CN111180616A - Button battery and preparation process thereof - Google Patents
Button battery and preparation process thereof Download PDFInfo
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- CN111180616A CN111180616A CN202010058736.XA CN202010058736A CN111180616A CN 111180616 A CN111180616 A CN 111180616A CN 202010058736 A CN202010058736 A CN 202010058736A CN 111180616 A CN111180616 A CN 111180616A
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- steel shell
- sealing ring
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- sealant
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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
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
- H01M50/183—Sealing members
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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
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
- H01M50/102—Primary casings, jackets or wrappings of a single cell or a single battery characterised by their shape or physical structure
- H01M50/109—Primary casings, jackets or wrappings of a single cell or a single battery characterised by their shape or physical structure of button or coin shape
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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
- H01M2220/00—Batteries for particular applications
- H01M2220/30—Batteries in portable systems, e.g. mobile phone, laptop
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- 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
Abstract
The invention relates to the field of batteries and discloses a button battery and a preparation process thereof. The preparation process comprises the following steps: providing an electric core assembly, wherein the electric core assembly comprises an electric core main body, a positive electrode lug and a negative electrode lug; providing a first steel shell and a second steel shell, placing the electric core assembly in the first steel shell, and injecting electrolyte; providing a sealing ring, arranging sealant on the surface of the sealing ring, superposing the first steel shell, the sealing ring and the second steel shell to ensure that the sealing ring is arranged between the first steel shell and the second steel shell, and heating and sealing the mutually superposed parts of the first steel shell, the sealing ring and the second steel shell; and welding the positive electrode lug and the first steel shell, and welding the negative electrode lug and the second steel shell to obtain the button battery. According to the button battery, the sealant is arranged on the surface of the sealing ring, so that the sealing performance of the button battery can be improved, the service life of the button battery is longer, the safety performance is better, the process flow of the preparation process is simple, and the quality of a finished product is improved.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a button battery and a preparation process thereof.
Background
The button cell is also called button cell, which refers to a cell with the external dimension like a small button, generally speaking, the diameter is larger, the thickness is thinner, the button cell is in a flat structure, the button cell has the advantages of small volume, wide application in various micro electronic products, high practicability, stable discharge voltage, wide working temperature range, long storage life and the like, the button cell is widely applied to various products such as computer mainboard, calculator, electronic watch, remote controller and electronic toy, and is generally used as a backup power source of various electronic products such as computer mainboard, electronic watch, electronic dictionary, electronic scale, remote controller, electric toy, cardiac pacemaker, electronic hearing aid, counter and camera, the button cell generally comprises a positive electrode, a negative electrode, an electric core, electrolyte and the like, the external surface of the button cell is made of stainless steel materials including a positive electrode stainless steel shell and a negative electrode stainless steel shell, the battery is characterized in that a sealing ring is arranged between the positive stainless steel shell and the negative stainless steel shell for insulation, the sealing ring can prevent electrolyte from leaking and has a sealing effect, a battery cell is accommodated in the battery, the battery cell generally comprises a positive plate, a negative plate and a diaphragm, the battery cell packaged in the positive stainless steel shell and the negative stainless steel shell is soaked or soaked by the electrolyte, the types of button batteries are more, and most of the button batteries are named by the used materials, such as silver oxide batteries, lithium batteries, alkaline manganese batteries and the like.
However, the conventional button cell generally achieves a sealing effect by disposing a sealing ring between a positive stainless steel case and a negative stainless steel case, but the conventional button cell has a problem of poor sealing performance, the sealing operation of the button cell generally includes first installing the sealing ring on the positive stainless steel case or the negative stainless steel case, and then matching the positive stainless steel case and the negative stainless steel case to seal the button cell, and gaps are easily formed between the sealing ring and the positive stainless steel case and between the sealing ring and the negative stainless steel case, the sealing operation precision of the conventional button cell is high, which is not favorable for industrial production, and the sealing ring is easily worn during the matching process of the positive stainless steel case and the negative stainless steel case, thereby affecting the sealing performance of the button cell and affecting the service life of the button cell, meanwhile, the poor sealing performance of the button cell can also cause electrolyte to leak, so that danger is caused and the health of people is harmed.
Disclosure of Invention
The button cell and the preparation process thereof have the advantages that the process flow of the preparation process is simple, the sealing performance and the service life of the button cell can be greatly improved, and the quality of a finished product is improved.
The purpose of the invention is realized by the following technical scheme:
a preparation process of a button battery comprises the following steps:
providing an electric core assembly, wherein the electric core assembly comprises an electric core main body, a positive electrode lug and a negative electrode lug;
providing a first steel shell and a second steel shell, placing the electric core assembly in the first steel shell, and injecting electrolyte;
providing a sealing ring, arranging sealant on the surface of the sealing ring, superposing the first steel shell, the sealing ring and the second steel shell to ensure that the sealing ring is arranged between the first steel shell and the second steel shell, and heating and sealing the superposed parts of the first steel shell, the sealing ring and the second steel shell;
and welding the positive electrode lug and the first steel shell, and welding the negative electrode lug and the second steel shell to obtain the button battery.
In one embodiment, the battery cell main body includes a positive plate, a negative plate, and a separator, and the positive plate, the separator, and the negative plate are sequentially stacked, and then the positive plate, the separator, and the negative plate are wound to form the battery cell main body.
