CN114551975A - Improved lithium battery end part structure and manufacturing method - Google Patents
Improved lithium battery end part structure and manufacturing method Download PDFInfo
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- CN114551975A CN114551975A CN202210281416.XA CN202210281416A CN114551975A CN 114551975 A CN114551975 A CN 114551975A CN 202210281416 A CN202210281416 A CN 202210281416A CN 114551975 A CN114551975 A CN 114551975A
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- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 34
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 31
- 238000004519 manufacturing process Methods 0.000 title abstract description 23
- 238000007789 sealing Methods 0.000 claims abstract description 177
- 238000003825 pressing Methods 0.000 claims abstract description 33
- 238000003466 welding Methods 0.000 claims description 63
- 238000005452 bending Methods 0.000 claims description 13
- 238000009434 installation Methods 0.000 claims description 7
- 239000003792 electrolyte Substances 0.000 claims description 6
- 238000005096 rolling process Methods 0.000 claims description 5
- 238000010276 construction Methods 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 4
- 150000002641 lithium Chemical class 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000002955 isolation Methods 0.000 abstract 3
- 230000007547 defect Effects 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 238000009413 insulation Methods 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
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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
- H01M10/052—Li-accumulators
-
- 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
- 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
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
-
- 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)
- Secondary Cells (AREA)
Abstract
The invention discloses an improved lithium battery end structure and a manufacturing method thereof, the structure comprises a shell, an electric core, a current collecting piece, a current collecting column, a sealing ring, a bottom cover and the like, and a sleeved isolation cover is mainly added at the top of the current collecting column, and the periphery of the isolation cover is provided with an upper folded edge which is bent upwards along the circumference; and meanwhile, a lower folded edge with a downward bent circumference is arranged on the periphery of the outer cover, the lower folded edge is assembled in the upper folded edge, and a pressing ring is arranged in the upper folded edge to be hermetically assembled between the lower folded edge and the outer circumference of the flow collecting column. Obviously, the design of above-mentioned lithium cell tip structure is simpler, convenient, especially adopts the enclosing cover of the isolation lid of upper hem design and the enclosing cover of lower hem design, and the excellent of product performance can be compromise more simultaneously to this kind of unique design of upper and lower hem, and its cooperation corresponding manufacturing approach, the better automated processing who satisfies production facility makes the needs.
Description
Technical Field
The invention relates to the manufacture of a lithium battery, in particular to an improved end part structure of the lithium battery and a manufacturing method thereof.
Background
At present, the end part of a shell is required to be sealed to form a positive electrode end or a negative electrode end of a lithium battery in the manufacture of cylindrical lithium batteries, and the end part structures are very important for the design and production process of the lithium battery, not only meet the use requirement of the performance of the lithium battery, but also meet the technological requirement and realize the requirement of automation of production equipment; although many of the end structures of lithium batteries of the prior designs have been able to have better structural characteristics, with the increasing application occasions and the expanding market demands of lithium batteries, manufacturers of lithium batteries are also continuously additionally researched and developed to be able to provide more lithium batteries with different end structures, thereby taking into account the advantages of product use performance and meeting the requirements of automatic processing and manufacturing of production equipment.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a lithium battery end part structure and a manufacturing method which can simultaneously give consideration to the excellent use performance of products and meet the automatic processing and manufacturing requirements of production equipment.
The technical problem of the invention is realized by the following technical scheme:
an improved end part structure of a lithium battery comprises a shell, a battery cell in the shell, and a current collecting piece which is arranged at the end part of the shell and seals the battery cell; a bottom cover is arranged outside the current collecting piece, a sealing cover is arranged between the current collecting piece and the bottom cover, a current collecting column is arranged on the current collecting piece, and the battery cell, the current collecting piece and the current collecting column form electric conduction; the flow collecting column is internally provided with a welding hole and a sealing plug filled in the welding hole, the top of the flow collecting column sequentially penetrates through the sealing cover and the bottom cover to be provided with an outer cover, the outer cover and the flow collecting column form electric conduction, the sealing plug is hermetically covered in the welding hole, the top of the flow collecting column is sleeved with an insulating cover, and the periphery of the insulating cover is provided with an upper folded edge which is bent upwards in the circumferential direction; the periphery of the outer cover is provided with a lower folding edge which is bent downwards in the circumference and is assembled in the upper folding edge; and a pressing ring which is hermetically assembled between the lower folded edge and the outer circumference of the flow collecting column is arranged in the upper folded edge.
The bottom of the flow collecting column is provided with a retaining ring which is sleeved and fixed, the retaining ring is assembled between the flow collecting piece and the sealing cover, and the middle part of the flow collecting column is provided with an outer shoulder for abutting against the retaining ring.
