Pole piece rolling device

Abstract

The utility model provides a pole piece rolling device which comprises a traction assembly, a compression roller assembly and a stretching assembly, the traction assembly at least comprises a traction roller used for pulling a pole piece, the compression roller assembly is arranged on the downstream of the traction assembly and used for rolling the pole piece, and the stretching assembly is arranged between the traction assembly and the compression roller assembly. The stretching assembly comprises a support and a stretching roller and a heating piece which are movably arranged on the support, the stretching roller can move towards or away from the pole piece in the height direction of the support, the heating piece is used for heating a tab of the pole piece, and the stretching roller is used for rolling and flattening the tab. According to the pole piece rolling device provided by the utility model, the stretching rolling path and the heating piece are arranged between the traction assembly and the compression roller assembly, and the stretching roller can move towards or away from a pole lug, so that the stretching amplitude can be adjusted; the problem that the production efficiency is affected due to the fact that the tab stretching amplitude is inconvenient to control in the tab production process in the prior art is solved.

Description

Technical Field

[0001] The utility model relates to the technical field related to batteries, and in particular to a pole piece rolling device. Background Art

[0002] With the development of new energy technologies, battery technology is constantly improving. Currently, during battery manufacturing, especially during the pole sheet rolling process, the rollers primarily compact the material area. This pressure causes the foil to stretch longitudinally. However, during rolling, the thinner thickness of the remaining foil area prevents stress and stretching. As a result, the material area is longer longitudinally and the remaining foil area is shorter, leading to overall pole sheet warping and wrinkles at the tab edges.

[0003] In the prior art, the tab wrinkles are mostly addressed by applying Teflon or setting protrusions on the pressing roller to stretch the tab. However, the roller pressing structure in the prior art is not convenient for controlling the stretching amplitude during the tab stretching process, which leads to repeated stretching when the stretching amplitude is small, increasing the workload; if the stretching amplitude is too large, the tab is prone to cracking, which may seriously cause the problem of tape breakage; the current inconvenience in tab stretching affects the progress of product sample preparation and the quality rate.

[0004] From the above, it can be seen that in the current tab production process, there is a problem that the tab stretching amplitude is difficult to control, which affects production efficiency. Utility Model Content

[0005] The main purpose of the present application is to provide a pole piece rolling device to solve the problem in the prior art of the pole tab production process that the pole tab stretching amplitude is inconvenient to control, which affects the production efficiency.

[0006] In order to achieve the above-mentioned purpose, according to one aspect of the utility model, a pole piece rolling device is provided, which includes a traction assembly, the traction assembly at least including a traction roller for pulling the pole piece; a pressure roller assembly, the pressure roller assembly is arranged downstream of the traction assembly for rolling the pole piece; and a stretching assembly, the stretching assembly is arranged between the traction assembly and the pressure roller assembly, the stretching assembly includes a bracket and a stretching roller and a heating element movably arranged on the bracket, the stretching roller can move toward or away from the pole piece along the height direction of the bracket, the heating element is used to heat the pole piece ear, and the stretching roller is used to roll and flatten the pole ear.

[0007] Furthermore, the heating element is arranged on a side of the stretching roller away from the traction assembly.

[0008] Furthermore, the heating element is spaced apart from the tab; and / or the heating element is one of an infrared heating element, an ultrasonic heating element and an electric radiation heating element.

[0009] Furthermore, the stretching assembly also includes a longitudinal adjustment structure, which includes a mounting plate, which is arranged on the bracket; a first driving member, which is arranged on the mounting plate and is connected to the stretching roller drive, and the first driving member provides driving force for the stretching roller toward or away from the pole ear.

[0010] Furthermore, the first driving member is drivingly connected to the heating member, and the first driving member provides driving force for the heating member to move toward or away from the tab; or the heating member is arranged on the mounting plate.

