Battery cell tab protection glue

Abstract

The utility model relates to battery cell tab protection glue, and belongs to the field of power lithium batteries and energy storage lithium batteries. The protective glue comprises a base film, the base film comprises a glue coating area and a glue-free area, and the glue coating area is coated with a glue layer; the adhesive layer is adhered to the roll core, and the non-adhesive area is exposed on the outer side of the tab of the roll core. According to the utility model, the adhesive layer and the base film are arranged in different widths, and the thickness of the base film is not equal, so that under the uniformity of the whole battery cell tab protection adhesive, the protection adhesive is adhered to a roll cell and does not adhere to a roll cell tab, the protection adhesive is prevented from being bent to adhere to the roll cell tab, the negative short phenomenon caused by poor encapsulation of the battery cell can be avoided, and the service life of the battery cell is prolonged. The safety of the battery cell is improved.

Description

Technical Field

[0001] The utility model belongs to the field of power lithium batteries and energy storage lithium batteries, and particularly relates to a battery core tab protection glue. Background Art

[0002] The existing battery cell tab protective glue includes a base film and a glue layer evenly coated on the base film. The protective glue of the above structure is used to wrap the core, and then the wrapped core and the core tab are combined to form a battery cell. In the actual battery cell assembly process, it is found that due to the bending and sticking of the protective glue, the wrapped core and the core tab contact the core tab, which causes the core tab to stick, resulting in poor conductivity of the core tab, a negative short circuit, and reduced battery cell safety.

[0003] Therefore, it is necessary to provide a battery cell tab protective glue that will not cause bending or sticking of the core tab. Utility Model Content

[0004] In view of the above problems, the utility model provides a battery cell tab protective glue.

[0005] The purpose of the utility model is achieved through the following technical solutions:

[0006] A battery cell tab protection glue comprises a base film, wherein the base film comprises a glue-coated area and a glue-free area, and the glue-coated area is coated with a glue layer;

[0007] The adhesive layer is adhered to the winding core, and the adhesive-free area is exposed outside the winding core tab.

[0008] Furthermore, the thickness of the glue-coated area is smaller than the thickness of the glue-free area.

[0009] Furthermore, the thickness of the adhesive layer is ≤1 mm.

[0010] Furthermore, the width of the adhesive layer is smaller than the width of the base film.

[0011] Furthermore, the sum of the thickness of the glue layer and the thickness of the glue-coated area is equal to the thickness of the glue-free area.

[0012] Furthermore, the glue layer is a layer with uniform thickness, and the glue coating area is a layer with uniform thickness.

[0013] Furthermore, the glue layer is a layer with a gradually varying thickness, and the glue coating area is a layer with a gradually varying thickness.

[0014] Furthermore, the adhesive layer is made of polyacrylate pressure-sensitive adhesive, which shrinks after being soaked in electrolyte. After shrinkage, the adhesive coating width is reduced from t1 to t2, and the adhesive coating thickness is increased from n1 to n2, wherein t1-t2≥3mm, n1≤1mm, and n2≤2mm.

[0015] Beneficial effects of the utility model:

[0016] The utility model discloses a battery cell pole ear protective glue, which is configured with different widths of the glue layer and the base film and unevenly treats the thickness of the base film. Under the uniformity of the entire battery cell pole ear protective glue, the protective glue can be glued to the winding core but not to the winding core pole ear, so that the protective glue is prevented from being bent and sticking to the winding core pole ear, thereby avoiding the negative short phenomenon of the battery cell caused by poor glue coating and improving the safety of the battery cell.

[0017] Other features and advantages of the utility model will be described in the following description, and partly become apparent from the description, or understood by implementing the utility model. The purpose and other advantages of the utility model can be realized and obtained by the structures indicated in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 One of the structural schematic diagrams of a battery tab protection glue according to an embodiment of the utility model is shown;

[0020] Figure 2 One of the structural schematic diagrams of a battery cell tab protection glue according to an embodiment of the utility model is shown;

[0021] In the figure: 10, base film; 11, glue-coated area; 12, glue-free area; 20, glue layer. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] In the description of the present invention, it should be understood that terms such as "opening", "upper", "lower", "thickness", "top", "middle", "length", "inside", "all around" and the like indicating orientation or positional relationship are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0024] like Figure 1 As shown, a battery tab protection glue according to an embodiment of the utility model includes a base film 10, the base film 10 includes a glue-coated area 11 and a glue-free area 12, and the glue-coated area 11 is coated with a glue layer 20;

[0025] In the embodiment of the utility model, the adhesive layer 20 is adhered to the winding core, and the adhesive-free area 12 is exposed outside the winding core tab;

[0026] The setting of the glue-coated area 11 and the glue-free area 12 of the base film 10 can prevent the base film 10 from being bent and stuck, thereby avoiding the negative short phenomenon of the battery cell caused by poor glue coating, and improving the safety of the battery cell.

