Feeding lug folding device

Abstract

The present invention discloses a feeding and folding device for pole lugs, comprising a first mounting seat and a second mounting seat arranged opposite to each other. The first mounting seat is rotatably provided with at least one first pre-stressing portion, and the first pre-stressing portion is fixedly connected to a first pressure roller. The second mounting seat comprises a main body portion and a pressure roller mounting plate connected to each other, and the main body portion is rotatably provided with at least one second pre-stressing portion opposite to the first pre-stressing portion, and the pressure roller mounting plate is elastically provided with a second pressure roller corresponding to the first pressure roller. A pole piece with a pole lug passes between the first pressure roller and the second pressure roller, and the first pre-stressing portion and the second pre-stressing portion bend the pole lug toward one side of the pole piece. The feeding and folding device for pole lugs of the present invention can adjust the positions of the second pressure roller and the second pre-stressing portion independently of each other, thereby improving the effect of folding the pole lugs.

Description

Technical Field

[0001] The invention belongs to the field of lithium battery automation equipment, and in particular relates to a feeding and tab folding device. Background Art

[0002] In lithium battery production, the positive electrode sheet, negative electrode sheet, and separator are wound sequentially to form a battery cell. The tabs are the metal conductors that connect the positive and negative electrodes of the battery cell. After the cell is wound, the tabs need to be uniformly bent toward the center of the cell's cross-section. This process is called tab shaping. The tabs are then gathered inward, making it easier to install the battery cell into the casing.

[0003] The industry typically uses a pre-pressing roller to shape the tab. The roller consists of a cylindrical roller body and a tapered pressing portion at one end. The roller body is used to clamp the pole piece, while the pressing portion is used to shape the tab. In practice, it's difficult for the pre-pressing roller to ensure proper contact between the pole piece and the tab. Consequently, the roller body often fits the pole piece while the pressing portion doesn't. This means the tab bent by the roller doesn't achieve the desired pre-bending effect, making it difficult to bend the tab during subsequent tab shaping. Summary of the Invention

[0004] In order to solve the problems existing in the above background technology, the present invention provides a feeding tab folding device.

[0005] The feeding and folding pole ear device provided by the present invention includes a first mounting seat and a second mounting seat arranged relatively to each other, the first mounting seat is rotatably provided with at least one first pre-stressing part, the first pre-stressing part is fixedly connected to a first pressure roller, the second mounting seat is rotatably provided with at least one second pre-stressing part opposite to the first pre-stressing part, and is characterized in that the second mounting seat includes a main body and a pressure roller mounting plate arranged on the main body, the second pre-stressing part is arranged on the main body, the pressure roller mounting plate is elastically provided with a second pressure roller corresponding to the first pressure roller, a pole piece with a pole ear passes between the first pressure roller and the second pressure roller, and the first pre-stressing part and the second pre-stressing part bend the pole ear toward one side of the pole piece.

[0006] In one embodiment of the feeding and tab folding device of the present invention, both ends of the second pressing roller are respectively arranged in the pressing roller mounting plate, and a force toward the first pressing roller is applied to the second pressing roller through an elastic member.

[0007] In one embodiment of the feeding and folding lug device of the present invention, the elastic member is a ball plunger, which is arranged on a limit plate, and its elastic end abuts against one end of the second pressure roller; the limit plate confines the two ends of the second pressure roller within the pressure roller mounting plate.

[0008] In one embodiment of the feeding and tab folding device of the present invention, the feeding and tab folding device further comprises a driving member, which is drivingly connected to the second mounting seat to drive the second mounting seat to approach or move away from the first mounting seat.

[0009] In one embodiment of the feeding and folding tab device of the present invention, at least two first pre-stressing parts and second pre-stressing parts are provided along the traveling direction of the pole piece, and have conical surfaces that match each other, and the taper of the conical surfaces of the first pre-stressing parts and the second pre-stressing parts gradually increases along the traveling direction of the pole piece.

[0010] In one embodiment of the feeding and folding tab device of the present invention, the first pre-pressing portion includes a first conical portion, and the second pre-pressing portion includes a second conical portion. The first conical portion and the second conical portion cooperate to bend the free end of the tab.

[0011] In one embodiment of the feeding and folding tab device of the present invention, the first pre-pressing portion further includes a first cylindrical portion connected to the first conical portion, and the second pre-pressing portion further includes a second cylindrical portion connected to the second conical portion, and the first cylindrical portion and the second cylindrical portion cooperate to press the root of the tab.

