35 mm.

[0033] In this way, it is possible to reduce the damage caused by the end of the sleeve portion to the coating area.

[0034] In some embodiments, the intermediate extension assembly further comprises:

[0035] The fixing block comprises two rows of a plurality of second teeth spaced apart from each other. The fixing block is connected to the central axis. The first teeth of the two intermediate extensions can be respectively plugged with the second teeth of the corresponding row of the fixing block along the axial direction of the central axis.

[0036] The first teeth and the second teeth are inserted into each other to limit the rotation of the first teeth in the circumferential direction. When the two middle extensions are able to move away from each other along the axial direction of the central axis, the first teeth and the second teeth are arranged at intervals to reduce the area that is not abutted against the middle blank area, thereby improving the rolling effect.

[0037] In some embodiments, the axial length of the fixed block is 22 mm, the axial length of the second tooth is 11 mm, the distance between the fixed block and the two segmented rollers is 11 mm, and the axial length of the intermediate extension piece is 23 mm.

[0038] The axial length of the first tooth of the plug-in part is 11mm. When the first tooth abuts against the second tooth, the overlapping length of the sleeve part on the segmented roller is 1mm, the axial distance between the two intermediate extensions is 0, and the width of the two intermediate extensions is 46mm, which can adapt to the battery pole piece with a middle blank area width greater than 46mm, and the distance between the sleeve part and the coating area of ​​the battery pole piece is greater than 0 and less than or equal to 1mm. The width of the middle blank area that the two intermediate extensions can adapt to gradually increases. Since the distance between the fixed block and the two segmented rollers is 11mm, that is, the axial movement range of the first tooth when the first tooth gradually moves away from the second tooth is 11mm, the maximum width of the two intermediate extensions is 48mm, which can adapt to the battery pole piece with a middle blank area width greater than 68mm, and the distance between the joint and the coating area of ​​the battery pole piece is greater than 0 and less than or equal to 1mm.

[0039] In some embodiments, the width of the first tooth along the circumferential direction is 8-12 mm, and the width of the second tooth along the circumferential direction is 8-12 mm.

[0040] This is to prevent the first tooth and the second tooth from being too small in size and being unable to withstand the roller pressure and being damaged during rolling; or the first tooth and the second tooth from being too large in size, and the number of the first teeth and the second teeth that can be designed along the circumferential direction is limited, affecting the circumferential limiting effect of the second tooth on the first tooth after the first tooth and the second tooth are plugged in.

[0041] In some embodiments, the intermediate extension assembly further comprises:

[0042] The first fixing member is used to fix the intermediate extension member on the central axis.

[0043] The intermediate extension piece can be fixed on the central axis by the first fixing piece, thereby reducing the possibility that the intermediate extension piece will be displaced in the circumferential direction during the rolling operation and thus affect the rolling effect.

[0044] In some embodiments, the intermediate extension member has a first mounting hole, and the first fixing member is a rubber nail; the first fixing member is inserted into the first mounting hole and abuts against the central axis.

[0045] The first fixing member adopts a rubber nail to abut the central axis. The hardness of the rubber nail is relatively low, which can reduce the impact of leaving marks on the central axis when fastening.

[0046] In some embodiments, the adjustment range of the two intermediate extension members is 46 to 68 mm.

[0047] In some embodiments, the edge extension component includes:

[0048] An edge extension piece is adjustably arranged on the roller body along the axial direction of the roller body, and is used to be arranged corresponding to the edge blank area of ​​the battery pole piece;

[0049] The second fixing member is used to fix the edge extension member on the roller body.

[0050] The edge extension piece can be fixed to the roller body, such as a segmented roller, by the second fixing piece to prevent the edge extension piece from being displaced in the circumferential direction during the rolling operation and affecting the rolling effect.

[0051] In some embodiments, the second fixing member is a plastic nail, and the edge extension member includes:

[0052] An abutment portion is adjustably sleeved on the roller body along the axial direction of the roller body, and is used to be arranged corresponding to the edge blank area of ​​the battery electrode sheet;

[0053] The mounting portion has a second mounting hole, the mounting portion is connected to the abutting portion, the radial thickness of the mounting portion is greater than the radial thickness of the abutting portion, and the second fixing member is passed through the second mounting hole and abuts against the roller body.

[0054] The thickness of the mounting portion along the radial direction is greater than the thickness of the abutting portion along the radial direction, which can improve the connection stability of the second fixing member on the edge extension member and facilitate the installation of the second fixing member. The second fixing member uses a rubber nail to abut the roller body, and the hardness of the rubber nail is relatively low, which can reduce the impact of leaving marks when tightening the roller body.

[0055] In some embodiments, the abutment portion has a radial thickness of 0.6-0.9 mm.

[0056] This is to prevent the radial thickness of the abutting portion from being too large, resulting in the roller body being unable to abut the coating area after the abutting portion abuts the edge blank area; or the radial thickness of the abutting portion being too small, resulting in the intermediate extension piece being insufficient to compensate for the height difference between the edge blank area and the coating area, and the intermediate extension piece being unable to abut the edge blank area.

[0057] In some embodiments, a chamfer is provided on the upper edge of the end of the abutting portion, and the chamfer radius is 0.25-0.35 mm.

[0058] In this way, it is possible to reduce the damage to the coating area caused by the end of the abutting portion.

[0059] In some embodiments, a distance between the extension component and the coating area along the axial direction of the roller body is L, and L is greater than 0 and less than or equal to 1 mm.

[0060] In this way, the probability of the extension component hitting the coating area and causing the active material on the coating area to fall off can be reduced.

[0061] A second aspect of an embodiment of the present application provides a rolling device, comprising any of the tension rollers described above.

[0062] In some embodiments, the rolling device further comprises:

[0063] A roller, used for rolling the battery pole piece;

[0064] A guide roller, used for guiding the battery pole piece;

[0065] Wherein, the tension roller can move relative to the guide roller to adjust the tensioning force of the battery electrode sheet.

