Pole piece and tape splicing method of pole piece

Abstract

The invention discloses a pole piece and a tape splicing method of the pole piece, the pole piece comprises a first pole piece tape, a second pole piece tape and an adhesive tape, and the first pole piece tape is provided with a first end part in the length direction of the first pole piece tape; the length direction of the second pole piece belt is the same as that of the first pole piece belt, and the second pole piece belt is provided with a second end part along the length direction of the second pole piece belt; the adhesive tape is attached to the surfaces of the first end part and the second end part, the adhesive tape comprises a base film and an adhesive layer, the base film comprises a coating area and a blank area, and the blank area is arranged around the coating area in a surrounding manner; the adhesive layer is coated on at least part of the coating area, and the coating area is respectively bonded with the surfaces of the first end part and the second end part through the adhesive layer.

Description

Technical Field

[0001] The present application relates to the field of battery manufacturing technology, and in particular to a pole piece and a method for connecting the pole pieces. Background Art

[0002] During the processes of rolling and slitting the battery's pole pieces, the pole pieces need to be spliced. In the prior art, the splicing is performed by attaching tape to the ends of the two pole pieces. However, when the joint of the pole pieces after splicing passes through the rolling assembly, the rolling assembly needs to release pressure until the joint leaves the rolling assembly, and then the rolling assembly re-pressurizes the pole pieces, thereby affecting the processing effect and efficiency of the pole pieces. Summary of the Invention

[0003] In view of the above-mentioned deficiencies in the prior art, the present invention provides a pole piece and a method for connecting pole pieces, which can improve the processing effect and efficiency of the pole piece.

[0004] In order to solve the above technical problems, in a first aspect, the present invention provides a pole piece, comprising:

[0005] A first pole piece strip, having a first end portion along a length direction of the first pole piece strip;

[0006] A second pole piece strip, wherein the length direction of the second pole piece strip is the same as the length direction of the first pole piece strip, and the second pole piece strip has a second end along the length direction of the second pole piece strip;

[0007] An adhesive tape is attached to surfaces of the first end portion and the second end portion, and the adhesive tape comprises:

[0008] A base film, the base film comprising a coating area and a blank area, the blank area being arranged around the coating area;

[0009] An adhesive layer is coated on at least a portion of the coating area, and the coating area is bonded to the surfaces of the first end portion and the second end portion respectively through the adhesive layer.

[0010] Since the blank area is arranged around the coating area and the adhesive layer is coated on at least part of the coating area, when the tape is used to connect the first electrode tape and the second electrode tape, the surface of the tape on one side with the adhesive layer will adhere to the surface of the first end and the second end, that is, the joint of the first electrode tape and the second electrode tape. When the rolling assembly does not release pressure to squeeze the joint of the first electrode tape and the second electrode tape to which the tape is adhered, the glue in the adhesive layer of the coating area will spread toward the surrounding areas. However, because the blank area is provided on the edges of the coating area, the glue spreading to the surrounding areas will not exceed the blank area. In other words, the glue spreading to the surrounding areas will be covered by the base film, thereby avoiding the glue in the adhesive layer from overflowing from the surrounding areas of the base film when squeezed by the rolling assembly, and further avoiding the situation where glue adheres to the surface of the rolling assembly, thereby ensuring the rolling effect of the rolling assembly on the electrode.

[0011] It can be seen that the tape with the above structure can avoid the need to relieve pressure on the rolling assembly when the first electrode tape and the second electrode tape are connected, which can not only ensure the rolling effect of the rolling assembly on the electrode, but also simplify the operation difficulty of the pre-slitting device.

[0012] In some possible implementations, the adhesive layer is applied to the entire coating area.

[0013] Since the adhesive layer is applied to the entire coating area, the contact area between the adhesive layer and the joint is increased during the joining process of the first electrode strip and the second electrode strip, thereby improving the firmness of the joint between the first electrode strip and the second electrode strip.

[0014] In some possible implementations, the adhesive layer is coated on a portion of the coating area.

[0015] Since the adhesive layer is coated on a partial coating area, during the process of joining the first electrode strip and the second electrode strip, the waste of the adhesive layer can be reduced while ensuring the joint connection effect of the first electrode strip and the second electrode strip, thereby reducing costs.

[0016] In some possible implementations, the portion of the coating area coated with the adhesive layer forms a coating portion, and the portion of the coating area not coated with the adhesive layer forms a spacing portion;

[0017] There are multiple gluing parts, and the spacing part is arranged between two adjacent gluing parts.

[0018] Since there are multiple glue coating parts and a spacer is set between two adjacent glue coating parts, when the tape with this structure is used to connect the seam of the first electrode band and the second electrode band, when the seam passes through the rolling assembly, the rolling assembly can squeeze part of the glue in the glue layer on the glue coating part toward the spacer. In this way, the contact area between the glue layer and the electrode is increased, and the joint effect of the first electrode band and the second electrode band is improved, and the glue in the glue layer is avoided from accumulating on one side of the coating area along the rolling direction of the rolling assembly, thereby improving the uniformity of the glue layer distribution.

[0019] In some possible implementations, the plurality of glue-coated portions are arranged at intervals along the length direction of the first pole piece strip.