[0012] In one embodiment of the feeding and folding tab device of the present invention, the at least one first pre-pressing portion is a first indentation portion, and the at least one second pre-pressing portion is provided with a second indentation portion cooperating with the first indentation portion, and the second indentation portion is in line contact with the first indentation portion.

[0013] In one embodiment of the feeding and tab folding device of the present invention, the first indentation portion is a rubber-coated roller, and the second indentation portion is a steel roller.

[0014] In one embodiment of the feeding and folding tab device of the present invention, the first indentation is cylindrical, the second indentation has a protruding blade, and the second indentation cooperates with the first indentation to form a fold at the root of the tab.

[0015] To sum up, the feeding and folding lug device of the present invention sets the second pressing roller and the first pre-stressing part separately, the second pressing roller is elastically set on the pressing roller mounting plate, and the second pre-stressing part is driven by the driving member to adjust the distance between it and the first pre-stressing part. The positions of the second pressing roller and the second pre-stressing part can be adjusted independently of each other, and the folding lug effect is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural diagram of a first embodiment of a feeding and tab folding device according to the present invention;

[0017] Figure 2 yes Figure 1 Right side view with the pressure roller mounting plate removed;

[0018] Figure 3This is a structural diagram of a second embodiment of the feeding and tab folding device of the present invention;

[0019] Figure 4 yes Figure 3 Right side view with the pressure roller mounting plate removed;

[0020] Figure 5 This is a structural diagram of the third embodiment of the feeding tab folding device of the present invention with some components removed;

[0021] Figure 6 yes Figure 5 Structural diagram from another angle. DETAILED DESCRIPTION

[0022] The present invention will be further described below with reference to the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it. However, the embodiments are not intended to limit the present invention.

[0023] Example 1:

[0024] like Figure 1 、 Figure 2 As shown, the feeding and folding tab device of this embodiment includes a first mounting seat 100 and a second mounting seat 200 that can be driven to move closer to and away from the first mounting seat 100. The first mounting seat 100 and the second mounting seat 200 each have a plate-shaped main body. Three first pre-pressing parts 110 are rotatably connected to the first mounting seat 100, and three second pre-pressing parts 210 are rotatably connected to the second mounting seat 200. The free ends of the three first pre-pressing parts 110 are all fixedly connected to the first pressing roller 120 via threads. A pressing roller mounting plate 300 is fixedly connected or integrally formed on one side of the main body of the second mounting seat 200. The pressing roller mounting plate 300 is provided with multiple second pressing rollers 220 corresponding to the second pre-pressing parts 210. The second pressing rollers 220 can rotate around their own axes, and the three second pressing rollers 220 are respectively located substantially in the same straight line as one second pressing roller 220. A driving member 400 is fixedly provided at both ends of the first mounting seat 100, and the driving member 400 is preferably a cylinder. The driving end of the cylinder is connected to the second mounting seat 200. The cylinder drives the second mounting seat 200 to drive the three second pre-stressing parts 210 and the second pressing roller 220 to approach the three first pre-stressing parts 110 and the first pressing roller 120 to press the pole piece passing through the first pressing roller 120 and the second pressing roller 220 and the pole ear passing through the end of the pole piece between the first pre-stressing part 110 and the second pre-stressing part 210.

[0025] The first pre-pressing portion 110 and the second pre-pressing portion 210 are respectively provided with a tapered surface. The cross-sectional diameters of the two ends of the tapered surface are different, forming a large diameter end and a small diameter end respectively. The two tapered surfaces cooperate with each other to bend the tab.

[0026] In this embodiment, the end of the first pre-pressing portion 110 connected to the first pressing roller 120 is a small diameter end, and the end of the second pre-pressing portion 210 close to the second pressing roller 220 is a large diameter end. The first pre-pressing portion 110 and the second pre-pressing portion 210 cooperate to press the tab along the extension direction of the conical surface, that is, toward Figure 2 In other embodiments, the end of the first pre-pressing portion 110 connected to the first pressing roller 120 may be the large-diameter end, and the end of the second pre-pressing portion 210 close to the second pressing roller 220 may be the small-diameter end. In this case, the first pre-pressing portion 110 and the second pre-pressing portion 210 cooperate to bend the tab downward.