In one embodiment, in the operation of arranging the sealant on the surface of the sealing ring and laminating the first steel shell, the sealing ring and the second steel shell, the sealant is firstly rolled on the inner side wall of the sealing ring to obtain a first sealant layer, the sealing ring is sleeved on the second steel shell to make the first sealant layer contact with the second steel shell, the sealant is then rolled on the outer side wall of the sealing ring to obtain a second sealant layer, and the second steel shell is covered in the first steel shell to make the second sealant layer contact with the first steel shell, so that lamination is completed.
In one embodiment, a sealant is arranged on the surface of the sealing ring, the first steel shell is coated with the sealant on the inner side wall of the sealing ring to obtain a first sealant layer, the sealant is coated on the outer side wall of the sealing ring to obtain a second sealant layer, the sealing ring is placed in the first steel shell to make the second sealant layer contact with the first steel shell, and then the second steel shell is covered and arranged in the first steel shell to make the first sealant layer contact with the second steel shell to complete the superposition.
In one embodiment, the heating temperature is controlled to 65-85 ℃ and the heating time is controlled to 15-28 s in the operation of heating and sealing the overlapped part of the first steel shell, the sealing ring and the second steel shell.
In one embodiment, in the operation of welding the positive electrode tab and the first steel shell, resistance welding is used for welding the positive electrode tab and the first steel shell.
In one embodiment, in the operation of welding the negative electrode tab and the second steel shell, resistance welding is used to weld the negative electrode tab and the second steel shell.
A button cell comprises a sealing assembly and a cell assembly, wherein the cell assembly is arranged in the sealing assembly;
the sealing assembly comprises a first steel shell, a second steel shell and a sealing ring, the sealing ring is arranged between the first steel shell and the second steel shell, a first sealing adhesive layer is arranged on the inner side wall of the sealing ring, a second sealing adhesive layer is arranged on the outer side wall of the sealing ring, the first sealing adhesive layer is connected with the second steel shell, the second sealing adhesive layer is connected with the first steel shell, and the first steel shell and the second steel shell are sealed to form a containing cavity;
the electric core assembly is arranged in the accommodating cavity.
In one embodiment, the cell assembly includes a cell main body, a positive tab and a negative tab, the cell main body is disposed in the accommodating cavity, the positive tab is disposed at one end of the first steel shell, the positive tab is welded to the first steel shell, the negative tab is disposed at one end of the second steel shell, and the negative tab is welded to the second steel shell.
In one embodiment, the cell main body is a winding-type cell main body, and the cell main body includes a positive plate, a negative plate, and a diaphragm, and the diaphragm is disposed between the positive plate and the negative plate.
Compared with the prior art, the invention has at least the following advantages:
the surface of the sealing ring is provided with the sealant, so that the sealing performance of the button battery can be greatly improved, on one hand, the sealant on the surface of the sealing ring can fill up gaps possibly existing when the sealing ring is overlapped with the first steel shell and the second steel shell, the gaps between the first steel shell and the sealing ring and between the second steel shell and the sealing ring are avoided, and the sealing performance of the button battery is improved, on the other hand, the sealing ring can also fill up the damages, holes and cracks of the sealing ring due to the abrasion possibly existing when the sealing ring is assembled with the first steel shell and the second steel shell, for example, the sealing ring is easy to be damaged, holes and cracks, and the sealant can also fill up the damages, holes and cracks of the sealing ring, so that the sealing performance of the button battery is further improved, and the sealant has good sealing performance, so that the sealing performance of the button battery is well improved, and the service life of, the safety performance is better. The preparation process of the button cell is simple in process flow, can greatly improve the sealing performance and the service life of the button cell, improves the quality of the finished product of the button cell, and is suitable for industrial production.
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 process according to an embodiment of the present invention;
fig. 2 is a schematic view of an assembly structure of a button cell according to an embodiment of the invention;
fig. 3 is an exploded view of a button cell according to an embodiment of the present invention;
fig. 4 is a schematic view of the internal structure of a button cell according to an embodiment of the invention;
fig. 5 is an enlarged schematic view at a of fig. 4.
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.
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.
In one embodiment, referring to fig. 1, a process for manufacturing a button cell includes the following steps:
s110, providing a cell assembly, wherein the cell assembly comprises a cell main body, a positive electrode lug and a negative electrode lug.
It should be noted that the cell assembly is an assembly for storing electric energy of the button cell, when the button cell is used, the button cell is connected to an external electric device through the button cell, the cell assembly can output the electric energy to provide the required electric energy for the external electric device, so that the external electric device can normally operate, wherein the electric energy is stored in the cell main body, the cell main body can be a winding cell main body or a lamination cell main body, a suitable cell main body preparation process can be adopted according to specific production requirements, a positive electrode tab and a negative electrode tab are used as electrodes of the button cell, and are used for conveying the electric energy in the cell main body to the external electric device, specifically, the positive electrode tab and the negative electrode tab are respectively arranged at two ends of the cell main body, so as to facilitate the subsequent installation and welding of the positive electrode tab and the negative electrode tab, and simultaneously avoid the positive electrode tab from contacting with the negative electrode tab, the occurrence of short circuit is avoided, and the safety performance of the button cell during use is improved.
