CN113328213B - Manufacturing method of cylindrical lithium battery - Google Patents
Manufacturing method of cylindrical lithium battery Download PDFInfo
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- CN113328213B CN113328213B CN202110458464.7A CN202110458464A CN113328213B CN 113328213 B CN113328213 B CN 113328213B CN 202110458464 A CN202110458464 A CN 202110458464A CN 113328213 B CN113328213 B CN 113328213B
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- steel shell
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 27
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 27
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 24
- 238000007789 sealing Methods 0.000 claims abstract description 102
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 85
- 239000010959 steel Substances 0.000 claims abstract description 85
- 238000005452 bending Methods 0.000 claims abstract description 24
- 238000000034 method Methods 0.000 claims abstract description 20
- 238000001125 extrusion Methods 0.000 claims abstract description 7
- 238000003825 pressing Methods 0.000 claims abstract description 4
- 230000000284 resting effect Effects 0.000 claims abstract description 3
- 230000002093 peripheral effect Effects 0.000 claims description 25
- 239000011324 bead Substances 0.000 claims description 11
- 239000013013 elastic material Substances 0.000 claims description 3
- 238000007493 shaping process Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 abstract description 10
- 230000002411 adverse Effects 0.000 abstract description 3
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 239000003792 electrolyte Substances 0.000 description 7
- 150000001875 compounds Chemical class 0.000 description 6
- 239000005060 rubber Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000009413 insulation Methods 0.000 description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 2
- 238000005253 cladding Methods 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 239000000741 silica gel Substances 0.000 description 2
- 229910002027 silica gel Inorganic materials 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000000123 paper Substances 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0422—Cells or battery with cylindrical casing
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/147—Lids or covers
- H01M50/148—Lids or covers characterised by their shape
- H01M50/152—Lids or covers characterised by their shape for cells having curved cross-section, e.g. round or elliptic
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/183—Sealing members
- H01M50/186—Sealing members characterised by the disposition of the sealing members
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/572—Means for preventing undesired use or discharge
- H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
- H01M50/586—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries inside the batteries, e.g. incorrect connections of electrodes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/572—Means for preventing undesired use or discharge
- H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
- H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
- H01M50/597—Protection against reversal of polarity
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The invention discloses a manufacturing method of a cylindrical lithium battery, which comprises the following steps: pressing the sealing ring into the steel shell from the opening of the steel shell, and clamping the vertical wall of the sealing ring in the side wall of the steel shell; placing the cap assembly with the cap top facing up and the cap rim down into a recess formed by the bottom wall and the vertical wall of the gasket; passing an insulating ring through a cap top of the cap assembly and resting over a cap rim of the cap assembly; the open end of the steel shell is inwards bent to form a curled edge, and the upper end part of the vertical wall of the sealing ring is forced to be bent in the same direction so as to press and hold a part of the outer ring of the insulating ring; the sealing device has the advantages that the battery is prevented from being short-circuited, the service life of the battery is prolonged, the extrusion amount of the bending wall of the sealing ring is increased, the sealing performance of the battery is improved, adverse factors such as heat and ultraviolet light to the battery are not introduced, the process is more convenient and simple, and the cost is more economical.
Description
Technical Field
The invention relates to the field of batteries, in particular to a manufacturing method of a cylindrical lithium battery.
Background
The cylindrical lithium battery has the advantages of high capacity, high output voltage, good charge-discharge cycle performance, stable output voltage, high-current discharge, electrochemical stability, safety in use, wide working temperature range, environmental friendliness and the like, and is increasingly widely applied.
The invention patent with the application number of CN106972190A discloses a sealing method of a cylindrical battery, wherein a circular groove is pressed at the upper edge position of a steel shell far from a first bottom wall and close to a side wall by using a hob, a convex second bottom wall and a convex third bottom wall are formed in the steel shell, a lower rubber ring part of a sealing ring of a cap is abutted with the second bottom wall, and a side rubber ring part is abutted with the side wall of the steel shell; the sealing module presses the upper edge of the side wall of the steel shell, so that the upper edge of the side wall is bent towards the center direction, an inner edge parallel to the second bottom wall is finally formed, and the upper rubber ring part and the lower rubber ring part deform under the action of pressure and are respectively attached to the inner edge and the second bottom wall.