[0066] The rolling device provided in the embodiment of the present application has the same beneficial effects as the above-mentioned tension roller. BRIEF DESCRIPTION OF THE DRAWINGS

[0067] Figure 1 It is a schematic structural diagram of a tension roller in an embodiment of the present application;

[0068] Figure 2 for Figure 1 A partial exploded schematic diagram of the tension roller shown;

[0069] Figure 3 This is a schematic diagram of the structure of the intermediate extension member in one embodiment of the present application;

[0070] Figure 4 for Figure 3 a front view of the intermediate extension shown;

[0071] Figure 5 This is a schematic structural diagram of a roller body and a fixing block in an embodiment of the present application;

[0072] Figure 6 for Figure 5 The enlarged structural diagram of the roller body and the fixed block at A is shown;

[0073] Figure 7 This is a schematic diagram of the structure of the central axis and the fixed block in one embodiment of the present application;

[0074] Figure 8 This is a schematic diagram of the structure of an edge extension piece in one embodiment of the present application;

[0075] Fig. 9 It is a schematic structural diagram of a rolling device in one embodiment of the present application.

[0076] Description of Reference Numerals

[0077] Tension roller 100; roller body 10; adjustment hole 10a; central axis 11; segmented roller 12; main axis 13; extension assembly 20; intermediate extension assembly 21; intermediate extension piece 211; first mounting hole 211a; sleeve portion 2111; plug-in portion 2112; first tooth 21121; fixing block 213; second tooth 2131; edge extension assembly 22; edge extension piece 221; abutment portion 2211; mounting portion 2212; second mounting hole 2212a; rolling equipment 1000; rolling roller 200; guide roller 300; battery electrode D. DETAILED DESCRIPTION

[0078] The following is a further detailed description of the implementation of the present application in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present application but cannot be used to limit the scope of the present application.

[0079] In the description of the embodiments of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "middle", "edge", "inside", "outside", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present application. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0080] In the description of the embodiments of the present application, it should be noted that, 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 mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0081] In the description of this specification, the description with reference to the terms "some embodiments", "exemplarily", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine different embodiments or examples described in this application and the features of different embodiments or examples without contradiction.

[0082] In the related art, when manufacturing the battery pole piece of the battery device, it is necessary to coat the slurry on the substrate to form a coating area coated with slurry and a blank area not coated with slurry. The blank area is used as the pole ear. The battery pole piece is rolled by a rolling device to compact the battery pole piece, so that the electronic contact between the powder particles of the slurry and between the powder and the substrate is good, and the adhesion between the powder layer and the substrate is improved. Since the coating area can be extended along the MD direction by the roller force during rolling, the MD direction refers to the machine direction (Machine Direction), that is, parallel to the flow direction through the manufacturing equipment. However, the blank area is not subjected to the roller force during rolling, resulting in the blank area not extending. The difference in length of the battery pole piece after rolling the blank area and the coating area causes the battery pole piece to wrinkle and deform, break after rolling, and cannot be rolled up. Usually, Teflon is pasted on the tension roller to raise the blank area so that the tension roller can abut the blank area for rolling. However, different types of battery electrodes have different sizes, and the required coating areas and blank areas have different sizes. During production, Teflon needs to be replaced to adapt to blank areas of different sizes, which increases the cost of use and affects production efficiency.

[0083] In view of this, please refer to Figure 1-Figure 2 The embodiment of the present application provides a tension roller 100, which includes a roller body 10 and an extension component 20. At least part of the roller body 10 is used to correspond to the coating area of ​​the battery pole piece; the extension component 20 is used to correspond to the blank area of ​​the battery pole piece, and the extension component 20 is adjustably fixed to the roller body 10 along the axial direction of the roller body 10 to adapt to the blank area of ​​the battery pole piece. The axial direction of the roller body 10 refers to the direction of the central axis of rotation, as shown by X in the figure.

[0084] The blank area and the coated area of ​​the battery electrode have a thickness difference, and the blank area is thinner. The extension component 20 is used to compensate for the thickness of the blank area so that the tension roller 100 can abut against the blank area for rolling.

[0085] The position of the extension component 20 relative to the roller body 10 can be adjusted. For example, the position of the extension component 20 on the roller body 10 can be adjusted according to the positions of the blank areas and coated areas corresponding to different battery electrodes so that the extension component 20 can correspond to the blank areas.

[0086] Exemplarily, the extension component 20 includes an extension piece for abutting the blank area. One blank area can correspond to one extension piece. Exemplarily, the battery pole piece includes a coating area located in the middle and blank areas located on both sides of the coating area. The extension component 20 includes two extension pieces, and the extension pieces correspond to the blank areas abutting on both sides. When the size of the middle coating area changes along the axial direction, that is, the position of the blank area relative to the roller body 10 changes, the position of the extension piece on the roller body 10 is adjusted so that the roller body 10 between the two extension pieces can correspond to the coating area, and the extension piece can correspond to the blank area. The size of the extension piece along the axial direction X is designed to meet the axial size of the blank areas on both sides of the coating area of ​​most battery pole pieces. When the axial size of the coating area does not change and the axial size of the blank area changes, there is no need to adjust the position of the extension piece on the roller body 10.

[0087] The extension length of the extension component 20 along the axial direction X can also be adjusted by adjusting the relative positions of the extension pieces in the extension component 20 corresponding to the same blank area. For example, the extension component 20 includes two extension pieces, and one blank area corresponds to two extension pieces. By adjusting the relative positions of the two extension pieces, blank areas of different axial sizes can be adapted. The two extension pieces are moved on the roller body 10 and then fixed. The relative positions of the two extension pieces are adjusted to adjust the extension length of the extension component 20 along the axial direction X to correspond to different sizes of different blank areas. For example, the two extension pieces are brought closer to each other to reduce the extension length of the extension component 20 along the axial direction X, or the two extension pieces are moved away from each other to increase the extension length of the extension component 20 along the axial direction X.

[0088] There is no limitation on the manner of driving the extension assembly 20 to adjust the position. The extension assembly 20 may be moved manually or controlled to move by electrical connection.

[0089] The number of extension components 20 is not limited and can be adaptively set according to the number of blank areas and coating areas of the battery pole piece. The blank area includes a middle blank area and an edge blank area, the middle blank area is located between the two coating areas, and the edge blank area is located outside the coating area.

