Pole piece flattening device and pole piece rolling equipment

Abstract

The utility model belongs to the technical field of batteries, and particularly relates to a pole piece flattening device and pole piece rolling equipment. The pole piece flattening device comprises a base and two flattening assemblies, the two flattening assemblies are arranged on the base, each flattening assembly comprises a fixed seat, a movable seat, a first roller, a second roller and a driving part, the fixed seats are arranged on the base, the first rollers are rotationally connected with the fixed seats, the second rollers are rotationally connected with the movable seats, and the first rollers and the second rollers are distributed in the first direction; the axes of the two rollers extend in the first axis direction, and the driving part is used for driving the moving seat and the second roller to move in the first direction; the first axes of the two flattening assemblies are arranged at an obtuse angle. The pole piece flattening device provided by the utility model can stretch and extend the pole piece which is rolled by the main roller and has wrinkles, so that the wrinkles on the pole piece are eliminated, and the smooth proceeding of subsequent procedures is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a pole piece flattening device and pole piece roll equipment. BACKGROUND

[0002] When the lithium ion battery is manufactured, first, the pole piece is formed by raw materials (aluminum, copper), then a plurality of active material strips capable of storing electric energy are coated on the surface of the pole piece, the active material strips extend along the length direction of the pole piece, and the plurality of active material strips are distributed at intervals along the width direction of the pole piece. The pole piece forms a coating area in the area where the active material strips are formed. Along the width direction of the pole piece, the pole piece forms an uncoated area on both sides of the plurality of coating areas and between the adjacent two coating areas.

[0003] When the pole piece is rolled to the designed compact thickness in the rolling process of the lithium battery, the coating area is extended in the longitudinal direction due to the pressure effect, and the uncoated area is not subjected to the pressure effect because the thickness is less than that of the coating area, that is, the uncoated area does not occur longitudinal extension, which causes the uncoated area to produce wrinkles, which may cause processing difficulty in the subsequent process, and even cause the belt to break, which has a significant impact on the yield. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at providing a pole piece flattening device and pole piece roll equipment, which can stretch and extend the pole piece after the pole piece is wrinkled by rolling, so as to eliminate the wrinkles on the pole piece.

[0005] In order to achieve this purpose, the utility model adopts the following technical scheme:

[0006] The pole piece flattening device comprises:

[0007] A base;

[0008] Two sets of flattening assemblies are arranged on the base, and each flattening assembly comprises a fixed seat, a moving seat, a first roller, a second roller and a driving member. The fixed seat is arranged on the base, the first roller is rotatably connected with the fixed seat, the second roller is rotatably connected with the moving seat, the first roller and the second roller are distributed along a first direction, and the axes of the two rollers extend along a first axis direction. The driving member is used to drive the moving seat and the second roller to move along the first direction. The first axes of the two sets of flattening assemblies are arranged at an obtuse angle.

[0009] The pole piece roll equipment comprises a main roller and the pole piece flattening device as described in the above scheme, and the pole piece flattening device is arranged downstream of the main roller.

[0010] The utility model has the advantages of:

[0011] The utility model provides a kind of pole piece flattening device, including base and two sets of flattening assembly, two sets of flattening assembly are all set in base, flattening assembly includes fixed seat, moving seat, first roller, second roller and driving part, fixed seat is set in base, first roller is rotatably connected with fixed seat, first roller and second roller are distributed along first direction, and the axis of both is extended along first axis direction, driving part is used to drive moving seat and second roller move along first direction;The first axis of two sets of flattening assembly is set as obtuse angle.Pole piece after passing through rolling process, then enter between second roller and first roller of two sets of flattening assembly, then the driving part in two sets of flattening assembly drives second roller to move along first direction to the side close to first roller, second roller and first roller are jointly compressed pole piece, because the first axis of two sets of flattening assembly is set as obtuse angle, therefore, when pole piece passes through two sets of flattening assembly, two sets of flattening assembly can stretch and spread pole piece against the wrinkle direction of pole piece, to eliminate the wrinkle on pole piece, to guarantee the smooth progress of subsequent process.