In order to improve the production efficiency of the cell main body and the production efficiency of the button battery, in one embodiment, the cell main body comprises a positive plate, a negative plate and a diaphragm, and the positive plate, the diaphragm and the negative plate are sequentially stacked and then wound to form the cell main body. It should be noted that the electrical core main body of the button battery mainly has two preparation processes of winding and lamination, wherein the lamination process is a process mode of cutting the positive plate, the negative plate and the diaphragm into a shape and a size required by specific production, then laminating the positive plate, the diaphragm and the negative plate into the electrical core main body, the winding process is a process mode of arranging the diaphragm between the positive plate and the negative plate, and then rolling the positive plate, the negative plate and the diaphragm into the electrical core main body, because the lamination process needs to cut the positive plate, the negative plate and the diaphragm into the shape and the size required by the specific production, the lamination process has higher complexity, needs to invest more production time, is not beneficial to improving the production efficiency of the button battery, the winding process is simpler and more convenient to operate, only needs to cut the positive plate, the negative plate and the diaphragm into a regular strip-shaped structure with a certain size, is simpler and more convenient, and, the production method is easy to realize industrial automation, namely, the production efficiency of the winding process is high, the winding method is more suitable for industrial production, and under comprehensive consideration, the positive plate, the diaphragm and the negative plate are wound to form the cell main body, namely, the cell main body is prepared through the winding process, so that the production efficiency of the cell main body can be improved, and the production efficiency of the button battery is improved.
And S120, providing a first steel shell and a second steel shell, placing the electric core assembly in the first steel shell, and injecting electrolyte.
It should be noted that, first box hat and second box hat are the structure that has the recess, through placing the electric core subassembly in the recess of first box hat, and pour into electrolyte, accomplish the installation of electric core subassembly, it is concrete, the electric core subassembly includes electric core main part, anodal utmost point ear and negative pole utmost point ear set up respectively in the both ends of electric core main part, place the one end that electric core main part was provided with anodal utmost point ear on first box hat, thereby make anodal utmost point ear and first box hat contact, be convenient for follow-up anodal utmost point ear and first box hat weld, thereby make first box hat regard as button cell anodal output, the installation of electric core subassembly is swift convenient, electrolyte injection is convenient, and the production process is simple, and the production efficiency is high.
S130, providing a sealing ring, arranging sealant on the surface of the sealing ring, superposing the first steel shell, the sealing ring and the second steel shell to enable the sealing ring to be arranged between the first steel shell and the second steel shell, and heating and sealing the superposed part of the first steel shell, the sealing ring and the second steel shell.
It should be noted that, by arranging the sealing ring, arranging the sealing ring between the first steel shell and the second steel shell by superposition, the electric core assembly can be sealed in the first steel shell and the second steel shell, and simultaneously, avoiding the leakage of the electrolyte, by arranging the sealant on the surface of the sealing ring, the sealant can fill the gaps between the first steel shell, the second steel shell and the sealing ring, and fill the possible damages, holes and cracks of the sealing ring, thereby greatly improving the sealing effect, improving the sealing performance of the finished product of the button cell, and simultaneously, by arranging the sealant on the surface of the sealing ring, the connection of the sealing ring with the first steel shell and the second steel shell can be realized by the sealant, because the sealant has excellent bonding effect, the connection of the sealing ring with the first steel shell and the second steel shell is firm, thereby the structure of the finished product of the button cell is stable, the quality is high.
In one embodiment, in the operation of arranging the sealant on the surface of the sealing ring and laminating the first steel shell, the sealing ring and the second steel shell, the sealant is firstly rolled on the inner side wall of the sealing ring to obtain a first sealant layer, the sealing ring is sleeved on the second steel shell to make the first sealant layer contact with the second steel shell, the sealant is then rolled on the outer side wall of the sealing ring to obtain a second sealant layer, the second steel shell is covered in the first steel shell to make the second sealant layer contact with the first steel shell, and lamination is completed. It should be noted that the sealant is rolled on the inner side wall of the sealing ring to obtain a first sealing adhesive layer, the sealing ring is sleeved on the second steel shell, the sealing ring is connected with the second steel shell through the first sealing adhesive layer and is more stably connected, the sealant is rolled on the outer side wall of the sealing ring to obtain a second sealing adhesive layer, the second steel shell cover which is sleeved with the sealing ring is arranged in the first steel shell, the sealing ring is connected with the first steel shell through the second sealing adhesive layer and is more stably connected, the first steel shell covers the sealing ring and the second steel shell to complete superposition, the sealant can be uniformly coated on the surface of the sealing ring through a rolling brush process, the gluing effect of the sealing ring is good, and the quality of the prepared button cell finished product is high.
In another embodiment, in the operation of disposing the sealant on the surface of the sealing ring and laminating the first steel shell, the sealing ring and the second steel shell, the sealant is firstly rolled on the inner sidewall of the sealing ring to obtain a first sealant layer, the sealant is rolled on the outer sidewall of the sealing ring to obtain a second sealant layer, the sealing ring is placed in the first steel shell to contact the second sealant layer with the first steel shell, and then the second steel shell is covered in the first steel shell to contact the first sealant layer with the second steel shell, thereby completing lamination. It should be noted that, by rolling and brushing the sealant on the inner side wall and the outer side wall of the sealing ring, a first sealing adhesive layer and a second sealing adhesive layer are respectively obtained, then the sealing ring is placed on the first steel shell, the outer side wall of the sealing ring is connected with the first steel shell through the second sealing adhesive layer, the second steel shell cover is arranged in the first steel shell, the inner side wall of the sealing ring is connected with the second steel shell through the first sealing adhesive layer, the connection is more stable, the first steel shell covers the sealing ring and the second steel shell to complete the superposition, the sealant can be uniformly coated on the surface of the sealing ring through a rolling and brushing process, the gluing effect of the sealing ring is good, and the quality of the prepared button cell finished product is high.