[0027] In an embodiment of the utility model, the thickness of the glue-coated area is smaller than the thickness of the glue-free area.

[0028] In an embodiment of the utility model, the sum of the thickness of the glue layer and the thickness of the glue-coated area is equal to the thickness of the glue-free area, thereby ensuring the uniformity of the overall thickness of the battery cell tab protection glue.

[0029] In the embodiment of the utility model, the thickness of the adhesive layer is ≤1 mm.

[0030] In the embodiment of the utility model, the base film is a polymer material resistant to electrolyte such as PE, PP, PET, PI, etc.

[0031] In an embodiment of the utility model, the adhesive layer is made of an adhesive raw material that can shrink after being soaked in an electrolyte, and the adhesive coating width is reduced and the adhesive coating thickness is increased after shrinkage. The adhesive layer shrinks after being soaked in an electrolyte, and the adhesive coating width is reduced from t1 to width t2 after shrinkage, and the adhesive coating thickness is increased from n1 to n2, wherein t1-t2≥3mm, n1≤1mm, n2≤2mm, t1≤Nmm, t2≤N-3mm.

[0032] In the embodiment of the utility model, the width of the adhesive layer is smaller than the width of the base film, and the width of the adhesive layer can be infinitely close to the width of the base film. The optimal width of the adhesive layer is that the adhesive layer does not leak out of the winding core.

[0033] In the embodiment of the utility model, the adhesive layer and the adhesive coating area are both thin layers with uniform thickness.

[0034] like Figure 2As shown, the battery cell tab protection glue comprises a base film 10, the base film 10 comprises a glue-coated area 11 and a glue-free area 12, and the glue-coated area 11 is coated with a glue layer 20;

[0035] In an embodiment of the utility model, the thickness of the glue-coated area is smaller than the thickness of the glue-free area.

[0036] In an embodiment of the utility model, the sum of the thickness of the adhesive layer and the thickness of the adhesive-coated area is equal to the thickness of the adhesive-free area, thereby ensuring that the overall thickness of the adhesive tape is uniform.

[0037] In the embodiment of the utility model, the thickness of the adhesive layer is ≤1 mm.

[0038] In the embodiment of the utility model, the base film is a polymer material resistant to electrolyte such as PE, PP, PET, PI, etc.

[0039] In the embodiment of the utility model, the width of the adhesive layer is smaller than the width of the base film, and the width of the adhesive layer can be infinitely close to the width of the base film. The optimal width of the adhesive layer is that the adhesive layer does not leak out of the winding core.

[0040] In the embodiment of the utility model, the adhesive layer and the adhesive coating area are both thin layers with gradually varying thickness.

[0041] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0042] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.

Claims

1. A battery cell tab protective glue, characterized in that: The base film comprises a glue-coated area and a glue-free area, and the glue-coated area is coated with a glue layer; The adhesive layer is adhered to the winding core, and the adhesive-free area is exposed outside the winding core tab.

2. The battery tab protective glue according to claim 1, characterized in that: The thickness of the glue-coated area is smaller than the thickness of the glue-free area.

3. The battery tab protective glue according to claim 1, characterized in that: The thickness of the adhesive layer is ≤1mm.

4. The battery tab protective glue according to claim 1, characterized in that: The width of the adhesive layer is smaller than the width of the base film.

5. The battery tab protection glue according to any one of claims 1 to 4, characterized in that: The sum of the thickness of the glue layer and the thickness of the glue-coated area is equal to the thickness of the glue-free area.

6. The battery tab protective glue according to claim 5, characterized in that: The glue layer is a layer with uniform thickness, and the glue coating area is a layer with uniform thickness.

7. The battery tab protective glue according to claim 5, characterized in that: The glue layer is a layer with a gradually changing thickness, and the glue coating area is a layer with a gradually changing thickness.

8. The battery tab protective glue according to claim 1, characterized in that: The adhesive layer is made of polyacrylate pressure-sensitive adhesive and shrinks after being soaked in electrolyte. After shrinking, the adhesive coating width is reduced from t1 to t2, and the adhesive coating thickness is increased from n1 to n2.

9. The battery tab protective glue according to claim 8, characterized in that: The gluing width: t1-t2≥3mm.

10. The battery tab protective glue according to claim 8, characterized in that: Before the electrolyte immersion, the coating n1 is ≤1mm, and after the electrolyte immersion, the coating n2 is ≤2mm.

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