Adhesive tape for preventing battery cell tab from being broken and battery cell tab structure

Abstract

The utility model discloses a piece of gummed paper and a cell tab structure for preventing the fracture of a cell tab, the gummed paper comprises a binding surface close to a cell body and the tab and an outer surface far away from the cell body and the tab, the gummed paper consists of a plurality of gummed paper bodies, the plurality of gummed paper bodies are continuously arranged, the adjacent gummed paper bodies are connected end to end, the binding surface of each gummed paper body consists of a first sticky section, a second sticky section and a non-sticky section, the first sticky section is used for bonding the battery cell body, the second sticky section is used for bonding the tab, and the non-sticky section is used for bonding the battery cell body. And the non-viscous section is arranged between the first viscous section and the second viscous section. According to the utility model, the sticky and non-sticky combined gummed paper is adopted to bond the battery cell and the tab, so that the phenomenon that the traditional gummed paper is broken at the welding position is effectively solved. And due to the application of the non-sticky gummed paper, the gummed paper is not easily influenced by stretching or bending, so that the risk of breakage is reduced.

Description

Technical Field

[0001] The utility model relates to the field of batteries, and in particular to an adhesive tape for preventing a battery cell tab from breaking and a battery cell tab structure. Background Art

[0002] At present, with the development of the new energy industry, more and more lithium-ion batteries and sodium-ion batteries are being launched. In order to meet the high-rate performance requirements, multi-electrode structures are often used for design. The multi-electrode structure roll core is an efficient battery structure that increases the number of poles to improve the energy density and charge and discharge efficiency of the battery.

[0003] When producing battery rolls of this structure, the soft tabs are fixed by ultrasonic welding. However, the welding slag generated during the welding process may enter the interior of the battery and the soft tabs, causing internal short circuits or performance degradation of the battery. To solve this problem, glue is usually applied at the welding position after ultrasonic welding to prevent welding slag from entering the interior of the battery and to enhance the fixation of the tabs. However, during the pasting process, the outermost layer of adhesive tape often breaks due to stretching or bending. This breakage not only destroys the overall structural stability of the battery, but also increases the internal resistance of the battery cell, ultimately affecting the performance and life of the battery cell. Utility Model Content

[0004] The utility model aims to provide a kind of adhesive tape and battery cell tab structure for preventing the battery cell tab from breaking, which solves the above-mentioned problem.

[0005] To achieve the above purpose, the utility model provides the following technical solutions:

[0006] A tape for preventing a battery cell tab from breaking, the tape comprising a fitting surface close to the battery cell body and the tab, and an outer surface away from the battery cell body and the tab, the tape comprising a plurality of tape bodies, the plurality of tape bodies being arranged in succession and adjacent tape bodies being connected head to tail, the fitting surface of each tape body comprising a first adhesive segment, a second adhesive segment and a non-adhesive segment, the first adhesive segment being used for bonding the battery cell body, the second adhesive segment being used for bonding the tab, and the non-adhesive segment being arranged between the first adhesive segment and the second adhesive segment.

[0007] Preferably, the first adhesive section and the second adhesive section both include an adhesive layer capable of bonding the adhesive tape body to the battery cell body and the tab.

[0008] Preferably, the non-adhesive section comprises a first non-adhesive section and a second non-adhesive section.

[0009] Preferably, a first turning portion is provided between the first sticky section and the first non-sticky section, and a second turning portion is provided between the second sticky section and the first non-sticky section; the battery cell body includes a bottom wall and a side wall, the first turning portion corresponds to the turning point between the bottom wall and the side wall, and the second turning portion corresponds to the turning point between the bottom wall and the pole ear.

[0010] Preferably, the non-adhesive section is made of PET material, and the non-adhesive section corresponds to the bottom wall of the battery cell body.

[0011] The utility model also provides a battery cell tab structure, comprising the battery cell body and the tab, wherein the adhesive paper is used for covering the battery cell body and the tab.

[0012] The beneficial effect of the utility model is that the utility model uses adhesive and non-adhesive combined adhesive tape to bond the battery cell and the tab, effectively solving the problem of traditional adhesive tape breaking at the welding position. The application of non-adhesive adhesive tape makes the adhesive tape less susceptible to stretching or bending, thereby reducing the risk of breakage and improving the stability of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the adhesive tape of the utility model;

[0014] Figure 2 It is a schematic diagram of the use structure of the utility model;

[0015] Among them, there are adhesive tape 1, battery cell body 2, bottom wall 21, side wall 22, pole ear 3, fitting surface 4, outer surface 5, adhesive tape body 6, first sticky section 61, second sticky section 62, non-sticky section 63, first non-sticky section 631, second non-sticky section 632, first turning part 64, second turning part 65, pole ear welding point 7. DETAILED DESCRIPTION

[0016] The technical solution of the present application is further described in detail below in conjunction with specific implementation methods.