[0011] Furthermore, the stretching assembly also includes a transverse adjustment structure arranged on the bracket, and the mounting plate of the longitudinal adjustment structure is arranged on the transverse adjustment structure, and the transverse adjustment structure provides driving force for the longitudinal adjustment structure to move axially along the traction roller.

[0012] Furthermore, the lateral adjustment structure includes a second driving member, which is arranged on the bracket; a screw, which extends along the axial direction of the traction roller and is rotatably mounted on the bracket, and the second driving member is drivingly connected to one end of the screw; a slider, a slider sleeve is arranged on the screw and rotatably cooperates with the screw, and the mounting plate is arranged on the slider.

[0013] Furthermore, along the axial direction of the pulling roller, the stretching assemblies are arranged in pairs to correspond to the pole ears on both sides of the pole piece respectively.

[0014] Furthermore, the stretching roller is a conical structure extending along the axial direction of the traction roller.

[0015] Furthermore, the axis of the stretching roller is parallel to the axis of the traction roller; and / or the area of ​​the end surface of the stretching roller on one side close to the edge of the pole piece is larger than the area of ​​the end surface of the stretching roller on the other side.

[0016] Furthermore, the cone angle of the stretching roller is A, and A satisfies 1°≤A≤10°.

[0017] Furthermore, A is 3°.

[0018] Furthermore, the pole piece rolling device also includes a controller; a camera for taking pictures of the pole tab, and cameras are provided on the side of the traction assembly away from the pressure roller assembly and the side of the pressure roller assembly away from the traction assembly. The camera, traction assembly, pressure roller assembly and stretching assembly are all electrically connected to the controller.

[0019] Furthermore, the pressing roller assembly includes an upper pressing roller and a lower pressing roller, which are arranged on both sides of the pole piece along the thickness direction of the pole piece, and the axial extension length of the upper pressing roller and the lower pressing roller is greater than the length of the pole piece.

[0020] Furthermore, the pole piece rolling device further comprises a tension roller, which is arranged between the traction roller and the stretching assembly, or between the stretching assembly and the pressing roller assembly.

[0021] Applying the technical solution of the present application, the pole piece rolling device adopts a stretching assembly arranged between the traction assembly and the pressing roller assembly, and the stretching assembly is used to stretch the pole tabs on the pole piece, thereby flattening the wrinkles formed in the pole tab area. Specifically, the stretching assembly includes a stretching roller and a heating element, wherein the heating element heats the pole tab to improve the toughness and ductility of the pole tab, avoids the problem of the pole tab cracking, and also facilitates the stretching and flattening operations of the pole tab; at the same time, the stretching roller can move toward or away from one side of the pole tab to adjust the contact degree between the pole tab and the stretching roller, thereby facilitating the stretching amplitude requirements of different pole tabs, facilitating the regulation of the stretching amplitude, and improving the operability and applicability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings that constitute part of this application are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation on this application. In the drawings:

[0023] Figure 1 A schematic diagram of the three-dimensional structure of the pole piece rolling device of the present application is shown;

[0024] Figure 2 A schematic diagram of the three-dimensional structure of the stretching assembly of the present application is shown, wherein the stretching assemblies are arranged in pairs;

[0025] Figure 3 A schematic diagram of the three-dimensional structure of the stretching assembly of the present application is shown;

[0026] Figure 4 A schematic diagram of the three-dimensional structure of the lateral adjustment structure of the present application is shown;

[0027] Figure 5 A schematic diagram of the three-dimensional structure of the stretching roller of the present application is shown;

[0028] Figure 6 A schematic diagram of the matching structure of the stretching roller and the tab of the present application is shown.

