Method for affixing tab adhesive tape for cylindrical cell, and cylindrical cell and battery

Abstract

The present application belongs to the technical field of battery manufacturing. Disclosed is a method for affixing a tab adhesive tape for a cylindrical cell, the method comprising: S1, cutting an adhesive tape raw material to obtain an adhesive tape having a length equal to a set length, wherein the side edge of the adhesive tape in the direction of length is manufactured as a non-continuous vertical side edge; S2, affixing the adhesive tape around a cylindrical cell, and making part of the adhesive tape protrude from the cylindrical cell to form protruding portions, wherein the protruding portions are configured to cover tabs at two ends of the cylindrical cell; and S3, making the protruding portions of the adhesive tape adhere to the ends of the cell, so as to complete adhesive tape affixing for the cylindrical cell.

Description

Gluing method of cylindrical battery cell tab adhesive, cylindrical battery cell and battery

[0001] The present application claims priority to the Chinese patent application No. 202410789514.3, filed on June 18, 2024, to the Chinese Patent Office, the whole content of the above application being incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the field of lithium cylindrical battery cell gluing manufacturing technology, in particular to a gluing method of cylindrical battery cell tab adhesive, cylindrical battery cell and battery. BACKGROUND

[0003] In the production and manufacturing process of lithium cylindrical battery cell, how to prevent the battery cell from leaking and the aluminum shell from being corroded is an important issue. Normally, the negative pole of the battery cell is separated from the shell by an insulating layer, and the shell is at a high potential. When the negative tab is exposed and contacts the aluminum shell, a short circuit occurs between the negative pole and the aluminum shell. The aluminum shell will have a corrosion potential condition, and the potential of the aluminum shell will decrease significantly. At the same time, the aluminum shell contacts the lithium ions in the electrolyte, and the low-potential aluminum shell will react with the lithium ions. The electrons are transferred from the negative pole to the aluminum shell, and the lithium ions are embedded in the aluminum shell to form an aluminum-lithium alloy, which eventually leads to corrosion of the aluminum shell. In severe cases, there is even a risk of electrolyte leakage. SUMMARY

[0004] In order to avoid contact between the negative pole and the aluminum shell, a tab adhesive paper is attached around the cylindrical lithium cylindrical battery cell to separate the tab from the aluminum shell. In the production and manufacturing process, the battery cell is first subjected to a gluing process, and then the glued battery cell is inserted into the aluminum shell. During the insertion process, the gap between the aluminum shell and the battery cell is small, and the thickness of the glued and overlapped part of the adhesive paper is large. Therefore, the glued and overlapped part of the adhesive paper attached around the battery cell is easily wrinkled due to the excessive thickness, and the wrinkles of the adhesive paper will cause the tab to be exposed, which will further cause the tab to contact the aluminum shell, resulting in corrosion of the aluminum shell and other consequences.

[0005] In a first aspect, the present application provides a gluing method of cylindrical battery cell tab adhesive, comprising the following steps:

[0006] S1, cutting the adhesive paper raw material to obtain a rectangular adhesive paper with a length equal to a set length;

[0007] One end of the length direction of the adhesive paper is made into a non-continuous vertical side, so that the area of the adhesive paper is smaller than that of a rectangular paper with the same length and width;

[0008] S2, gluing the adhesive paper around the cylindrical battery cell, so that part of the adhesive paper protrudes from the battery cell to form a protruding part, and the protruding part is arranged to cover the tabs at both ends of the cylindrical battery cell;

[0009] S3, the protruding part of the adhesive paper is attached to the end of the battery cell, and the adhesive paper is attached to the cylindrical battery cell.

[0010] In a second aspect, the application further provides a cylindrical battery cell, comprising a battery cell and an adhesive paper, wherein the adhesive paper is attached to the end of the battery cell by the adhesive paper attaching method.

[0011] The adhesive paper is attached to the end of the battery cell by the adhesive paper attaching method.

[0012] In a third aspect, the application further provides a battery, comprising a shell and a cylindrical battery cell, wherein the cylindrical battery cell is sealed in the shell, and the cylindrical battery cell is the cylindrical battery cell described above. Advantages

[0013] The adhesive paper attaching method provided by the application reduces the overlapping area of the two ends of the adhesive paper in the length direction when the adhesive paper is attached to the cylindrical battery cell, and the area of the adhesive paper is smaller than that of a rectangle with the same length and width. Even if the adhesive paper is wrinkled when the cylindrical battery cell is inserted into the aluminum shell, the overlapping area of the adhesive paper is small, and the wrinkling is greatly reduced, thereby reducing the probability of the tab leaking. The adhesive paper is attached to the end of the cylindrical battery cell, so that the adhesive paper can cover the tab at the edge, thereby further reducing the probability of the tab leaking.

