CN113328213A - Method for manufacturing cylindrical lithium battery - Google Patents
Method for manufacturing cylindrical lithium battery Download PDFInfo
- Publication number
- CN113328213A CN113328213A CN202110458464.7A CN202110458464A CN113328213A CN 113328213 A CN113328213 A CN 113328213A CN 202110458464 A CN202110458464 A CN 202110458464A CN 113328213 A CN113328213 A CN 113328213A
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- Prior art keywords
- wall
- ring
- cap
- insulating ring
- steel shell
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 21
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 21
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 title claims description 23
- 238000007789 sealing Methods 0.000 claims abstract description 101
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 83
- 239000010959 steel Substances 0.000 claims abstract description 83
- 238000005452 bending Methods 0.000 claims abstract description 18
- 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 26
- 239000011324 bead Substances 0.000 claims description 12
- 239000013013 elastic material Substances 0.000 claims description 3
- 238000007493 shaping process Methods 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 238000001125 extrusion Methods 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 abstract description 4
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 239000003792 electrolyte Substances 0.000 description 7
- 150000001875 compounds Chemical class 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 239000005060 rubber Substances 0.000 description 6
- 238000009413 insulation Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000012212 insulator Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 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
- 238000003860 storage Methods 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000000576 coating method Methods 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
- 238000002788 crimping Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 239000000123 paper Substances 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 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 into a groove formed by the bottom wall and the vertical wall of the sealing ring in a downward direction of the brim part with the top of the cap facing upward; passing an insulating ring through a crown portion of the cap assembly and resting above a brim portion of the cap assembly; bending the opening end of the steel shell inwards to form a curled edge, and forcing the upper end part of the vertical wall of the sealing ring to bend in the same direction to press and hold a part of the outer ring of the insulating ring; the advantage is that prevent the battery short circuit, has prolonged the life of battery, has increased the extrusion volume of the wall of bending of sealing washer, has improved the sealing performance of battery, can not introduce heat and ultraviolet ray etc. to the unfavorable factor of battery, and convenient simple more in the technology, also more economical in the cost.
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, capability of discharging with large current, stable electrochemical performance, safety in use, wide working temperature range, environmental friendliness and the like, thereby being increasingly widely applied.
The invention patent with the application number of CN106972190A discloses a sealing method of a cylindrical battery, wherein a hob is utilized to press a circular groove at the position of the upper edge of a steel shell, which is far away from a first bottom wall and close to a side wall, in the steel shell, a second bottom wall and a third bottom wall which are protruded are formed, a lower rubber ring part of a sealing ring of a cover cap is abutted against the second bottom wall, and a side rubber ring part is abutted against the side wall of the steel shell; the sealing module presses the upper edge of the side wall of the steel shell to bend the upper edge of the side wall towards the circle center direction, and finally an inner edge parallel to the second bottom wall is 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.
In the patent with the publication number of CN10125709713, the steel shell and the sealing seat are connected by welding, wherein the sealing seat comprises a sealing plate, a cylinder extending downwards is arranged on the sealing plate, an explosion-proof assembly is arranged in the cylinder, the explosion-proof assembly comprises a cap and a sealing ring sleeved outside the cap, and the sealing ring is tightly fixed between the bending part of the steel shell and the supporting table surface.
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 storage of the battery, and the electrolyte can flow out from the inside to conduct electricity between the steel shell and the cap, thereby causing short circuit of the battery; and the edge of the steel shell may have a metal wire during the forming process, and the metal wire has certain flexibility and is easy to enter between the bent part of the steel shell and the cap, so that the short circuit of the battery can be caused.
For this reason, those skilled in the art generally pour a sealing compound between the bent portion of the steel can and the cap to achieve secondary sealing insulation, but the application process of the sealing compound is complicated and costly, and the curing of the sealing compound requires heating or ultraviolet irradiation, which may affect the performance of the battery.
Disclosure of Invention
The invention aims to provide a manufacturing method of a cylindrical lithium battery with excellent leakage-proof insulating property, simple process and lower cost.
The technical scheme adopted by the invention 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 component with an opening at one side; the sealing ring comprises an annular bottom wall and a vertical wall extending upwards from the outer edge of the bottom wall in the vertical direction; the cap assembly comprises a cap top part with a convex middle part and a brim part at the periphery of the cap top part; 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 into a groove formed by the bottom wall and the vertical wall of the sealing ring in a downward direction of the brim part with the top of the cap facing upward;
penetrating an insulating ring through the top of the cap assembly and resting above the brim of the cap assembly;
and bending the opening end of the steel shell inwards to form a curled edge, and forcing the upper end part of the vertical wall of the sealing ring to bend in the same direction 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 be bent and form all lateral walls and all lateral walls upper end incurved wall of bending, the diapire support cap subassembly, all lateral walls hug closely in the lateral wall of tube-shape part, the wall of bending hug closely in the below of turn-up, the inner edge contact cap top's of insulator ring outer peripheral face, the outer fringe of insulator ring stretch into the wall of bending with the upper surface of brim portion between, the wall of bending receive insulator ring and turn-up extrusion deformation realize sealed.