The outer circumference of the current collecting piece is provided with a flanging which is turned upwards in the circumferential direction, an insulating ring is arranged between the flanging and the shell, and an edge covering which is used for wrapping the flanging in the circumferential direction is arranged on the insulating ring.
The sealing cover is provided with a sealing hole for the top of the current collecting column to pass through, the bottom cover is provided with a cover hole for the top of the current collecting column to pass through, the inner circumference of the sealing hole is provided with a sealing edge extending upwards in the circumferential direction, the sealing edge penetrates through the cover hole to be in sealing contact with the insulating cover, the bottom cover and the current collecting column are sealed, or the sealing edge penetrates through the cover hole and the insulating cover in sequence and then is in sealing contact with the pressing ring, and the bottom cover, the insulating cover and the current collecting column are sealed.
The sealing plug is arranged in the welding hole through the sealing plug of the sealing ring at the outer circumference.
The sealing plug is a solid cylindrical block or a hollow cylindrical block with an H-shaped cross section.
The current collecting piece is provided with a current collecting hole, the bottom of the current collecting column is provided with a bottom hole respectively communicated with the current collecting hole and the welding hole, and the outer cover is provided with a top hole.
An explosion-proof valve is arranged in the sealing plug.
The bottom cover is matched and assembled in the end part of the shell, the outer circumference of the bottom cover is pressed by the turned edge of the end part of the shell to form connection, or the bottom cover is directly formed by connecting and circumferentially bending the end part of the shell.
A manufacturing method of an improved lithium battery end structure comprises the following steps:
step one, will constitute shell, electric core, current collector piece, insulating ring, current collection post, retaining ring, sealed lid, bottom, insulating cover, enclosing cover, sealing plug and the clamping ring of lithium cell and make reserve, wherein shell and bottom adopt two kinds of structural style: the first is that a bottom cover is matched and assembled in the end part of the shell, the outer circumference of the bottom cover is pressed by a curled edge at the end part of the shell to form connection; the second is that the bottom cover is directly formed by connecting and circumferentially bending the end parts of the shell;
step two, if the shell and the bottom cover adopt the first structural mode, then
Firstly, a battery core is arranged in a shell, a current collecting piece is arranged at the end part of the shell in a sealing way through an insulating ring, the current collecting piece and a pole lug of the battery core are welded and fixed through welding, and the insulating ring is pressed inwards to deform and fix through a rolling groove on the outer circumference of the shell;
the bottom cover and the sealing cover are assembled into a whole, namely the bottom cover is embedded in an embedded groove formed by folding the outer circumference of the sealing cover, and a sealing edge at the central sealing hole of the sealing cover is also plugged into the cover hole of the bottom cover;
mounting the flow collecting column on the flow collecting plate, welding and fixing the flow collecting column and the retainer ring into a whole in advance, mounting the bottom cover and the sealing cover which are assembled into a whole on the flow collecting plate, sequentially enabling the top of the flow collecting column to penetrate through the sealing hole of the sealing cover and the cover hole of the bottom cover, and enabling the retainer ring to be just assembled in the mounting space formed by bending the sealing cover;
the outer circumferences of the bottom cover and the sealing cover are tightly pressed by the curled edge at the end part of the shell to form connection, and the sealing edge plugged into the cover hole just seals the space between the bottom cover and the flow collecting column;
sequentially penetrating the top of the flow collecting column of the sealing cover and the bottom cover to be sleeved with an insulating cover and a pressing ring, enabling the sealing edge plugged into the cover hole to be in sealing contact with the insulating cover, and welding the pressing ring and the flow collecting column;
welding and fixing the flow collecting column and the flow collecting sheet through the welding hole of the flow collecting column, injecting electrolyte into the shell through the bottom hole at the bottom of the flow collecting column and the flow collecting hole on the flow collecting sheet, sealing and installing a sealing plug with an explosion-proof valve into the welding hole of the flow collecting column, and welding the sealing plug and the flow collecting column;
the top of the flow collecting column is provided with an outer cover which is fixed by welding, the outer cover is used for sealing and covering the sealing plug in the welding hole, the lower folded edge of the outer cover is assembled in the upper folded edge of the insulating cover, and the pressing ring is extruded to seal the lower folded edge of the outer cover and the outer circumference of the flow collecting column;
if the shell and the bottom cover adopt the second structure mode, then
