CN113363635A - Button-type battery and method for manufacturing the same - Google Patents

Button-type battery and method for manufacturing the same Download PDF

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Publication number
CN113363635A
CN113363635A CN202110532672.7A CN202110532672A CN113363635A CN 113363635 A CN113363635 A CN 113363635A CN 202110532672 A CN202110532672 A CN 202110532672A CN 113363635 A CN113363635 A CN 113363635A
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China
Prior art keywords
battery
welding
cup
cover
rubber ring
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CN202110532672.7A
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Chinese (zh)
Inventor
童焰
陈志勇
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Guangdong Mic Power New Energy Co Ltd
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Guangdong Mic Power New Energy Co Ltd
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Application filed by Guangdong Mic Power New Energy Co Ltd filed Critical Guangdong Mic Power New Energy Co Ltd
Priority to CN202110532672.7A priority Critical patent/CN113363635A/en
Publication of CN113363635A publication Critical patent/CN113363635A/en
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10Primary casings, jackets or wrappings of a single cell or a single battery
    • H01M50/102Primary casings, jackets or wrappings of a single cell or a single battery characterised by their shape or physical structure
    • H01M50/109Primary casings, jackets or wrappings of a single cell or a single battery characterised by their shape or physical structure of button or coin shape
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/04Construction or manufacture in general
    • H01M10/0422Cells or battery with cylindrical casing
    • H01M10/0427Button cells
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10Primary casings, jackets or wrappings of a single cell or a single battery
    • H01M50/147Lids or covers
    • H01M50/148Lids or covers characterised by their shape
    • H01M50/153Lids or covers characterised by their shape for button or coin cells
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10Primary casings, jackets or wrappings of a single cell or a single battery
    • H01M50/147Lids or covers
    • H01M50/166Lids or covers characterised by the methods of assembling casings with lids
    • H01M50/169Lids or covers characterised by the methods of assembling casings with lids by welding, brazing or soldering
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10Primary casings, jackets or wrappings of a single cell or a single battery
    • H01M50/183Sealing members
    • H01M50/184Sealing members characterised by their shape or structure
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10Primary casings, jackets or wrappings of a single cell or a single battery
    • H01M50/183Sealing members
    • H01M50/186Sealing members characterised by the disposition of the sealing members
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50Current conducting connections for cells or batteries
    • H01M50/531Electrode connections inside a battery casing
    • H01M50/536Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M6/00Primary cells; Manufacture thereof
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50Manufacturing or production processes characterised by the final manufactured product

Abstract

The button cell and the manufacturing method thereof of the invention are provided with a packaging assembly and a cell winding core. In the practical application process, the battery cup and the battery cover both play a role in protection, and the sealing rubber ring plays a role in sealing and waterproofing; in addition, when the pole lug needs to be welded, the position of the pole lug is positioned, and resistance welding operation is carried out on the battery cup and/or the battery cover, so that the pole lug of the battery roll core at the central position and the battery cup and/or the contact part of the battery cover are subjected to resistance welding to form a central welding layer, the pole lug of the battery roll core at the edge position and the contact part of the battery cup and/or the battery cover are subjected to resistance welding to form an edge welding layer, the phenomenon of 'explosive welding' of the pole lug can be prevented due to the existence of the central welding layer and the edge welding layer, the welding stability of the pole lug is greatly improved, compared with the traditional laser welding mode, the welding safety coefficient is higher, and the risk that the battery cup or the battery cover is directly punctured by laser is avoided.

Description

Button-type battery and method for manufacturing the same
Technical Field
The invention relates to the technical field of batteries, in particular to a button-type battery and a manufacturing method thereof.
Background
Currently, a battery refers to a device that converts chemical energy into electrical energy in a portion of the space of a cup, tank, or other container or composite container that holds an electrolyte solution and metal electrodes to generate an electric current. Has a positive electrode and a negative electrode. With the advancement of technology, batteries generally refer to small devices, such as solar cells, that can generate electrical energy. The performance parameters of the battery are mainly electromotive force, capacity, specific energy and resistance. The battery is used as an energy source, can obtain current which has stable voltage and current, is stably supplied for a long time and is slightly influenced by the outside, has simple structure, convenient carrying, simple and easy charging and discharging operation, is not influenced by the outside climate and temperature, has stable and reliable performance, and plays a great role in various aspects of modern social life.
