Extension mechanism for battery pole piece

Abstract

The utility model relates to an extension mechanism for a battery pole piece. The extension mechanism comprises a calendering mechanism and a stretching mechanism, wherein the calendering mechanism and the stretching mechanism are connected to a large mechanism plate and extend the battery pole piece in sequence in the moving direction of the battery pole piece; wherein the calendaring mechanism comprises a calendaring roller and a calendaring wheel, the calendaring roller and the calendaring wheel move in the direction close to each other or away from each other, and the calendaring roller and the calendaring wheel grind each other to extend the battery pole piece; the stretching mechanism comprises a low-speed roller set and a high-speed roller set, and the low-speed roller set and the high-speed roller set drive the battery pole piece to move and form a speed difference so as to draw the battery pole piece. The rolling mechanism is used for extending the battery pole piece in the transverse direction and the longitudinal direction, and the longitudinal extension rate of the battery pole piece is the maximum after the battery pole piece is rolled, so that the longitudinal extension of the battery pole piece is increased through the stretching mechanism, and the problem that a tab area is wrinkled after the pole piece is rolled and extended is solved; the calendering mechanism and the stretching mechanism act together, so that an ideal tab extension effect is achieved, the belt breakage rate of a battery pole piece is reduced, and the production efficiency of equipment is improved.

Description

Technical Field

[0001] The present application relates to the technical field of battery production equipment, and in particular to an extension mechanism for battery pole pieces. Background Art

[0002] Pole sheet rolling is an important step in the production process of lithium-ion batteries, and its purpose is to obtain pole sheets that meet the design requirements. Rolling is a very necessary process. After the pole sheets are coated and dried, in order to increase the active material loading per unit volume of the powder layer, ensure the consistency of the pole sheet thickness, and enhance the bonding strength between the active material and the foil to prevent peeling during electrolyte immersion and battery use, the pole sheets need to be rolled.

[0003] In the prior art, as the density of the pole piece increases, the rolling device needs to provide a higher rolling pressure. Under the rolling pressure, the active material in the dressing area on the pole piece will produce an extrusion and embedding effect on the foil, causing the foil in the dressing area to extend longitudinally. However, there is a thickness difference between the tab area and the dressing area. If the tab area is not subjected to the rolling pressure during the rolling process, the tab area cannot extend longitudinally. The different longitudinal extensions of the dressing area and the tab area lead to differences in the longitudinal lengths of different areas, which ultimately leads to the tab area being prone to shrinkage and wrinkles near the dressing area, and even leads to broken foil. Summary of the invention

[0004] The embodiment of the present application provides an extension mechanism for a battery pole piece to solve the technical problem in the related art that the battery pole piece is prone to breakage during the rolling process.

[0005] The embodiment of the present application provides an extension mechanism for a battery electrode, comprising:

[0006] A rolling mechanism and a stretching mechanism connected to the mechanism plate and sequentially extending the battery pole pieces along the moving direction of the battery pole pieces;

[0007] The calendering mechanism includes a calendering roller and a calendering wheel moving in a direction of approaching or moving away from each other, and the calendering roller and the calendering wheel roll over each other to extend the battery electrode sheet;

[0008] The stretching mechanism comprises a slow roller group and a fast roller group, and the slow roller group and the fast roller group drive the battery pole piece to move and form a speed difference to stretch the battery pole piece.

[0009] In some embodiments: the calendering wheel is provided with a lifting structure for driving it to approach or move away from the calendering roller, the lifting structure includes a wedge block mechanism, a lifting cylinder located at the top of the wedge block mechanism, and a support rod rotatably connected to the calendering wheel is provided at the top of the lifting cylinder.

[0010] In some embodiments: the wedge block mechanism includes an upper wedge block and a lower wedge block that are slidably connected to each other, the upper wedge block is fixedly connected to the lifting cylinder, and the bottom of the lower wedge block is slidably connected to a support plate, and the support plate is provided with a push screw and a handle that drive the lower wedge block to slide.

