Adhesive tape for fixing laminated cells of lithium ion battery and lithium ion battery and material turnover box

Abstract

The utility model relates to battery preparation technical field especially relates to a kind of adhesive tape for fixing the laminated core of lithium ion battery and lithium ion battery and material turnover box.Adhesive tape includes adhesive paper and auxiliary paper, the adhesive paper has adhesive surface, the auxiliary paper covers adhesive surface, the adhesive paper has a shape with the center area of laminated core bottom surface matching and the plurality of side wing parts of the size predetermined extension outwards from the center area four around, and auxiliary paper exceeds adhesive paper at at least one local position, forms a tear pull part.

Description

Technical Field

[0001] This utility model relates to the field of lithium-ion battery manufacturing, and in particular to an adhesive for fixing stacked cells of lithium-ion batteries, as well as lithium-ion batteries and material turnover boxes. Background Technology

[0002] In the manufacturing process of lithium-ion batteries, especially in the production of stacked cells, adhesive is usually applied to the sides of the stacked cells to fix them in place and prevent them from falling apart or shifting during subsequent transportation and packaging processes.

[0003] Currently, the adhesive application methods used in the industry are mainly divided into two types: Manual adhesive application involves operators cutting tape to a predetermined length according to process requirements and then manually applying it to the corresponding sides of the stacked cells. This method has significant drawbacks: First, it has low production efficiency and relies heavily on the operator's skill level; second, it is difficult to guarantee the consistency of adhesive application quality, easily resulting in problems such as inconsistent tape lengths, asymmetrical allowances on both sides, improper application tightness, and inaccurate placement, directly affecting the appearance consistency of the batteries and production efficiency.

[0004] Automated adhesive application equipment, such as existing wafer stacking machines, typically includes an adhesive application mechanism that enables automatic cutting and application. However, this type of equipment suffers from a significant drawback: long changeover and setup times. When producing battery products of different sizes and specifications, it is necessary to redesign, replace, or adjust the adhesive application template and its associated clamping and cutting mechanisms for wafers of varying lengths and widths. This process not only reduces the overall utilization rate of the equipment and affects the production schedule, but also increases production costs and management complexity due to the customized templates.

[0005] In conclusion, whether relying on manual labor or existing automated equipment, current adhesive application methods cannot achieve rapid, flexible production switching and low-cost operation while ensuring high quality and consistency. Summary of the Invention

[0006] One of the objectives of this utility model is to provide an adhesive for fixing stacked lithium-ion battery cells, as well as lithium-ion batteries and material turnover boxes, which can take into account the consistency of adhesive quality, production efficiency and convenience of changeover.

[0007] In a first aspect, the present invention provides an adhesive for fixing stacked lithium-ion battery cells, comprising adhesive paper and auxiliary paper, wherein the adhesive paper has an adhesive surface, and the auxiliary paper covers the adhesive surface, characterized in that: The adhesive tape has a central region whose shape matches the bottom surface of the stacked battery cell and a plurality of side wings of predetermined size extending outward from the central region. The auxiliary paper extends beyond the adhesive paper at at least one local location, forming a tear-away portion.

[0008] Optionally, the auxiliary paper has a single-piece structure, and its area is larger than that of the adhesive paper.

[0009] Optionally, the auxiliary paper is composed of two or more pieces joined together, with a tear-off portion formed on the outer edge of each piece.

[0010] Optionally, the central region is rectangular, and at least one of the side wings extends from each edge of the rectangle.

[0011] Optionally, at least two side wings extend from each of the length edges of the rectangle, respectively adjacent to the end of the length edge where they are located; At least one side wing is provided on each of the width edges of the rectangle, located at the middle of the width end of the rectangle.

[0012] Optionally, a side wing is provided at the middle of each length edge of the rectangle.

[0013] Optionally, one side wing is provided at one wide portion of the width, and two side wing portions are provided at the other wide end.

[0014] Secondly, this utility model provides a lithium-ion battery, including stacked cells. An adhesive film, one of the aforementioned adhesives, is wrapped around the stacked battery cell. The central area of ​​the adhesive film is attached to the bottom surface of the stacked battery cell, and each of the side wings is bent from the central area and attached to the side surface of the stacked battery cell.

[0015] Optionally, at least the end portion of each of the side wings extends and adheres to the top surface of the laminated cell.

[0016] Optionally, the side wings located on opposite sides of the stacked battery cell, which are attached to the end portion of the top surface, are at least partially stacked on top of each other.