The button-type battery structure comprises a battery cover, a battery shell and a battery roll core, and after the button-type battery structure is assembled, the tab of the battery roll core, the battery cover and the battery shell are required to be welded. However, most of the existing tab welding methods adopt the laser welding function, and the tab and the battery cover or the battery case are welded together at the moment when the laser emits laser by utilizing the laser to align the center position of the battery cover or the battery case. Although the welding of the tab by laser welding can be performed quickly and efficiently, there are some drawbacks. Firstly, a single-point welding mode is utilized in a laser welding mode, the position of a lug of a battery roll core needs to be positioned before formal laser welding, if the position of the lug is not accurately positioned, the lug can generate a 'welding explosion' phenomenon, namely the lug is not welded with a battery cover or a battery case in a true sense, and the connection stability is poor; secondly, the mode of laser welding, because the mode of laser welding is from outside to inside welding mode, if when welding utmost point ear, the location to utmost point ear is inaccurate, and laser is in the one-time that sends laser, and the battery cover or battery case direct breakdown are easily penetrated to laser, and inside the battery roll core, there is considerable potential safety hazard in laser direct injection.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a button type battery which can prevent the 'explosive welding' phenomenon of a tab, has strong welding stability and high welding safety coefficient and a manufacturing method thereof.
The purpose of the invention is realized by the following technical scheme:
a button-type battery comprising:
the sealing rubber ring is sleeved in the battery cup, the battery cover is clamped in the sealing rubber ring, the battery cover is used for supporting the sealing rubber ring so that the sealing rubber ring is tightly contacted with the inner side wall of the battery cup, the battery cup and the battery cover jointly enclose a battery inner cavity, and a welding layer is arranged on the battery cup and/or the battery cover; and
the battery winding core is arranged in the battery inner cavity and provided with a lug;
wherein the welding layer is formed by resistance welding of the contact part of the tab of the battery winding core and the battery cup and/or the battery cover.
In one embodiment, the weld layer includes a central weld layer and an edge weld layer, the central weld layer is formed by resistance welding of a tab of the cell core at a central position with a contact portion of the cell cup and/or the cell cover, and the edge weld layer is formed by resistance welding of a tab of the cell core at an edge position with a contact portion of the cell cup and/or the cell cover.
In one embodiment, the central welding layer is formed by resistance welding a contact portion of the tab of the cell winding core at the central position and the cell cup, and the edge welding layer is formed by resistance welding a contact portion of the tab of the cell winding core at the edge position and the cell cup.
In one embodiment, the central welding layer is formed by resistance welding of a contact portion of the battery cover and a tab of the battery core at a central position, and the edge welding layer is formed by resistance welding of a contact portion of the battery cover and a tab of the battery core at an edge position.
In one embodiment, the central welding layer is formed by resistance welding of a tab of the battery core at a central position to contact portions of the battery cup and the battery cover, and the edge welding layer is formed by resistance welding of a tab of the battery core at an edge position to contact portions of the battery cup and the battery cover.
In one embodiment, the center layer and the edge layer are each in the shape of a dot.
In one embodiment, the edge weld layer is annular.
In one embodiment, the rim layer is disk shaped.
In one embodiment, the edge weld layer includes a plurality of fanning weld layers, each of the fanning weld layers having a fan shape.
A method of manufacturing a button-type battery, comprising the steps of:
step S01, providing a packaging assembly and a battery winding core for manufacturing the button-type battery, wherein the packaging assembly comprises a battery cup, a sealing rubber ring and a battery cover;
step S02, placing a sealing rubber ring in the battery cup, placing the battery roll core in the battery cup, clamping the battery cover in the sealing rubber ring, and supporting the sealing rubber ring by the battery cover so that the sealing rubber ring is tightly contacted with the inner side wall of the battery cup, wherein the battery cup and the battery cover together enclose a battery inner cavity, and the battery roll core is positioned in the battery inner cavity;
s03, positioning the tab position of the battery winding core, and performing resistance welding operation on the battery cup and/or the battery cover by using a double-needle welding head;
and the contact part of the lug of the battery winding core and the battery cup and/or the battery cover is subjected to resistance welding to form a welding layer.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the button cell and the manufacturing method thereof of the invention are provided with a packaging assembly and a cell winding core. In the practical application process, the battery cup and the battery cover both play a role in protection, and the sealing rubber ring plays a role in sealing and waterproofing; in addition, when the pole lug needs to be welded, the position of the pole lug is positioned, and the electric welding operation is carried out on the battery cup and/or the battery cover, so that the pole lug of the battery roll core at the central position and the battery cup and/or the contact part of the battery cover are subjected to electric resistance welding to form a central welding layer, the pole lug of the battery roll core at the edge position and the contact part of the battery cup and/or the battery cover are subjected to electric resistance welding to form an edge welding layer, the phenomenon of 'explosive welding' of the pole lug can be prevented due to the existence of the central welding layer and the edge welding layer, the welding stability of the pole lug is greatly improved, compared with the traditional laser welding mode, the welding safety coefficient is higher, and the risk that the battery cup or the battery cover is directly punctured by laser is avoided.
