CN116315476A - Battery structure adopting post lugs and manufacturing method thereof - Google Patents
Battery structure adopting post lugs and manufacturing method thereof Download PDFInfo
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- CN116315476A CN116315476A CN202310517098.7A CN202310517098A CN116315476A CN 116315476 A CN116315476 A CN 116315476A CN 202310517098 A CN202310517098 A CN 202310517098A CN 116315476 A CN116315476 A CN 116315476A
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- positive electrode
- current collecting
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- lug
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 29
- 238000003466 welding Methods 0.000 claims abstract description 44
- 238000000034 method Methods 0.000 claims abstract description 8
- 238000003825 pressing Methods 0.000 claims description 22
- 238000009413 insulation Methods 0.000 claims description 21
- 239000007788 liquid Substances 0.000 claims description 20
- 238000002347 injection Methods 0.000 claims description 18
- 239000007924 injection Substances 0.000 claims description 18
- 238000007789 sealing Methods 0.000 claims description 13
- 238000005096 rolling process Methods 0.000 claims description 10
- 239000003792 electrolyte Substances 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000004080 punching Methods 0.000 claims description 3
- 238000012856 packing Methods 0.000 claims description 2
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000009434 installation Methods 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 5
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 239000011324 bead Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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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
- 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
- H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
-
- 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
- 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
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
- H01M50/147—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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery 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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
- H01M50/552—Terminals characterised by their shape
- H01M50/559—Terminals adapted for cells having curved cross-section, e.g. round, elliptic or button cells
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention discloses a battery structure adopting a column lug and a manufacturing method thereof, comprising a shell, a battery core, a positive electrode terminal, a negative electrode terminal and the like, wherein the column lug is mainly arranged between a positive electrode current collecting plate of the positive electrode terminal and a positive electrode combined cover, two ends of the column lug are respectively positioned and fixed on the positive electrode combined cover and the positive electrode current collecting plate, and the two ends of the column lug are positioned on the same axis. Obviously, the invention takes the original post lug as the positive electrode current lead-out, not only can form positioning installation and welding fixation between the positive electrode current collecting piece and the positive electrode combined cover through the post lug, thereby ensuring that the positive electrode current collecting piece and the positive electrode combined cover can be positioned at a centering position after the welding of the post lug, facilitating the current lead-out and improving the use reliability, but also the shape structure of the post lug is beneficial to realizing the automation of the battery production; in addition, the implementation of the welding process is more convenient after the post lugs are adopted, so that the production procedures and equipment investment for welding the lugs are better reduced, and the production cost of battery products is effectively reduced.
Description
Technical Field
The invention relates to a battery structure and a manufacturing method thereof, in particular to a battery structure adopting a column lug and a manufacturing method thereof.
Background
Along with the continuous development of new energy technology, the production technology of various battery structures such as lithium batteries used as power and energy storage is also continuously updated, and particularly, the battery structure applying the full-tab technology has better safety performance and more reliable use quality, so that the market range is continuously expanded; however, the battery structure applying the full tab technology is generally composed of a housing, a battery core in the housing, a positive electrode terminal, a negative electrode terminal and the like, wherein the battery core is respectively arranged at two ends of the housing and is sealed and sealed in the housing, the positive electrode terminal mainly comprises a positive electrode current collecting plate, a positive electrode insulating ring, a positive electrode combined cover and the like which are sequentially arranged at a port of the housing, the positive electrode current collecting plate is welded with the positive electrode tab of the battery core, the positive electrode insulating ring is arranged on the positive electrode current collecting plate, the positive electrode combined cover is arranged at the port, and an extraction tab is additionally arranged between the positive electrode current collecting plate and the positive electrode combined cover so as to extract positive electrode current; however, the lead-out tab in the traditional battery structure is a sheet-shaped tab, and after the sheet-shaped tab is welded and fixed with the positive electrode current collecting sheet and the positive electrode combined cover respectively, the positive electrode current collecting sheet and the positive electrode combined cover are difficult to be guaranteed to be in a centering position, so that the current lead-out and the use reliability of the battery are greatly affected; in addition, because of the special shape relation of the sheet-shaped tab, namely, the sheet-shaped tab is thin and light, more equipment is required to be input in the battery production process in order to adapt to the special shape, so that the tab welding production process is more and more complicated, the production automation is not facilitated, and the cost of a battery product is increased.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the battery structure adopting the post tab and the manufacturing method thereof, which can ensure that the positive electrode current collecting piece and the positive electrode combined cover are positioned at the centering position after the tab welding, and can reduce the production procedure and equipment investment of the tab welding, thereby better realizing the automation of battery production and effectively reducing the production cost of battery products.