The invention patent with the bulletin number of CN10125709713 is issued, the steel shell is connected with the sealing seat through welding, wherein the sealing seat comprises a sealing plate, a cylinder body extending downwards is arranged on the sealing plate, the explosion-proof component is arranged in the cylinder body and comprises a cover cap and a sealing ring sleeved outside the cover cap, and the sealing ring is tightly fixed between the bending part of the steel shell and the supporting table top.
In these patent documents, the steel shell and the cap are sealed and insulated by the sealing ring, but the sealing ring is easy to age during the storage process of the battery, and electrolyte can flow out from the inside to make the steel shell and the cap conductive, so that the battery is short-circuited; and the steel shell may have a wire at the edge thereof during the molding process, which has a certain flexibility and is easily inserted between the bent portion of the steel shell and the cap, and may cause a short circuit of the battery.
Therefore, a person skilled in the art usually uses pouring sealing compound between the bending part of the steel shell and the cap to realize secondary sealing insulation, but the coating process of the sealing compound is complex and has high cost, and the curing of the sealing compound needs heating or ultraviolet irradiation, so that the performance of the battery can be influenced.
Disclosure of Invention
The invention aims to provide a manufacturing method of a cylindrical lithium battery with excellent leakage-proof insulation performance, simple process and low cost.
The technical scheme adopted for solving the technical problems is as follows: the manufacturing method of the cylindrical lithium battery comprises the following steps,
preparing a steel shell, a sealing ring, a cap assembly and an insulating ring; the steel shell is a cylindrical part with one side open; the sealing ring comprises an annular bottom wall and a vertical wall extending vertically upwards from the outer edge of the bottom wall; the cap assembly comprises a middle convex cap top and a cap brim part at the periphery of the cap top; the insulating ring is of an annular sheet structure, and a circular through hole is formed in the middle of the insulating ring;
pressing the sealing ring into the steel shell from the opening of the steel shell, and clamping the vertical wall of the sealing ring in the side wall of the steel shell;
placing the cap assembly with the cap top facing up and the cap rim down into a recess formed by the bottom wall and the vertical wall of the gasket;
passing an insulating ring through the top of the cap assembly and resting over the brim of the cap assembly;
the open end of the steel shell is bent inwards to form a curled edge, and the upper end of the vertical wall of the sealing ring is forced to be bent in the same direction so as to press and hold a part of the outer ring of the insulating ring.
The preferred technical scheme adopted by the invention for solving the technical problems is as follows: the vertical wall of sealing washer by bending form the bending wall of week lateral wall and the inwards bending of week lateral wall upper end, the diapire support cap subassembly, the week lateral wall hug closely in the lateral wall of tubular part, the bending wall hug closely in the below of turn-up, the inner edge contact cap top's of insulating ring outer peripheral face, the outer fringe of insulating ring stretch into between bending wall and cap rim portion's upper surface, bending wall receive insulating ring and turn-up extrusion deformation realize sealedly.
The preferred technical scheme adopted by the invention for solving the technical problems is as follows: the side wall of the steel shell forms an annular positioning part protruding from outside to inside through an annular notch, and the bottom wall of the sealing ring is extruded between the cap edge part and the annular positioning part.
The preferred technical scheme adopted by the invention for solving the technical problems is as follows: the cap assembly comprises an upper cover and a lower cover which are embedded up and down, the lower cover comprises a wrapping edge wrapping the outer edge of the upper cover, the wrapping edge comprises a peripheral wall and an upper wall which is bent inwards at the upper end of the peripheral wall, and the peripheral wall and the upper wall of the wrapping edge are in transition through an arc section.