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 a flow chart illustrating steps of a button cell manufacturing method according to an embodiment of the present invention;
fig. 2 is a schematic view of the internal structure of a button cell according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of the button cell and the dual-pin welding head in the resistance welding process according to one embodiment of the present invention;
FIG. 4 is a schematic diagram of the button cell and the dual-pin welding head in the resistance welding process according to another embodiment of the invention;
FIG. 5 is a schematic view of a center layer and an edge layer according to an embodiment of the invention;
FIG. 6 is a schematic view of a center layer and an edge layer according to another embodiment of the present invention;
FIG. 7 is a schematic view of a center layer and an edge layer according to another embodiment of the invention.
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 existing tab welding mode mostly adopts the action of laser welding, a laser is aligned to the center position of the battery cover or the battery case, and the tab and the battery cover or the battery case are welded together at the moment when the laser emits laser. Although the welding of the tab by laser welding can be performed quickly and efficiently, there are some drawbacks. Firstly, a single-point welding mode is utilized in a laser welding mode, the position of a lug of a battery roll core needs to be positioned before formal laser welding, if the position of the lug is not accurately positioned, the lug can generate a 'welding explosion' phenomenon, namely the lug is not welded with a battery cover or a battery case in a true sense, and the connection stability is poor; secondly, the mode of laser welding, because the mode of laser welding is from outside to inside welding mode, if when welding utmost point ear, the location to utmost point ear is inaccurate, and laser is in the one-time that sends laser, and the battery cover or battery case direct breakdown are easily penetrated to laser, and inside the battery roll core, there is considerable potential safety hazard in laser direct injection.
Therefore, in view of the above problems, referring to fig. 1 and fig. 2 together, the present application discloses a method for manufacturing a button cell, comprising the following steps:
step S01, providing a packaging assembly 100 and a battery core 200 for manufacturing the button cell 10, wherein the packaging assembly 100 comprises a battery cup 110, a sealing rubber ring 120 and a battery cover 130.
As such, it should be noted that the packaging assembly 100 functions to package and protect the battery roll core 200; the battery roll core 200 functions to supply voltage, outputting the voltage to an external power consumption device.
Step S02, the sealing rubber ring 120 is sleeved in the battery cup 110, the battery roll core 200 is placed in the battery cup 110, the battery cover 130 is clamped in the sealing rubber ring 120, the battery cover 130 supports the sealing rubber ring 120, so that the sealing rubber ring 120 is tightly contacted with the inner side wall of the battery cup 110, at this time, the battery cup 110 and the battery cover 130 jointly enclose a battery cavity, and the battery roll core 200 is located in the battery cavity.
Thus, it should be noted that, when the button-type battery 10 is assembled, the sealing rubber ring 120 is sleeved in the battery cup 110, the battery winding core 200 is placed in the battery cup 110, and the battery cover 130 is clamped in the sealing rubber ring 120, under this condition, the battery cover 130 will support the sealing rubber ring 120, and under the supporting force of the battery cover 130, the sealing rubber ring 120 will be in tight contact with the inner side wall of the battery cup 110, that is, the sealing rubber ring 120 is tightly attached to the battery cup 110 and the battery cover 130, so that the sealing waterproof performance of the sealing rubber ring 120 is greatly improved; meanwhile, the sealing rubber ring 120 can provide a proper friction force to the cell cover 130, so that the cell cover 130 is prevented from being separated from the cell cup 110 under a certain external force, and the electrolyte of the cell winding core 200 is prevented from leaking.
Step S03, positioning the tab 210 position of the battery winding core 200, and performing resistance welding operation on the battery cup 110 and/or the battery cover 130 by using the double-needle welding head 20;
wherein, the contact part of the tab 210 of the battery winding core 200 and the battery cup 110 and/or the battery cover 130 is resistance-welded to form a welding layer;
specifically, the welding layers include a central welding layer 140 formed by resistance welding of a tab of the cell core at a central position to the cell cup and/or a contact portion of the cell cover, and an edge welding layer 150 formed by resistance welding of a tab of the cell core at an edge position to the cell cup and/or the contact portion of the cell cover.
As described above, in the conventional tab welding method, a laser welding method is often used, and after the tab position of the battery winding core is confirmed, a laser is aligned with the center position of the battery cover or the battery case, and the tab and the battery cover or the battery case are welded together at the moment when the laser emits laser light. The method has certain defects, firstly, the position of the lug of the battery roll core needs to be positioned, and if the position of the lug is not accurately positioned, the lug can generate a 'welding-explosion' phenomenon, namely the lug is not welded with the battery cover or the battery case in the true sense, and the connection stability is poor; secondly, if when welding the tab, the positioning of the tab is inaccurate, the laser can easily directly break down the battery cover or the battery case at the moment when the laser emits the laser, and the laser is directly emitted into the battery roll core, so that a great potential safety hazard exists.
