Tab interval protection adhesive tape structure
By designing the electrode spacer protection tape structure, the problem of metal powder falling during the cutting process of lithium batteries is solved, and the internal resistance of the battery is stable and consistent.
Patent Information
- Application Number
- CN202422032227.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-21
- Publication Date
- 2025-08-29
- Estimated Expiration
- 2034-08-21
AI Technical Summary
The metal powder produced by lithium batteries during cutting is easily dropped into the electrode group and battery cell, resulting in micro short circuits, self-discharge and poor consistency of the battery cell. Traditional electrode tape is easily affected by electrolyte and falls off and increases internal resistance, affecting battery consistency.
An extreme ear spacer protection tape structure is designed, including a non-silicon release layer, a substrate layer, a spacer layer and a transparent adhesive layer. The final welding joints and diaphragm stacking layers are protected by adhesion of different adhesive layers to prevent metal powder from falling off and tape from falling off.
Effectively prevent metal powder from entering the electrode group and battery cell, maintain the internal resistance of the battery cell, improve battery consistency, and prevent the increase in internal resistance caused by the automatic peeling of the tape.
Smart Images
Figure CN223285248U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of adhesive tapes, in particular to a tab spacing protection adhesive tape structure. Background Art
[0002] Lithium batteries are widely used because of their advantages such as high operating voltage, high energy density, long cycle life, fast charging and discharging, safety and reliability. With the development of new energy, the use of lithium batteries in various industries is also increasing rapidly.
[0003] The lithium battery assembly process includes the following steps: first, the coated positive and negative electrodes are wound into a positive electrode sheet, separator, negative electrode sheet, and separator formation. The positive and negative electrodes are then pre-welded, cut, and finally welded to the tab sheet. The cutting process easily generates metal powder. Due to the large gaps between separators during the winding process, metal powder can easily fall into the electrode assembly and battery, causing micro-short circuits within the battery cell due to the metal dust. This can lead to excessive self-discharge of the lithium battery and poor consistency between batteries.
[0004] In order to prevent metal powder from falling into the unit and battery cells and to protect the final welding points, a layer of brown tab tape is generally pasted on the final welding points. However, the diaphragm stacking layer is not protected after pasting, so the battery cells are still at risk of being contaminated by metal powder. In addition, the traditional brown tab tape is easily affected by the electrolyte and automatically falls off, resulting in a sharp increase in the internal resistance of the battery cells and an increase in the consistency differences between the battery cells. Utility Model Content
[0005] The purpose of the utility model is to provide a tab spacing protection tape structure, which has a lighter unwinding force. When in use, the spacing adhesive layer at one end is adhered to the final welding point of the positive / negative electrode sheet and the Tab sheet, the blank layer covers the positive / negative electrode sheet and the diaphragm stacking layer, and the spacing adhesive layer at the other end is adhered to the diaphragm. In this way, not only can the final welding point be protected but also the metal dust particles remaining on the tab can be prevented from falling into the electrode group or the battery cell, but also the tab protection tape can be prevented from automatically falling off into the battery cell, causing a sharp increase in the internal resistance of the battery cell and an increase in the consistency difference between the battery cells.
[0006] The technical solution of the utility model is as follows:
[0007] A tab spacing protective tape structure is characterized in that: it includes a non-silicone release layer, a substrate layer is provided at the upper end of the non-silicone release layer, and a spacer adhesive layer is provided on both sides of the width at the upper end of the substrate layer, the width of the substrate layer is the same as the width of the non-silicone release layer, the outer side of the spacer adhesive layer coincides with the outer side of the substrate layer in the width direction, and the two spacer adhesive layers have the same width; the substrate layer uses one of polyethylene terephthalate (PET) and polypropylene (PP) as the substrate, and the substrate thickness is 12~25μm; the non-silicone release agent selected for the non-silicone release layer is a polyethylene aliphatic hydrocarbon mixture, the polyethylene aliphatic hydrocarbon mixture is dissolved in toluene and then evenly coated on the non-corona surface of the substrate through a micro-concave roller; the glue of the spacer adhesive layer is a nitrile rubber modified acrylic adhesive, and the glue thickness is 10~25μm.
[0008] Furthermore, a blank layer is formed between the two spacer adhesive layers.