[0014] The cylindrical battery cell provided by the application is attached by the adhesive paper attaching method, so that the side edge of one end of the adhesive paper in the length direction is discontinuous and vertical, and the area of the adhesive paper is smaller than that of a rectangle with the same length and width. Even if the adhesive paper is wrinkled when the cylindrical battery cell is inserted into the aluminum shell, the overlapping area of the adhesive paper is small, and the wrinkling is greatly reduced, thereby reducing the probability of the tab leaking. The adhesive paper is attached to the end of the cylindrical battery cell, so that the adhesive paper can cover the tab at the edge, thereby further reducing the probability of the tab leaking. Therefore, the tab is well protected by the adhesive paper, and the tab is not easy to leak, which is safer. At the same time, the thickness of the adhesive is reduced, and the entire cylindrical battery cell is easy to be inserted into the shell in the subsequent process.

[0015] The battery provided by the application avoids the tab of the cylindrical battery cell from leaking and contacting the shell, thereby greatly improving the safety performance of the battery. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a flow chart of the method for pasting the tab adhesive of the cylindrical battery cell according to the present application.

[0017] Figure 2 is a structural diagram of the adhesive paper in the method for pasting the tab adhesive of the cylindrical battery cell according to the present application.

[0018] Figure 3 is a structural diagram of the cylindrical battery cell after pasting the tab adhesive in the method for pasting the tab adhesive of the cylindrical battery cell according to the present application.

[0019] Figure 4 is a structural diagram of the chuck and the cylindrical battery cell in the method for pasting the tab adhesive of the cylindrical battery cell according to the present application.

[0020] Figure 5 is a structural diagram of the adhesive paper in another embodiment of the method for pasting the tab adhesive of the cylindrical battery cell according to the present application.

[0021] Figure 6 is a structural diagram of the cylindrical battery cell after pasting the tab adhesive in another embodiment of the method for pasting the tab adhesive of the cylindrical battery cell according to the present application.

[0022] Figure 7 is a structural diagram of the adhesive paper in another embodiment of the method for pasting the tab adhesive of the cylindrical battery cell according to the present application.

[0023] Explanation of reference signs:

[0024] 1, cylindrical battery cell; 2, adhesive paper; 201, protruding part; 3, chuck claw; 4, disc body; 5, pressing block; 6, groove. Embodiment of the present application

[0025] In the description of the present application, unless explicitly defined and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0026] In the present application, unless explicitly defined and limited, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, and the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, and the horizontal height of the first feature is less than that of the second feature.

[0027] In the description of the present embodiment, the terms "upper", "lower", "left", "right", "front", "back" and the like orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, which is for the convenience of description and simplification of 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, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are used to distinguish in the description and have no special meaning.

[0028] Referring to FIG. 1, a method for pasting cylindrical battery tab glue is provided in the present application, comprising the following steps:

[0029] S1, cutting the glue paper raw material to obtain a rectangular glue paper 2 with a length equal to the set length;

[0030] The side edges of the glue paper 2 in the length direction are made into non-continuous vertical side edges, so that the area of the glue paper 2 is smaller than that of a rectangle with the same length and width;

[0031] S2, the glue paper 2 is wrapped around the cylindrical battery 1, so that part of the glue paper 2 protrudes from the cylindrical battery 1 to form a protruding part 201, and the protruding part 201 is arranged to cover the tabs at both ends of the cylindrical battery 1;

[0032] S3, the protruding part 201 of the glue paper 2 is pasted to the end of the cylindrical battery 1, and the pasting of the cylindrical battery 1 is completed.

[0033] Exemplarily, in step S1, tools such as cutters and scissors can be used to cut or trim the side edges of the glue paper 2 in the length direction which has been cut to a set length, or the side edges of the glue paper 2 can be cut or trimmed first, and then the glue paper 2 is cut from the whole roll of glue paper (i.e. the glue paper raw material) to form a glue paper segment with a length that meets the set length. The non-continuous vertical side edges of the glue paper 2 can be used as the starting end or the terminal end during wrapping around the cylindrical battery 1, and in the present embodiment, the terminal end is preferred.