[0090] For example, the battery pole piece has two blank areas and one coating area, and the coating area is located between the two blank areas. Correspondingly, an extension component 20 including two extension pieces is provided, and the extension pieces correspond to the blank areas on both sides, i.e., the edge blank areas. In other embodiments, the battery pole piece has two coating areas and one blank area, and the blank area is located between the coating blank areas, and the blank area is the middle blank area; correspondingly, an extension component 20 is provided corresponding to the middle blank area, and the extension component 20 includes two extension pieces. By adjusting the position of one or two extension pieces on the roller body 10, it can adapt to the middle blank areas with different axial sizes, and can also adapt to the middle blank areas with different positions relative to the coating areas. In other embodiments, the battery pole piece has three blank areas and two coated areas, and the blank areas and the coated areas are arranged in sequence at intervals. Correspondingly, two extension components 20 are provided, wherein one extension component 20 corresponds to the middle blank area, and the extension component 20 includes two extension pieces. By adjusting the position of one or two extension pieces on the roller body 10, it can adapt to the middle blank areas with different axial sizes, and can also adapt to the middle blank areas with different positions relative to the coating areas, wherein the other extension component 20 includes two extension pieces, and the extension pieces correspond to the edge blank areas on both sides.

[0091] Exemplarily, the extension component 20 is used to abut against the surface of the battery pole piece to be flush, so that the extension component can evenly abut against the blank area for rolling.

[0092] Exemplarily, the distance between the extension component 20 and the coating area along the axial direction of the roller body 10 is L, and L is greater than 0 and less than or equal to 1 mm. For example, the distance between the extension component 20 and the coating area along the axial direction of the roller body 10 can be 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm or 1 mm. In this way, the probability of the extension component hitting the coating area and causing the active material on the coating area to fall off can be reduced.

[0093] The tension roller 100 provided in the embodiment of the present application can adapt to the blank area of ​​different types of battery pole pieces by adjusting the position of the extension component 20 relative to the roller body 10, without the need to use Teflon, thus avoiding the production time occupied by each replacement of Teflon, and greatly improving production efficiency. And because the tension roller 100 can be used for different types of battery pole pieces, there is no need to replace the tension roller 100 every time, and there is no need to prepare multiple tension rollers 100 to adapt to different blank areas, which can reduce production costs.

[0094] For some examples, see Figure 1-Figure 2The extension assembly 20 includes a middle extension assembly 21 and an edge extension assembly 22. The middle extension assembly 21 is adjustably fixed to the roller body 10 along the axial direction of the roller body 10, and is used to be set corresponding to the middle blank area of ​​the battery pole piece; the edge extension assembly 22 is adjustably fixed to the roller body 10 along the axial direction of the roller body 10, and is used to be set corresponding to the edge blank area of ​​the battery pole piece.

[0095] The middle blank area is located between the two coating areas, and the two edge blank areas are located outside the two coating areas. According to the extension size of the blank area and the coating area of ​​the battery plate along the axial direction X, the position of the middle extension component 21 relative to the roller body 10 is adjusted, or the position of the edge extension component 22 relative to the roller body 10 is adjusted, or the positions of the middle extension component 21 and the edge extension component 22 relative to the roller body 10 are adjusted at the same time, so that the middle extension component 21 can correspond to the middle blank area, and the edge extension component 22 can correspond to the edge blank area. It can be adaptively adjusted according to the relative position of the blank area and the coating area.

[0096] For some examples, see Figure 1-Figure 4 The middle extension assembly 21 includes two middle extension pieces 211. The two middle extension pieces 211 can be fixed on the roller body 10 along the axial direction X of the roller body 10 so as to be close to or far away from each other to adapt to the middle blank area of ​​the battery pole piece.

[0097] It is understandable that the position of one intermediate extension piece 211 on the roller body 10 can be adjusted, or the positions of two intermediate extension pieces 211 on the roller body 10 can be adjusted simultaneously, and can be adaptively adjusted according to the relative positions of the blank area and the coating area.

[0098] There is no limitation on the manner of driving the intermediate extension member 211 to adjust the position. The intermediate extension member 211 may be moved manually or controlled to move by electrical connection.

[0099] Exemplarily, the middle extension piece 211 includes teeth, and the teeth of the two middle extension pieces 211 mesh with each other. The shape of the teeth is not limited, and can be fan-shaped, triangular or rectangular.

[0100] Exemplarily, the intermediate extension assembly 21 further includes a driving assembly, which is used to drive the two intermediate extension pieces 211 to move closer to or farther from each other along the axial direction X of the roller body 10. The intermediate extension piece 211 is controlled by the driving assembly, and when the intermediate extension piece 211 needs to be adjusted, the driving assembly drives the intermediate extension piece 211 to move, and there is no need to manually adjust the movement of the intermediate extension piece 211. When rolling is performed, the driving assembly can control the intermediate extension piece 211 to be fixed on the roller body 10.

[0101] The number of drive components and is not limited. One drive component can be set to control two intermediate extensions 211, or two drive components can be set, each drive component controls one intermediate extension 211 respectively.

[0102] In some embodiments, the roller body 10 has a hollow structure, and an adjustment hole 10a connected to the hollow structure is provided on the roller body 10, and the driving assembly includes a power unit and a transmission member. The power unit is connected to the roller body 10 and is located in the hollow structure; the transmission member is drivingly connected to the power unit, and is provided through the adjustment hole 10a and is respectively connected to the two middle extension members 211.

[0103] The power unit is arranged inside the structure of the roller body 10, so that the structure is compact and can prevent interference with the movement of the intermediate extension piece 211 on the roller body 10. The movement state of the intermediate extension piece 211 is controlled by the power unit. When the rolling work is performed, the power unit can control the intermediate extension piece 211 to be fixed on the roller body 10. When the intermediate extension piece 211 needs to be adjusted, the power unit drives the transmission member to drive one or two intermediate extension pieces 211 to move.

[0104] Exemplarily, the power unit may be a motor, which drives the transmission member to drive one or two intermediate extension members 211 to move along the axial direction X of the roller body 10. The power unit may also be a cylinder.

[0105] For some examples, see Figure 2 The roller body 10 includes a central shaft 11 and two segmented rollers 12. The two segmented rollers 12 are respectively sleeved outside the two ends of the central shaft 11, and the two intermediate extensions 211 can be fixed on the central shaft 11 along the axial direction X of the central shaft 11 to be close to or away from each other, and the two intermediate extensions 211 are at least partially sleeved with the corresponding segmented rollers 12.

[0106] The two segmented rollers 12 are respectively sleeved on the central shaft 11 , and a movable space is formed between the two segmented rollers 12 so that the two intermediate extension members 211 can be fixed on the central shaft 11 after being moved.