[0020] Since multiple glue-coated portions are arranged at intervals along the length direction of the first electrode tape, and when the tape connects the seam of the first electrode tape and the second electrode tape, the length direction of the tape is the same as the extension direction of the seam. In other words, the width direction of the first electrode tape is the same as the width direction of the first electrode tape. In addition, the rolling direction of the rolling assembly is parallel to the length direction of the first electrode tape. Therefore, when the rolling assembly completes rolling the first electrode tape and the second electrode tape, it can push most of the glue in the glue layer on the glue-coated portion to spread along a direction parallel to the length direction of the first electrode tape and from one side of the base film to the other side. As a result, part of the glue in the glue layer on the glue-coated portion can fill at least part of the adjacent spacing portion. On the premise of avoiding the glue in the glue layer overflowing from the base film, it can not only ensure the bonding area between the glue layer and the electrode, but also avoid the accumulation of glue in the glue layer, thereby improving the uniformity of the glue layer distribution and the splicing effect.

[0021] In some possible implementations, the blank area includes a first blank area and a second blank area provided on both sides of the coating area along the length direction of the first electrode strip;

[0022] Along the arrangement direction of the plurality of glue-coated portions, the width of the spacer portion is equal to the width of the second blank area, and the width of the second blank area is greater than the width of the first blank area.

[0023] Since the rolling direction of the rolling assembly is consistent with the direction from the first blank area to the second blank area, when the rolling assembly rolls the tape to connect the first electrode tape and the second electrode tape, more glue in the glue layer on the glue coating part can be squeezed along the direction from the first blank area to the second blank area. As a result, more glue in the glue layer on the glue coating part will spread in the spacer part and the second blank area. In order to avoid glue overflow and ensure the connecting effect of the tape, the width of the spacer part is equal to the width of the second blank area, and the width of the second blank area is greater than the width of the first blank area.

[0024] In some possible implementations, the plurality of glue-coated portions are arranged at intervals along the width direction of the first pole piece strip.

[0025] Since the multiple glue-coated portions are arranged at intervals along the width direction of the first electrode tape, the arrangement direction of the multiple glue-coated portions is perpendicular to the rolling direction of the rolling assembly. Therefore, when the rolling assembly rolls the first electrode tape and the second electrode tape of the tape joint of this structure, a part of the glue in the glue layer on the glue-coated portion spreads along the arrangement direction intervals of the multiple glue-coated portions, and the other part spreads along the rolling direction intervals of the rolling assembly.

[0026] It can be seen that with the above-mentioned tape structure, when joining the first electrode tape and the second electrode tape, there is no need to deliberately align the glue coating portion with the seam between the first electrode tape and the second electrode tape, which simplifies the difficulty of joining the tapes. At the same time, since part of the glue in the glue layer on the glue coating portion spreads to the spacer portion, the bonding area between the glue layer and the electrode is increased, thereby ensuring the joining effect of the first electrode tape and the second electrode tape.

[0027] In some possible implementations, the blank area includes a first blank area and a second blank area arranged on both sides of the coating area along the length direction of the first electrode strip, and the width of the second blank area is greater than the width of the first blank area.

[0028] Since the rolling direction is the same as the direction from the first blank area to the second blank area, when the rolling assembly rolls the connected electrode, part of the glue in the glue layer on the glue coating part can be squeezed toward the second blank area. It can be seen that more glue in the glue layer on the glue coating part spreads toward the second blank area. Therefore, in order to avoid glue overflowing from the second blank area, the width of the second blank area is made greater than the width of the first blank area.

[0029] In some possible implementations, the plurality of glue-coated portions are spaced apart along a direction inclined relative to a width direction of the first pole piece strip.

[0030] Since the multiple glue-coated portions are arranged at intervals along a direction inclined relative to the width direction of the first electrode tape, the width of the glue layer covering the seam is extended, thereby improving the connection effect between the first electrode tape and the second electrode tape. In addition, when the rolling assembly is rolled, the glue in the glue layer on the glue-coated portion can spread to the spacing portion to increase the bonding area between the electrode and the tape, and in addition, the waste of glue is reduced.

[0031] In some possible implementations, the glue coating portion is in the shape of an elongated strip, and the width direction of the elongated strip is parallel to the arrangement direction of the plurality of glue coating portions.

[0032] Compared with the sheet-shaped gluing portion, the long strip-shaped gluing portion can, on the one hand, reduce the waste of glue while meeting the splicing effect; on the other hand, when the rolling assembly rolls the first pole piece tape and the second pole piece tape together, it can avoid the glue in the glue layer from accumulating on one side of the coating area, thereby ensuring the uniformity of the glue layer.

[0033] In some possible implementations, the glue-coating portion is wavy, and a width direction of the wavy shape is parallel to an arrangement direction of the plurality of glue-coating portions.

[0034] Since the glue-coated portion is wavy, a wavy glue layer is applied on the glue-coated portion of the same length along the length direction of the base film, which can extend the length of the wavy glue layer. Similarly, the same is true along the width direction of the base film. As a result, the contact area between the glue layer and the electrode is increased, thereby improving the effect of connecting the first electrode band and the second electrode band.

[0035] In some possible implementations, the plurality of glue coating portions are distributed in a dotted manner in the coating area.

[0036] Since the multiple glue-coated parts are distributed in a point-like manner, spacers are provided on the edges of each glue-coated part. Therefore, when the rolling assembly rolls the first electrode tape and the second electrode tape together, the glue in the glue layer on the glue-coated part will spread to the surrounding areas, which can not only ensure the bonding area between the tape and the seam between the first electrode tape and the second electrode tape when joining the tapes, but also avoid the glue overflowing from the base film, further improving the rolling effect of the rolling assembly and simplifying the operation difficulty of the rolling pre-slitting device.

[0037] In some possible implementations, the glue coating portion is circular or polygonal.

