Negative electrode structure of an electronic cigarette battery

Abstract

This utility model relates to the technical field of electronic cigarette battery cell components, and discloses a negative electrode structure for an electronic cigarette battery cell, including a current collector. The outer surface of the current collector is uniformly coated with an adhesive layer. Through an optimized multi-layer negative electrode structure, combined with a copper foil current collector, a polytetrafluoroethylene protective coating, a carbon nanotube conductive reinforcement layer, a metal nanoparticle conductive agent layer, and active material layers such as graphite, silicon, and lithium titanium oxide, it effectively solves problems such as lithium plating, internal short circuits, SEI film instability, and capacity loss in traditional negative electrode structures. This innovative design improves the battery's conductivity and stability, ensuring performance during high-rate discharge, while reducing electrolyte erosion of the negative electrode and effectively extending the battery's cycle life. The overall optimization of the negative electrode structure enhances the battery's safety, energy density, and long-term reliability, resulting in better stability and lower irreversible capacity loss during long-term use.

Description

Technical Field

[0001] This utility model relates to the technical field of electronic cigarette battery cell components, specifically to a negative electrode structure for an electronic cigarette battery cell. Background Technology

[0002] The negative electrode structure of an e-cigarette battery cell is one of its core components, directly affecting the cell's performance, safety, and lifespan. Typically, e-cigarette batteries use lithium-ion or lithium-polymer batteries. The negative electrode structure refers to the overall composition and design of the negative electrode portion in a lithium battery, including material selection, layered layout, and manufacturing processes. This is one of the key factors affecting battery performance, safety, and lifespan.

[0003] In traditional negative electrode structures, lithium ions are unevenly deposited on the negative electrode, which easily leads to lithium plating, causing internal short circuits and posing certain safety hazards. At the same time, after the battery has been used for a long time, if the electrolyte comes into direct contact with the negative electrode structure, it can easily lead to instability of the SEI film, excessively rapid or uneven film growth, resulting in irreversible capacity loss of the battery.

[0004] Therefore, it is necessary to design a negative electrode structure for electronic cigarette cells to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a negative electrode structure for an electronic cigarette battery cell, which solves the technical problems mentioned in the background section.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a negative electrode structure for an electronic cigarette cell, comprising a current collector, an adhesive layer uniformly coated on the outer surface of the current collector, a conductive reinforcement layer bonded to the outer surface of the current collector through the adhesive layer, a conductive agent layer coated on top of the conductive reinforcement layer, an active material layer coated on top of the conductive agent layer, a protective coating bonded to the outer surface of the active material layer, and a raised / lowered area provided on top of the current collector.

[0007] Preferably, the current collector is made of copper foil, and the outer surface of the current collector is plated with nickel, and the thickness of the current collector is 6-9 micrometers.

[0008] Preferably, the adhesive layer is made of PVDF, and the adhesive material between the active material layer and the protective coating is PVDF, and the conductive reinforcement layer is made of carbon nanotubes, and the thickness of the conductive reinforcement layer is 1-3 micrometers.

[0009] Preferably, the conductive agent layer is made of metal nanoparticles, and the thickness of the conductive agent layer is 0.5-1 micrometer.

[0010] The technical solution provided by this utility model has the following advantages compared with the prior art:

[0011] This invention, through an optimized multi-layered negative electrode structure, combines a copper foil current collector, a polytetrafluoroethylene protective coating, a carbon nanotube conductive reinforcement layer, a metal nanoparticle conductive agent layer, and active material layers made of graphite, silicon, and lithium titanium oxide, effectively solving problems such as lithium plating, internal short circuits, SEI film instability, and capacity loss in traditional negative electrode structures. This innovative design improves the battery's conductivity and stability, ensuring performance at high discharge rates, while reducing electrolyte erosion of the negative electrode and effectively extending the battery's cycle life. The overall optimized negative electrode structure enhances battery safety, energy density, and long-term reliability, resulting in better stability and lower irreversible capacity loss during long-term use. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the layered structure of this utility model;

[0013] Figure 2 This is a schematic diagram of the concave-convex area structure of this utility model;

[0014] In the diagram: 1. Current collector; 2. Adhesive layer; 3. Conductive reinforcement layer; 4. Conductive agent layer; 5. Active material layer; 6. Protective coating; 7. Undulated area. Detailed Implementation