[0012] The utility model provides a kind of pole piece rolling equipment, including main roll and above-mentioned pole piece flattening device, pole piece flattening device is set in the downstream of main roll.Through setting above-mentioned pole piece flattening device, it can stretch and spread the pole piece after being rolled by main roll and generating wrinkle, to eliminate the wrinkle on pole piece. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is the structure schematic diagram of pole piece flattening device provided by the utility model embodiment;

[0014] Figure 2 It is the structure schematic diagram of the first visual angle of flattening assembly involved in the utility model embodiment;

[0015] Figure 3 It is the local structure schematic diagram of base involved in the utility model embodiment;

[0016] Figure 4 It is the structure schematic diagram of the second visual angle of flattening assembly involved in the utility model embodiment.

[0017] In the drawing:

[0018] 10, base;11, arc-shaped adjusting hole;20, flattening assembly;21, fixed seat;211, bottom plate;2111, connecting hole;212, top plate;213, connecting plate;214, first reinforcing plate;215, second reinforcing plate;22, moving seat;23, first roller;24, second roller;25, driving part;26, guide part. DETAILED DESCRIPTION

[0019] The utility model will be made further detailed description below combining with the drawings and examples. It can be understood that the specific examples described here are only used to explain the utility model, and not limited to the utility model. In addition, it should be noted that, in order to facilitate the description, only the part related to the utility model is shown in the drawings, not all structures.

[0020] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, it can be the communication inside two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0021] In the utility model, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can include direct contact of the first and second features, or indirect contact of the first and second features through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes the first feature directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "under", "below" and "below" the second feature includes the first feature directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0022] In the description of the embodiment, the terms "up", "down", "right", etc. orientation or position relationship is based on the orientation or position relationship shown in the drawing, only for the convenience of description and simplification operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0023] When the lithium ion battery is made, first, the raw material (aluminum, copper) is formed into a pole piece, and then a plurality of active material strips capable of storing electric energy are coated on the surface of the pole piece. The active material strips extend along the length direction of the pole piece, and the plurality of active material strips are distributed at intervals along the width direction of the pole piece. The pole piece in the area where the active material strips are formed is a coating area. Along the width direction of the pole piece, the pole piece forms an uncoated area on both sides of the plurality of coating areas and between the adjacent two coating areas.

[0024] When the lithium battery is rolled to the designed compact thickness in the rolling process, the coating area is stretched in the longitudinal direction due to the pressure, while the non-coating area is not stretched in the longitudinal direction due to the thickness being less than that of the coating area, which causes the non-coating area to be wrinkled, and the wrinkled non-coating area causes the difficulty in the subsequent process, and even the breakage of the strip, which has a significant impact on the yield.

[0025] To solve the above problems, the utility model discloses a kind of pole piece flattening devices, as shown in Figures 1 to 4 It includes base 10 and two sets of flattening components 20, two sets of flattening components 20 are set to base 10, flattening component 20 includes fixed seat 21, moving seat 22, first roller 23, second roller 24 and driving part 25, fixed seat 21 is set to base 10, first roller 23 is rotationally connected with fixed seat 21, second roller 24 is rotationally connected with moving seat 22, first roller 23 and second roller 24 are distributed along the first direction, and the axis of both extends along the first axis direction, driving part 25 is used to drive moving seat 22 and second roller 24 to move along the first direction, so that second roller 24 is close to or away from first roller 23;The first axis of two sets of flattening components 20 is set as obtuse angle.

[0026] After pole piece passes through rolling process, then enter between second roller 24 and first roller 23 of two sets of flattening components 20, then driving part 25 in two sets of flattening components 20 drives second roller 24 to move along the first direction to the side close to first roller 23, second roller 24 and first roller 23 are pressed tightly together pole piece, because the first axis of two sets of flattening components 20 is set as obtuse angle, therefore, when pole piece passes through two sets of flattening components 20, two sets of flattening components 20 can stretch and stretch pole piece against the wrinkle direction of pole piece, to eliminate the wrinkle on pole piece, to ensure the smooth progress of subsequent process.