[0038] Since the circular or polygonal structure is simple and easy to design, when the gluing portion is circular or polygonal, the difficulty of designing the gluing portion can be simplified.

[0039] In some possible implementations, the width of the glue coating portion is d1, the width of the spacer portion is d2, and 1≤d1 / d2≤2.

[0040] Therefore, through comprehensive consideration, 1≤d1 / d2≤2 is achieved, which can not only ensure the splicing effect of the first electrode strip and the second electrode strip, but also avoid glue overflow and accumulation of the glue layer due to squeezing of the rolling assembly.

[0041] In some possible implementations, the blank area includes a first blank area and a second blank area arranged on both sides of the coating area along the length direction of the first pole piece band, and a third blank area and a fourth blank area arranged on both sides of the coating area along the width direction of the first pole piece band, and the widths of the first blank area and the second blank area are both greater than the widths of the third blank area and the fourth blank area.

[0042] Since the rolling direction of the rolling assembly points from the first blank area to the direction of the second blank area, or from the second blank area to the direction of the first blank area, when the rolling assembly squeezes the first electrode tape and the second electrode tape that have been spliced, the glue in the glue layer on the coating area can spread toward the second blank area or toward the first blank area. It can be seen that very little glue in the glue layer on the coating area spreads toward the third blank area or the fourth blank area. Therefore, the widths of the first blank area and the second blank area are both larger than the widths of the third blank area and the fourth blank area, which can not only ensure the splicing effect but also avoid glue overflow.

[0043] In some possible implementations, in the length direction of the first pole piece strip, the widths of the first blank area and the second blank area are both d, the width of the base film is D, and 1 / 7≤d / D≤1 / 4.

[0044] Therefore, 1 / 7≤d / D≤1 / 4, which can avoid glue overflow and improve the connection effect between the first electrode strip and the second electrode strip.

[0045] In some possible implementations, four corners of the base film are chamfered.

[0046] By providing chamfers at all four corners of the base film, the edge of the base film can be easily aligned with the edge of the electrode, further improving the connection effect between the first electrode band and the second electrode band.

[0047] In a second aspect, the present application further provides a method for splicing a pole piece, the method being used to splice the pole piece described in any one of the first aspects, the tape comprising a first tape, a second tape, and a third tape, the method comprising:

[0048] aligning a first end of the first pole piece strip and a second end of the second pole piece strip;

[0049] Attaching the first adhesive tape to the surfaces of the first end portion and the second end portion along the width direction of the first electrode strip;

[0050] Attaching the second adhesive tape to the surface of the first adhesive tape close to the first side edge of the first electrode strip in the width direction and the surfaces of the first electrode strip and the second electrode strip close to the first side edge along the length direction of the first electrode strip;

[0051] The third tape is attached to the surface of the first tape close to the second side of the first tape in the width direction and the surfaces of the first and second tapes close to the second side along the length direction of the first electrode tape.

[0052] Therefore, by attaching the second tape to the surface of the first tape close to the first side edge and the surfaces of the first electrode strip and the second electrode strip close to the first side edge, and by attaching the third tape to the surface of the first tape close to the second side edge and the surfaces of the first electrode strip and the second electrode strip close to the second side edge, the bonding strength of the tape to the first electrode strip and the second electrode strip can be strengthened. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0054] Figure 1 A schematic structural diagram of an adhesive tape provided in an embodiment of the present invention;

[0055] Figure 2a Schematic diagram of adhesive overflow after the adhesive tape is squeezed by the roller pressing assembly after being spliced ​​in the prior art;

[0056] Figure 2b A schematic diagram of the changes in the adhesive layer of the adhesive tape after being squeezed by a rolling assembly after the adhesive tape is spliced ​​according to an embodiment of the present invention;

[0057] Figure 2c A schematic structural diagram of a pole piece rolling assembly after tape splicing provided by an embodiment of the present invention;

[0058] Figure 3 A schematic diagram of a second structure of the adhesive tape provided in an embodiment of the present invention;

[0059] Figure 4 for Figure 3 Another structural diagram of the middle tape;

[0060] Figure 5 A schematic diagram of a third structure of the adhesive tape provided in an embodiment of the present invention;

[0061] Figure 6 for Figure 5 Another structural diagram of the middle tape;

[0062] Figure 7 A schematic diagram of a fourth structure of the adhesive tape provided in an embodiment of the present invention;

[0063] Figure 8 A fifth structural schematic diagram of the adhesive tape provided in an embodiment of the present invention;

[0064] Figure 9 A sixth structural schematic diagram of the adhesive tape provided in an embodiment of the present invention;

[0065] Figure 10 A seventh structural schematic diagram of the adhesive tape provided in an embodiment of the present invention;

[0066] Figure 11 This is a schematic diagram of an eighth structure of the adhesive tape provided by an embodiment of the present invention;

[0067] Figure 12 for Figure 1 Another structural diagram of the tape;

[0068] Figure 13 A schematic structural diagram of an adhesive tape with chamfered corners provided in an embodiment of the present invention;

[0069] Figure 14 A schematic diagram of the structure of a film provided in an embodiment of the present invention;

[0070] Figure 15 A top view of the adhesive tape after being spliced ​​provided by an embodiment of the present invention;

[0071] Figure 16 A flow chart of a method for connecting pole pieces provided in an embodiment of the present invention.