[0015] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0016] Obviously, many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0017] Please see Figure 1-2This utility model provides a negative electrode structure for an electronic cigarette battery cell, including a current collector 1. An adhesive layer 2 is uniformly coated on the outer surface of the current collector 1, and a conductive reinforcement layer 3 is bonded to the outer surface of the current collector 1 via the adhesive layer 2. A conductive agent layer 4 is coated on top of the conductive reinforcement layer 3, and an active material layer 5 is coated on top of the conductive agent layer 4. A protective coating 6 is bonded to the outer surface of the active material layer 5, and a raised / lowered area 7 is provided on the top of the current collector 1. By optimizing the combination of materials and structures in each layer, the safety hazards and performance degradation problems existing in traditional negative electrode structures are significantly improved. Firstly, this structure, through a reasonable layer design, effectively avoids uneven lithium ion deposition, thereby reducing the occurrence of lithium plating and avoiding the risk of internal short circuits caused by lithium plating, thus improving battery safety. Furthermore, the combination of the conductive reinforcement layer 3 and the protective coating 6 reduces direct contact between the electrolyte and the negative electrode material, preventing unstable growth and excessively rapid thickening of the SEI film. This ensures the battery's stability and low irreversible capacity loss during long-term use. Simultaneously, by optimizing the material ratio and structural combination, the adhesion between the negative electrode material and the current collector 1 is enhanced, extending the battery's cycle life. The overall structural design not only improves the battery's performance during high-rate discharge and long-term use but also significantly enhances its safety and stability, effectively solving the capacity decay and battery performance degradation problems commonly found in traditional negative electrode structures.

[0018] The current collector 1 is made of copper foil, and its outer surface is plated with nickel. The current collector 1 has a thickness of 6-9 micrometers. The design of the current collector 1 ensures efficient electron flow during battery charging and discharging. To improve corrosion resistance, the outer surface of the current collector is plated with nickel, which further enhances its bonding force with the negative electrode material and prevents corrosion problems during long-term use.

[0019] The adhesive layer 2 and the bonding material between the active material layer 5 and the protective coating layer 6 are both PVDF. The conductive reinforcement layer 3 is made of carbon nanotubes, and its thickness is 1-3 micrometers. The design of the adhesive layer 2 utilizes PVDF, which possesses excellent chemical stability and mechanical strength, ensuring a tight bond between the layers and preventing the active material layer from detaching during battery charging and discharging. Its excellent adhesion also effectively reduces the contact between the electrolyte and the negative electrode surface, lowering the instability of the SEI film. Furthermore, the use of carbon nanotubes as the conductive reinforcement layer material provides extremely high electronic conductivity and improves the battery's cycle stability.

[0020] The conductive agent layer 4 is made of metal nanoparticles and has a thickness of 0.5-1 micrometer. The use of metal nanoparticles as a conductive agent in this layer can greatly improve the conductivity of the electrode. The thickness of 0.5-1 micrometer ensures that the electrode can conduct electrons quickly and efficiently during the high-rate discharge process of the battery, while avoiding energy loss caused by excessive resistance.

[0021] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0022] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable way without contradiction. In order to avoid unnecessary repetition, this utility model will not describe the various possible combinations separately.

[0023] Furthermore, various different embodiments of this utility model can be combined in any way, as long as they do not violate the spirit of this utility model, they should also be regarded as the content disclosed by this utility model.

Claims

1. A negative electrode structure of an electronic cigarette cell, comprising a current collector (1), characterized in that: The outer surface of the current collector (1) is uniformly coated with an adhesive layer (2), and the outer surface of the current collector (1) is bonded with a conductive reinforcement layer (3) through the adhesive layer (2). The top of the conductive reinforcement layer (3) is coated with a conductive agent layer (4), and the top of the conductive agent layer (4) is coated with an active material layer (5). The outer surface of the active material layer (5) is bonded with a protective coating (6), and the top of the current collector (1) is provided with a concave-convex area (7).

2. The negative electrode structure of an electronic cigarette battery cell according to claim 1, characterized in that: The current collector (1) is made of copper foil, and the outer surface of the current collector (1) is plated with nickel. The thickness of the current collector (1) is 6-9 micrometers.

3. The negative electrode structure of an electronic cigarette battery cell of claim 1, wherein: The adhesive layer (2) is made of PVDF, and the adhesive material between the active material layer (5) and the protective coating (6) is PVDF. The conductive reinforcement layer (3) is made of carbon nanotubes, and the thickness of the conductive reinforcement layer (3) is 1-3 micrometers.

4. The negative electrode structure of an electronic cigarette battery cell of claim 1, wherein: The conductive agent layer (4) is made of metal nanoparticles, and the thickness of the conductive agent layer (4) is 0.5-1 micrometer.

Images