Durable battery cell with double-carbon structure

Abstract

The invention relates to a durable battery cell with a dual-carbon structure, which comprises two positive pole plates and two negative pole plates, and a capacitance-level diaphragm is arranged between the lower end part of the top positive pole plate and the upper end part of the bottom negative pole plate; one side, close to the capacitance-level diaphragm, of the bottom positive electrode plate is fixedly connected with a positive electrode composite ion coating with one end fixedly connected with the capacitance-level diaphragm. The durable battery cell with the dual-carbon structure can form a laminated or coiled structural form, the nano activated carbon coating is composed of a C60 (C60) molecular structure, the pore diameter of 96% or more among molecules is 1.6-2.8 nm, and the consistency is high, so that the structure is more stable, the safety is higher, and the service life is longer; compared with an existing lithium ion battery, the lithium ion battery is more suitable for ions to shuttle in and out, and contact internal resistance of positive and negative electrode materials and a current collector can be effectively reduced, so that internal resistance of the battery is reduced, and rate performance and low-temperature characteristics of the battery are improved; the structure can accommodate more ions, thereby bringing higher energy density.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lithium ion battery cell, in particular to a durable cell with double carbon structure. BACKGROUND

[0002] Lithium ion battery is a kind of battery with lithium metal or lithium alloy as positive / negative electrode material and using non-aqueous electrolyte solution. Due to the chemical characteristics of lithium metal being very active, the processing, preservation and use of lithium metal have very high requirements on the environment. With the development of science and technology, lithium ion battery has become the mainstream.

[0003] Lithium ion battery has been widely used in civil, power and other fields. However, the industrialized lithium ion battery has not fundamentally solved the safety problem caused by short circuit. When the lithium ion battery cell is pierced by foreign matter or metal, the foreign matter will pierce the pole piece and the diaphragm, the positive and negative pole pieces will be in contact and short circuit to generate Joule heat, the positive electrode and the electrolyte will react and release oxygen under the action of heat, and the electrolyte will burn and cause the cell to catch fire and explode under the double action of heat and oxygen.

[0004] The positive electrode of the existing lithium ion battery cell generally uses aluminum foil, and the negative electrode generally uses copper foil. In order to improve the safety performance of the battery, such as the method of selecting PE and PP polyolefin diaphragm surface coated with ceramic aluminum oxide, when the cell is under abnormal high temperature condition, or the pole piece is damaged and slight short circuit heat is generated, the ceramic diaphragm can greatly reduce the short circuit or short circuit expansion trend of the positive and negative pole pieces due to the low shrinkage rate. However, the cost of coating ceramic is very high, and the coating is too thin and does not work, and the coating is too thick and will significantly reduce the energy density of the battery, thereby affecting the conductivity effect and storage capacity of the lithium ion battery cell. Therefore, a durable cell with double carbon structure is proposed to solve the above problems. SUMMARY

[0005] In view of the deficiencies of the prior art, the present application provides a durable cell with double carbon structure, which has more stable structure, higher safety and longer service life. Compared with the existing lithium ion battery, it is more suitable for ion shuttling in and out, can effectively reduce the contact resistance of the positive and negative materials and the current collector, thereby reducing the internal resistance of the battery and improving the rate performance and low temperature characteristics of the battery. The structure can accommodate more ions, thereby bringing higher energy density. In order to achieve the above purpose, the present application provides the following technical scheme: a durable cell with double carbon structure, comprising two positive pole plates and two negative pole plates, wherein a capacitor level diaphragm is arranged between the lower end of the top positive pole plate and the upper end of the bottom negative pole plate. The side close to the capacitor level diaphragm of the positive plate at the bottom is fixedly connected with a positive composite ion coating having one end fixedly connected with the capacitor level diaphragm, the side close to the capacitor level diaphragm of the negative plate at the top is fixedly connected with a negative composite ion coating having one end fixedly connected with the capacitor level diaphragm, the inner side of the two positive plates and negative plates is fixedly connected with a nano activated carbon coating, the inner side of the two nano activated carbon coatings is fixedly connected with a graphene coating, and the graphene coatings are fixedly connected with a coating aluminum foil between them.

[0006] Further, the nano activated carbon coating is composed of C60 molecular structure and is a single material layer.

[0007] Further, the pore diameter between the molecules of the nano activated carbon coating is 96% or more between 1.6-2.8 nm, and the two positive plates and negative plates are symmetrically distributed on the upper and lower sides of the capacitor level diaphragm.

[0008] Further, the coating aluminum foil is composed of an aluminum foil, a positive coating and a negative coating, the positive coating is distributed on the upper and lower sides of the top aluminum foil, and the negative coating is distributed on the upper and lower sides of the bottom aluminum foil.

[0009] Further, the positive coating is mixed of nano activated carbon, polyvinylidene fluoride, N-methyl pyrrolidone, carbon black conductive agent, graphene and positive composite ions.

