CN213366678U

CN213366678U - Button cell

Info

Publication number: CN213366678U
Application number: CN202022205861.7U
Authority: CN
Inventors: 吕焱; 周子龙; 刘园园; 许国干; 任瑜
Original assignee: Tianmu Lake Institute of Advanced Energy Storage Technologies Co Ltd
Current assignee: Tianmu Lake Institute of Advanced Energy Storage Technologies Co Ltd
Priority date: 2020-09-30
Filing date: 2020-09-30
Publication date: 2021-06-04
Anticipated expiration: 2030-09-30

Abstract

The utility model provides a novel button cell, which comprises a negative electrode cover, a positive electrode shell, a sealing ring, a positive electrode, a diaphragm, a negative electrode and electrolyte, wherein the sealing ring is hermetically connected with the negative electrode cover and the positive electrode shell and enables the negative electrode cover and the positive electrode shell to form a sealed cavity, and the positive electrode, the diaphragm, the negative electrode and the electrolyte are arranged in the sealed cavity; the positive pole comprises a positive pole shell, a boss is arranged on the outer side of the positive pole shell, a groove is formed in the boss, a positive pole piece is arranged in the groove, and the positive pole piece is connected with the positive pole. The positive polar cover of convex battery guaranteed the reliability of the inside contact nature of battery sheet, reduced uncontrollable factor, the boss has realized the fixed to the pole piece, has reduced the possibility of short circuit, has improved the stability of battery performance and the uniformity of discharge capacity.

Description

Button cell

Technical Field

The utility model belongs to the battery field especially relates to a novel button cell.

Background

With the increasing development of electronic products, button cells are widely used in various miniature electronic products due to their lightness and smallness, and are mainly used as backup power sources for various electronic products, such as computer motherboards, electronic watches, electronic dictionaries, electronic scales, memory cards, remote controllers, CPC cards, electronic display screens, and the like, and the requirements of people on button cells are increasing. Button cells are not only portable, but also require ultra-high capacity and service life, and therefore new button cells are developed to meet market demands. The existing button cell comprises a positive electrode shell, a negative electrode cover, and an electric core and electrolyte which are arranged in a sealing cavity formed between the positive electrode shell and the negative electrode cover, wherein the electric core comprises a positive electrode, a diaphragm, a negative electrode and the like, and the positive electrode, the diaphragm and the negative electrode are sequentially stacked to form the electric core. The situations of electric core movement, liquid leakage and the like can occur in the packaging process and the use process of the battery of the positive shell and the negative cover, and the service life is influenced. The bottom surface of the positive cover of the existing button cell adopts an integral plane structure, the bottom surface is the integral plane positive cover structure, or the structure is similar to the convex-concave surface of the positive shell, but the technical route is troublesome, the change is more, the simple electricity-buckling positive shell used for laboratory testing is simply transformed less, and the simple electricity-buckling positive shell is not suitable for the use of the simple electricity-buckling positive shell at the laboratory level.

The existing button cell has the following defects:

1. in the process of manufacturing the battery, the position of the pole piece is easy to slide and cannot be fixed, so that the short circuit of the positive pole and the negative pole is easy to cause.

2. The internal contact failure of the battery is easily caused, and the discharge consistency of the battery is poor.

3. The design of the convex-concave surface of the cathode shell is troublesome in technical route, more parts are changed, and the height of the convex-concave surface is not mentioned.

Disclosure of Invention

In view of this, the utility model aims at providing a novel button cell to solve the easy slip of pole piece position, it is fixed to get the method, and the inside easy contact of battery is bad, and the circuit is complicated, the problem of easy short circuit.

In order to achieve the above purpose, the technical scheme of the utility model is realized like this:

a novel button cell comprises a negative electrode cover, a positive electrode shell, a sealing ring, a positive electrode, a diaphragm, a negative electrode and electrolyte, wherein the sealing ring is connected with the negative electrode cover and the positive electrode shell in a sealing manner and enables the negative electrode cover and the positive electrode shell to form a sealing cavity; the outer side of the positive electrode shell is provided with a boss, a groove is formed in the boss, and a positive plate is arranged in the groove. The convex battery positive cover ensures good contact property inside the battery pole piece; the convex battery positive cover ensures the reliability of the internal contact of the battery pole piece, reduces the uncontrollable factors, realizes the fixation of the pole piece by the lug boss, reduces the possibility of short circuit, and improves the stability of the battery performance and the consistency of the discharge capacity.

Furthermore, the positive plate is tightly abutted to the positive shell, and the size of the groove is matched with that of the positive plate.

Further, the positive plate is concentric with the positive shell.

Further, the height of the boss is 2 μm to 500 μm. The pole piece is easy to shift when the height of the lug boss is too low, and the transmission of positive and negative lithium ions is blocked when the height of the lug boss is too high.

Further, the diameter of the boss is 2mm-30 mm.

Furthermore, the material of the positive electrode shell is one of stainless steel, aluminum-plated stainless steel or gold-plated stainless steel.

Further, the thickness of the positive electrode shell is 0.5mm-10 mm.

Compared with the prior art, a novel button cell battery have following advantage:

a novel button cell, anodal positive pole casing inboard of locating, the positive pole shell is equipped with the boss, the positive pole casing toward anodal direction toward support hold in the boss surface forms a concave surface. The convex battery positive cover ensures good contact property inside the battery pole piece; the convex battery positive cover ensures the reliability of the internal contact of the battery pole piece, reduces the uncontrollable factors, realizes the fixation of the pole piece by the lug boss, reduces the possibility of short circuit, and improves the stability of the battery performance and the consistency of the discharge capacity. The height of the lug boss is 2-500 mu m, the pole piece is easy to shift when the height of the lug boss is too low, and the transmission of positive and negative lithium ions is blocked when the height of the lug boss is too high. And the utility model discloses a circuit is simple, is applicable to the use of the anodal shell of simple knot electricity of laboratory rank, and the pole piece of detaining the battery is difficult to slide, and is easy to fix, is difficult to take place the short circuit. The situations of cell movement, liquid leakage and the like can not occur in the packaging process and the use process of the battery, and the service life of the battery is prolonged.