In order to better glue the sealing ring and further improve the sealing performance of the finished button cell product, in one embodiment, a first convex pattern is arranged on the inner side wall of the sealing ring, and a second convex pattern is arranged on the outer side wall of the sealing ring. It should be noted that, be provided with first burr through the inside wall at the sealing washer, can be so that the inside wall of sealing washer and the sealed area of contact of gluing increase, can increase the sealed volume of gluing of inside wall adhesion, and likewise, be provided with the second burr through the lateral wall at the sealing washer, can be so that the lateral wall of sealing washer and the sealed area of contact of gluing increase, can increase the sealed volume of gluing of lateral wall adhesion, guarantee that there is sufficient sealed glue to fill the gap, and the damage that probably exists to the sealing washer, hole and crack are filled, and simultaneously, can improve the fastness of bonding, further improve button cell finished product structure's stability and leakproofness.
In order to avoid the shortage or excessive use of the sealant, in one embodiment, the thickness of the first sealant layer is 0.11mm to 0.25mm, and the thickness of the second sealant layer is 0.11mm to 0.25 mm. It should be noted that, the thickness of the first sealant layer and the thickness of the second sealant layer respectively determine the amount of the sealant on the inner side wall and the outer side wall of the sealing ring, when the thickness of the first sealant layer is smaller than 0.11mm and the thickness of the second sealant layer is smaller than 0.11mm, the amount of the sealant is too small to ensure that sufficient sealant is filled in the gaps between the first steel shell and the sealing ring, and possible damages, holes and cracks of the sealing ring are filled, which affects the sealing performance of the finished product, when the thickness of the first sealant layer is larger than 0.25mm and the thickness of the second sealant layer is larger than 0.25mm, the amount of the sealant is too large, which on one hand causes sealant resource waste and is not good for improving the production benefit, on the other hand, excessive sealant may cause sealant overflow and is easy to cause bad appearance of the finished product, under comprehensive consideration, the thickness of the first sealing adhesive layer is controlled to be 0.11-0.25 mm, and the thickness of the second sealing adhesive layer is controlled to be 0.11-0.25 mm.
In one embodiment, the thickness of the first sealant layer is 0.21mm, and the thickness of the second sealant layer is 0.21 mm. It should be noted that the thickness of the first sealant layer is controlled to be 0.21mm, and the thickness of the second sealant layer is controlled to be 0.21mm, so that the thicknesses of the first sealant layer and the second sealant layer are moderate, that is, the amount of the sealant is moderate, the sealing performance of the finished button battery product can be ensured, meanwhile, the sealant resource waste is avoided, and the production benefit is improved.
In one embodiment, the heating temperature is controlled to 65 to 85 ℃ and the heating time is controlled to 15 to 28 seconds in the operation of performing the heat sealing treatment on the portion where the first steel shell, the seal ring and the second steel shell are overlapped with each other.
It should be noted that, by heating the mutual overlapped position of the first steel shell, the sealing ring and the second steel shell, on one hand, the heating is beneficial to promoting the sealant to fill the gaps among the first steel shell, the second steel shell and the sealing ring and to fill the damage, holes and cracks of the sealing ring, so as to achieve better sealing effect, on the other hand, the curing of the sealant can be accelerated, so as to accelerate the sealing operation of the button cell, improve the production efficiency, the main factors influencing the sealing process and the sealing efficiency are the temperature and the heating time, and the proper temperature and the heating time need to be controlled, when the heating temperature is lower than 65 ℃, the promoting effect of filling the gaps, the damage, the holes and the cracks with the sealant is not obvious, and the curing of the sealant can not be promoted well, the sealing effect is general, the sealing treatment efficiency is low, when the heating temperature is higher than 85 ℃, the heating temperature is too high, the overheating phenomenon is easy to occur, the performance of the sealant is easy to be influenced, so that the sealing effect is influenced, the sealing performance of the finished product of the button cell is influenced, meanwhile, the heating temperature is too high, the interior of the first steel shell and the second steel shell can reach higher temperature, the higher temperature can also influence the performance of the cell assemblies and the electrolyte in the first steel shell and the second steel shell, further, the electrical performance of the prepared button cell is influenced, the quality and the service life of the finished product of the button cell are reduced, in addition, when the heating time is less than 15s, the heating sealing time is too short, the sealant cannot be completely cured, the sealing effect is easy to be influenced, when the heating time is more than 28s, the heating sealing time is too long, the sealant is basically cured, the continuous heating can possibly influence the performance of the sealant, and simultaneously, the heating sealing efficiency is not beneficial to be improved, the production efficiency is influenced, and the heating temperature is controlled to be 65-85 ℃ and the heating time is controlled to be 15-28 s under comprehensive consideration.