[0009] Furthermore, a transparent adhesive layer is provided between the two spacer adhesive layers and at the upper end of the spacer adhesive layer, and the width of the upper end of the transparent adhesive layer is the same as the width of the substrate layer.
[0010] Furthermore, the adhesive width of the spacer adhesive layer is 20-40 mm, and the width of the blank layer is 20-1000 mm.
[0011] Beneficial effects of the utility model:
[0012] The utility model has a lighter unwinding force. When in use, the spacer adhesive layer at one end is adhered to the final welding point of the positive / negative electrode sheet and the Tab sheet, the blank layer covers the positive / negative electrode sheet and the diaphragm stacking layer, and the spacer adhesive layer at the other end is adhered to the diaphragm. In this way, it can not only protect the final welding point but also prevent the metal dust particles remaining on the pole ear from falling into the pole group or battery cell, but also prevent the pole ear protection tape from automatically falling off into the battery cell, causing the internal resistance of the battery cell to increase sharply, and the consistency difference between the battery cells to increase. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 This is a schematic diagram of the structure of the utility model when in use;
[0014] Figure 2 This is a schematic diagram of the structure A of the tab spacing protection tape of the utility model;
[0015] Figure 3 This is a schematic diagram of the structure B of the tab spacing protection tape structure of the present invention;
[0016] In the figure: 1. Negative electrode; 2. Aluminum Tab; 3. Tab spacer protective tape; 4. Copper Tab; 5. Positive electrode; 6. Battery cell; 310. Non-silicon release layer; 320. Base material layer; 330. Spacer adhesive layer; 340. Blank layer; 350. Transparent adhesive layer. DETAILED DESCRIPTION
[0017] A tab spacing protective tape structure, characterized in that: it includes a non-silicone release layer 310, a substrate layer 320 is provided at the upper end of the non-silicone release layer 310, and a spacer adhesive layer 330 is provided on the upper end of the substrate layer 320 distributed on both sides of the width, the width of the substrate layer 320 is the same as the width of the non-silicone release layer 310, the outer side of the spacer adhesive layer 330 coincides with the outer side of the substrate layer 320 in the width direction, and the two spacer adhesive layers 330 have the same width; the substrate layer 320 uses one of polyethylene terephthalate (PET) and polypropylene (PP) as the substrate, and the substrate thickness is 12~25μm; the non-silicone release agent selected for the non-silicone release layer 310 is a polyethylene aliphatic hydrocarbon mixture, the polyethylene aliphatic hydrocarbon mixture is dissolved in toluene and then evenly coated on the non-corona surface of the substrate by a micro-concave roller; the glue of the spacer adhesive layer 330 is a nitrile rubber modified acrylic adhesive, and the glue thickness is 10~25μm.
[0018] Reference Figure 1 、 Figure 2 The present application provides a tab spacing protection tape structure A, comprising a non-silicone release layer 310; a substrate layer 320; a spacing adhesive layer 330; and a blank layer 340;
[0019] Preferably, the substrate layer 320 is made of polyethylene terephthalate (PET) or polypropylene (PP), and the thickness of the substrate is 12-25 μm.
[0020] Preferably, the non-silicone release agent used in the non-silicone release layer 310 is a polyvinyl aliphatic hydrocarbon mixture, which is dissolved in toluene and then evenly coated on the non-corona surface of the substrate by a micro-concave roller;
[0021] Preferably, the glue of the spacer glue layer 330 is a nitrile rubber modified acrylic adhesive, with a glue thickness of 10-25 μm and a glue width of 20-40 mm;
[0022] Preferably, the adhesive layer color of the spacer adhesive layer 330 is bright blue, light blue, brown, green or other colors;
[0023] Preferably, the blank layer 340 has no glue and has a width of 20 to 1000 mm.
[0024] Among them, the non-silicone release layer 310 makes the tab spacing protection tape have a lighter unwinding force, one end of the spacing glue layer 330 is adhered to the final welding points of the positive electrode sheet 5 and the copper Tab sheet 4 and the negative electrode sheet 1 and the aluminum Tab sheet 2, the blank layer 340 covers the positive electrode sheet 5, the negative electrode sheet and the diaphragm stacking layer of the battery cell 6, and the other end of the spacing glue layer 330 is adhered to the diaphragm of the battery cell 6. In this way, the spacing glue layer 330 protects the final welding point and the blank layer 340 can effectively prevent the metal dust particles remaining on the tab from falling into the electrode group or the battery cell, and also prevents the tab protection tape from automatically falling off into the battery cell, causing the internal resistance of the battery cell to increase sharply, and the consistency difference between the battery cells increases.