Drawings

The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. In the drawings:

fig. 1 is a schematic view of a novel button cell according to an embodiment of the present invention.

Description of reference numerals:

1-a negative cover; 2-a positive electrode shell; 3-sealing ring; 4-positive electrode; 5-a separator; 6-negative pole; 7-positive plate; 8-boss.

Detailed Description

It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used merely for convenience of description and for 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. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

As shown in fig. 1, a novel button cell comprises a negative electrode cover 1, a positive electrode shell 2, a sealing ring 3, a positive electrode 4, a diaphragm 5, a negative electrode 6 and an electrolyte, wherein the sealing ring 3 is hermetically connected with the negative electrode cover 1 and the positive electrode shell 2, and enables the negative electrode cover 1 and the positive electrode shell 2 to form a sealed cavity, and the positive electrode 4, the diaphragm 5, the negative electrode 6 and the electrolyte are arranged in the sealed cavity; anodal 4 includes anodal casing 2, the outside of anodal casing 2 is equipped with boss 8, sets up flutedly above the boss 8, is equipped with positive plate 7 in the recess.

The positive plate 7 is tightly abutted to the positive shell 2, and the size of the groove is matched with that of the positive plate 7.

The positive plate 7 is concentric with the positive housing 2.

The height of the boss 8 is 2 μm to 500 μm. The height of the lug boss 8 is too low, the pole piece is easy to shift, and the transmission of positive and negative lithium ions is blocked due to too high height.

The diameter of the boss 8 is 2mm-30 mm.

The material of the positive electrode shell 2 is one of stainless steel, aluminum-plated stainless steel or gold-plated stainless steel.

The thickness of the positive electrode shell 2 is 0.5mm-10 mm.

Example 1

Step 1: according to the mass ratio of 90: 5: 5, mixing a positive electrode material NCM811, carbon black SuperP, polyvinylidene fluoride (Solvey5130) and a solvent N-methyl pyrrolidone to form slurry, and uniformly coating the slurry on the surface of an aluminum foil to obtain a positive electrode piece; and then, assembling the lithium ion battery in a glove box by taking a lithium sheet as a negative electrode sheet and taking a 1mol/L Ethylene Carbonate (EC) and dimethyl carbonate (DMC) solution of lithium hexafluorophosphate (the mass ratio of EC to DMC is 1: 1) as electrolyte to obtain the lithium ion battery.

Step 2: when assembling in the glove box, use the positive lid of the positive pole of convex battery of this patent design.

Comparative example 1

In the second step, a common positive electrode cap of the battery is used when assembling the battery in a glove box, similarly to the step 1 of the example 1.

The batteries obtained in example 1 and example 2 were subjected to cycle performance tests on lithium ion batteries using an electrochemical tester at a test temperature of 25 ℃, and the batteries were subjected to 10 tests while changing the first charge/discharge capacity, and the first charge/discharge performance of the batteries was tested while the current density was 0.1C (1C: 180mA/g) and the charge/discharge voltage was in the range of 3 to 4.3V. The first charge-discharge capacity, the first effect and the corresponding 50-turn discharge cycle performance retention rate of the battery are tested at 0.1 ℃. The test results are shown in tables 1 and 2.

Can derive from embodiment and comparative example charge-discharge efficiency and circulation stability, detain the electricity battery equipment and use the utility model relates to an outer protruding formula battery positive cover can effectively improve and detain electricity electrochemical properties uniformity. And the utility model discloses a circuit is simple, is applicable to the use of the anodal shell of simple knot electricity of laboratory rank, and the pole piece of detaining the battery is difficult to slide, and is easy to fix, is difficult to take place the short circuit. The situations of cell movement, liquid leakage and the like can not occur in the packaging process and the use process of the battery, and the service life of the battery is prolonged.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A novel button cell is characterized in that: the lithium battery comprises a negative electrode cover (1), a positive electrode shell (2), a sealing ring (3), a positive electrode (4), a diaphragm (5), a negative electrode (6) and electrolyte, wherein the sealing ring (3) is connected with the negative electrode cover (1) and the positive electrode shell (2) in a sealing manner, the negative electrode cover (1) and the positive electrode shell (2) form a sealing cavity, and the positive electrode (4), the diaphragm (5), the negative electrode (6) and the electrolyte are arranged in the sealing cavity; the outer side of the positive shell (2) is provided with a boss (8), a groove is formed in the boss (8), and a positive plate (7) is arranged in the groove.

2. The novel button cell battery as defined in claim 1, wherein: the positive plate (7) is tightly abutted to the positive shell (2), and the size of the groove is matched with that of the positive plate (7).

3. The novel button cell battery as defined in claim 1, wherein: the positive plate (7) is concentric with the positive shell (2).

4. The novel button cell battery as defined in claim 1, wherein: the height of the boss (8) is 2-500 μm.

5. The novel button cell battery as defined in claim 1, wherein: the diameter of the boss (8) is 2mm-30 mm.

6. The novel button cell battery as defined in claim 1, wherein: the positive electrode shell (2) is made of one of stainless steel, aluminum-plated stainless steel or gold-plated stainless steel.

7. The novel button cell battery as defined in claim 1, wherein: the thickness of the positive electrode shell (2) is 0.5mm-10 mm.