In order to further improve the heating sealing efficiency, improve the production efficiency and ensure the quality of the finished product of the button cell, in one embodiment, the heating temperature is controlled to be 79.6 ℃ and the heating time is controlled to be 21s in the operation of carrying out the heating sealing treatment on the overlapped part of the first steel shell, the sealing ring and the second steel shell. It can be understood that the heating temperature is controlled to be 79.6 ℃, the temperature is moderate, the sealant can be well filled in gaps, damages, holes and cracks, the sealing effect is good, the quality of finished products of the button batteries is high, meanwhile, the curing of the sealant can be accelerated, the heating sealing efficiency is improved, the production efficiency is improved, the heating time is controlled to be 21s, the overlong or overlong heating time is avoided, the heating time for full filling of the heating sealing is ensured, and the influence of the overlong heating time on the production efficiency can be avoided.
S140, welding the positive electrode lug and the first steel shell, and welding the negative electrode lug and the second steel shell to obtain the button battery.
It should be noted that, because the end of the cell main body provided with the positive electrode tab is placed on the first steel shell, the positive electrode tab is made to contact with the first steel shell, after the first steel shell, the sealing ring and the second steel shell are overlapped, the second steel shell cover is arranged on the first steel shell, the cell component is sealed, and meanwhile, the negative electrode tab is made to contact with the second steel shell, after the sealing treatment is completed, the positive electrode tab is welded with the overlapping area of the first steel shell, and the negative electrode tab is welded with the overlapping area of the second steel shell, so that the first steel shell is used as the positive output end of the button cell, and the second steel shell is used as the negative output end of the button cell and is used for being connected with an external power device to supply power for the external power device.
In one embodiment, the positive electrode tab and the first steel shell are welded by resistance welding in the operation of welding the positive electrode tab and the first steel shell. And in the operation of welding the negative pole lug and the second steel shell, resistance welding is adopted to weld the negative pole lug and the second steel shell. It should be noted that after the sealing process is completed, the overlapped area of the positive electrode tab and the first steel shell is resistance welded by the resistance welding needle, the positive electrode tab and the first steel shell are welded together, similarly, the overlapped area of the negative electrode tab and the second steel shell is resistance welded by the resistance welding needle, the negative electrode tab and the second steel shell are welded together, and resistance welding is adopted for welding, and the resistance welding has the characteristics of short heating time and concentrated heat, so the heat affected zone is small, the deformation and the stress are small, and the correction and the heat treatment process are not needed to be arranged after welding, therefore, the influence on the electric core main body and the electrolyte sealed in the first steel shell and the second steel shell can be avoided, the performance of the electric core main body and the electrolyte can be ensured, thereby the quality of the prepared button cell is ensured, and meanwhile, the resistance welding operation is simple, and the mechanization and automation are easy to realize, is suitable for industrial production.
In one embodiment, referring to fig. 2, 4 and 5, a button cell 10 includes a sealing assembly 100 and a battery cell assembly 200, wherein the battery cell assembly 200 is disposed in the sealing assembly 100; the sealing assembly 100 comprises a first steel shell 110, a second steel shell 120 and a sealing ring 130, wherein the sealing ring 130 is arranged between the first steel shell 110 and the second steel shell 120, a first sealing adhesive layer 131 is arranged on the inner side wall of the sealing ring 130, a second sealing adhesive layer 132 is arranged on the outer side wall of the sealing ring 130, the first sealing adhesive layer 131 is connected with the second steel shell 120, the second sealing adhesive layer 132 is connected with the first steel shell 110, and the first steel shell 110 and the second steel shell 120 are sealed to form a containing cavity; the electric core assembly 200 is disposed in the receiving cavity. It should be noted that, by respectively disposing the first sealant layer 131 and the second sealant layer 132 on the inner and outer sidewalls of the sealing ring 130, the sealing performance of the button cell 10 can be greatly improved, on one hand, the first sealant layer 131 and the second sealant layer 132 can fill up gaps possibly existing when the sealing ring 130 is stacked with the first steel shell 110 and the second steel shell 120, so as to avoid gaps existing between the first steel shell 110, the second steel shell 120 and the sealing ring 130, and improve the sealing performance of the button cell 10, on the other hand, because the sealing ring 130 is assembled with the first steel shell 110 and the second steel shell 120, and the abrasion possibly existing when the sealing ring 130 is assembled, for example, the sealing ring 130 is easily damaged, holes, cracks, and the like, the first sealant layer 131 and the second sealant layer 132 can also fill up the damage, holes, and cracks of the sealing ring 130, so as to improve the sealing performance of the button cell 130, further improve the sealing performance of the button cell 10, moreover, the sealant has good sealing performance, so that the sealing performance of the button cell 10 is improved well, the service life of the button cell 10 is longer, and the safety performance is better.