The preferred technical scheme adopted by the invention for solving the technical problems is as follows: when the steel shell curled edge forces the vertical wall of the sealing ring to bend and squeeze the insulating ring, the outer edge of the insulating ring bends downwards along with the bending deformation, the insulating ring forms an annular plane and a curved surface bending downwards from the outer edge of the annular plane, and the curved surface is matched with the arc section of the wrapping edge.
The preferred technical scheme adopted by the invention for solving the technical problems is as follows: the insulating ring is made of elastic materials, the inner diameter of the insulating ring is slightly smaller than the outer diameter of the top of the cap, and the insulating ring is in interference fit with the top of the cap.
The preferred technical scheme adopted by the invention for solving the technical problems is as follows: the outer edge of the insulating ring horizontally extends beyond the edge of the curled edge of the steel shell.
The preferred technical scheme adopted by the invention for solving the technical problems is as follows: the distance between the bending wall and the upper surface of the cap edge part is more than one half of the upper wall.
The preferred technical scheme adopted by the invention for solving the technical problems is as follows: the opening part of the steel shell is in a horn shape with a big upper part and a small lower part after annular grooving, and the diameter of the lower end of the vertical wall of the sealing ring is smaller than that of the upper end.
The preferred technical scheme adopted by the invention for solving the technical problems is as follows: after the steel shell is curled, the sealing area of the battery is radially compressed by a sealing shaping device, and the upper end of the steel shell is shaped to the same diameter as the ketone body of the steel shell.
Compared with the prior art, the invention has the advantages that the insulating ring is clamped between the sealing ring and the cap assembly, and the insulating ring isolates the steel shell from the cap edge part of the cap assembly, so that electrolyte flowing out from the gap of the sealing ring is prevented from contacting the cap edge part, and metal wires curled by the steel shell are prevented from contacting the cap edge part, thereby preventing the short circuit of the battery and prolonging the service life of the battery.
Furthermore, the insulating ring increases the extrusion amount of the bending wall of the sealing ring, so that the sealed steel shell is tightly contacted with the sealing ring, and the sealing performance of the battery is improved.
Compared with the process of pouring the sealing glue, the invention only needs to sleeve the insulating ring on the cap assembly, is simple mechanical operation, does not introduce adverse factors such as heat, ultraviolet light and the like to the battery, is more convenient and simple in process and is more economical in cost.
Drawings
The invention will be described in further detail below in connection with the drawings and the preferred embodiments, but it will be appreciated by those skilled in the art that these drawings are drawn for the purpose of illustrating the preferred embodiments only and thus should not be taken as limiting the scope of the invention. Moreover, unless specifically indicated otherwise, the drawings are merely schematic representations, not necessarily to scale, of the compositions or constructions of the described objects and may include exaggerated representations.
Fig. 1 is a schematic view of a cylindrical lithium battery according to a preferred embodiment of the present invention;
FIG. 2 is an enlarged partial schematic view of the portion H of FIG. 1 in accordance with a preferred embodiment of the present invention;
FIG. 3 is a schematic view of a cap assembly in a preferred embodiment of the present invention;
FIG. 4 is a schematic diagram showing an initial state of an insulating ring according to a preferred embodiment of the present invention;
FIG. 5 is a second schematic view showing an initial state of an insulating ring according to a preferred embodiment of the present invention;
FIG. 6 is a schematic view of a preferred mode of insulating ring in a preferred embodiment of the invention;
fig. 7 is a schematic diagram of a step one of a method for manufacturing a cylindrical lithium battery according to a preferred embodiment of the present invention;
fig. 8 is a schematic diagram of a second step of the method for manufacturing a cylindrical lithium battery according to a preferred embodiment of the present invention;
fig. 9 is a schematic diagram illustrating a third step of the method for manufacturing a cylindrical lithium battery according to a preferred embodiment of the present invention.
Detailed Description
Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Those skilled in the art will appreciate that these descriptions are merely illustrative, exemplary, and should not be construed as limiting the scope of the invention.
It should be noted that: like reference numerals denote like items in the following figures, and thus once an item is defined in one figure, it may not be further defined and explained in the following figures.