[0010] Further, the density of the positive coating is 120 mg·cm -2 ×2, and the aluminum foil is a carbon-coated aluminum foil.

[0011] Further, the negative coating is mixed of nano activated carbon, polyvinylidene fluoride, N-methyl pyrrolidone, carbon black conductive agent, graphene and negative composite ions.

[0012] Compared with the prior art, the technical scheme has the following beneficial effects: 1. The durable battery with double carbon structure is composed of a positive plate, a diaphragm and a negative plate, and the composite ion coating is coated on the positive plate and the negative plate, the nano activated carbon coating is coated on the side away from the capacitor level diaphragm, the nano activated carbon coating is composed of C60 molecular structure, the pore diameter between the molecules is high, and 96% or more is between 1.6-2.8 nm, so compared with the existing lithium ion battery, the battery is more suitable for ion shuttling in and out, can accommodate more ions, and thus has higher energy density.

[0013] 2、The double-carbon-structure durable battery cell, since the coating aluminum foil inside the positive plate and the negative plate is composed of aluminum foil, positive coating and negative coating, and the positive coating is composed of nano activated carbon, polyvinylidene fluoride, N-methyl pyrrolidone, carbon black conductive agent, graphene and positive composite ions, and the negative coating is composed of nano activated carbon, polyvinylidene fluoride, N-methyl pyrrolidone, carbon black conductive agent, graphene and negative composite ions, can effectively reduce the contact resistance of the positive and negative materials and the current collector, thereby reducing the internal resistance of the battery and improving the rate performance of the battery. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the application; Figure 2 It is the application Figure 1 A enlarged view in the application; Figure 3 It is the application Figure 1 B enlarged view in the application.

[0015] In the figure: 1 positive plate, 2 negative plate, 3 capacitor level separator, 4 nano activated carbon coating, 5 graphene coating, 6 coating aluminum foil, 61 aluminum foil, 62 positive coating, 63 negative coating, 7 positive composite ion coating, 8 negative composite ion coating. EMBODIMENT

[0016] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the application.

[0017] Please refer to Figure 1 A double-carbon-structure durable battery cell in the embodiment includes two positive plates 1 and two negative plates 2. A capacitor level separator 3 is arranged between the lower end of the top positive plate 1 and the upper end of the bottom negative plate 2. The two positive plates 1 and the two negative plates 2 are symmetrically distributed on the upper and lower sides of the capacitor level separator 3.

[0018] The bottom positive plate 1 is fixedly connected with a positive composite ion coating 7 having one end fixedly connected with the capacitor level diaphragm 3, and the top negative plate 2 is fixedly connected with a negative composite ion coating 8 having one end fixedly connected with the capacitor level diaphragm 3. The inner sides of the two positive plates 1 and the negative plate 2 are fixedly connected with nano activated carbon coatings 4. The nano activated carbon coating 4 is composed of a carbon 60 (C60) molecular structure and is a single material layer. The pore diameters between the molecules of the nano activated carbon coating 4 are all between 1.6-2.8 nm, and the inner sides of the two nano activated carbon coatings 4 are fixedly connected with graphene coatings 5. The graphene coatings 5 are fixedly connected with coating aluminum foils 6.

[0019] In the embodiment, the nano activated carbon coating is composed of a carbon 60 (C60) molecular structure, and the pore diameters between the molecules are highly consistent, more than 96% of which are between 1.6-2.8 nm. Therefore, compared with the existing lithium ion battery, the nano activated carbon coating is more suitable for ion shuttling in and out, can accommodate more ions, and thus brings higher energy density.

[0020] Please refer to Figures 1-3 In the embodiment, the coating aluminum foil 6 is composed of an aluminum foil 61, a positive coating 62 and a negative coating 63. The aluminum foil 61 is a carbon-coated aluminum foil. The positive coating 62 is distributed on the upper and lower sides of the top aluminum foil 61. The positive coating 62 is composed of nano activated carbon, polyvinylidene fluoride, N-methyl pyrrolidone, carbon black conductive agent, graphene and positive composite ions. The density of the positive coating 62 is 120 mg·cm -2 ×2. The negative coating 63 is distributed on the upper and lower sides of the bottom aluminum foil 61. The negative coating 63 is composed of nano activated carbon, polyvinylidene fluoride, N-methyl pyrrolidone, carbon black conductive agent, graphene and negative composite ions.

[0021] In the embodiment, the positive coating 62 is composed of nano activated carbon, polyvinylidene fluoride, N-methyl pyrrolidone, carbon black conductive agent, graphene and positive composite ions, and the negative coating 63 is composed of nano activated carbon, polyvinylidene fluoride, N-methyl pyrrolidone, carbon black conductive agent, graphene and negative composite ions. Therefore, the contact resistance of the positive material and the current collector can be effectively reduced, the internal resistance of the battery is reduced, and the rate performance of the battery is improved.