[0011] In some embodiments: a lifting roller group is provided upstream and downstream of the calendering mechanism, and the lifting roller group includes a mounting plate, a rotating roller is slidably connected to the mounting plate, and an adjusting screw and a hand wheel for driving the rotating roller to lift and lower are also provided on the mounting plate.

[0012] In some embodiments: a supporting roller in close contact with the calendering roller is provided on the side of the calendering roller away from the calendering wheel, and the calendering roller and the supporting roller are rotatably connected to a large mechanism plate, and a servo motor is provided on the large mechanism plate for driving the calendering roller and the supporting roller to rotate respectively.

[0013] In some embodiments: the slow roller group and the fast roller group both include a differential roller rotatably connected to a large plate of the mechanism, and a support seat connected to the large plate of the mechanism, a differential wheel rotatably connected to the support seat, and a cylinder driving the differential wheel to move toward or away from the differential roller is connected to the support seat.

[0014] In some embodiments: a guide roller connected to a large plate of the mechanism is provided between the calendering mechanism and the stretching mechanism, and the guide roller presses down the battery electrode sheet so that the battery electrode sheet is attached to the stretching mechanism.

[0015] In some embodiments: a tensioning mechanism is also provided downstream of the stretching mechanism, and the tensioning mechanism includes a passing roller and a tension roller connected to a large plate of the mechanism, and a tension control mechanism for adjusting the tension of the battery electrode sheet is provided between the passing roller and the tension roller.

[0016] In some embodiments: the tension control mechanism includes a swing rod with one end rotatably connected to a large plate of the mechanism, the other end of the swing rod is rotatably connected to a swing roller, and the swing rod is also connected to a swing roller cylinder that drives the swing rod to swing up and down.

[0017] In some embodiments: a tension sensor is provided on the tension roller, and the tension sensor is connected to the swing roller cylinder through a controller, and the controller controls the extension and retraction amount of the swing roller cylinder according to the tension value detected by the tension sensor.

[0018] The beneficial effects of the technical solution provided by this application include:

[0019] An embodiment of the present application provides an extension mechanism for a battery electrode sheet, wherein the extension mechanism for a battery electrode sheet of the present application is provided with a rolling mechanism and a stretching mechanism which are connected to a large plate of the mechanism and sequentially stretch the battery electrode sheet along the moving direction of the battery electrode sheet; wherein the rolling mechanism includes a rolling roller and a rolling wheel which move in directions approaching or away from each other, and the rolling roller and the rolling wheel roll against each other to extend the battery electrode sheet; the stretching mechanism includes a slow roller group and a fast roller group, and the slow roller group and the fast roller group drive the battery electrode sheet to move and form a speed difference to stretch the battery electrode sheet.

[0020] Therefore, the stretching mechanism for the battery pole piece of the present application uses a calendering mechanism and a stretching mechanism to stretch the battery pole piece respectively. The calendering mechanism uses calendering rollers and calendering wheels to roll the battery pole piece against each other to stretch the battery pole piece, and the stretching mechanism uses a slow roller group and a fast roller group to drive the battery pole piece to move and form a speed difference to stretch the battery pole piece. The calendering mechanism stretches the battery pole piece in both the horizontal and longitudinal directions. Since the longitudinal extension rate is the largest after the battery pole piece is rolled, the longitudinal extension is increased by the stretching mechanism, so that the problem of wrinkling in the lug area will not occur after the pole piece is rolled and stretched; the calendering mechanism and the stretching mechanism work together to achieve the ideal lug extension effect, reduce the battery pole piece breakage rate, and improve the equipment production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 This is a schematic diagram of the structure of an embodiment of the present application;

[0023] Figure 2 This is a schematic diagram of the calendering mechanism structure of an embodiment of the present application;

[0024] Figure 3 This is a schematic diagram of the stretching mechanism structure of an embodiment of the present application;

[0025] Figure 4 This is a schematic diagram of the tensioning mechanism structure of an embodiment of the present application.