The preferred technical scheme adopted by the invention for solving the technical problems is as follows: the side wall of the steel shell is provided with an annular positioning part protruding from outside to inside through an annular notch groove, and the bottom wall of the sealing ring is extruded between the brim part and the annular positioning part.
The preferred technical scheme adopted by the invention for solving the technical problems is as follows: the cap component comprises an upper cover and a lower cover which are vertically embedded, the lower cover comprises a covered edge which wraps the outer edge part of the upper cover, the covered edge comprises a peripheral wall and an upper wall, the upper end of the peripheral wall is bent inwards, and the peripheral wall and the upper wall of the covered edge are transited through an arc section.
The preferred technical scheme adopted by the invention for solving the technical problems is as follows: when the vertical wall of sealing washer was buckled and when extrudeing the insulating ring when the box hat turn-up forced, the outer fringe that the insulating ring included warp with it in the downwarping, the insulating ring form cyclic annular plane and follow the curved surface of downwarping outward from cyclic annular plane, the curved surface and the circular arc section that bordures match.
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 cap top, and the insulating ring is sleeved on the cap top in an interference mode.
The preferred technical scheme adopted by the invention for solving the technical problems is as follows: the outer edge of the insulating ring exceeds the edge of the turned edge of the steel shell in the horizontal direction.
The preferred technical scheme adopted by the invention for solving the technical problems is as follows: the distance between the upper surface extending into the bent wall and the brim 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 ring-shaped groove is in a horn shape with a large top and a small bottom, 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 through a sealing shaping device, and the upper end of the steel shell is shaped to the diameter which is the same as the diameter of 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 component and isolates the cap edge part of the steel shell and the cap component, so that the electrolyte flowing out of the gap of the sealing ring is prevented from contacting the cap edge part, the metal wire of the steel shell edge is also prevented from contacting the cap edge part, the short circuit of the battery is prevented, and the service life of the battery is prolonged.
Furthermore, the insulating ring increases the extrusion amount of the bent 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 technology of pouring the sealing glue, the technology of the invention only needs to sleeve the insulating ring on the cap component, is simple mechanical operation, does not introduce heat, ultraviolet light and other factors which are unfavorable for the battery, and is more convenient and simpler in technology and more economic in cost.
Drawings
The present invention will be described in further detail below with reference to the drawings and preferred embodiments, but those skilled in the art will appreciate that the drawings are only drawn for the purpose of illustrating the preferred embodiments and therefore should not be taken as limiting the scope of the invention. Furthermore, unless specifically stated otherwise, the drawings are merely schematic representations based on conceptual representations of elements or structures depicted and may contain exaggerated displays and are not necessarily drawn to scale.
Fig. 1 is a schematic view of a cylindrical lithium battery in a preferred embodiment of the present invention;
FIG. 2 is an enlarged partial schematic view at 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 first schematic view of an initial state of an insulating ring in a preferred embodiment of the present invention;
FIG. 5 is a second schematic view of an initial state of an insulating ring in a preferred embodiment of the present invention;
FIG. 6 is a schematic illustration of a preferred form of an insulating ring in a preferred embodiment of the invention;
FIG. 7 is a schematic diagram of a first step of a method for manufacturing a cylindrical lithium battery according to a preferred embodiment of the present invention;
FIG. 8 is a diagram illustrating a second step of the method for fabricating a cylindrical lithium battery according to a preferred embodiment of the present invention;
fig. 9 is a schematic diagram of a third step of the method for manufacturing a cylindrical lithium battery in a preferred embodiment of the present invention.
Detailed Description
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Those skilled in the art will appreciate that the description is illustrative only, and is not to be construed as limiting the scope of the invention.
It should be noted that: like reference numerals refer to 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 subsequent figures.
In the description of the present invention, it should be noted that the terms "front" and "back" and the like indicate orientations and positional relationships based on orientations and positional relationships shown in the drawings or orientations and positional relationships where the products of the present invention are conventionally placed in use, and are used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements to be referred must have a specific orientation, be constructed in a specific orientation, and be operated, and thus 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 core is installed 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 can 1, a sealing ring 2, a cap assembly 3, and an insulating ring 4.