[0027] Referring to Figure 2 In the embodiment, fixed seat 21 includes bottom plate 211, top plate 212 and connecting plate 213, bottom plate 211 and top plate 212 are arranged in parallel and spaced apart, connecting plate 213 is connected between bottom plate 211 and top plate 212, bottom plate 211 is connected with base 10, and moving seat 22 is arranged between bottom plate 211 and top plate 212. Fixed seat 21 is simple in structure, and facilitates the arrangement of other components. Further, to strengthen the structural strength of fixed seat 21, fixed seat 21 further includes first reinforcing plate 214 and second reinforcing plate 215, first reinforcing plate 214 is connected between bottom plate 211 and connecting plate 213, and second reinforcing plate 215 is connected between top plate 212 and connecting plate 213.

[0028] In the embodiment, the driving member 25 is a telescopic cylinder, the telescopic cylinder is fixed to the top plate 212 of the fixed seat 21, the telescopic end of the telescopic cylinder is connected with the moving seat 22, the telescopic cylinder extends out to drive the moving seat 22 and the second roller 24 to move towards the first roller 23, and the telescopic cylinder retracts to drive the moving seat 22 and the second roller 24 to move away from the first roller 23. Alternatively, the telescopic cylinder is a pneumatic cylinder or an electric cylinder. In other embodiments, the driving member 25 can also include a motor and a screw rod, the motor is arranged on the top plate 212 of the fixed seat 21, the motor shaft of the motor is drivingly connected with the screw rod, and the screw rod is threadedly connected with the moving seat 22. The motor can drive the screw rod to rotate, and the screw rod can convert the rotation into the movement of the moving seat 22.

[0029] Further, the flattening assembly 20 further includes a guide member 26, the guide member 26 is used for guiding the movement of the moving seat 22 and the second roller 24, so that the moving seat 22 and the second roller 24 do not deviate when moving.

[0030] In the embodiment, the guide member 26 is a guide rod, the top plate 212 of the fixed seat 21 is provided with a guide hole, the guide member 26 is slidably arranged in the guide hole, and one end of the guide member 26 is connected with the moving seat 22. Alternatively, the number of the guide members 26 is two, the two guide members 26 are symmetrically arranged on the two sides of the driving member 25, so that the movement of the moving seat 22 and the second roller 24 is more stable. Alternatively, a guide sleeve is arranged in the guide hole, and the guide member 26 is slidably matched with the guide sleeve. In other embodiments, the guide member 26 can also be a guide rail, the guide rail is arranged on the connecting plate 213 of the fixed seat 21, and the moving seat 22 is slidably matched with the guide rail.

[0031] Further, the flattening assembly 20 can be adjusted in position relative to the base 10 to adjust the included angle between the first axes of the two groups of flattening assemblies 20. Alternatively, the adjustment range of the included angle between the first axes of the two groups of flattening assemblies 20 is 160°-180°. In the embodiment, the included angle between the first axes of the two groups of flattening assemblies 20 is 170°, at this time, the effect of eliminating the pole piece wrinkles of the pole piece flattening device is best.

[0032] Referring to Figure 3 and Figure 4In the embodiment, the base 10 is provided with an arc-shaped adjusting hole 11, the bottom plate 211 of the fixing seat 21 is provided with a connecting hole 2111, and the connecting piece connects the fixing seat 21 and the base 10 through the connecting hole 2111 and the arc-shaped adjusting hole 11. The position of the flattening assembly 20 relative to the base 10 can be adjusted by connecting the connecting piece with the arc-shaped adjusting hole 11 at different positions, so that the included angle between the first axes of the two groups of flattening assemblies 20 is adjusted. Alternatively, the number of the arc-shaped adjusting holes 11 is multiple, and the arc-shaped adjusting holes 11 are circumferentially distributed; the number of the connecting holes 2111 and the connecting piece is equal to the number of the arc-shaped adjusting holes 11, and one-to-one correspondence is made, so that the connection between the fixing seat 21 and the base 10 is more stable. Alternatively, the base 10 is provided with an angle scale value, so as to facilitate the adjustment of the flattening assembly 20. In other embodiments, an adjusting piece can also be provided, an adjusting hole is formed in the fixing seat 21, the adjusting piece is threadedly connected with the adjusting hole, and one end of the adjusting piece is hinged to the fixing seat 21. The position of the flattening assembly 20 relative to the base 10 can be adjusted by adjusting the connecting position of the adjusting piece and the adjusting hole, so that the included angle between the first axes of the two groups of flattening assemblies 20 is adjusted.