[0107] In some embodiments, the central axis 11 and the two segmented rollers 12 remain relatively fixed, and the axial size of the portion where the intermediate extension piece 211 and the segmented rollers 12 are sleeved can change. When the intermediate extension piece 211 moves, the segmented rollers 12 will not move relative to the central axis 11 with the intermediate extension piece 211.

[0108] Exemplarily, the segmented roller 12 is flush with the surface of the battery electrode sheet so that the segmented roller 12 can evenly abut against the coating area of ​​the battery electrode sheet.

[0109] Exemplarily, the roller body 10 further includes a main shaft 13 (see Figure 1), the main shaft 13 is fixedly connected to the roller body 10. The main shaft 13 and the roller body 10 can be connected in such a way that the main shaft 13 is divided into two sections, which are respectively connected to the two ends of the roller body 10; or, the central shaft 11 and the two segmented rollers 12 are sleeved and fixed on the main shaft 13; or, the main shaft 13 is divided into two sections, which are respectively fixedly connected to the corresponding segmented rollers 12. Exemplarily, the roller body 10, the central shaft 11 or the two segmented rollers 12 and the main shaft 13 can be connected by threaded connection, key connection or snap ring connection.

[0110] Exemplarily, an adjustment hole 10 a communicating with the hollow structure is formed on the central shaft 11 .

[0111] For some examples, see Figure 3-Figure 4 The intermediate extension piece 211 includes a sleeve portion 2111 and an inserting portion 2112. The sleeve portion 2111 is at least partially sleeved on the corresponding segmented roller 12; the inserting portion 2112 is connected to the sleeve portion 2111, and has a plurality of spaced first teeth 21121 on the inserting portion 2112; wherein the first teeth 21121 of one intermediate extension piece 211 can be inserted with the first teeth 21121 of another intermediate extension piece 211.

[0112] The sleeve portion 2111 is at least partially sleeved on the segmented roller 12, so that the sleeve portion 2111 and the segmented roller 12 are connected to each other to prevent the sleeve portion 2111 and the segmented roller 12 from being disconnected in the middle and the disconnected portion cannot abut against the battery electrode.

[0113] Exemplarily, when the two intermediate extension members 211 move away from each other, the central shaft 11 and the segmented roller 12 remain stationary, and the two intermediate extension members 211 move relative to the central shaft 11 and the segmented roller 12 .

[0114] Exemplarily, the sleeve portion 2111 is at least partially sleeved on the segmented roller 12, and the plug-in portion 2112 is sleeved on the central shaft 11, and the sleeve portion 2111 and the plug-in portion 2112 are flush with the surface of the battery electrode.

[0115] In some embodiments, the sleeve portion 2111 has a radial thickness of 0.6-0.9 mm.

[0116] Exemplarily, the radial thickness of the sleeve portion 2111 may be 0.6 mm, 0.62 mm, 0.65 mm, 0.68 mm, 0.7 mm, 0.72 mm, 0.75 mm, 0.78 mm, 0.8 mm, 0.82 mm, 0.85 mm, 0.88 mm or 0.9 mm, etc., to adapt to the thickness of the slurry on different coating areas.

[0117] In some embodiments, the upper edge of the end of the sleeve portion 2111 is chamfered, and the chamfer radius is 0.25-0.35 mm. The upper edge of the end of the sleeve portion 2111 refers to the upper edge of the end close to the coating area. Exemplarily, the chamfer radius of the upper edge of the end of the sleeve portion 2111 can be 0.25mm, 0.26mm, 0.27mm, 0.28mm, 0.29mm, 0.3mm, 0.31mm, 0.32mm, 0.33mm, 0.34mm or 0.35mm, so that the end of the sleeve portion 2111 can reduce damage to the coating area.

[0118] For some examples, see Figure 2-Figure 7 The intermediate extension assembly 21 further includes a fixed block 213, including two rows of multiple second teeth 2131 spaced apart from each other. The fixed block 213 is connected to the central shaft 11. The first teeth 21121 of the two intermediate extensions 211 can be respectively plugged with the second teeth 2131 of the corresponding row of the fixed block 213 along the axial direction of the central shaft 11. The axial direction of the central shaft 11 refers to the direction of the central axis of rotation, which is consistent with the axial direction of the roller body 10, as shown by X in the figure.

[0119] The first teeth 21121 and the second teeth 2131 are flush with the surface of the middle blank area, so that the middle extension component 21 can evenly abut against the middle blank area for rolling.

[0120] The two rows of second teeth 2131 correspond to the two middle extension pieces 211 respectively, and the rotation of the first teeth 21121 along the circumferential direction can be limited by plugging the first teeth 21121 and the second teeth 2131. In addition, by adopting the form of plugging, when the two middle extension pieces 211 can move away from each other along the axial direction X of the central axis 11, the first teeth 21121 and the second teeth 2131 arranged at intervals can reduce the area that is not abutted against the middle blank area, thereby improving the rolling effect.

[0121] The circumferential direction refers to the circumferential direction along the outer contour of the fixing block 213 .

[0122] It is understandable that by reasonably designing the dimensions of the first teeth 21121, the second teeth 2131 and the distance between the fixed block 213 and the two segmented rollers 12, the width range of the blank area in the middle of the battery pole piece that the two middle extensions 211 are adapted to can be adjusted.

[0123] Exemplarily, the fixing block 213 and the central shaft 11 are integrally formed, which can improve the structural strength of the fixing block 213 and the central shaft 11 to prevent the fixing block 213 from being separated from the central shaft 11 under the roller pressure during the rolling operation.

[0124] When the intermediate extension components 21 are not provided with the fixing block 213, the first teeth 21121 of the two intermediate extension components 21 can be directly plugged and meshed. For example, when the two intermediate extension components 211 are closest to each other, the first teeth 21121 of the two intermediate extension components 21 can be completely plugged and meshed, and no vacant space is left between adjacent first teeth 21121. When the two intermediate extension components 211 are farthest apart, there is an empty space between adjacent first teeth 21121, and the first teeth 21121 of the two intermediate extension components 211 can be at least partially plugged and meshed, so as to facilitate the plug-in movement of the two intermediate extension components 211 and reduce the possibility of interference caused by misaligned plug-in.

[0125] Exemplarily, the first tooth 21121 and the second tooth 2131 have the same shape and size, and the second tooth 2131 of the fixed block 213 is equivalent to cutting off half of the first tooth 21121 and leaving it on the central axis 11, so that the first tooth 21121 and the second tooth 2131 are plugged into and engaged with each other to abut against the blank area in the middle.