Firstly, assembling a current collecting piece and an insulating ring into a whole, then installing the current collecting piece and an electrode lug of an electric core, and welding and fixing the current collecting piece and the electrode lug of the electric core;
secondly, the sealing ring is arranged in the shell with the bottom cover, and the sealing edge at the central sealing hole of the sealing ring is plugged into the cover hole of the bottom cover;
welding and fixing the flow collecting column and the retainer ring into a whole in advance, sequentially penetrating the top of the flow collecting column through a sealing hole of the sealing cover and a cover hole of the bottom cover, and just assembling the retainer ring in an installation space formed by bending the sealing cover;
fourthly, an insulating cover and a pressing ring are sleeved on the top of the flow collecting column which sequentially penetrates through the sealing cover and the bottom cover, the sealing edge plugged into the cover hole penetrates through the cover hole and then penetrates through the insulating cover to be in sealing contact with the pressing ring, so that the bottom cover and the insulating cover are sealed with the flow collecting column, and the pressing ring is welded with the flow collecting column;
inserting the current collecting piece, the insulating ring and the battery cell which are assembled into a whole into the shell;
welding and fixing the flow collecting column and the flow collecting sheet through the welding hole of the flow collecting column, injecting electrolyte into the shell through the bottom hole at the bottom of the flow collecting column and the flow collecting hole on the flow collecting sheet, sealing and installing a sealing plug with an explosion-proof valve into the welding hole of the flow collecting column, and welding the sealing plug and the flow collecting column;
the top of the flow collecting column is provided with an outer cover which is fixed by welding, the outer cover is used for sealing and covering the sealing plug in the welding hole, the lower folded edge of the outer cover is assembled in the upper folded edge of the insulating cover, and the pressing ring is extruded to seal the lower folded edge of the outer cover and the outer circumference of the flow collecting column.
Compared with the prior art, the invention is mainly characterized in that the top of the current collecting column is additionally provided with a sleeved insulating cover, and the periphery of the insulating cover is provided with an upper folded edge which is bent upwards along the circumference; and meanwhile, a lower folded edge with a downward bent circumference is arranged on the periphery of the outer cover, the lower folded edge is assembled in the upper folded edge, and a pressing ring is arranged in the upper folded edge to be hermetically assembled between the lower folded edge and the outer circumference of the flow collecting column. Obviously, the design of the end part structure of the lithium battery is simpler and more convenient, and the advantages of the use performance of the product and the requirements of automatic processing and manufacturing of production equipment can be simultaneously considered.
Drawings
Fig. 1 is a schematic cross-sectional view of a first end structure of the present invention.
Fig. 2 is a perspective view of fig. 1.
Fig. 3 is a schematic cross-sectional view of a second end structure of the present invention.
Fig. 4 is a schematic sectional view of the collector column and the retainer ring.
Fig. 5 is a schematic sectional view of the outer cap.
Fig. 6 is a schematic sectional view of the insulating cover.
FIG. 7 is a schematic cross-sectional view of an end construction suitable for a one-piece bottom cover.
Fig. 8 is a first closure configuration of the collector plate at the end of the housing.
Fig. 9 is a second closure configuration of the collector plate at the end of the housing.
Fig. 10 is a cross-sectional view of the first seal structure of fig. 1 and 3.
Fig. 11 is a cross-sectional view of the second seal configuration of fig. 7.
Fig. 12 is a schematic structural view of the bottom cover in fig. 1.
Fig. 13 is a schematic structural view of the sealing cap of fig. 1.
Detailed Description
The embodiments of the present invention will be described in detail below with reference to the above drawings.
As shown in the figures 1-13, 1 is a shell, 11 is a turned edge, 12 is a rolling groove, 13 is an insulating ring, 131 is a covered edge, 2 is an electric core, 3 is a current collecting piece, 31 is a current collecting hole, 32 is a turned edge, 4 is a bottom cover, 41 is a cover hole, 5 is a sealing cover, 51 is a sealing hole, 511 is a sealing edge, 52 is a caulking groove, 6 is a current collecting column, 61 is a welding hole, 62 is a bottom hole, 63 is an outer shoulder, 7 is an insulating cover, 71 is an upper folded edge, 8 is an outer cover, 81 is a lower folded edge, 82 is a top hole, 9 is a sealing plug, 91 is a sealing ring, 92 is a retainer ring, 93 is an explosion-proof valve, 10 is a pressing ring.
An improved end structure of a lithium battery and a manufacturing method thereof are shown in fig. 1 and fig. 3, and mainly relate to manufacturing of a cylindrical lithium battery end seal, which comprises a cylindrical shell 1 made of metal, a battery cell 2 arranged in the shell, and a current collecting sheet 3 arranged at the end of the shell and used for sealing the battery cell 2.
