Cylindrical battery and wrapping tape thereof
By using elastic member winding tape with deformation capability in cylindrical batteries, the problem that traditional tape cannot fix the core is solved, the stable fixation of the core and the release of the expansion space are achieved, and the service life of the battery is extended.
Patent Information
- Application Number
- CN202421228881.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-31
- Publication Date
- 2025-06-03
- Estimated Expiration
- 2034-05-31
AI Technical Summary
Traditional tape cannot effectively fix the core during the rolling of the cylindrical battery into the shell, resulting in up and down displacement of the core during use or vibration test, which in turn causes mechanical damage to the cover connectors that seal the core.
A winding belt including a body and an elastic member with deformation capability is adopted. One end of the elastic member is connected to the smooth layer, and the other end is used to abut against the inner wall of the shell, or one end of the elastic member is connected to the inner wall of the shell, and the other end is connected to the inner wall of the shell, thereby fixing the roll core and reducing the movement of the roll core in the shell.
Through the deformation ability of the elastic member, the core is fixed, the relative movement of the shell and the core is avoided, the space release required for core expansion is met, and the service life of the battery is extended.
Smart Images
Figure CN222940018U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of batteries, in particular to a cylindrical battery and its winding tape. Background Art
[0002] During the manufacturing process of a cylindrical battery, a winding device is used to wind the positive and negative electrodes and the separator together to form a core, and finally a tape is used to wrap the core once to prevent the core from spreading, so as to achieve the purpose of fixing the structure of the core itself. When the core is inserted into the shell of the cylindrical battery, in order to leave enough expansion space for the core in the later stage and reduce the difficulty of inserting the core into the shell, there will be a matching tolerance. The traditional tape is generally single-sided adhesive, and the side facing the shell is a smooth surface. Although this tape has strong adhesion and is corrosion-resistant and high-temperature resistant, the smooth surface has no tension and cannot fix the core after the core is inserted into the shell, resulting in vertical displacement during the later use or vibration test of the core, and further causing mechanical damage to the cover connection part that seals the core. Summary of the Utility Model
[0003] In view of the above problems, the utility model provides a cylindrical battery and its winding tape, which can fix the core when the elastic member contacts the shell or the smooth layer, reduce the movement of the core in the shell, and avoid the relative movement between the shell and the core.
[0004] The technical solution adopted by the utility model is as follows: a winding tape, comprising a body and an elastic member with deformation ability, one side of the body is an adhesive layer for pasting the core, the other side of the body is a smooth layer, one end of the elastic member is connected to the smooth layer, and the other end of the elastic member is used to abut against the inner wall of the shell, or one end of the elastic member abuts against the smooth layer, and the other end of the elastic member is used to connect with the inner wall of the shell.
[0005] Optionally, the number of the elastic members is multiple, and the multiple elastic members are distributed in a rectangular array on the outer surface of the smooth layer, or the multiple elastic members are distributed in a rectangular array on the inner wall of the shell.
[0006] Optionally, the material of the elastic member is fluororubber or silica gel.
[0007] Optionally, the length of the elastic member is 20 - 40 μm.
[0008] Optionally, the elastic member is adhered to the outer surface of the smooth layer or the inner wall of the shell by glue.
[0009] Optionally, both the adhesive layer and the glue are acrylate glue, and the thickness of the adhesive layer is 10 - 30 μm.
[0010] The present utility model also discloses a cylindrical battery, which comprises a wound core, a housing and the winding tape described above. The adhesive layer contacts the wound core. One end of the elastic member is connected to the smooth layer, and the other end of the elastic member abuts against the inner wall of the housing, or one end of the elastic member abuts against the smooth layer and the other end of the elastic member is connected to the inner wall of the housing.
[0011] Optionally, the material of the body is o-phenylphenol.
[0012] The beneficial effects of the present utility model are as follows: when the elastic member contacts the housing or the smooth layer, the wound core can be fixed, the movement of the wound core in the housing can be reduced, the relative movement between the housing and the wound core can be avoided, and in the later stage of cycling and storage, the volume of the wound core expands, and the elastic member is bent due to extrusion deformation, releasing more space to meet the expansion requirement of the wound core. Description of the Drawings
[0013] Figure 1 is a schematic structural view of the winding tape provided on the body according to an embodiment of the present utility model;
[0014] Figure 2 is a schematic view of the elastic member of the winding tape being bent under force according to an embodiment of the present utility model;
[0015] Figure 3 is Figure 1 a schematic view of the winding tape in
[0016] Figure 4 adhering to the outer peripheral wall of the wound core;
[0017] The reference signs in each drawing are: 1, body; 11, adhesive layer; 12, smooth layer; 2, elastic member; 3, wound core; 4, housing. Detailed Embodiments
[0018] The present utility model will be described in detail below with reference to the accompanying drawings.