[0017] Thirdly, this utility model embodiment provides a material turnover box, comprising: A box having a bottom and side walls connected to the perimeter of the bottom, the side walls enclosing an accommodating space with a top opening; At least one vertically extending slot is provided on each of the side walls, and the top of the slot is an open structure.

[0018] Optionally, the bottom is rectangular. The sidewalls include a first sidewall and a second sidewall disposed opposite to each other, and a third sidewall and a fourth sidewall disposed opposite to each other.

[0019] As can be seen above, because the adhesive tape is pre-formed, when the battery model changes, there is no need to adjust or replace any complex cutting molds, fixtures, or robotic arm programs. Only the corresponding adhesive tape roll or sheet material needs to be switched, reducing changeover time from several hours to just a few minutes, minimizing downtime and lowering equipment investment costs. Furthermore, all dimensions of the adhesive tape are determined before the material arrives, eliminating problems such as inconsistent tape lengths and asymmetrical allowances on both sides caused by fluctuations in manual or equipment parameters, ensuring a highly consistent appearance and effect for each battery. In addition, the auxiliary paper design with a tear-off section allows operators or robotic arms to easily and quickly pick up and peel the tape on manual or semi-automatic production lines, reducing operational difficulty and increasing cycle time. Attached Figure Description

[0020] The accompanying drawings, which are provided to further illustrate the present invention and form part of this application, do not constitute an undue limitation of the present invention.

[0021] Figure 1 A schematic diagram of the structure of an adhesive tape for fixing stacked cells of a lithium-ion battery, provided in an embodiment of this utility model; Figure 2 This is a schematic diagram of the structure of the adhesive paper in the adhesive provided in the embodiment of this utility model; Figure 3 This is a schematic diagram of the structure of the auxiliary paper in the adhesive provided in the embodiment of this utility model; Figure 4 This is a schematic diagram of the cross-sectional structure of the colloid provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of the material turnover box provided in an embodiment of the present utility model; Figure 6 A schematic diagram showing the structure of the adhesive paper (with the auxiliary paper removed) in the adhesive provided in this embodiment of the present invention being attached to the bottom surface of the stacked sheets; Figure 7 This is a schematic diagram of the structure of an adhesive tape provided in an embodiment of the present invention, in which the side wings of the adhesive paper are bent and attached to the side of the stacked battery cell, and further bent and attached to the top surface of the stacked battery.

[0022] Explanation of reference numerals in the attached figures: 1: Central area; 2: Side wing; 3: Tear-out section; 4: Laminated cell; 5: Turnover box; 51: Bottom; 52: Card slot; 53: Side wall.

[0023] 6: Auxiliary paper; 7: Adhesive paper. Detailed Implementation

[0024] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. The illustrative embodiments and descriptions of the present invention are used to explain the present invention, but are not intended to limit the present invention.

[0025] Examples of embodiments of the present invention are shown in the accompanying drawings in a detailed description below, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.

[0026] The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention. In the description of the present invention, it should be understood that terms such as "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the drawings and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0028] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0029] This embodiment provides a pre-formed special adhesive and its application in lithium-ion batteries. By pre-designing the adhesive paper 7 into a specific shape (central area + multiple side wings) that perfectly matches the cell structure, and using auxiliary paper 6 with a tear-off part, a change from raw material cutting to precise positioning and pasting is achieved, solving the industry pain point of poor adhesive quality consistency.

[0030] See Figures 1-7 As shown.

[0031] An adhesive for fixing stacked lithium-ion battery cells 4 is composed of adhesive paper 7 with an adhesive layer on one side and auxiliary paper 6 that is in close contact with the adhesive layer. The adhesive side of the adhesive paper 7 (usually with an adhesive layer) is covered and protected by the auxiliary paper 6.

[0032] The adhesive tape 7 is pre-designed and cut into a specific shape, having a central region 1 whose shape strictly matches the bottom shape of the stacked battery cell 4 to be fixed. Multiple side wings 2 extend outward integrally from the central region 1. The length and width of these side wings 2 are pre-set according to the size of the corresponding stacked battery cell 4, rather than being determined on the production line.

[0033] The auxiliary paper 6 extends beyond the edge of the adhesive paper 7 it covers at at least one local location, thus forming a tear-off portion 3. The user or a robotic arm can easily peel the auxiliary paper 6 off the adhesive surface of the adhesive paper 7 by pinching this tear-off portion 3.