Therefore, in view of the above problems, the present application adopts a resistance welding method, specifically, after the package assembly 100 and the battery core 200 are assembled, the position of the tab 210 of the battery core 200 is located, and the dual-pin welding head 20 is used to perform a resistance welding operation on the battery cup 110 and/or the battery cover 130, please refer to fig. 2, fig. 3 and fig. 4 together, the dual-pin welding head 20 includes a positive welding head 21 and a negative welding head 22, after the position of the tab 210 of the battery core 200 is located, the positive welding head 21 is aligned with the tab at the central position of the battery cup 110 and/or the battery cover 130, the negative welding head 22 is aligned with the tab at the edge position of the battery cup 110 and/or the battery cover 130, of course, the positive welding head 21 and the negative welding head 22 can be interchanged with the actual assembly condition, that is, the negative welding head 22 is aligned with the tab at the central position of the battery cup 110 and/or the battery cover 130, the positive welding head 21 is aligned with the tab at the edge position of the battery cup 110 and/or the battery cover 130, at the moment when the two-pin welding head 20 is electrified, a conductive path is formed among the positive welding head 21, the battery cup 110 and the negative welding head 22 or among the positive welding head 21, the battery cover 130 and the negative welding head 22, the tab 210 is subjected to resistance welding operation, so that the central welding layer 140 is formed by resistance welding of the contact part of the tab 210 at the central position of the battery winding core 200 and the battery cup 110 and/or the battery cover 130, and the edge welding layer 150 is formed by resistance welding of the contact part of the tab 210 at the edge position of the battery winding core 200 and the battery cup 110 and/or the battery cover 130. It should be emphasized that the formation of the central welding layer 140 and the edge welding layer 150 can make the connection stability between the tab 210 of the battery roll core 200 and the battery cup 110 and/or the battery cover 130 stronger, and compared with the conventional laser single-point welding, the present application can make the tab 210 welded more stably, and can well prevent the tab 210 from being welded by explosion when the position of the tab 210 is not accurately positioned, that is, the tab 210 cannot be successfully welded with the battery cup 110 and/or the battery cover 130; in addition, due to the formation of the central welding layer 140 and the edge welding layer 150, when the position of the tab 210 is positioned, compared with the traditional laser single-point welding, the position of the tab 210 does not need to be accurately positioned, and the welding operation of the tab 210 is completed by covering a large area of the central welding layer 140 and the edge welding layer 150 on the battery cup 110 and/or the battery cover 130; in addition, in the conventional laser welding, the laser welding is an external-to-internal welding operation, that is, at a moment when the laser emits the laser, the laser slowly penetrates through the cell cup 110 and/or the cell cover 130 to the tab 210 to form a welding bead, the welding bead slowly transits from the cell cup 110 and/or the cell cover 130 to the tab 210 to join with the tab 210, that is, the laser welds the tab 210 from the outside to the inside, if the positioning of the tab is not accurate, the laser easily breaks down the cell cover 130 or the cell cup 110 directly at a moment when the laser emits the laser, the laser directly injects into the interior of the cell 200, there is a considerable safety hazard, and in the present application, a conductive path is formed between the positive welding head 21, the cell cup 110 and the negative welding head 22 or between the positive welding head 21, the cell cover 130 and the negative welding head 22, and at a moment when the double-needle welding head 20 is energized, the tab 210 located at the center position is welded with the cell cup 110 and/or the cell cover 130, compared with a welding bead formed by traditional laser welding, the central welding layer 140 and the edge welding layer 150 are welded together at the contact part of the lug and the battery cup 110 and/or the battery cover 130 at the moment of electrification, the welding layers gradually diffuse to the periphery along with the length of the electrification time, namely the area of the welding layers gradually increases along with the extension of the electrification time, and the welding stability between the welding layers and the lug 210 is enhanced by increasing the welding area of the welding layers and the lug 210; simultaneously, because the change of welding layer is by the center to diffusing all around, compare in traditional laser welding by outer and in, this application can be fine prevent when utmost point ear 210's position location is inaccurate, laser direct puncture battery cup 110 and/or battery cover 130 jet into inside the battery rolls up core 200, lead to battery to roll up core 200 and explode, arouse corresponding incident, and this application can finely stop the emergence of above-mentioned condition, utilize the welding layer of diffusion all around, accomplish the welding operation to utmost point ear 210, need not laser and pierce through battery cup 110 and/or battery cover 130 and can accomplish the welding operation to utmost point ear 210, this application is not by outer and interior welding process, but welding process from interior to exterior, factor of safety improves greatly.
According to the above method for manufacturing a button cell, a button cell 10 as shown in fig. 2 can be manufactured, and the button cell 10 includes a package assembly 100 and a cell roll core 200.
As such, it should be noted that the packaging assembly 100 functions to package and protect the battery roll core 200; the battery roll core 200 functions to supply voltage, outputting the voltage to an external power consumption device.