[0072] Description of reference numerals:

[0073] 11-rolled assembly; 12-pole piece; 12a-first pole piece strip; 12b-second pole piece strip;

[0074] 100 - tape; 100a - first tape; 100b - second tape; 100c - third tape; 110 - base film; 111 - coating area; 1111 - adhesive coating portion; 1112 - spacer; 112 - blank area; 1121 - first blank area; 1122 - second blank area; 1123 - third blank area; 1124 - fourth blank area; 113 - chamfer; 120 - adhesive layer;

[0075] 200-film. DETAILED DESCRIPTION

[0076] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0077] In the present invention, terms such as "upper," "lower," "left," "right," "front," "back," "top," "bottom," "inner," "outer," "vertical," "horizontal," "transverse," and "longitudinal" indicate positions or locations based on the positions or locations shown in the accompanying drawings. These terms are primarily intended to better describe the present invention and its embodiments and are not intended to limit the devices, elements, or components indicated to having a specific orientation, or to being constructed or operated in a specific orientation.

[0078] Furthermore, some of the above terms may be used to express other meanings besides indicating a position or location. For example, the term "on" may also be used to indicate a dependency or connection in certain circumstances. Those skilled in the art will understand the specific meanings of these terms in the present invention based on the specific circumstances.

[0079] Furthermore, the terms "installed," "disposed," "provided with," "connected," and "connected" should be interpreted broadly. For example, they can refer to fixed connections, removable connections, or integral structures; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; or internal communication between two devices, elements, or components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on specific circumstances.

[0080] Furthermore, the terms "first," "second," etc., are primarily used to distinguish between different devices, elements, or components (which may or may not be of the same type and configuration), and are not intended to indicate or imply the relative importance or quantity of the devices, elements, or components indicated. Unless otherwise specified, "plurality" means two or more.

[0081] The present application is described in detail below through specific embodiments:

[0082] See also Figure 1 、 Figure 2a 、 Figure 2b and Figure 2c, an embodiment of the present application provides a pole piece 12, a first pole piece band 12a, a second pole piece band 12b and an adhesive tape 100, wherein the first pole piece band 12a has a first end along the length direction of the first pole piece band 12a; the length direction of the second pole piece band 12b is the same as the length direction of the first pole piece band 12a, and the second pole piece band 12b has a second end along the length direction of the second pole piece band 12b; the adhesive tape 100 is attached to the surface of the first end and the second end, and the adhesive tape 100 includes a base film 110 and an adhesive layer 120, the base film 110 includes a coating area 111 and a blank area 112, and the blank area 112 is arranged around the coating area 111; the adhesive layer 120 is coated on at least a portion of the coating area 111, and the coating area 111 is bonded to the surfaces of the first end and the second end respectively through the adhesive layer 120.

[0083] The length direction of the first electrode strip 12a and the length direction of the second electrode strip 12b are both Figure 2c In the direction indicated by the X arrow, the base film 110 is rectangular or approximately rectangular. The adhesive layer 120 is coated on at least a portion of the coating area 111, which means that the adhesive layer 120 is coated on the entire coating area 111 or a portion of the coating area 111.

[0084] Since the blank area 112 is arranged around the coating area 111, and the adhesive layer 120 is coated on at least a portion of the coating area 111, when the adhesive tape 100 is used to connect the first electrode tape 12a and the second electrode tape 12b, the side surface of the adhesive tape 100 having the adhesive layer 120 will adhere to the surface of the first end portion and the second end portion, that is, the joint of the first electrode tape 12a and the second electrode tape 12b. When the rolling assembly 11 does not release pressure to squeeze the joint of the first electrode tape 12a and the second electrode tape 12b adhered to the adhesive tape 100, the adhesive in the adhesive layer 120 of the coating area 111 will spread all around. However, since the blank area 112 is provided on the edges of the coating area 111, the adhesive spread all around will not exceed the blank area 112. Figure 2a and 2b As shown, that is to say, the glue spreading to the surroundings will be covered by the base film 110, thereby preventing the glue in the glue layer 120 from overflowing from the surroundings of the base film 110 when squeezed, and further preventing the glue from adhering to the surface of the rolling component 11, thereby ensuring the rolling effect of the rolling component 11 on the first electrode strip 12a and the second electrode strip 12b.

[0085] It can be seen that the use of the tape 100 in this embodiment can eliminate the need to relieve pressure on the rolling assembly 11 when the first electrode strip 12a and the second electrode strip 12b are formed. This can not only ensure the rolling effect of the rolling assembly 11 on the first electrode strip 12a and the second electrode strip 12b, but also simplify the operation difficulty of the pre-slitting device.

[0086] In addition, the length direction of the first electrode strip 12 a is also the longitudinal direction of the electrode 12 , which is the same as the rolling direction of the rolling assembly 11 .

[0087] In some possible embodiments, see Figure 1 , the adhesive layer 120 is coated on the entire coating area 111 .

[0088] Since the adhesive layer 120 is coated on the entire coating area 111, during the process of joining the first electrode strip 12a and the second electrode strip 12b, the contact area between the adhesive layer 120 and the joint between the first electrode strip 12a and the second electrode strip 12b is increased, thereby improving the firmness of the joint between the first electrode strip 12a and the second electrode strip 12b.

[0089] In addition, it should be noted that the shape of the coating area 111 includes but is not limited to circular, rectangular, trapezoidal, elliptical and other shapes.

[0090] In some possible embodiments, see Figure 3 , the adhesive layer 120 is coated on a portion of the coating area 111 .