[0019] As Figures 1 to 4 shown, this embodiment discloses a winding tape, which comprises a body 1 and an elastic member 2 with deformability. One side of the body 1 is an adhesive layer 11 for pasting the wound core 3, and the other side of the body 1 is a smooth layer 12. One end of the elastic member 2 is connected to the smooth layer 12, and the other end of the elastic member 2 is used to abut against the inner wall of the housing 4. When the elastic member 2 contacts the housing 4 or the smooth layer 12, the wound core 3 can be fixed, the movement of the wound core 3 in the housing 4 can be reduced, the relative movement between the housing 4 and the wound core 3 can be avoided. In the later stage of cycling and storage, the volume of the wound core 3 expands, and the elastic member 2 is bent due to extrusion deformation, releasing more space to meet the expansion requirement of the wound core 3. In other embodiments, one end of the elastic member 2 can abut against the smooth layer 12, and the other end of the elastic member 2 can be connected to the inner wall of the housing 4.
[0020] In this embodiment, as Figure 1 and 2 shown, the number of the elastic members 2 is plural, and the plural elastic members 2 are distributed in a rectangular array on the outer surface of the smooth layer 12. In other embodiments, the plural elastic members 2 are distributed in a rectangular array on the inner wall of the housing 4. The material of the elastic member 2 is fluororubber or silica gel. The length of the elastic member 2 is 20-40 μm. The specific height of the elastic member 2 can be designed according to the actual cyclic expansion requirements of the core. The elastic member 2 is adhered to the outer surface of the smooth layer 12 or the inner wall of the housing 4 by glue. The adhesive layer 11 and the glue are both acrylate glue, and the thickness of the adhesive layer 11 is 10-30 μm. The model of the adhesive layer 11 and the glue can be Loctite 3873 acrylic glue, which has good adhesiveness.
[0021] The present utility model also discloses a cylindrical battery, as Figure 4 shown, which comprises a core 3, a housing 4 and the winding tape described above. The adhesive layer 11 contacts the core 3. One end of the elastic member 2 is connected to the smooth layer 12, and the other end of the elastic member 2 abuts against the inner wall of the housing 4, or one end of the elastic member 2 abuts against the smooth layer 12, and the other end of the elastic member 2 is connected to the inner wall of the housing 4. The material of the body 1 is o-phenylphenol. The body 1 is not limited to using o-phenylphenol, and insulating materials such as polypropylene, polyester or polyimide can also be used.
[0022] The above are only the preferred embodiments of the present utility model, and thus do not limit the patent protection scope of the present utility model. Any equivalent structural transformation made by using the content of the specification and drawings of the present utility model, directly or indirectly applied in other related technical fields, shall be equally included in the protection scope of the present utility model.
Claims
1. A wrapping tape, characterized in that: It comprises a body and an elastic member with deformation ability, one side of the body is a glue layer for sticking the winding core, the other side of the body is a smooth layer, one end of the elastic member is connected to the smooth layer, and the other end of the elastic member is used to abut against the inner wall of the shell, or one end of the elastic member abuts against the smooth layer, and the other end of the elastic member is used to connect with the inner wall of the shell; There are multiple elastic members, and the multiple elastic members are distributed on the outer surface of the smooth layer in a rectangular array, or the multiple elastic members are distributed on the inner wall of the shell in a rectangular array.
2. The wrapping tape according to claim 1, characterized in that The elastic member is made of fluororubber or silicone.
3. The wrapping tape according to claim 1, characterized in that: The length of the elastic member is 20-40 μm.
4. The wrapping tape according to claim 1, characterized in that: The elastic member is adhered to the outer surface of the smooth layer or the inner wall of the shell by glue.
5. The wrapping tape according to claim 4, characterized in that: The adhesive layer and the glue are both acrylic glue, and the thickness of the adhesive layer is 10-30 μm.
6. A cylindrical battery, characterized in that: It comprises a winding core, a shell and the winding tape according to any one of claims 1 to 5, wherein the adhesive layer contacts the winding core, one end of the elastic member is connected to the smooth layer and the other end of the elastic member abuts against the inner wall of the shell, or one end of the elastic member abuts against the smooth layer and the other end of the elastic member is connected to the inner wall of the shell.
7. The cylindrical battery according to claim 6, characterized in that: The material of the main body is o-phenylphenol.