The technical problems of the invention are realized by the following technical scheme:
the utility model provides a battery structure of adoption post utmost point ear, includes shell, the electric core in the shell, and set up respectively at the shell both ends, and will electric core seal seals positive end and the negative pole end in the shell, this positive end includes positive current collector piece, positive insulating circle and the positive combination lid of packing into in proper order by the port of shell, and positive current collector piece welds with the positive electrode ear of electric core, be equipped with the annotate liquid hole on positive current collector piece, positive insulating circle sets up on positive current collector piece, positive combination lid sets up in port department, positive current collector piece and positive combination lid between be equipped with the post utmost point ear, this post utmost point ear upper end location is fixed on positive combination lid, post utmost point ear lower extreme location is fixed on positive current collector piece, and the location of post utmost point ear both ends is in same axile.
The positive electrode combined cover consists of a positive electrode current collecting cover and an insulating pressing ring coated on the outer circumference of the positive electrode current collecting cover, and a plurality of pressure release grooves are formed in the positive electrode current collecting cover; the upper end of the post lug is positioned and fixed on the positive electrode current collecting cover.
The positioning and fixing structure of the lower end of the post lug on the positive electrode current collecting plate is characterized in that the positive electrode current collecting plate is provided with a post lug which is formed by upward punching, the lower end of the post lug and the positive electrode current collecting plate form a connected structure, or the lower end of the post lug is positioned and fixed on the positive electrode current collecting plate, or a liquid injection hole is arranged at the axle center of the positive electrode current collecting plate, a positioning pipe which extends upwards along the circumference is arranged at the orifice of the liquid injection hole, and the lower end of the post lug is positioned and installed on the positioning pipe and welded and fixed; the positioning and fixing structure of the upper end of the post lug on the positive electrode current collecting cover is that the upper end of the post lug is positioned and fixed in a positioning groove of the positive electrode current collecting cover, or a positioning post extending downwards along the axial lead is arranged on the bottom surface of the positive electrode current collecting cover, and the upper end of the post lug penetrates through the positive electrode insulating ring to be positioned and mounted on the positioning post and welded and fixed.
The positioning groove is arranged on the bottom surface of the positive current collecting cover, a boss is formed on the top surface of the positive current collecting cover by the positioning groove, the upper end of the post lug is positioned and installed in the positioning groove of the positive current collecting cover, the upper end of the post lug is welded and fixed from the outer side by the boss, or the positioning groove is arranged on the bottom surface of the positive current collecting cover, a top hole penetrating the positive current collecting cover upwards is formed in the bottom surface of the positioning groove, the upper end of the post lug is positioned and installed in the positioning groove of the positive current collecting cover and welded and fixed, and the lower end of the post lug penetrates through the top hole and is welded and fixed with the positive current collecting plate.
The pole lug is a hollow pole lug with non-compressed height, the positive electrode combined cover is arranged in a port of the shell, and is pressed on the outer circumference of the positive electrode current collecting cover by the curled edge of the port against the insulation pressing ring to form insulation sealing fixation; the post tab is a hollow tab with compressed height, when the height of the post tab is not compressed, the positive electrode combined cover is higher than the port of the shell, a welding gap is formed between the positive electrode combined cover and the port of the shell, the upper end of the post tab is positioned and installed on the positioning post and enters from the welding gap to be welded and fixed by laser, and then the height of the post tab is compressed, so that the positive electrode combined cover is installed in the port of the shell, and is pressed on the outer circumference of the positive electrode current collecting cover by the curled edge of the port against the insulation pressing ring to form insulation sealing and fixing.
The pole lugs are hollow straight pipes with compressed height, pipe orifices at two ends of the hollow straight pipes are positioned on the same axis, and the pole lugs are respectively positioned and fixed on the positioning pipes of the liquid injection holes and the positioning posts of the positive electrode current collecting cover through the pipe orifices at two ends; the pole lug is a hollow bracket with compressed height, the upper end face and the lower end face of the hollow bracket are respectively provided with a positioning hole, the positioning holes of the upper end face and the lower end face are positioned on the same axis, and the pole lug is respectively positioned and fixed on a positioning pipe of the liquid injection hole and a positioning column of the positive electrode current collecting cover through the positioning holes of the upper end face and the lower end face.
The outer circumferential surface of the hollow straight pipe is provided with a plurality of notches, the hollow straight pipe is compressed, and the notches are driven to deform so as to reduce the height of the pole lugs; the hollow support is compressed and drives the side of the hollow support to deform so as to reduce the height of the pole lug.
The outer circumferential surface of the shell is provided with a circle of radial circumferential rolling grooves, and a circle of inner convex rings are formed on the inner circumferential surface of the shell by the rolling grooves; the lower edge of the inner convex ring is propped against the outer circumference of the positive electrode insulating ring; the positive electrode combined cover is arranged in the port of the shell, and the outer circumference of the positive electrode current collecting cover is propped against the upper edge of the inner convex ring through the insulating pressing ring to form sealing.
The negative electrode end is an unopened closed end at the bottom of the shell, the negative electrode end comprises a negative electrode current collecting piece, the negative electrode current collecting piece is respectively welded and fixed with a negative electrode lug of the battery cell and the bottom of the shell, the outer circumference of the negative electrode current collecting piece is provided with a negative electrode folded edge which bends circumferentially towards the direction of the battery cell, and the negative electrode folded edge is buckled between the inner circumference surface of the shell and the outer circumference surface of the battery cell.
