CN113809486A - Button cell with steel casing - Google Patents

Button cell with steel casing Download PDF

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Publication number
CN113809486A
CN113809486A CN202111146742.1A CN202111146742A CN113809486A CN 113809486 A CN113809486 A CN 113809486A CN 202111146742 A CN202111146742 A CN 202111146742A CN 113809486 A CN113809486 A CN 113809486A
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CN
China
Prior art keywords
steel
shell
sealing
button cell
mouth
Prior art date
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Granted
Application number
CN202111146742.1A
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Chinese (zh)
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CN113809486B (en
Inventor
李路强
何其泰
沈立强
朱剑峰
刘志伟
曾贤华
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Huizhou Everpower Technology Co ltd
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Huizhou Everpower Technology Co ltd
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Priority to CN202111146742.1A priority Critical patent/CN113809486B/en
Priority claimed from CN202111146742.1A external-priority patent/CN113809486B/en
Publication of CN113809486A publication Critical patent/CN113809486A/en
Application granted granted Critical
Publication of CN113809486B publication Critical patent/CN113809486B/en
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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

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  • 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. Foretell box-type cell includes top cap subassembly, battery pack spare, drain pan and sealed lid, and the drain pan has been seted up and has been held the chamber, has been placed the mouth and has been annotated the mouth and keep away from the one side intercommunication of placing the mouth with holding the chamber, annotates the liquid mouth and keeps away from the one side intercommunication of placing the mouth, annotates liquid mouth diameter and is less than and places a mouthful diameter, and battery pack spare is placed in holding the intracavity, and top cap subassembly lid is located and is placed the mouth, and sealed lid is located and is annotated the liquid mouth. The steel shell button cell has good sealing performance, can effectively prevent liquid leakage and is easy to weld.

Description

Button cell with steel casing
Technical Field
The invention relates to the technical field of batteries, in particular to a steel shell button cell.
Background
Button cells are widely used in various miniature electronic products due to their small size, for example: computer mainboard, electronic watch, electronic dictionary, electronic scale, remote controller, electronic toy, cardiac pacemaker, counter etc.. The button cell is also called a button cell, and refers to a cell with the overall dimension like a small button, generally speaking, the diameter is larger, and the thickness is thinner; the steel-shell button cell comprises 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 roll core in the bottom shell, the top cover is covered at the 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 cases of the steel case button cell are soaked by the electrolyte, frosting surfaces are formed on the surfaces, and the frosting layers are heated and evaporated to generate bubbles during laser high-temperature welding, so that insufficient welding and poor air holes occur in welding seams. In addition, electrolyte on the surface of the steel shell remains, and mixed gas is evaporated and released during laser high-temperature welding, so that the color of the surface of a welding seam is poor.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a steel shell button cell which has better sealing performance, can effectively prevent liquid leakage and is easy to weld.
The purpose of the invention is realized by the following technical scheme:
the utility model provides a 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, one side of drain pan has been seted up and has been placed the mouth, the opposite side of drain pan has been seted up and has been annotated 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 place one side intercommunication of mouth, it is less than to annotate liquid mouth diameter place the mouth diameter, the 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.
In one embodiment, the top cap assembly comprises an upper shell, a first sealing gasket and a shell cap, the shell cap is connected with the electric core assembly, the upper shell, the first sealing gasket and the shell cap are sequentially stacked, and the first sealing gasket is located on one side of the shell cap departing from the electric core assembly.
In one embodiment, the shell cap comprises a main brim body and a protruding portion, the protruding portion is connected with the main brim 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 of the second sealing gasket, which is far away from the sealing cover main body, is covered on the liquid injection port.
In one embodiment, the electric core 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 cover.
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 opened in the automatic backflow structure.
In one embodiment, the steel-shell button cell further comprises a first insulating gasket, and the first insulating gasket is installed between the electric core assembly and the bottom shell.
