阅读说明：本技术 电池电容及其制备方法 (Battery capacitor and preparation method thereof ) 是由 张刚 张帆 钱陆明 章晋 周泽宇 施鑫鑫 颜士青 严高飞 王蒙蒙 于 2021-05-26 设计创作，主要内容包括：一种电池电容包括外壳、正极层、负极层及置于正极层与负极层之间的绝缘隔膜。所述正极层包括正极集流体及正极电极材料,所述正极集流体为具有三维通孔的第一金属集流体,所述第一金属集流体为铝材集流体,所述正极电极材料填充于正极集流体的三维通孔内部并附着于其外表面,所述负极层包括负极集流体及负极电极材料,所述负极集流体为具有三维通孔的第二金属集流体,所述第二金属集流体为铜材集流体,所述负极电极材料填充并固定于负极集流体的三维通孔内部并附着于其外表面。本发明还提供了一种电池电容的制备方法。(A battery capacitor comprises a shell, a positive electrode layer, a negative electrode layer and an insulating diaphragm arranged between the positive electrode layer and the negative electrode layer. The positive pole layer comprises a positive pole current collector and a positive pole electrode material, the positive pole current collector is a first metal current collector with three-dimensional through holes, the first metal current collector is an aluminum current collector, the positive pole electrode material is filled in the three-dimensional through holes of the positive pole current collector and attached to the outer surface of the three-dimensional through holes, the negative pole layer comprises a negative pole current collector and a negative pole electrode material, the negative pole current collector is a second metal current collector with three-dimensional through holes, the second metal current collector is a copper material current collector, and the negative pole electrode material is filled in and fixed on the three-dimensional through holes of the negative pole current collector and attached to the outer surface of the three-dimensional through holes. The invention also provides a preparation method of the battery capacitor.)

1. The utility model provides a battery capacitor, includes shell, positive pole layer, negative pole layer and arranges the insulating diaphragm between positive pole layer and the negative pole layer in, its characterized in that, positive pole layer includes anodal mass flow body and anodal electrode material, anodal mass flow body is the first metal mass flow body that has three-dimensional through-hole, first metal mass flow body is the aluminum product mass flow body, anodal electrode material fills in the three-dimensional through-hole of anodal mass flow body inside and attached to its surface, the negative pole layer includes negative pole mass flow body and negative electrode material, the second metal mass flow body of negative pole mass flow body for having three-dimensional through-hole, the second metal mass flow body is the copper product mass flow body, negative electrode material fills and is fixed in the three-dimensional through-hole of negative pole mass flow body inside and attached to its surface.

2. The battery capacitor of claim 1, wherein: the first metal current collector is a foamed aluminum foil, and the second metal current collector is a foamed copper foil.

3. The battery capacitor of claim 1, wherein: the first metal current collector is a corrosive aluminum foil, and the second metal current collector is a corrosive copper foil.

4. The battery capacitor of claim 1, wherein: the first metal current collector is an aluminum mesh, and the second metal current collector is a copper mesh.

5. The battery capacitor of claim 1, wherein: the anode electrode material is formed by mixing an anode active substance, a conductive agent, a binder and a solvent.

6. The battery capacitor of claim 1, wherein: the positive active substance is lithium manganate, lithium cobaltate, ternary material, active carbon or mesoporous carbon fiber.

7. The battery capacitor of claim 1, wherein: the negative electrode material is formed by mixing a negative active material, a conductive agent, a binder and a solvent.

8. The battery capacitor of claim 1, wherein: the negative active substance is graphite, hard carbon, soft carbon or mesocarbon microbeads.

9. A preparation method of a battery capacitor is characterized by comprising the following steps:

providing a positive current collector, wherein the positive current collector is provided with a first metal current collector with a three-dimensional through hole, and the first metal current collector is an aluminum current collector;

providing a negative current collector, wherein the negative current collector is a second metal current collector with a three-dimensional through hole, and the second metal current collector is a copper material current collector;

filling and fixing a positive electrode material in the three-dimensional through hole and the outer surface of the positive current collector to form a positive electrode layer;

filling and fixing the negative electrode material in the three-dimensional through hole of the negative current collector and the outer surface of the three-dimensional through hole to form a negative electrode layer;

fixing an insulating diaphragm between the plurality of positive electrode layers and the plurality of negative electrode layers;

fixing a first conductive foil strip on the positive electrode layer and the first tab;

fixing a second conductive foil strip on the negative electrode layer and the second tab;

providing an aluminum-plastic film with an opening, and placing the positive electrode layer, the insulating diaphragm and the negative electrode layer which are fixed together into the aluminum-plastic film; and

and injecting electrolyte into the aluminum-plastic film and carrying out thermoplastic sealing on the aluminum-plastic film.

