A high energy density pouch polymer battery

Abstract

The utility model discloses a kind of high-energy-density soft package polymer batteries, it is related to lithium ion battery technical field, including positive and negative electrode material, diaphragm and electrolyte composition internal electric core and the aluminum-plastic composite film packaging structure for the encapsulation of electric core, the aluminum-plastic composite film packaging structure includes the heat-seal inner layer bonded with electric core, the outside of heat-seal inner layer is bonded with metal layer.The utility model provides powerful gas / liquid barrier function by the metal layer of high-purity aluminum foil composition, and the nanometer coating or graphene coating further enhanced its thermal conductivity and corrosion resistance, which makes battery more stable and reliable when facing external environment change;By setting elastic buffer layer in the edge or entire outer surface of aluminum-plastic composite film packaging structure, especially the design of corner reinforcing rib, the resistance of battery to external physical impact is greatly enhanced, and the damage risk caused by accidental drop or collision is reduced.

Description

Technical Field

[0001] This utility model relates to the field of lithium-ion battery technology, specifically a high-energy-density soft-pack polymer battery. Background Technology

[0002] With the rapid development of the portable electronic device and electric vehicle markets, the requirements for battery energy density, safety, and lifespan are increasing. Lithium-ion batteries, as one of the most mainstream energy storage technologies, have been widely used in numerous fields. However, traditional hard-shell lithium-ion batteries, due to their inherent design limitations, face problems such as increased weight and poor shape flexibility while pursuing higher energy density. In contrast, pouch polymer batteries have become a research hotspot due to their lightweight and flexible design advantages. Nevertheless, the safety of existing pouch polymer batteries under extreme conditions still needs further improvement.

[0003] While existing pouch polymer batteries offer advantages in energy density and design flexibility, their safety performance under extreme conditions (such as overheating and impact) still needs further improvement. Therefore, this invention proposes a high-energy-density pouch polymer battery. Utility Model Content

[0004] Technical problems to be solved The purpose of this invention is to overcome the shortcomings of the existing technology and provide a high-energy-density soft-pack polymer battery.

[0005] Technical solution To achieve the above objectives, this utility model provides the following technical solution: a high-energy-density soft-pack polymer battery, comprising an internal cell composed of positive and negative electrode materials, a separator, and an electrolyte, and an aluminum-plastic composite film encapsulation structure for encapsulating the cell. The aluminum-plastic composite film encapsulation structure includes a heat-sealed inner layer that is heat-sealed and bonded to the cell. A metal layer is bonded to the outside of the heat-sealed inner layer. A barrier layer is disposed outside the metal layer. A heat-sealed protective layer is disposed outside the barrier layer. Nano-coatings or graphene coatings are disposed on both sides of the metal layer. The metal layer, composed of high-purity aluminum foil, provides a strong gas / liquid barrier function, and the nano-coatings or graphene coatings disposed on both sides further enhance its thermal conductivity and corrosion resistance, making the battery more stable and reliable in the face of changes in the external environment. An elastic buffer layer is provided on the outside of the aluminum-plastic composite film encapsulation structure. The elastic buffer layer is provided on the edge or the entire outer surface of the aluminum-plastic composite film encapsulation structure. The elastic buffer layer includes corner reinforcing ribs provided at the corners of the aluminum-plastic composite film encapsulation structure. Multiple corner reinforcing ribs are connected by a connecting layer. By providing an elastic buffer layer on the edge or the entire outer surface of the aluminum-plastic composite film encapsulation structure, especially the design of corner reinforcing ribs, the battery's resistance to external physical impact is greatly enhanced, reducing the risk of damage caused by accidental drops or collisions.

[0006] Preferably, the heat-sealing inner layer is made of modified polypropylene, the metal layer is made of high-purity aluminum foil, the barrier layer is made of high-density polyethylene or nylon, and the heat-sealing protective layer is made of modified polypropylene or polyester film.

[0007] Preferably, the layers of the aluminum-plastic composite film encapsulation structure are connected by an adhesive layer.

