CN113809486B - Steel shell button cell - Google Patents
Steel shell button cell Download PDFInfo
- Publication number
- CN113809486B CN113809486B CN202111146742.1A CN202111146742A CN113809486B CN 113809486 B CN113809486 B CN 113809486B CN 202111146742 A CN202111146742 A CN 202111146742A CN 113809486 B CN113809486 B CN 113809486B
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- sealing cover
- liquid injection
- button cell
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 70
- 239000010959 steel Substances 0.000 title claims abstract description 70
- 238000007789 sealing Methods 0.000 claims abstract description 261
- 239000007788 liquid Substances 0.000 claims abstract description 127
- 238000002347 injection Methods 0.000 claims abstract description 90
- 239000007924 injection Substances 0.000 claims abstract description 90
- 239000004831 Hot glue Substances 0.000 claims description 6
- 238000010992 reflux Methods 0.000 claims description 6
- 239000003792 electrolyte Substances 0.000 description 78
- 238000003466 welding Methods 0.000 description 37
- 230000000694 effects Effects 0.000 description 14
- 238000000034 method Methods 0.000 description 11
- 230000008569 process Effects 0.000 description 10
- 239000011324 bead Substances 0.000 description 7
- 230000003749 cleanliness Effects 0.000 description 7
- 238000007599 discharging Methods 0.000 description 7
- 125000006850 spacer group Chemical group 0.000 description 7
- 238000010438 heat treatment Methods 0.000 description 5
- 230000009194 climbing Effects 0.000 description 4
- 238000001125 extrusion Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000035939 shock Effects 0.000 description 4
- 230000002411 adverse Effects 0.000 description 3
- 239000012943 hotmelt Substances 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 description 1
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
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- 230000000747 cardiac effect Effects 0.000 description 1
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- 238000004880 explosion Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/60—Arrangements or processes for filling or topping-up with liquids; Arrangements or processes for draining liquids from casings
- H01M50/609—Arrangements or processes for filling with liquid, e.g. electrolytes
- H01M50/627—Filling ports
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0422—Cells or battery with cylindrical casing
- H01M10/0427—Button cells
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0431—Cells with wound or folded electrodes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/116—Primary casings; Jackets or wrappings characterised by the material
- H01M50/117—Inorganic material
- H01M50/119—Metals
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/147—Lids or covers
- H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
- H01M50/169—Lids or covers characterised by the methods of assembling casings with lids by welding, brazing or soldering
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/183—Sealing members
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/60—Arrangements or processes for filling or topping-up with liquids; Arrangements or processes for draining liquids from casings
- H01M50/609—Arrangements or processes for filling with liquid, e.g. electrolytes
- H01M50/627—Filling ports
- H01M50/636—Closing or sealing filling ports, e.g. using lids
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Inorganic Chemistry (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The application provides a steel shell button cell. The steel shell button cell comprises a top cover assembly, a cell assembly, a bottom shell and a sealing cover, wherein the bottom shell is provided with a containing cavity, a placing opening and a liquid injection opening, the placing opening is communicated with one side of the containing cavity, the liquid injection opening is communicated with one side of the containing cavity away from the placing opening, the diameter of the liquid injection opening is smaller than that of the placing opening, the cell assembly is placed in the containing cavity, the top cover assembly covers the placing opening, and the sealing cover covers the liquid injection opening. The steel shell button cell has good sealing performance, can effectively prevent liquid leakage and is easy to weld.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a steel shell button battery.
Background
Button cells, because of their small size, are widely used in various miniature electronic products, such as: computer motherboard, electronic watch, electronic dictionary, electronic scale, remote controller, electric toy, cardiac pacemaker, counter, etc. Button cells are also called button cells, which refer to cells with an external dimension like a small button, generally having a larger diameter and a thinner thickness; the steel shell button cell consists of a positive plate, a negative plate, a diaphragm, electrolyte and the like, wherein the shell is made of stainless steel, the steel shell of the button cell comprises a bottom shell and a top cover, after the electrolyte is injected into a cell coil core in the bottom shell, the top cover is covered at an opening of the bottom shell, and then laser sealing welding is carried out, so that the complete steel shell button cell is obtained.
However, after the top and bottom steel shells of the steel shell button cell are soaked by electrolyte, fog and frost surfaces are formed on the surfaces, and the fog and frost layers are heated and evaporated to generate bubbles during laser high-temperature welding, so that the weld joint is poor in false welding and air holes. In addition, electrolyte on the surface of the steel shell remains, and mixed gas is released by evaporation during laser high-temperature welding, so that poor color change of the surface of the welding line is caused.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a steel shell button cell which has good sealing performance, can effectively prevent liquid leakage and is easy to weld.
The aim of the invention is realized by the following technical scheme:
The utility model provides a steel casing button cell, includes top cap subassembly, electric core subassembly, drain pan and sealed lid, be formed with in the drain pan and hold the chamber, the mouth of placing has been seted up to one side of drain pan, the other side of drain pan has been seted up annotates the liquid mouth, place the mouth with annotate the liquid mouth all with hold the chamber intercommunication, annotate the liquid mouth with hold the chamber and keep away from one side intercommunication of placing the mouth, annotate the liquid mouth diameter and be less than place the mouth diameter, electric core subassembly place in hold the intracavity, the top cap subassembly lid is located place the mouth, sealed lid is located annotate the liquid mouth.