[0029] The above drawings include the following reference numerals:

[0030] 10. Pole piece; 110. Pole ear; 20. Pulling roller; 30. Pressure roller assembly; 310. Upper pressure roller; 320. Lower pressure roller; 40. Tension roller; 50. Stretching assembly; 510. Bracket; 520. Heating element; 530. Stretching roller; 540. Transverse adjustment structure; 541. Second drive element; 542. Lead screw; 543. Slider; 550. Longitudinal adjustment structure; 551. Mounting plate; 552. First drive element; 60. Camera. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0032] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0033] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to actual proportional relationships. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values ​​should be interpreted as being merely exemplary, not as limitations. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0034] In order to solve the problem in the prior art of tab production that the tab stretching amplitude is difficult to control, which affects production efficiency, the present application provides a pole piece rolling device. The pole piece rolling device provided in this embodiment is used for pole piece manufacturing.

[0035] The pole piece rolling device includes a shell, which has a protective function. Rolling the pole piece inside the shell is beneficial to improving the stability of pole piece manufacturing. At the same time, the setting of the shell also has a heat preservation effect.

[0036] like Figures 1 to 6As shown, the pole piece rolling device includes a traction assembly, a pressure roller assembly 30 and a stretching assembly 50. The traction assembly includes at least a traction roller 20 for pulling the pole piece 10. The pressure roller assembly 30 is arranged downstream of the traction assembly for rolling the pole piece 10. The stretching assembly 50 is arranged between the traction assembly and the pressure roller assembly 30. The stretching assembly 50 includes a bracket 510 and a stretching roller 530 and a heating element 520 movably arranged on the bracket 510. The stretching roller 530 can move toward or away from the pole piece 10 along the height direction of the bracket 510. The heating element 520 is used to heat the pole ear 110 of the pole piece 10. The stretching roller 530 is used to roll and flatten the pole ear 110.

[0037] The traction assembly further includes a traction drive member, which is drive-connected to the traction roller 20 , and provides driving force for the traction roller 20 to rotate.

[0038] Specifically, the traction drive member is a rotary motor or a rotary cylinder.

[0039] In this embodiment, the structure for the traction drive member to drive the traction roller 20 to rotate can be that the traction drive member is driven and connected to one end of the traction roller 20 to drive the traction roller 20 to rotate; or the traction roller 20 can be rotatably arranged on the shell, and the traction drive member is driven and connected to the traction roller 20 through a transmission member, wherein the transmission member can be a gear or a conveyor belt.

[0040] The traction roller 20 is used to provide traction for the movement of the pole piece 10 , thereby enabling the pole piece 10 to move toward one side of the pressure roller assembly 30 .

[0041] It can be understood that the downstream in this application refers to the downstream along the direction of movement of the pole piece 10, that is, the pole piece 10 first passes through the traction assembly and then passes through the pressure roller assembly 30, that is, the pressure roller assembly 30 is arranged downstream of the traction assembly.

[0042] In this embodiment, the bracket 510 is fixedly disposed on the housing, and the bracket 510 provides installation for the heating element 520 and the stretching roller 530 .

[0043] In this embodiment, the pole piece rolling device adopts a stretching assembly 50 set between the traction assembly and the pressure roller assembly 30, and the pole tab 110 on the pole piece 10 is stretched by the stretching assembly 50, thereby achieving the flattening of the wrinkles formed in the pole tab 110 area. Specifically, the stretching assembly 50 includes a stretching roller 530 and a heating element 520, wherein the heating element 520 heats the pole tab 110 to improve the toughness and ductility of the pole tab 110, avoid the problem of cracking of the pole tab 110, and facilitate the stretching and flattening operation of the pole tab 110; at the same time, the stretching roller 530 can move toward or away from one side of the pole tab 110 to adjust the contact degree between the pole tab 110 and the stretching roller 530, thereby facilitating the stretching amplitude requirements of different pole tabs 110, facilitating the regulation of the stretching amplitude, and improving the operability and applicability of the device.

[0044] like Figure 1 As shown, the pressing roller assembly 30 includes an upper pressing roller 310 and a lower pressing roller 320 , which are arranged on both sides of the pole piece 10 along the thickness direction of the pole piece 10 so as to press the pole piece 10 through the upper pressing roller 310 and the lower pressing roller 320 .

