Flexible micro-deformation lithium battery

Abstract

The utility model relates to the technical field of lithium batteries, and discloses a flexible micro-deformation lithium battery which comprises a flexible lithium battery shell, a positive plate is arranged in the flexible lithium battery shell, a negative plate is arranged at the bottom of the positive plate, and diaphragm layers are arranged at the top and the bottom of the positive plate and the bottom of the negative plate. The flexible connecting layer is arranged on the outer side of the diaphragm layer, the filling layers are arranged among the positive plate, the negative plate and the diaphragm layer, and the flexible connecting layer can effectively absorb and disperse stress generated in bending and folding processes during bending of the flexible lithium battery shell, so that interlayer separation and short circuit phenomena are prevented. According to the flexible lithium battery, the flexible connecting layers are additionally arranged between the positive plate and the negative plate and outside the positive plate and the negative plate, so that stress generated in bending and folding processes can be effectively absorbed and dispersed, interlayer separation and short circuit phenomena are prevented, and the stability and the safety of the flexible lithium battery are remarkably improved.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery technology, and in particular to a flexible micro-deformation lithium battery. Background Technology

[0002] The traditional lithium battery structure mainly consists of four parts: positive electrode, negative electrode, separator, and electrolyte. The selection and structural design of the positive and negative electrode materials play a decisive role in the performance of the lithium battery. Positive electrode materials typically have high energy density, such as lithium cobalt oxide and ternary materials, while negative electrode materials require good conductivity and stability, such as graphite and silicon-based materials. The separator, as a key component of the lithium battery, mainly functions to isolate the positive and negative electrodes and prevent short circuits. Traditional separator materials are mostly polyolefin polymers, possessing excellent mechanical properties and chemical stability. However, with the continuous development of lithium battery technology, the performance requirements for separators are constantly increasing; for example, separators need to have higher ion conductivity, lower resistivity, and better thermal stability. The electrolyte is another important component of the lithium battery, responsible for transferring ions between the positive and negative electrodes to achieve the charging and discharging process. Traditional electrolytes are mostly organic liquids, possessing good ion conductivity and chemical stability.

[0003] With the continuous development of technology, flexible electronic products have gradually gained market favor. As the core component of flexible electronic products, the structural design of flexible lithium batteries plays a key role in improving product performance and service life. Traditional flexible lithium battery structural design usually adopts a multi-layer structure, which includes key components such as positive and negative electrode material layers, separator layers, and electrolyte. In order to realize the basic functions of the battery, these layers are stably composited with adhesives or hot pressing processes.

[0004] However, traditional flexible lithium battery structures are prone to defects such as interlayer separation and short circuits when subjected to bending and folding. Traditional flexible lithium battery structures are fragile and easily damaged when subjected to bending and folding, which directly leads to a decrease in battery performance and may even cause safety accidents.

[0005] Flexible lithium batteries are prone to interlayer separation and short circuits during bending and folding. To address these issues, a flexible micro-deformation lithium battery is proposed. Utility Model Content

[0006] To overcome the above shortcomings, this utility model provides a flexible micro-deformation lithium battery, which aims to improve the problems of interlayer separation and short circuits that easily occur in the bending and folding process of existing flexible lithium batteries.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A flexible micro-deformation lithium battery includes a flexible lithium battery casing, a positive electrode sheet disposed inside the flexible lithium battery casing, a negative electrode sheet disposed at the bottom of the positive electrode sheet, a separator layer disposed at the top and bottom of the positive electrode sheet and the bottom of the negative electrode sheet, a flexible connecting layer disposed on the outside of the separator layer, and a filling layer disposed between the positive electrode sheet, the negative electrode sheet and the separator layer.

[0009] As a further description of the above technical solution:

[0010] Both the positive and negative electrode plates are coated with a nano-coating.

[0011] As a further description of the above technical solution:

[0012] The positive electrode is made of carbon nanotubes.

[0013] As a further description of the above technical solution:

[0014] The negative electrode is made of graphene-based material.

[0015] As a further description of the above technical solution:

[0016] The membrane layer is a polyolefin microporous membrane.

[0017] This utility model has the following beneficial effects:

[0018] 1. In this utility model, by adding a flexible connecting layer between and outside the positive and negative electrode sheets, the stress generated during bending and folding can be effectively absorbed and dispersed, preventing interlayer separation and short circuits, and significantly improving the stability and safety of the flexible lithium battery.

[0019] 2. In this invention, coating the surfaces of the positive and negative electrodes with a nano-coating structure can increase the specific surface area of ​​the positive and negative electrode materials. This can improve the lithium-ion diffusion rate and reactivity by increasing the specific surface area, thereby enhancing the charge-discharge performance and energy density of the battery. Attached Figure Description

[0020] Figure 1 This is a three-dimensional schematic diagram of a flexible micro-deformation lithium battery proposed in this utility model;

[0021] Figure 2 This utility model Figure 1 Enlarged schematic diagram of the structure at point A;

[0022] Figure 3 This is an exploded three-dimensional structural diagram of the positive electrode, negative electrode, and flexible connecting layer of a flexible micro-deformation lithium battery proposed in this utility model.