[0126] In some embodiments, the adjustment range of the two middle extension pieces 211 is 46-68 mm. That is, the length range of the two middle extension pieces 211 along the axial direction X of the roller body 10 is 46-68 mm, and the middle blank area of ​​the corresponding width size can be adapted when the distance between the extension component and the axial direction X of the coating area roller body 10 is greater than 0 and does not exceed 1 mm.

[0127] For example, see Figure 3-Figure 6 The length D1 of the fixed block 213 along the axial direction X of the central axis 11 is 22 mm, the length D2 of the second tooth 2131 along the axial direction X of the central axis 11 is 11 mm, the distance D3 between the fixed block 213 and the two segmented rollers 12 is 11 mm, and the length D4 of the intermediate extension piece 211 along the axial direction X of the central axis 11 is 23 mm.

[0128] The length D5 of the first tooth 21121 of the plug-in portion 2112 along the axial direction is 11 mm. When the first tooth 21121 abuts against the second tooth 2131, the overlapping length of the sleeve portion 2111 sleeved on the segmented roller 12 is 1 mm, the distance between the two intermediate extensions 211 along the axial direction is 0, and the width of the two intermediate extensions 211 is 46 mm, which can adapt to the battery pole piece with a width of the middle blank area greater than 46 mm. The distance between the sleeve portion 2111 and the coating area of ​​the battery pole piece is greater than 0 and less than or equal to 1 mm. At this time, the first tooth 21121 and the second tooth 2131 are spliced ​​along the circumferential direction to form a ring, and the two intermediate extensions 211 and the two rows of second teeth 2131 are spliced ​​to form a complete plane. As the two intermediate extension pieces 211 gradually move away from each other in the axial direction, the width of the middle blank area that the two intermediate extension pieces 211 can adapt to gradually increases. Since the distance between the fixed block 213 and the two segmented rollers 12 is 11 mm, that is, when the first tooth 21121 gradually moves away from the second tooth 2131, the axial movement range of the first tooth 21121 is 11 mm. The maximum width of the two intermediate extension pieces 211 is 48 mm, which can adapt to the battery pole piece with a middle blank area width greater than 68 mm. The distance between the sleeve portion 2111 and the coating area of ​​the battery pole piece is greater than 0 and less than or equal to 1 mm.

[0129] For some examples, see Figure 3-Figure 6 , the circumferential width H1 of the first tooth 21121 is 8-12 mm, and the circumferential width H2 of the second tooth 2131 is 8-12 mm. Exemplarily, the circumferential width of the first tooth 21121 may be 8 mm, 9 mm, 10 mm, 11 mm or 12 mm. Exemplarily, the circumferential width of the second tooth 2131 may be 8 mm, 9 mm, 10 mm, 11 mm or 12 mm. In order to prevent the first tooth 21121 and the second tooth 2131 from being too small in size and being damaged by the roller pressure during rolling; or the first tooth 21121 and the second tooth 2131 are too large in size, the number of the first tooth 21121 and the second tooth 2131 that can be designed in the circumferential direction is limited, which affects the limiting effect of the second tooth 2131 on the first tooth 21121 in the circumferential direction after the first tooth 21121 and the second tooth 2131 are plugged in.

[0130] The widths of the first tooth 21121 and the second tooth 2131 along the circumferential direction may be the same or different. For example, the width of the first tooth 21121 and the width of the second tooth 2131 along the circumferential direction are the same, both of which are 10 mm.

[0131] It can be understood that when the surfaces of the first tooth 21121 and the second tooth 2131 facing the battery electrode are flat or arc-shaped surfaces, the width of the first tooth 21121 along the circumferential direction refers to the chord length of the arc on the circumference.

[0132] In some embodiments, the intermediate extension assembly 21 further includes a first fixing member for fixing the intermediate extension member 211 to the central shaft 11. The intermediate extension member 211 can be fixed to the central shaft 11 by the first fixing member, thereby reducing the possibility of the intermediate extension member 211 being displaced in the circumferential direction during the rolling operation and affecting the rolling effect.

[0133] Exemplarily, the first fixing member fixes the intermediate extension member 211 on the first tooth 21121, and the radial thickness of the first tooth 21121 is greater than the radial thickness of the sleeve portion 2111, which can reduce the impact of the first fixing member on the structural strength of the intermediate extension member 211 and facilitate the installation of the first fixing member. Exemplarily, the intermediate extension component 21 includes a first fixing member and a driving component, and the first fixing member is removed before the driving component drives the intermediate extension member 211 to move. Or when the intermediate extension component 21 is installed with the driving component, the first fixing member is not installed, and the intermediate extension member 211 is controlled by the driving component. When rolling is performed, the driving component can control the intermediate extension member 211 to be fixed on the roller body 10.

[0134] For some examples, see Figure 2 and Figure 3 The middle extension 211 has a first mounting hole 211a, and the first fixing member is a plastic nail; the first fixing member is passed through the first mounting hole 211a and abuts against the central axis 11. The first fixing member abuts against the central axis 11 with a plastic nail, and the hardness of the plastic nail is relatively low, which can reduce the impact of leaving marks when tightening the central axis 11.

[0135] Exemplarily, the first mounting hole 211a is disposed on the first tooth 21121. The radial thickness of the first tooth 21121 is greater than the radial thickness of the sleeve portion 2111, which can improve the connection stability of the glue nail on the middle extension 211 and facilitate the installation of the glue nail.

[0136] For some examples, see Figure 2 and Figure 8 The edge extension assembly 22 includes an edge extension piece 221 and a second fixing piece. The edge extension piece 221 is adjustably arranged on the roller body 10 along the axial direction X of the roller body 10, and is used to be arranged corresponding to the edge blank area of ​​the battery electrode sheet; the second fixing piece is used to fix the edge extension piece 221 on the roller body 10.

[0137] The edge extension member 221 can be fixed to the roller body 10 , such as the segmented roller 12 , by the second fixing member, so as to prevent the edge extension member 221 from being displaced in the circumferential direction during the rolling operation and affecting the rolling effect.

[0138] Exemplarily, each edge extension piece 221 corresponds to an edge blank area.