In one embodiment, the steel-can button cell further comprises a second insulating gasket mounted between the core assembly and the top 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 of the invention comprises a top cover component, a cell component, 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 both communicated with the containing cavity, namely, the opening for placing the electric core component and the liquid injection port are not the same, so that the placing operation and the liquid injection operation of the electric core component can be respectively carried out at two positions of the steel shell button cell, after the electric core component is placed in the accommodating cavity, the top cover component can be welded on the placing opening of the bottom shell without filling liquid, the sealing performance of the steel shell button cell is improved, then electrolyte is injected through the liquid injection port on the side of the bottom shell far away from the placing port, thereby effectively preventing leakage, and the adverse effect on sealing welding caused by electrolyte remained on the surface of the steel shell is avoided, and the sealing property of the steel shell button cell is further improved.
2. The liquid injection port of the steel-shell button cell is arranged on one side of the bottom shell far away from the placement port, the sealing cover is covered on the liquid injection port after the liquid injection operation is finished 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 placing port, the sealing cover is not easily polluted by electrolyte when being closed, so that the sealing cover is easier to weld when being closed, and the welding seam efficiency is improved; meanwhile, the pressure of the sealing cover on the battery cell is small when the sealing cover is closed, so that the situation that electrolyte in the battery cell 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 is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is an exploded view of a steel-can button cell in one embodiment;
fig. 2 is a schematic structural view of the assembled steel-shell button cell shown in fig. 1;
fig. 3 is a schematic cross-sectional structure view of the steel-shell button cell shown in fig. 1;
fig. 4 is a schematic structural view of an automatic backflow structure in the steel-shell button cell shown in fig. 1;
fig. 5 is a schematic cross-sectional view of an automatic reflow structure in the steel-can button cell shown in fig. 1;
fig. 6 is a partially enlarged schematic view of the cross-sectional structure of the automatic reflow structure in the steel-can button cell shown in fig. 1.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. 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 "secured 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 as used herein are for illustrative purposes only and do not represent the only embodiments.
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. As used herein, the term "and/or" 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, one side of drain pan has been seted up and has been placed the mouth, the opposite side of drain pan has been seted up and has been annotated the liquid mouth, place the mouth with annotate the liquid mouth all with hold the intercommunication in chamber, it is less than to annotate liquid mouth diameter place a mouth diameter, the 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 button cell-type cell-top case 10 of an embodiment includes a top cover assembly 100, a cell assembly 200, a bottom case 300 and a sealing cover 400, wherein a containing cavity 312 is formed in the bottom case 300, a containing opening 314 is formed in one side of the bottom case 300, a liquid injection opening 316 is formed in the other side of the bottom case 300, the containing opening 314 and the liquid injection opening 316 are both communicated with the containing cavity 312, the diameter of the liquid injection opening 316 is smaller than that of the containing opening 314, the cell assembly 200 is placed in the containing cavity 312, the top cover assembly 100 is covered on the containing opening 314, and the sealing cover 400 is covered on the liquid injection opening 316.
The above-mentioned button cell battery 10 with a steel casing comprises a top cover assembly 100, a battery cell assembly 200, a bottom casing 300 and a sealing cover 400, wherein a containing cavity 312 is formed in the bottom casing 300, a placing opening 314 is opened at one side of the bottom casing 300, a liquid injection opening 316 is opened at the other side of the bottom casing 300, and the placing opening 314 and the liquid injection opening 316 are both communicated with the containing cavity 312. It can be understood that, among the present steel-shell button cell, the mouth of placing for placing electric core and annotate the liquid mouth is same opening, after electric core placed the casing from placing the mouth, carries out the injection of electrolyte from placing the mouth to electric core after that, annotates the liquid and locates the top cap lid after accomplishing again and place the mouth to carry out seal welding operation. However, when the cover is closed, because the top cover can cause an extrusion force to electric core, the electrolyte in the electric core appears climbing the