[0091] Since the adhesive layer 120 is coated on the partial coating area 111, during the process of joining the first electrode strip 12a and the second electrode strip 12b, the waste of the adhesive layer 120 can be reduced while ensuring the joint connection effect of the first electrode strip 12a and the second electrode strip 12b, thereby reducing costs.

[0092] In some possible embodiments, see Figure 3 The portion of the coating area 111 coated with the adhesive layer 120 forms a coating portion 1111 , and the portion of the coating area 111 not coated with the adhesive layer 120 forms a spacer 1112 ; there are multiple coating portions 1111 , and a spacer 1112 is set between two adjacent coating portions 1111 .

[0093] The above-mentioned multiple glue coating parts 1111 refer to two or more glue coating parts 1111. For example, see Figure 4 The gluing parts 1111 include three, a spacer 1112 is provided between every two adjacent gluing parts 1111 , and the two gluing parts 1111 close to the edge are connected to the blank area 112 on one side away from the spacer 1112 .

[0094] Since there are multiple glue coating parts 1111, a spacer 1112 is set between two adjacent glue coating parts 1111. Therefore, after the tape 100 using this structure connects the seam of the first electrode tape 12a and the second electrode tape 12b, when the seam passes through the rolling assembly 11, the rolling assembly 11 can squeeze part of the glue in the glue layer 120 on the glue coating part 1111 toward the spacer 1112. In this way, the contact area between the glue layer 120 and the seam between the first electrode tape 12a and the second electrode tape 12b can be increased, thereby improving the seam effect of the first electrode tape 12a and the second electrode tape 12b, and avoiding the glue in the glue layer 120 from accumulating on one side of the coating area 111 along the rolling direction of the rolling assembly 11, thereby improving the uniformity of the distribution of the glue layer 120.

[0095] In addition, the distribution of the above-mentioned glue coating part 1111 in the coating area 111 has various structures. In some possible embodiments, see Figure 4 , multiple glue-coated portions 1111 are arranged at intervals along the length direction of the first electrode strip 12a.

[0096] The length direction of the first pole piece strip 12a is Figure 4 The direction indicated by the X arrow in the figure, and the length direction of the first pole piece strip 12a mentioned below all refer to the direction indicated by the X arrow.

[0097] Since the plurality of adhesive coating portions 1111 are arranged at intervals in the length direction of the first electrode strip 12a, and when the adhesive tape 100 connects the seam of the first electrode strip 12a and the second electrode strip 12b, the length direction of the adhesive tape 100 is the same as the extending direction of the seam. In other words, the width direction of the first electrode strip 12a (i.e. Figure 4 The direction indicated by the Y arrow in the figure, the length direction of the first electrode tape 12a mentioned below refers to the direction indicated by the Y arrow) is the same as the width direction of the first electrode tape 12a and the second electrode tape 12b. In addition, the rolling direction of the rolling assembly 11 is parallel to the length direction of the first electrode tape 12a. Therefore, when the rolling assembly 11 is rolling the first electrode tape 12a and the second electrode tape 12b, it can push most of the glue in the glue layer 120 on the glue coating portion 1111 along the first electrode tape 12a. The direction is parallel to the length direction and spreads from one side of the base film 110 to the other side. Therefore, part of the glue in the glue layer 120 on the glue-coated portion 1111 can fill at least part of the adjacent spacer 1112. Under the premise of preventing the glue in the glue layer 120 from overflowing from the base film 110, it can ensure the bonding area between the glue layer 120 and the seam between the first electrode strip 12a and the second electrode strip 12b, and avoid the accumulation of glue in the glue layer 120, thereby improving the uniformity of the distribution of the glue layer 120 and the splicing effect.

[0098] In some possible embodiments, see Figure 4The blank area 112 includes a first blank area 1121 and a second blank area 1122 arranged on both sides of the coating area 111 along the length direction of the first electrode strip 12a; along the arrangement direction of the multiple glue coating parts 1111, the width of the spacer 1112 is equal to the width of the second blank area 1122, and the width of the second blank area 1122 is greater than the width of the first blank area 1121.

[0099] In this embodiment, the arrangement direction of the plurality of adhesive coating portions 1111 is the same as the length direction of the first electrode strip 12 a .

[0100] Since the rolling direction of the rolling component 11 is consistent with the direction of the first blank area 1121 pointing to the second blank area 1122 (that is, the direction indicated by the arrow X1 in the figure), when the rolling component 11 rolls the tape 100 to connect the first electrode tape 12a and the second electrode tape 12b, the more glue in the glue layer 120 of the glue coating part 1111 can be squeezed along the direction of the first blank area 1121 pointing to the second blank area 1122. As a result, more glue in the glue layer 120 of the glue coating part 1111 will spread in the spacer 1112 and the second blank area 1122. In order to avoid glue overflow and ensure the connecting effect of the tape 100, the width of the spacer 1112 is equal to the width of the second blank area 1122, and the width of the second blank area 1122 is greater than the width of the first blank area 1121.

[0101] In some other possible embodiments, see Figure 5 , multiple glue-coated portions 1111 are arranged at intervals along the width direction of the first electrode strip 12a.

[0102] Since the multiple glue-coated portions 1111 are arranged at intervals along the width direction of the first electrode tape 12a, the arrangement direction of the multiple glue-coated portions 1111 is perpendicular to the rolling direction of the rolling component 11. Therefore, when the rolling component 11 rolls the first electrode tape 12a and the second electrode tape 12b of the tape 100 of this structure, a portion of the glue in the glue layer 120 on the glue-coated portion 1111 spreads to the interval portion 1112 along the arrangement direction of the multiple glue-coated portions 1111, and the other portion spreads to the interval portion along the rolling direction of the rolling component 11.