Referring to fig. 2 again, the package assembly 100 includes a battery cup 110, a sealing rubber ring 120 and a battery cover 130, the sealing rubber ring 120 is sleeved in the battery cup 110, the battery cover 130 is clamped in the sealing rubber ring 120, the battery cover 130 is used for supporting the sealing rubber ring 120, so that the sealing rubber ring 120 is tightly contacted with the inner side wall of the battery cup 110, the battery cup 110 and the battery cover 120 together enclose a battery cavity, and a solder layer is disposed on the battery cup 110 and/or the battery cover 130.
Specifically, the welding layers include a center welding layer 140 formed by resistance welding of a contact portion of a tab of the battery core at a center position with the battery cup and/or the battery cover, and an edge welding layer 150 formed by resistance welding of a contact portion of a tab of the battery core at an edge position with the battery cup and/or the battery cover.
Therefore, it should be noted that the battery cup 110 and the battery cover 130 both play a role in packaging protection, the battery cup 110 and the battery cover 130 jointly enclose a battery inner cavity, the battery inner cavity is used for placing the battery roll core 200, and the battery cup 110 and the battery cover 130 can prevent an external object from directly making too large physical contact with the battery roll core 200, so as to damage the battery roll core 200; the sealing rubber ring 120 plays a role in sealing and waterproofing, and can prevent conductive media in a liquid state such as external water drops from permeating into the battery cup 110, so that the battery winding core 200 is short-circuited.
Referring to fig. 2 again, the battery roll core 200 is disposed in the battery cavity, and the tab 210 is disposed on the battery roll core 200; wherein: the center weld layer 140 is formed by resistance welding the tab 210 of the cell core 200 at the center position to the contact portion of the cell cup 110 and/or the cell cover 130, and the edge weld layer 150 is formed by resistance welding the tab 210 of the cell core 200 at the edge position to the contact portion of the cell cup 110 and/or the cell cover 130.
In this way, it should be noted that the battery winding core 200 provides a voltage function to output the voltage to the external electric device, and the voltage of the battery winding core 200 is output to the external electric device through the tab 210; when the button type battery 10 is subjected to a welding operation, the position of the tab 210 of the battery roll core 200 is located, the welding operation is carried out on the tab 210, so that the contact part of the tab 210 at the central position of the battery roll core 200 and the battery cup 110 and/or the battery cover 130 is subjected to resistance welding to form a central welding layer 140, the contact part of the tab 210 at the edge position of the battery roll core 200 and the battery cup 110 and/or the battery cover 130 is subjected to resistance welding to form an edge welding layer 150, the central welding layer 140 and the edge welding layer 150 are formed, the connection stability of the tab 210 of the battery roll core 200 and the battery cup 110 and/or the battery cover 130 is stronger, compared with the traditional laser single-point welding, the laser single-point welding method can enable the tab 210 to be welded more stably, and can well prevent the tab 210 from being subjected to 'explosive welding' when the position of the tab 210 is not accurately positioned, that is, the tab 210 is not successfully welded to the cell cup 110 and/or the cell cover 130; in addition, due to the formation of the central welding layer 140 and the edge welding layer 150, when the position of the tab 210 is positioned, compared with the traditional laser single-point welding, the position of the tab 210 does not need to be accurately positioned, and the welding operation of the tab 210 is completed by covering a large area of the central welding layer 140 and the edge welding layer 150 on the battery cup 110 and/or the battery cover 130; in addition, in the conventional laser welding, the laser welding is an external-to-internal welding operation, that is, at a moment when the laser emits the laser, the laser slowly penetrates through the cell cup 110 and/or the cell cover 130 to the tab 210 to form a welding bead, the welding bead slowly transits from the cell cup 110 and/or the cell cover 130 to the tab 210 to join with the tab 210, that is, the laser welds the tab 210 from the outside to the inside, if the positioning of the tab is not accurate, the laser easily breaks down the cell cover 130 or the cell cup 110 directly at a moment when the laser emits the laser, the laser directly injects into the interior of the cell 200, there is a considerable safety hazard, and in the present application, a conductive path is formed between the positive welding head 21, the cell cup 110 and the negative welding head 22 or between the positive welding head 21, the cell cover 130 and the negative welding head 22, and at a moment when the double-needle welding head 20 is energized, the tab 210 located at the center position is welded with the cell cup 110 and/or the cell cover 130, compared with a welding bead formed by traditional laser welding, the central welding layer 140 and the edge welding layer 150 are welded together at the contact part of the lug and the battery cup 110 and/or the battery cover 130 at the moment of electrification, the welding layers gradually diffuse to the periphery along with the length of the electrification time, namely the area of the welding layers gradually increases along with the extension of the electrification time, and the welding stability between the welding layers and the lug 210 is enhanced by increasing the welding area of the welding layers and the lug 210; simultaneously, because the change of welding layer is by the center to diffusing all around, compare in traditional laser welding by outer and in, this application can be fine prevent when utmost point ear 210's position location is inaccurate, laser direct puncture battery cup 110 and/or battery cover 130 jet into inside the battery rolls up core 200, lead to battery to roll up core 200 and explode, arouse corresponding incident, and this application can finely stop the emergence of above-mentioned condition, utilize the welding layer of diffusion all around, accomplish the welding operation to utmost point ear 210, need not laser and pierce through battery cup 110 and/or battery cover 130 and can accomplish the welding operation to utmost point ear 210, this application is not by outer and interior welding process, but welding process from interior to exterior, factor of safety improves greatly.