[0026] Reference numerals:

[0027] 10. Mechanism plate; 20. Calendering mechanism; 21. Calendering roller; 22. Calendering wheel; 23. Wedge block mechanism; 24. Lifting cylinder; 25. Support rod; 26. Support plate; 27. Push screw; 28. Support column;

[0028] 30. stretching mechanism; 31. differential roller; 32. support seat; 33. differential wheel; 34. cylinder; 40. lifting roller group; 41. mounting plate; 42. rotating roller; 43. adjusting screw rod;

[0029] 50. Support roller; 60. Guide roller; 70. Tensioning mechanism; 71. Pass roller; 72. Tension roller; 73. Tension control mechanism; 74. Swing rod; 75. Swing roller; 76. Swing roller cylinder; 80. Battery pole piece. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. 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.

[0031] The embodiment of the present application provides an extension mechanism for a battery pole piece, which can solve the technical problem in the related art that the battery pole piece is prone to breakage during the rolling process.

[0032] See also Figure 1 As shown, the embodiment of the present application provides an extension mechanism for a battery electrode, comprising:

[0033] The rolling mechanism 20 and the stretching mechanism 30 are connected to the mechanism plate 10 and sequentially stretch the battery pole piece 80 along the moving direction of the battery pole piece 80 . The rolling mechanism 20 and the stretching mechanism 30 drive the battery pole piece 80 to move while stretching the battery pole piece 80 .

[0034] The calendering mechanism 20 includes a calendering roller 21 and a calendering wheel 22 that move in directions of approaching or moving away from each other. The calendering roller 21 and the calendering wheel 22 rotate and roll with each other to extend the battery electrode 80 .

[0035] The stretching mechanism 30 includes a slow roller group and a fast roller group. The fast roller group is located downstream of the slow roller group. The slow roller group and the fast roller group drive the battery pole sheet 80 to move and form a speed difference to stretch the battery pole sheet 80.

[0036] The stretching mechanism for the battery pole piece of the embodiment of the present application uses the calendering mechanism 20 and the stretching mechanism 30 to respectively stretch the battery pole piece 80. The calendering mechanism 20 uses the calendering roller 21 and the calendering wheel 22 to roll the battery pole piece 80 to stretch the battery pole piece 80, and the stretching mechanism 30 uses the slow roller group and the fast roller group to drive the battery pole piece 80 to move and form a speed difference to stretch the battery pole piece 80.

[0037] The rolling mechanism 20 stretches the battery electrode 80 in both the horizontal and longitudinal directions. Since the longitudinal extension rate of the battery electrode 80 is the largest after being rolled, the longitudinal extension is increased by the stretching mechanism 30, so that the battery electrode 80 will not cause wrinkles in the ear area after being rolled and stretched.

[0038] The calendering mechanism 20 and the stretching mechanism 30 work together to roll and stretch the battery pole piece 80 that has passed through the calendering mechanism 20 and the stretching mechanism 30, respectively, to achieve an ideal pole tab extension effect, reduce the battery pole piece breakage rate, and improve the equipment production efficiency.

[0039] In some alternative embodiments: See Figure 1 and Figure 2 As shown, the embodiment of the present application provides an extension mechanism for a battery electrode sheet, wherein the calendering wheel 22 of the extension mechanism is provided with a lifting structure for driving it to approach or move away from the calendering roller 21. The lifting structure includes a wedge block mechanism 23, a lifting cylinder 24 located at the top of the wedge block mechanism 23, and a support rod 25 rotatably connected to the calendering wheel 22 is provided at the top of the lifting cylinder 24.

[0040] The wedge block mechanism 23 includes an upper wedge block and a lower wedge block that are slidably connected to each other. The upper wedge block and the lower wedge block are both right-angled trapezoidal structures. The inclined surfaces of the upper wedge block and the lower wedge block cooperate with each other and are slidably connected. The upper wedge block is fixedly connected to the lifting cylinder 24, and the bottom of the lower wedge block is slidably connected to a support plate 26, on which a push screw 27 and a handle for driving the lower wedge block to slide are provided.

[0041] The bottom of the support plate 26 is provided with a support column 28 connected to the mechanism plate 10, and the support column 28 supports the support plate 26, the wedge block mechanism 23, the lifting cylinder 24, the support rod 25 and the calendering wheel 22 to a set height. The calendering wheel 22 can be replaced with a calendering wheel 22 of different outer diameters according to the type of the battery electrode 80.