limit or the condition that overflows after the pressurized to form the fog frost face on the box hat surface, the fog frost layer can be heated and evaporated and generate bubbles when the laser high temperature welding, and lead to the welding seam to appear rosin joint and the gas pocket is 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 case 300, and the problem of edge sticking of the electrolyte occurs. And place electric core subassembly 200's opening and annotate liquid mouth 316 non-same mouth in this application, make electric core subassembly 200 place the operation and annotate the liquid operation and can go on in steel-shell button cell 10's two places respectively, place electric core subassembly 200 behind holding chamber 312, need not to annotate the liquid and can weld top cap subassembly 100 in the mouth 314 of placing of drain pan 300, improve steel-shell button cell 10's leakproofness, then keep away from in the drain pan 300 again and place the liquid mouth 316 of annotating of mouth 314 one side and pour into electrolyte into, thereby can effectively prevent the weeping, and avoid electrolyte to remain on the steel-shell surface and to the harmful effects that sealing weld caused, and then improve steel-shell button cell 10's leakproofness. Further, the liquid filling port 316 is opened on the side of the bottom case 300 away from the placement port 314, the sealing lid 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-case 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 easily polluted by electrolyte when being closed, so that the sealing cover 400 is easier to weld when being closed, and the welding efficiency is improved; meanwhile, the pressure of the sealing cover 400 on the battery cell is small when the cover is closed, so that the situation that electrolyte in the battery cell 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 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 electrical core assembly 200, the first gasket 120 is stacked on a side of the case cap 130 facing away from the electrical core assembly 200, and the upper case 110 is stacked on a side of the first gasket 120 facing away from the case cap 130. It can be appreciated that after the cell assembly 200 is placed in the receiving cavity 312, the top cover assembly 100 can be welded to the placement opening 314 of the bottom case 300 without filling liquid, thereby improving the sealing performance of the steel-case button cell 10. However, if the sealing property of the top lid assembly 100 itself is poor, a problem of liquid leakage is likely to occur. In order to improve the sealing performance of the top cap assembly 100, in the present embodiment, the top cap assembly 100 includes an upper case 110, a first sealing gasket 120, and a case cap 130, the case cap 130 is connected to the electric core assembly 200, the first sealing gasket 120 is stacked on a side of the case cap 130 away from the electric core assembly 200, and the upper case 110 is stacked on a side of the first sealing gasket 120 away from the case cap 130. When the cap assembly 100 is welded to the placement opening 314 of the bottom chassis 300, the first gasket 120 can enhance the sealing property of the cap assembly 100, effectively preventing the electrolyte from leaking from the cap assembly 100. And first sealed 120 and shell cap 130 deviate from one side of electric core subassembly 200 and range upon range of, and upper shell 110 and one side that first sealed 120 deviates from shell cap 130 are range upon range of, and the steadiness that can press from both sides tightly and promote first sealed 120 through shell cap 130 and upper shell 110 to guarantee the sealed effect of first sealed 120, and then improve top cap subassembly 100's leakproofness.
Further, the housing cap 130 includes a main body 1320 and a protrusion 1340, the protrusion 1340 is connected to the main body 1320, and the first sealing pad 120 is sleeved on the protrusion 1340. It is understood that the first sealing gasket 120 is stacked on the side of the housing cap 130 away from the core assembly 200, and the upper housing 110 is stacked on the side of the first sealing gasket 120 away from the housing cap 130, so that the stability of the first sealing gasket 120 can be improved by clamping the housing cap 130 and the upper housing 110. However, the first gasket 120 is easily slid with respect to the housing cap 130 and the upper housing 110, and thus a gap is easily formed, which affects the sealability of the cap assembly 100. In order to further improve the stability of the first sealing gasket 120, in this embodiment, the housing cap 130 includes a main brim body 1320 and a protrusion 1340, the protrusion 1340 is connected to the main brim body 1320, the first sealing gasket 120 is sleeved on the protrusion 1340, and the first sealing gasket 120 is provided with a through hole, and the size of the through hole matches with the size of the protrusion 1340. When the top cover assembly 100 is closed, the visor main body 1320 can support the top cover assembly 100, the protrusion 1340 is sleeved on the first sealing gasket 120, and the protrusion 1340 can fix the first sealing gasket 120, so that the stability of the first sealing gasket 120 is further improved, and the sealing performance of the top cover assembly 100 is further improved.