In one embodiment, the top cover assembly comprises an upper shell, a first sealing gasket and a shell cap, wherein the shell cap is connected with the battery cell assembly, the upper shell, the first sealing gasket and the shell cap are sequentially stacked, and the first sealing gasket is located at one side of the shell cap, which is away from the battery cell assembly.
In one embodiment, the shell cap comprises a cap peak body and a protruding portion, the protruding portion is connected with the cap peak body, and the first sealing gasket is sleeved on the protruding portion.
In one embodiment, the sealing cover comprises a sealing cover main body and a second sealing gasket, one side of the second sealing gasket is attached to the sealing cover body, and one side, away from the sealing cover main body, of the second sealing gasket is covered on the liquid injection port.
In one embodiment, the battery cell assembly comprises a core body, a positive electrode tab and a negative electrode tab, wherein the core body is respectively connected with the positive electrode tab and the negative electrode tab, the positive electrode tab is connected with the top cover assembly, and the negative electrode tab is connected with the bottom shell.
In one embodiment, the core is a wound or laminated cell.
In one embodiment, the bottom shell is provided with an automatic backflow structure, and the liquid injection port is arranged in the automatic backflow structure.
In one embodiment, the steel can button cell further comprises a first insulating gasket mounted between the cell assembly and the bottom case.
In one embodiment, the steel can button cell further comprises a second insulating spacer mounted between the cell assembly and the cap assembly.
In one embodiment, the bottom shell is provided with a two-dimensional code area.
Compared with the prior art, the invention has at least the following advantages:
1. The steel shell button cell comprises a top cover assembly, a battery cell assembly, a bottom shell and a sealing cover, wherein a containing cavity is formed in the bottom shell, a placing opening is formed in one side of the bottom shell, a liquid injection opening is formed in the other side of the bottom shell, the placing opening and the liquid injection opening are communicated with the containing cavity, namely, the opening for placing the battery cell assembly is not identical to the liquid injection opening, so that the placing operation and the liquid injection operation of the battery cell assembly can be respectively carried out at two positions of the steel shell button cell, the battery cell assembly is placed in the containing cavity, the top cover assembly can be welded to the placing opening of the bottom shell without liquid injection, the tightness of the steel shell button cell is improved, then electrolyte is injected through the liquid injection opening in the bottom shell, which is far away from the side of the placing opening, and accordingly leakage can be effectively prevented, adverse effects on sealing welding caused by electrolyte residues on the surface of the steel shell are avoided, and the tightness of the steel shell button cell is further improved.
2. The liquid injection port in the steel shell button cell is arranged on one side of the bottom shell far away from the placement port, and the sealing cover is covered on the liquid injection port after the liquid injection operation is completed through the liquid injection port, and the liquid injection port is also equivalent to the sealing port of the steel shell button cell. Because the diameter of the liquid injection port is smaller than that of the placement port, the sealing cover is not easy to be polluted by electrolyte when the sealing cover is closed, so that the sealing cover is easier to weld when the sealing cover is closed, and the welding efficiency is improved; meanwhile, the pressure of the sealing cover to the battery core is smaller when the sealing cover is closed, so that electrolyte in the battery core can be effectively prevented from overflowing from the surface of the steel shell due to extrusion, and the welding yield of the steel shell button cell is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of an exploded structure of a steel-shell button cell in one embodiment;
FIG. 2 is a schematic view of the assembled steel-shell button cell shown in FIG. 1;
FIG. 3is a schematic cross-sectional view of the steel-cased button cell of FIG. 1;
FIG. 4 is a schematic view of an automatic reflow structure in the steel-clad button cell shown in FIG. 1;
FIG. 5 is a schematic cross-sectional view of an automatic reflow structure in the steel-clad button cell of FIG. 1;
Fig. 6 is an enlarged schematic view of a sectional structure of an automatic reflow structure in the steel-can button cell shown in fig. 1.
Detailed Description
In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. The drawings illustrate preferred embodiments of the invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
The application provides a steel shell button cell. Above-mentioned steel-shelled button cell includes top cap subassembly, electric core subassembly, drain pan and sealed lid, be formed with in the drain pan and hold the chamber, the mouth of placing has been seted up to one side of drain pan, the liquid filling mouth has been seted up to the opposite side of drain pan, place the mouth with annotate the liquid mouth all with hold the intercommunication in chamber, annotate liquid mouth diameter less than place the mouth diameter, electric core subassembly place in hold the intracavity, top cap subassembly lid is located place the mouth, sealed lid is located annotate the liquid mouth.
As shown in fig. 1 and 2, the steel-shell button cell 10 of an embodiment includes a top cover assembly 100, a battery cell assembly 200, a bottom shell 300 and a sealing cover 400, a containing cavity 312 is formed in the bottom shell 300, a placing opening 314 is formed on one side of the bottom shell 300, a liquid filling opening 316 is formed on the other side of the bottom shell 300, the placing opening 314 and the liquid filling opening 316 are both communicated with the containing cavity 312, the diameter of the liquid filling opening 316 is smaller than that of the placing opening 314, the battery cell assembly 200 is placed in the containing cavity 312, the top cover assembly 100 covers the placing opening 314, and the sealing cover 400 covers the liquid filling opening 316.