[0027] One end of the feeding and folding tab device is the feeding end 500, and the other end is the discharging end 600. The pole piece is fed from the feeding end 500, and the movement of the pole piece drives the second pressing roller 220 and the first pressing roller 120 to rotate. The pole piece passes through the gap between the second pressing roller 220 and the first pressing roller 120 to smooth the pole piece, and the gap between the first pre-pressing part 110 and the second pre-pressing part 210 to bend the pole tab.

[0028] If the tab is bent too much at one time from the feed end 500 to the gap between the first pre-pressing part 110 and the second pre-pressing part 210, the free end of the tab may be folded toward the end connected to the electrode sheet, causing damage to the tab. In order to avoid the above problem, the taper of the conical surface of the three first pre-pressing parts 110 and the second pre-pressing part 210 gradually increases from the feed end 500 to the discharge end 600, thereby gradually increasing the bending angle of the tab. Figure 1 As shown, the taper of the second front pre-stressing portion 211 is smaller than that of the second middle pre-stressing portion 212, and the taper of the second middle pre-stressing portion 212 is smaller than that of the second rear pre-stressing portion 213. The taper of the second rear pre-stressing portion 213 represents the expected bending angle of the tab. The pole piece is fed from the feed end 500, and the tab passes sequentially between the first pre-stressing portion 110 and the second pre-stressing portion 210. The taper gradually increases, gradually increasing the bending angle of the tab and achieving a better bending effect. In this embodiment, there are three first pre-stressing portions 110 and second pre-stressing portions 210. In other embodiments, they can also be set to other numbers greater than 1. The smaller the gradient of the taper change of the first pre-stressing portion 110 and the second pre-stressing portion 210, the better the effect of bending the tab.

[0029] The driving member 400 drives the second mounting seat 200 to approach the first mounting seat at a very high speed, resulting in a large impact force between the second pre-stressing portion 210 and the first pre-stressing portion 110, which will crush the tab. In this embodiment, the first mounting seat 100 and the second mounting seat 200 are connected by a pair of hydraulic buffers 700, which guide and provide a certain buffering effect on the pressing of the second pre-stressing portion 210 and the first pre-stressing portion 110, thereby avoiding crushing the tab. In other embodiments, the connection between the second mounting seat 200 and the first mounting seat 100 can adopt a buffer slide rail, a damping slide rail, etc., or can adopt a method of connecting a guide rod and an elastic member, which also plays a buffering and guiding role. The specific buffering method will not be repeated.

[0030] The second pressing roller 220 is mounted on the pressing roller mounting plate 300 of the second mounting base 200. Specifically, the pressing roller mounting plate 300 is provided with multiple pairs of slots 310. The shafts at both ends of the second pressing roller 220 are retained within each pair of slots 310 and are restrained within the slots 310 by stop plates 320. The rollers of the second pressing roller 220 are rotatably mounted on the shafts via bearings and are separated from the second pre-pressing portion 210.

[0031] Elastic members 330 are provided at positions on the limiting plate 320 corresponding to the ends of the shaft of each second pressure roller 220. The elastic members 330 are preferably ball plungers fixed to the limiting plate 320, with the elastic ends abutting the shaft of the second pressure roller 220 to ensure that the second pressure roller 220 and the first pressure roller 120 evenly clamp the electrode sheet, preventing damage to the electrode sheet. The elastic members 330 can also be configured as tension springs, installed between the shaft of the second pressure roller 220 and the retaining slot 310, to apply a tensile force to the second pressure roller 220, similarly ensuring that the second pressure roller 220 and the first pressure roller 120 evenly clamp the electrode sheet. In some embodiments, the limiting plate 320 can be integrally configured with the pressure roller mounting plate 300, i.e., the ends of the second pressure roller 220 are disposed within the openings of the pressure roller mounting plate 300, and the elastic member is installed in the pressure roller mounting plate to push the second pressure roller 220 toward one side of the first pressure roller 120.

[0032] As can be seen from the above, the second pre-pressing portion 210 and the second pressing roller 220 are designed as independent separate structures, so that the relative positions of the two can be automatically adjusted within the elastic force range of the elastic member 330 . In this structure, when the driver 400 controls the second mounting seat 200 to move toward the first mounting seat 100 and causes the first pre-pressing portion 110 and the second pre-pressing portion 210 to press the tab, if the first and second pressing rollers 120 and 220 have not yet pressed the tab, the elastic member 330 can apply a thrust to the second pressing roller 220, causing it to deviate from the first pressing roller 120 and press the tab. If the first and second pressing rollers 120 and 220 have already pressed the tab but the first and second pre-pressing portions 110 and 210 have not yet pressed the tab, the driver 400 can continue to move the second mounting seat 200 closer to the first mounting seat 100 and ultimately cause the two pre-pressing portions 110 and 210 to press the tab. During this process, the elastic member 330 is compressed, preventing the pressure between the second pressing roller 220 and the first pressing roller 120 from damaging the tab. This improves the tab bending effect.