[0139] Among them, the axial dimension of the edge extension piece 221 is designed to meet the axial dimension of the edge blank area of ​​most battery electrodes. When the axial dimension of the coating area does not change and the axial dimension of the edge blank area changes, there is no need to adjust the position of the edge extension piece 221 on the roller body 10.

[0140] Exemplarily, the sizes of the two edge extensions 221 can be the same or different. When the sizes of the two edge extensions 221 along the axial direction are the same, it is convenient for one-time batch production. When the sizes of the two edge extensions 221 along the axial direction are different, it can adapt to different edge blank area size ranges.

[0141] For some examples, see Figure 2 and Figure 8 The second fixing member is a rubber nail, and the edge extension member 221 includes an abutting portion 2211 and a mounting portion 2212. The abutting portion 2211 is adjustably sleeved on the roller body 10 along the axial direction X of the roller body 10, and is used to be set corresponding to the edge blank area of ​​the battery electrode; the mounting portion 2212 has a second mounting hole 2212a, the mounting portion 2212 is connected to the abutting portion 2211, the thickness of the mounting portion 2212 along the radial direction is greater than the thickness of the abutting portion 2211 along the radial direction, and the second fixing member is passed through the second mounting hole 2212a and abuts against the roller body 10.

[0142] The radial thickness of the mounting portion 2212 is greater than the radial thickness of the abutting portion 2211, which can improve the connection stability of the second fixing member on the edge extension member 221, and facilitate the installation of the second fixing member. The second fixing member uses a rubber nail to abut the roller body 10, and the hardness of the rubber nail is relatively low, which can reduce the impact of leaving marks when the roller body 10 is tightened.

[0143] In some embodiments, the thickness of the abutting portion 2211 along the radial direction is 0.6-0.9 mm. For example, the thickness of the abutting portion 2211 along the radial direction can be 0.6 mm, 0.62 mm, 0.65 mm, 0.68 mm, 0.7 mm, 0.72 mm, 0.75 mm, 0.78 mm, 0.8 mm, 0.82 mm, 0.85 mm, 0.88 mm or 0.9 mm, etc., to adapt to the thickness of the slurry on different coating areas.

[0144] In some embodiments, the upper edge of the end of the abutting portion 2211 is chamfered, and the chamfer radius is 0.25-0.35 mm.

[0145] Exemplarily, the chamfer radius set on the upper edge of the end of the abutment portion 2211 can be 0.25mm, 0.26mm, 0.27mm, 0.28mm, 0.29mm, 0.30mm, 0.31mm, 0.32mm, 0.33mm, 0.34mm or 0.35mm. In this way, the damage caused by the end of the abutment portion 2211 to the coating area can be reduced.

[0146] In some embodiments, the thickness of the abutting portion 2211 along the radial direction is 0.6-0.9 mm, and the upper edge of the end of the abutting portion 2211 is chamfered, and the chamfer radius is 0.25-0.35 mm.

[0147] The present application also provides a rolling device 1000, see Fig. 9 , including the tension roller 100 of any one of the embodiments of the present application. The tension roller 100 can be used as a fixed roller to guide the battery pole piece D, and can also be used as a non-fixed roller to adjust the tension of the battery pole piece D.

[0148] For some examples, see Fig. 9 The rolling device 1000 further includes a roller 200 and a guide roller 300. The roller 200 is used to roll the battery pole piece; the guide roller 300 is used to guide the battery pole piece D; wherein the tension roller 100 can move relative to the guide roller 300 to adjust the tension of the battery pole piece D.

[0149] For some examples, see Figure 1-Figure 9The tension roller 100 includes a roller body 10 and an extension component 20. At least part of the roller body 10 is used to correspond to the coating area of ​​the battery pole piece; the extension component 20 is used to correspond to the blank area of ​​the battery pole piece, and the extension component 20 is adjustably fixed to the roller body 10 along the axial direction of the roller body 10 to adapt to the blank area of ​​the battery pole piece. The distance between the extension component 20 and the coating area along the axial direction of the roller body 10 is L, and L is equal to 0.5mm. The extension component 20 includes an intermediate extension component 21 and an edge extension component 22. The intermediate extension component 21 is adjustably fixed to the roller body 10 along the axial direction of the roller body 10, and is used to correspond to the middle blank area of ​​the battery pole piece; the edge extension component 22 is adjustably fixed to the roller body 10 along the axial direction of the roller body 10, and is used to correspond to the edge blank area of ​​the battery pole piece. The intermediate extension assembly 21 includes two intermediate extension pieces 211, which can be fixed on the roller body 10 close to or away from each other along the axial direction X of the roller body 10 to adapt to the middle blank area of ​​the battery pole piece. The roller body 10 includes a central shaft 11 and two segmented rollers 12. The two segmented rollers 12 are respectively sleeved on the outside of the two ends of the central shaft 11, and the two intermediate extension pieces 211 can be fixed on the central shaft 11 close to or away from each other along the axial direction X of the central shaft 11, and the two intermediate extension pieces 211 are at least partially sleeved with the corresponding segmented rollers 12. The intermediate extension piece 211 includes a sleeve portion 2111 and a plug-in portion 2112. The sleeve portion 2111 is at least partially sleeved on the corresponding segmented roller 12; the plug-in portion 2112 is connected to the sleeve portion 2111, and has a plurality of spaced first teeth 21121 on the plug-in portion 2112; wherein the first teeth 21121 of one intermediate extension piece 211 can be plugged with the first teeth 21121 of another intermediate extension piece 211. The sleeve portion 2111 has a radial thickness of 0.6-0.9 mm. The upper edge of the end of the sleeve portion 2111 is chamfered, and the chamfer radius is 0.3 mm. The intermediate extension assembly 21 also includes a fixed block 213, including two rows of multiple second teeth 2131 spaced apart, the fixed block 213 is connected to the central shaft 11, and the first teeth 21121 of the two intermediate extension pieces 211 can be plugged with the second teeth 2131 of the corresponding row of the fixed block 213 along the axial direction of the central shaft 11. The adjustment range of the two intermediate extension pieces 211 is 46-68 mm. The length D1 of the fixing block 213 along the axial direction X of the central axis 11 is 22 mm, the length D2 of the second tooth 2131 along the axial direction X of the central axis 11 is 11 mm, the distance D3 between the fixing block 213 and the two segmented rollers 12 is 11 mm, and the length D4 of the intermediate extension piece 211 along the axial direction X of the central axis 11 is 23 mm. The width H1 of the first tooth 21121 along the circumferential direction is 10 mm, and the width H2 of the second tooth 2131 along the circumferential direction is 10 mm. The intermediate extension assembly 21 also includes a first fixing piece for fixing the intermediate extension piece 211 to the central axis 11.The middle extension piece 211 has a first mounting hole 211a, and the first fixing piece is a rubber nail; the first fixing piece is inserted through the first mounting hole 211a and abuts against the central axis 11. The edge extension assembly 22 includes an edge extension piece 221 and a second fixing piece. The edge extension piece 221 is adjustably arranged on the roller body 10 along the axial direction X of the roller body 10, and is used to be arranged corresponding to the edge blank area of ​​the battery electrode; the second fixing piece is used to fix the edge extension piece 221 on the roller body 10. The second fixing piece is a rubber nail, and the edge extension piece 221 includes an abutting portion 2211 and a mounting portion 2212. The abutting portion 2211 is adjustably sleeved on the roller body 10 along the axial direction X of the roller body 10, and is used to be set corresponding to the edge blank area of ​​the battery electrode; the mounting portion 2212 has a second mounting hole 2212a, the mounting portion 2212 is connected to the abutting portion 2211, the thickness of the mounting portion 2212 along the radial direction is greater than the thickness of the abutting portion 2211 along the radial direction, and the second fixing member is passed through the second mounting hole 2212a and abuts against the roller body 10. The thickness of the abutting portion 2211 along the radial direction is 0.6~0.9mm. The upper edge of the end of the abutting portion 2211 is chamfered, and the chamfer radius is 0.3mm.

