CN213401343U

CN213401343U - Cover plate assembly of lithium ion button battery and button battery

Info

Publication number: CN213401343U
Application number: CN202022228729.8U
Authority: CN
Inventors: 丁剑
Original assignee: Guangdong Vdl New Energy Co ltd
Current assignee: Guangdong Vdl New Energy Co ltd
Priority date: 2020-10-09
Filing date: 2020-10-09
Publication date: 2021-06-08
Anticipated expiration: 2030-10-09

Abstract

The utility model relates to the field of button cells, and discloses a cover plate component of a lithium ion button cell, which comprises a stainless steel cover plate, an aluminum block arranged at the inner side of the stainless steel cover plate, and an insulating sealing element arranged between the stainless steel cover plate and the aluminum block; one side of the insulating sealing element, which is back to the stainless steel cover plate, is provided with a containing groove, the aluminum block comprises a step part embedded into the containing groove, the stainless steel cover plate is provided with a round hole penetrating through the body, and the aluminum block is exposed to the outside from the round hole; the utility model also discloses a button cell, the utility model provides a current button cell because the apron subassembly is too thick and the great technical problem that energy density that leads to existence of occupation space is low, this apron subassembly has the advantage that the thickness is thinner, has improved the energy density of battery greatly, is favorable to keeping the outstanding leakproofness of battery, has improved the stability and the reliability of battery, has prolonged the life of battery greatly, satisfies the demand in market.

Description

Cover plate assembly of lithium ion button battery and button battery

Technical Field

The utility model relates to a button cell field especially relates to a lithium ion button cell's apron subassembly and button cell.

Background

At present, when most battery manufacturers manufacture thin metal shell lithium secondary batteries, a shell outside a battery core adopts a circular metal shell, and the structure of the circular metal shell is divided into three layers: interior casing, shell body and sealing washer, consequently lithium ion battery among the prior art radially occupies more space volume, leads to the space of battery product can not make full use of diameter direction, consequently has the lower technical problem of the energy density of battery, wherein sealed R angle sealing technique that adopts between interior casing and the shell body, relies on the compression plastic sealing washer to realize sealing between it. However, the prior art measures the R angle not very accurately, so that the good sealing performance between the inner shell and the outer shell cannot be completely ensured, and the technical problems of low product reliability and low yield exist. In addition, the inner shell and the outer shell of the steel shell are respectively used as a positive electrode and a negative electrode, so that the problem of short circuit of a battery product is easy to occur.

In order to improve the above technical problems, in recent years, a new structure has been developed, that is, a similar structure of the current power aluminum-casing battery is adopted, as shown in fig. 1, a battery product in the prior art is adopted, which uses a single-layer metal casing 83 as a negative electrode, an aluminum cap 81 of another polarity is arranged on one side of the metal casing 83, an insulation processing manner between the metal casing 83 and the aluminum cap 81 is a riveted structure, and the greatest disadvantage of the riveted structure is that one side of the axial direction of the battery core has a five-layer structure: namely, the aluminum cap 81, the first insulating layer 82, the metal casing 83, the second insulating layer 84 and the rivet 85, the five-layer structure occupies too much space, usually more than 1mm, so that the battery product cannot fully utilize the axial space, and the energy density of the battery is low.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome the above-mentioned defect among the prior art, provide a lithium ion button cell's apron subassembly and button cell, its button cell who solves among the prior art is because the apron subassembly is too thick and the great technical problem that leads to the energy density that exists of occupation space is low.

In order to achieve the above purpose, the utility model provides a cover plate component of a lithium ion button cell, which comprises a stainless steel cover plate, an aluminum block arranged at the inner side of the stainless steel cover plate, and an insulating sealing element arranged between the stainless steel cover plate and the aluminum block; one side that insulating seal spare dorsad stainless steel apron is provided with the holding tank, the aluminium pig is including the step portion of embedding in the holding tank, stainless steel apron is last to be opened there is the round hole that runs through the body, the aluminium pig exposes the external world from the round hole.

Preferably, the step portion has a cylindrical outer shape.

Preferably, the thickness D1 of the area between the stainless steel cover plate and the aluminum block sealed by the insulating sealing member is between 0.05mm and 0.15 mm.