[0034] By making the side edges of one end of the glue paper 2 in the length direction into non-continuous vertical side edges, the area of the glue paper 2 is smaller than that of a rectangle with the same length and width under the premise that the length of the glue paper 2 meets the set length, thereby reducing the overlapping area of the two end parts of the glue paper 2 when pasted together in the length direction. By such arrangement, even if the pasting and overlapping part of the glue paper 2 is pushed and wrinkled by the aluminum shell during the process of inserting the cylindrical battery 1 into the aluminum shell, the wrinkles caused by the pasting and overlapping of the glue paper 2 are greatly reduced due to the small overlapping area, i.e. the probability of tab leakage is reduced; by pasting the part of the glue paper 2 protruding from the cylindrical battery 1 to the end of the cylindrical battery 1, the glue paper 2 can cover the tabs at the edge part, further reducing the probability of tab leakage.

[0035] In this embodiment, referring to FIG. 2, the side edges of the adhesive paper 2 in the length direction can be cut into bevels, so that one end of the adhesive paper 2 in the length direction forms a shape of a right triangle. Obviously, referring to the dashed part in FIG. 2, the area of the right triangle is smaller than that of a rectangle with the same length and width (i.e., the height of the right triangle).

[0036] The inclination angle α of the bevel is 10°-80°. If the inclination angle is too small, the adhesive paper 2 cannot be firmly pasted on the cylindrical battery cell 1 because the overlapping area of the two ends of the adhesive paper 2 in the length direction is too small. If the inclination angle is too large, the overlapping area of the two ends of the adhesive paper 2 in the length direction is still large, which cannot achieve the purpose of reducing the thickness of the pasted and overlapped part of the adhesive paper 2. The preferred inclination angle is 30°. Referring to FIG. 3, which shows the state of the two ends of the adhesive paper 2 being overlapped and pasted in this embodiment, part A in FIG. 3 is the part where the two ends of the adhesive paper 2 are overlapped and pasted. At this angle, the purpose of firmly pasting the adhesive paper 2 and reducing the area of the pasted and overlapped part of the adhesive paper 2 can be better achieved.

[0037] In this embodiment, S3 specifically comprises:

[0038] S301, gathering the protruding part 201 to one side of the end of the cylindrical battery cell 1;

[0039] S302, flattening the protruding part 201 so that the protruding part 201 is pasted to the end of the cylindrical battery cell 1, thereby completing the pasting of the adhesive paper 2 on the cylindrical battery cell 1.

[0040] Half of the adhesive paper 2 in the width direction is adhesive and is pasted on the top of the cylindrical battery cell 1. The other half of the adhesive paper 2 in the width direction protrudes from the axial end surface of the cylindrical battery cell 1 so that the adhesive paper 2 can cover the tab. This part is the protruding part 201. Further, the protruding part 201 of the adhesive paper 2 is flattened so that the adhesive paper 2 tightly adheres to the axial end surface of the cylindrical battery cell 1, thereby achieving the effect of covering the tab.

[0041] For example, referring to FIG. 4, S301 specifically comprises gathering the protruding part 201 of the adhesive paper 2 to the axial direction of one side of the end of the cylindrical battery cell 1, i.e., gathering the part of the adhesive paper 2 protruding from the cylindrical battery cell 1 to the axial direction of the cylindrical battery cell 1. In this way, when the adhesive paper 2 is flattened, the adhesive paper 2 can uniformly circumferentially cover the end surface of the cylindrical battery cell 1, thereby ensuring that the tab can be covered by the adhesive paper 2 of sufficient length.

[0042] In order to achieve the effect of S3, manual operation, mechanical hand operation, etc. can be used. In this embodiment, a chuck is used. The chuck can be a three-jaw chuck, a four-jaw chuck, a six-jaw chuck, etc. In this embodiment, a four-jaw chuck is used. Referring to FIG. 4, the chuck comprises chuck jaws 3 and a disc body 4. The disc body 4 is provided with a cylindrical pressing block 5 along the axis. The four chuck jaws 3 move radially with the pressing block 5 as the center. For example, S3 specifically comprises:

[0043] S301, the chuck is placed coaxially with the cylindrical battery cell 1, and then the chuck jaws 3 are opened, so that the chuck jaws 3 surround the protruding part 201 of the rubber paper 2, and at the same time the chuck moves towards the cylindrical battery cell 1, so that the pressing block 5 moves into the surrounding of the rubber paper 2; the chuck jaws 3 are closed, and the protruding part 201 of the rubber paper 2 is clamped by the chuck jaws 3, so that the protruding part 201 tightly abuts the circumferential wall of the pressing block 5; since the pressing block 5 is coaxial with the chuck, and the chuck is coaxial with the cylindrical battery cell 1, at this time the protruding part 201 of the rubber paper 2 is gathered in the axial direction of the end face of the cylindrical battery cell 1;