The steel-shell button cell 10 includes a top cover assembly 100, a battery cell assembly 200, a bottom shell 300 and a sealing cover 400, wherein a containing cavity 312 is formed in the bottom shell 300, a placing opening 314 is formed on one side of the bottom shell 300, a liquid filling opening 316 is formed on the other side of the bottom shell 300, and the placing opening 314 and the liquid filling opening 316 are both communicated with the containing cavity 312. It can be understood that in the existing steel shell button cell, the placing opening for placing the battery core and the liquid injection opening are the same opening, when the battery core is placed into the shell from the placing opening, then the electrolyte is injected into the battery core from the placing opening, and after the electrolyte injection is completed, the top cover is covered on the placing opening, and then the sealing welding operation is performed. However, when closing the lid operation, because the top cap can cause a extrusion force to the electric core, the electrolyte in the electric core appears climbing or overflow the condition after the pressurized to form fog frost face on the steel shell surface, fog frost layer can be heated and evaporated and produce the bubble when laser high temperature butt fusion, leads to the welding seam to appear rosin joint and gas pocket bad. In addition, when the top cover is closed, the top cover is easily dislocated up and down or left and right, so that the top cover slides into the bottom shell 300, and the problem of electrolyte sticking occurs. The opening of the cell assembly 200 is not the same as the liquid injection opening 316, so that the placing operation and the liquid injection operation of the cell assembly 200 can be performed at two positions of the steel shell button cell 10 respectively, after the cell assembly 200 is placed in the accommodating cavity 312, the top cover assembly 100 can be welded to the placing opening 314 of the bottom shell 300 without liquid injection, the tightness of the steel shell button cell 10 is improved, and then the electrolyte is injected through the liquid injection opening 316 at one side of the bottom shell 300 far away from the placing opening 314, so that the leakage of the electrolyte can be effectively prevented, the adverse effect on sealing welding caused by the electrolyte remained on the surface of the steel shell is avoided, and the tightness of the steel shell button cell 10 is further improved. Further, the liquid filling port 316 is formed on a side of the bottom case 300 away from the placement port 314, and the sealing cover 400 is covered on the liquid filling port 316 after the liquid filling operation is completed through the liquid filling port 316, and the liquid filling port 316 is also equivalent to the sealing port of the steel-shell button cell 10. Because the diameter of the liquid injection port 316 is smaller than that of the placing port 314, the sealing cover 400 is not easy to be polluted by electrolyte when the sealing cover 400 is closed, so that the sealing cover 400 is easier to weld when the sealing cover is closed, and the welding efficiency is improved; meanwhile, the pressure of the sealing cover 400 to the battery core is smaller when the cover is closed, so that the condition that electrolyte in the battery core overflows from the surface of the steel shell due to extrusion can be effectively prevented, and the welding yield of the steel shell button cell 10 is improved.
As shown in fig. 1 and 3, in one embodiment, the top cover assembly 100 includes an upper case 110, a first gasket 120, and a case cap 130, the case cap 130 is connected to the battery cell assembly 200, the first gasket 120 is laminated with a side of the case cap 130 facing away from the battery cell assembly 200, and the upper case 110 is laminated with a side of the first gasket 120 facing away from the case cap 130. It can be appreciated that after the battery cell assembly 200 is placed in the receiving cavity 312, the top cap assembly 100 can be welded to the placement opening 314 of the bottom case 300 without injecting liquid, thereby improving the sealability of the steel-case button cell 10. However, if the sealing performance of the header assembly 100 itself is poor, a problem of leakage easily occurs. In order to improve the sealability of the top cap assembly 100, in the present embodiment, the top cap assembly 100 includes an upper case 110, a first gasket 120, and a case cap 130, the case cap 130 is connected to the battery cell assembly 200, the first gasket 120 is laminated with a side of the case cap 130 facing away from the battery cell assembly 200, and the upper case 110 is laminated with a side of the first gasket 120 facing away from the case cap 130. When the cap assembly 100 is welded to the placement port 314 of the bottom case 300, the first gasket 120 can enhance the sealability of the cap assembly 100, effectively preventing the leakage of the electrolyte from the cap assembly 100. And the first sealing gasket 120 is laminated with one side of the shell cap 130, which is away from the battery cell assembly 200, and the upper shell 110 is laminated with one side of the first sealing gasket 120, which is away from the shell cap 130, and the stability of the first sealing gasket 120 can be clamped and improved through the shell cap 130 and the upper shell 110, so that the sealing effect of the first sealing gasket 120 is ensured, and the sealing performance of the top cover assembly 100 is improved.
Further, the shell cap 130 includes a cap bill body 1320 and a boss 1340, the boss 1340 is connected to the cap bill body 1320, and the first gasket 120 is sleeved on the boss 1340. It can be appreciated that the first gasket 120 is laminated with the side of the case cap 130 facing away from the battery cell assembly 200, and the upper case 110 is laminated with the side of the first gasket 120 facing away from the case cap 130, so that the stability of the first gasket 120 can be clamped and improved by the case cap 130 and the upper case 110. However, the first gasket 120 is easily slid with respect to the cap 130 and the upper case 110, thereby easily causing a gap, which affects the sealability of the top cap assembly 100. In order to further improve the stability of the first sealing pad 120, in this embodiment, the shell cap 130 includes a cap peak body 1320 and a protruding portion 1340, the protruding portion 1340 is connected to the cap peak body 1320, the first sealing pad 120 is sleeved on the protruding portion 1340, and the first sealing pad 120 is provided with a through hole, and the size of the through hole is matched with the size of the protruding portion 1340. When the cap assembly 100 performs the capping operation, the cap peak body 1320 can support the cap assembly 100, and the first gasket 120 is sleeved on the protrusion 1340, so that the protrusion 1340 can fix the first gasket 120, thereby further improving the stability of the first gasket 120 and further improving the sealing performance of the cap assembly 100.
