Super capacitor with inner and outer tab cell

Abstract

The utility model discloses a super capacitor containing an inner and outer tab battery cell. The super capacitor comprises an anode battery cell outer tab, an anode battery cell inner tab, a cathode battery cell, an anode battery cell, a cathode battery cell inner tab and a cathode battery cell outer tab, one end of the anode cell inner tab is in spot welding connection with the top end of the anode cell, the other end of the anode cell inner tab is in spot welding connection with the anode cell outer tab, one end of the cathode cell inner tab is in spot welding connection with the top end of the cathode cell, and the other end of the cathode cell inner tab is in spot welding connection with the cathode cell outer tab. And forming the soft package super capacitor by the positive electrode cell and the negative electrode cell of the inner tab and the outer tab under the vacuum packaging action of the aluminum plastic film. The electric core with the inner and outer tabs provided by the utility model not only ensures efficient electron transmission among a plurality of electric cores of the same type in the super capacitor, but also remarkably reduces the overall mass of the super capacitor, and provides structural reference for the super capacitor with high energy density.

Description

Technical Field

[0001] The utility model relates to a supercapacitor containing an inner and outer tab battery core, belonging to the technical field of batteries and supercapacitors. Background Art

[0002] Supercapacitors are a new type of energy storage device with advantages such as high power density, fast charge and discharge, and long cycle life. They have broad application prospects in electric vehicles, wind power generation, clean energy storage, etc. However, excellent energy density usually corresponds to a larger volume and mass of the device, limiting its application in portable devices and microelectronics. Therefore, lightweight and high energy storage density supercapacitors are still a current research hotspot.

[0003] In the field of soft-pack battery technology, the outer tabs of the positive and negative electrodes are usually used as leads for external connection to provide high conductivity, and the inner tabs are used as intermediates to connect the battery cell to the outer tabs, which are used to conduct external power or current transmission between the device and the battery cell. In the existing technology, soft-pack supercapacitors are mainly formed by welding a single tab on a pole piece. When the number of cells is too large, the thickness of the tab gradually increases, resulting in unstable connection between the tab and the pole piece, unstable current transmission, and when subjected to external force, it is very easy for the weld to be damaged and deformed, resulting in device failure. At the same time, the continuously accumulated tab mass will also lead to a decrease in the energy density of the device. Therefore, by rationally combining and designing the inner and outer tabs of the supercapacitor cell structure, while ensuring high electronic conduction, excellent lightweight can be achieved, which is expected to achieve further growth in the energy density of supercapacitors. Utility Model Content

[0004] In view of the above problems, the utility model aims to provide a supercapacitor having a lightweight inner pole ear and a highly conductive outer pole ear battery cell, and to provide guidance for the design of lightweight and high energy storage density supercapacitors through the lightweight design of the battery cell structure.

[0005] In order to achieve the above-mentioned utility model purpose, the utility model adopts the following technical solutions:

[0006] A supercapacitor containing an inner and outer tab battery cell, characterized in that it comprises a positive battery cell outer tab, a positive battery cell inner tab, a negative battery cell, a positive battery cell, a negative battery cell inner tab and a negative battery cell outer tab;

[0007] One end of the inner pole ear of the positive battery cell is spot-welded to the top of the positive battery cell, and the other end is spot-welded to the outer pole ear of the positive battery cell. One end of the inner pole ear of the negative battery cell is spot-welded to the top of the negative battery cell, and the other end is spot-welded to the outer pole ear of the negative battery cell. The positive battery cell and the negative battery cell with the inner and outer pole ears are vacuum-packaged with an aluminum-plastic film to form a soft-pack supercapacitor.

[0008] Further technology of the utility model:

[0009] Preferably, the negative electrode cell and the positive electrode cell are made of any one of graphene, activated carbon, carbon fiber materials and composite materials thereof;

[0010] Preferably, the lightweight inner tab is one of copper foil, aluminum foil and nickel foil, with a thickness of 20 μm to 50 μm and a density of 5-10 g / cm 3 .

[0011] Preferably, the highly conductive outer tab is one of a nickel-plated steel strip and a copper-plated steel strip, with a thickness of 100 μm and a density of 5-10 g / cm 3 .

[0012] Preferably, the positive electrode cells and the negative electrode cells are each provided with multiple sheets, the positive electrode cells and the negative electrode cells are arranged alternately, and adjacent positive electrode cells and negative electrode cells are separated by a diaphragm.

[0013] Preferably, a positive electrode cell outer electrode ear is placed between the two positive electrode cell inner electrode ears and are spot-welded to connect them, and a negative electrode cell outer electrode ear is placed between the two negative electrode cell inner electrode ears and are spot-welded to connect them.

[0014] The beneficial effects of the utility model are:

[0015] (1) The battery cell is connected by a lightweight inner tab and a highly conductive outer tab. The inner tab of the battery cell can realize simple interconnection of multiple battery cells and reduce the overall mass of the device. The outer tab provides ultra-high conductivity when used as a lead.