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 gasket 420, one side of the second sealing gasket 420 is attached to the sealing cover 400, and one side of the second sealing gasket 420 facing away from the sealing cover main body 410 is covered on the pouring outlet 316. It is understood that, after the electrolyte injection is completed, the sealing cap 400 is placed on the injection port 316 to perform the operation of closing the sealing cap 400, and then laser welding is performed to seal the steel-shell button cell 10. However, when the sealing cap 400 is closed, electrolyte is likely to remain at the joint of the sealing cap 400 and the injection port 316, a frosted surface is formed on the surface of the case at the joint of the sealing cap 400 and the injection port 316 after the case is soaked in the electrolyte, and the frosted layer is heated and evaporated to generate bubbles during laser high-temperature welding, which causes cold welding and poor air holes in the welding line. In addition, electrolyte on the surface of the steel shell remains, and mixed gas is evaporated and released during laser high-temperature welding, so that the color of the surface of a welding seam is poor. In order to improve the sealing performance of the sealing cover 400 after the sealing cover 400 is closed, in this embodiment, the sealing cover 400 includes a sealing cover main body 410 and a second sealing gasket 420, one side of the second sealing gasket 420 is attached to the sealing cover 400, and one side of the second sealing gasket 420 departing 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 gasket 420 is covered above the liquid injection port 316, so that the second sealing gasket 420 seals the liquid injection port 316, and part of the second sealing gasket 420 is in contact with the electrolyte; because the second gasket 420 has better sealing performance, the electrolyte is not easy to overflow from the injection port 316 after the sealing cover 400 is closed. Since the second gasket 420 is made of a soft material, the structural strength of the second gasket 420 is weak, and the second gasket is easily damaged to cause leakage. Because the sealing cover 400 comprises the sealing cover main body 410 and the second sealing gasket 420, the sealing cover main body 410 is a hard shell, one side of the second sealing gasket 420 is attached to the sealing cover 400, and the side of the second sealing gasket 420 departing from the sealing cover main body 410 is covered on the liquid injection port 316. When sealed lid 400 closed, sealed lid main part 410 can play the support fixed action to the sealed 420 that fills of second to improve sealed lid 400's structural strength, sealed lid main part 410 can further extrude the sealed 420 that fills of second simultaneously, improves the sealed 420 of second and annotates the inseparability between liquid mouth 316, thereby improves the sealed effect of the sealed 420 that fills of second. In addition, laser welding can form the welding seam with the junction of sealed lid 400 and drain pan 300 to the gap between sealed lid 400 and the bottom is sealed completely in the shutoff, prevents the emergence of weeping condition effectively, and the second is sealed fills up 420 and can completely cut off the contact between electrolyte and the sealed lid main part 410 effectively, prevents that electrolyte from to the problem that laser welding caused the interference between sealed lid 400 and the drain pan 300, thereby improves laser welding's stability, and then improves steel-shelled button cell 10's leakproofness.
As shown in fig. 1, in one embodiment, the core assembly 200 includes a core 210, a positive tab 220 and a negative tab 230, the core 210 is connected to the positive tab 220 and the negative tab 230, respectively, 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, the bottom case 300 is provided with a positive electrode connecting portion, the top cover assembly 100 is provided with a negative electrode connecting portion, and after the battery cell assembly 200 is placed in the bottom case 300, the positive electrode tab 220 is connected to the positive electrode connecting portion, and the negative electrode tab 230 is connected to the negative electrode connecting portion, so that the core 210 can be respectively conducted 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, when the 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 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 improved.
In one embodiment, the core 210 is a wound or laminated cell. In the embodiment, the winding body battery cell has better high and low temperature performance, can work at-55 ℃ to 75 ℃, can normally start discharging and charging at-55 ℃, does not deform and swell when the battery is at high temperature of 80 ℃, and does not have the danger of explosion. Further, the spiral winding type is adopted in the winding body cell, and sulfuric acid is completely adsorbed by the winding body cell partition plate, so that no flowing liquid exists in the winding body steel shell button cell 10, liquid leakage does not occur even if the winding body steel shell button cell is inverted, and the leakage-proof effect of the steel shell button cell 10 is improved. The surface of the pole piece in the laminated cell is smooth, tension influence is avoided in the length direction, the pole piece and the diaphragm are in full contact, and therefore the consistency of interface reaction in the cell is improved.
