CN210606980U

CN210606980U - Super capacitor is with electric core structure of accelerating electrolyte infiltration

Info

Publication number: CN210606980U
Application number: CN201922089168.5U
Authority: CN
Inventors: 高飞; 常亮; 郭艳荣; 孙翠平; 刘璐; 王颖
Original assignee: Jinzhou Kam Power Co ltd
Current assignee: Jinzhou Kam Power Co ltd
Priority date: 2019-11-28
Filing date: 2019-11-28
Publication date: 2020-05-22
Anticipated expiration: 2029-11-28

Abstract

A super capacitor is with electric core structure of accelerating electrolyte infiltration belongs to electrochemistry energy memory technical field. The super capacitor is with electric core structure of accelerating electrolyte infiltration, include negative electrode, diaphragm paper, positive electrode and the diaphragm paper that from interior to exterior sets gradually, negative electrode and positive electrode are equallyd divide and are provided with horizontal drainage groove and a plurality of vertical drainage groove respectively, and horizontal drainage groove sets up at negative electrode and positive electrode along length direction's intermediate position, vertical drainage groove with horizontal drainage groove sets up perpendicularly, and horizontal drainage groove and vertical drainage groove are all processed on negative electrode and positive electrode through the mode of mechanical decarbonization, electrode-to-electrode scribble or laser decarbonization and are made. The electric core structure for accelerating the electrolyte infiltration for the super capacitor improves the liquid injection speed of the electric core and reduces the production cost on the premise of not damaging the electrode structure and not influencing the product performance.

Description

Super capacitor is with electric core structure of accelerating electrolyte infiltration

Technical Field

The utility model relates to an electrochemistry energy memory technical field, in particular to super capacitor is with electric core structure of accelerating electrolyte infiltration.

Background

Super capacitor (double electric layer capacitor) is a high energy electric energy storage device developed in recent years, has the advantages of high power density, long cycle life, rapid charging and discharging, no pollution to environment and the like, and is widely applied to backup power sources of motor regulators, sensors and microcomputer memories. With the development of the energy storage field, higher requirements are also put forward on the super capacitor: higher energy density, higher power density and better safety performance.

The electrode is the core component of an electrochemical energy storage device such as a super capacitor, and the currently common electrode structure is that an aluminum foil is coated with electrode materials on one side or two sides, and then a positive electrode, a negative electrode and a diaphragm are sequentially wound to form a multilayer structure, namely a battery core structure of a positive electrode/diaphragm/a negative electrode/diaphragm. In order to achieve a high energy density and a stable product structure, the cell is generally wound under high tension to form a cylindrical shape. The electrolyte climbs on two end faces of the electric core through the electrodes and the diaphragm paper, and the infiltration speed is slow, so that the liquid injection process becomes the bottleneck of the efficiency of the whole product production. In addition, the wetting efficiency of the electrolyte also has a certain influence on the energy density and the power density of the electrochemical energy storage device. The infiltration speed of the electrolyte depends on the infiltration path of the electrolyte: in the axial direction of the cylindrical electrode core, the electrolyte is infiltrated along the direction parallel to the axial direction of the electrode core between the anode/diaphragm/cathode/diaphragm layers; in the diameter direction of the cylindrical electrode core, the diaphragm is of a porous structure, and the electrode active substance has high adsorbability, so in the liquid injection process, the electrode active substance and the diaphragm are not the main obstacle of electrolyte infiltration, and the electrode, the diaphragm, the electrode and the layers between the electrode and the layers have large tension and no gap, so that the electrolyte cannot infiltrate to the middle position of the electrode core to be the main obstacle.

SUMMERY OF THE UTILITY MODEL

In order to solve the electrolyte infiltration speed that prior art exists slow, influence technical problem such as production efficiency, the utility model provides a super capacitor is with electric core structure of accelerating electrolyte infiltration, under the prerequisite that does not destroy electrode structure and do not influence the product performance, improve electric core and annotate liquid speed, reduction in production cost.

In order to realize the purpose, the technical scheme of the utility model is that:

a super capacitor is with accelerating electric core structure that the electrolyte soaks, include negative electrode, diaphragm paper, positive electrode and diaphragm paper set up sequentially from inside to outside;

the negative electrode and the positive electrode are respectively provided with a transverse drainage groove and a plurality of longitudinal drainage grooves.

The transverse drainage grooves are arranged at the middle positions of the negative electrode and the positive electrode in the length direction, and penetrate through the surfaces of the negative electrode and the positive electrode.

The longitudinal drainage grooves are perpendicular to the transverse drainage grooves, the longitudinal drainage grooves also penetrate through the surfaces of the negative electrode and the positive electrode, and the transverse drainage grooves and the longitudinal drainage grooves are combined to ensure that electrolyte can fully infiltrate into the battery core.