[0008] Preferably, the connecting layer is made of one of silicone rubber, TPU, or microporous foam material.

[0009] Preferably, a phase change material is embedded inside the connecting layer.

[0010] Preferably, the phase change material includes one or a combination of paraffins, fatty acids, and inorganic salt hydrates.

[0011] Preferably, the adhesive layer is a hot melt adhesive.

[0012] Beneficial effects: Compared with existing technologies, this high-energy-density pouch polymer battery has the following advantages: This invention provides a strong gas / liquid barrier function through a metal layer composed of high-purity aluminum foil, and the nano-coating or graphene coating on both sides further enhances its thermal conductivity and corrosion resistance, making the battery more stable and reliable in the face of changes in the external environment. By setting an elastic buffer layer at the edge or on the entire outer surface of the aluminum-plastic composite film encapsulation structure, especially the design of corner reinforcing ribs, the battery's resistance to external physical impacts is greatly enhanced, reducing the risk of damage caused by accidental drops or collisions. Attached Figure Description

[0013] 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.

[0014] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the external structure of this utility model; Figure 3 This is a cross-sectional structural diagram of the present invention; Figure 4 This is a schematic diagram of the battery cell and aluminum-plastic composite film packaging structure of this utility model.

[0015] Figure 5 This is a schematic diagram of the structure of the nano-coating of this utility model.

[0016] Figure 6 This is a schematic diagram of the graphene coating structure of this utility model.

[0017] In the picture: 1. Battery cell; 2. Aluminum-plastic composite film encapsulation structure; 201. Heat-sealed inner layer; 202. Metal layer; 203. Barrier layer; 204. Heat-sealed protective layer; 205. Nano coating; 206. Graphene coating; 3. Elastic buffer layer; 301. Corner reinforcing rib; 302. Connecting layer. Detailed Implementation

[0018] 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.

[0019] Please see Figures 1-6 As shown, this utility model provides a technical solution: a high-energy-density soft-pack polymer battery, including an internal cell composed of positive and negative electrode materials, a separator, and an electrolyte, and an aluminum-plastic composite film encapsulation structure 2 for encapsulating the cell 1. The aluminum-plastic composite film encapsulation structure 2 includes a heat-sealed inner layer 201 that is heat-sealed and bonded to the cell 1. A metal layer 202 is bonded to the outside of the heat-sealed inner layer 201. A barrier layer 203 is disposed outside the metal layer 202. A heat-sealed protective layer 204 is disposed outside the barrier layer 203. Nano-coatings 205 or graphene coatings 206 are disposed on both sides of the metal layer 202. The metal layer 202, composed of high-purity aluminum foil, provides a strong gas / liquid barrier function, and the nano-coatings or graphene coatings 205 disposed on both sides further enhance its thermal conductivity and corrosion resistance, making the battery more stable and reliable when facing changes in the external environment.

[0020] The aluminum-plastic composite film encapsulation structure 2 of this utility model is provided with an elastic buffer layer 3 on its exterior. The elastic buffer layer 3 is provided on the edge or the entire outer surface of the aluminum-plastic composite film encapsulation structure 2. The elastic buffer layer 3 includes corner reinforcing ribs 301 provided at the corners of the aluminum-plastic composite film encapsulation structure 2. Multiple corner reinforcing ribs 301 are connected by a connecting layer 302. By providing the elastic buffer layer 3 on the edge or the entire outer surface of the aluminum-plastic composite film encapsulation structure 2, especially the design of the corner reinforcing ribs 301, the battery's resistance to external physical impact is greatly enhanced, and the risk of damage caused by accidental drops or collisions is reduced.