[0016] (2) The battery cell with internal and external tabs provided by the utility model not only ensures efficient transmission of electrons between multiple battery cells of the same type in the supercapacitor, but also significantly reduces the overall mass of the supercapacitor, providing a structural reference for high energy density supercapacitors. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 It is a schematic diagram of the front view structure of a soft-pack supercapacitor assembled with inner and outer tab cells;

[0019] Figure 2 This is a schematic diagram of the top view of the structure of a soft-pack supercapacitor assembled with internal and external tab cells.

[0020] In the attached figure: 1. outer ear of positive battery cell; 2. inner ear of positive battery cell; 3. negative battery cell; 4. separator; 5. positive battery cell; 6. inner ear of negative battery cell; 7. outer ear of negative battery cell; 8. aluminum-plastic film. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be further described in detail below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model but not all. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0022] Graphene is selected as the active material for the positive and negative electrode cells for assembly; the lightweight inner tab is 10μm and the density is 8.96g / cm 3 Commercial copper foil; high conductive outer tab is 100μm, density is 7.85g / cm 3 The nickel-plated steel strip; the connection method between the inner pole ear and the current collector, and the inner pole ear and the outer pole ear is spot welding.

[0023] like Figure 1 , 2 The structure diagram of the soft-pack supercapacitor prepared in this embodiment is shown, which is characterized in that: the combination of positive and negative battery cells consists of a positive battery cell outer pole ear 1; a positive battery cell inner pole ear 2; a negative battery cell 3; a diaphragm 4; a positive battery cell 5; a negative battery cell inner pole ear 6; and a negative battery cell outer pole ear 7; the positive battery cell inner pole ear 2 is spot-welded to the top of the positive battery cell 5, the negative battery cell inner pole ear 6 is spot-welded to the top of the negative battery cell 3, and the positive battery cell 5 and the negative battery cell 3 are separated by a diaphragm 4; a positive battery cell outer pole ear 1 is placed between two positive battery cell inner pole ears 2 and spot-welded, and a negative battery cell outer pole ear 7 is placed between two negative battery cell inner pole ears 6 and spot-welded; and the two sides of the aluminum-plastic film 8 are sealed by a heat sealer. After injecting electrolyte into the supercapacitor, the upper opening is vacuum-sealed to complete the production of the soft-pack supercapacitor.

[0024] The inner tabs of the battery cell are used to interconnect multiple battery cells to reduce mass, and the outer tabs are mainly used as leads to provide high conductivity. The inner tabs are welded to the positive and negative battery cells respectively, effectively increasing the contact area with the battery cell and obtaining high conductivity; the outer tabs are welded to the inner tabs of multiple battery cells to obtain the ability to charge and discharge stably under high current.

[0025] The battery cell with inner and outer tabs provided by the utility model not only ensures efficient transmission of electrons between multiple battery cells of the same type in the supercapacitor, but also significantly reduces the overall mass of the supercapacitor, providing a structural reference for supercapacitors with high energy density.

[0026] The above contents are merely examples and explanations of the structure of the utility model. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the utility model or exceed the scope defined in the claims, they should all fall within the protection scope of the utility model.

Claims

1. A supercapacitor containing an inner and outer tab battery cell, characterized in that: Including positive battery cell outer pole ear, positive battery cell inner pole ear, negative battery cell, positive battery cell, negative battery cell inner pole ear and negative battery cell outer pole ear; One end of the inner pole ear of the positive battery cell is spot-welded to the top of the positive battery cell, and the other end is spot-welded to the outer pole ear of the positive battery cell. One end of the inner pole ear of the negative battery cell is spot-welded to the top of the negative battery cell, and the other end is spot-welded to the outer pole ear of the negative battery cell. The positive battery cell and the negative battery cell with inner and outer pole ears are vacuum-packaged with an aluminum-plastic film to form a soft-pack supercapacitor.

2. A supercapacitor comprising an inner and outer tab battery cell according to claim 1, characterized in that: The thickness of the positive electrode core inner tab and the negative electrode core inner tab is 1 μm to 100 μm, and the density is 1-10 g / cm 3 .

3. A supercapacitor comprising an inner and outer tab battery cell according to claim 1, characterized in that: The thickness of the positive electrode core outer pole ear and the negative electrode core outer pole ear is 100 μm to 1000 μm, and the density is 5-15 g / cm 3 .

4. A supercapacitor comprising an inner and outer tab battery cell according to claim 1, characterized in that: The positive electrode cells and the negative electrode cells are both provided with multiple sheets, the positive electrode cells and the negative electrode cells are arranged alternately, and the adjacent positive electrode cells and negative electrode cells are separated by a diaphragm.

5. A supercapacitor comprising an inner and outer tab battery cell according to claim 4, characterized in that: A positive battery cell outer pole ear is placed between the two positive battery cell inner pole ears and connected by spot welding, and a negative battery cell outer pole ear is placed between the two negative battery cell inner pole ears and connected by spot welding.

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