CN214203915U

CN214203915U - Three-electrode button cell

Info

Publication number: CN214203915U
Application number: CN202023093227.5U
Authority: CN
Inventors: 邵颖; 蒙叶敏; 李津; 张春杰; 黄学杰
Original assignee: Institute Of Industry Technology Guangzhou & Chinese Academy Of Sciences
Current assignee: Institute Of Industry Technology Guangzhou & Chinese Academy Of Sciences; Institute of Industry Technology Guangzhou of CAS
Priority date: 2020-12-21
Filing date: 2020-12-21
Publication date: 2021-09-14
Anticipated expiration: 2030-12-21

Abstract

The utility model relates to a three-electrode button cell, including positive plate, negative pole piece and reference electrode, be equipped with first diaphragm and second diaphragm between positive plate and the negative pole piece respectively, the reference electrode is including the copper wire, and the copper wire is provided with parcel insulating material's insulating segment, and the both ends of copper wire are equipped with electrode end and utmost point ear end respectively, and the electrode end is located between first diaphragm and the second diaphragm. By adopting the technical scheme, the safety is good, and the manufacturing cost of the three-electrode button cell is reduced; meanwhile, the test result is more accurate and is compatible with the existing power-off test equipment.

Description

Three-electrode button cell

Technical Field

The utility model relates to a technical field of battery, concretely relates to three electrode button cell.

Background

Lithium ion batteries have been widely used in various fields since the commercialization in 1990. Through the development of more than 20 years, the performances of the lithium ion battery in all aspects are obviously improved, including energy density, power density, cycle life, safety performance and the like. This is attributed to extensive and intensive theoretical research on lithium ion battery systems in academic and industrial circles.

The electrochemical method is an important means for the research and development of lithium ion battery materials and the performance analysis research, such as cyclic voltammetry, alternating current impedance and the like. The button cell is used as a two-electrode system to carry out electrochemical test, which is simpler and more convenient, but has obvious defects, and the two-electrode system only can embody the integral impedance of the cell, so that the impedance change of a single electrode can not be researched. In addition, when cyclic voltammetry is performed, the voltage value applied to the working electrode is shifted due to the change in the surface impedance value of the electrode.

Based on the above-mentioned shortcomings of the two-electrode button cell, a three-electrode cell system is often required in scientific research or enterprise research and development to improve the accuracy and scientificity of the test. And current three-electrode button cell is including three-electrode button cell, including positive plate, negative pole piece, and the positive plate periphery is equipped with the positive pole casing that plays the guard action, and the negative pole piece periphery is equipped with the negative pole casing that plays the guard action, wherein: a metal lithium ring connected with the copper core is arranged between the positive plate and the negative plate, the metal lithium ring is a reference electrode, and a diaphragm is arranged between the metal lithium ring and the positive plate and between the metal lithium ring and the negative plate.

However, the three-electrode button cell battery adopts a lithium ring as a reference electrode, so that the price is high, the safety is poor, and the experimental result is inaccurate.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art exists, the utility model aims to provide a three-electrode button cell has the advantage of good security, has reduced three-electrode button cell's manufacturing cost, and the more accurate current test equipment of detaining of compatible simultaneously of experimental result.

In order to achieve the above purpose, the utility model provides a following technical scheme:

the utility model provides a three-electrode button cell, including positive plate, negative pole piece and reference electrode, the positive plate with be equipped with first diaphragm and second diaphragm between the negative pole piece respectively, the reference electrode is including the copper wire, the copper wire is provided with the insulating section of parcel insulating material, the both ends of copper wire are equipped with electrode tip and utmost point ear end respectively, the electrode tip is located two sets ofly first diaphragm with between the second diaphragm.

By adopting the technical scheme, after the reference electrode, the positive plate and the negative plate are assembled, the lug of the positive plate is connected with the positive end of the charging and discharging test cabinet, the lug end is connected with the negative end of the charging and discharging test cabinet, and the electrode end is plated with lithium, so that the post-assembly lithium plating of the three-electrode battery is realized, the use of dangerous active lithium is avoided, and the safety risk is reduced; meanwhile, compared with a lithium ring, the copper wire is lower in price, the manufacturing cost of the three-electrode button cell is reduced, the contact area of the copper wire with the positive electrode and the negative electrode is smaller than that of the lithium ring, the original lithium embedding and lithium removing reaction before the positive electrode and the negative electrode cannot be influenced, and therefore the three-electrode test data are more accurate.

The utility model discloses further set up to: and the periphery of the positive plate is provided with a positive shell, and the periphery of the negative plate is provided with a negative shell.

By adopting the technical scheme, the protection effect on the positive plate and the negative plate is achieved, and the stability of the three-electrode button cell is improved.

The utility model discloses further set up to: the positive pole shell with be equipped with shell fragment and first gasket between the positive plate in proper order, the negative pole shell with be equipped with the second gasket between the negative pole piece.