[0044] S302, the chuck moves towards the cylindrical battery cell 1, so that the protruding part 201 of the rubber paper 2 gathered on one side of the end of the cylindrical battery cell 1 is pressed on the pressing block 5 of the chuck, and the gathered protruding part 201 is attached to the end of the cylindrical battery cell 1, thereby completing the rubber coating of the cylindrical battery cell 1.

[0045] In this embodiment, it also includes:

[0046] S4, CCD full inspection is performed on the rubber-coated cylindrical battery cell 1. For example, for the cylindrical battery cell 1 that has completed the rubber coating operation, a CCD device is used to detect the end face of the rubber coating, so as to avoid the unqualified cylindrical battery cell 1 from flowing into the next process.

[0047] In another embodiment, the side edge of the rubber paper 2 in the length direction can also be cut into a side edge with a groove 6.

[0048] For example, referring to FIG. 5, the groove 6 of the side edge of the rubber paper 2 in the length direction is square-shaped, so that one end of the rubber paper 2 in the length direction forms a “” character shape, and thus the area of one end of the rubber paper 2 in the length direction is obviously smaller than that of a rectangle (the dashed part in FIG. 3) of the same length and width. Referring to FIG. 6, which shows the state of the rubber paper 2 when the two ends of the rubber paper 2 are overlapped and attached, part B in FIG. 6 is the part where the two ends of the rubber paper are overlapped, the end of the rubber paper 2 that is not cut is tightly attached to the side edge of the groove 6, and the end of the rubber paper 2 that is cut out of the groove 6 is attached to the rubber paper 2 on the upper and lower sides of the groove 6, thereby greatly reducing the overlapping area of the overlapped part of the two ends of the rubber paper 2.

[0049] In another embodiment, the side edge of the rubber paper 2 in the length direction is made into a side edge with a triangular groove 6.

[0050] Exemplarily, referring to FIG. 7, the side edge of the adhesive tape 2 in the length direction can also be cut into a triangular recess 6, which has similar effect to the square recess 6, but compared with the square recess 6, although the overlapping area of the adhesive tape 2 with the triangular recess 6 is larger than that of the adhesive tape 2 with the square recess 6 when overlapping, the width of the adhesive tape 2 on the upper and lower sides of the triangular recess 6 is larger than that of the adhesive tape 2 on the upper and lower sides of the square recess 6, so that the adhesion strength of the adhesive tape 2 with the triangular recess 6 is larger than that of the adhesive tape 2 with the square recess 6.

[0051] The embodiment of the present application also provides a cylindrical battery cell, which comprises a battery cell and the adhesive tape 2, and the adhesive tape 2 is adhered to the end of the battery cell by using the adhesive tape adhering method for the cylindrical battery cell tab.

[0052] The cylindrical battery cell is adhered by using the adhesive tape adhering method, so that the side edge of one end of the adhesive tape 2 in the length direction is made into a discontinuous vertical side edge, and under the premise that the length of the adhesive tape 2 meets the set length, the area of the adhesive tape 2 is smaller than that of a rectangle with the same length and width, so as to reduce the overlapping area of the two ends of the adhesive tape 2 in the length direction when overlapping and adhering, so that even if the overlapping and adhering part of the adhesive tape 2 is pushed and wrinkled by the aluminum shell during the process of inserting the cylindrical battery cell 1 into the aluminum shell, the wrinkles are greatly reduced due to the small overlapping area of the overlapping and adhering of the adhesive tape 2, that is, the probability of tab leakage is reduced. In addition, by adhering the part of the adhesive tape 2 protruding from the cylindrical battery cell 1 to the end of the cylindrical battery cell 1, the adhesive tape 2 can cover the tab at the edge part, further reducing the probability of tab leakage. Therefore, the tab is well protected by the adhesive tape 2, and the tab is not easy to leak, which is safer, and at the same time, the thickness of the adhesive tape 2 is reduced, which makes the entire cylindrical battery cell easy to be inserted into the shell in the subsequent process.