In one embodiment, the bottom case 300 is provided with an automatic backflow structure, and the liquid injection port 316 is opened in the automatic backflow structure. In this embodiment, the automatic backflow structure is step-shaped, that is, there is a height difference between the automatic backflow structure and the plane where the liquid injection port 316 is located, and even if the electrolyte overflows from the liquid injection port 316, the automatic backflow structure can also enable the overflowing electrolyte to flow back into the casing, so as to effectively prevent the electrolyte in the casing from creeping into the casing, so that the overflowing electrolyte cannot reach the sealing cover 400, thereby improving the neatness of the sealing cover 400 and the stability of the sealing and welding of the steel-shell button cell 10. Further, when sealing lid 400 closes the lid, sealing lid 400 is connected with automatic backflow structure, makes automatic backflow structure can prevent sealing lid 400 when closing the lid with annotate the electrolyte contact of liquid mouth 316, can prevent that sealing lid 400 from sliding into the casing and taking electrolyte out when the assembly to further improve the clean and tidy nature of sealing lid 400 department, further improve steel-shelled button cell 10 seal welding's stability.
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 disposed on the liquid injection portion 7144, and the sealing cover plate 720 is connected to 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 to the sealing housing 712, the inverted housing 714 is provided with an automatic backflow step 7142 and an injection part 7144, the injection part 7144 is connected to the automatic backflow step 7142, the injection part 7144 is provided with an injection port 7146, the injection port 7146 is used for injecting electrolyte, and the electrolyte is injected or discharged through the automatic backflow step 7142; further, a sealing cover plate 720 is provided to cover the liquid injection portion 7144, and the sealing cover plate 720 is connected to the automatic backflow step 7142. Because the step-shaped structure of the automatic backflow step 7142, namely the height difference exists between the plane where the automatic backflow step 7142 and the liquid injection port 7146 are located, even if electrolyte overflows from the liquid injection port 7146, the automatic backflow step 7142 can also enable the overflowing electrolyte to flow back into the shell 710, so that the electrolyte in the shell 710 is effectively prevented from climbing, the overflowing electrolyte cannot reach the sealing cover plate 720, the tidiness of the sealing cover plate 720 is improved, and the stability of the sealing welding of the steel shell button cell is improved. Furthermore, the automatic backflow step 7142 not only can effectively prevent electrolyte in the housing 710 from creeping, 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 sealed apron 720 lid is located notes liquid portion 7144, sealed apron 720 is connected with automatic backward flow step 7142, makes automatic backward flow step 7142 can prevent that sealed apron 720 from closing the electrolyte contact of lid time with annotating liquid mouth 7146, can prevent promptly that sealed apron 720 from sliding into in the casing 710 and taking electrolyte out when the assembly to further improve the clean and tidy nature of sealed apron 720 department, further improve the sealed welded stability of steel-shelled button cell.
As shown in fig. 5 and 6, in one embodiment, the self-reflow structure 700 further includes a gasket 730, and the gasket 730 is attached to the self-reflow step 7142. It can be understood that, although the overflowed electrolyte can flow back into the case 710 when passing through the automatic backflow step 7142 due to the step-like 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, a small amount of electrolyte is likely to remain on the surface of the automatic backflow step 7142 after the electrolyte flows back into the case 710. In order to prevent that sealed apron 720 is infected with remaining electrolyte when closing the lid, in this embodiment, automatic backflow structure 700 still includes sealed pad 730, sealed pad 730 laminates in automatic backward flow step 7142, sealed pad 730 can play better isolated and sealed effect to electrolyte to sealed apron 720 is infected with remaining electrolyte when closing the lid, guarantees the clean and tidy nature after sealed apron 720 closes the lid, and then improves steel-shelled button cell seal welding's stability. In addition, the sealing gasket 730 can also play a better insulating role, thereby improving the performance stability of the steel-shell button cell.
Further, the gasket 730 has a larger orthographic area than the liquid injection part 7144. It can be understood that sealed pad 730 can play better isolated and sealed effect to electrolyte to sealed apron 720 is infected with remaining electrolyte when closing the lid, guarantees the clean and tidy nature of sealed apron 720 after closing the lid, and then improves steel-shelled button cell seal welding's stability. In addition, the gasket 730 can also perform a better insulating function. In order to further improve the adhesion tightness between the gasket 730 and the automatic backflow structure 7142 and prevent leakage of the electrolyte, in the present embodiment, the orthographic area of the gasket 730 is larger than the orthographic area 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 automatic backflow structure 700.