As shown in fig. 1 and 3, in one embodiment, the sealing cover 400 includes a sealing cover main body 410 and a second sealing pad 420, one side of the second sealing pad 420 is attached to the sealing cover 400, and a side of the second sealing pad 420 facing away from the sealing cover main body 410 is covered on the liquid injection port 316. It will be appreciated that, after the injection of the electrolyte is completed, the sealing cap 400 is covered on the injection port 316, so that the sealing cap 400 is closed, and then laser welding is performed to seal the steel-can button cell 10. However, when the sealing cover 400 is closed, electrolyte is easy to remain at the joint of the sealing cover 400 and the liquid injection port 316, a fog and frost surface is formed on the surface of the casing at the joint of the sealing cover 400 and the liquid injection port 316 after the casing is soaked by the electrolyte, and the fog and frost layer is heated and evaporated to generate bubbles during laser high-temperature welding, so that the weld joint is poor in false welding and air holes. In addition, electrolyte on the surface of the steel shell remains, and mixed gas is released by evaporation during laser high-temperature welding, so that poor color change of the surface of the welding line is caused. In order to improve the tightness of the sealing cover 400 after closing, in this embodiment, the sealing cover 400 includes a sealing cover main body 410 and a second sealing pad 420, one side of the second sealing pad 420 is attached to the sealing cover 400, and one side of the second sealing pad 420, which is away from the sealing cover main body 410, is covered on the liquid injection port 316. When the sealing cover 400 is closed, the second sealing pad 420 is covered above the liquid injection port 316, so that the second sealing pad 420 seals the liquid injection port 316, and part of the second sealing pad 420 contacts with the electrolyte; because the second gasket 420 has better sealing property, the electrolyte is not easy to overflow from the liquid injection port 316 after the sealing cover 400 is closed. The material of the second sealing pad 420 is soft, so that the structural strength of the second sealing pad 420 is weak, and the second sealing pad 420 is easy to be damaged to cause liquid leakage. Since the sealing cover 400 includes the sealing cover main body 410 and the second sealing pad 420, the sealing cover main body 410 is a hard shell, one side of the second sealing pad 420 is attached to the sealing cover 400, and one side of the second sealing pad 420, which is away from the sealing cover main body 410, is covered on the liquid injection port 316. When the sealing cover 400 is closed, the sealing cover main body 410 can support and fix the second sealing gasket 420, so that the structural strength of the sealing cover 400 is improved, and meanwhile, the sealing cover main body 410 can further press the second sealing gasket 420, so that the tightness between the second sealing gasket 420 and the liquid injection port 316 is improved, and the sealing effect of the second sealing gasket 420 is improved. In addition, the laser welding can form a welding seam at the joint of the sealing cover 400 and the bottom case 300, thereby completely blocking the gap between the sealing cover 400 and the bottom cover, effectively preventing the occurrence of liquid leakage, and the second sealing gasket 420 can effectively isolate the contact between the electrolyte and the sealing cover main body 410, and prevent the problem that the electrolyte interferes with the laser welding between the sealing cover 400 and the bottom case 300, thereby improving the stability of the laser welding, and further improving the sealability of the steel shell button cell 10.
As shown in fig. 1, in one embodiment, the battery cell assembly 200 includes a core 210, a positive tab 220 and a negative tab 230, wherein the core 210 is connected to the positive tab 220 and the negative tab 230, the positive tab 220 is connected to the top cover assembly 100, and the negative tab 230 is connected to the bottom case 300. In this embodiment, a positive electrode connection portion is disposed in the bottom case 300, a negative electrode connection portion is disposed in the top cover assembly 100, and when the battery cell assembly 200 is placed in the bottom case 300, the positive electrode tab 220 is connected to the positive electrode connection portion, and the negative electrode tab 230 is connected to the negative electrode connection portion, so that the core 210 can be respectively connected to the top cover assembly 100 and the bottom case 300. Further, a first groove is formed in the bottom case 300, a second groove is formed in the top cover assembly 100, after the battery cell assembly 200 is placed in the accommodating cavity 312, the positive electrode tab 220 and the negative electrode tab 230 are bent, the bent positive electrode tab 220 is placed in the second groove, and the bent negative electrode tab 230 is placed in the first groove, so that the flatness between the battery cell assembly 200 and the bottom case 300 and the top cover assembly 100 is improved, and the structural stability of the steel-shell button cell 10 is further improved.
In one embodiment, the core 210 is a wound or laminated cell. In the embodiment, the winding body battery core has better high-low temperature performance, can work at the temperature of-55 ℃ to 75 ℃, can normally start discharging and charging at the temperature of-55 ℃, and does not deform or bulge at the temperature of 80 ℃ and does not have explosion danger. Further, since the inside of the wound body battery core is spirally wound, sulfuric acid is adsorbed by the wound body battery core separator entirely, so that no flowing liquid is present in the wound body steel shell button cell 10, and no liquid leakage occurs even if the wound body steel shell button cell 10 is operated upside down, thereby improving the leakage-proof effect of the steel shell button cell 10. The surface of the pole piece in the laminated body battery cell is smoother, no tension influence exists in the length direction, and the contact between the pole piece and the diaphragm is more sufficient, so that the consistency of interface reaction in the battery cell is improved.