The structure of each component of the battery is explained below, so that those skilled in the art can more clearly understand the manufacturing method and the final sealing structure of the cylindrical lithium battery.
As shown in fig. 7, the steel shell 1 is a cylindrical member with one side open, which is enclosed by a circular bottom and a ring-shaped side wall. The steel shell 1 is formed by punching a stainless steel sheet or a nickel-plated steel sheet, or is formed by punching a carbon steel sheet and then nickel-plated.
As shown in fig. 7, the sealing ring 2 includes a transversely disposed annular bottom wall 21 and a vertical wall 22 extending vertically upward from an outer edge of the bottom wall 21, and the bottom wall 21 and the vertical wall 22 enclose a groove with an upward opening.
As shown in fig. 3 and 8, the cap assembly 3 has a top hat shape including a centrally convex top hat portion 31 and a horizontally extending annular brim portion 32 at the periphery of the top hat portion 31.
As shown in fig. 4 and 5, the insulating ring 4 is a ring-shaped sheet structure, and a circular through hole K is formed in the middle of the insulating ring, so that the hole wall of the circular through hole K, i.e. 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 placed into the groove formed by the bottom wall 21 and the vertical wall 22 of the seal ring 2 in a direction that the cap top 31 faces the upper cap brim 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 rested above the brim 32 of the cap assembly 3.
And step four, as shown in fig. 1 and 2, bending the open end of the steel shell 1 inwards to form a bead 11, and forcing the vertical wall 22 of the sealing ring 2 to bend in the same direction to form a peripheral side wall 22a and a bent wall 22b, wherein the peripheral side wall 22a is located between the steel shell side wall and the brim part 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 manufacturing method of the sealing structure is specifically explained as follows:
the steel shell 1 of the cylindrical component comprises a vertical side wall and an inward-bent turned edge 11 which is positioned at the opening end of the steel shell 1 and is positioned at the upper end of the side wall.
The seal ring 2 includes a bottom wall 21, a peripheral side wall 22a, and a bent wall 22b formed by bending the upper end of the peripheral side wall 22a inward, wherein the bottom wall 21 supports the cap assembly 3, the peripheral side wall 22a is closely fitted into the side wall of the cylindrical member, and the bent wall 22b of the seal ring 2 is closely fitted below the bead 11.
Then, the brim portion 32 of the cap assembly 3 is wrapped in the enclosed area of the bottom wall 21, the peripheral side wall 22a and the bent wall 22b of the seal ring 2; that is, the lower surface of the brim portion 32 is bonded to the bottom wall 21 of the seal ring 2, the outer peripheral surface of the brim portion 32 is bonded to the peripheral side wall 22a of the seal ring 2, and the upper surface of the brim 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, an inner edge 41 of the insulating ring contacts the outer circumferential surface of the cap top 31, an outer edge 42 of the insulating ring extends between the lower surface of the bent wall 22b and the upper surface of the brim portion 32, and the bent wall 22b is elastically compressed by the extrusion deformation of the insulating ring 4 and the bead 11 to realize sealing.
The advantages of the battery structure and the manufacturing method of the present embodiment are explained by comparing the battery structure of the cylindrical lithium battery provided by the present embodiment with the conventional battery structure.
There is not the insulating ring in the battery structure of traditional structure, passing through between steel casing and the cap subassembly the sealing washer seal with insulating, but the battery is ageing easily at the storage in-process sealing washer, and electrolyte can flow out from inside, flows to the brim of a hat portion on, and makes between steel casing and the cap subassembly electrically conductive to cause the battery short circuit. In addition, the steel can may have a wire at its edge during the forming process, which has some 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 brim portion located in the gap to cause a short circuit of the battery.
In the battery structure of the present embodiment, the inner edge 41 of the insulating ring contacts the outer circumferential 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 brim portion 32, so that the insulating ring 4 separates the steel can 1 from the brim portion 32 of the cap assembly 3, thereby preventing the wire of the bead 11 from contacting the brim portion 32 to cause a short circuit of the battery.
Moreover, due to the isolation of the insulating ring 4, the electrolyte flowing out from the gap of the sealing ring 2 can not contact the brim part 32, so that the conduction of the anode and the cathode of the battery is avoided, the battery cannot be failed even if slight leakage occurs in the battery, and the service life of the battery is prolonged.
Furthermore, the insulation ring 4 extends between the lower surface of the bent wall 22b of the sealing ring 2 and the upper surface of the brim part 32, so that the extrusion amount of the bent wall 22b of the sealing ring 2 is increased, the steel shell 1 is tightly contacted with the sealing ring 2 after sealing, and the sealing performance of the battery is improved.