Further, in one embodiment, the cell cup 110 has a center solder layer 140 and an edge solder layer 150 disposed thereon;
wherein: the center welding layer 140 is formed by resistance welding the tab 210 of the battery jelly roll 200 at the center position to the contact portion of the battery cup 110, and the edge welding layer 150 is formed by resistance welding the tab 210 of the battery jelly roll 200 at the edge position to the contact portion of the battery cup 110.
As such, it should be noted that, in an embodiment, only the center layer 140 and the edge layer 150 may be disposed on the cell cup 110, and the center layer 140 and the edge layer 150 are not disposed on the cell cover 130, and the functions and the forming manners of the center layer 140 and the edge layer 150 are not described in detail, please refer to the functions and the forming manners of the center layer 140 and the edge layer 150.
Further, referring to fig. 2 again, in one embodiment, the battery cover 130 is provided with a center solder layer 140 and an edge solder layer 150;
wherein: the center welding layer 140 is formed by resistance welding of the tab 210 of the battery core 200 at the center position to the contact portion of the battery cover 130, and the edge welding layer 150 is formed by resistance welding of the tab 210 of the battery core 200 at the edge position to the contact portion of the battery cover 130.
Thus, it should be noted that, in an embodiment, only the center layer 140 and the edge layer 150 may be disposed on the cell cover 130, and the center layer 140 and the edge layer 150 are not disposed on the cell cup 110, and the functions and the forming manners of the center layer 140 and the edge layer 150 are not described in detail, please refer to the functions and the forming manners of the center layer 140 and the edge layer 150.
Further, in one embodiment, the cell cup 110 and the cell cover 130 are provided with a center solder layer 140 and an edge solder layer 150;
wherein: the center welding layer 140 is formed by resistance welding the tab 210 of the battery core 200 at the center position to the contact portions of the battery cup 110 and the battery cover 130, and the edge welding layer 150 is formed by resistance welding the tab 210 of the battery core 200 at the edge position to the contact portions of the battery cup 110 and the battery cover 130.
As such, it should be noted that in one embodiment, the center solder layer 140 and the edge solder layer 150 may be disposed on both the cell cup 110 and the cell cover 130, and the functions and the forming manners of the center solder layer 140 and the edge solder layer 150 are not described in detail, please refer to the functions and the forming manners of the center solder layer 140 and the edge solder layer 150.
It should be noted that, when the central solder layer 140 and the edge solder layer 150 are disposed on the cell cup 110 and the cell cover 130, the user can directly draw the positive electrode and the negative electrode of the button cell 10 from the cell cup 110 and the cell cover 130, for example, when the cell cup 110 is connected to the positive electrode tab of the cell winding core 210, the cell cup 110 serves as the total positive electrode of the button cell 10, and when the cell cover 130 is connected to the negative electrode tab of the cell winding core 210, the cell cover 130 serves as the total negative electrode of the button cell 10; for another example, when the cell cup 110 is connected to the negative electrode tab of the cell core 210, the cell cup 110 serves as the total negative electrode of the button cell 10, and when the cell cover 130 is connected to the positive electrode tab of the cell core 210, the cell cover 130 serves as the total positive electrode of the button cell 10. In the actual manufacturing process, it is possible to flexibly set whether the cell cup 110 is the total positive electrode or the cell cover 130 is the total positive electrode in accordance with the actual manufacturing requirements.
It should be noted that, no matter the center solder layer 140 and the edge solder layer 150 are disposed on the cell cup 110 or the cell cover 130, or the center solder layer 140 and the edge solder layer 150 are disposed on the cell cup 110 and the cell cover 130, the center solder layer 140 and the edge solder layer 150 both have the same function, and both prevent the tab 210 of the cell core 200 from being "welded by explosion" and prevent the cell cup 110 and/or the cell cover 130 from being broken down.