In the description of the present invention, it should be noted that, the azimuth or positional relationship indicated by the terms "front", "rear", etc. are based on the azimuth or positional relationship shown in the drawings, or the azimuth or positional relationship in which the inventive product is conventionally put in use, are merely for convenience of describing the present invention and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific azimuth, be configured and operated in a specific azimuth, and therefore, should not be construed as limiting the present invention.
A cylindrical lithium battery comprises a steel shell, wherein the steel shell is sealed through a sealing structure to form a closed space in an inner cavity of the steel shell, a battery cell is arranged in the closed space, and electrolyte can flow in the closed space.
As shown in fig. 1 and 2, the present embodiment provides a cylindrical lithium battery including a steel case 1, a seal ring 2, a cap assembly 3, and an insulating ring 4.
The structure of each component of the battery is described below to facilitate the understanding of the method for manufacturing the cylindrical lithium battery and the final sealing structure by those skilled in the art.
As shown in fig. 7, the steel shell 1 is a cylindrical member having a circular bottom and annular side walls and having an opening on one side. The steel shell 1 is formed by punching a stainless steel sheet or a nickel-plated steel sheet, or by subjecting a carbon steel sheet to a nickel plating treatment after being formed by punching.
As shown in fig. 7, the gasket 2 includes a transversely disposed annular bottom wall 21 and a vertical wall 22 extending vertically upward from the outer periphery of the bottom wall 21, and the bottom wall 21 and the vertical wall 22 enclose an upwardly open recess.
As shown in fig. 3 and 8, the cap assembly 3 has a top hat shape including a middle convex cap top 31 and a horizontally extending annular cap rim portion 32 surrounding the cap top 31.
As shown in fig. 4 and 5, the insulating ring 4 has an annular sheet-like structure with a circular through hole K in the middle thereof so that the wall of the circular through hole K, that is, the inner edge 41 of the insulating ring and the outer edge 42 of the insulating ring are coaxial.
By utilizing the accessory, the manufacturing method of the cylindrical lithium battery specifically comprises the following steps:
step one, as shown in fig. 7, the sealing ring 2 is pressed into the steel shell 1 from the opening of the steel shell 1 and clamped in the side wall of the steel shell 1.
Step two, as shown in fig. 8, the cap assembly 3 is put into the recess formed by the bottom wall 21 and the vertical wall 22 of the gasket 2 with the cap top 31 facing downward toward the cap rim 32.
Step three, as shown in fig. 9, the circular through hole K of the insulating ring 4 is passed through the cap top 31 of the cap assembly 3, and the insulating ring 4 is allowed to rest above the cap rim 32 of the cap assembly 3.
Step four, as shown in fig. 1 and 2, the open end of the steel shell 1 is bent inwards to form a curled edge 11, and the vertical wall 22 of the sealing ring 2 is forced to be bent in the same direction to form a peripheral side wall 22a and a bent wall 22b, the peripheral side wall 22a is located between the steel shell side wall and the cap rim portion 32 of the cap assembly 3, and the bent wall 22b presses a part of the outer ring of the insulating ring 4.
As shown in fig. 1 and 2, the final sealing structure manufactured by the above-mentioned method for manufacturing a sealing structure is specifically described as follows:
the steel shell 1 of the tubular part comprises a vertical side wall and an inwardly bent bead 11 at the open end of the steel shell 1 and at the upper end of the side wall.
The gasket 2 includes a bottom wall 21, a peripheral side wall 22a, and a bent wall 22b bent inward at the upper end of the peripheral side wall 22a, wherein the bottom wall 21 supports the cap assembly 3, the peripheral side wall 22a is abutted against the inside of the side wall of the tubular member, and the bent wall 22b of the gasket 2 is abutted against the lower side of the bead 11.
Further, the cap rim 32 of the cap assembly 3 is wrapped in the enclosed region of the bottom wall 21, the peripheral side wall 22a and the folded wall 22b of the gasket 2; that is, the lower surface of the cap rim portion 32 is bonded to the bottom wall 21 of the seal ring 2, the outer peripheral surface of the cap rim portion 32 is bonded to the peripheral side wall 22a of the seal ring 2, and the upper surface of the cap rim portion 32 is bonded to the bent wall 22b of the seal ring 2.