In addition, in the conventional structure, if the short circuit of the battery is to be avoided, the sealing compound is generally poured between the rolled edge 11 of the steel can 1 and the cap assembly 3 to realize secondary sealing insulation, but the coating process of the sealing compound is complicated and high in cost, and the curing of the sealing compound requires heating or ultraviolet irradiation, thereby affecting the performance of the battery.
In the embodiment, the insulating ring 4 is only required to be sleeved on the cap assembly 3, and the simple mechanical operation is adopted, so that adverse factors such as heat, ultraviolet light and the like to the battery are not introduced. Compared with the complex process of pouring the sealing glue, the process of adding the insulating ring 4 is more convenient and simpler obviously, and the cost is more economic.
It is further preferred for the above cell construction that the outer edge 42 of the insulating ring extends horizontally beyond the edge of the rolled edge 11 of the steel can 1. That is, the outer edge 42 of the insulating ring is extended between the lower surface of the bent wall 22b and the upper surface of the brim portion 32, the outer edge 42 of the insulating ring is horizontally interposed 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 held.
In terms of the material selection 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 in order to ensure a certain amount of squeezing of the bent wall 22b of the sealing ring 2 while avoiding an influence on the size of the seal, the thickness of the insulating ring 4 is preferably 0.5 to 1.5 mm.
In addition, in the present embodiment, it is further preferable that the insulating ring 4 is made of an elastic material, preferably, corrosion-resistant plastic or rubber or silicone, 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 as to further improve the isolation degree of the insulating ring 4 from the bead 11 of the steel shell 1 and the brim 32 of the cap assembly 3, and prevent electrolyte from flowing to the brim 32 to cause short circuit of the battery.
In order to facilitate the assembly of the insulating ring 4, the outer circumference of the cap top 31 is a tapered surface with a smaller top and a larger bottom, i.e. the diameter of the upper part of the cap top 31 is smaller than that of the lower part, so as to guide the insertion of the insulating ring 4.
It should be noted that the inner edge 41 of the insulating ring may also be provided with an upwardly projecting 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 to the outer peripheral surface of the cap top 31 along the surface of the insulating ring 4. After further final sealing, the upper surface of the bulge loop is substantially at the same height as the battery bead 11 or slightly higher than the bead 11, further improving the insulation between the steel can 1 and the cap assembly 3.
As shown in fig. 1, 2, and 7-9, as a preferred embodiment of the cylindrical lithium battery, in this embodiment, an upper section of the cylindrical steel shell 1 near the open end is processed by annular notching, so as to form an annular positioning portion 12 by pressing inward at the notched position, and the steel shell 1 is divided into a lower-side power core region and an upper-side sealing region by using the annular positioning portion 12 as a boundary. Electric core district holding electricity core, the seal district sets up the seal structure of this embodiment.
When the score wheel extrudes the outer wall of the steel shell 1 from the outside, the side wall part of the steel shell 1 acted by the score wheel is recessed inwards, so that an annular positioning part 12 protruding in an annular shape is formed in the steel shell 1. During 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 further moving 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 of 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, the cap assembly 3 of the present embodiment includes an upper cover 3a and a lower cover 3b which are fitted to each other in the upper and lower direction, as a more specific embodiment of the cylindrical lithium battery. The upper cover 3a comprises a ring-shaped lower wall 301 corresponding to the brim part 32, the lower cover 3b comprises a bottom plate 302 and a covered edge 303 wrapping the outer brim part of the upper cover 3a, the covered edge 303 comprises a peripheral wall 303a and an upper wall 303b bending inwards at the upper end of the peripheral wall, and the bottom plate 302 and the covered edge 303 enclose to form a ring-shaped groove. The lower wall 301 of the upper cover 3a is inserted into the annular groove, the upper wall of the binding 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 sealing ring 2 and the upper wall 303b of the lower cover 3 b.
Further, a sealing body seal ring P for sealing a gap between the upper lid 3a and the lower lid 3b is provided in the annular groove.
More preferably, the outer edge 42 of the insulating ring extends into the bent wall 22b of the sealing ring 2 and the upper surface of the brim 32 of the cap assembly 3 by a distance greater than half of the upper wall 303b, so that the insulating ring 4 is more firmly coupled 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 rim 303 of the cap assembly 3 are transited by the arc segment d, and as shown in fig. 2, the insulating ring 4 includes a ring-shaped plane e and a curved surface f formed by bending downward from the outer edge of the ring-shaped plane, and the curved surface f is matched with the arc segment d of the rim 303. This improves the firmness of the connection of the insulating ring 4.