[0033] like Figure 2 As shown, the first pre-pressing portion 110 has a first cylindrical portion 111 and a first conical portion 112. The two ends of the first cylindrical portion 111 are respectively connected to the first conical portion 112 and the first pressing roller 120. The second pre-pressing portion 210 has a second cylindrical portion 214 and a second conical portion 215. One end of the second cylindrical portion 214 is connected to the second conical portion 215, and the other end is opposite to the second pressing roller 220. The lowest points of the two are basically located at the same horizontal plane, thereby ensuring that the second pressing roller 220 and the second cylindrical portion 214 contact the electrode sheet at substantially the same time. The first cylindrical portion 111 and the second cylindrical portion 214 cooperate to press the base of the electrode tab where it connects to the electrode sheet, while the first conical portion 112 and the second conical portion 215 cooperate to bend the electrode tab. If the first cylindrical portion 111 and the second cylindrical portion 214 are configured to press the edge of the pole piece, then when the pole piece inevitably deviates, the second conical portion 215 will bend the edge of the pole piece, thereby causing harmful deformation of the pole piece; while in this embodiment, the first cylindrical portion 111 and the second cylindrical portion 214 are configured to press the root of the pole ear, and a certain distance is reserved from the edge of the pole piece, which can prevent the edge of the pole piece from being damaged due to deviation to the first conical portion 112 and the second conical portion 215. In this way, in the subsequent pole ear shaping process, the outer pole ear can more easily wrap the inner pole ear, thereby improving the pole ear shaping effect.

[0034] In this embodiment, the feeding and folding lug device is further provided with a correction assembly (not shown), which includes a correction drive assembly connected to the first mounting seat 100 or the second mounting seat 200 and a correction sensor provided at the feeding end 500. The correction drive assembly corrects the deviation of the electrode piece in a timely manner according to the deviation of the electrode piece detected by the correction sensor. Feeding devices with correction functions are relatively common in the prior art. The installation method of the correction assembly in this embodiment is not specifically limited, and the specific correction method is not further described.

[0035] In this embodiment, the working process of the feeding tab folding device is as follows:

[0036] The pole piece is passed between the second pressing roller 220 and the first pressing roller 120. The driving member 400 drives the second mounting seat 200 close to the first mounting seat 100. After reaching the set position, the second pressing roller 220 and the first pressing roller 120 press the pole piece together, and the first pre-pressing part 110 and the second pre-pressing part 210 press the pole ear together. The pole piece is driven by a winding needle and the first pressing roller 120 and the second pressing roller 220 are driven to rotate by friction. The taper of the multiple first pre-pressing parts 110 and the second pre-pressing parts 210 gradually increases, and the pole ear is gradually bent while the pole piece is being conveyed. When the correction sensor detects that the pole piece is offset, the correction drive assembly drives the first mounting seat 100 or the second mounting seat 200 to offset as a whole to correct the pole piece.

[0037] Example 2:

[0038] like Figure 3 、 Figure 4 Figure 2 shows another embodiment of a feeding tab folding device. In this embodiment, to achieve better tab folding, one of the three first pre-pressing portions 110 is configured as a first indentation portion 130, and one of the three second pre-pressing portions 210 is configured as a second indentation portion 230. The first indentation portion 130 and the second indentation portion 230 cooperate with each other to create an indentation at the approximate base of the tab, facilitating subsequent tab shaping.

[0039] In this embodiment, the first indentation portion 130 and the second indentation portion 230 are respectively set as one and are arranged at the discharge end 600, and the root of the pole ear is pressed out with an indentation at the very end of the folding ear device; the first pre-pressing portion 110 and the second pre-pressing portion 210 are set as two, and the taper of the conical surface gradually increases from the feed end to the discharge end, and the pole ear is gradually bent.

[0040] In other embodiments, the first indentation portion 130 and the second indentation portion 230 can be set at any position from the feed end 500 to the discharge end 600 according to specific circumstances, and the number of settings can be set according to the material and thickness of the tab; in the case where the tab is thinner, the feed and folding tab device can also only include a set of first indentation portions 130 and second indentation portions 230 without setting the first pre-pressing portion 110 and the second pre-pressing portion 210, as long as the tab is pressed out of the indentation.