Preferably, the thickness D2 of the stainless steel cover plate is 0.075 mm-0.15 mm.

Preferably, the thickness D3 of the aluminum block is between 0.1mm and 0.15 mm.

Compared with the prior art, the utility model provides a pair of lithium ion button cell's apron subassembly's beneficial effect lies in:

the utility model is provided with the stainless steel cover plate, the aluminum block is arranged at the inner side of the stainless steel cover plate, the insulating sealing element is arranged between the stainless steel cover plate and the aluminum block, the stainless steel cover plate and the aluminum block can be respectively sealed and bonded with the insulating sealing element by adopting the novel thermal compound technology, wherein, the stainless steel cover plate is provided with the round hole which penetrates through the body, the aluminum block is exposed to the outside from the round hole, in the technical proposal, the stainless steel cover plate is taken as the cathode of the battery, the aluminum block is taken as the anode of the battery, the insulating sealing element plays the role of connecting the stainless steel cover plate and the aluminum block on one hand, and also plays the role of preventing the short circuit between the stainless steel cover plate and the aluminum block on the other hand, the cover plate component of the structure has the advantage of thinner thickness, the energy density of the battery is greatly improved, in addition, because the structure arranges the aluminum block and the, therefore, when the battery core expands, the binding force between the stainless steel cover plate and the aluminum block and the insulating sealing element cannot be reduced, so that the excellent sealing property of the battery is maintained, the stability and the reliability of the battery are improved, the service life of the battery is greatly prolonged, and the market demand is met;

in addition, one side that insulating seal spare dorsad stainless steel apron is provided with the holding tank, the aluminium pig is including the step portion that imbeds in the holding tank, through setting up this holding tank and step portion, when guaranteeing good leakproofness between insulating seal spare and the aluminium pig more easily, has further reduced the thickness of this apron subassembly, compares with the apron subassembly more than current button cell 1mm, and the thickness of this apron subassembly can be controlled between 0.225mm ~ 0.45mm to the energy density of battery has been improved by a wide margin.

The utility model also provides a button cell, including one end open-ended negative pole shell and the electric core of setting in negative pole shell inside, negative pole shell switches on mutually with the negative pole of electric core, still includes a lithium ion button cell's of above-mentioned technical scheme apron subassembly, stainless steel apron is installed at negative pole shell's opening part and is switched on mutually with negative pole shell, the aluminium pig is located negative pole shell's inside and switches on mutually with the positive pole of electric core.

Compared with the prior art, the utility model provides a pair of button cell's beneficial effect lies in:

wherein the stainless steel apron is as the negative pole of battery, and the aluminium pig is as the positive pole of battery, owing to adopted above-mentioned technical scheme's lithium ion button cell's apron subassembly for this button cell compares with traditional button cell, when guaranteeing same thickness, possesses higher energy density, and possess more outstanding leakproofness, has stability height, reliability height and long service life's advantage.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic view of the internal structure of a battery provided in the prior art;

fig. 2 is a schematic structural diagram of a button cell provided by the present invention;

fig. 3 is an exploded view of a button cell provided in the present invention;

fig. 4 is a schematic view of an internal structure of a button cell provided by the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

As shown in fig. 2-4, the present invention provides a button cell, which includes a negative electrode shell 11 with an opening at one end, a battery cell 12 disposed inside the negative electrode shell 11, and a cover plate assembly 9 disposed on one side of the opening of the negative electrode shell 11.

The cover plate assembly 9 of the lithium ion button cell battery comprises a stainless steel cover plate 1 welded with a negative electrode shell 11, an aluminum block 2 arranged on the inner side of the stainless steel cover plate 1, and an insulating sealing element 3 arranged between the stainless steel cover plate 1 and the aluminum block 2. The negative electrode shell 11 is conducted with the negative electrode of the battery cell 12, and the aluminum block 2 is located inside the negative electrode shell 11 and conducted with the positive electrode of the battery cell 12.