Of course, as shown in fig. 4 and 5, the insulating ring 4 may have only the annular flat surface e in the initial state, and the insulating ring 4 is pressed to form the curved surface f when the vertical wall of the sealing ring is forced to bend by the later steel shell crimping.
As shown in fig. 6, the insulating ring 4 is preferably preformed in a shape of an annular flat surface e and a curved surface f, so that when the peripheral sidewall 22a of the sealing ring 2 is bent and 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 annularly grooved, the 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 mouth shape, so that the small-diameter part of the sealing ring 2 smoothly enters the interior of the steel shell 1 to play a guiding role; along with the increase of the insertion depth of the sealing ring 2, the compression amount of the sealing ring 2 and the steel shell 1 is gradually increased. After the sealing is finished, the sealing area of the battery is radially compressed through a sealing shaping device, and the upper end of the steel shell 1 is shaped to the diameter the same as that of the lower end cylinder of the steel shell 1, so that the battery is manufactured. Such an operation makes it possible to increase the amount of compression of the seal ring 2 and the steel shell 1 with minimal mechanical damage.
The method for manufacturing a cylindrical lithium battery provided by the present invention is described in detail above, and the principle and the implementation of the present invention are explained in the present document by using specific examples, and the description of the above examples is only used to help understanding the present invention and the core idea. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (10)
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 component with an opening at one side; the sealing ring comprises an annular bottom wall and a vertical wall extending upwards from the outer edge of the bottom wall in the vertical direction; the cap assembly comprises a cap top part with a convex middle part and a brim part at the periphery of the cap top part; 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 into a groove formed by the bottom wall and the vertical wall of the sealing ring in a downward direction of the brim part with the top of the cap facing upward;
penetrating an insulating ring through the top of the cap assembly and resting above the brim of the cap assembly;
and bending the opening end of the steel shell inwards to form a curled edge, and forcing the upper end part of the vertical wall of the sealing ring to bend in the same direction to press and hold a part of the outer ring of the insulating ring.
2. The method of claim 1, wherein the vertical wall of the sealing ring is bent to form a bending wall with an inward bending upper end of a peripheral side wall and a peripheral side wall, the bottom wall supports the cap assembly, the peripheral side wall is tightly attached to the side wall of the cylindrical member, the bending wall is tightly attached to the lower side of the bead, the inner edge of the insulating ring contacts with the outer peripheral surface of the top of the cap, the outer edge of the insulating ring extends into the space between the bending wall and the upper surface of the cap edge, and the bending wall is pressed by the insulating ring and the bead to achieve sealing.
3. The method as claimed in claim 1, wherein the side wall of the steel shell is formed with an annular positioning portion protruding from the outside to the inside by annular notching, and the bottom wall of the sealing ring is pressed between the brim portion and the annular positioning portion.
4. The method of claim 1, wherein the cap assembly comprises an upper cap and a lower cap which are vertically engaged, the lower cap comprises a covering edge covering the outer edge of the upper cap, the covering edge comprises a peripheral wall and an upper wall bent inward at the upper end of the peripheral wall, and the peripheral wall and the upper wall of the covering edge are transited by a circular arc section.
5. A method for manufacturing a cylindrical lithium battery as claimed in claim 4, wherein the outer edge of the insulating ring is bent and deformed downward when the steel shell is curled to force the vertical wall of the sealing ring to bend and press the insulating ring, the insulating ring forms a circular plane and a curved surface bent downward from the outer edge of the circular plane, and the curved surface is matched with the circular arc section of the edge covering.
6. The method as claimed in 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 cap top, and the insulating ring is sleeved on the cap top in an interference manner.
7. The method as claimed in claim 2, wherein the outer edge of the insulating ring is horizontally protruded from the edge of the curled edge of the steel can.
8. The method as claimed in claim 2, wherein the distance between the bent wall and the upper surface of the cap portion is greater than one-half of the upper wall.
9. The method of claim 1, wherein the opening of the steel shell is formed in a trumpet shape having a larger top and a smaller bottom after the ring-shaped groove is cut, and the diameter of the lower end of the vertical wall of the sealing ring is smaller than that of the upper end.
10. The method of claim 9, wherein the upper end of the steel can is shaped to the same diameter as the lower end of the steel can by radially compressing the sealed region of the battery with a seal shaping device after the steel can is crimped.
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Cited By (1)
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| CN115051085A (en) * | 2022-06-30 | 2022-09-13 | 东莞新能安科技有限公司 | Battery, manufacturing method thereof, battery module and electric equipment |
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| CN113328213B (en) | 2023-07-11 |
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