[0041] like Figure 4 As shown, the second indentation 230 has a second tapered portion 215 and a third tapered portion 216 connected to each other, wherein the third tapered portion 216 is close to the second pressing roller 220 and forms the free end of the second indentation 230. The tapered surface of the second tapered portion 215 gradually shrinks in the direction approaching the second mounting seat 200, and the tapered surface of the third tapered portion 216 gradually shrinks in the direction away from the second tapered portion 215, thereby forming a circle of protruding blades between the two tapered portions. The first indentation 130 is cylindrical. When the first indentation 130 and the second indentation 230 cooperate, the first indentation 130 keeps the entire tab substantially flat. The blade of the second indentation 230 is in line contact with the first indentation 130, thereby forming an indentation near the base of the tab.

[0042] In order to prevent the first indentation portion 130 and the second indentation portion 230 from hard contact and damaging the tab, the first indentation portion 130 is configured as a rubber-coated roller, and the second indentation portion 230 is configured as a steel roller.

[0043] In this embodiment, the third tapered portion 216 is provided. In other embodiments, the third tapered portion 216 may be omitted. The large diameter end of the second tapered portion 215 can also cooperate with the first indentation portion 130 to press an indentation into the tab.

[0044] Example 3:

[0045] In the above embodiment, the pole piece passes between the first pressing roller 120 and the second pressing roller 220, and the pole tab passes between the first pre-pressing part 110 and the second pre-pressing part 210. Since the contact area between the pole piece and the pressing roller is large, the pole piece is not easily damaged, and the first pressing roller 120 and the second pressing roller 220 can rotate under the drive of the pole piece; while the pole tab area is small and is easily damaged by static friction with the pre-pressing part. In order to avoid damaging the pole tab, as shown in FIG. Figure 5 、 Figure 6 As shown, in this embodiment, a power mechanism 800 is provided to drive the three first pre-pressing parts 110 and the three second pre-pressing parts 210 to rotate synchronously at the same speed as the pole pieces.

[0046] Specifically, the power mechanism 800 includes a servo motor 810, which is mounted on the first mounting seat 100 via a motor mounting plate 820. Its drive end extends beyond the motor mounting plate 820 to connect to a main drive pulley 830. The servo motor 810 and the main drive pulley 830 are located on either side of the first mounting seat 100, with the servo motor 810 positioned below the first pressure roller 120. The shaft of the first pre-pressing portion 110 is rotatably mounted within the first mounting seat 100 via bearings. The shaft extends beyond the first mounting seat 100 to connect to a first synchronous pulley 840. Similarly, the second pre-pressing portion 210 is mounted within the second mounting seat 200 and extends beyond the second mounting seat 200 to connect to a second synchronous pulley 850. Multiple transmission pulleys 860 are provided on the first and second mounting seats 100, ensuring that the transmission directions of the first and second synchronous pulleys 840 and 850 are consistent. The main drive wheel 830, the first synchronous pulley 840, the second synchronous pulley 850, and the transmission wheel 860 are connected through a double-sided toothed belt 870. The servo motor 810 drives the first pre-stressing part 110 and the second pre-stressing part 210 to rotate synchronously through the main drive wheel 830 and the double-sided toothed belt 870, and controls the rotation speed to be the same as the pole piece transmission speed to avoid the pole ear from being pulled and damaged.

[0047] To ensure more stable transmission between the second mounting seat 200 and the first mounting seat 100, in this embodiment, the first mounting seat 100 and the second mounting seat 200 are slidably connected via a pair of slide rails 900, which guide the sliding movement of the second mounting seat 200. Both the first mounting seat 100 and the second mounting seat 200 are configured as generally U-shaped plates with opposing U-shaped openings. The U-shaped plates of the second mounting seat 200 and the first mounting seat 100 are slidably connected via the slide rails 900. Three second synchronous pulleys 850 extend through the U-shaped opening of the first mounting seat 100, and three first pressure rollers 120 are rotatably connected to the first mounting seat 100 and extend through the U-shaped opening of the second mounting seat 200. The first synchronous pulley 840, the second synchronous pulley 850, and the first pre-pressing portion 110 and the second pre-pressing portion 210 are located on either side of the first mounting seat 100 and the second mounting seat 200, respectively, resulting in a more rational spatial layout.