In an embodiment, referring to fig. 3, the battery assembly 200 includes a battery cell main body 210, a positive tab 220 and a negative tab 230, the battery cell main body 210 is disposed in the accommodating cavity, the positive tab 220 is disposed at one end of the battery cell main body 210 close to the first steel shell 110, the positive tab 220 is welded to the first steel shell 110, the negative tab 230 is disposed at one end of the battery cell main body 210 close to the second steel shell 120, and the negative tab 230 is welded to the second steel shell 120. The cell main body 210 is used for storing electric energy, the positive electrode tab 220 and the negative electrode tab 230 are used as electrodes of the button cell 10 and are used for conveying the electric energy in the cell main body 210 to an external electric device, the positive electrode tab 220 is arranged at one end of the cell main body 210 close to the first steel shell 110, so that the positive electrode tab 220 is in contact with the first steel shell 110, and the subsequent welding of the positive electrode tab 220 and the first steel shell 110 is facilitated, so that the first steel shell 110 is used as an output end of the positive electrode of the button cell 10, the negative electrode tab 230 is arranged at one end of the cell main body 210 close to the second steel shell 120, so that the negative electrode tab 230 is in contact with the second steel shell 120, and the subsequent welding of the negative electrode tab 230 and the second steel shell 120 is facilitated, so that the second steel shell 120 is used as an output end of the negative electrode of the button cell 10, specifically, the positive electrode tab 220 and the negative electrode tab 230 are respectively arranged at two ends of the cell main body, meanwhile, the contact between the positive electrode tab 220 and the negative electrode tab 230 is avoided, the short circuit is avoided, and the safety performance of the button battery 10 in use is improved.
In order to improve the production efficiency of the cell main body 210 and the production efficiency of the button cell 10, in one embodiment, referring to fig. 4 and 5, the cell main body 210 is a winding-type cell main body, the cell main body 210 includes a positive plate 211, a negative plate 212 and a diaphragm 213, and the diaphragm 213 is disposed between the positive plate 211 and the negative plate 212. It should be noted that, the cell main body 210 is a winding-type cell main body, that is, the separator 213 is disposed between the positive electrode sheet 211 and the negative electrode sheet 212, and then the positive electrode sheet 211, the negative electrode sheet 212, and the separator 213 are wound into the cell main body 210, so as to obtain the winding-type cell main body, which has high production efficiency and is more suitable for industrial production.
Compared with the prior art, the invention has at least the following advantages:
the surface of the sealing ring is provided with the sealant, so that the sealing performance of the button battery can be greatly improved, on one hand, the sealant on the surface of the sealing ring can fill up gaps possibly existing when the sealing ring is overlapped with the first steel shell and the second steel shell, the gaps between the first steel shell and the sealing ring and between the second steel shell and the sealing ring are avoided, and the sealing performance of the button battery is improved, on the other hand, the sealing ring can also fill up the damages, holes and cracks of the sealing ring due to the abrasion possibly existing when the sealing ring is assembled with the first steel shell and the second steel shell, for example, the sealing ring is easy to be damaged, holes and cracks, and the sealant can also fill up the damages, holes and cracks of the sealing ring, so that the sealing performance of the button battery is further improved, and the sealant has good sealing performance, so that the sealing performance of the button battery is well improved, and the service life of, the safety performance is better. The preparation process of the button cell is simple in process flow, can greatly improve the sealing performance and the service life of the button cell, improves the quality of the finished product of the button cell, and is suitable for industrial production.
The following is a detailed example section of the production process of the button cell 10
Example 1
Providing an electric core assembly, wherein the electric core assembly comprises an electric core main body, a positive electrode lug and a negative electrode lug, the electric core main body comprises a positive plate, a negative plate and a diaphragm, the positive plate, the diaphragm and the negative plate are sequentially laminated, and then the positive plate, the diaphragm and the negative plate are wound to obtain a winding type electric core main body;
providing a first steel shell and a second steel shell, placing the electric core assembly in the first steel shell, and injecting electrolyte;
providing a sealing ring, rolling and brushing a sealant on the inner side wall of the sealing ring to obtain a first sealing adhesive layer, sleeving the sealing ring on a second steel shell to enable the first sealing adhesive layer to be in contact with the second steel shell, rolling and brushing the sealant on the outer side wall of the sealing ring to obtain a second sealing adhesive layer, covering the second steel shell in the first steel shell to enable the second sealing adhesive layer to be in contact with the first steel shell to complete superposition, controlling the heating temperature to be 65 ℃, and performing heating sealing treatment on the mutual superposition part of the first steel shell, the sealing ring and the second steel shell, wherein the heating time is 15 s;
the positive electrode tab and the first steel shell were welded by a resistance welding needle, and the negative electrode tab and the second steel shell were welded by a resistance welding needle, to obtain the button cell of example 1.
Example 2
Providing an electric core assembly, wherein the electric core assembly comprises an electric core main body, a positive electrode lug and a negative electrode lug, the electric core main body comprises a positive plate, a negative plate and a diaphragm, the positive plate, the diaphragm and the negative plate are sequentially laminated, and then the positive plate, the diaphragm and the negative plate are wound to obtain a winding type electric core main body;
providing a first steel shell and a second steel shell, placing the electric core assembly in the first steel shell, and injecting electrolyte;
providing a sealing ring, rolling and brushing a sealant on the inner side wall of the sealing ring to obtain a first sealing adhesive layer, sleeving the sealing ring on a second steel shell to enable the first sealing adhesive layer to be in contact with the second steel shell, rolling and brushing the sealant on the outer side wall of the sealing ring to obtain a second sealing adhesive layer, covering the second steel shell in the first steel shell to enable the second sealing adhesive layer to be in contact with the first steel shell to complete superposition, controlling the heating temperature to be 79.6 ℃, and performing heating sealing treatment on the mutually superposed parts of the first steel shell, the sealing ring and the second steel shell, wherein the heating time is 21 s;
the positive electrode tab and the first steel shell were welded by a resistance welding needle, and the negative electrode tab and the second steel shell were welded by a resistance welding needle, to obtain the button cell of example 2.
