All-tab cylindrical battery roll core insulation structure

Abstract

The utility model discloses a full-tab cylindrical battery roll core insulation structure which comprises a roll core, an insulating gummed paper is attached and wound on the outer side of the roll core, gluing area gummed paper is arranged on the two sides of the insulating gummed paper close to the end portion of the roll core, and non-gluing area gummed paper is arranged on the two sides of the insulating gummed paper respectively protruding out of the end face of the roll core. The non-gluing area gummed paper is perpendicular to the roll core; the non-gluing area gummed paper is arranged on the end face of the roll core, the folding mark groove is formed between the non-gluing area gummed paper and the gluing area gummed paper, structural support and deformation guide are provided, and after external force disappears, the roll core is fixed to the roll core, and the roll core is fixed to the roll core through the folding mark groove. The stress distribution of the gummed paper is optimized by means of the crease grooves, the gummed paper in the non-gluing area can be quickly and accurately recovered to the initial position perpendicular to the roll core, it is ensured that the protruding length is stable, the effective insulation distance is maintained for a long time, and the insulation performance of the roll core is ensured.

Description

Technical Field

[0001] This utility model relates to the field of core insulation technology, specifically to the insulation structure of a cylindrical battery core with multiple tabs. Background Technology

[0002] In existing cylindrical batteries with multiple tabs, the insulating tape used for core-to-casing insulation is a fully coated adhesive method, meaning the adhesive covers the entire surface of the tape. However, since applying the adhesive tape is the initial step in the cell assembly process, during subsequent processing at different stations, the portion of the tape protruding from the core end face is prone to defects such as sticking to the end face, being pasted parallel to itself, or being folded downwards. This can cause the designed protrusion length of the tape to fail to meet process requirements, resulting in a loss or reduction in the tape's insulation function. Furthermore, this fully coated adhesive tape also suffers from drawbacks such as high rework rates during manufacturing, waste of materials and labor costs, increased inspection costs, and difficulty in detecting insulation problems after core assembly. Utility Model Content

[0003] Therefore, this utility model provides an insulation structure for a cylindrical battery core with all tabs to overcome the problems of the prior art.

[0004] This utility model is implemented by the following technical solution:

[0005] An insulation structure for a cylindrical battery core with multiple tabs includes a core. Insulating tape is wrapped around the outside of the core. Adhesive-coated areas are provided on both sides of the insulating tape near the ends of the core. Non-adhesive-coated areas are provided on both sides of the insulating tape protruding from the end face of the core. The non-adhesive-coated areas are perpendicular to the core. A crease groove is provided between the non-adhesive-coated areas and the adhesive-coated areas, and the crease groove is fixed to the insulating tape.

[0006] Preferably, the depth of the crease groove is 1 / 3 to 1 / 2 of the thickness of the insulating adhesive paper.

[0007] Preferably, the length of the adhesive tape in the non-adhesive area is 2.5-4 mm.

[0008] Preferably, the adhesive tape in the coating area is coated using a gap zebra pattern.

[0009] The advantages of this utility model are: by setting non-coated adhesive paper on the end face of the core and setting a crease groove between the non-coated and coated adhesive paper, structural support and deformation guidance are provided. After the external force disappears, the stress distribution of the adhesive paper is optimized by the crease groove, and the non-coated adhesive paper can quickly and accurately return to the initial position perpendicular to the core, ensuring the stability of the protrusion length, maintaining the effective insulation gap for a long time, and ensuring the insulation of the core. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 This is a schematic diagram of the structure described in this utility model;

[0012] Figure 2 This is a partial cross-sectional view of the structure described in this utility model;

[0013] Figure 3 This is a schematic diagram of the unfolded structure described in this utility model.

[0014] In the diagram: 1. Core, 2. Insulating tape, 3. Adhesive tape in the coated area, 4. Adhesive tape in the non-coated area, 5. Crease groove. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] like Figure 1 , Figure 2 , Figure 3 As shown, the insulation structure of the cylindrical battery core with all tabs includes a core 1. The core 1 undergoes surface cleaning treatment to ensure that there are no impurities, oil stains, etc. on the surface of the core 1, so as to ensure that the insulating tape 2 can be tightly attached to the core 1.