[0022] The working principle of the above embodiment is as follows: Since the whole battery cell adopts the structure of positive electrode, diaphragm and negative electrode, and the composite ion coating is coated on the connection between the positive electrode plate 1 and the negative electrode plate 2 of the battery cell (i.e. the side close to the capacitor level diaphragm 3), and the nano active carbon coating 4 is coated on the side away from the capacitor level diaphragm 3, the nano active carbon coating is composed of carbon 60 (C60) molecular structure, and the pore size consistency between the molecules is high, more than 96% are between 1.6-2.8nm, so compared with the existing lithium ion battery, it is more suitable for ion shuttling in and out, and can accommodate more ions, thereby bringing higher energy density. Since the coating aluminum foil 6 inside the positive electrode plate 1 and the negative electrode plate 2 is composed of aluminum foil 61, positive electrode coating 62 and negative electrode coating 63, the positive electrode coating 62 is composed of nano active carbon, polyvinylidene fluoride, N-methyl pyrrolidone, carbon black conductive agent, graphene and positive electrode composite ions, and the negative electrode coating 63 is composed of nano active carbon, polyvinylidene fluoride, N-methyl pyrrolidone, carbon black conductive agent, graphene and negative electrode composite ions, which can effectively reduce the contact resistance of the positive electrode material and the current collector, thereby reducing the internal resistance of the battery and improving the rate performance of the battery.

[0023] It should be noted that the relational terms herein such as first and second and the like are used only to differentiate one entity or operation from another, and do not necessarily require or imply that any such actual relationship or order exists between or among the entities or operations. Also, the terms "comprising", "including", or any other variant thereof are intended to cover non-exclusive inclusion, so that processes, methods, articles or devices including a series of elements not only include those elements, but also include other elements not explicitly listed or inherent to such processes, methods, articles or devices. Without more limitations, the element defined by the statement "including a" does not exclude the presence of additional identical elements in the process, method, article or device including the element.

[0024] Although embodiments of the present application have been shown and described, it will be understood by those having ordinary skill in the art that various changes, modifications, alternatives and variations can be made thereto without departing from the principles and spirit of the application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A durable battery cell with a dual-carbon structure, comprising two positive electrode plates (1) and two negative electrode plates (2), characterized in that: A capacitor stage diaphragm (3) is provided between the lower end of the top positive electrode plate (1) and the upper end of the bottom negative electrode plate (2). A positive electrode composite ion coating (7) with one end fixedly connected to the capacitor stage separator (3) is fixedly connected to the side of the bottom positive electrode plate (1) near the capacitor stage separator (3). A negative electrode composite ion coating (8) with one end fixedly connected to the capacitor stage separator (3) is fixedly connected to the side of the top negative electrode plate (2) near the capacitor stage separator (3). A nano-activated carbon coating (4) is fixedly connected to the inner side of both positive electrode plates (1) and negative electrode plates (2). A graphene coating (5) is fixedly connected to the inner side of both nano-activated carbon coatings (4). A coated aluminum foil (6) is fixedly connected between each pair of graphene coatings (5).

2. The durable battery cell with a dual-carbon structure according to claim 1, characterized in that: The nano-activated carbon coating (4) is composed of carbon 60 (C60) molecular structure and is a single material layer.

3. A durable battery cell with a dual-carbon structure according to claim 1, characterized in that: The pore size of each molecule in the nano-activated carbon coating (4) is between 1.6-2.8 nm for more than 96% of the molecules. The two positive electrode plates (1) and negative electrode plates (2) are symmetrically distributed on the upper and lower sides of the capacitor stage separator (3).

4. A durable battery cell with a dual-carbon structure according to claim 1, characterized in that: The coated aluminum foil (6) is composed of aluminum foil (61), positive electrode coating (62) and negative electrode coating (63). The positive electrode coating (62) is distributed on the upper and lower sides of the top aluminum foil (61), and the negative electrode coating (63) is distributed on the upper and lower sides of the bottom aluminum foil (61).

5. A durable battery cell with a dual-carbon structure according to claim 4, characterized in that: The positive electrode coating (62) is composed of nano-activated carbon, polyvinylidene fluoride, N-methylpyrrolidone, carbon black conductive agent, graphene and positive electrode composite ions.

6. A durable battery cell with a dual-carbon structure according to claim 4, characterized in that: The density of the positive electrode coating (62) is 120 mg·cm³. -2 ×2, the aluminum foil (61) is a carbon-coated aluminum foil.

7. A durable battery cell with a dual-carbon structure according to claim 4, characterized in that: The negative electrode coating (63) is composed of nano-activated carbon, polyvinylidene fluoride, N-methylpyrrolidone, carbon black conductive agent, graphene and negative electrode composite ions.

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