A battery structure manufacturing method adopting a post tab comprises the following steps:
welding and fixing the plane of the negative electrode current collecting piece with the negative electrode lug of the battery cell, and arranging a negative electrode folded edge which bends circumferentially towards the direction of the battery cell on the outer circumference of the negative electrode current collecting piece;
step two, the battery cell welded with the negative electrode current collecting sheet is arranged in a shell, the bottom of the shell is closed to be used as a negative electrode end, an open port is arranged at the top of the shell to be used as a positive electrode end, one end of the battery cell welded with the negative electrode current collecting sheet is arranged in the shell through the port, and a negative electrode hem is buckled between the inner circumferential surface of the shell and the outer circumferential surface of the battery cell;
step three, loading the positive current collecting plate into the shell from the port, welding and fixing the plane of the positive current collecting plate with the positive lug of the battery cell, arranging a positive folded edge which bends circumferentially back to the direction of the battery cell on the outer circumference of the positive current collecting plate, arranging a liquid injection hole on the positive current collecting plate, and injecting electrolyte into the battery cell through the liquid injection hole;
step four, arranging the positive electrode insulating ring on the positive electrode current collecting plate, rolling a groove on the outer circumferential surface of the shell, forming a circle of inner convex ring on the inner circumferential surface of the shell by the rolling groove, propping the lower edge of the inner convex ring against the outer circumference of the positive electrode insulating ring, and enabling the outer circle Zhou Qian of the positive electrode insulating ring to be between the inner circumferential surface of the shell and the positive electrode folded edge of the positive electrode current collecting plate;
fifthly, welding and fixing the negative electrode current collecting piece with the bottom of the shell;
step six, wrapping the outer circumference of the positive electrode current collecting cover with an insulating pressing ring to form a positive electrode combined cover;
step seven, a post lug is arranged between the positive electrode current collecting piece and the positive electrode combined cover; if the post lug is a hollow lug with non-compressed height, positioning and mounting two ends of the post lug on the positive electrode current collecting sheet and the positive electrode current collecting cover of the positive electrode combined cover respectively, and performing welding fixation, the positive electrode combined cover is arranged in a port of the shell, directly pressed against the insulation pressing ring by a curled edge of the port and pressed on the outer circumference of the positive electrode current collecting cover in a circumferential manner to form insulation sealing fixation; if the pole lug is a hollow pole lug with compressed height, the height of the pole lug is not compressed firstly, so that the positive pole combined cover is higher than the port of the shell, a welding gap is formed between the positive pole combined cover and the port of the shell, then the welding gap enters to perform laser welding fixation between the upper end of the pole lug and the positive pole current collecting cover, then the height of the pole lug is compressed, so that the positive pole combined cover is arranged in the port of the shell, and the pole lug is pressed against the insulation pressing ring by the curled edge of the port and is pressed on the outer circumference of the positive pole current collecting cover in a circumferential manner to form insulation sealing fixation;
and step eight, manufacturing a battery structure by adopting the post lugs.
Compared with the prior art, the invention is mainly characterized in that the column lug is arranged between the positive electrode current collecting plate and the positive electrode combined cover, the upper end of the column lug is positioned and fixed on the positive electrode combined cover, the lower end of the column lug is positioned and fixed on the positive electrode current collecting plate, and the positioning of the two ends of the column lug is positioned on the same axis. Obviously, the invention replaces the sheet-shaped tab in the traditional battery structure with the original tab as the positive current lead-out, not only can form positioning installation and welding fixation between the positive current collecting tab and the positive combined cover through the tab, thereby ensuring that the positive current collecting tab and the positive combined cover can be positioned in a centering position after tab welding, facilitating current lead-out, improving use reliability, but also the shape structure of the tab is beneficial to realizing the automation of battery production; in addition, the implementation of the welding process is more convenient after the post lugs are adopted, so that the production procedures and equipment investment for welding the lugs are better reduced, and the production cost of battery products is effectively reduced.
Drawings
Fig. 1 is a schematic cross-sectional view of the present invention (the cylindrical tab is a cylindrical hollow tab with a non-compressed height).
Fig. 2 is a cross-sectional view of the positive electrode terminal (the cylindrical tab is a cylindrical hollow tab of non-compressed height).
Fig. 3 is a perspective view of fig. 2.
Fig. 4 is a schematic structural view of the positive current collecting cap of fig. 2.
Fig. 5 is a cross-sectional view of the positive electrode terminal (the post tab is an inverted cone-shaped hollow tab of non-compressed height).
Fig. 6 is a perspective view of fig. 5.
Fig. 7 is a schematic structural view of the positive current collecting cap of fig. 5.
Fig. 8 is a schematic cross-sectional structure of the present invention (the post tab is a hollow straight tube of compressed height).
Fig. 9 is a cross-sectional view of the positive end (the post tab is a hollow straight tube of compressed height).
Fig. 10 is a perspective view of fig. 9.
Fig. 11 is a top view of fig. 9.