Next, the insulating ring 4 is sleeved outside the cap top 31, the inner edge 41 of the insulating ring contacts the outer peripheral surface of the cap top 31, the outer edge 42 of the insulating ring extends between the lower surface of the bending wall 22b and the upper surface of the cap rim 32, and the bending wall 22b is elastically compressed by the extrusion deformation of the insulating ring 4 and the curled edge 11 to realize sealing.
The battery structure of the cylindrical lithium battery provided in this embodiment is compared with the conventional battery structure, and the advantages of the battery structure and the manufacturing method of this embodiment are explained below.
The battery structure of the conventional structure has no insulating ring, and the steel shell and the cap assembly are sealed and insulated by the sealing ring, but the sealing ring is easy to age in the storage process of the battery, and electrolyte flows out from the inside to the cap rim part, so that the steel shell and the cap assembly are electrically conductive, and the battery is short-circuited. In addition, the steel can may have a wire at its edge during the forming process, which has a certain flexibility to easily enter into the gap between the bead 11 of the steel can and the cap top of the cap assembly, so that the wire of the bead 11 contacts the cap rim located in the gap to cause a short circuit of the battery.
In the battery structure of this embodiment, the inner edge 41 of the insulating ring contacts the outer peripheral surface of the cap top 31, and the outer edge 42 of the insulating ring extends between the lower surface of the bent wall 22b and the upper surface of the cap rim 32, so that the insulating ring 4 separates the steel can 1 from the cap rim 32 of the cap assembly 3, thereby avoiding the short circuit of the battery caused by the contact of the wire of the bead 11 with the cap rim 32.
In addition, due to the isolation of the insulating ring 4, the electrolyte flowing out of the gap of the sealing ring 2 cannot contact the cap edge part 32, so that the conduction of the anode and the cathode of the battery is avoided, the battery is not disabled even if the battery has slight leakage, and the service life of the battery is prolonged.
Further, the insulating ring 4 extends between the lower surface of the bent wall 22b of the sealing ring 2 and the upper surface of the cap rim portion 32, so that the extrusion amount of the bent wall 22b of the sealing ring 2 is increased, the sealed steel shell 1 is tightly contacted with the sealing ring 2, and the sealing performance of the battery is improved.
In addition, if it is desired to avoid the short circuit of the battery in the conventional structure, it is generally adopted to fill the sealing compound between the bead 11 of the steel can 1 and the cap assembly 3 to realize the secondary sealing and insulation, but the coating process of the sealing compound is complicated and has high cost, and the curing of the sealing compound requires heating or ultraviolet irradiation, thus affecting the performance of the battery.
In this embodiment, the insulating ring 4 is only required to be sleeved on the cap assembly 3, so that the mechanical operation is simple, and adverse factors such as heat and ultraviolet light to the battery are not introduced. And compared with the complex process of pouring the sealing glue, the insulating ring 4 is obviously more convenient and simpler in process and more economical in cost.
Further preferably, the above battery structure is such that the outer edge 42 of the insulating ring extends horizontally beyond the edge of the bead 11 of the steel can 1. That is, when the outer edge 42 of the insulating ring is protruded between the lower surface of the bent wall 22b and the upper surface of the cap rim portion 32, the outer edge 42 of the insulating ring is horizontally formed between the side wall of the steel can 1 and the edge of the bead 11, so that the outer end of the insulating ring 4 is more stably pressed.
In terms of the choice of the material of the insulating ring 4, the insulating ring 4 may be made of any one of insulating paper, plastic, rubber, silica gel, and mica.
And the thickness of the insulating ring 4 is preferably 0.5-1.5 mm in order to ensure a certain amount of compression of the bent wall 22b of the sealing ring 2 while avoiding the influence on the sealing dimension.