[0045] The axial extension length of the upper pressing roller 310 and the lower pressing roller 320 is greater than the length of the electrode sheet 10 , so that the upper pressing roller 310 and the lower pressing roller 320 can fully cover the electrode sheet 10 , thereby achieving full rolling of the electrode sheet 10 .

[0046] In this embodiment, the diameter of the lower pressing roller 320 is larger than that of the upper pressing roller 310. The larger diameter of the lower pressing roller 320 can provide better support, and the smaller diameter of the upper pressing roller 310 is convenient for the driving member to drive.

[0047] In this embodiment, the pressure roller assembly 30 further includes an upper roller driver and a lower roller driver, which are disposed on the housing and are drivingly connected to the upper pressure roller 310. The upper roller driver provides a driving force for the rotation of the upper pressure roller 310, while the lower roller driver provides a driving force for the rotation of the lower pressure roller 320. The upper roller driver and the lower roller driver are rotary motors or rotary cylinders.

[0048] like Figure 1 As shown, the axes of the pulling roller 20, the upper pressing roller 310, the lower pressing roller 320 and the stretching roller 530 in the present application are arranged in parallel.

[0049] In this embodiment, the heating element 520 is disposed on the side of the stretching roller 530 away from the traction assembly, so that the tab 110 is first heated by the heating element 520 and then rolled by the stretching roller 530 to facilitate rolling and flattening the tab 110.

[0050] The heating element 520 is preferably spaced apart from the tab 110 to prevent the heating element 520 from damaging the tab 110. The heating element 520 is one of an infrared heating element, an ultrasonic heating element, and an electric radiation heating element.

[0051] Of course, the heating element 520 is not limited to the above-mentioned structural elements, and may also be other structural elements with heating functions.

[0052] like Figure 2 and Figure 3 As shown, the stretching assembly 50 also includes a longitudinal adjustment structure 550, which includes a mounting plate 551 and a first driving member 552. The mounting plate 551 is arranged on the bracket 510, and the first driving member 552 is arranged on the mounting plate 551. The first driving member 552 is driven and connected to the stretching roller 530, and the first driving member 552 provides driving force for the stretching roller 530 toward or away from the pole ear 110.

[0053] The longitudinal adjustment structure 550 is used to enable the stretching roller 530 to move along the height direction of the bracket 510 to adjust the distance between the stretching roller 530 and the tab 110 and the contact degree between the stretching roller 530 and the tab 110 .

[0054] Specifically, the first driving member 552 is a telescopic motor or a telescopic cylinder. The driving shaft of the first driving member 552 cooperates with the stretching roller 530 to drive the stretching roller 530 toward or away from the tab 110 .

[0055] In this embodiment, the mounting plate 551 does not move in the height direction along the bracket 510, and the first driving member 552 is set on the mounting plate 551, so that the stretching roller 530 can be driven to move in position during the extension and retraction of the driving shaft of the first driving member 552.

[0056] In this embodiment, the heating element 520 can move synchronously along the height direction of the bracket 510 following the stretching roller 530, or the heating element 520 can not move along the height direction of the bracket 510. This embodiment provides the following two implementation methods.

[0057] like Figures 1 to 3 In the embodiment shown, the heating element 520 is disposed on a mounting plate 551 .

[0058] Specifically, the heating element 520 is arranged on the mounting plate 551 to achieve a fixed connection, and then the first driving element 552 only drives the telescopic roller to move along the height direction of the bracket 510. At this time, the heating element 520 has a fixed position, which can avoid the heating element 520 from contacting the pole ear 110 and causing damage to the pole ear 110. The overall structure is simple and easy to operate.

[0059] In a specific embodiment not shown in the figure, the first driving member 552 is drivingly connected to the heating member 520 , and the first driving member 552 provides a driving force for the heating member 520 to move toward or away from the tab 110 .