Fig. 12 is a schematic view of the structure of the column tab in fig. 9 at an uncompressed height.
Fig. 13 is a schematic structural view of the compressed height of the tab of fig. 9.
Fig. 14 is an enlarged view of the post tab of fig. 9 using a hollow straight tube and having an uncompressed height.
Fig. 15 is a cross-sectional view of the positive terminal (the post tab is a hollow bracket of compressed height).
Fig. 16 is a perspective view of fig. 15.
Fig. 17 is a schematic view of the uncompressed height of the pole tab of fig. 15.
Fig. 18 is a schematic structural view of the compressed height of the tab of fig. 15.
Fig. 19 is an enlarged view of the post tab of fig. 15 using a hollow bracket and having an uncompressed height.
Fig. 20 is a schematic structural view of a positive current collector sheet.
Fig. 21 is a schematic structural view of the positive electrode assembly cover.
Fig. 22 is a schematic view of the housing structure at the positive end.
Fig. 23 is a cross-sectional view of the negative end.
Fig. 24 is a perspective view of fig. 23.
Fig. 25 is a reference view of a second version of a post tab employing a hollow straight tube with an uncompressed height.
Fig. 26 is a third version of a reference view of a post tab employing a hollow straight tube and an uncompressed height.
Fig. 27 is a fourth version of the reference diagram with a post tab using a hollow straight tube and an uncompressed height.
Fig. 28 is a fifth version of the reference diagram with a hollow straight tube and uncompressed height for the post tabs.
Fig. 29 is a reference view of a pattern in which the tab is spring-like and uncompressed height.
Description of the embodiments
Embodiments of the present invention will be described in detail below with reference to the drawings.
1-29, 1, shell, 11, bead, 12, roll groove, 13, inner bead, 131, upper edge, 132, lower edge, 14, port, 2, cell, 3, positive end, 31, positive current collector plate, 311, fill hole, 312, positive flange, 313, locating tube, 32, positive insulation ring, 33, positive composite cover, 331, positive current collector cover, 332, insulation press ring, 333, pressure relief groove, 334, locating post, 335, locating groove, 336, boss, 337, top hole, 338, hole plug, 34, post tab, 341, notch, 342, pipe orifice, 343, locating hole, 4, negative end, 41, negative current collector plate, 411.
The battery structure adopting the pole lugs and the manufacturing method thereof are shown in fig. 1, and can be mainly used as power and energy storage in new energy technology application, the battery structure related to the embodiment is mainly described in detail by taking a lithium battery structure as an example, and the battery structure comprises a shell 1, an electric core 2 in the shell, positive electrode ends 3, negative electrode ends 4 and the like which are respectively arranged at two ends of the shell, and the electric core 2 is sealed and sealed in the shell 1.
The casing 1 is usually a steel casing, or may be a casing made of other materials suitable for a battery, and the shape of the casing 1 is various, but in this embodiment, only a cylindrical casing is selected that is most commonly used, and in the example shown in fig. 1, the bottom of the casing 1 is completely closed, that is, the bottom of the casing 1 is an unopened closed end, and is used as the negative electrode terminal 3; the top of the housing 1 has an open port 14 and acts as the positive terminal 3.
The positive electrode terminal 3 includes a positive electrode current collecting plate 31, a positive electrode insulating ring 32 and a positive electrode combination cover 33 which are sequentially installed from the port 14 of the housing 1, and the positive electrode current collecting plate 31, the positive electrode insulating ring 32 and the positive electrode combination cover 33 are also selected to be in a shape of a circular plate, a circular ring and a circular disc in order to be suitable for the cylindrical housing 1.
The positive current collecting plate 31 is installed into the housing 1 from the port 14, the plane of the positive current collecting plate 31 needs to be welded and fixed with the positive tab of the battery cell 2, the outer circumference of the positive current collecting plate 31 is provided with a positive flange 312 which is bent circumferentially away from the battery cell 2, that is, towards the upper direction, and the positive current collecting plate 31 is also provided with a liquid injection hole 311, so that the electrolyte can be injected into the battery cell 2 through the liquid injection hole 311.
The positive electrode insulating ring 32 is arranged on the positive electrode current collecting plate 31, and has the specific structure that: the outer circumference of the shell 1 is provided with a circle of radial surrounding rolling groove 12, a circle of inner convex ring 13 is formed on the inner circumference of the shell by the rolling groove, the lower edge 132 of the inner convex ring directly butts against the outer circumference of the positive electrode insulating ring 32, and the outer circumference of the positive electrode insulating ring can be completely embedded between the inner circumference of the shell 1 and the positive electrode folded edge 312 of the positive electrode current collecting plate 31, thereby insulation is formed, and meanwhile, the positive electrode current collecting plate 31 can be better contacted with the positive electrode lug of the battery cell 2.