[0025] Reference Figure 1 、 Figure 3 The present application provides another tab spacing protective tape structure B, comprising a non-silicone release layer 310; a substrate layer 320; a spacing adhesive layer 330; and a transparent adhesive layer 350;
[0026] Preferably, the substrate layer 320 is made of polyethylene terephthalate (PET) or polypropylene (PP), and the thickness of the substrate is 12-25 μm.
[0027] Preferably, the non-silicone release agent used in the non-silicone release layer 310 is a polyvinyl aliphatic hydrocarbon mixture, which is dissolved in toluene and then evenly coated on the non-corona surface of the substrate by a micro-concave roller;
[0028] Preferably, the glue of the spacer glue layer 330 is a low-viscosity acrylic adhesive, which is almost non-sticky after drying and curing, with a glue thickness of 5 μm and a glue width of 20-40 mm.
[0029] Preferably, the spacer adhesive layer 330 has an adhesive layer color of bright blue, light blue, brown, green or other colors.
[0030] Preferably, the transparent adhesive layer 350 is made of a nitrile rubber modified acrylic adhesive with a thickness of 20-25 μm. The transparent adhesive is coated on the spacer adhesive layer 330 and the blank areas of the spacer adhesive layer 330 .
[0031] Among them, the non-silicone release layer 310 makes the tab spacing protective tape have a lighter unwinding force, and the transparent adhesive layer 350 is adhered to the entire positive electrode sheet 5, the negative electrode sheet 1 and the diaphragm of the battery cell 6, while one end of the spacing adhesive layer 330 is located on the final welding point between the positive electrode sheet 5 and the copper tab sheet 4 and the negative electrode sheet 1 and the aluminum tab sheet 2, and the other end of the spacing adhesive layer 330 is located on the diaphragm of the battery cell 6. In this way, the transparent adhesive layer 350 not only protects the final welding point but also effectively prevents the metal dust particles remaining on the tab from falling into the electrode group or the battery cell. At the same time, it also prevents the tab protection tape from automatically falling off into the battery cell, causing a sharp increase in the internal resistance of the battery cell and an increase in the consistency difference between the battery cells. The spacing adhesive layer 330 makes the tab spacing tape have a certain color difference, which mainly plays a distinguishing role and improves the ability of automated equipment to recognize and capture signals.
[0032] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements or substitutions can be made without departing from the principles described in the present invention. These improvements or substitutions should also be regarded as the scope of protection of the present invention.
Claims
1. A tab spacer protective tape structure, characterized in that: The invention comprises a non-silicone release layer (310), wherein a substrate layer (320) is provided on the upper end of the non-silicone release layer (310), and a spacer adhesive layer (330) is provided on the upper end of the substrate layer (320) and distributed on both sides of the width, wherein the width of the substrate layer (320) is the same as that of the non-silicone release layer (310), the outer side of the spacer adhesive layer (330) coincides with the outer side of the substrate layer (320) in the width direction, and the widths of the two spacer adhesive layers (330) are the same; The substrate layer (320) is made of one of polyethylene terephthalate (PET) and polypropylene (PP), and the thickness of the substrate is 12-25 μm. The non-silicone release agent used in the non-silicone release layer (310) is a polyethylene aliphatic hydrocarbon mixture, which is dissolved in toluene and then evenly coated on the non-corona surface of the substrate by a micro-concave roller. The glue of the spacer adhesive layer (330) is a nitrile rubber modified acrylic adhesive, and the thickness of the glue is 10-25 μm.
2. The tab spacing protective tape structure according to claim 1, characterized in that: A blank layer (340) is formed between the two spacer adhesive layers (330).
3. The tab spacing protective tape structure according to claim 1, characterized in that: A transparent adhesive layer (350) is provided between the two spacer adhesive layers (330) and at the upper end of the spacer adhesive layer (330), and the width of the upper end of the transparent adhesive layer (350) is the same as the width of the base material layer (320).
4. The tab spacing protective tape structure according to claim 2, characterized in that: The adhesive width of the spacer adhesive layer (330) is 20-40 mm, and the width of the blank layer (340) is 20-1000 mm.