In addition, in this embodiment, it is further preferable that the insulating ring 4 is made of an elastic material, preferably a corrosion-resistant plastic, rubber or silica gel, and the inner diameter of the insulating ring 4 is slightly smaller than the outer diameter of the cap top 31, and the insulating ring 4 is in interference fit with the cap top 31, so that the isolation degree of the insulating ring 4 between the curled edge 11 of the steel can 1 and the cap rim 32 of the cap assembly 3 is further improved, and the short circuit of the battery caused by the electrolyte flowing to the cap rim 32 is avoided.
In order to facilitate the assembly of the insulating ring 4, the outer circumferential surface of the cap top 31 is a conical surface with a smaller top and a larger bottom, that is, the diameter of the upper part of the cap top 31 is smaller than that of the lower part, so that the insulating ring 4 is sleeved in a guiding function.
It should be noted that the inner edge 41 of the insulating ring may also be provided with an upwardly protruding collar. Because of the provision of the convex ring, the electrolyte flowing out of the seal gap of the seal ring 2 does not flow along the surface of the insulating ring 4 to the outer peripheral surface of the cap top 31. Further, after final sealing, the upper surface of the collar is substantially the same height as the bead 11 of the battery or slightly higher than the bead 11, further improving insulation between the steel can 1 and the cap assembly 3.
As shown in fig. 1, 2 and 7-9, in this example, as a preferred embodiment of the cylindrical lithium battery, an annular notch is formed in an upper section of the cylindrical steel can 1 near the open end, so that an annular positioning portion 12 is formed by inward pressing at the notch, and the steel can 1 is divided into a lower cell region and an upper sealing region by the annular positioning portion 12. The cell area accommodates the cell, and the sealing area is provided with the sealing structure of the embodiment.
When the score wheel presses the outer wall of the steel shell 1 from the outside, the side wall portion of the steel shell 1, on which the score wheel acts, is recessed inward, so that an annular raised annular positioning portion 12 is formed in the steel shell 1. When sealing, the sealing ring 2 is pressed into the steel shell 1 and is positioned due to the limitation of the annular positioning part 12, so that the sealing ring 2 is prevented from moving further downwards. Meanwhile, the annular positioning part 12 provides upward supporting force for the sealing ring 2, and the bottom wall 21 of the sealing ring 2 is extruded to realize the sealing between the annular positioning part 12 of the steel shell 1 and the cap assembly 3, so that the sealing strength and the sealing performance of the battery are further improved.
As shown in fig. 2 and 3, as a more specific embodiment of the cylindrical lithium battery, the cap assembly 3 in this example includes an upper cover 3a and a lower cover 3b that are fitted up and down. The upper cover 3a includes an annular lower wall 301 corresponding to the brim portion 32, the lower cover 3b includes a bottom plate 302 and a rim 303 wrapping an outer edge portion of the upper cover 3a, the rim 303 includes a peripheral wall 303a and an upper wall 303b having an upper end bent inward of the peripheral wall, and the bottom plate 302 and the rim 303 enclose to form an annular groove. The lower wall 301 of the upper cover 3a is fitted into the annular groove, the upper wall of the wrapping 303 covers the upper surface of the lower wall 301 of the upper cover 3a, the peripheral wall wraps the side surface of the lower wall 301 of the upper cover 3a, and the outer edge 42 of the insulating ring extends between the bent wall 22b of the seal ring 2 and the upper wall 303b of the lower cover 3b.
Further, a sealing body sealing ring P is provided in the annular groove, and the sealing body sealing ring P is used for sealing the gap between the upper cover 3a and the lower cover 3b.
More preferably, the distance between the outer edge 42 of the insulating ring extending into the folded wall 22b of the sealing ring 2 and the upper surface of the cap rim portion 32 of the cap assembly 3 is greater than one half of the upper wall 303b, so that the insulating ring 4 is more firmly connected between the sealing ring 2 and the cap assembly 3.
In the present embodiment, as shown in fig. 3, the peripheral wall and the upper wall of the cap assembly 3 of the cladding 303 are transited by the circular arc section d, and as shown in fig. 2, the insulating ring 4 includes an annular plane e and a curved surface f formed by bending downward from the outer edge of the annular plane, which matches the circular arc section d of the cladding 303. This improves the connection reliability of the insulating ring 4.