Example 3
Providing an electric core assembly, wherein the electric core assembly comprises an electric core main body, a positive electrode lug and a negative electrode lug, the electric core main body comprises a positive plate, a negative plate and a diaphragm, the positive plate, the diaphragm and the negative plate are sequentially laminated, and then the positive plate, the diaphragm and the negative plate are wound to obtain a winding type electric core main body;
providing a first steel shell and a second steel shell, placing the electric core assembly in the first steel shell, and injecting electrolyte;
providing a sealing ring, rolling and brushing a sealant on the inner side wall of the sealing ring to obtain a first sealing adhesive layer, sleeving the sealing ring on a second steel shell to enable the first sealing adhesive layer to be in contact with the second steel shell, rolling and brushing the sealant on the outer side wall of the sealing ring to obtain a second sealing adhesive layer, covering the second steel shell in the first steel shell to enable the second sealing adhesive layer to be in contact with the first steel shell to complete superposition, controlling the heating temperature to be 85 ℃, and performing heating sealing treatment on the mutual superposition part of the first steel shell, the sealing ring and the second steel shell, wherein the heating time is 28 s;
the positive electrode tab and the first steel shell were welded by a resistance welding needle, and the negative electrode tab and the second steel shell were welded by a resistance welding needle, to obtain the button cell of example 3.
Example 4
Providing an electric core assembly, wherein the electric core assembly comprises an electric core main body, a positive electrode lug and a negative electrode lug, the electric core main body comprises a positive plate, a negative plate and a diaphragm, the positive plate, the diaphragm and the negative plate are sequentially laminated, and then the positive plate, the diaphragm and the negative plate are wound to obtain a winding type electric core main body;
providing a first steel shell and a second steel shell, placing the electric core assembly in the first steel shell, and injecting electrolyte;
providing a sealing ring, rolling and brushing a sealant on the inner side wall of the sealing ring to obtain a first sealing adhesive layer, rolling and brushing the sealant on the outer side wall of the sealing ring to obtain a second sealing adhesive layer, placing the sealing ring in a first steel shell to enable the second sealing adhesive layer to be in contact with the first steel shell, covering the second steel shell in the first steel shell to enable the first sealing adhesive layer to be in contact with the second steel shell to complete superposition, controlling the heating temperature to be 85 ℃, and performing heating sealing treatment on the mutual superposition part of the first steel shell, the sealing ring and the second steel shell, wherein the heating time is 28 s;
the positive electrode tab and the first steel shell were welded by a resistance welding needle, and the negative electrode tab and the second steel shell were welded by a resistance welding needle, to obtain the button cell of example 4.
Example 5
Providing an electric core assembly, wherein the electric core assembly comprises an electric core main body, a positive electrode lug and a negative electrode lug, the electric core main body comprises a positive plate, a negative plate and a diaphragm, the positive plate, the diaphragm and the negative plate are sequentially laminated, and then the positive plate, the diaphragm and the negative plate are wound to obtain a winding type electric core main body;
providing a first steel shell and a second steel shell, placing the electric core assembly in the first steel shell, and injecting electrolyte;
providing a sealing ring, arranging a first convex pattern on the inner side wall of the sealing ring, arranging a second convex pattern on the outer side wall of the sealing ring, rolling and brushing a sealant on the inner side wall of the sealing ring to obtain a first sealing glue layer, sleeving the sealing ring on a second steel shell to enable the first sealing glue layer to be in contact with the second steel shell, rolling and brushing the sealant on the outer side wall of the sealing ring to obtain a second sealing glue layer, covering the second steel shell in the first steel shell to enable the second sealing glue layer to be in contact with the first steel shell to complete superposition, controlling the heating temperature to be 85 ℃, and performing heating and sealing treatment on the mutually superposed parts of the first steel shell, the sealing ring and the second steel shell, wherein the heating time is 28 s;
the positive electrode tab and the first steel shell were welded by a resistance welding needle, and the negative electrode tab and the second steel shell were welded by a resistance welding needle, to obtain the button cell of example 5.
Comparative example 1
Providing an electric core assembly, wherein the electric core assembly comprises an electric core main body, a positive electrode lug and a negative electrode lug, the electric core main body comprises a positive plate, a negative plate and a diaphragm, the positive plate, the diaphragm and the negative plate are sequentially laminated, and then the positive plate, the diaphragm and the negative plate are wound to obtain a winding type electric core main body;
providing a first steel shell and a second steel shell, placing the electric core assembly in the first steel shell, and injecting electrolyte;
providing a sealing ring, sleeving the sealing ring on the second steel shell, and covering the second steel shell in the first steel shell to ensure that the sealing ring is arranged between the first steel shell and the second steel shell to complete superposition sealing;
and welding the positive electrode tab and the first steel shell through the resistance welding needle, and welding the negative electrode tab and the second steel shell through the resistance welding needle to obtain the button cell of the comparative example 1.
In the above examples, the thickness of the first sealant layer and the second sealant layer was 0.21mm, and the test results of examples 1, 2, 3, 4, 5 and 1 were shown in table 1.