The positive electrode assembly cover 33 is disposed at the port 14, the positive electrode assembly cover 33 is composed of a positive electrode current collecting cover 331 and an insulating pressing ring 332 covering the outer circumference of the positive electrode current collecting cover, a plurality of pressure release grooves 333 may be disposed on the positive electrode current collecting cover 331, as shown in fig. 12-13 and 17-18 of this embodiment, a circular groove is disposed on the bottom surface of the positive electrode current collecting cover 331 as the pressure release groove 333, so that the thickness of a certain portion on the positive electrode current collecting cover 331 can be reduced through the pressure release groove, so that when the internal pressure of the battery core 2 exceeds the limit, the purpose of releasing the pressure and guaranteeing the safe use of the battery can be achieved through the rupture of the pressure release groove 333.
The positive electrode assembly cover 33 is installed in the port 14 of the casing 1, and the outer circumference of the positive electrode assembly cover 331 is pressed against the upper edge 131 of the inner convex ring 13 by the insulating pressing ring 332 to form a seal.
The positive electrode current collecting plate 31 and the positive electrode combined cover 33 are provided with a post lug 34 therebetween, the upper end of the post lug is positioned and fixed on the positive electrode combined cover 33, the lower end of the post lug 34 is positioned and fixed on the positive electrode current collecting plate 31, in particular on the positive electrode current collecting cover 331, and the positioning of the two ends of the post lug 34 is positioned on the same axis, so that the positive electrode current collecting cover 331 can be provided with a positive electrode through the post lug 34.
The positioning and fixing structure of the lower end of the post tab 34 on the positive current collecting plate 31 is that the post tab 34 formed by upward punching is arranged on the positive current collecting plate 31, and the lower end of the post tab 34 and the positive current collecting plate 31 form a connected structure, or the lower end of the post tab 34 is positioned and fixed on the positive current collecting plate 31, or the liquid injection hole 311 is arranged at the axle center of the positive current collecting plate 31, a positioning tube 313 extending upwards along the circumference is arranged at the orifice of the liquid injection hole 311, and the lower end of the post tab 34 is positioned and installed on the positioning tube 313 and welded and fixed.
The positioning and fixing structure of the upper end of the post lug 34 on the positive electrode current collecting cover 331 is that the upper end of the post lug 34 is positioned and fixed in a positioning groove 335 of the positive electrode current collecting cover 331, or a positioning post 334 extending downwards along the axis is arranged on the bottom surface of the positive electrode current collecting cover 331, and the upper end of the post lug 34 passes through the positive electrode insulating ring 32 to be positioned and mounted on the positioning post 334 and welded and fixed.
Meanwhile, the positioning groove 335 is disposed on the bottom surface of the positive current collecting cover 331, a boss 336 can be formed on the top surface of the positive current collecting cover 331 by the positioning groove 335, the upper end of the post tab 34 is positioned and mounted in the positioning groove 335 of the positive current collecting cover 331, the upper end of the post tab 34 can be welded and fixed from the outside through the boss 336, in order to ensure welding firmness, metal materials with different melting points can be selected from the boss and the post tab 34, or the positioning groove 335 is disposed on the bottom surface of the positive current collecting cover 331, a top hole 337 penetrating upwards through the positive current collecting cover 331 is formed at the bottom of the positioning groove 335, when the upper end of the post tab 34 is positioned and mounted in the positioning groove 335 of the positive current collecting cover 331 and welded and fixed, the lower end of the post tab 34 penetrates through the top hole 337 and is welded and fixed, and after welding is finished, the inside of the top hole 337 needs to be sealed through a hole plug 338.
In this embodiment, two types of post tabs 34 are also selected, and the two types of post tabs 34 have different structural designs and different welding modes of the matched structures, one is a hollow tab with non-compressed height as shown in fig. 2-7, and the other is a hollow tab with compressed height as shown in fig. 9-19.
The post tab 34 is a hollow tab with a non-compressed height, and may be in the shape of a hollow cylindrical tab shown in fig. 2 or a hollow inverted cone-shaped tab shown in fig. 5, and when the positive electrode assembly cover 33 is installed in the port 14 of the housing 1, the positive electrode assembly cover is directly pressed against the insulation pressing ring 332 by the curled edge 11 of the port and circumferentially pressed on the outer circumference of the positive electrode current collecting cover 331 to form insulation sealing fixation.
The post tab 34 is a hollow tab with compressed height, when the height of the post tab 34 is not compressed, the positive electrode combined cover 33 is higher than the port 14 of the housing 1, and a welding gap is formed between the positive electrode combined cover 33 and the port 14 of the housing 1, so that the upper end of the post tab 34 is positioned and installed on the positioning post 334, and can enter from the welding gap to be welded and fixed by laser, and then the height of the post tab 34 is compressed, so that the positive electrode combined cover 33 is installed in the port 14 of the housing 1, and can be pressed on the outer circumference of the positive electrode current collecting cover 331 by the curled edge 11 of the port against the insulation pressing ring 332 to form insulation sealing and fixing.