[0021] Please refer to the following carefully. Figure 3 , Figure 4 and Figure 5 The heat-sealed inner layer 201 is made of modified polypropylene. Using modified polypropylene as the material for the heat-sealed inner layer 201 not only ensures good adhesion and sealing with the battery cell 1, but also improves chemical corrosion resistance, effectively preventing electrolyte leakage and external moisture intrusion, thereby extending the battery's service life. The metal layer 202 is made of high-purity aluminum foil, the barrier layer 203 is made of high-density polyethylene or nylon, and the heat-sealed protective layer 204 is made of modified polypropylene or polyester film. The various layers of the aluminum-plastic composite film encapsulation structure 2 are connected by an adhesive layer, which is a hot melt adhesive. Using high-density polyethylene or nylon as the barrier layer 203 can effectively prevent oxygen, moisture, and other substances from affecting the internal battery cell, ensuring the stability of the battery during long-term use. The external heat-sealed protective layer 204 is made of modified polypropylene or polyester film, which gives the battery excellent scratch resistance, wear resistance, and good weather resistance, making it suitable for various harsh working environments.

[0022] Please refer to the following carefully. Figure 3 and Figure 4 The connecting layer 302 is made of one of silicone rubber, TPU or microporous foam material. The connecting layer 302 is embedded with a phase change material, which includes one or a combination of paraffin, fatty acid and inorganic salt hydrate. The phase change material embedded in the connecting layer 302 utilizes its heat absorption and heat release characteristics to automatically regulate the temperature during battery operation, avoid local overheating, and improve the safety and efficiency of the battery.

[0023] Working principle: The metal layer 202, made of high-purity aluminum foil, provides a strong gas / liquid barrier function, and the nano-coating or graphene coating 205 on both sides further enhances its thermal conductivity and corrosion resistance, making the battery more stable and reliable in the face of changes in the external environment; by setting an elastic buffer layer 3 on the edge or the entire outer surface of the aluminum-plastic composite film encapsulation structure 2, especially the design of the corner reinforcing ribs 301, the battery's resistance to external physical impact is greatly enhanced, reducing the risk of damage caused by accidental drops or collisions.

[0024] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0025] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-energy-density soft-pack polymer battery, comprising an internal cell composed of positive and negative electrode materials, a separator, and an electrolyte, and an aluminum-plastic composite film encapsulation structure (2) for encapsulating the cell (1), characterized in that: The aluminum-plastic composite film encapsulation structure (2) includes a heat-sealed inner layer (201) that is heat-sealed and bonded to the battery cell (1). A metal layer (202) is bonded to the outside of the heat-sealed inner layer (201). A barrier layer (203) is provided on the outside of the metal layer (202). A heat-sealed protective layer (204) is provided on the outside of the barrier layer (203). A nano-coating (205) or a graphene coating (206) is provided on both sides of the metal layer (202). The aluminum-plastic composite film encapsulation structure (2) is provided with an elastic buffer layer (3) on the outside. The elastic buffer layer (3) is provided on the edge or the entire outer surface of the aluminum-plastic composite film encapsulation structure (2). The elastic buffer layer (3) includes corner reinforcing ribs (301) provided at the corners of the aluminum-plastic composite film encapsulation structure (2). Multiple corner reinforcing ribs (301) are connected by a connecting layer (302).

2. The high energy density soft-pack polymer battery according to claim 1, characterized in that: The heat-sealing inner layer (201) is made of modified polypropylene, the metal layer (202) is made of high-purity aluminum foil, the barrier layer (203) is made of high-density polyethylene or nylon, and the heat-sealing protective layer (204) is made of modified polypropylene or polyester film.

3. A high-energy-density soft-pack polymer battery according to claim 1, characterized in that: The layers of the aluminum-plastic composite film encapsulation structure (2) are connected by an adhesive layer.

4. A high-energy-density soft-pack polymer battery according to claim 1, characterized in that: The connecting layer (302) is made of one of the following materials: silicone rubber, TPU, or microporous foam.

5. The high energy density soft-pack polymer battery of claim 1, wherein: The connecting layer (302) has a phase change material embedded inside.

6. The high energy density pouch polymer battery of claim 5, wherein: The phase change material includes one or a combination of paraffins, fatty acids, and inorganic salt hydrates.

7. A high-energy-density soft-pack polymer battery according to claim 3, characterized in that: The adhesive layer is a hot melt adhesive.

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