[0103] It can be seen that in the structure of the tape 100 in this embodiment, when the first electrode tape 12a and the second electrode tape 12b are connected, there is no need to deliberately align the glue coating portion 1111 with the seam between the first electrode tape 12a and the second electrode tape 12b, which simplifies the difficulty of connecting the tape 100. At the same time, since part of the glue in the glue layer 120 on the glue coating portion 1111 spreads to the spacer portion 1112, the bonding area between the glue layer 120 and the seam between the first electrode tape 12a and the second electrode tape 12b is increased, thereby ensuring the connecting effect of the first electrode tape 12a and the second electrode tape 12b.

[0104] In some possible embodiments, see Figure 6 The blank area 112 includes a first blank area 1121 and a second blank area 1122 arranged on both sides of the coating area 111 along the length direction of the first electrode strip 12a, and the width of the second blank area 1122 is greater than that of the first blank area 1121.

[0105] Since the rolling direction is the same as the direction of the first blank area 1121 pointing to the second blank area 1122, when the rolling assembly 11 rolls the first electrode strip 12a and the second electrode strip 12b together, part of the glue in the glue layer 120 on the glue coating part 1111 can be squeezed toward the second blank area 1122. It can be seen that more glue in the glue layer 120 on the glue coating part 1111 spreads toward the second blank area 1122. Therefore, in order to avoid the glue overflowing from the second blank area 1122, the width of the second blank area 1122 is made greater than the width of the first blank area 1121.

[0106] In some possible embodiments, see Figure 7 and Figure 8 The plurality of glue-coated portions 1111 are arranged at intervals along a direction inclined relative to the width direction of the first electrode strip 12 a.

[0107] In this embodiment, the arrangement direction of the plurality of glue coating parts 1111 is as follows: Figure 7 In the direction indicated by the arrow z1, or as Figure 8 In the direction indicated by the arrow z2, in addition, the angle at which the glue coating portion 1111 is tilted relative to the width direction of the first pole piece band 12a is not limited. For example, the angle at which the glue coating portion 1111 is tilted relative to the width direction of the first pole piece band 12a includes but is not limited to 30° to 60°, or 120° to 150°, etc.

[0108] Since the multiple glue-coating portions 1111 are arranged at intervals along a direction inclined relative to the width direction of the first electrode strip 12a, the width of the seam covered by the glue layer 120 is extended, thereby improving the connection effect between the first electrode strip 12a and the second electrode strip 12b. In addition, when the rolling assembly 11 is rolled, the glue in the glue layer 120 on the glue-coating portion 1111 can spread to the spacing portion 1112 to increase the bonding area between the seam of the first electrode strip 12a and the second electrode strip 12b and the tape 100, and in addition, the waste of glue is reduced.

[0109] In addition, the shape of the glue coating portion 1111 can be various. In a possible embodiment, see Figure 4 、 Figure 5 The gluing portion 1111 is in the shape of an elongated strip, and the width direction of the elongated strip is parallel to the arrangement direction of the multiple gluing portions 1111 .

[0110] The long strip may be a rectangle, a parallelogram, or the like.

[0111] Compared with the sheet-shaped glue coating part 1111, the long strip-shaped glue coating part 1111 can, on the one hand, reduce the waste of glue while meeting the splicing effect; on the other hand, when the rolling assembly 11 rolls the first electrode tape and the second electrode tape 12 together, it can avoid the glue in the glue layer 120 from accumulating on one side of the coating area 111, thereby ensuring the uniformity of the glue layer 120.

[0112] In some possible embodiments, see Figure 9 The glue coating portion 1111 is wavy, and the width direction of the wavy shape is parallel to the arrangement direction of the multiple glue coating portions 1111.

[0113] Since the glue coating portion 1111 is wavy, a wavy glue layer 120 is applied on the glue coating portion 1111 of the same length along the length direction of the base film 110, which can extend the length of the wavy glue layer 120. Similarly, the same is true along the width direction of the base film 110. As a result, the contact area between the glue layer 120 and the seam between the first electrode strip 12a and the second electrode strip 12b is increased, thereby improving the effect of connecting the first electrode strip 12a and the second electrode strip 12b.

[0114] In some possible embodiments, see Figure 10 and Figure 11 , multiple glue coating parts 1111 are distributed in a dotted manner in the coating area 111.

[0115] Since the multiple glue-coating portions 1111 are distributed in a point-like manner, a spacer portion 1112 is provided on the four edges of each glue-coating portion 1111. Therefore, when the rolling assembly 11 rolls the first electrode tape 12a and the second electrode tape 12b together, the glue in the glue layer 120 on the glue-coating portion 1111 will spread to the four sides, which can not only ensure the bonding area between the adhesive tape 100 and the seam between the first electrode tape 12a and the second electrode tape 12b when joining the tapes, but also avoid the glue overflowing from the base film 110, further improving the rolling effect of the rolling assembly 11 and simplifying the operation difficulty of the rolling pre-slitting device.

[0116] In some possible embodiments, see Figure 10 and Figure 11 The glue coating portion 1111 is circular or polygonal.

[0117] The circle may be a perfect circle, an ellipse, etc., and the polygon may be a triangle, a square, a rectangle, a pentagon, etc.

[0118] Since the circular or polygonal structure is simple and easy to design, when the glue coating portion 1111 is circular or polygonal, the design difficulty of the glue coating portion 1111 can be simplified.