Referring to fig. 2, 5, 6 and 7, since the double pin welding head 20 is required to perform resistance welding on the tab 210 of the battery jelly roll 200, correspondingly, when the tab 210 is subjected to resistance welding, the shape formed by welding the center welding layer 140 and the edge welding layer 150 is influenced by the double pin welding head 20 to a certain extent. For example, when the center welding layer 140 and the edge welding layer are both in a dot shape, the corresponding positive welding head 21 or negative welding head 22 in the two-pin welding head 20 corresponding to the welding center welding layer 140 is also in a dot shape; for another example, when the edge weld layer 150 is annular, the corresponding positive bonding tool 21 or negative bonding tool 22 of the two-pin bonding tool 20 corresponding to the welding center weld layer 140 is also annular; for another example, when the edge welding layer 150 is disc-shaped, correspondingly, the positive welding head 21 or the negative welding head 22 of the two-pin welding head 20 corresponding to the welding center welding layer 140 is also disc-shaped; for another example, referring to fig. 6 again, when the edge welding layer 150 includes a plurality of fan-shaped welding layers 151, each fan-shaped welding layer 151 is in a fan shape, each fan-shaped welding layer is radially distributed around the center of the battery cover, and correspondingly, the positive welding head 21 or the negative welding head 22 of the two-pin welding head 20 corresponding to the welding center welding layer 140 includes a plurality of fan-shaped welding pieces, which are radially distributed around the center of the positive welding head 21 or the negative welding head 22. It is emphasized that the shape of the double-needle welding head 20 can be flexibly set in connection with the actual production situation.
It should be noted that, in order to increase the assembly speed of the button cell 10, in an embodiment, a rolling groove is formed on the cell cup 110, the rolling groove allows the inner sidewall of the cell cup 110 to be recessed inwards to form a clamping step, the sealing rubber ring 120 is sleeved on the clamping step, the cell cover 130 is clamped in the sealing rubber ring 120, and the cell cover 130 is used for supporting the sealing rubber ring 120, so that the sealing rubber ring 120 is tightly contacted with the clamping step.
Therefore, it should be noted that the inside wall of the battery cup 110 is recessed inwards to form a clamping step by the opening of the rolling groove, when the battery cover 130 is assembled, the battery cover 130 can be assembled on the battery cup 110 only by providing an external force pressing downwards for the battery cover 130, and the battery cover 130 is stably fixed in the battery cup 110 by the mutual matching force among the clamping step, the battery cover 130 and the sealing rubber ring 120, so as to realize quick assembly, meanwhile, due to the arrangement of the clamping step, the clamping step can also prevent the battery cover 130 from pressing downwards too severely, so that the battery roll core 200 arranged in the inner cavity of the battery is damaged by extrusion; in addition, when the air pressure in the battery cavity is too high, the battery cover 130 can be separated from the connection with the battery cup 110 under the action of the air pressure, so that the pressure relief operation is completed, and the button-type battery 10 is prevented from being too high in air pressure.
It should be noted that, in order to prevent the battery cover 130 from pressing the battery core 200 and to prevent the battery core 200 from swelling. In an embodiment, the button cell 10 further includes a central pillar, a through hole is formed in the cell roll core 200, the central pillar is located in the through hole, and an end of the central pillar abuts against the tab 210 of the cell roll core 200.
Therefore, it should be noted that when the assembly of the battery cover 130 is pressed down too much, the central column can be limited to the battery cover 130, so as to prevent the battery cover 130 from being pressed down and damaged by the battery winding core 200; in addition, the center post also serves to prevent the battery roll core 200 from expanding with an unexpected factor, damaging the battery roll core 200.
The button cell and the manufacturing method thereof of the invention are provided with a packaging assembly and a cell winding core. In the practical application process, the battery cup and the battery cover both play a role in protection, and the sealing rubber ring plays a role in sealing and waterproofing; in addition, when the pole lug needs to be welded, the position of the pole lug is positioned, and resistance welding operation is carried out on the battery cup and/or the battery cover, so that the pole lug of the battery roll core at the central position and the battery cup and/or the contact part of the battery cover are subjected to resistance welding to form a central welding layer, the pole lug of the battery roll core at the edge position and the contact part of the battery cup and/or the battery cover are subjected to resistance welding to form an edge welding layer, the phenomenon of 'explosive welding' of the pole lug can be prevented due to the existence of the central welding layer and the edge welding layer, the welding stability of the pole lug is greatly improved, compared with the traditional laser welding mode, the welding safety coefficient is higher, and the risk that the battery cup or the battery cover is directly punctured by laser is avoided.
The above embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present 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. A button-type battery, characterized by comprising:
the sealing rubber ring is sleeved in the battery cup, the battery cover is clamped in the sealing rubber ring, the battery cover is used for supporting the sealing rubber ring so that the sealing rubber ring is tightly contacted with the inner side wall of the battery cup, the battery cup and the battery cover jointly enclose a battery inner cavity, and a welding layer is arranged on the battery cup and/or the battery cover; and
the battery winding core is arranged in the battery inner cavity and provided with a lug;
and adopting a double-needle welding head to weld, wherein the double-needle welding head comprises a positive welding head and a negative welding head, and at the moment of electrifying the double-needle welding head, a conductive path is formed among the positive welding head, the battery cup and the negative welding head or among the positive welding head, the battery cover and the negative welding head, so that the resistance welding operation is carried out on the tab.