[0042] The length of the calendering wheel 22 is less than that of the calendering roller 21. The outer wall of the calendering wheel 22 is provided with a metal protrusion for extending the tab area of ​​the battery pole piece 80. When the force acting between the calendering wheel 22 and the calendering roller 21 is greater than the tab calendering threshold, the tab area is extended. After the calendering wheel 22 is replaced, the height of the wedge block mechanism 23 can be adjusted by rotating the push screw 27 with a handle, thereby adjusting the height of the lifting cylinder 24 to control the height and compression of the calendering wheel 22.

[0043] In some alternative embodiments: See Figure 1 and Figure 2As shown, the embodiment of the present application provides an extension mechanism for battery pole pieces, wherein the upstream and downstream of the calendering mechanism 20 of the extension mechanism are provided with a lifting roller group 40. The lifting roller group 40 includes a mounting plate 41 fixed on the mechanism plate 10, a rotating roller 42 is slidably connected to the mounting plate 41, and an adjusting screw rod 43 and a hand wheel for driving the rotating roller 42 to move up and down are also provided on the mounting plate 41.

[0044] There are two groups of lifting roller groups 40, which are respectively located upstream and downstream of the calendering mechanism 20. The lifting roller group 40 located upstream of the calendering mechanism 20 is used to adjust the height of the battery electrode 80 in front of the calendering mechanism 20 so that the height of the battery electrode 80 in front of the calendering mechanism 20 is kept flush with the height of the calendering roller 21.

[0045] The lifting roller group 40 located downstream of the calendering mechanism 20 is used to adjust the height of the battery pole piece 80 behind the calendering mechanism 20 so that the height of the battery pole piece 80 behind the calendering mechanism 20 is kept flush with the height of the calendering roller 21. When adjusting the height of the battery pole piece 80, the lifting roller group 40 drives the adjusting screw rod 43 to rotate by a hand wheel, and the adjusting screw rod 43 converts the rotation into the lifting movement of the rotating roller 42.

[0046] In some alternative embodiments: See Figure 1 and Figure 2 As shown, the embodiment of the present application provides an extension mechanism for a battery electrode sheet, and a support roller 50 is provided on the side of the calendering roller 21 of the extension mechanism away from the calendering wheel 22, and is in close contact with the calendering roller 21. The calendering roller 21 and the support roller 50 are both rotatably connected to the mechanism plate 10, and a servo motor is provided on the mechanism plate 10 to drive the calendering roller 21 and the support roller 50 to rotate respectively.

[0047] Since the length of the calendering wheel 22 is smaller than that of the calendering roller 21, and the calendering wheel 22 is arranged in the middle position of the calendering roller 21, when the lifting structure drives the calendering wheel 22 to move toward the calendering roller 21 to extrude and stretch the battery electrode 80, in order to prevent the calendering roller 21 from bending and deforming, a support roller 50 is provided on the side of the calendering roller 21 away from the calendering wheel 22, which is in close contact with the calendering roller 21, thereby suppressing the deformation of the calendering roller 21.

[0048] In some alternative embodiments: See Figure 1 and Figure 3 As shown, the embodiment of the present application provides an extension mechanism for a battery pole piece, wherein the slow roller group and the fast roller group of the extension mechanism both include a differential roller 31 rotatably connected to the mechanism plate 10, and a support seat 32 connected to the mechanism plate 10. A differential wheel 33 is rotatably connected to the support seat 32, and a cylinder 34 is connected to the support seat 32 to drive the differential wheel 33 to move in a direction close to or away from the differential roller 31.

[0049] The slow roller group and the fast roller group have the same structure, but the linear speed of the differential wheel 33 of the fast roller group is greater than the linear speed of the differential wheel 33 of the slow roller group. A speed difference is formed between the differential wheels 33 of the slow roller group and the fast roller group to drive the battery pole piece 80 to move. The fast roller group with a fast linear speed has a stretching effect on the battery pole piece 80, thereby extending and growing the battery pole piece 80.