[0034] This embodiment also provides a lithium-ion battery using the adhesive tape 7 of this embodiment, wherein the stacked battery cell 4 is covered and fixed using the aforementioned adhesive tape. Specifically, the covering method is to attach the central region 1 of the adhesive tape 7 to the bottom surface of the stacked battery cell 4, and then bend each side wing 2 from the central region 1 of the adhesive tape 7 so that it is tightly attached to each side of the stacked battery cell 4.

[0035] As can be seen above, since the adhesive tape is pre-formed, when the battery model changes, there is no need to adjust or replace any complex cutting molds, fixtures, or robotic arm programs. Only the corresponding adhesive tape roll or sheet material needs to be switched, reducing changeover time from several hours to just a few minutes, minimizing downtime and lowering equipment investment costs. Furthermore, all dimensions of the adhesive tape 7 are determined before the material arrives, eliminating problems such as inconsistent tape lengths and asymmetrical allowances on both sides caused by fluctuations in manual or equipment parameters, ensuring a highly consistent adhesive appearance and effect for each battery. In addition, the auxiliary paper 6 design with a tear-off section 3 allows operators or robotic arms to easily and quickly pick up and peel the tape on manual or semi-automatic production lines, reducing operational difficulty and increasing cycle time.

[0036] As an illustration of this embodiment, the auxiliary paper 6 can be a single, integral sheet structure, with at least one edge extending beyond the edge of the adhesive paper 7 it is attached to (denoted as a local edge). The extended portion serves as the tear-off section 3. The monolithic structure is simple, easy to process and laminate, and has lower costs, making it suitable for most scenarios.

[0037] As an illustration of this embodiment, the auxiliary paper 6 can also be composed of two (or more) smaller pieces of adhesive paper 7 joined together to cover the entire adhesive surface of the adhesive paper 7. The edge of each small piece of auxiliary paper 6 can form an independent tear-off portion 3 that makes it easy to tear the auxiliary paper 6 and adhesive paper 7 apart. The multi-piece joining scheme is suitable for wrapping adhesive tape with complex shapes or large areas. It allows for peeling in sections and in stages, reducing the inconvenience of peeling off a large area of ​​auxiliary paper 6 at once or the risk of the adhesive paper 7 accidentally sticking together, and providing greater operational flexibility.

[0038] Referring to the illustration, as an example of fixing a square battery, the central area 1 of the adhesive tape 7 in this embodiment is rectangular, suitable for the stacked cells 4 of a square lithium-ion battery. At least one side wing 2 is provided on each edge of the rectangle (two long edges and two short edges). Preferably, two side wings 2 are provided on each long edge, adjacent to both ends of the long edge; one side wing 2 is provided on each short edge, located in the middle of the short edge. This distribution ensures the reliability and uniformity of the adhesive coating around the square stacked cells 4.

[0039] In fact, the shape of the central area of ​​the adhesive tape 7 is not limited to square. It can be designed to fit the shape of the bottom surface of the laminated battery cell 4, and the principle is the same as in this embodiment.

[0040] As an illustration of this embodiment, a side wing 2 is further added in the middle of each length edge, which makes the fixing points in the length edge direction more dense.

[0041] As an illustration of this embodiment, considering that the battery cell may have a tab at one end and a tab at the other, a side wing 2 is provided on one width edge of the adhesive tape 7, located in the middle of that width edge. During packaging, the side wing 2 covers the surface of the side between the two tabs. Two side wing portions 2 are provided on the other short side to cover the bottom end of the laminated battery cell 4 where the tab is not present.

[0042] As can be seen from the above, by reasonably arranging the side wings 2 at different edges, the bottom and sides of the stacked battery cell 4 are fully and uniformly wrapped, effectively preventing the stacked battery cell 4 from scattering or shifting in subsequent processes.

[0043] As an illustration of this embodiment, after the side wing 2 is attached to the side of the stacked cell 4, its end portion is further bent so that it extends and attaches to the top surface of the cell, thereby improving the reliability of the cell's fastening.

[0044] As an illustration of this embodiment, at least two opposing side wings 2 are further designed to be elongated, such that after the at least two opposing side wings 2 are bent from opposite sides of the battery cell to the top surface, the end portions of the two are at least partially stacked and connected to each other on the top surface.