In one embodiment, the bottom case 300 is provided with an automatic backflow structure, and the liquid filling port 316 is formed in the automatic backflow structure. In this embodiment, the automatic reflux structure is step-shaped, that is, there is a difference in height between the automatic reflux structure and the plane where the liquid injection port 316 is located, even if electrolyte overflows from the liquid injection port 316, the automatic reflux structure can also enable the overflowed electrolyte to flow back into the casing, thereby effectively preventing the electrolyte in the casing from climbing up, enabling the overflowed electrolyte not to reach the sealing cover 400, further improving the neatness of the sealing cover 400 and the stability of the sealed welding of the steel-shell button cell 10. Further, when the sealing cover 400 is closed, the sealing cover 400 is connected with the automatic backflow structure, so that the automatic backflow structure can prevent the sealing cover 400 from being contacted with the electrolyte of the liquid injection port 316 during closing, namely, the sealing cover 400 can be prevented from sliding into the shell to bring out the electrolyte during assembling, thereby further improving the cleanliness of the sealing cover 400 and further improving the stability of sealing and welding of the steel shell button cell 10.
As shown in fig. 4, in one embodiment, the automatic backflow structure 700 includes a housing 710 and a sealing cover plate 720, the housing 710 includes a sealing housing 712 and an inverted housing 714, the inverted housing 714 is connected to the sealing housing 712, the inverted housing 714 is provided with an automatic backflow step 7142 and a liquid injection portion 7144, the liquid injection portion 7144 is connected to the automatic backflow step 7142, the automatic backflow step 7142 is connected to the sealing housing 712, and the liquid injection portion 7144 is provided with a liquid injection port 7146; the sealing cover plate 720 is covered on the liquid injection part 7144, and the sealing cover plate 720 is connected with the automatic backflow step 7142.
In this embodiment, the automatic backflow structure 700 includes a housing 710 and a sealing cover plate 720, the inverted housing 714 is connected with the sealing housing 712, the inverted housing 714 is provided with an automatic backflow step 7142 and a liquid injection portion 7144, the liquid injection portion 7144 is connected with the automatic backflow step 7142, the liquid injection portion 7144 is provided with a liquid injection port 7146, the liquid injection port 7146 is used for injecting electrolyte, and the electrolyte needs to pass through the automatic backflow step 7142 for injection or outflow; further, a sealing cover plate 720 is provided to cover the liquid filling portion 7144, and the sealing cover plate 720 is connected to the automatic reflow step 7142. Because of the step-shaped structure of the automatic backflow step 7142, that is, the height difference exists between the automatic backflow step 7142 and the plane where the liquid injection port 7146 is located, even if electrolyte overflows from the liquid injection port 7146, the automatic backflow step 7142 can enable the overflowed electrolyte to flow back into the shell 710, so that the electrolyte in the shell 710 is effectively prevented from climbing up, the overflowed electrolyte cannot reach the sealing cover plate 720, the cleanliness of the sealing cover plate 720 is improved, and the stability of sealing welding of the steel shell button cell is improved. Further, the automatic backflow step 7142 not only can effectively prevent the electrolyte in the housing 710 from creeping up, so that the overflowed electrolyte cannot reach the sealing cover plate 720, but also can serve as a pressure-bearing step of the sealing cover plate 720. Because the sealing cover plate 720 is covered on the liquid injection part 7144, the sealing cover plate 720 is connected with the automatic backflow step 7142, so that the automatic backflow step 7142 can prevent the sealing cover plate 720 from being contacted with electrolyte of the liquid injection port 7146 when the sealing cover plate 720 is closed, namely, the sealing cover plate 720 can be prevented from sliding into the shell 710 to bring out the electrolyte when the sealing cover plate 720 is assembled, thereby further improving the cleanliness of the sealing cover plate 720 and further improving the stability of sealing and welding of the steel shell button cell.
As shown in fig. 5 and 6, in one embodiment, the automatic reflow structure 700 further includes a gasket 730, and the gasket 730 is attached to the automatic reflow step 7142. It is understood that, although the overflowed electrolyte can flow back into the housing 710 when passing through the auto-reflow step 7142 due to the step-like structure of the auto-reflow step 7142, i.e., the level difference between the auto-reflow step 7142 and the plane of the liquid injection port 7146, a small amount of electrolyte is easily remained on the surface of the auto-reflow step 7142 after the electrolyte flows back into the housing 710. In order to prevent the sealing cover plate 720 from being contaminated with residual electrolyte when closing the cover, in this embodiment, the automatic backflow structure 700 further includes a sealing gasket 730, the sealing gasket 730 is attached to the automatic backflow step 7142, and the sealing gasket 730 can have good isolation and sealing effects on the electrolyte, so that the sealing cover plate 720 is contaminated with residual electrolyte when closing the cover, the cleanliness of the sealing cover plate 720 after closing the cover is ensured, and the stability of sealing welding of the steel shell button cell is improved. In addition, the gasket 730 also has a good insulation function, thereby improving the performance stability of the steel-case button cell.
Further, the front projection area of the gasket 730 is larger than the front projection area of the liquid injection portion 7144. It can be appreciated that the sealing gasket 730 can perform better isolation and sealing functions on the electrolyte, so that the sealing cover plate 720 is stained with the residual electrolyte when the sealing cover plate 720 is closed, the cleanliness of the sealing cover plate 720 after the sealing cover plate 720 is closed is ensured, and the stability of sealing and welding of the steel shell button cell is improved. In addition, the gasket 730 can also perform a good insulating function. In order to further improve the adhesion between the gasket 730 and the auto-reflow step 7142 and prevent leakage of the electrolyte, in this embodiment, the orthographic projection area of the gasket 730 is larger than that of the liquid injection portion 7144, so that the gasket 730 can completely seal the liquid injection port 7146 and the liquid injection portion 7144 around the liquid injection port 7146, thereby further improving the sealing performance of the gasket 730 and further improving the anti-creeping effect of the auto-reflow structure 700.