TABLE 1
As can be seen from the above table, compared with the button cell of comparative example 1, the button cells prepared in examples 1 to 5 all have good sealing performance and cycle life, the cycle life is longer than 600, the sealing performance is better, the service life is longer, and the quality of the button cells prepared in examples 1 to 5 is higher than that of comparative example 1, wherein the button cell obtained in example 5 has the best sealing performance and the lowest weight loss rate, that is, the leakage resistance of the electrolyte is best, which is significantly improved compared with other examples, and also has good cycle life, and meanwhile, the raw material cost and the time energy cost of example 5 are the highest, which can be specifically adjusted according to actual production needs and requirements. The preparation process of each embodiment is simple, the sealing performance and the service life of the button cell can be greatly improved, the quality of the finished button cell product is improved, and the preparation method is suitable for industrial production.
The above-mentioned 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 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 preparation process of a button battery is characterized by comprising the following steps:
providing an electric core assembly, wherein the electric core assembly comprises an electric core main body, a positive electrode lug and a negative electrode lug;
providing a first steel shell and a second steel shell, placing the electric core assembly in the first steel shell, and injecting electrolyte;
providing a sealing ring, arranging sealant on the surface of the sealing ring, superposing the first steel shell, the sealing ring and the second steel shell to ensure that the sealing ring is arranged between the first steel shell and the second steel shell, and heating and sealing the superposed parts of the first steel shell, the sealing ring and the second steel shell;
and welding the positive electrode lug and the first steel shell, and welding the negative electrode lug and the second steel shell to obtain the button battery.
2. The button battery preparation process according to claim 1, wherein the battery cell main body comprises a positive plate, a negative plate and a diaphragm, and the positive plate, the diaphragm and the negative plate are sequentially laminated and then wound to form the battery cell main body.
3. The button cell manufacturing process according to claim 1, wherein in the step of providing the sealant on the surface of the sealing ring and laminating the first steel case, the sealing ring and the second steel case, the sealant is firstly rolled on the inner side wall of the sealing ring to obtain a first sealant layer, the sealing ring is sleeved on the second steel case to contact the first sealant layer with the second steel case, the sealant is then rolled on the outer side wall of the sealing ring to obtain a second sealant layer, the second steel case is covered in the first steel case to contact the second sealant layer with the first steel case, and the lamination is completed.
4. The button cell manufacturing process according to claim 1, wherein in the step of disposing the sealant on the surface of the sealing ring and laminating the first steel case, the sealing ring and the second steel case, the sealant is firstly rolled on the inner sidewall of the sealing ring to obtain a first sealant layer, the sealant is rolled on the outer sidewall of the sealing ring to obtain a second sealant layer, the sealing ring is placed in the first steel case to contact the second sealant layer with the first steel case, and then the second steel case is covered in the first steel case to contact the first sealant layer with the second steel case, thereby completing lamination.
5. The button cell manufacturing process according to claim 3 or 4, wherein in the step of performing heat sealing treatment on the portion where the first steel shell, the seal ring and the second steel shell are laminated, the heating temperature is controlled to be 65-85 ℃ and the heating time is 15-28 s.
6. The button cell manufacturing process according to claim 1, wherein the positive electrode tab and the first steel case are welded by resistance welding in the operation of welding the positive electrode tab and the first steel case.
7. The button cell manufacturing process according to claim 1, wherein the negative electrode tab and the second steel case are welded by resistance welding in the operation of welding the negative electrode tab and the second steel case.
8. A button battery is characterized by comprising a sealing assembly and a battery cell assembly, wherein the battery cell assembly is arranged in the sealing assembly;
the sealing assembly comprises a first steel shell, a second steel shell and a sealing ring, the sealing ring is arranged between the first steel shell and the second steel shell, a first sealing adhesive layer is arranged on the inner side wall of the sealing ring, a second sealing adhesive layer is arranged on the outer side wall of the sealing ring, the first sealing adhesive layer is connected with the second steel shell, the second sealing adhesive layer is connected with the first steel shell, and the first steel shell and the second steel shell are sealed to form a containing cavity;
the electric core assembly is arranged in the accommodating cavity.
9. The button cell of claim 8, wherein the cell assembly comprises a cell main body, a positive tab and a negative tab, the cell main body is disposed in the accommodating cavity, the positive tab is disposed at one end of the cell main body close to the first steel shell, the positive tab is welded to the first steel shell, the negative tab is disposed at one end of the cell main body close to the second steel shell, and the negative tab is welded to the second steel shell.
10. The button cell of claim 9, wherein the cell body is a wound cell body, and the cell body comprises a positive plate, a negative plate and a diaphragm, and the diaphragm is disposed between the positive plate and the negative plate.
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| CN112751116A (en) * | 2021-01-27 | 2021-05-04 | 惠州市德能电池有限公司 | Explosion-proof packaging structure, button battery and packaging method thereof |
| CN112751115A (en) * | 2021-01-27 | 2021-05-04 | 惠州市德能电池有限公司 | Novel packaging structure, button battery and packaging method thereof |
| CN112886047A (en) * | 2021-02-07 | 2021-06-01 | 惠州市德能电池有限公司 | Button cell and manufacturing method thereof |
| CN113937428A (en) * | 2021-09-30 | 2022-01-14 | 广东微电新能源有限公司 | Battery, battery preparation method, battery detection method and electronic equipment |
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