The closed structure of the current collecting piece 3 at the end of the outer shell 1 is shown in fig. 8 and 9, and mainly means that the outer circumference of the current collecting piece 3 is provided with a flange 32 which is turned over upwards in the circumferential direction, an insulating ring 13 is arranged between the flange and the outer shell 1, and an edge 131 which is shown in fig. 1, 3 or 7 and circumferentially wraps the flange 32 is arranged on the insulating ring, so that the structural compactness and the insulation property between the two are ensured.
The current collecting piece 3 is externally provided with a bottom cover 4, a sealing cover 5 is arranged between the current collecting piece 3 and the bottom cover 4 for spacing, namely, as shown in fig. 1, the sealing cover 5 and the bottom cover 4 are sequentially arranged on the current collecting piece 3, the bottom cover 4 is just embedded in an embedded groove 52 formed by folding and folding the outer circumference of the sealing cover 5, the current collecting column 6 is also arranged on the current collecting piece 3, and the electric core 2, the current collecting piece 3 and the current collecting column 6 are electrically conductive to lead out current.
The flow collecting column 6 is internally provided with a welding hole 64 and a sealing plug 9 plugged in the welding hole 64, specifically, the sealing plug is plugged in the welding hole 61 through a sealing ring 94 on the outer circumference, the top of the flow collecting column 6 sequentially penetrates through the sealing cover 5 and the bottom cover 4 and then is provided with the outer cover 8, the outer cover and the flow collecting column 6 form electric conduction, and the sealing plug 9 is hermetically covered in the welding hole 61.
Meanwhile, the top of the current collecting column 6 is sleeved with an insulating cover 7, actually, the outer cover 8 is installed after the top of the current collecting column 6 sequentially passes through the sealing cover 5, the bottom cover 4 and the insulating cover 7, and the periphery of the insulating cover 7 is provided with an upper folding edge 71 which is bent upwards in the circumferential direction as shown in fig. 6, that is to say, the insulating cover 7 is combined with the upper folding edge 71 to form a cover-shaped part which is opened upwards; and the periphery of the outer cover 8 is provided with a lower folding edge 81 which is downwards bent in the circumference as shown in fig. 5, namely the outer cover 8 and the lower folding edge 81 just form a cover-shaped component which is downwards opened, the lower folding edge 81 is completely assembled in the upper folding edge 71, and then the upper folding edge is also provided with a pressing ring 10 which is hermetically assembled between the lower folding edge 81 and the outer circumference of the collecting column 6.
At this time, the lower folded edge 81 bent downward at the periphery of the outer cap 8 can be separated from the bottom cap 4 by the insulating cap 7 to prevent contact short circuit, and can be in sealing fit with the outer periphery of the current collecting post 6 by the pressing ring 10.
The sealing cover 5 is provided with a sealing hole 51 for the top of the collecting column 6 to pass through, the bottom cover 4 is provided with a cover hole 41 for the top of the collecting column 6 to pass through, the inner circumference of the sealing hole 51 is provided with a sealing edge 511 extending upwards in the circumferential direction, the sealing edge has two sealing structures, the first sealing edge is tightly pressed and contacted on the insulating cover 7 after passing through the cover hole 41 as shown in figure 10, so that the bottom cover 4 and the collecting column 6 are sealed, the second sealing edge is tightly pressed and contacted on the pressing ring 10 after passing through the cover hole 41 and passing through the insulating cover 7 as shown in figure 11, so that the bottom cover 4 and the insulating cover 7 are sealed and contacted with the collecting column 6, and the sealing edge 511 passing through the cover hole 41 is slightly wrapped outwards and reversely around the bottom cover 4, thereby improving the sealing performance and the compactness of the structure.
The bottom of the collecting column 6 is sleeved with a retaining ring 92 shown in fig. 4, the retaining ring and the collecting column 6 are made of the same material, the middle part of the collecting column 6 is provided with an outer shoulder 63 which is propped against the retaining ring 92, and the outer shoulder and the retaining ring 92 are welded and fixed into a whole; meanwhile, the retainer ring 92 is arranged between the collector plate 3 and the sealing cover 5 and is actually embedded in an installation space formed by bending the sealing cover 5.
The split weld-fastened collector post 6 and retainer ring 92 are designed for two primary purposes: firstly, the split type flow collecting column 6 and the check ring 92 are convenient to process, namely the two parts are independently processed and then sleeved and welded into a whole, so that the split type flow collecting column is simpler and more convenient; secondly, the contact area between the current collecting column 6 and the current collecting piece 3 is increased through the retaining ring 92, and other components such as the sealing cover 5, the bottom cover 4, the insulating cover 7 and the like can be pressed on the retaining ring 92, so that the compactness and the stability of the installation structure of the current collecting column 6 are ensured, and the current collecting column 6 is prevented from being flushed by the internal pressure of the shell 1.