The post tab 34 is a hollow tab with a compressed height, which is a hollow straight tube with a compressible height, the pipe orifices 342 at two ends of the hollow straight tube are on the same axis, the post tab 34 is respectively positioned and sleeved on the positioning pipe 313 and the positioning post 334 of the positive electrode current collecting cover 331 through the pipe orifices 342 at two ends, and then the junction is welded and fixed; the pole lug 34 is a hollow lug with compressed height, or alternatively, a hollow bracket with compressed height is provided with positioning holes 343 on the upper end surface and the lower end surface of the hollow bracket, the positioning holes 343 on the upper end surface and the lower end surface are located on the same axis, the pole lug 34 is respectively positioned and sleeved on the positioning pipe 313 and the positioning pole 334 of the positive electrode current collecting cover 331 through the positioning holes 343 on the upper end surface and the lower end surface, and then the joint is welded and fixed.
When the cylindrical tab 34 is a hollow straight tube, in order to achieve high compression, a plurality of triangular notches 341 are generally disposed on the outer circumferential surface of the cylindrical tab 34, and the plurality of notches are divided into two groups and are disposed on the outer circumferential surfaces of the two sides of the cylindrical tab with the axis of the cylindrical tab 34 as the center, the plurality of notches 341 are driven to deform when the cylindrical tab 34 is compressed, thereby reducing the height of the cylindrical tab 34.
Of course, there are various column tab compression structures using hollow straight tubes, and even the column tab 34 can be compressed to a high degree by simply making the wall of the column tab very thin without designing the notch 341, for example, bellows design or telescopic tube design. In this embodiment, the notch 341 is designed to better achieve the height compression of the cylindrical lug 34 of the hollow straight tube, and the number, shape and size of the notch 341 are not limited, as shown in fig. 25-29, one or two notches can be respectively arranged on the outer circumferential surface of the cylindrical lug 34, one notch is arranged on the other notch, the positions of the notches 341 on both sides can be in an asymmetric position as shown in fig. 25 or in a symmetric position as shown in fig. 26-28, the shape of the notch 341 can also be rectangular or semicircular, and even the notch formed by a similar spring shape can be selected as shown in fig. 29, so long as the height compression of the cylindrical lug 34 can be achieved.
When the post tab 34 is a hollow bracket, the hollow bracket can be selected in various modes, for example, the [ "type, the [ ] ]" type, the square shape, etc. in this embodiment, when the post tab 34 is compressed, the side edge of the hollow bracket is driven to deform to reduce the height of the post tab 34.
Obviously, the original column lug 34 is used for replacing a sheet-shaped lug in the traditional battery structure to serve as a positive electrode current lead-out, and the positioning, mounting and welding fixation can be formed between the positive electrode current collecting plate 31 and the positive electrode combined cover 33 through the column lug 34, so that the positive electrode current collecting plate 31 and the positive electrode combined cover 33 are positioned at a centering position after the lug is welded, the current lead-out is convenient, the use reliability is improved, and the shape structure of the column lug 34 is also beneficial to realizing the automation of battery production; in addition, the compressible height of the post tab 34 facilitates the implementation of the welding process, thereby preferably reducing the manufacturing process and equipment investment for tab welding and effectively reducing the manufacturing cost of the battery product.
The negative electrode terminal 4 includes a negative electrode current collecting plate 41, and the negative electrode current collecting plate is welded and fixed with the negative electrode ear of the battery cell 2 and the bottom of the casing 1, so that the casing 1 is provided with a negative electrode by the negative electrode current collecting plate 41, and the outer circumference of the negative electrode current collecting plate 41 is further provided with a negative electrode folded edge 411 which is bent towards the direction of the battery cell 2, that is, towards the upper direction, and is buckled between the inner circumference of the casing 1 and the outer circumference of the battery cell 2.