[0045] The wrapping method in this embodiment, which extends to the top surface and overlaps, forms a nearly complete "U" or "O" shaped package, providing reliable binding and fixing force, making it particularly suitable for applications with high fixing requirements. Furthermore, the overlap on the top surface can be covered by subsequent processes (such as labels), resulting in a flatter and more regular overall appearance of the battery.

[0046] This embodiment also provides a material turnover box 5 for storing and transferring the aforementioned pre-formed adhesive tapes. By designing slots 52 on its side wall 53 that precisely match the side wings 2 of the adhesive tapes, the adhesive tapes are accurately positioned, reliably protected, and quickly retrieved within the box. At the same time, the box itself has a stacking function, forming an efficient material flow solution.

[0047] refer to Figure 1 As shown, the material turnover box 5 mainly includes a box body. This box body consists of a bottom 51 and side walls 53 surrounding the bottom 51, which together enclose a receiving space with an open top. One or more vertically extending slots 52 are provided on each side wall 53. The shape, size, and position of these slots 52 on the side wall 53 correspond one-to-one with the multiple side wings 2 of the adhesive to be stored. Each slot 52 is a slit that penetrates the side wall 53, and its top is an open structure. This design allows the side wings 2 of the adhesive to be easily inserted into the slots 52 from above, while the through structure facilitates cleaning and visual inspection.

[0048] As an illustration of this embodiment, when the adhesive is used for a square battery, the central region 1 of the adhesive is rectangular, and correspondingly, the bottom 51 of the casing is rectangular. The sidewalls 53 and the casing form a three-dimensional space with a top opening. The sidewalls 53 include a first sidewall 53 and a second sidewall 53 (corresponding to the long edge) arranged opposite to each other, and a third sidewall 53 and a fourth sidewall 53 (corresponding to the short side) arranged opposite to each other. The slots 52 on the first and second sidewalls 53 are used to accommodate the side wing portion 2 on the long edge of the adhesive; the slots 52 on the third and fourth sidewalls 53 are used to accommodate the side wing portion 2 on the short side.

[0049] In use, multiple pre-formed adhesive patches are stacked (i.e., neatly piled) into the receiving space. At this time, the central area 1 of each patch is stably stacked and supported on the bottom 51 of the housing, while all their side wings 2 protrude vertically from the corresponding slots 52 on the side walls 53, extending outside the housing. Removing or placing the patches is done through the top opening; the topmost patch can be easily removed or placed.

[0050] By using this turnover box 5, the slots 52 on each side wall 53 position and constrain the side wing 2 located within the slot 52, so that each piece of adhesive is automatically guided when placed in, ensuring complete alignment of the upper and lower layers. Operators or robotic arms can quickly and undisturbedly remove the top piece through the top opening, improving material handling efficiency and accuracy, and is particularly suitable for automated production cycles.

[0051] In addition, this design allows the central area 1 of the adhesive tape to bear the weight while the side wings 2 are suspended, effectively preventing the stacked adhesive tapes from bending, deforming, or sticking together due to pressure during storage and transportation, ensuring that each adhesive tape maintains its preset shape from the warehouse to the production line.

[0052] In application, this special material turnover box 5 is not just a container. Due to the unique card slot 52 layout on the turnover box 5, the model information of the adhesive inside is materialized. Users can know the contents of the box just by looking at the box, realizing visual management.

[0053] The process of fixing and wrapping the stacked cells 4 of lithium-ion batteries using the pre-formed adhesive of the present invention is as follows. This process is applicable to manual, semi-automatic and fully automatic production lines.

[0054] Step 1: Preparation and material selection.

[0055] Pre-cut adhesive tapes, tailored to specific battery models, are placed in a dedicated turnover box 5 or loaded onto an automatic feeding mechanism. An operator or robotic arm picks up an adhesive tape from the turnover box 5.

[0056] Step 2: Peel off the auxiliary paper 6.

[0057] The operator or robotic arm grips the tear-off portion 3 of the auxiliary paper 6 that extends beyond the edge of the adhesive paper 7, and applies force in a direction parallel to the plane of the adhesive paper 7 to peel the auxiliary paper 6 off the adhesive surface of the adhesive paper 7, either as a whole or in pieces.

[0058] Step 3: Positioning and fitting the bottom surface.

[0059] Align the adhesive strip with the center area 1 of the peeled auxiliary paper 6 precisely with the bottom surface of the stacked battery cell 4, and then press it down to firmly adhere the center area 1 to the bottom surface of the battery cell. At this point, all the side wings 2 will naturally stand outside the sides of the battery cell.