[0150] In this embodiment, by adjusting the position of the extension component 20 relative to the roller body 10, the blank area of ​​different types of battery pole pieces can be adapted, and Teflon does not need to be used, which avoids the production time occupied by each replacement of Teflon, and can greatly improve production efficiency. And because the tension roller 100 can be suitable for different types of battery pole pieces, there is no need to replace the tension roller 100 every time, and there is no need to prepare multiple tension rollers 100 to adapt to different blank areas, which can reduce production costs. The distance between the extension component 20 and the coating area along the axial direction of the roller body 10 is 0.5mm, which can reduce the probability of the extension component hitting the coating area and causing the active material on the coating area to fall off. According to the extension size of the blank area and the coating area of ​​the battery pole piece along the axial direction X, adjust the position of the middle extension component 21 relative to the roller body 10, or adjust the position of the edge extension component 22 relative to the roller body 10, or adjust the position of the middle extension component 21 and the edge extension component 22 relative to the roller body 10 at the same time, so that the middle extension component 21 can correspond to the middle blank area, and the edge extension component 22 can correspond to the edge blank area. The position of one intermediate extension piece 211 on the roller body 10 can be adjusted, and the positions of two intermediate extension pieces 211 on the roller body 10 can also be adjusted at the same time, and can be adaptively adjusted according to the relative positions of the blank area and the coating area. The two segmented rollers 12 are respectively sleeved on the central shaft 11, and a movable space is formed between the two segmented rollers 12, so that the two intermediate extension pieces 211 can be fixed on the central shaft 11 after moving. The sleeve part 2111 is at least partially sleeved on the segmented roller 12, so that the sleeve part 2111 and the segmented roller 12 are connected to each other to avoid the sleeve part 2111 and the segmented roller 12 being disconnected in the middle and the disconnected part cannot abut the battery pole piece. The thickness of the sleeve part 2111 in the radial direction is 0.6~0.9mm to adapt to the thickness of the slurry on different coating areas. The upper edge of the end of the sleeve part 2111 is chamfered, and the chamfer radius is 0.3mm, which can reduce the damage caused by the end of the sleeve part 2111 to the coating area. The second teeth 2131 in the row correspond to the two middle extension pieces 211 respectively, and the first teeth 21121 and the second teeth 2131 are plugged in to limit the rotation of the first teeth 21121 in the circumferential direction. In addition, when the two middle extension pieces 211 can move away from each other along the axial direction X of the central axis 11, the first teeth 21121 and the second teeth 2131 arranged at intervals can reduce the area not abutting against the middle blank area, thereby improving the rolling effect. The length D5 of the first teeth 21121 of the plug-in portion 2112 along the axial direction is 11 mm. When the first tooth 21121 abuts against the second tooth 2131, the overlapping length of the sleeve portion 2111 on the segmented roller 12 is 1 mm, the axial distance between the two middle extension pieces 211 is 0, and the width of the two middle extension pieces 211 is 46 mm, which can accommodate battery electrodes with a middle blank area width greater than 46 mm, and the distance between the sleeve portion 2111 and the coating area of ​​the battery electrode is greater than 0 and less than or equal to 1 mm.At this time, the first tooth 21121 and the second tooth 2131 are spliced ​​circumferentially to form a ring, and the two intermediate extensions 211 and the two rows of second teeth 2131 are spliced ​​to form a complete plane. As the two intermediate extensions 211 gradually move away from each other in the axial direction, the width of the intermediate blank area that the two intermediate extensions 211 can adapt to gradually increases. Since the distance between the fixed block 213 and the two segmented rollers 12 is 11 mm, that is, when the first tooth 21121 gradually moves away from the second tooth 2131, the axial movement range of the first tooth 21121 is 11 mm, and the maximum width of the two intermediate extensions 211 is 68 mm, which can adapt to the battery pole piece with a width of the intermediate blank area greater than 68 mm. The distance between the sleeve 2111 and the coating area of ​​the battery pole piece is greater than 0 and less than or equal to 1 mm. The circumferential width H1 of the first tooth 21121 is 10 mm, and the circumferential width H2 of the second tooth 2131 is 10 mm. In order to prevent the first teeth 21121 and the second teeth 2131 from being too small in size and being damaged by the roller pressure during rolling; or the first teeth 21121 and the second teeth 2131 are too large in size, the number of the first teeth 21121 and the second teeth 2131 that can be designed to be limited in the circumferential direction affects the limiting effect of the second teeth 2131 on the first teeth 21121 in the circumferential direction after the first teeth 21121 and the second teeth 2131 are plugged in. The middle extension piece 211 can be fixed to the central shaft 11 by the first fixing piece, reducing the possibility that the middle extension piece 211 will be displaced in the circumferential direction during the rolling operation and affect the rolling effect. The first fixing piece uses a rubber nail to abut the central shaft 11. The hardness of the rubber nail is relatively low, which can reduce the impact of leaving marks when tightening the central shaft 11. The edge extension piece 221 can be fixed to the segmented roller 12 by the second fixing piece, so as to prevent the edge extension piece 221 from being displaced in the circumferential direction during the rolling operation and affecting the rolling effect. The radial thickness of the mounting portion 2212 is greater than the radial thickness of the abutment portion 2211, which can reduce the impact of the second fixing member on the structural strength of the edge extension member 221 and facilitate the installation of the second fixing member. The second fixing member uses a rubber nail to abut the roller body 10. The hardness of the rubber nail is relatively low, which can reduce the impact of leaving marks when the roller body 10 is tightened. The radial thickness of the abutment portion 2211 is 0.6~0.9mm to adapt to the thickness of the slurry on different coating areas. The upper edge of the end of the abutment portion 2211 is chamfered, and the chamfer radius is 0.3mm, which can reduce the damage caused by the end of the abutment portion 2211 to the coating area.