[0033] Further, the pole piece flattening device further comprises a parallelism adjusting assembly for adjusting the parallelism between the first axes of the flattening assemblies 20 and the pole piece.

[0034] In the embodiment, the parallelism adjusting assembly comprises a plurality of feet, the plurality of feet are arranged at the bottom of the base 10 and are spaced apart along the length extension direction of the base 10, and the feet are threadedly connected with the base 10. The parallelism between the first axes of the flattening assemblies 20 and the pole piece can be adjusted by adjusting the connecting position of the feet and the base 10. In other embodiments, the parallelism adjusting module can also comprise a plurality of groups of gaskets, the plurality of groups of gaskets are arranged at the bottom of the base 10 and are spaced apart along the length extension direction of the base 10, each group of gaskets comprises a plurality of gaskets, and the parallelism between the first axes of the flattening assemblies 20 and the pole piece can be adjusted by adjusting the number of each group of gaskets.

[0035] The utility model embodiment further provides a pole piece roll equipment, including main roll and above-mentioned pole piece flattening device, pole piece flattening device sets up at the downstream of main roll. Through setting above-mentioned pole piece flattening device, can be stretched and spread after the pole piece that is rolled by main roll and generates fold, thereby eliminating the fold on the pole piece.

[0036] Obviously, the above embodiments of the present application are merely examples for clearly illustrating the present application, and are not intended to limit the implementation modes of the present application. For those skilled in the art, various obvious changes, re-adjustments and replacements can be made without departing from the protection scope of the present application. Here, it is not necessary and also impossible to enumerate all the implementation modes. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application claim.

Claims

1. A pole piece flattening device characterized by, The application relates to a pole piece flattening device. The pole piece flattening device comprises a base (10), two sets of flattening assemblies (20) arranged on the base (10), wherein each flattening assembly (20) comprises a fixed seat (21), a moving seat (22), a first roller (23), a second roller (24) and a driving member (25), the fixed seat (21) is arranged on the base (10), the first roller (23) is rotationally connected with the fixed seat (21), the second roller (24) is rotationally connected with the moving seat (22), the first roller (23) and the second roller (24) are distributed along a first direction, and the axes of the two rollers extend along a first axis direction, and the driving member (25) is used for driving the moving seat (22) and the second roller (24) to move along the first direction; the first axes of the two sets of flattening assemblies (20) are arranged at an obtuse angle. The driving member (25) is a telescopic cylinder, the telescopic cylinder is fixed on the fixed seat (21), and the telescopic end of the telescopic cylinder is connected with the moving seat (22).

2. The pole piece flattening device of claim 1, wherein The flattening assembly (20) further comprises a guide member (26) for guiding the movement of the moving seat (22) and the second roller (24).

3. The pole piece flattening device of claim 1, wherein, The fixed seat (21) is provided with a guide hole, and the guide member (26) is slidably arranged in the guide hole.

4. The pole piece flattening device of claim 3, wherein, The number of the guide members (26) is two, and the two guide members (26) are symmetrically arranged on the two sides of the driving member (25).

5. The pole piece flattening device of claim 4, wherein, The flattening assembly (20) can be positionally adjusted relative to the base (10) to adjust the included angle between the first axes of the two sets of flattening assemblies (20).

6. The pole piece flattening device of claim 1, wherein, The base (10) is provided with arc-shaped adjusting holes (11), the fixed seat (21) is provided with connecting holes (2111), and a connecting member connects the fixed seat (21) and the base (10) through the connecting holes (2111) and the arc-shaped adjusting holes (11).

7. The pole piece flattening device of claim 6, wherein, The number of the arc-shaped adjusting holes (11) is multiple, and the arc-shaped adjusting holes (11) are circumferentially distributed; the number of the connecting holes (2111) and the connecting member is equal to the number of the arc-shaped adjusting holes (11), and the connecting holes (2111) and the connecting member one-to-one correspond to the arc-shaped adjusting holes (11).

8. The pole piece flattening device of claim 7, wherein, The pole piece flattening device further comprises a parallelism adjusting assembly for adjusting the parallelism between the first axes and pole pieces.

9. The pole piece flattening device of any of claims 1-8, wherein, The pole piece flattening device is arranged downstream of a main roller.

10. A pole piece rolling apparatus characterized by, ​

Images