[0119] In some possible embodiments, see Figure 4 The width of the glue coating portion 1111 is d1, the width of the spacer portion 1112 is d2, and 1≤d1 / d2≤2.

[0120] If the ratio of d1 / d2 is less than 1, it means that the width of the spacer 1112 is too large and the width of the glue coating portion 1111 is too small. At this time, the bonding area between the glue layer 120 and the seam between the first electrode strip 12a and the second electrode strip 12b is small, thereby affecting the bonding effect of the first electrode strip 12a and the second electrode strip 12b. If the ratio of d1 / d2 is greater than 2, it means that the width of the spacer 1112 is too small and the width of the glue coating portion 1111 is too large. Although the bonding effect of the first electrode strip 12a and the second electrode strip 12b can be guaranteed, However, since the glue coating portion 1111 is too large, there is more glue in the glue layer 120 on the glue coating portion 1111. When the rolling component 11 squeezes the first electrode tape 12a and the second electrode tape 12b that have been spliced, glue overflow or accumulation of the glue layer 120 is likely to occur. Therefore, through comprehensive consideration, 1≤d1 / d2≤2 is made, which can not only ensure the splicing effect of the first electrode tape 12a and the second electrode tape 12b, but also avoid glue overflow and accumulation of the glue layer 120 due to squeezing by the rolling component 11.

[0121] In some possible embodiments, see Figure 12 The blank area 112 includes a first blank area 1121 and a second blank area 1122 arranged on both sides of the coating area 111 along the length direction of the first electrode strip 12a, and a third blank area 1123 and a fourth blank area 1124 arranged on both sides of the coating area 111 along the width direction of the first electrode strip 12a. The widths of the first blank area 1121 and the second blank area 1122 are both greater than the widths of the third blank area 1123 and the fourth blank area 1124.

[0122] Since the rolling direction of the rolling component 11 is along the first blank area 1121 to the direction of the second blank area 1122, or, along the second blank area 1122 to the direction of the first blank area 1121, when the rolling component 11 squeezes the first electrode tape 12a and the second electrode tape 12b that have been spliced, the glue in the glue layer 120 in the coating area 111 can spread toward the second blank area 1122 or toward the first blank area 1121. It can be seen that very little glue in the glue layer 120 in the coating area 111 spreads toward the third blank area 1123 or the fourth blank area 1124. Therefore, the widths of the first blank area 1121 and the second blank area 1122 are both larger than the widths of the third blank area 1123 and the fourth blank area 1124, which can not only ensure the splicing effect but also avoid glue overflow.

[0123] In some possible embodiments, see Figure 12In the length direction of the first electrode strip 12a, the widths of the first blank area 1121 and the second blank area 1122 are both d, the width of the base film 110 is D, and 1 / 7≤d / D≤1 / 4.

[0124] If the ratio of d / D is less than 1 / 7, it means that the coating area 111 is large, then the adhesive layer 120 arranged in the coating area 111 is large, and the first blank area 1121 and the second blank area 1122 are small. Therefore, when the rolling assembly 11 rolls the first electrode strip 12a and the second electrode strip 12b together, the rolling assembly 11 is likely to squeeze the adhesive layer 120 in the coating area 111 beyond the first blank area 1121 or the second blank area 1122, thereby causing glue overflow. If the ratio of d / D is greater than 1 / 4, it means that the coating area 111 is large. The area 111 is relatively small, and the first blank area 1121 and the second blank area 1122 are relatively large. When the first electrode tape 12a and the second electrode tape 12b are connected, the bonding area between the tape 100 and the seam of the first electrode tape 12a and the second electrode tape 12b is relatively small, thereby affecting the connection effect of the first electrode tape 12a and the second electrode tape 12b. Based on this, 1 / 7≤d / D≤1 / 4 is made. In this way, the occurrence of glue overflow can be avoided and the connection effect of the first electrode tape 12a and the second electrode tape 12b can be improved.

[0125] In some possible embodiments, see Figure 13 The four corners of the base film 110 are all provided with chamfers 113 .

[0126] The chamfer 113 may be a right angle or a rounded angle.

[0127] By providing chamfers 113 at all four corners of the base film 110 , the edge of the base film 110 can be aligned with the edges of the first and second electrode strips 12a and 12b , further improving the connection effect of the first and second electrode strips 12a and 12b .

[0128] See also Figure 14 The embodiment of the present application further provides a film roll 200, which includes the tape 100 in the above embodiment, and the tape 100 includes multiple tapes, and the multiple tapes 100 are sequentially connected and wound along the length direction of the tape 100.

[0129] Among them, the tape 100 in the embodiment of the present application can have the same structure as any of the tapes 100 in the above embodiments, and can bring the same or similar beneficial effects. For details, please refer to the description in the above embodiments, and the embodiment of the present application will not be repeated here.

[0130] Since the film roll 200 in this embodiment includes the tape 100 in the above embodiment, the use of the film roll 200 in this embodiment can improve the efficiency of splicing the first electrode strip 12a and the second electrode strip 12b.

[0131] See also Figure 15 and Figure 16 The present application also provides a method for splicing a pole piece. The method is used to splice the pole piece in the above embodiment. The tape 100 includes a first tape 100a, a second tape 100b, and a third tape 100c. The method includes:

[0132] S100 , aligning the first end of the first electrode strip and the second end of the second electrode strip.

[0133] S200 , attaching a first adhesive tape to surfaces of the first end portion and the second end portion along the width direction of the first electrode strip.