[0060] Step 4: Bend and fit the sides.

[0061] Each side wing 2 is bent inward at an angle of 90 degrees or greater to ensure it fits tightly against the corresponding side of the laminated cell 4. A scraper or roller can be used to smooth it out, ensuring no air bubbles or wrinkles, depending on the process requirements.

[0062] Step 5 (optional, not mandatory): Extend and fit the top surface.

[0063] For battery cells that require stronger fixing force or specific appearance requirements, the end portion of the side wing 2 can be further bent to extend and fit against the top surface of the battery cell.

[0064] Step 6 (optional, not mandatory): Top surface overlap.

[0065] Based on the fifth step, the side wings 2 from opposite sides of the battery cell, which are attached to the top surface, are arranged so that their ends are at least partially overlapped.

[0066] To more clearly demonstrate the beneficial effects of the present invention, the following comparative examples are provided: In contrast, the traditional manual adhesive application process involves operators using rolls of tape, manually measuring and cutting them, and then applying multiple strips to the side of the battery cell. The traditional method results in significant variations in the placement, length, and tightness of the adhesive, which can differ greatly from person to person. In contrast, the product of this invention exhibits excellent appearance consistency and a significantly improved yield rate. Changing product models using the traditional method requires retraining operators; changing product models using this invention only requires replacing the adhesive material, without any adjustments.

[0067] By adopting the technical solution of this embodiment, the process can be completed in one go by using pre-formed adhesive tape, which greatly improves efficiency.

[0068] The above embodiments do not constitute a limitation on the scope of protection of this technical solution. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the above embodiments should be included within the scope of protection of this technical solution.

Claims

1. An adhesive for fixing stacked lithium-ion battery cells, comprising adhesive paper and auxiliary paper, wherein the adhesive paper has an adhesive surface, and the auxiliary paper covers the adhesive surface, characterized in that: The adhesive tape has a central region whose shape matches the bottom surface of the stacked battery cell and a plurality of side wings of predetermined size extending outward from the central region. The auxiliary paper extends beyond the adhesive paper at at least one local location, forming a tear-away portion.

2. The adhesive for fixing stacked lithium-ion battery cells according to claim 1, characterized in that, The auxiliary paper has a single-piece structure, and its area is larger than that of the adhesive paper.

3. The adhesive for fixing stacked lithium-ion battery cells according to claim 1, characterized in that, The auxiliary paper is composed of two or more pieces joined together, with a tear-off portion formed on the outer edge of each piece.

4. The adhesive for fixing stacked lithium-ion battery cells according to claim 1, characterized in that, The central region is rectangular, and at least one of the side wings extends from each edge of the rectangle.

5. The adhesive for fixing stacked lithium-ion battery cells according to claim 4, characterized in that, At least two side wings extend from each of the length edges of the rectangle, respectively adjacent to the end of the length edge where they are located; At least one side wing is provided on each of the width edges of the rectangle, located at the middle of the width end of the rectangle.

6. The adhesive for fixing stacked lithium-ion battery cells according to claim 5, characterized in that, A side wing is also provided at the middle of each length edge of the rectangle.

7. The adhesive for fixing stacked lithium-ion battery cells according to claim 5, characterized in that, One side wing is provided at the widest part of the width, and two side wing portions are provided at the other end of the width.

8. A lithium-ion battery, comprising stacked cells, characterized in that, The laminated battery cell is covered with adhesive paper according to any one of claims 1 to 7, the central area of ​​the adhesive paper is attached to the bottom surface of the laminated battery cell, and each of the side wings is bent from the central area and attached to the side surface of the laminated battery cell.

9. The lithium-ion battery according to claim 8, characterized in that, At least the end portion of each of the side wings extends and adheres to the top surface of the laminated cell.

10. The lithium-ion battery according to claim 9, characterized in that, The side wings located on opposite sides of the stacked battery cell, which are attached to the end portion of the top surface, are at least partially stacked on top of each other.

11. A material turnover box, characterized in that, include: A box having a bottom and side walls connected to the perimeter of the bottom, the side walls enclosing an accommodating space with a top opening; At least one vertically extending slot is provided on each of the side walls, and the top of the slot is an open structure.

12. A material turnover box according to claim 11, characterized in that, The bottom is rectangular. The sidewalls include a first sidewall and a second sidewall disposed opposite to each other, and a third sidewall and a fourth sidewall disposed opposite to each other.

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