[0050] In some alternative embodiments: See Figure 1 As shown, an embodiment of the present application provides an extension mechanism for a battery electrode, wherein a guide roller 60 connected to a large plate 10 of the mechanism is provided between a calendering mechanism 20 and a stretching mechanism 30 of the extension mechanism, and the guide roller 60 rotates to press down a battery electrode 80 so that the battery electrode 80 is attached to the stretching mechanism 30.

[0051] In some alternative embodiments: See Figure 1 As shown, an embodiment of the present application provides an extension mechanism for a battery electrode, and a tensioning mechanism 70 is also provided downstream of the stretching mechanism 30 of the extension mechanism. The tensioning mechanism 70 includes a roller 71 and a tension roller 72 connected to a large plate 10 of the mechanism, and a tension control mechanism 73 for adjusting the tension of the battery electrode 80 is provided between the roller 71 and the tension roller 72.

[0052] See also Figure 4 As shown, the tension control mechanism 73 includes a swing rod 74 rotatably connected to the mechanism plate 10 at one end, a swing roller 75 rotatably connected to the other end of the swing rod 74, and a swing roller cylinder 76 for driving the swing rod 74 to swing up and down is also connected to the middle position of the swing rod 74. The telescopic arm of the swing roller cylinder 76 is rotatably connected to the swing rod 74 through a pin shaft, and the cylinder body of the swing roller cylinder 76 is rotatably connected to the mechanism plate 10 through a pin shaft.

[0053] A tension sensor (not shown) is provided on the tension roller 72, and the tension sensor is connected to the swing roller cylinder 76 through a controller (not shown). The controller controls the extension and contraction of the swing roller cylinder 76 through the tension value of the battery pole piece 80 detected by the tension sensor. When the tension value of the battery pole piece 80 is greater than the set threshold, the swing roller cylinder 76 extends to an appropriate length, and when the tension value of the battery pole piece 80 is less than the set threshold, the swing roller cylinder 76 retracts to an appropriate length to accurately control the tension value of the battery pole piece 80. Prevent the battery pole piece 80 from being too tight or too loose.

[0054] How it works

[0055] An embodiment of the present application provides an extension mechanism for a battery electrode. The extension mechanism for a battery electrode of the present application is provided with a rolling mechanism 20 and a stretching mechanism 30 which are connected to a large plate 10 of the mechanism and sequentially stretch the battery electrode 80 along the moving direction of the battery electrode 80; wherein the rolling mechanism 20 includes a rolling roller 21 and a rolling wheel 22 which move in directions approaching or away from each other, and the rolling roller 21 and the rolling wheel 22 roll the battery electrode 80 against each other to extend the battery electrode 80; the stretching mechanism 30 includes a slow roller group and a fast roller group, and the slow roller group and the fast roller group drive the battery electrode 80 to move and form a speed difference to stretch the battery electrode 80.

[0056] Therefore, the stretching mechanism for the battery pole piece of the present application uses a calendering mechanism 20 and a stretching mechanism 30 to stretch the battery pole piece 80 respectively. The calendering mechanism 20 uses a calendering roller 21 and a calendering wheel 22 to roll the battery pole piece 80 against each other to stretch the battery pole piece 80, and the stretching mechanism 30 uses a slow roller group and a fast roller group to drive the battery pole piece 80 to move and form a speed difference to stretch the battery pole piece 80. The calendering mechanism 20 stretches the battery pole piece in both the horizontal and longitudinal directions. Since the longitudinal extension rate is the largest after the battery pole piece is rolled, the longitudinal extension is increased by the stretching mechanism 30, so that the problem of wrinkling in the ear area will not occur after the pole piece is rolled and stretched. The calendering mechanism 20 and the stretching mechanism 30 work together to achieve an ideal ear extension effect, reduce the breakage rate of the battery pole piece 80, and improve the production efficiency of the equipment.