[0060] Specifically, the first driving member 552 simultaneously drives the heating member 520 and the stretching roller 530 to move toward or away from the tab 110 along the height direction of the bracket 510 to adapt to the tab 110 with different stretching and flattening requirements. The movable setting of the heating member 520 facilitates reducing the distance between the tab 110 and the heating member, thereby improving the toughness and ductility of the tab 110.

[0061] like Figure 2 and Figure 3 As shown, the stretching assembly 50 also includes a transverse adjustment structure 540 arranged on the bracket 510, and the mounting plate 551 of the longitudinal adjustment structure 550 is arranged on the transverse adjustment structure 540, and the transverse adjustment structure 540 provides driving force for the longitudinal adjustment structure 550 to move axially along the traction roller 20.

[0062] Specifically, the lateral adjustment structure 540 is used to drive the longitudinal adjustment structure 550, the heating element 520 and the stretching roller 530 to move along the axial direction of the pulling roller 20, that is, the width direction of the pole piece 10. Figure 1 In the X direction shown, the height direction of the bracket 510 is Figure 1 The Z direction is shown.

[0063] Among them, the setting of the lateral adjustment structure 540 is conducive to being applicable to pole pieces 10 of different widths, thereby providing an adjustment function of the lateral adjustment structure 540, moving the heating element 520 and the stretching roller 530 to a position relative to the pole ear 110, so as to improve the applicability of the overall device.

[0064] In this embodiment, the lateral adjustment structure 540 includes a second driving member 541, a screw 542 and a slider 543. The second driving member 541 is arranged on the bracket 510, the screw 542 extends along the axial direction of the traction roller 20, and the screw 542 is rotatably mounted on the bracket 510. The second driving member 541 is drivingly connected to one end of the screw 542. The slider 543 is sleeved on the screw 542 and rotatably cooperates with the screw 542. The mounting plate 551 is arranged on the slider 543.

[0065] The second driving member 541 is a rotary motor or a rotary cylinder. The slider 543 has an internal thread that cooperates with the lead screw 542, thereby realizing the rotation connection between the slider 543 and the lead screw 542.

[0066] When it is necessary to adjust the position of the heating element 520 and the stretching roller 530 to the width of the pole piece 10, the second driving member 541 drives the screw 542 to rotate, and the rotation of the screw 542 drives the slider 543 to move along the extension direction of the screw 542, and the slider 543 drives the mounting plate 551 to move, thereby realizing the movement of the heating element 520 and the stretching roller 530 along the width direction of the pole piece 10.

[0067] In this embodiment, along the axial direction of the pulling roller 20, the stretching assemblies 50 are provided in pairs to correspond to the pole tabs 110 on both sides of the pole piece 10. Since the pole tabs 110 are located on both sides of the width of the pole piece 10, the two stretching assemblies 50 are provided to complete the roller flattening of the pole tabs 110.

[0068] The brackets 510 of the two stretching components 50 may be connected or separately arranged.

[0069] like Figure 3 and Figure 4 As shown, the stretching roller 530 is a conical structure extending along the axial direction of the pulling roller 20.

[0070] Specifically, the stretching roller 530 is a truncated cone structure, and the area of ​​the end surface of the stretching roller 530 on one side close to the edge of the pole piece 10 is larger than the area of ​​the end surface of the stretching roller 530 on the other side.

[0071] Since the actual tab 110 has a certain amount of stretching and rebound, a taper is set to compensate for the rebound after the tab 110 is stretched. The tab 110 is rolled by the outer side of the stretching roller 530, thereby bending the tab 110 toward the bottom side of the bracket 510. When the stretching roller 530 is separated from the tab 110, the tab 110 can be restored to a position roughly parallel to the pulling roller 20 due to the elastic restoring force.

[0072] In this embodiment, the cone angle of the stretching roller 530 is A, and A satisfies 1°≤A≤10°. Specifically, A can be 1°, 2°, 3°, 4°, 5°, 6°, 7°, 8°, 9°, or 10°. The cone angle of the stretching roller 530 can be designed according to the thickness of the pole piece 10 and the requirements.