The invention relates to a method for manufacturing a battery structure by adopting a column lug, which mainly comprises the following steps:
step one, welding and fixing the plane of the negative electrode current collecting piece 41 with the negative electrode lug of the battery cell 2, and arranging a negative electrode folded edge 411 which is bent circumferentially towards the direction of the battery cell 2 on the outer circumference of the negative electrode current collecting piece 41;
step two, the cell 2 welded with the negative electrode current collecting plate 41 is arranged in the shell 1, the bottom of the shell is closed to be used as a negative electrode end 4, the top of the shell 1 is provided with an open port 14 to be used as a positive electrode end 3, one end of the cell 2 welded with the negative electrode current collecting plate 41 is arranged in the shell 1 through the port 14, and the negative electrode folded edge 411 is buckled between the inner circumferential surface of the shell 1 and the outer circumferential surface of the cell 2;
step three, the positive current collecting piece 31 is arranged in the shell 1 from the port 14, the plane of the positive current collecting piece 31 is welded and fixed with the positive electrode lug of the battery cell 2, the outer circumference of the positive current collecting piece 31 is provided with a positive electrode folded edge 312 which is bent back to the direction of the battery cell 2, the positive current collecting piece 31 is provided with a liquid injection hole 311, and electrolyte is injected into the battery cell 2 through the liquid injection hole 311;
step four, arranging a positive electrode insulating ring 32 on the positive electrode current collecting plate 31, rolling a groove 12 on the outer circumferential surface of the shell 1, forming a ring of inner convex ring 13 on the inner circumferential surface of the shell 1 by the groove, abutting the lower edge 132 of the inner convex ring against the outer circumference of the positive electrode insulating ring 32, and insulating the outer circle Zhou Qian of the positive electrode insulating ring between the inner circumferential surface of the shell 1 and the positive electrode folded edge 312 of the positive electrode current collecting plate 31;
fifthly, welding and fixing the negative electrode current collecting plate 41 with the bottom of the shell 1;
step six, wrapping the outer circumference of the positive electrode current collecting cover 331 with an insulating pressing ring 332 to form a positive electrode combined cover 33;
step seven, a column lug 34 is arranged between the positive electrode current collecting piece 31 and the positive electrode combined cover 33; if the post tab 34 is a hollow tab with non-compressed height, positioning and mounting two ends of the post tab 34 on the positive current collecting plate 31 and the positive current collecting cover 331 of the positive combined cover 33 respectively, and welding and fixing, then the positive combined cover 33 is put into the port 14 of the shell 1, and is directly pressed on the outer circumference of the positive current collecting cover 331 by the curled edge 11 of the port against the insulating pressing ring 332 to form insulating sealing and fixing; if the post tab 34 is a hollow tab with compressed height, the height of the post tab 34 is not compressed, so that the positive electrode combined cover 33 is higher than the port 14 of the shell 1, a welding gap is formed between the positive electrode combined cover 33 and the port 14 of the shell 1, then the welding gap enters to perform laser welding fixation between the upper end of the post tab 34 and the positive electrode current collecting cover 331, then the height of the post tab 34 is compressed, so that the positive electrode combined cover 33 is installed in the port 14 of the shell 1, and is pressed on the outer circumference of the positive electrode current collecting cover 331 by the curled edge 11 of the port against the insulation pressing ring 332 to form insulation sealing fixation;
and step eight, manufacturing a battery structure by adopting the post lugs 34.
The foregoing is merely a specific embodiment of the present invention, and it should be understood by those skilled in the art that any structural design equivalent to the embodiment is included in the scope of the present invention.
Claims (10)
1. The utility model provides a battery structure of post utmost point ear, includes shell (1), electric core (2) in the shell to and set up respectively at the shell both ends, and will electric core (2) seal is sealed positive pole end (3) and negative pole end (4) in shell (1), this positive pole end (3) including positive current collector (31), positive insulating ring (32) and positive combined cover (33) of packing into in proper order by port (14) of shell (1), and positive current collector (31) and the positive tab welding of electric core (2), be equipped with annotate liquid hole (311) on positive current collector (31), positive insulating ring (32) set up on positive current collector (31), positive combined cover (33) set up in port (14) department, its characterized in that positive current collector (31) and positive combined cover (33) between be equipped with post utmost point ear (34), this post utmost point ear (34) upper end location is fixed on positive combined cover (33), post (34) lower extreme is fixed on positive current collector (31) both ends and is in the same axis location post (34).
2. The battery structure adopting the post tab according to claim 1, wherein the positive electrode assembly cover (33) is composed of a positive electrode current collecting cover (331) and an insulating pressing ring (332) coated on the outer circumference of the positive electrode current collecting cover, and a plurality of pressure release grooves (333) are arranged on the positive electrode current collecting cover (331); the upper end of the post lug (34) is fixedly positioned on the positive electrode current collecting cover (331).
3. The battery structure adopting the post tab according to claim 2, characterized in that the positioning and fixing structure of the lower end of the post tab (34) on the positive electrode current collecting plate (31) is that the post tab (34) formed by upward punching is arranged on the positive electrode current collecting plate (31), the lower end of the post tab (34) and the positive electrode current collecting plate (31) form a connected structure, or the lower end of the post tab (34) is positioned and fixed on the positive electrode current collecting plate (31), or a liquid injection hole (311) is arranged at the axle center of the positive electrode current collecting plate (31), a positioning tube (313) extending upwards along the circumference is arranged at the orifice of the liquid injection hole (311), and the lower end of the post tab (34) is positioned and installed on the positioning tube (313) and welded and fixed; the positioning and fixing structure of the upper end of the post lug (34) on the positive electrode current collecting cover (331) is that the upper end of the post lug (34) is positioned and fixed in a positioning groove (335) of the positive electrode current collecting cover (331), or a positioning column (334) extending downwards along the axial lead is arranged on the bottom surface of the positive electrode current collecting cover (331), and the upper end of the post lug (34) penetrates through the positive electrode insulating ring (32) to be positioned and mounted on the positioning column (334) and welded and fixed.
4. A battery structure using a post tab according to claim 3, wherein the positioning groove (335) is provided on the bottom surface of the positive current collecting cover (331), a boss (336) is formed on the top surface of the positive current collecting cover (331) by the positioning groove (335), the upper end of the post tab (34) is positioned and mounted in the positioning groove (335) of the positive current collecting cover (331), the upper end of the post tab (34) is welded and fixed from the outside through the boss (336), or the positioning groove (335) is provided on the bottom surface of the positive current collecting cover (331), a top hole (337) penetrating the positive current collecting cover (331) upward is provided at the bottom of the positioning groove (335), the upper end of the post tab (34) is positioned and mounted in the positioning groove (335) of the positive current collecting cover (331), and the lower end of the post tab (34) is penetrated and welded and fixed through the top hole (337) between the lower end of the post tab (34) and the positive current collecting plate (31).