[0134] S300 , attaching the second adhesive tape to the surface of the first adhesive tape close to the first side edge of the first electrode tape in the width direction and the surfaces of the first electrode tape and the second electrode tape close to the first side edge along the length direction of the first electrode tape.

[0135] S400 , attaching the third adhesive tape to the surface of the first adhesive tape close to the second side edge of the first electrode tape in the width direction and the surfaces of the first electrode tape and the second electrode tape close to the second side edge along the length direction of the first electrode tape.

[0136] Because the second adhesive tape 100b is attached to the surface of the first adhesive tape 100a near the first side and the surfaces of the first and second electrode strips 12a, 12b near the first side, the bonding area between the adhesive tape 100 and the surface of the first electrode strip 12a near the first side and the surfaces of the adhesive tape 100 and the second electrode strip 12b near the first side can be increased, thereby improving the bonding strength of the portion of the adhesive tape 100 near the first side. Similarly, the third adhesive tape 100c is attached to the surface of the first adhesive tape 100a near the second side and the surfaces of the first and second electrode strips 12a, 12b near the second side, which can improve the bonding strength of the portion of the adhesive tape 100 near the third side.

[0137] Therefore, by attaching the second tape 100b to the surface of the first tape 100a close to the first side edge and the surfaces of the first electrode tape 12a and the second electrode tape 12b close to the first side edge, and by attaching the third tape 100c to the surface of the first tape 100a close to the second side edge and the surfaces of the first electrode tape 12a and the second electrode tape 12b close to the second side edge, the bonding strength of the tape 100 to the first electrode tape 12a and the second electrode tape 12b can be strengthened.

[0138] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A pole piece, characterized in that: include: A first pole piece strip, having a first end portion along a length direction of the first pole piece strip; A second pole piece strip, wherein the length direction of the second pole piece strip is the same as the length direction of the first pole piece strip, and the second pole piece strip has a second end along the length direction of the second pole piece strip; An adhesive tape is attached to surfaces of the first end portion and the second end portion, and the adhesive tape comprises: A base film, the base film comprising a coating area and a blank area, the blank area being arranged around the coating area; An adhesive layer is coated on at least a portion of the coating area, and the coating area is bonded to the surfaces of the first end portion and the second end portion respectively through the adhesive layer.

2. The pole piece according to claim 1, characterized in that: The adhesive layer is coated on the entire coating area.

3. The pole piece according to claim 1, characterized in that: The adhesive layer is coated on part of the coating area.

4. The pole piece according to claim 3, characterized in that: The portion of the coating area coated with the adhesive layer forms a coating portion, and the portion of the coating area not coated with the adhesive layer forms a spacing portion; There are multiple gluing parts, and the spacing part is arranged between two adjacent gluing parts.

5. The pole piece according to claim 4, characterized in that: The plurality of glue-coated portions are arranged at intervals along the length direction of the first pole piece strip.

6. The pole piece according to claim 5, characterized in that: The blank area includes a first blank area and a second blank area provided on both sides of the coating area along the length direction of the first electrode strip; Along the length direction of the first pole piece strip, the width of the spacer portion is equal to the width of the second blank area, and the width of the second blank area is greater than the width of the first blank area.

7. The pole piece according to claim 4, characterized in that: The plurality of glue-coated portions are arranged at intervals along the width direction of the first pole piece strip.

8. The pole piece according to claim 7, characterized in that: The blank area includes a first blank area and a second blank area provided on both sides of the coating area along the length direction of the first electrode strip, and the width of the second blank area is greater than that of the first blank area.

9. The pole piece according to claim 4, characterized in that: The plurality of glue-coated portions are arranged at intervals along a direction inclined relative to the length direction of the first pole piece strip.

10. The pole piece according to any one of claims 5 to 9, characterized in that: The gluing portion is in the shape of an elongated strip, and a width direction of the elongated strip is parallel to an arrangement direction of the plurality of gluing portions.

11. The pole piece according to any one of claims 5 to 9, characterized in that: The glue coating portion is wavy, and a width direction of the wavy shape is parallel to an arrangement direction of the plurality of glue coating portions.

12. The pole piece according to claim 4, characterized in that: The plurality of glue coating portions are distributed in the coating area in a dotted manner.

13. The pole piece according to claim 12, characterized in that: The glue coating portion is circular or polygonal.

14. The pole piece according to claim 1, characterized in that: The blank area includes a first blank area and a second blank area arranged on both sides of the coating area along the length direction of the first electrode strip, and a third blank area and a fourth blank area arranged on both sides of the coating area along the width direction of the first electrode strip. The widths of the first blank area and the second blank area are both greater than the widths of the third blank area and the fourth blank area.

15. The pole piece according to claim 1, characterized in that: The four corners of the base film are all provided with chamfers.

16. A method for connecting a pole piece, characterized in that: The tape splicing method is used to splice the electrode according to any one of claims 1 to 15, wherein the tape comprises a first tape, a second tape, and a third tape, and the tape splicing method comprises: aligning a first end of the first pole piece strip and a second end of the second pole piece strip; Attaching the first adhesive tape to the surfaces of the first end portion and the second end portion along the width direction of the first electrode strip; Attaching the second adhesive tape to the surface of the first adhesive tape close to the first side edge of the first electrode strip in the width direction and the surfaces of the first electrode strip and the second electrode strip close to the first side edge along the length direction of the first electrode strip; The third tape is attached to the surface of the first tape close to the second side of the first tape in the width direction and the surfaces of the first and second tapes close to the second side along the length direction of the first electrode tape.

Images