[0073] In this embodiment, preferably A is 3°.

[0074] like Figure 1 As shown, the pole piece rolling device further includes a controller and a camera 60 . The camera 60 is used to take pictures of the pole tab 110 . Both the controller and the camera 60 are arranged on the housing.

[0075] Specifically, a camera 60 is provided on the side of the traction assembly away from the pressure roller assembly 30 and the side of the pressure roller assembly 30 away from the traction assembly. The camera 60, the traction assembly, the pressure roller assembly 30 and the stretching assembly 50 are all electrically connected to the controller.

[0076] The controller controls the machine, traction assembly, pressure roller assembly 30 and stretching assembly 50 to realize automation of the entire process, reduce manual participation, thereby reducing labor costs and avoiding errors that may occur due to manual participation.

[0077] The camera 60 arranged on the side of the traction assembly away from the pressure roller assembly 30 is a front camera, which is used to record the size of the fold area and the pole piece 10 and transmit them to the controller. The controller controls the stretching assembly 50 to adjust the position of the stretching roller 530 and the heating element 520.

[0078] The camera 60 provided on the side of the roller assembly 30 away from the traction assembly is a rear camera, which is used to record the flattened tab 110 to observe the wrinkles and bending states of the tab 110 and record data.

[0079] In this embodiment, the pole piece rolling device also includes a tension roller 40, which is arranged on the shell and located between the traction roller 20 and the pressure roller assembly 30. The tension roller 40 is used to provide tension to the pole piece 10 so that the pole piece 10 is in a taut state to avoid the phenomenon of overlapping of the pole pieces 10.

[0080] Specifically, the tension roller 40 is disposed between the pulling roller 20 and the stretching assembly 50 .

[0081] In this embodiment, the tension roller 40 may also be disposed between the stretching assembly 50 and the pressure roller assembly 30 , and the location of the tension roller 40 may be adaptively disposed according to the space of the housing.

[0082] From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects:

[0083] The pole piece rolling device of the present application adopts a stretching assembly 50 provided between the traction assembly and the pressing roller assembly 30, and the pole tab 110 on the pole piece 10 is stretched by the stretching assembly 50, thereby flattening the wrinkles formed in the area of ​​the pole tab 110. Specifically, the stretching assembly 50 includes a stretching roller 530 and a heating element 520, wherein the heating element 520 heats the pole tab 110 to improve the toughness and ductility of the pole tab 110, avoid the problem of cracking of the pole tab 110, and also facilitate the stretching and flattening operations of the pole tab 110.

[0084] The stretching roller 530 of the present application can move toward or away from one side of the tab 110 to adjust the degree of contact between the tab 110 and the stretching roller 530, thereby facilitating the stretching amplitude requirements of different tabs 110, facilitating the regulation of the stretching amplitude, and improving the operability and applicability of the device.

[0085] In the description of this application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of this application; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0086] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0087] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0088] The foregoing description is merely a preferred embodiment of the present application and is not intended to limit the present application. Persons skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A pole piece rolling device, characterized in that: include: A traction assembly, the traction assembly comprising at least a traction roller (20) for traction of the pole piece (10); a pressing roller assembly (30), the pressing roller assembly (30) being arranged downstream of the traction assembly and used for rolling the pole piece (10); A stretching assembly (50) is provided between the traction assembly and the pressure roller assembly (30), the stretching assembly (50) comprising a bracket (510) and a stretching roller (530) and a heating element (520) movably provided on the bracket (510), the stretching roller (530) being capable of moving toward or away from the pole piece (10) along the height direction of the bracket (510), the heating element (520) being used for heating the pole lug (110) of the pole piece (10), and the stretching roller (530) being used for rolling and flattening the pole lug (110).

2. The pole piece rolling device according to claim 1, characterized in that: The heating element (520) is arranged on a side of the stretching roller (530) away from the traction assembly.