[0151] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A tension roller, characterized in that: The tension roller comprises: A roller body, at least a portion of which is used to be disposed corresponding to a coating area of ​​a battery electrode sheet; The extension component is used to be arranged corresponding to the blank area of ​​the battery pole piece. The extension component is adjustably fixed to the roller body along the axial direction of the roller body to adapt to the blank area of ​​the battery pole piece.

2. The tension roller according to claim 1, characterized in that: The extension assembly comprises: An intermediate extension assembly is adjustably fixed to the roller body along the axial direction of the roller body, and is used to be arranged corresponding to the intermediate blank area of ​​the battery pole piece; The edge extension component is adjustably fixed to the roller body along the axial direction of the roller body, and is used for being arranged corresponding to the edge blank area of ​​the battery pole piece.

3. The tension roller according to claim 2, characterized in that: The intermediate extension assembly includes two intermediate extension pieces, and the two intermediate extension pieces can be fixed on the roller body along the axial direction of the roller body so as to be close to or far away from each other to adapt to the intermediate blank area of ​​the battery pole piece.

4. The tension roller according to claim 3, characterized in that: The intermediate extension assembly also includes: The driving assembly is used to drive the two intermediate extension members to move closer to or farther from each other along the axial direction of the roller body.

5. The tension roller according to claim 4, characterized in that: The roller body has a hollow structure, and an adjustment hole communicating with the hollow structure is provided on the roller body. The driving assembly includes: A power unit connected to the roller body and located in the hollow structure; The transmission member is drivingly connected to the power unit, and is passed through the adjustment hole and respectively connected to the two intermediate extension members.

6. The tension roller according to claim 3, characterized in that: The roller body comprises: Central axis; Two segmented rollers are respectively sleeved on the outside of the two ends of the central shaft, and the two intermediate extension pieces can be fixed on the central shaft along the axial direction of the central shaft so as to be close to or far away from each other, and the two intermediate extension pieces are at least partially sleeved with the corresponding segmented rollers.

7. The tension roller according to claim 6, characterized in that: The intermediate extension member comprises: A sleeve portion, at least partially sleeved on the corresponding segmented roller; A plug-in portion connected to the sleeve portion, the plug-in portion having a plurality of first teeth spaced apart; The first teeth of one intermediate extension piece can be plugged into the first teeth of another intermediate extension piece.

8. The tension roller according to claim 7, characterized in that: The sleeve portion has a radial thickness of 0.6-0.9 mm; and / or, The upper edge of the end of the sleeve portion is chamfered, and the chamfer radius is 0.25-0.35 mm.

9. The tension roller according to claim 7, characterized in that: The intermediate extension assembly also includes: The fixing block comprises two rows of a plurality of second teeth spaced apart from each other. The fixing block is connected to the central axis. The first teeth of the two intermediate extensions can be respectively plugged with the second teeth of the corresponding row of the fixing block along the axial direction of the central axis.

10. The tension roller according to claim 9, characterized in that: The axial length of the fixing block along the central axis is 22 mm, the axial length of the second tooth along the central axis is 11 mm, the distance between the fixing block and the two segmented rollers is 11 mm, and the axial length of the intermediate extension along the central axis is 23 mm; and / or, The width of the first tooth along the circumferential direction is 8-12 mm, and the width of the second tooth along the circumferential direction is 8-12 mm.

11. The tension roller according to claim 6, characterized in that: The intermediate extension assembly also includes: The first fixing member is used to fix the intermediate extension member on the central axis.

12. The tension roller according to claim 11, characterized in that: The middle extension piece has a first mounting hole, and the first fixing piece is a rubber nail; The first fixing member is inserted into the first mounting hole and abuts against the central axis.

13. The tension roller according to claim 3, characterized in that: The adjustment range of the two intermediate extensions is 46~68mm.

14. The tension roller according to claim 2, characterized in that: The edge extension component comprises: An edge extension piece is adjustably arranged on the roller body along the axial direction of the roller body, and is used to be arranged corresponding to the edge blank area of ​​the battery pole piece; The second fixing member is used to fix the edge extension member on the roller body.

15. The tension roller according to claim 14, characterized in that: The second fixing member is a plastic nail, and the edge extension member includes: An abutment portion is adjustably sleeved on the roller body along the axial direction of the roller body, and is used to be arranged corresponding to the edge blank area of ​​the battery electrode sheet; The mounting portion has a second mounting hole, the mounting portion is connected to the abutting portion, the radial thickness of the mounting portion is greater than the radial thickness of the abutting portion, and the second fixing member is passed through the second mounting hole and abuts against the roller body.

16. The tension roller according to claim 15, characterized in that: The thickness of the abutting portion in the radial direction is 0.6-0.9 mm; and / or, The upper edge of the end of the abutting portion is chamfered, and the chamfer radius is 0.25-0.35 mm.

17. The tension roller according to claim 1, characterized in that: A distance between the extension component and the coating area along the axial direction of the roller body is L, and L is greater than 0 and less than or equal to 1 mm.

18. A rolling device, characterized in that: include: A tension roller as claimed in any one of claims 1 to 17.

19. The rolling device according to claim 18, characterized in that The rolling device also includes: A roller, used for rolling the battery pole piece; A guide roller, used for guiding the battery pole piece; Wherein, the tension roller can move relative to the guide roller to adjust the tensioning force of the battery electrode sheet.

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