[0057] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing 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 a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0058] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0059] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. An extension mechanism for a battery pole piece, characterized in that: include: A calendering mechanism (20) and a stretching mechanism (30) connected to the mechanism plate (10) and sequentially extending the battery pole piece (80) along the moving direction of the battery pole piece (80); The calendering mechanism (20) comprises a calendering roller (21) and a calendering wheel (22) which move in a direction approaching or moving away from each other, and the calendering roller (21) and the calendering wheel (22) roll against each other to extend the battery electrode sheet (80); The stretching mechanism (30) comprises a slow roller group and a fast roller group, and the slow roller group and the fast roller group drive the battery pole piece to move and form a speed difference to stretch the battery pole piece.

2. An extension mechanism for a battery pole piece according to claim 1, characterized in that: The calendering wheel (22) is provided with a lifting structure for driving it to approach or move away from the calendering roller (21), the lifting structure comprising a wedge block mechanism (23), a lifting cylinder (24) located at the top of the wedge block mechanism (23), and a support rod (25) rotatably connected to the calendering wheel (22) is provided at the top of the lifting cylinder (24).

3. An extension mechanism for a battery pole piece according to claim 2, characterized in that: The wedge block mechanism (23) comprises an upper wedge block and a lower wedge block which are slidably connected to each other, the upper wedge block is fixedly connected to the lifting cylinder (24), the bottom of the lower wedge block is slidably connected to a support plate (26), and the support plate (26) is provided with a push screw (27) and a handle for driving the lower wedge block to slide.

4. An extension mechanism for a battery pole piece according to any one of claims 1 to 3, characterized in that: A lifting roller group (40) is provided upstream and downstream of the calendering mechanism (20), and the lifting roller group (40) comprises a mounting plate (41), a rotating roller (42) is slidably connected to the mounting plate (41), and an adjusting screw rod (43) and a hand wheel for driving the rotating roller (42) to move up and down are also provided on the mounting plate (41).

5. An extension mechanism for a battery pole piece according to any one of claims 1 to 3, characterized in that: A supporting roller (50) which is in close contact with the calendering roller (21) is provided on the side of the calendering roller (21) facing away from the calendering wheel (22); the calendering roller (21) and the supporting roller (50) are rotatably connected to a large mechanism plate (10); and a servo motor is provided on the large mechanism plate (10) for driving the calendering roller (21) and the supporting roller (50) to rotate respectively.

6. The extension mechanism for a battery pole piece according to claim 1, characterized in that: The slow roller group and the fast roller group both comprise a differential roller (31) rotatably connected to a mechanism plate (10), and a support seat (32) connected to the mechanism plate (10), a differential wheel (33) rotatably connected to the support seat (32), and a cylinder (34) driving the differential wheel (33) to move in a direction approaching or away from the differential roller (31) is connected to the support seat (32).

7. The extension mechanism for a battery pole piece according to claim 1, characterized in that: A guide roller (60) connected to the mechanism plate (10) is provided between the calendering mechanism (20) and the stretching mechanism (30), and the guide roller (60) presses down the battery electrode sheet (80) so that the battery electrode sheet (80) is attached to the stretching mechanism (30).

8. The extension mechanism for a battery pole piece according to claim 1, characterized in that: A tensioning mechanism (70) is also provided downstream of the stretching mechanism (30), and the tensioning mechanism (70) comprises a roller (71) and a tension roller (72) connected to the mechanism plate (10), and a tension control mechanism (73) for adjusting the tension of the battery electrode sheet (80) is provided between the roller (71) and the tension roller (72).

9. An extension mechanism for a battery pole piece according to claim 8, characterized in that: The tension control mechanism (73) comprises a swing rod (74) having one end rotatably connected to the mechanism large plate (10), the other end of the swing rod (74) being rotatably connected to a swing roller (75), and the swing rod (74) is also connected to a swing roller cylinder (76) for driving the swing rod (74) to swing up and down.

10. An extension mechanism for a battery pole piece according to claim 9, characterized in that: The tension roller (72) is provided with a tension sensor, and the tension sensor is connected to the swing roller cylinder (76) through a controller. The controller controls the extension and contraction amount of the swing roller cylinder (76) according to the tension value detected by the tension sensor.

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