3. The pole piece rolling device according to claim 1, characterized in that: The heating element (520) and the tab (110) are spaced apart; and / or The heating element (520) is one of an infrared heating element, an ultrasonic heating element and an electric radiation heating element.

4. The pole piece rolling device according to claim 1, characterized in that: The stretching assembly (50) further includes a longitudinal adjustment structure (550), wherein the longitudinal adjustment structure (550) includes: a mounting plate (551), the mounting plate (551) being disposed on the bracket (510); A first driving member (552) is provided on the mounting plate (551), the first driving member (552) is drivingly connected to the stretching roller (530), and the first driving member (552) provides a driving force for the stretching roller (530) to move toward or away from the tab (110).

5. The pole piece rolling device according to claim 4, characterized in that: The first driving member (552) is drivingly connected to the heating member (520), and the first driving member (552) provides a driving force for the heating member (520) to move toward or away from the tab (110); or The heating element (520) is arranged on the mounting plate (551).

6. The pole piece rolling device according to claim 4, characterized in that: The stretching assembly (50) further comprises a transverse adjustment structure (540) arranged on the bracket (510), a mounting plate (551) of the longitudinal adjustment structure (550) being arranged on the transverse adjustment structure (540), and the transverse adjustment structure (540) providing a driving force for the longitudinal adjustment structure (550) to move along the axial direction of the traction roller (20).

7. The pole piece rolling device according to claim 6, characterized in that: The lateral adjustment structure (540) includes: a second driving member (541), the second driving member (541) being disposed on the bracket (510); a lead screw (542), the lead screw (542) extending along the axial direction of the traction roller (20), the lead screw (542) being rotatably mounted on the bracket (510), and the second driving member (541) being drivingly connected to one end of the lead screw (542); A slider (543) is sleeved on the lead screw (542) and rotatably engaged with the lead screw (542), and the mounting plate (551) is disposed on the slider (543).

8. The pole piece rolling device according to claim 1, characterized in that: Along the axial direction of the pulling roller (20), the stretching components (50) are arranged in pairs to correspond to the pole ears (110) on both sides of the pole piece (10), respectively.

9. The pole piece rolling device according to any one of claims 1 to 8, characterized in that: The stretching roller (530) is a conical structure extending along the axial direction of the traction roller (20).

10. The pole piece rolling device according to claim 9, characterized in that: The axis of the stretching roller (530) is parallel to the axis of the pulling roller (20); and / or The area of ​​the end surface of the stretching roller (530) on one side close to the edge of the pole piece (10) is larger than the area of ​​the end surface on the other side of the stretching roller (530).

11. The pole piece rolling device according to claim 9, characterized in that: The cone angle of the stretching roller (530) is A, and A satisfies 1°≤A≤10°.

12. The pole piece rolling device according to claim 11, characterized in that: The A is 3°.

13. The pole piece rolling device according to any one of claims 1 to 8, characterized in that: The pole piece rolling device further comprises: Controller; A camera (60) for photographing the tab (110) is provided on a side of the traction assembly away from the pressure roller assembly (30) and a side of the pressure roller assembly (30) away from the traction assembly. The camera (60), the traction assembly, the pressure roller assembly (30) and the stretching assembly (50) are all electrically connected to the controller.

14. The pole piece rolling device according to any one of claims 1 to 8, characterized in that: The pressure roller assembly (30) comprises an upper pressure roller (310) and a lower pressure roller (320), wherein the upper pressure roller (310) and the lower pressure roller (320) are arranged on both sides of the pole piece (10) along the thickness direction of the pole piece (10), and the axial extension length of the upper pressure roller (310) and the lower pressure roller (320) is greater than the length of the pole piece (10).

15. The pole piece rolling device according to any one of claims 1 to 8, characterized in that: The pole piece rolling device further comprises a tension roller (40), wherein the tension roller (40) is arranged between the traction roller (20) and the stretching assembly (50), or the tension roller (40) is arranged between the stretching assembly (50) and the pressing roller assembly (30).

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