[0048] The two transmission wheels 860 on the second mounting seat 200 are both mounted on the second mounting seat 200 through a connecting member 240. A waist-shaped hole is provided on the connecting member 240. The installation position of the transmission wheel 860 on the second mounting seat 200 is adjusted through the waist-shaped hole, thereby adjusting the tightness of the double-sided toothed belt 870.

[0049] In this embodiment, the working process of the feeding tab folding device is as follows:

[0050] The pole piece is passed between the second pressing roller 220 and the first pressing roller 120. The driving member 400 drives the second mounting seat 200 to approach the first mounting seat 100. At the same time, the servo motor 810 drives the first pressing roller 120 and the second pre-pressing part 210 to move synchronously. When the second pressing roller 220 and the first pressing roller 120 press the pole piece together, the rotation speed of the first pre-pressing part 110 and the second pre-pressing part 210 is the same as the pole piece transmission speed. The pole tab is bent after passing through the three pre-pressing parts. When the correction sensor detects that the pole piece is offset, the correction drive assembly drives the first mounting seat 100 or the second mounting seat 200 to offset as a whole to correct the pole piece.

[0051] The above embodiments are merely preferred embodiments for the purpose of fully illustrating the present invention, and the scope of protection of the present invention is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present invention are all within the scope of protection of the present invention. The scope of protection of the present invention shall be subject to the claims.

Claims

1. A feeding tab folding device, comprising a first mounting seat and a second mounting seat arranged opposite to each other, wherein the first mounting seat is rotatably provided with at least one first pre-pressing portion, the first pre-pressing portion is fixedly connected to a first pressing roller, and the second mounting seat is rotatably provided with at least one second pre-pressing portion opposite to the first pre-pressing portion, characterized in that: The second mounting seat includes a main body and a pressure roller mounting plate connected to the main body, the second pre-pressing portion is arranged on the main body, the pressure roller mounting plate is elastically provided with a second pressure roller corresponding to the first pressure roller, a pole piece with a pole tab passes between the first pressure roller and the second pressure roller, and the first pre-pressing portion and the second pre-pressing portion bend the pole tab toward one side of the pole piece; The first pre-pressing portion includes a first tapered portion, and the second pre-pressing portion includes a second tapered portion, wherein the first tapered portion and the second tapered portion cooperate to bend the free end of the tab; The first pre-pressing portion further includes a first cylindrical portion connected to the first conical portion, and the second pre-pressing portion further includes a second cylindrical portion connected to the second conical portion, and the first cylindrical portion and the second cylindrical portion cooperate to press the root of the tab; The feeding and folding lug device separately sets the second pressing roller and the second pre-pressing part. The second pressing roller is elastically set on the pressing roller mounting plate. The second pre-pressing part is driven by a driving member to adjust the distance between it and the first pre-pressing part. The positions of the second pressing roller and the second pre-pressing part can be adjusted independently of each other.

2. The feeding tab folding device according to claim 1, characterized in that: Both ends of the second pressing roller are respectively arranged in the pressing roller mounting plate, and a force toward the first pressing roller is applied to the second pressing roller through an elastic member.

3. The feeding tab folding device according to claim 2, characterized in that: The elastic member is a ball plunger, which is arranged on a limit plate, and its elastic end abuts against one end of the second pressure roller; the limit plate limits the two ends of the second pressure roller within the pressure roller mounting plate.

4. The feeding tab folding device according to claim 1, characterized in that: The driving member is drivingly connected to the second mounting seat to drive the second mounting seat to approach or move away from the first mounting seat.

5. The feeding tab folding device according to claim 1, characterized in that: At least two first pre-pressing parts and second pre-pressing parts are provided along the travel direction of the pole piece and have mutually matching conical surfaces, and the taper of the conical surfaces of the first pre-pressing parts and the second pre-pressing parts gradually increases along the travel direction of the pole piece.

6. The feeding tab folding device according to claim 1, characterized in that: The at least one first pre-pressing portion is a first indentation portion, and the at least one second pre-pressing portion is provided with a second indentation portion matched with the first indentation portion, and the second indentation portion is in line contact with the first indentation portion.

7. The feeding tab folding device according to claim 6, characterized in that: The first indentation portion is a rubber-coated roller, and the second indentation portion is a steel roller.

8. The feeding tab folding device according to claim 6, characterized in that: The first indentation is cylindrical, the second indentation has a protruding blade, and the second indentation cooperates with the first indentation to form a fold at the root of the tab.

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