Further, the sealing cover 720 is half-wrapped in the gasket 730. It is understood that the sealing cover plate 720 is covered with the liquid filling portion 7144, and the sealing cover plate 720 is connected to the automatic reflow step 7142, so that the edge of the sealing cover plate 720 is easily contaminated by overflowed electrolyte if the sealing cover plate 720 is directly contacted with the automatic reflow step 7142. In order to further prevent the sealing cover plate 720 from contacting with the electrolyte, in this embodiment, the sealing cover plate 720 is half-coated in the sealing gasket 730, so as to avoid the sealing cover plate 720 from directly contacting with the dynamic reflux step, effectively prevent the sealing cover plate 720 from contacting with the electrolyte, and meanwhile, the sealing gasket 730 can better prevent the sealing cover plate 720 from sliding into the liquid injection port 7146 to bring out the electrolyte when closing the cover, thereby improving the safety of the sealing cover plate 720 when closing the cover. In addition, the sealing cover plate 720 is half-coated in the sealing gasket 730, and the sealing gasket 730 can also play a better role in buffering the sealing cover plate 720, so that the stability of the automatic reflow structure 700 is improved.
As shown in fig. 5 and 6, in one embodiment, the automatic reflow structure 700 further includes a sealing hot melt adhesive ring 740, and the sealing hot melt adhesive ring 740 is sleeved between the sealing cover plate 720 and the automatic reflow step 7142. It will be appreciated that, after the sealing cover 720 is disposed on the liquid injection portion 7144, a groove exists between the circumference of the sealing cover 720 and the sealing housing 712. In order to improve the tightness and insulation at the sealing cover plate 720, in this embodiment, the automatic reflow structure 700 further includes a sealing hot melt rubber ring 740, the sealing hot melt rubber ring 740 is sleeved between the sealing cover plate 720 and the automatic reflow step 7142, the automatic reflow step 7142 is connected with the sealing housing 712, and the sealing hot melt rubber ring 740 can improve the tightness between the sealing cover plate 720 and the automatic reflow step 7142 and the tightness between the sealing cover plate 720 and the sealing housing 712. In addition, the sealing hot melt adhesive ring 740 has better insulativity, and the sealing hot melt adhesive ring 740 is sleeved between the sealing cover plate 720 and the automatic reflow step 7142, so that the insulativity of the automatic reflow structure 700 can be effectively improved.
In one embodiment, the height of the auto-reflow step 7142 is equal to the sum of the heights of the seal cover 720 and the gasket 730. It can be appreciated that the automatic backflow step 7142 not only can effectively prevent the electrolyte in the housing 710 from creeping up, so that the overflowed electrolyte cannot reach the sealing cover plate 720, but also the automatic backflow step 7142 can serve as a pressure-bearing step of the sealing cover plate 720. Because the sealing cover plate 720 is covered on the liquid injection part 7144, the sealing cover plate 720 is connected with the automatic backflow step 7142, so that the automatic backflow step 7142 can prevent the sealing cover plate 720 from being contacted with electrolyte of the liquid injection port 7146 when the sealing cover plate 720 is closed, namely, the sealing cover plate 720 can be prevented from sliding into the shell 710 to bring out the electrolyte when the sealing cover plate 720 is assembled, thereby further improving the cleanliness of the sealing cover plate 720 and further improving the stability of sealing and welding of the steel shell button cell. However, if the sealing cover 720 is disposed on the liquid injection portion 7144, the sealing cover 720 is higher than the sealing case 712 or lower than the sealing case 712, which may cause uneven surface of the steel-case button cell case 710. In order to improve the flatness of the steel-shell button cell housing 710, in this embodiment, the height of the automatic reflow step 7142 is the same as the sum of the heights of the sealing cover plate 720 and the sealing gasket 730, so that the sealing cover plate 720 is covered on the liquid injection portion 7144, i.e. the sealing cover plate 720 and the sealing housing 712 are in the same plane after the cover is closed, thereby effectively improving the flatness of the steel-shell button cell housing 710.
In one embodiment, the auto reflow step 7142 is inclined at an angle of 20 degrees to 80 degrees. It can be appreciated that, due to the step-like structure of the automatic backflow step 7142, that is, the height difference exists between the plane where the automatic backflow step 7142 and the liquid injection port 7146 are located, even if the electrolyte overflows from the liquid injection port 7146, the automatic backflow step 7142 can enable the overflowed electrolyte to flow back into the casing 710, so that the electrolyte in the casing 710 is effectively prevented from climbing up, the overflowed electrolyte cannot reach the sealing cover plate 720, the cleanliness of the sealing cover plate 720 is improved, and the stability of sealing welding of the steel shell button cell is improved. However, if the inclination angle of the automatic return step 7142 is too small, the effect of preventing liquid from creeping is likely to be impossible; if the inclination angle of the automatic reflow step 7142 is too large, the area of the automatic reflow step 7142 is easy to be smaller, and the pressure-bearing effect is also poor, which is not beneficial to closing the sealing cover plate 720. In order to improve the anti-liquid-climbing effect of the automatic backflow step 7142, in this embodiment, the inclination angle of the automatic backflow step 7142 is 20-80 degrees, so that the automatic backflow step 7142 has a better anti-liquid-climbing effect, and meanwhile, the inclination angle of 20-80 degrees can enable the area of the opening direction of the automatic backflow step 7142 to be larger than the area of the sealing cover plate 720, thereby being beneficial to closing the sealing cover plate 720 and improving the pressure-bearing effect of the automatic backflow step 7142 on the sealing cover plate 720.