[0053] The embodiment of the present application also provides a battery, which comprises a shell and a cylindrical battery cell, and the cylindrical battery cell is sealed in the shell, and the cylindrical battery cell is the cylindrical battery cell.

[0054] Since the cylindrical battery cell in the battery is adhered by using the aforementioned adhesive tape adhering method, the tab of the cylindrical battery cell is prevented from leaking out and contacting the shell, which greatly improves the safety performance of the battery.

Claims

1. A method for pasting cylindrical battery cell tab adhesive, comprising the following steps: S1, cutting the adhesive paper raw material to obtain a rectangular adhesive paper with a length equal to the set length; one end of the length direction of the adhesive paper is made into a non-continuous vertical side edge, so that the area of the adhesive paper is smaller than that of a rectangular with the same length and width; S2, the adhesive paper is pasted around the cylindrical battery cell, so that part of the adhesive paper protrudes from the cylindrical battery cell to form a protruding part, and the protruding part is arranged to cover the tabs at both ends of the cylindrical battery cell; S3, the protruding part of the adhesive paper is pasted to the end of the battery cell, and the pasting of the cylindrical battery cell is completed.

2. The method of claim 1, wherein, In S1, the side edge of the length direction of the adhesive paper is made into an inclined side edge.

3. The method of claim 2, wherein, The inclination angle of the inclined side edge of the adhesive paper is 10°-80°.

4. The method of claim 1, wherein, In S2, one half of the width direction of the adhesive paper is pasted around the top of the cylindrical battery cell, so that the other half of the width direction of the adhesive paper protrudes from the axial end surface of the cylindrical battery cell to form the protruding part.

5. The method of claim 1, wherein, In S1, the side edge of the length direction of the adhesive paper is made into a side edge with a groove.

6. The method of claim 5, wherein, The side edge of the length direction of the adhesive paper is made into a side edge with a square groove or a triangular groove.

7. The method of claim 5, wherein, The side edge of the length direction of the adhesive paper is cut to form the groove, and one end of the adhesive paper which is not cut is pasted to the side edge of the groove.

8. The method of claim 1 to 7, wherein, S3 includes: S301, gathering the protruding part to one side of the end of the cylindrical battery cell; S302, flattening the protruding part to make the protruding part fit the end of the cylindrical battery cell, and completing the pasting of the cylindrical battery cell.

9. The method of claim 8, wherein, In S301, the protruding part is gathered towards the axial direction of the cylindrical battery cell.

10. The method of claim 8, wherein, S3 includes: S301, providing a chuck, opening the chuck claws of the chuck to surround the protruding part of the adhesive paper; closing the chuck claws, the chuck claws clamping the protruding part, so that the protruding part is gathered to one side of the end of the cylindrical battery cell; S302, moving the chuck towards the cylindrical battery cell, pressing the protruding part gathered to one side of the end of the cylindrical battery cell on the pressing block of the chuck, making the gathered protruding part fit the end of the cylindrical battery cell, and completing the pasting of the cylindrical battery cell.

11. The method of claim 10, wherein, The chuck includes chuck claws and a disc body, and the disc body is provided with a cylindrical pressing block along its axis; S301 includes: S3011, providing the chuck, and placing the chuck coaxially with the cylindrical battery cell; S3012, opening the chuck claws to surround the protruding part of the adhesive paper, and moving the chuck towards the cylindrical battery cell at the same time, so that the pressing block moves into the surrounding of the adhesive paper; S3013, closing the chuck claws, the chuck claws clamping the protruding part, the protruding part closely adhering to the circumferential side wall of the pressing block, so that the protruding part is gathered in the axial direction of one side of the end surface of the cylindrical battery cell.

12. The method of claim 1 to 7, wherein, In S2, one end of the adhesive paper with non-continuous vertical side edges is pasted around the cylindrical battery cell as a starting end, or one end of the adhesive paper with non-continuous vertical side edges is pasted around the cylindrical battery cell as an ending end.

13. The method for applying adhesive to the tabs of a cylindrical battery cell according to any one of claims 1 to 7, further comprising: S4. Perform a full CCD inspection on the cylindrical battery cell after the adhesive has been applied.

14. A cylindrical battery cell, comprising a battery cell and adhesive tape, wherein the adhesive tape is adhered to the end of the battery cell using the adhesive application method for cylindrical battery cell tabs as described in any one of claims 1 to 13.

15. A battery comprising a housing and a cylindrical cell, the cylindrical cell being sealed within the housing, the cylindrical cell being the cylindrical cell as described in claim 14.

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