2. The button cell of claim 1, wherein the solder layer is formed by a double pin weld head that is used to resistance weld the cell cup and/or cell cover after the assembly and the cell core are assembled, by positioning the tab of the cell core.
3. The button cell according to claim 1, wherein the solder layer is formed by resistance welding of the contact portion of the tab of the cell jelly roll with the cell cup and/or the cell cover.
4. Button cell according to claim 1 or 2, characterized in that said solder layers comprise a central solder layer and an edge solder layer; the central welding layer is formed by resistance welding of a contact part of a lug of the battery winding core at the central position and the battery cup and/or the battery cover, and the edge welding layer is formed by resistance welding of a contact part of the lug of the battery winding core at the edge position and the battery cup and/or the battery cover.
5. The button type battery according to claim 1 or 2, wherein the battery cup is provided with a rolling groove, the rolling groove enables the inner side wall of the battery cup to be inwards recessed to form a clamping step, the sealing rubber ring is sleeved on the clamping step, the battery cover is clamped in the sealing rubber ring, and the battery cover is used for supporting the sealing rubber ring;
the battery winding core is internally provided with a through hole, the central column is positioned in the through hole, and the end part of the central column is propped against the lug of the battery winding core.
6. The button cell according to claim 3, wherein the center solder layer and the edge solder layer are each in the shape of a dot.
7. Button cell according to claim 1 or 2, characterised in that the variation of the welding layer is a diffusion from the centre to the periphery.
8. A method for manufacturing a button cell, comprising the steps of:
step S01, providing a packaging assembly and a battery winding core for manufacturing the button-type battery, wherein the packaging assembly comprises a battery cup, a sealing rubber ring and a battery cover;
step S02, placing a sealing rubber ring in the battery cup, placing the battery roll core in the battery cup, clamping the battery cover in the sealing rubber ring, and supporting the sealing rubber ring by the battery cover so that the sealing rubber ring is tightly contacted with the inner side wall of the battery cup, wherein the battery cup and the battery cover together enclose a battery inner cavity, and the battery roll core is positioned in the battery inner cavity;
s03, positioning the tab position of the battery winding core, and performing resistance welding operation on the battery cup and/or the battery cover;
the contact part of the pole ear of the battery winding core and the battery cup and/or the battery cover is subjected to resistance welding to form a welding layer;
and adopting a double-needle welding head to weld, wherein the double-needle welding head comprises a positive welding head and a negative welding head, and at the moment of electrifying the double-needle welding head, a conductive path is formed among the positive welding head, the battery cup and the negative welding head or among the positive welding head, the battery cover and the negative welding head, so that the resistance welding operation is carried out on the tab.
9. The method of manufacturing a button cell according to claim 8, wherein said solder layer comprises a center solder layer and an edge solder layer; the central welding layer is formed by resistance welding of a contact part of a lug of the battery winding core at the central position and the battery cup and/or the battery cover, and the edge welding layer is formed by resistance welding of a contact part of the lug of the battery winding core at the edge position and the battery cup and/or the battery cover;
the battery cup is provided with a rolling groove, the rolling groove enables the inner side wall of the battery cup to be inwards sunken to form a clamping step, the sealing rubber ring is sleeved on the clamping step, the battery cover is clamped in the sealing rubber ring, and the battery cover is used for supporting the sealing rubber ring;
and carrying out resistance welding operation on the battery cup and/or the battery cover by using a double-pin welding head.
10. A method for manufacturing a button cell, comprising the steps of:
step S01, providing a packaging assembly and a battery winding core for manufacturing the button-type battery, wherein the packaging assembly comprises a battery cup, a sealing rubber ring and a battery cover;
step S02, placing a sealing rubber ring in the battery cup, placing the battery roll core in the battery cup, clamping the battery cover in the sealing rubber ring, and supporting the sealing rubber ring by the battery cover so that the sealing rubber ring is tightly contacted with the inner side wall of the battery cup, wherein the battery cup and the battery cover together enclose a battery inner cavity, and the battery roll core is positioned in the battery inner cavity;
step S03, after the position of the pole ear of the battery roll core is confirmed, the laser is aligned to the center position of the battery cover or the battery case, and the pole ear and the battery cover or the battery case are welded together at the moment when the laser emits laser;
the laser welding is a welding operation from outside to inside, and single-point laser welding is adopted.
CN202110532672.7A 2019-05-15 2019-05-15 Button-type battery and method for manufacturing the same Pending CN113363635A (en)

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CN110336065A (en) 2019-10-15
CN113363636A (en) 2021-09-07
CN113363636B (en) 2023-06-30
CN110336065B (en) 2021-05-18
CN113363633A (en) 2021-09-07
CN113363634B (en) 2023-08-04
CN113363633B (en) 2023-06-06

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