The transverse drainage groove and the longitudinal drainage groove are processed on the negative electrode and the positive electrode in a mechanical decarbonization mode, an inter-electrode coating mode or a laser decarbonization mode.

The width of the transverse drainage groove and the width of the longitudinal drainage groove are both 0.2 mm-1.0 mm.

The distance between two adjacent longitudinal drainage grooves is 30-150 mm.

The utility model has the advantages that:

1) on the premise of not damaging the electrode structure and not influencing the product performance, the electrolyte injection speed of the battery core is improved, and the production cost is reduced;

2) the electrolyte infiltrates the battery cell from two ends of the longitudinal drainage groove, and quickly infiltrates into the battery cell through the transverse drainage groove and the longitudinal drainage groove, so that the electrolyte-infusing time of a subsequent electrolyte-infusing process is greatly reduced;

3) the transverse drainage grooves and the longitudinal drainage grooves are processed and manufactured on the negative electrode and the positive electrode in a mode of mechanical decarbonization, inter-electrode coating or laser decarbonization, and the mechanical strength of the electrodes can be guaranteed not to be influenced by the drainage grooves and reduced while the electrolyte can be guaranteed to fully infiltrate into the battery core.

Additional features and advantages of the invention will be set forth in part in the detailed description which follows.

Drawings

Fig. 1 is a schematic structural diagram of a cell structure for accelerating electrolyte infiltration for a super capacitor provided in an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a positive electrode provided in an embodiment of the present invention.

Reference numerals in the drawings of the specification include:

1-positive electrode, 2-negative electrode, 3-diaphragm paper, 4-transverse drainage groove and 5-longitudinal drainage groove.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "vertical", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

In the description of the present invention, unless otherwise specified and limited, it is to be noted that the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, mechanically or electrically connected, or may be connected between two elements through an intermediate medium, or may be directly connected or indirectly connected, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.

In order to solve the problem that prior art exists, as shown in fig. 1 to fig. 2, the embodiment of the utility model provides a super capacitor is with electric core structure of accelerating the infiltration of electrolyte, under the prerequisite that does not destroy electrode structure and does not influence the product performance, improves electric core and annotates liquid speed, reduction in production cost.

As shown in fig. 1, a cell structure for accelerating electrolyte infiltration for a supercapacitor comprises a negative electrode 2, a separator paper 3, a positive electrode 1 and a separator paper 3, which are sequentially arranged from inside to outside;

the negative electrode 2 and the positive electrode 1 are equally divided into a transverse drainage groove 4 and a plurality of longitudinal drainage grooves 5, the transverse drainage groove 4 and the longitudinal drainage grooves 5 are processed and manufactured on the negative electrode 2 and the positive electrode 1 in a mode of mechanically removing carbon, coating between electrodes or removing carbon by laser, and when the electrolyte is ensured to be capable of fully infiltrating the battery core, the mechanical strength of the electrodes can be ensured to be not influenced by the drainage grooves and reduced.

As shown in fig. 2, the positive electrode 1 and the negative electrode 2 and the drainage grooves on the positive electrode 2 and the negative electrode 2 have the same structure, the transverse drainage groove 4 is arranged at the middle position of the negative electrode 2 and the positive electrode 1 along the length direction, and the transverse drainage groove 4 penetrates through the surfaces of the negative electrode 2 and the positive electrode 1; vertical drainage groove 5 sets up with horizontal drainage groove 4 is perpendicular to vertical drainage groove 5 also link up the surface of negative electrode 2 and positive electrode 1, and the vertical drainage groove of a plurality of 5 distributes on the surface of positive electrode 1 and negative electrode 2, and horizontal drainage groove 4 combines with the vertical drainage groove of a plurality of 5 to guarantee that electrolyte can fully soak inside the electric core. When the battery core structure is actually wound, the longitudinal drainage groove 5 and the transverse drainage groove 4 of the negative electrode 2 are both positioned on the surface of one side of the negative electrode 2, which is far away from the positive electrode 1, and the longitudinal drainage groove 5 and the transverse drainage groove 4 of the positive electrode 1 are both positioned on the surface of one side of the positive electrode 1, which is close to the negative electrode 2. The width of the transverse drainage groove 4 and the width of the longitudinal drainage groove 5 are both 0.2 mm-1.0 mm, namely B in 2. The distance between two adjacent longitudinal drainage grooves 5 is 30mm to 150mm, i.e. a in fig. 2, but of course, the distance between two adjacent longitudinal drainage grooves 5 can also be obtained by calculation, for example, a is L/L1, where L is the electrode length, L1 is the electrolyte electrode diffusion distance, and a takes a positive integer.