Further, the sealing cap plate 720 is half-wrapped in the sealing gasket 730. It can be understood that the sealing cover plate 720 covers the liquid injection portion 7144, the sealing cover plate 720 is connected to the self-reflow step 7142, and if the sealing cover plate 720 directly contacts the self-reflow step 7142, the edge of the sealing cover plate 720 is easily contaminated by the overflowing electrolyte. 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-wrapped in the sealing gasket 730, so as to avoid the direct contact between the sealing cover plate 720 and the dynamic return 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 and taking out the electrolyte when the sealing cover plate is closed, thereby improving the safety of the sealing cover plate 720 when the sealing cover plate is closed. In addition, the sealing cover plate 720 is half wrapped in the sealing gasket 730, and the sealing gasket 730 can also play a good buffering role on the sealing cover plate 720, so that the stability of the automatic backflow 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 is understood that after the sealing cover plate 720 is covered on the liquid filling part 7144, a groove is formed between the circumference of the sealing cover plate 720 and the sealing housing 712. In order to improve the sealing performance and the insulating performance at the sealing cover plate 720, in this embodiment, the automatic backflow 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 backflow step 7142, the automatic backflow step 7142 is connected with the sealing housing 712, and the sealing hot-melt rubber ring 740 can improve the sealing performance between the sealing cover plate 720 and the automatic backflow step 7142 and improve the sealing performance between the sealing cover plate 720 and the sealing housing 712. In addition, the sealing hot-melt rubber ring 740 has good insulation performance, and the sealing cover plate 720 and the automatic backflow step 7142 are sleeved with the sealing hot-melt rubber ring 740, so that the insulation performance of the automatic backflow structure 700 can be effectively improved.
In one embodiment, the height of the auto-reflow step 7142 is equal to the sum of the height of the sealing cover 720 and the height of the gasket 730. It can be understood that the automatic backflow step 7142 not only can effectively prevent electrolyte in the case 710 from creeping, so that the overflowed electrolyte cannot reach the sealing cover plate 720, but also the automatic backflow step 7142 can also serve as a pressure-bearing step of the sealing cover plate 720. Because sealed apron 720 lid is located notes liquid portion 7144, sealed apron 720 is connected with automatic backward flow step 7142, makes automatic backward flow step 7142 can prevent that sealed apron 720 from closing the electrolyte contact of lid time with annotating liquid mouth 7146, can prevent promptly that sealed apron 720 from sliding into in the casing 710 and taking electrolyte out when the assembly to further improve the clean and tidy nature of sealed apron 720 department, further improve the sealed welded stability of steel-shelled button cell. However, if the sealing cover plate 720 is disposed on the liquid injection part 7144 and then the sealing cover plate 720 is higher than the sealing case 712 or lower than the sealing case 712, the steel-case button cell case 710 is not flat. In order to improve the flatness of the steel-casing button cell housing 710, in the embodiment, the height of the automatic backflow step 7142 is the same as the sum of the heights of the sealing cover plate 720 and the gasket 730, so that the sealing cover plate 720 is covered on the liquid injection part 7144, that is, the sealing cover plate 720 and the sealing housing 712 are in the same plane after the sealing cover plate is covered, thereby effectively improving the flatness of the steel-casing button cell housing 710.
In one embodiment, the angle of inclination of the auto-reflow step 7142 is 20 to 80 degrees. It can be understood that, due to the step-shaped 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 also enable the overflowing electrolyte to flow back into the shell 710, so that the electrolyte in the shell 710 is effectively prevented from creeping, the overflowing electrolyte cannot reach the sealing cover plate 720, the tidiness of the sealing cover plate 720 is improved, and the stability of the sealing welding of the steel shell button cell is improved. However, if the inclination angle of the automatic backflow step 7142 is too small, the liquid-climbing prevention effect is likely to fail; if the inclination angle of the automatic backflow step 7142 is too large, the area of the automatic backflow step 7142 is easily small, the pressure bearing effect is poor, and the closing of the sealing cover plate 720 is not facilitated. In order to improve the anti-creeping liquid 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 good anti-creeping liquid effect, and meanwhile, the inclination angle of 20-80 degrees can enable the opening direction area of the automatic backflow step 7142 to be larger than the area of the sealing cover plate 720, thereby being beneficial to the cover closing of the sealing cover plate 720, and being beneficial to improving the pressure bearing effect of the automatic backflow step 7142 on the sealing cover plate 720.