10. The method of making a battery capacitor of claim 1, wherein: the first metal current collector is a foamed aluminum foil, a corrosive aluminum foil or an aluminum mesh, and the second metal current collector is a foamed copper foil, a corrosive copper foil or a copper mesh.

Technical Field

The application relates to the technical field of energy storage devices, in particular to a battery capacitor and a preparation method thereof.

Background

Battery capacitors, as a new type of energy storage device appearing in recent years, are increasingly used in electric equipment, such as electric vehicles. At present, the research on the battery capacitance mainly focuses on the matching of positive and negative electrode materials and is used for coping with different application scenes. The conventional battery capacitor has a significant contradiction in practical application, and the power density is required to be sacrificed when high energy density is pursued, and correspondingly, the energy density is required to be sacrificed when high energy density is pursued.

Disclosure of Invention

In view of the above, it is desirable to provide a battery capacitor and a method for manufacturing the same, so that the battery capacitor has both high energy density and high power density.

The utility model provides a battery capacitor, includes shell, positive pole layer, negative pole layer and arranges the insulating diaphragm between positive pole layer and the negative pole layer in, positive pole layer includes anodal mass flow body and anodal electrode material, anodal mass flow body is the first metal mass flow body that has three-dimensional through-hole, first metal mass flow body is the aluminum product mass flow body, anodal electrode material fills in the three-dimensional through-hole of anodal mass flow body inside and adheres to its surface, the negative pole layer includes negative pole mass flow body and negative electrode material, the second metal mass flow body of negative pole mass flow body for having three-dimensional through-hole, the second metal mass flow body is the copper product, negative electrode material fills and is fixed in the three-dimensional through-hole of negative pole mass flow body inside and adheres to its surface.

Further, the first metal current collector is a foamed aluminum foil, and the second metal current collector is a foamed copper foil.

Further, the first metal current collector is a corrosive aluminum foil, and the second metal current collector is a corrosive copper foil.

Further, the first metal current collector is an aluminum mesh, and the second metal current collector is a copper mesh.

Further, the positive electrode material is formed by mixing a positive active material, a conductive agent, a binder and a solvent.

Further, the positive active substance is lithium manganate, lithium cobaltate, a ternary material, active carbon or mesoporous carbon fiber.

Furthermore, the negative electrode material is formed by mixing a negative active material, a conductive agent, a binder and a solvent.

Further, the negative active material is graphite, hard carbon, soft carbon, or mesocarbon microbeads.

A preparation method of a battery capacitor comprises the following steps:

providing a positive current collector, wherein the positive current collector is provided with a first metal current collector with a three-dimensional through hole, and the first metal current collector is an aluminum current collector;

providing a negative current collector, wherein the negative current collector is a second metal current collector with a three-dimensional through hole, and the second metal current collector is a copper material current collector;

filling and fixing a positive electrode material in the three-dimensional through hole and the outer surface of the positive current collector to form a positive electrode layer;

filling and fixing the negative electrode material in the three-dimensional through hole of the negative current collector and the outer surface of the three-dimensional through hole to form a negative electrode layer;

fixing an insulating diaphragm between the plurality of positive electrode layers and the plurality of negative electrode layers;

fixing a first conductive foil strip on the positive electrode layer and the first tab;

fixing a second conductive foil strip on the negative electrode layer and the second tab;

providing an aluminum-plastic film with an opening, and placing the positive electrode layer, the insulating diaphragm and the negative electrode layer which are fixed together into the aluminum-plastic film; and

and injecting electrolyte into the aluminum-plastic film and carrying out thermoplastic sealing on the aluminum-plastic film.

Further, the first metal current collector is a foamed aluminum foil, a corrosive aluminum foil or an aluminum mesh, and the second metal current collector is a foamed copper foil, a corrosive copper foil or a copper mesh.