In one embodiment, the sealing cover plate 720 has a diameter of 3mm to 4mm. It can be understood that the diameter of the sealing cover plate 720 where the liquid injection port 7146 of the existing steel shell button cell is located is 12mm, the length of the sealing bead after liquid injection is 38mm, the length of the sealing bead is easy to prolong the time of the procedure, and the welding heating time of the shell 710 is long, so that the electrolyte is easy to generate bubbles when heated, thereby affecting the performance of the steel shell button cell. In order to optimize the length of the sealing bead after the liquid is injected into the automatic reflow structure 700, shorten the heating time and reduce the bubbles generated by the electrolyte heating, in the embodiment, the diameter of the sealing cover plate 720 is 3 mm-4 mm, compared with the length of the sealing bead after the liquid is injected into the existing steel shell button cell, the length of the sealing bead after the liquid is injected is shortened from 37.8mm to 11mm, and the length of the sealing bead is reduced by 26.8mm; and the welding heating time is shortened from 8.5S/PCS to 3.5S/PCS, and the welding time is reduced by 5S, so that the length of a sealing weld bead is effectively reduced, the heating time is shortened, the electrolyte is prevented from being heated to generate bubbles, and the stability of the automatic reflow structure 700 in sealing is further improved.
In one embodiment, the sealing cover 720 includes a cover body and a liquid release layer coupled to the cover body. It is understood that the sealing cover plate 720 is provided to cover the liquid filling portion 7144, and the sealing cover plate 720 is connected to the automatic reflow step 7142. Due to the stepped structure of the auto-reflow step 7142, that is, the level difference exists between the auto-reflow step 7142 and the plane of the liquid injection port 7146, even if the electrolyte overflows from the liquid injection port 7146, the auto-reflow step 7142 can flow the overflowed electrolyte back into the case 710. However, after the electrolyte flows back into the case 710, a residual portion of the electrolyte is easily adhered to the sealing cap plate 720, so that a small amount of electrolyte is easily overflowed, thereby affecting the welding of the steel-can button cell. In order to prevent the electrolyte from flowing back into the housing 710, a small amount of electrolyte still remains to adhere to the sealing cover plate 720, in this embodiment, the sealing cover plate 720 includes a cover plate main body and an anti-liquid-sticking layer, the anti-liquid-sticking layer is connected with the cover plate main body, and the anti-liquid-sticking layer can effectively prevent the electrolyte from adhering to the sealing cover plate 720, thereby further improving the anti-liquid-climbing effect of the automatic backflow structure 700.
As shown in fig. 1 and 3, in one embodiment, the steel-can button cell 10 further includes a first insulating spacer 500, and the first insulating spacer 500 is installed between the cell assembly 200 and the bottom case 300. It can be understood that the battery core is easy to contact with the tab and the steel shell to generate friction when shrinking occurs in the repeated charging and discharging process, and the abnormal situation of diaphragm damage can occur due to vibration impact in the using process. In order to improve the structural stability of the steel-shell button cell 10 in the charging and discharging process, in this embodiment, the steel-shell button cell 10 further includes a first insulating gasket 500, and the first insulating gasket 500 is installed between the battery cell assembly 200 and the bottom shell 300, so that friction generated by contact between the battery cell and the negative electrode tab 230 and the bottom shell 300 when the battery cell is contracted in the repeated charging and discharging process can be eliminated, and the situation that the steel-shell button cell 10 damages a diaphragm due to shock impact in the use process can be effectively prolonged, and further the performance stability of the steel-shell button cell 10 under extreme conditions such as shock impact can be ensured.
As shown in fig. 1 and 3, in one embodiment, the steel-can button cell 10 further includes a second insulating spacer 600, and the second insulating spacer 600 is installed between the cell assembly 200 and the cap assembly 100. It can be understood that the battery core is easy to contact with the tab and the steel shell to generate friction when shrinking occurs in the repeated charging and discharging process, and the abnormal situation of diaphragm damage can occur due to vibration impact in the using process. In order to improve the structural stability of the steel shell button cell 10 in the charging and discharging process, in this embodiment, the steel shell button cell 10 further includes a second insulating spacer 600, and the second insulating spacer 600 is installed between the battery core assembly 200 and the top cover assembly 100, so that friction generated by contact between the battery core and the positive electrode tab 220 and the top cover assembly 100 when the battery core is contracted in the repeated charging and discharging process can be eliminated, and the situation that the steel shell button cell 10 damages a diaphragm due to shock impact in the use process can be effectively prolonged, and further the service life of the steel shell button cell 10 can be effectively prolonged, and the performance stability of the steel shell button cell 10 under extreme conditions such as shock impact can be ensured.
As shown in fig. 2, in one embodiment, the bottom case 300 is provided with a two-dimensional code area 310. In this embodiment, two-dimensional codes can be sprayed in the two-dimensional code area 310 of the bottom shell 300, the two-dimensional codes can perform identification and differentiation functions on the steel shell button cell 10, and the two-dimensional codes have the advantages of high density coding, large information capacity, wide coding range, strong fault tolerance, error correction function and high decoding reliability, and through identification and recording of the two-dimensional codes on the steel shell button cell 10, the steel shell button cell 10 manufacturing process can adopt a refined production mode of two-dimensional code scanning management, and test and inspection data of each link in the manufacturing process are automatically stored in an MES system after scanning, so that the reliability of each performance index output of each finished steel shell button cell 10 is improved, and meanwhile, the production efficiency and the yield are improved.