[0023] Figure 4 This is a three-dimensional cross-sectional view of the nano-coating structure of a flexible micro-deformation lithium battery proposed in this utility model.

[0024] Legend:

[0025] 1. Flexible lithium battery casing; 2. Positive electrode sheet; 3. Negative electrode sheet; 4. Separator layer; 5. Flexible connecting layer; 6. Filler layer; 7. Nano-coating. Detailed Implementation

[0026] 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.

[0027] Reference Figure 1-3This utility model provides an embodiment of a flexible micro-deformable lithium battery, comprising a flexible lithium battery casing 1, a positive electrode 2 disposed inside the flexible lithium battery casing 1, a negative electrode 3 disposed at the bottom of the positive electrode 2, and a separator layer 4 disposed at the top and bottom of the positive electrode 2 and the bottom of the negative electrode 3, the separator layer 4 being located between the positive electrode 2 and the negative electrode 3, serving to isolate the positive and negative electrodes and prevent short circuits. A flexible connecting layer 5 is disposed on the outside of the separator layer 4, the flexible connecting layer 5 being three layers, which can enhance the flexibility and stability of the overall lithium battery structure. The flexible connecting layer 5 is made of a highly elastic material, which can effectively absorb and disperse the stress generated during bending and folding, thereby preventing interlayer separation and short circuits. It can be bent and micro-deformed during use. The micro-deformable flexible lithium-ion battery has a wide range of applications, including wearable devices, smart homes, medical devices, and electronic tags. In the field of wearable devices, flexible lithium-ion batteries can be manufactured to be lighter, thinner, and more flexible. This makes wearable devices more comfortable and fits the human body better. In the smart home field, flexible lithium-ion batteries can be made into smaller and lighter batteries, which can better meet the battery needs of various smart home devices. In the medical device field, flexible lithium-ion batteries can be made into thinner and more flexible batteries, which can better adapt to the form and function of medical devices. In the electronic tag field, flexible lithium-ion batteries can be made into smaller and thinner batteries, which can better adapt to the application scenarios of electronic tags. A filling layer 6 is provided between the positive electrode 2, the negative electrode 3, and the separator layer 4. The filling layer 6 is an electrolyte. The electrolyte fills the space between the positive electrode 2, the negative electrode 3, and the separator layer 4, providing a channel for lithium-ion transport. Ions are transferred between the positive electrode 2 and the negative electrode 3 to realize the charging and discharging process of the battery. Furthermore, this technology adopts a roll-to-roll continuous production process, which can complete the composite and encapsulation of the positive electrode 2, the negative electrode 3, the separator layer 4, and the flexible connecting layer 5 in one go, which greatly improves production efficiency and reduces costs.

[0028] Reference Figure 2-4 Both the positive electrode 2 and the negative electrode 3 are coated with a nano-coating 7. In order to improve battery performance, the nano-coating 7 is coated on the surface of the positive electrode 2 and the negative electrode 3. The nano-coating 7 can increase the specific surface area of ​​the positive electrode 2 and the negative electrode 3, improve the diffusion rate and reactivity of lithium ions, thereby significantly improving the charging and discharging efficiency and energy density of the battery.

[0029] Reference Figure 1-3 The positive electrode 2 is made of carbon nanotubes; the negative electrode 3 is made of graphene. The selection of carbon nanotubes for the positive electrode 2 and graphene for the negative electrode 3 can significantly improve the conductivity and flexibility of the positive electrode 2 and the negative electrode 3. The separator layer 4 is a polyolefin microporous membrane. The selection of polyolefin microporous membrane for the separator layer 4 can enhance its isolation effect and puncture resistance.

[0030] Working principle: A flexible connecting layer 5 is set between the positive electrode 2 and the negative electrode 3, and two flexible connecting layers 5 are set on the outside of the separator layer 4. The multiple flexible connecting layers 5 are integrated into the flexible lithium battery shell 1 by a roll-to-roll continuous production process. This flexible connecting layer 5 can effectively absorb and disperse the stress generated during bending and folding of the flexible lithium battery shell 1, thereby preventing interlayer separation and short circuit. It also prevents the flexible lithium battery shell 1 from experiencing interlayer separation, short circuit and other adverse phenomena during bending and folding.

[0031] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. 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. A flexible micro-deformation lithium battery, comprising a flexible lithium battery casing (1), characterized in that: The flexible lithium battery casing (1) has a positive electrode (2) inside, a negative electrode (3) at the bottom of the positive electrode (2), a separator layer (4) at the top and bottom of the positive electrode (2) and the bottom of the negative electrode (3), a flexible connecting layer (5) at the outside of the separator layer (4), and a filling layer (6) between the positive electrode (2), the negative electrode (3) and the separator layer (4).

2. The flexible micro-deformation lithium battery according to claim 1, characterized in that: The surfaces of the positive electrode (2) and the negative electrode (3) are coated with a nano-coating (7).

3. The flexible micro-deformation lithium battery according to claim 1, characterized in that: The positive electrode (2) is made of carbon nanotubes.

4. A flexible micro-deformation lithium battery according to claim 1, characterized in that: The negative electrode (3) is made of graphene-based material.

5. A flexible micro-deformation lithium battery according to claim 1, characterized in that: The membrane layer (4) is a polyolefin microporous membrane.

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