Of course, as shown in fig. 4 and 5, in the initial state, the insulating ring 4 may have only an annular plane e, and the insulating ring 4 is pressed to form a curved surface f when the vertical wall of the sealing ring is forced to bend by the subsequent steel shell curling.
And as shown in fig. 6, preferably, the insulating ring 4 is prefabricated in a shape formed by an annular plane e and a curved surface f, so that when the peripheral side wall 22a of the sealing ring 2 is bent and then attached to the outer surface of the cap assembly 3, the supporting gap between the sealing ring 2 and the cap assembly 3 at the outer edge 42 of the insulating ring can be as small as possible, so that the sealing ring 2 and the cap assembly 3 are in closer contact, and the sealing performance of the battery is improved.
In addition, as a further optimized technical scheme of the manufacturing method, in the embodiment, when the steel shell 1 is notched in a ring shape, a sealing area of the steel shell 1 is in a horn shape, and the peripheral side wall 22a of the corresponding sealing ring 2 is in a horn shape, so that the small-diameter part of the sealing ring 2 smoothly enters the steel shell 1 to play a guiding role; as the insertion depth of the seal ring 2 increases, the compression amount of the seal ring 2 and the steel shell 1 gradually increases. After the sealing is finished, the sealing area of the battery is radially compressed through sealing shaping equipment, the upper end of the steel shell 1 is shaped to the same diameter as the lower end cylinder of the steel shell 1, and therefore the manufacturing of the battery is finished. Such an operation makes it possible to increase the amount of extrusion of the sealing ring 2 and the steel shell 1 with minimal mechanical damage.
The above description is made in detail on the method for manufacturing the cylindrical lithium battery provided by the invention, and specific examples are applied herein to illustrate the principles and embodiments of the invention, and the above examples are only for helping to understand the invention and core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.
Claims (9)
1. The manufacturing method of the cylindrical lithium battery is characterized by comprising the following steps,
preparing a steel shell, a sealing ring, a cap assembly and an insulating ring; the steel shell is a cylindrical part with one side open; the sealing ring comprises an annular bottom wall and a vertical wall extending vertically upwards from the outer edge of the bottom wall; the cap assembly comprises a middle convex cap top and a cap brim part at the periphery of the cap top; the insulating ring is of an annular sheet structure, and a circular through hole is formed in the middle of the insulating ring;
pressing the sealing ring into the steel shell from the opening of the steel shell, and clamping the vertical wall of the sealing ring in the side wall of the steel shell;
placing the cap assembly with the cap top facing up and the cap rim down into a recess formed by the bottom wall and the vertical wall of the gasket;
passing an insulating ring through the top of the cap assembly and resting above the brim of the cap assembly and within the vertical wall of the sealing ring;
bending the open end of the steel shell inwards to form a curled edge, and forcing the upper end of the vertical wall of the sealing ring to bend in the same direction so as to press a part of the outer ring of the insulating ring;
the vertical wall of sealing washer by bending form the bending wall of week lateral wall and the inwards bending of week lateral wall upper end, the diapire support cap subassembly, the week lateral wall hug closely in the lateral wall of tubular part, the bending wall hug closely in the below of turn-up, the inner edge contact cap top's of insulating ring outer peripheral face, the outer fringe of insulating ring stretch into between bending wall and cap rim portion's upper surface, bending wall receive insulating ring and turn-up extrusion deformation realize sealedly.
2. The method of manufacturing a cylindrical lithium battery according to claim 1, wherein the sidewall of the steel can is formed with an annular positioning portion protruding from the outside to the inside through an annular notch, and the bottom wall of the sealing ring is pressed between the cap rim portion and the annular positioning portion.
3. The method of manufacturing a cylindrical lithium battery according to claim 1, wherein the cap assembly comprises an upper cap and a lower cap which are vertically embedded, the lower cap comprises a wrapping edge wrapping an outer edge of the upper cap, the wrapping edge comprises a peripheral wall and an upper wall with an upper end of the peripheral wall bent inwards, and the peripheral wall and the upper wall of the wrapping edge are transited through an arc section.