Compared with the prior art, the invention has at least the following advantages:
1. The steel-shell button cell 10 of the invention comprises a top cover assembly 100, a battery cell assembly 200, a bottom shell 300 and a sealing cover 400, wherein the bottom shell 300 is provided with a containing cavity 312, a placing port 314 and a liquid injection port 316, the placing port 314 is communicated with one side of the containing cavity 312, and the liquid injection port 316 is communicated with one side of the containing cavity 312, which is far away from the placing port 314, that is, the opening for placing the battery cell assembly 200 is not the same as the liquid injection port 316, so that the placing operation and the liquid injection operation of the battery cell assembly 200 can be respectively carried out at two positions of the steel-shell button cell 10, after the battery cell assembly 200 is placed in the containing cavity 312, the top cover assembly 100 can be welded to the placing port 314 of the bottom shell 300 without liquid injection, the tightness of the steel-shell button cell 10 is improved, and then electrolyte is injected through the liquid injection port 316 in one side of the bottom shell 300, thereby effectively preventing leakage and avoiding adverse effects on sealing welding caused by electrolyte residues on the surface of the steel shell, and further improving the tightness of the steel-shell button cell 10.
2. In the steel shell button cell 10 of the present invention, the liquid filling port 316 is opened at one side of the bottom shell 300 far away from the placing port 314, and after the liquid filling operation is completed through the liquid filling port 316, the sealing cover 400 is covered on the liquid filling port 316, and the liquid filling port 316 is also equivalent to the sealing port of the steel shell button cell 10. Because the diameter of the liquid injection port 316 is smaller than that of the placing port 314, the sealing cover 400 is not easy to be polluted by electrolyte when the sealing cover 400 is closed, so that the sealing cover 400 is easier to weld when the sealing cover is closed, and the welding efficiency is improved; meanwhile, the pressure of the sealing cover 400 to the battery core is smaller when the cover is closed, so that the condition that electrolyte in the battery core overflows from the surface of the steel shell due to extrusion can be effectively prevented, and the welding yield of the steel shell button cell 10 is improved.
The foregoing examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (7)
1. The steel shell button cell is characterized by comprising a top cover assembly, a battery cell assembly, a bottom shell and a sealing cover, wherein a containing cavity is formed in the bottom shell, a placing opening is formed in one side of the bottom shell, a liquid injection opening is formed in the other side of the bottom shell, the placing opening and the liquid injection opening are communicated with the containing cavity, the diameter of the liquid injection opening is smaller than that of the placing opening, the battery cell assembly is placed in the containing cavity, the top cover assembly covers the placing opening, and the sealing cover covers the liquid injection opening;
The top cover assembly comprises an upper shell, a first sealing gasket and a shell cap, the shell cap is connected with the battery cell assembly, the upper shell, the first sealing gasket and the shell cap are sequentially stacked, and the first sealing gasket is positioned on one side of the shell cap, which is away from the battery cell assembly; the shell cap comprises a cap peak main body and a protruding part, the protruding part is connected with the cap peak main body, and the first sealing gasket is sleeved on the protruding part;
the bottom shell is provided with an automatic backflow structure, the automatic backflow structure comprises a shell and a sealing cover plate, the shell comprises a sealing shell and an inversion shell, the inversion shell is connected with the sealing shell, the inversion shell is provided with an automatic backflow step and a liquid injection part, the liquid injection part is connected with the automatic backflow step, the automatic backflow step is connected with the sealing shell, and the liquid injection part is provided with a liquid injection port; the sealing cover plate is covered on the liquid injection part and is connected with the automatic backflow step; the automatic backflow structure further comprises a sealing gasket, the sealing gasket is attached to the automatic backflow step, the orthographic projection area of the sealing gasket is larger than that of the liquid injection part, and the sealing cover plate is semi-coated in the sealing gasket; the automatic reflux structure further comprises a sealing hot melt adhesive ring, and the sealing hot melt adhesive ring is sleeved between the sealing cover plate and the automatic reflux step.
2. The steel shell button cell battery of claim 1, wherein the sealing cover comprises a sealing cover main body and a second sealing gasket, one side of the second sealing gasket is attached to the sealing cover body, and one side of the second sealing gasket, which is away from the sealing cover main body, is covered on the liquid injection port.
3. The steel-shell button cell battery of claim 1, wherein the cell assembly comprises a core, a positive electrode tab and a negative electrode tab, the core is respectively connected with the positive electrode tab and the negative electrode tab, the positive electrode tab is connected with the top cover assembly, and the negative electrode tab is connected with the bottom shell.
4. A steel can button cell according to claim 3, wherein the core is a wound body cell or a laminated body cell.
5. The steel can button cell of claim 1, further comprising a first insulating gasket mounted between the cell assembly and the bottom case.
6. The steel can button cell of claim 1, further comprising a second insulating gasket mounted between the cell assembly and the cap assembly.
7. The steel-shell button cell battery of claim 1, wherein the bottom shell is provided with a two-dimensional code area.
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| TW202141840A (en) * | 2020-03-11 | 2021-11-01 | 南韓商Ｌｇ化學股份有限公司 | Button type secondary battery |
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