The sealing plug 9 is a solid cylindrical block as shown in fig. 1 and fig. 2 or a hollow cylindrical block with an H-shaped cross section as shown in fig. 3, if the hollow cylindrical block with the H-shaped cross section is adopted, a collecting hole 31 needs to be arranged on the collecting sheet 3, a bottom hole 62 which is respectively communicated with the collecting hole 31 and the welding hole 61 as shown in fig. 4 needs to be arranged at the bottom of the collecting column 6, and a top hole 82 needs to be arranged on the outer cover 8. In addition, an explosion-proof valve 93 facing the bottom hole 62 is required to be arranged in the sealing plug 9, particularly in the middle of the H-shaped structure, so as to play a role of safety protection. If the sealing plug 9 is a solid cylindrical block, the top hole 82 does not need to be formed in the outer cover 8.
In addition, the end structure of the invention can be applied to two types of bottom cover 4 structures, one of which is a split type bottom cover structure as shown in fig. 1-3, i.e. the bottom cover 4 as a single part is matched and assembled in the end of the shell 1, the outer circumference of the bottom cover 4 is pressed by the turned edge 11 of the end of the shell 1 to form connection, the outer circumference of the shell 1 is also provided with a rolling groove 12 to press the outer circumference of the current collecting piece 3, i.e. press and fix the insulating ring 13; another one is a one-piece bottom cover structure as shown in fig. 7, that is, the bottom cover 4 is directly formed by bending the end of the housing 1 one-piece circumferentially.
Obviously, the design of the end part structure of the lithium battery is simpler and more convenient, and particularly, the insulating cover 7 designed by the upper folding edge 71 and the outer cover 8 designed by the lower folding edge 81 are adopted, so that the unique design of the upper folding edge and the lower folding edge can give consideration to the advantages of the use performance of the product and meet the requirements of automatic processing and manufacturing of production equipment.
The manufacturing method of the improved lithium battery end part structure mainly comprises the following steps:
step one, a shell 1, an electric core 2, a current collecting piece 3, an insulating ring 13, a current collecting column 6, a check ring 92, a sealing cover 5, a bottom cover 4, an insulating cover 7, an outer cover 8, a sealing plug 9 and a pressing ring 10 which form the lithium battery are manufactured for standby, wherein the shell 1 and the bottom cover 4 adopt two structure modes: the first is that the bottom cover 4 is matched and assembled in the end part of the shell 1, the outer circumference of the bottom cover 4 is pressed by the turned edge 11 of the end part of the shell 1 to form connection; the second is that the bottom cover 4 is directly formed by connecting and circumferentially bending the end part of the shell 1;
step two, if the shell 1 and the bottom cover 4 adopt the first structural mode, then
Firstly, an electric core 2 is arranged in a shell 1, a current collecting piece 3 is arranged at the end part of the shell 1 in a sealing way through an insulating ring 13, the current collecting piece 3 and a pole lug of the electric core 2 are fixed in a welding way through welding, and the insulating ring 13 is fixed by inward pressing deformation of a rolling groove 12 on the outer circumference of the shell 1;
secondly, the bottom cover 4 and the sealing cover 5 are assembled into a whole, namely the bottom cover 4 is embedded in an embedded groove 52 formed by folding the outer circumference of the sealing cover 5, and a sealing edge 511 at the central sealing hole 51 of the sealing cover 5 also needs to be plugged into the cover hole 41 of the bottom cover 4;
thirdly, the flow collecting column 6 is arranged on the flow collecting piece 3, the flow collecting column 6 and the check ring 92 need to be welded and fixed into a whole in advance, the bottom cover 4 and the sealing cover 5 which are assembled into a whole are arranged on the flow collecting piece 3, the top of the flow collecting column 6 sequentially penetrates through the sealing hole 51 of the sealing cover 5 and the cover hole 41 of the bottom cover 4, and meanwhile, the check ring 92 is just assembled in an installation space formed by bending the sealing cover 5;
the outer circumferences of the bottom cover 4 and the sealing cover 5 are pressed by the curled edge 11 at the end part of the shell 1 to form connection, and the sealing edge 511 inserted into the cover hole 41 just seals the space between the bottom cover 4 and the flow collecting column 6;
fifthly, the insulating cover 7 and the pressing ring 10 are sleeved on the top of the flow collecting column 6 which sequentially passes through the sealing cover 5 and the bottom cover 4, the sealing edge 511 which is plugged into the cover hole 41 is in sealing contact with the insulating cover 7, and the pressing ring 10 is welded with the flow collecting column 6;