In one embodiment, the diameter of the sealing cap plate 720 is 3mm to 4 mm. It can be understood that the sealing cover plate 720 of the liquid filling port 7146 of the existing steel-shell button cell has a diameter of 12mm, the length of the sealing welding bead after liquid filling is 38mm, the sealing welding bead is long, which easily prolongs the process time, and the shell 710 has long welding heating time, which easily heats the electrolyte to generate bubbles, thereby affecting the performance of the steel-shell button cell. In order to optimize the length of the sealing weld bead after the liquid injection of the automatic backflow structure 700, shorten the heating time and reduce bubbles generated by heating the electrolyte, in the embodiment, the diameter of the sealing cover plate 720 is 3 mm-4 mm, compared with the length of the sealing weld bead after the liquid injection of the existing steel shell button cell, the length of the sealing weld bead after the liquid injection is shortened from 37.8mm to 11mm, and the length of the sealing weld bead is reduced by 26.8 mm; the welding heating time is shortened from 8.5S/PCS to 3.5S/PCS, and the welding time is shortened 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 backflow structure 700 during sealing is further improved.
In one embodiment, the sealing cover plate 720 includes a cover plate body and an anti-adhesive liquid layer coupled to the cover plate body. It is understood that a sealing cover plate 720 is provided to cover the liquid injection part 7144, and the sealing cover plate 720 is connected to the self-refluxing step 7142. Due to the step-shaped 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 overflowing electrolyte to flow back into the shell 710. However, after the electrolyte flows back into the case 710, a residual part of the electrolyte is easily adhered to the sealing cover plate 720, so that a small amount of electrolyte is easily overflowed, and the welding of the steel-shell button cell is affected. In order to prevent the electrolyte from flowing back into the case 710, a small amount of the electrolyte still remains to be adhered to the sealing cover plate 720, in the present embodiment, the sealing cover plate 720 includes a cover plate main body and an anti-sticking liquid layer connected to the cover plate main body, and the anti-sticking liquid layer can effectively prevent the electrolyte from being adhered to the sealing cover plate 720, thereby further improving the anti-creeping 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 gasket 500, and the first insulating gasket 500 is installed between the cell assembly 200 and the bottom can 300. It can be understood that the battery cell is easy to contact with the tab and the steel shell to generate friction when the battery cell shrinks in the repeated charging and discharging process, and the abnormal damage condition of the diaphragm can be generated by vibration and impact in the use 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, the first insulating gasket 500 is installed between the cell assembly 200 and the bottom shell 300, so as to eliminate the friction generated by the contact between the cell and the negative electrode tab 230 and the bottom shell 300 when the cell shrinks in the repeated charging and discharging process, and the damage to the diaphragm caused by the shock impact of the steel-shell button cell 10 in the using process, thereby effectively prolonging the service life of the steel-shell button cell 10, and ensuring the performance stability of the steel-shell button cell 10 under extreme conditions such as shock impact.
As shown in fig. 1 and 3, in one embodiment, the steel-can button cell 10 further includes a second insulating gasket 600, and the second insulating gasket 600 is installed between the core assembly 200 and the top cap assembly 100. It can be understood that the battery cell is easy to contact with the tab and the steel shell to generate friction when the battery cell shrinks in the repeated charging and discharging process, and the abnormal damage condition of the diaphragm can be generated by vibration and impact in the use process. In order to improve the structural stability of the steel-casing button cell 10 in the charging and discharging processes, in this embodiment, the steel-casing button cell 10 further includes a second insulating gasket 600, and the second insulating gasket 600 is installed between the cell assembly 200 and the top cover assembly 100, so as to eliminate the friction generated by the contact between the cell and the positive electrode tab 220 and the contact between the cell and the top cover assembly 100 when the cell shrinks in the repeated charging and discharging process, and the damage to the diaphragm caused by the shock impact on the steel-casing button cell 10 in the using process, thereby effectively prolonging the service life of the steel-casing button cell 10, and ensuring the performance stability of the steel-casing button cell 10 under extreme conditions such as shock impact.