Specifically, insulating seal 3 is the modified PP material of individual layer or multilayer, adopts neotype hot composite technique just can be in the same place stainless steel apron 1 and aluminium pig 2 with insulating seal 3 sealing bonding respectively, wherein opens the round hole 41 that runs through the body on the stainless steel apron 1, and aluminium pig 2 exposes to the external world from the round hole 41. In this technical scheme, stainless steel apron 1 and negative pole shell 11 are as the negative pole of battery, aluminium pig 2 is as the positive pole of battery, insulating seal 3 plays the effect of connecting stainless steel apron 1 and aluminium pig 2 on the one hand, on the other hand also plays the problem of preventing stainless steel apron 1 and the short circuit of aluminium pig 2 from appearing, this lithium ion button cell's apron subassembly 9 has the advantage that the thickness is thinner, the energy density of battery has greatly been improved, in addition, because all set up aluminium pig 2 and insulating seal 3 in stainless steel apron 1's inboard, consequently, when electric core 12 when the inflation stainless steel apron 1 and aluminium pig 2 respectively with insulating seal 3 between the cohesion can not reduce, be favorable to keeping the outstanding leakproofness of battery, improve the stability and the reliability of battery, the life of battery has been prolonged greatly, satisfy the demand in market.

More specifically, the side of the insulating sealing member 3 facing away from the stainless steel cover plate 1 is provided with a receiving groove 31, and the aluminum block 2 includes a step portion 21 embedded in the receiving groove 31. Through setting up this holding tank 31 and step portion 21, when guaranteeing better leakproofness between insulating seal 3 and the aluminium pig 2 more easily, further reduced lithium ion button cell's apron subassembly 9's thickness, compare with the apron subassembly more than current button cell 1mm, this lithium ion button cell's apron subassembly 9's thickness can be controlled between 0.225mm ~ 0.45mm to the energy density of battery has been improved by a wide margin.

In summary, due to the cover plate assembly 9 of the lithium ion button cell, compared with the conventional button cell, the button cell has higher energy density and more excellent sealing property while ensuring the same thickness, and has the advantages of high stability, high reliability and long service life.

Further, in the present embodiment, the outer shape of the step portion 21 is preferably a cylindrical shape for easy processing. As shown in fig. 4, the thickness D1 of the region where the insulating seal 3 seals between the stainless steel cover plate 1 and the aluminum block 2 is preferably between 0.05mm and 0.15 mm. The thickness D2 of the stainless steel cover plate 1 is preferably 0.075 mm-0.15 mm. The thickness D3 of aluminum block 2 is preferably between 0.1mm and 0.15 mm.

The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be equivalent replacement modes, and all are included in the scope of the present invention.

Claims

1. The cover plate component of the lithium ion button cell comprises a stainless steel cover plate (1), and is characterized by also comprising an aluminum block (2) arranged on the inner side of the stainless steel cover plate (1) and an insulating sealing element (3) arranged between the stainless steel cover plate (1) and the aluminum block (2);

one side of insulating seal spare (3) stainless steel apron (1) dorsad is provided with holding tank (31), step portion (21) in holding tank (31) are including imbedding in aluminium piece (2), stainless steel apron (1) is gone up to open has round hole (41) that run through the body, aluminium piece (2) expose to the external world from round hole (41).

2. The cover plate assembly of a lithium-ion button cell battery according to claim 1, characterized in that the step (21) is cylindrical in shape.

3. The cover plate assembly of a lithium-ion button cell according to claim 1, characterized in that the thickness D1 of the insulating seal (3) sealing the area between the stainless steel cover plate (1) and the aluminum block (2) is between 0.05mm and 0.15 mm.

4. The cover plate assembly of the lithium-ion button cell according to claim 1, wherein the thickness D2 of the stainless steel cover plate (1) is 0.075mm to 0.15 mm.

5. The cover plate assembly of a lithium-ion button cell according to claim 1, characterized in that the thickness D3 of the aluminum block (2) is between 0.1mm and 0.15 mm.

6. The button cell comprises a negative electrode shell (11) with an opening at one end and an electric core (12) arranged inside the negative electrode shell (11), wherein the negative electrode shell (11) is communicated with the negative electrode of the electric core (12), the button cell is characterized by further comprising the cover plate component of the lithium ion button cell, the stainless steel cover plate (1) is arranged at the opening of the negative electrode shell (11) and is communicated with the negative electrode shell (11), and the aluminum block (2) is located inside the negative electrode shell (11) and is communicated with the positive electrode of the electric core (12).