[0017] In the description of the present invention, it should be noted that the terms "top", "bottom", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0018] like Figure 1 to Figure 2As shown, the utility model provides a tape for preventing the tab of a battery cell from breaking. The tape 1 includes a fitting surface 4 close to the battery cell body 2 and the tab 3, and an outer surface 5 away from the battery cell body 2 and the tab 3. The battery cell body 2 includes a bottom wall 21 and a side wall 22. The tape 1 is composed of a plurality of tape bodies 6, and the plurality of tape bodies 6 are continuously arranged and two adjacent tape bodies 6 are connected head to tail. Among them, the fitting surface 4 of each tape body 6 is composed of a first adhesive section 61, a second adhesive section 62 and a non-adhesive section 63, and the first adhesive section 61 and the second adhesive section 62 are both provided with an adhesive layer (not shown). The first adhesive section 61 is bonded to the side wall of the battery cell body 2 through the adhesive layer, and the second adhesive section 62 is bonded to the tab 3 through the adhesive layer to protect it. The non-adhesive section 63 is arranged between the first adhesive section 61 and the second adhesive section 62 to cover the unwelded part of the bottom wall 21 of the battery cell body 2 to prevent the tab welding point 7 from breaking.

[0019] One embodiment of the utility model is: the non-adhesive section 63 includes a first non-adhesive section 631 and a second non-adhesive section 632. The first non-adhesive section 631 is arranged between the first adhesive section 61 and the second adhesive section 62, and the second non-adhesive section 632 is arranged between the second adhesive section 62 and the first adhesive section 61 of another adhesive tape body 1. A first turning portion 64 is arranged between the first adhesive section 63 and the first non-adhesive section 61; a second turning portion 65 is arranged between the second adhesive section 62 and the first non-adhesive section 61. The first turning portion 64 corresponds to the turning point between the bottom wall 21 and the side wall 22, and the second turning portion 65 corresponds to the turning point between the bottom wall 21 and the pole ear 3.

[0020] When in use, the first adhesive section 61 is bonded to the side wall 22 of the battery cell body 2, the first non-adhesive section 631 covers the bottom wall 21 of the battery cell body 2, and the second adhesive section 62 is bonded to the tab 3. When the tape body 6 is stretched or bent by force, since the first non-adhesive section 631 is not adhesive, the first non-adhesive section only covers the bottom wall 21 and will not be bonded to the bottom wall 21. The first non-adhesive section 631 will move slightly to prevent the connection between the first adhesive section 61 and the second adhesive section 62 at both ends of the first non-adhesive section 631 from breaking, thereby affecting the battery performance. Compared with the traditional adhesive tape 1 with adhesive tape on the bottom wall 21, the force on the first turning part 64 and the second turning part 65 of the utility model is relatively small, which reduces the occurrence of the breakage phenomenon. When bonding the battery cell body 2 and the tab 3, it can be cut at the second non-adhesive section 632 of each tape body 6, and bonded manually or by machine.

[0021] Another embodiment of the utility model is that the non-adhesive section 63 includes a first non-adhesive section 631, the first non-adhesive section 631 is arranged between the first adhesive section 61 and the second adhesive section 62, and the second adhesive section 62 is arranged as a longer section. When bonding the battery body 2 and the tab 3, the second adhesive section 62 of each tape body 6 can be cut in the middle, and bonded manually or by machine, one section of the second adhesive section 62 is attached to the tab 3, and the other section of the second adhesive section 62 is attached to the side wall 22 of the next battery body 2.

[0022] The non-adhesive section 63 of the present invention can be made of non-adhesive PET material or the like.

[0023] The utility model also discloses a battery cell tab structure, including a battery cell body 2 and a tab 3, wherein adhesive tape 1 is used to cover the battery cell body 2 and the tab 3 to prevent welding slag from entering the interior of the battery and to enhance the fixing effect of the tab 3, while also reducing the phenomenon of battery performance being affected by adhesive tape breakage.

[0024] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0025] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A tape for preventing a battery cell tab from breaking, the tape comprising a bonding surface close to the battery cell body and the tab, and an outer surface away from the battery cell body and the tab, characterized in that: The adhesive tape is composed of a plurality of adhesive tape bodies, which are continuously arranged and adjacent to each other at the head and tail ends. The bonding surface of each adhesive tape body is composed of a first adhesive section, a second adhesive section and a non-adhesive section. The first adhesive section is used to bond the battery cell body, the second adhesive section is used to bond the tab, and the non-adhesive section is arranged between the first adhesive section and the second adhesive section.

2. The adhesive tape for preventing the battery tab from breaking according to claim 1, characterized in that: The first adhesive section and the second adhesive section both include an adhesive layer capable of bonding the adhesive tape body to the battery cell body and the tab.

3. The adhesive tape for preventing the battery tab from breaking according to claim 1, characterized in that: The non-adhesive section includes a first non-adhesive section and a second non-adhesive section.

4. The adhesive tape for preventing the battery tab from breaking according to claim 3, characterized in that: A first turning portion is arranged between the first sticky section and the first non-sticky section, and a second turning portion is arranged between the second sticky section and the first non-sticky section; the battery cell body comprises a bottom wall and a side wall, the first turning portion corresponds to the turning point between the bottom wall and the side wall, and the second turning portion corresponds to the turning point between the bottom wall and the pole ear.

5. The adhesive tape for preventing the battery tab from breaking according to claim 1, characterized in that: The non-adhesive section is made of PET material, and the non-adhesive section corresponds to the bottom wall of the battery cell body.

6. A battery cell tab structure, characterized in that: It comprises a battery cell body, a tab and the adhesive tape as claimed in claim 4, wherein the adhesive tape is used to cover the battery cell body and the tab.

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