According to the battery capacitor and the preparation method thereof, the aluminum material current collector and the copper material current collector are respectively used as the positive and negative current collectors, the active substances are attached to the surfaces of the current collectors and are embedded into pores of the current collectors, the loading capacity of the active substances in the positive and negative electrodes is greatly improved, the conductivity of the positive electrode layer and the negative electrode layer is improved, and therefore the energy density and the power density of the battery capacitor are improved.

Drawings

Fig. 1 is a schematic structural diagram of a battery capacitor according to an embodiment of the present disclosure.

Fig. 2 is a flowchart of a method for manufacturing a battery capacitor according to an embodiment of the present disclosure.

Description of the main elements

Battery capacitor	100
		Outer casing	10
Positive electrode layer	20
		Negative electrode layer	30
Insulating diaphragm	40
		Positive current collector	21
Positive electrode material	22
		Negative current collector	31
Negative electrode material	32
		Containing cavity	11

The following detailed description will further illustrate the present application in conjunction with the above-described figures.

Detailed Description

So that the manner in which the above recited objects, features and advantages of embodiments of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments thereof which are illustrated in the appended drawings. In addition, the features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth to provide a thorough understanding of embodiments of the invention, and the described embodiments are merely a subset of embodiments of the invention, rather than a complete embodiment. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative effort belong to the protection scope of the embodiments of the present invention.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which embodiments of the present invention belong. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the embodiments of the invention.

Fig. 1 is a schematic structural diagram of a battery capacitor 100 according to the present application. The battery capacitor 100 includes a case 10, a positive electrode layer 20, a negative electrode layer 30, and an insulating separator 40 interposed between the positive electrode layer 20 and the negative electrode layer 30. The positive electrode layer 20, the negative electrode layer 30, and the insulating separator 40 are fixed in the case 10.

The positive electrode layer 20 includes a positive electrode collector 21 and a positive electrode material 22. The positive current collector 21 is a first metal current collector with a three-dimensional through hole, and the first metal current collector is an aluminum current collector. In one embodiment, the first metallic current collector is a foamed aluminum foil. In other embodiments, the first metallic current collector is a corrosive aluminum foil or mesh. The positive electrode material 22 is filled in the three-dimensional through hole of the positive electrode current collector 21 and attached to the outer surface thereof. The positive electrode material 22 is a first high viscosity paste including a positive electrode active material. The positive active substance can be lithium manganate, lithium cobaltate, ternary materials (NCM523, NCM811 and the like), activated carbon, mesoporous carbon fiber and the like, and the first high-viscosity slurry is formed by mixing the positive active substance, a conductive agent, a binder and a solvent. The first high-viscosity slurry is coated inside the three-dimensional through hole of the first metal current collector and attached to the outer surface of the three-dimensional through hole in a coating mode.

The negative electrode layer 30 includes a negative electrode collector 31 and a negative electrode material 32. The negative current collector 31 is a second metal current collector with a three-dimensional through hole, and the second metal current collector is a copper current collector. In one embodiment, the second metallic current collector is a copper foam foil. In other embodiments, the second metallic current collector is a corrosive copper foil or mesh. The negative electrode material 32 is filled and fixed inside the three-dimensional through-hole of the negative current collector 31 and attached to the outer surface thereof. The negative electrode material 32 is a second high viscosity slurry including a negative active material, which may be graphite, hard carbon, soft carbon, mesocarbon microbeads, or the like, and the second high viscosity slurry is formed by mixing a negative active material, a conductive agent, a binder, and a solvent. And the second high-viscosity slurry is coated inside the three-dimensional through hole of the second metal current collector in a coating mode and is attached to the outer surface of the three-dimensional through hole.

A first foil guide strip (not shown) is fixed on each positive electrode layer 20, and the first foil guide strip is fixed with a first tab. In one embodiment, the positive electrode layer 20 is welded to the first foil guide strip, which is welded to the first tab, by cold pressure welding.

Each of the negative electrode layers 30 is fixed with a second foil-conducting strip (not shown), and the second foil-conducting strip is fixed with a second tab. In one embodiment, the negative electrode layer 30 is welded to the second foil guide strip, which is welded to the second tab, by cold pressure welding.

The battery capacitor 100 includes a plurality of positive electrode layers 20 and a plurality of negative electrode layers 30 arranged at intervals, and one insulating membrane 40 is fixedly arranged between each positive electrode layer 20 and each negative electrode layer 30, so that the positive electrode layer 20 and the negative electrode layer 30 are separated by the insulating membrane 40.