welding and fixing the current collecting column 6 and the current collecting sheet 3 through the welding hole 61 of the current collecting column 6, injecting electrolyte into the shell 1 through the bottom hole 62 at the bottom of the current collecting column 6 and the current collecting hole 31 on the current collecting sheet 3, sealing and installing the sealing plug 9 with the explosion-proof valve 93 into the welding hole 61 of the current collecting column 6, and welding the sealing plug 9 and the current collecting column 6;
the top of the collecting column 6 is provided with an outer cover 8 fixed by welding, a sealing plug 9 is sealed and covered in the welding hole 61 by the outer cover, a lower folding edge 81 of the outer cover 8 is assembled in an upper folding edge 71 of the insulating cover 7, and a pressing ring 10 is extruded to seal the lower folding edge 81 of the outer cover 8 and the outer circumference of the collecting column 6;
if the second structure is adopted for the outer shell 1 and the bottom cover 4, then
Firstly, assembling the current collecting piece 3 and the insulating ring 13 into a whole, then installing the current collecting piece 3 and the electrode lug of the electric core 2 on the electric core 2, and welding and fixing the current collecting piece 3 and the electrode lug of the electric core 2;
secondly, the sealing ring 5 is arranged in the shell 1 with the bottom cover 4, and the sealing edge 511 at the central sealing hole 51 of the sealing ring 5 is plugged into the cover hole 41 of the bottom cover 4;
thirdly, the flow collecting column 6 and the check ring 92 are welded and fixed into a whole in advance, the top of the flow collecting column 6 sequentially penetrates through the sealing hole 51 of the sealing cover 5 and the cover hole 41 of the bottom cover 4, and meanwhile, the check ring 92 is just assembled in an installation space formed by bending the sealing cover 5;
fourthly, the insulating cover 7 and the pressing ring 10 are sleeved on the top of the current collecting column 6 which sequentially penetrates through the sealing cover 5 and the bottom cover 4, the sealing edge 511 which is plugged into the cover hole 41 penetrates through the cover hole 41 and then penetrates through the insulating cover 7 to be in sealing contact with the pressing ring 10, so that the bottom cover 4 and the insulating cover 7 are sealed with the current collecting column 6, and the pressing ring 10 is welded with the current collecting column 6;
the current collecting piece 3, the insulating ring 13 and the battery cell 2 which are assembled into a whole are plugged into the shell 1;
welding and fixing the current collecting column 6 and the current collecting sheet 3 through the welding hole 61 of the current collecting column 6, injecting electrolyte into the shell 1 through the bottom hole 62 at the bottom of the current collecting column 6 and the current collecting hole 31 on the current collecting sheet 3, sealing and installing the sealing plug 9 with the explosion-proof valve 93 into the welding hole 61 of the current collecting column 6, and welding the sealing plug 9 and the current collecting column 6;
the top of the collecting column 6 is provided with an outer cover 8 fixed by welding, a sealing plug 9 is sealed and covered in the welding hole 61 by the outer cover, a lower folding edge 81 of the outer cover 8 is assembled in an upper folding edge 71 of the insulating cover 7, and a pressing ring 10 is extruded to seal the lower folding edge 81 of the outer cover 8 and the outer circumference of the collecting column 6.
The above description is only a specific embodiment of the present invention, and those skilled in the art should understand that any similar structural design to the embodiment is included in the protection scope of the present invention.
Claims (10)
1. An improved end part structure of a lithium battery comprises a shell (1), a battery cell (2) in the shell, and a current collecting sheet (3) which is arranged at the end part of the shell and seals the battery cell (2); a bottom cover (4) is arranged outside the current collecting piece, a sealing cover (5) is arranged between the current collecting piece (3) and the bottom cover (4), a current collecting column (6) is arranged on the current collecting piece (3), and the battery cell (2), the current collecting piece (3) and the current collecting column (6) form electric conduction; the flow collecting column (6) is internally provided with a welding hole (61) and a sealing plug (9) plugged in the welding hole (61), the top of the flow collecting column (6) sequentially penetrates through a sealing cover (5) and a bottom cover (4) and then is provided with an outer cover (8), the outer cover and the flow collecting column (6) form electric conduction, and the sealing plug (9) is hermetically covered in the welding hole (61), the flow collecting column is characterized in that the top of the flow collecting column (6) is sleeved with an insulating cover (7), and the periphery of the insulating cover is provided with an upper folding edge (71) which is bent upwards in the circumferential direction; the periphery of the outer cover (8) is provided with a lower folded edge (81) which is bent downwards in the circumference and assembled in the upper folded edge (71); and a pressing ring (10) which is hermetically assembled between the lower folded edge (81) and the outer circumference of the flow collecting column (6) is arranged in the upper folded edge (71).