[0017] An automated winding device is used to attach and wrap the prepared insulating tape 2 to the outside of the core 1. During the winding process, the adhesive tape 3 in the coated area is tightly attached to the end of the core 1, while the non-adhesive tape 4 is perpendicular to the axis of the core 1 and protrudes evenly from the end face of the core 1. Through the precise control of the device, the tension of the insulating tape 2 is ensured to be uniform, avoiding wrinkles or loosening, and ensuring the stability of the entire insulation structure.

[0018] Near the edges on both sides of the insulating tape 2, adhesive tape 3 is set up using a specific adhesive coating process. The adhesive coating area adopts a gap zebra-style adhesive coating method to ensure the uniformity and stability of the adhesive coating.

[0019] Crease groove 5 is processed between adhesive tape 3 in the glued area and adhesive tape 4 in the non-glued area. The depth of crease groove 5 is strictly controlled within 1 / 3 to 1 / 2 of the thickness of insulating tape 2. During the creasing process, through precise pressure control and mold design, it is ensured that the depth of crease groove 5 is uniform and consistent, and will not damage the overall structure and insulation performance of insulating tape 2.

[0020] The portions of the insulating tape 2 that protrude from the end face of the core 1 are designated as the non-adhesive area tape 4, with a length controlled between 2.5-4mm. During the production process, the accuracy and consistency of the length of the non-adhesive area tape 4 are ensured by controlling the cutting and processing technology of the insulating tape 2.

[0021] Actual work process:

[0022] During the operation of a full-tab cylindrical battery, current is generated inside the battery. As the core component of the battery, the core 1 needs good insulation performance between itself and the battery casing to prevent faults such as short circuits. The adhesive area of ​​the insulating tape 2, tape 3, is tightly attached to the end of the core 1, while the non-adhesive area, tape 4, is set perpendicular to the core 1 and protrudes from the end face of the core 1, isolating the core 1 from the battery casing and further enhancing the insulation effect.

[0023] Since the non-adhesive area of ​​the adhesive tape 4 does not contain adhesive, problems such as poor bonding caused by adhesive stickiness during processing are avoided. This ensures that it always maintains an effective insulation distance between the core 1 and the shell, thereby effectively preventing current from being conducted from the core 1 to the shell and ensuring the normal operation and safety of the battery.

[0024] The crease groove 5 is set between the non-adhesive area adhesive paper 4 and the adhesive area adhesive paper 3, which can enhance the positional stability of the non-adhesive area adhesive paper 4.

[0025] When the non-coated adhesive tape 4 is squeezed, the crease groove 5, as a stress concentration area, can guide the deformation direction of the tape and make it bend in a predetermined way. Once the external force is removed, the crease groove 5 changes the local mechanical properties of the tape, so that the non-coated adhesive tape 4 can quickly and accurately spring back to the initial position perpendicular to the core 1 due to its own elastic stress. This ensures that the non-coated adhesive tape 4 maintains a stable position and shape throughout the entire processing process, and will not change the length of the protrusion from the end face of the core 1 due to the creases being pasted together. This reliably ensures that the insulation performance of the core 1 is not affected, and improves the yield and product quality in the battery production process.

[0026] The adhesive tape 3 in the coating area adopts an intermittent zebra-style coating method, which has significant advantages over the traditional full coating method. In terms of adhesive consumption, the intermittent coating method reduces the amount of adhesive used, thereby reducing production costs.

[0027] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An insulation structure for a cylindrical battery core with multiple tabs, comprising a core (1), characterized in that, The outer side of the core (1) is wrapped with insulating tape (2). On both sides of the insulating tape (2) near the end of the core (1), there are adhesive-coated tape (3). On both sides of the insulating tape (2), there are non-adhesive-coated tape (4) protruding from the end face of the core (1). The non-adhesive-coated tape (4) is perpendicular to the core (1). A crease groove (5) is provided between the non-adhesive-coated tape (4) and the adhesive-coated tape (3). The crease groove (5) is fixed on the insulating tape (2).

2. The insulation structure of the full-tab cylindrical battery core according to claim 1, characterized in that, The depth of the crease groove (5) is 1 / 3 to 1 / 2 of the thickness of the insulating adhesive paper (2).

3. The insulation structure of the full-tab cylindrical battery core according to claim 1, characterized in that, The length of the non-coated adhesive tape (4) is 2.5-4 mm.

4. The insulation structure of the full-tab cylindrical battery core according to claim 1, characterized in that, The adhesive tape (3) in the coating area is coated with a zebra-style intermittent adhesive.

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