By adopting the technical scheme, the elastic sheets press the positive and negative pole pieces after the positive and negative pole shells are buckled and the covers are closed, so that good interface contact of the positive and negative poles is kept; simultaneously, be equipped with shell fragment and first gasket between anodal casing and positive plate in proper order, avoid the shell fragment direct action to the positive plate through first gasket, and then lead to the positive plate to warp, played the guard action to the positive plate.

The utility model discloses further set up to: one end of the insulating section is located between the first diaphragm and the second diaphragm, and the other end of the insulating section is led out from the side edge between the first diaphragm and the second diaphragm.

By adopting the technical scheme, the copper wire is not easy to contact with the positive and negative pole pieces, and short circuit is not easy to occur in the assembling and testing processes due to the wrapping of the insulating material.

To sum up, the utility model discloses following beneficial effect has:

1. after the reference electrode, the positive plate and the negative plate are assembled, the positive electrode is connected with the positive end of the charging and discharging test cabinet, the pole lug end of the reference electrode is connected with the negative end of the charging and discharging test cabinet, and the electrode end is plated with lithium, so that the post-assembly lithium plating of the three-electrode battery is realized, the use of dangerous active lithium is avoided, and the safety risk is reduced;

2. the electrode end and the electrode lug end are respectively arranged at the two ends of the copper wire, compared with a lithium ring, the price of the copper wire is lower, the manufacturing cost of the three-electrode button cell is reduced, the contact area of the copper wire with the positive electrode and the negative electrode is smaller compared with the lithium ring, the original lithium embedding and lithium removing reactions before the positive electrode and the negative electrode cannot be influenced, and therefore the three-electrode test data are more accurate.

Drawings

Fig. 1 is an exploded view of the present embodiment.

Reference numerals: 1. a positive plate; 2. a negative plate; 31. a first diaphragm; 32. a second diaphragm; 4. a copper wire; 41. an electrode terminal; 42. an insulating section; 43. a lug end; 51. a positive electrode case; 52. a spring plate; 53. a first gasket; 61. a negative electrode case; 62. a second gasket.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

As shown in fig. 1, the utility model discloses a three electrode button cell, including positive plate 1, negative plate 2 and reference electrode, be equipped with first diaphragm 31 and second diaphragm 32 between positive plate 1 and the negative plate 2 respectively, the reference electrode is including copper wire 4, copper wire 4 is provided with parcel insulating material's insulating section 42, insulating material adopts to rubber, the both ends of copper wire 4 extend respectively there are electrode tip 41 and utmost point ear end 43, electrode tip 41 is located between two sets of first diaphragm 31 and the second diaphragm 32, insulating section 42's one end is located between first diaphragm 31 and the second diaphragm 32, insulating section 42's the other end is drawn forth by the side between first diaphragm 31 and the second diaphragm 32.

The periphery of positive plate 1 is equipped with anodal casing 51, and the periphery of negative plate 2 is equipped with negative pole casing 61, and the lock joint each other between anodal casing 51 and the negative pole casing 61 has buckled shell fragment 52 and first gasket 53 between anodal casing 51 and the positive plate 1 in proper order, and the lock joint has second gasket 62 between negative pole casing 61 and the negative plate 2, and first gasket 53 and second gasket 62 both adopt stainless steel material to make.

The working conditions and principles of the embodiment are as follows:

when the three-electrode button cell needs to be assembled, the negative electrode shell 61 is taken out firstly, the second gasket 62 is attached to the negative electrode shell 61, the negative electrode sheet 2 is placed on the second gasket 62, a part of electrolyte is dripped, the diaphragm 3 is placed on the negative electrode sheet 2, a part of electrolyte is dripped, the electrode end 41 is clamped between the two diaphragms 3, a part of electrolyte is dripped, the positive electrode sheet 1, the first gasket 53 and the elastic sheet 52 are sequentially placed, then the positive electrode shell 51 is covered, and the cover is closed and sealed through a hydraulic press.

The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims

1. The utility model provides a three-electrode button cell, including positive plate (1), negative pole piece (2) and reference electrode, positive plate (1) with be equipped with first diaphragm (31) and second diaphragm (32) between negative pole piece (2) respectively, characterized by: the reference electrode comprises a copper wire (4), an insulating section (42) wrapping insulating materials is arranged on the copper wire (4), electrode ends (41) and lug ends (43) are arranged at two ends of the copper wire (4) respectively, and the electrode ends (41) are located between the first diaphragm (31) and the second diaphragm (32).

2. The three-electrode button cell according to claim 1, which is characterized in that: the positive plate (1) is provided with a positive shell (51) at the periphery, and the negative plate (2) is provided with a negative shell (61) at the periphery.

3. The three-electrode button cell according to claim 2, characterized in that: the battery is characterized in that an elastic sheet (52) and a first gasket (53) are sequentially arranged between the positive electrode shell (51) and the positive electrode plate (1), and a second gasket (62) is arranged between the negative electrode shell (61) and the negative electrode plate (2).

4. The three-electrode button cell according to claim 1, which is characterized in that: one end of the insulating section (42) is positioned between the first diaphragm (31) and the second diaphragm (32), and the other end of the insulating section (42) is led out from the side edge between the first diaphragm (31) and the second diaphragm (32).