2. An improved lithium battery end structure according to claim 1, characterized in that the bottom of the current collecting column (6) is provided with a fixed retaining ring (92) which is arranged between the current collecting piece (3) and the sealing cover (5), and the middle of the current collecting column (6) is provided with an outer shoulder (63) which is pressed against the retaining ring (92).
3. An improved end structure of lithium battery as claimed in claim 1, characterized in that the current collector (3) is provided with a flange (32) which is turned upwards along the circumference at the outer circumference, an insulating ring (13) is provided between the flange and the housing (1), and the insulating ring is provided with a covered edge (131) which covers the flange (32) along the circumference.
4. An improved lithium battery end structure according to claim 1, wherein said sealing cover (5) is provided with a sealing hole (51) for allowing the top of said current collecting post (6) to pass through, said bottom cover (4) is provided with a cover hole (41) for allowing the top of said current collecting post (6) to pass through, the inner circumference of said sealing hole (51) is provided with a sealing edge (511) extending circumferentially upward, said sealing edge passes through the cover hole (41) to be in sealing contact with the insulating cover (7) and form a seal between said bottom cover (4) and the current collecting post (6), or said sealing edge (511) passes through the cover hole (41) and the insulating cover (7) in sequence to be in sealing contact with the pressing ring (10), and form a seal between said bottom cover (4), the insulating cover (7) and the current collecting post (6).
5. An improved lithium battery end construction according to claim 1, characterized in that the sealing plug (9) is fitted into the weld hole (61) via an outer circumferential sealing ring (91).
6. An improved lithium battery end construction according to claim 1, characterized in that the sealing plug (9) is a solid cylindrical piece or a hollow cylindrical piece with an H-shaped cross-section.
7. An improved end structure of lithium battery as defined in claim 6, wherein said current collecting plate (3) is provided with current collecting holes (31), the bottom of current collecting post (6) is provided with bottom holes (62) respectively communicating current collecting holes (31) and welding holes (61), and the outer cover (8) is provided with top holes (82).
8. An improved lithium battery end construction according to claim 1, characterized in that the sealing plug (9) is provided with an explosion-proof valve (93).
9. An improved end structure of lithium battery as claimed in claim 1, characterized in that the bottom cover (4) fits inside the end of the housing (1) in a fitting manner, the outer circumference of the bottom cover (4) is pressed by the turned edge (11) of the end of the housing (1) to form a connection, or the bottom cover (4) is directly formed by bending the end of the housing (1) integrally and circumferentially.
10. The method of claim 1, wherein the method comprises the steps of:
step one, to constitute shell (1), electric core (2), current collection piece (3), insulating ring (13), mass flow post (6), retaining ring (92), sealed lid (5), bottom (4), insulating cover (7), enclosing cover (8), sealing plug (9) and clamping ring (10) of lithium cell and make good reserve, wherein shell (1) and bottom (4) adopt two kinds of structural style: the first is that a bottom cover (4) is matched and assembled in the end part of the shell (1), the outer circumference of the bottom cover (4) is pressed by a curled edge (11) at the end part of the shell (1) to form connection; the second type is that the bottom cover (4) is directly formed by connecting and circumferentially bending the end part of the shell (1);
step two, if the shell (1) and the bottom cover (4) adopt the first structural mode, then
Firstly, an electric core (2) is arranged in a shell (1), a current collecting piece (3) is arranged at the end part of the shell (1) in a sealing way through an insulating ring (13), the current collecting piece (3) and a pole lug of the electric core (2) are welded and fixed through welding, and the insulating ring (13) is pressed inwards, deformed and fixed through a rolling groove (12) on the outer circumference of the shell (1);
secondly, the bottom cover (4) and the sealing cover (5) are assembled into a whole, namely the bottom cover (4) is embedded in an embedding groove (52) formed by folding the outer circumference of the sealing cover (5), and a sealing edge (511) at a central sealing hole (51) of the sealing cover (5) is also plugged into a cover hole (41) of the bottom cover (4);
thirdly, the flow collecting column (6) is arranged on the flow collecting piece (3), the flow collecting column (6) and the check ring (92) need to be welded and fixed into a whole in advance, the bottom cover (4) and the sealing cover (5) which are assembled into a whole are arranged on the flow collecting piece (3), the top of the flow collecting column (6) sequentially penetrates through the sealing hole (51) of the sealing cover (5) and the cover hole (41) of the bottom cover (4), and the check ring (92) is just assembled in an installation space formed by bending the sealing cover (5);