The housing 10 forms an accommodating cavity 11, the positive electrode layer 20, the insulating diaphragm 40 and the negative electrode layer 30 which are fixed together are placed in the accommodating cavity 11, and the accommodating cavity 11 is also used for accommodating electrolyte. In an embodiment, the housing 10 is formed by sealing an aluminum-plastic film forming an opening, specifically, after the electrolyte, the positive electrode layer 20, the insulating diaphragm 40, and the negative electrode layer 30 fixed together are placed in the aluminum-plastic film having the opening, the aluminum-plastic film is sealed by heat molding to form the accommodating cavity 11, so that the electrolyte, the positive electrode layer 20, the insulating diaphragm 40, and the negative electrode layer 30 fixed together are sealed in the accommodating cavity 11.

Referring to fig. 2, the present invention further provides a method for manufacturing the battery capacitor 100, which is as follows.

Step S21: providing a positive current collector 21, wherein the positive current collector 21 is provided with a first metal current collector with three-dimensional through holes, and the first metal current collector is an aluminum material current collector. In one embodiment, the first metallic current collector is a foamed aluminum foil. In other embodiments, the first metallic current collector is a corrosive aluminum foil or mesh.

Step S22: providing a negative current collector 31, wherein the negative current collector 31 is a second metal current collector with a three-dimensional through hole, and the second metal current collector is a copper current collector. In one embodiment, the second metallic current collector is a copper foam foil. In other embodiments, the second metallic current collector is a corrosive copper foil or mesh.

Step S23: the positive electrode material 22 is filled and fixed inside the three-dimensional through-hole of the positive electrode collector 21 and the outer surface thereof to form the positive electrode layer 20. The positive electrode current collector 21 is a first high viscosity paste including a positive electrode active material. The positive active substance can be lithium manganate, lithium cobaltate, ternary materials (NCM523, NCM811 and the like), activated carbon, mesoporous carbon fiber and the like, and the first high-viscosity slurry is formed by mixing the positive active substance, a conductive agent, a binder and a solvent. The first high-viscosity slurry is coated inside the three-dimensional through hole of the first metal current collector and attached to the outer surface of the three-dimensional through hole in a coating mode.

Step S24: the negative electrode material 32 is filled and fixed inside the three-dimensional through-hole of the negative current collector 31 and the outer surface thereof to form the negative electrode layer 30. The negative current collector 31 is a second high viscosity slurry including a negative active material, wherein the negative active material may be graphite, hard carbon, soft carbon, mesocarbon microbeads or the like, and the second high viscosity slurry is formed by mixing a negative active material, a conductive agent, a binder and a solvent. And the second high-viscosity slurry is coated inside the three-dimensional through hole of the second metal current collector in a coating mode and is attached to the outer surface of the three-dimensional through hole.

Step S25: an insulating separator 40 is fixed between the positive electrode layer 20 and the negative electrode layer 30.

Step S26: a first conductive foil strip is fixed to the positive electrode layer 20 and the first tab. In one embodiment, the positive electrode layer 20 is welded to the first foil guide strip, which is welded to the first tab, by cold pressure welding.

Step S27: a second conductive foil strip is secured to the negative electrode layer 30 and the second tab. In one embodiment, the negative electrode layer 30 is welded to the second foil guide strip, which is welded to the second tab, by cold pressure welding.

Step S28: an aluminum plastic film having an opening is provided and the positive electrode layer 20, the insulating separator 40, and the negative electrode layer 30 fixed together are put into the aluminum plastic film.

Step S29: and injecting electrolyte into the aluminum-plastic film and carrying out thermoplastic sealing on the aluminum-plastic film.

The battery capacitor 100 and the preparation method thereof respectively adopt the aluminum material current collector and the copper material current collector as the positive and negative current collectors 31, and the active substances are not only attached to the surfaces of the current collectors, but also embedded into the pores of the current collectors, so that the loading capacity of the active substances in the positive and negative electrodes is greatly improved, the conductivity of the positive electrode layer 20 and the negative electrode layer 30 is improved, and the energy density and the power density of the battery capacitor 100 are improved.

It should be understood by those skilled in the art that the above embodiments are only for illustrating the present application and are not to be taken as limiting the present application, and that suitable changes and modifications of the above embodiments are within the scope of the disclosure claimed in the present application as long as they are within the spirit and scope of the present application.