4. The method of manufacturing a cylindrical lithium battery according to claim 3, wherein when the steel shell is curled to force the vertical wall of the sealing ring to bend and press the insulating ring, the outer edge of the insulating ring is bent downwards along with the bending deformation, the insulating ring forms an annular plane and a curved surface bent downwards from the outer edge of the annular plane, and the curved surface is matched with the arc section of the wrapping edge.
5. The method for manufacturing a cylindrical lithium battery according to claim 1, wherein the insulating ring is made of an elastic material, the inner diameter of the insulating ring is slightly smaller than the outer diameter of the top of the cap, and the insulating ring is in interference fit with the top of the cap.
6. The method of manufacturing a cylindrical lithium battery according to claim 1, wherein the outer edge of the insulating ring is horizontally beyond the edge of the bead of the steel can.
7. The method of claim 4, wherein the distance between the folded wall and the upper surface of the brim is greater than one half of the upper wall.
8. The method for manufacturing a cylindrical lithium battery according to claim 1, wherein the opening of the steel shell is horn-shaped with a large upper part and a small lower part after the annular groove is formed in the steel shell, and the diameter of the lower end of the vertical wall of the sealing ring is smaller than that of the upper end of the vertical wall.
9. The method of manufacturing a cylindrical lithium battery according to claim 8, wherein after the steel can is curled, the sealing area of the battery is radially compressed by a sealing and shaping device, and the upper end of the steel can is shaped to have the same diameter as the lower end cylinder of the steel can.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010009841A (en) * | 2008-06-25 | 2010-01-14 | Panasonic Corp | Cylindrical sealed battery |
| WO2010148800A1 (en) * | 2009-06-23 | 2010-12-29 | 深圳市比克电池有限公司 | Battery assembled cap, cylindrical battery with the cap and method for making the same |
| WO2020111275A1 (en) * | 2018-11-30 | 2020-06-04 | パナソニックＩｐマネジメント株式会社 | Battery |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07320703A (en) * | 1994-05-20 | 1995-12-08 | Hitachi Maxell Ltd | Cylindrical manganese dry battery |
| JP2001332226A (en) * | 2000-05-23 | 2001-11-30 | Toshiba Battery Co Ltd | Alkaline dry battery |
| JP2007200754A (en) * | 2006-01-27 | 2007-08-09 | Toshiba Battery Co Ltd | Alkaline dry cell |
| CN101257097B (en) * | 2007-03-02 | 2012-03-14 | 深圳市比克电池有限公司 | Improved battery seal component and battery |
| KR101514827B1 (en) * | 2013-02-26 | 2015-04-23 | 주식회사 엘지화학 | Secondary battery and method for manufacturing the same |
| JP6683150B2 (en) * | 2017-02-21 | 2020-04-15 | トヨタ自動車株式会社 | Cylindrical battery |
| CN106972190A (en) * | 2017-05-31 | 2017-07-21 | 深圳市沃特玛电池有限公司 | A kind of cylindrical battery mouth-sealing method |
| CN109461850B (en) * | 2018-09-14 | 2021-08-20 | 江苏海四达电源股份有限公司 | Lithium ion battery cap and lithium ion battery |
| CN111900452B (en) * | 2020-06-24 | 2022-05-10 | 先进储能材料国家工程研究中心有限责任公司 | Vertical sealed cylindrical battery and preparation method thereof |
-
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010009841A (en) * | 2008-06-25 | 2010-01-14 | Panasonic Corp | Cylindrical sealed battery |
| WO2010148800A1 (en) * | 2009-06-23 | 2010-12-29 | 深圳市比克电池有限公司 | Battery assembled cap, cylindrical battery with the cap and method for making the same |
| WO2020111275A1 (en) * | 2018-11-30 | 2020-06-04 | パナソニックＩｐマネジメント株式会社 | Battery |
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