the outer circumferences of the bottom cover (4) and the sealing cover (5) are pressed by a curled edge (11) at the end part of the shell (1) to form connection, and the sealing edge (511) plugged into the cover hole (41) just seals the space between the bottom cover (4) and the current collecting column (6);
sequentially penetrating the top of the flow collecting column (6) of the sealing cover (5) and the bottom cover (4) to be sleeved with an insulating cover (7) and a pressing ring (10), enabling a sealing edge (511) filled into the cover hole (41) to be in sealing contact with the insulating cover (7), and welding the pressing ring (10) and the flow collecting column (6);
welding and fixing the current collecting column (6) and the current collecting sheet (3) through a welding hole (61) of the current collecting column (6), injecting electrolyte into the shell (1) through a bottom hole (62) at the bottom of the current collecting column (6) and a current collecting hole (31) on the current collecting sheet (3), sealing a sealing plug (9) with an explosion-proof valve (93) into the welding hole (61) of the current collecting column (6) in a sealing manner, and welding the sealing plug (9) and the current collecting column (6);
the top of the flow collecting column (6) is provided with an outer cover (8) which is fixed by welding, a sealing plug (9) is sealed and covered in the welding hole (61) by the outer cover, a lower folding edge (81) of the outer cover (8) is assembled in an upper folding edge (71) of the insulating cover (7), and a pressing ring (10) is extruded to form sealing between the lower folding edge (81) of the outer cover (8) and the outer circumference of the flow collecting column (6);
if the shell (1) and the bottom cover (4) adopt the second structure mode, then
Firstly, assembling a current collecting piece (3) and an insulating ring (13) into a whole, then installing the current collecting piece and the insulating ring on an electric core (2), and welding and fixing the current collecting piece (3) and a lug of the electric core (2) by welding;
secondly, the sealing ring (5) is arranged in the shell (1) with the bottom cover (4), and a sealing edge (511) at the central sealing hole (51) of the sealing ring (5) is plugged into the cover hole (41) of the bottom cover (4);
thirdly, the flow collecting column (6) and the check ring (92) are welded and fixed into a whole in advance, then the top of the flow collecting column (6) sequentially penetrates through a sealing hole (51) of the sealing cover (5) and a cover hole (41) of the bottom cover (4), and meanwhile, the check ring (92) is just assembled in an installation space formed by bending the sealing cover (5);
fourthly, an insulating cover (7) and a pressing ring (10) are sleeved on the top of the flow collecting column (6) which sequentially penetrates through the sealing cover (5) and the bottom cover (4), a sealing edge (511) which is plugged into the cover hole (41) penetrates through the cover hole (41) and then penetrates through the insulating cover (7) to be in sealing contact with the pressing ring (10), so that the bottom cover (4), the insulating cover (7) and the flow collecting column (6) are sealed, and the pressing ring (10) and the flow collecting column (6) are welded;
the current collecting piece (3), the insulating ring (13) and the battery core (2) which are assembled into a whole are plugged into the shell (1);
welding and fixing the current collecting column (6) and the current collecting sheet (3) through a welding hole (61) of the current collecting column (6), injecting electrolyte into the shell (1) through a bottom hole (62) at the bottom of the current collecting column (6) and a current collecting hole (31) on the current collecting sheet (3), sealing a sealing plug (9) with an explosion-proof valve (93) into the welding hole (61) of the current collecting column (6) in a sealing manner, and welding the sealing plug (9) and the current collecting column (6);
the top of the flow collecting column (6) is provided with an outer cover (8) which is fixed by welding, a sealing plug (9) is sealed and covered in the welding hole (61) by the outer cover, a lower folding edge (81) of the outer cover (8) is assembled in an upper folding edge (71) of the insulating cover (7), and a pressing ring (10) is extruded to seal the lower folding edge (81) of the outer cover (8) and the outer circumference of the flow collecting column (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210281416.XA CN114551975A (en) | 2022-03-22 | 2022-03-22 | Improved lithium battery end part structure and manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210281416.XA CN114551975A (en) | 2022-03-22 | 2022-03-22 | Improved lithium battery end part structure and manufacturing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114551975A true CN114551975A (en) | 2022-05-27 |
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ID=81666496
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210281416.XA Pending CN114551975A (en) | 2022-03-22 | 2022-03-22 | Improved lithium battery end part structure and manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114551975A (en) |
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2022
- 2022-03-22 CN CN202210281416.XA patent/CN114551975A/en active Pending
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