As shown in fig. 2, in one embodiment, the bottom chassis 300 is provided with a two-dimensional code area 310. In this embodiment, the two-dimensional code can be sprayed in the two-dimensional code area 310 of the bottom case 300, the two-dimensional code can distinguish the steel-case button cell 10, and the two-dimensional code has high-density codes, and has a large information capacity, a wide coding range and strong fault-tolerant capability, and has the advantages of error correction function and high decoding reliability, and the steel-case button cell 10 can be identified and recorded by the two-dimensional code, so that a refined production mode of two-dimensional code scanning management can be adopted in the process of the steel-case button cell 10, and the test and inspection data of each link in the process can be automatically stored in the MES system after scanning the code, thereby improving the reliability of each performance index output of each finished steel-case button cell 10, and simultaneously improving the production efficiency and the yield.
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 component 100, a cell component 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, the liquid injection port 316 is communicated with one side of the containing cavity 312 far away from the placing port 314, namely, the opening for placing the cell component 200 and the liquid injection port 316 are not the same port, so that the placing operation and the liquid injection operation of the cell component 200 can be respectively carried out at two positions of the steel-shell button cell 10, after the cell component 200 is placed in the containing cavity 312, the top cover component 100 can be welded at the placing port 314 of the bottom shell 300 without liquid injection, the sealing performance of the steel-shell cell 10 is improved, then the electrolyte is injected through the liquid injection port 316 far away from the placing port 314 in the bottom shell 300, thereby effectively preventing liquid leakage and avoiding the adverse effect on the sealing welding caused by the residual electrolyte on the surface of the steel shell, thereby improving the sealing performance of the steel-shell button cell 10.
2. The liquid injection port 316 of the steel-shell button cell 10 is arranged on one side of the bottom shell 300 far away from the placing port 314, the sealing cover 400 is covered on the liquid injection port 316 after the liquid injection operation is finished through the liquid injection port 316, and the liquid injection 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 easily polluted by electrolyte when being closed, so that the sealing cover 400 is easier to weld when being closed, and the welding efficiency is improved; meanwhile, the pressure of the sealing cover 400 on the battery cell is small when the cover is closed, so that the situation that electrolyte in the battery cell 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 above examples only show some embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. The utility model provides a steel-shelled button cell, its characterized in that, includes top cap subassembly, electric core subassembly, drain pan and sealed lid, be formed with in the drain pan and hold the chamber, one side of drain pan has been seted up and has been placed the mouth, the opposite side of drain pan has been seted up and has been annotated the liquid mouth, place the mouth with annotate the liquid mouth all with hold the chamber intercommunication, it is less than to annotate liquid mouth diameter place a diameter, the 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.
2. The steel-shell button cell according to claim 1, wherein the top cover assembly comprises an upper shell, a first sealing gasket and a shell cap, the shell cap is connected with the cell assembly, the upper shell, the first sealing gasket and the shell cap are sequentially stacked, and the first sealing gasket is located on one side of the shell cap departing from the cell assembly.
3. The steel-shelled button cell according to claim 2, characterized in that the case cap comprises a cap peak main body and a protrusion, the protrusion is connected with the cap peak main body, and the first sealing gasket is sleeved on the protrusion.
4. The steel-shell button cell according to 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.
5. The steel-shell button cell according to claim 1, wherein the cell assembly comprises a core, a positive tab and a negative tab, the core is connected with the positive tab and the negative tab respectively, the positive tab is connected with the top cover assembly, and the negative tab is connected with the bottom shell.
6. The steel-can button cell according to claim 5, characterized in that the core is a wound or laminated cell.
7. The button steel-shell battery according to claim 1, wherein the bottom shell is provided with an automatic backflow structure, and the liquid injection port is opened in the automatic backflow structure.
8. The steel-shelled button cell according to claim 1, further comprising a first insulating gasket mounted between the cell assembly and the bottom shell.
9. The steel can button cell of claim 1, further comprising a second insulating gasket mounted between the core assembly and the cap assembly.
10. The steel-shelled button cell according to claim 1, characterized in that the bottom shell is provided with a two-dimensional code area.
CN202111146742.1A 2021-09-28 Steel shell button cell Active CN113809486B (en)

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