Example 1

The method is characterized in that electrodes with the thickness of 0.255mm, the length of 1500mm and the width of 80mm are adopted, the electrodes are respectively taken as a positive electrode 1 and a negative electrode 2 of the super capacitor, the electrodes and diaphragm paper 3 with the thickness of 0.03mm are wound into a multilayer structure, the winding tension is 0.25Mpa, the diameter of a battery core is 33.5mm, the model of the diaphragm paper 3 is T2B4530 of NKK company, and longitudinal drainage grooves 5 and transverse drainage grooves 4 are not arranged.

The battery core of the embodiment is subjected to a process method of first vacuumizing and then injecting liquid, and liquid injection time test and performance test are performed, wherein the vacuum degree is 100 pa.

Example 2

The method comprises the steps of adopting electrodes with the thickness of 0.255mm, the length of 1500mm and the width of 80mm, taking the electrodes as a positive electrode 1 and a negative electrode 2 of a super capacitor respectively, and winding the electrodes and a diaphragm paper 3 with the thickness of 0.03mm into a multilayer structure, wherein the winding tension is 0.25Mpa, the diameter of a battery core is 33.5mm, the model of the diaphragm paper 3 is T2B4530 of NKK company, and the diffusion distance of an electrolyte electrode is 17 mm.

The widths of the longitudinal drainage grooves 5 and the transverse drainage grooves 4 are both 0.2mm, and the distance A between two adjacent longitudinal drainage grooves 5 in the length direction of the electrode is 88mm when the width A/L1 is 1500/17 is 88.2 in the length direction of the electrode.

Example 3

The widths of the longitudinal drainage grooves 5 and the transverse drainage grooves 4 are both 1.0mm, and the distance A between two adjacent longitudinal drainage grooves 5 in the length direction of the electrode is 88mm when the width A/L1 is 1500/17 is 88.2 in the length direction of the electrode.

The results of comparison of average injection time and capacity of examples 1 to 3 are shown in table 1, and it can be seen from table 1 that the injection time of the cell structures with the longitudinal drainage grooves 5 and the transverse drainage grooves 4 added in examples 2 and 3 is significantly reduced, and the capacity test of the supercapacitors composed of the cell structures in examples 2 and 3 is significantly better than that of the supercapacitors using the cell in example 1, compared with the cells manufactured by the electrodes without the longitudinal drainage grooves 5 and the transverse drainage grooves 4 added in example 1.

Table 1 average injection time and volume comparison results for examples 1-3

	Example 1	Example 2	Example 3
				Number of samples	10	10	10
Average injection time/min	65	34	25
				capacity/F	820	825	837

The working principle of the cell structure for accelerating the electrolyte infiltration for the super capacitor is as follows:

as shown in fig. 2, after the negative electrode 2, the diaphragm paper 3, the positive electrode 1 and the diaphragm paper 3 are wound into a cell structure, since the transverse drainage groove 4 and the longitudinal drainage groove 5 are added in the transverse and longitudinal directions of the electrode, C represents the electrolyte infiltration direction, and the electrolyte begins to infiltrate the cell from the two ends of the longitudinal drainage groove 5, the electrolyte can be quickly infiltrated into the cell, so that the electrolyte injection time of the subsequent electrolyte injection process is greatly reduced.

In the drawings of the disclosed embodiments of the present invention, only the structures related to the disclosed embodiments are referred to, and other structures can refer to general designs.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A super capacitor is with accelerating electric core structure that the electrolyte soaks, wherein include negative electrode, diaphragm paper, positive electrode and diaphragm paper set up sequentially from inside to outside;

2. The cell structure for accelerating electrolyte infiltration for the supercapacitor according to claim 1, wherein the transverse drainage grooves are formed at the middle positions of the negative electrode and the positive electrode in the length direction, and penetrate through the surfaces of the negative electrode and the positive electrode.

3. The cell structure for accelerating electrolyte infiltration for the supercapacitor according to claim 2, wherein the longitudinal drainage grooves are perpendicular to the transverse drainage grooves, and the longitudinal drainage grooves also penetrate through the surfaces of the negative electrode and the positive electrode.

4. The cell structure for accelerating the electrolyte infiltration for the supercapacitor according to claim 1, wherein the transverse drainage groove and the longitudinal drainage groove are both manufactured by processing on a negative electrode and a positive electrode in a mechanical decarbonization mode, an inter-electrode coating mode or a laser decarbonization mode.

5. The cell structure for accelerating electrolyte infiltration for the supercapacitor according to claim 1, wherein the widths of the transverse drainage grooves and the longitudinal drainage grooves are both 0.2mm to 1.0 mm.

6. The cell structure for accelerating electrolyte infiltration for the supercapacitor according to claim 1, wherein the distance between two adjacent longitudinal drainage grooves is 30mm to 150 mm.