5. A battery structure using a post tab according to claim 3, wherein the post tab (34) is a hollow tab with a non-compressed height, the positive electrode assembly cover (33) is installed in the port (14) of the housing (1), and is pressed circumferentially against the insulating pressing ring (332) by the curled edge (11) of the port to form an insulating sealing fixation on the outer circumference of the positive electrode assembly cover (331); the pole lug (34) is a hollow pole lug with compressed height, when the height of the pole lug (34) is not compressed, the positive electrode combined cover (33) is higher than the port (14) of the shell (1), a welding gap is formed between the positive electrode combined cover (33) and the port (14) of the shell (1), the upper end of the pole lug (34) is positioned and installed on the positioning pole (334) and enters from the welding gap to be welded and fixed by laser, and the height of the pole lug (34) is compressed again, so that the positive electrode combined cover (33) is installed in the port (14) of the shell (1) and pressed on the outer circumference of the positive electrode combined cover (331) by the curled edge (11) of the port in an insulation pressing ring (332) in a circumferential manner to form insulation sealing and fixing.
6. The battery structure adopting the column electrode lug according to claim 5, wherein the column electrode lug (34) is a hollow straight tube with compressed height, the pipe orifices (342) at two ends of the hollow straight tube are positioned on the same axis, and the column electrode lug (34) is respectively positioned and fixed on the positioning pipe (313) of the liquid injection hole (311) and the positioning column (334) of the positive electrode current collecting cover (331) through the pipe orifices (342) at two ends; the pole lug (34) is a hollow bracket with compressed height, the upper end face and the lower end face of the hollow bracket are respectively provided with a positioning hole (343), the positioning holes (343) of the upper end face and the lower end face are positioned on the same axis, and the pole lug (34) is respectively positioned and fixed on the positioning pipe (313) of the liquid injection hole (311) and the positioning pole (334) of the positive electrode current collecting cover (331) through the positioning holes (343) of the upper end face and the lower end face.
7. The battery structure adopting the column lug as set forth in claim 6, wherein the outer circumferential surface of the hollow straight tube is provided with a plurality of notches (341), the hollow straight tube is compressed, and the notches (341) are driven to deform so as to reduce the height of the column lug (34); the hollow support is compressed and drives the side of the hollow support to deform so as to reduce the height of the pole lug (34).
8. A battery structure using a post tab according to claim 1, characterized in that the outer circumferential surface of the housing (1) is provided with a ring of radially encircling rolling grooves (12) and a ring of inner convex rings (13) are formed on the inner circumferential surface of the housing by the rolling grooves; the lower edge (132) of the inner convex ring is propped against the outer circumference of the positive electrode insulating ring (32); the positive electrode combined cover (33) is arranged in the port (14) of the shell (1), and the outer circumference of the positive electrode combined cover (331) is propped against the upper edge (131) of the inner convex ring (13) through the insulating pressing ring (332) to form a seal.
9. The battery structure adopting the column tab according to claim 1, wherein the negative electrode terminal (4) is a closed end of the bottom of the casing (1) which is not opened, the negative electrode terminal (4) comprises a negative electrode current collecting piece (41), the negative electrode tab of the battery cell (2) and the bottom of the casing (1) are respectively welded and fixed by the negative electrode current collecting piece, a negative electrode folded edge (411) which is bent circumferentially towards the direction of the battery cell (2) is arranged on the outer circumference of the negative electrode current collecting piece (41), and the negative electrode folded edge is buckled between the inner circumference surface of the casing (1) and the outer circumference surface of the battery cell (2).
10. A method for manufacturing a battery structure employing a post tab according to any one of claims 1 to 9, characterized by comprising the steps of:
welding and fixing the plane of the negative electrode current collecting piece (41) and the negative electrode lug of the battery cell (2), and arranging a negative electrode folded edge (411) which is bent circumferentially towards the direction of the battery cell (2) on the outer circumference of the negative electrode current collecting piece (41);
step two, the cell (2) welded with the negative current collecting plate (41) is arranged in a shell (1), the bottom of the shell is closed to be used as a negative end (4), an open port (14) is arranged at the top of the shell (1) to be used as a positive end (3), one end of the cell (2) welded with the negative current collecting plate (41) is arranged in the shell (1) through the port (14), and a negative flange (411) is buckled between the inner circumferential surface of the shell (1) and the outer circumferential surface of the cell (2);
step three, loading the positive current collecting plate (31) into the shell (1) from the port (14), welding and fixing the plane of the positive current collecting plate (31) with the positive lug of the battery core (2), arranging a positive folded edge (312) which bends circumferentially back to the direction of the battery core (2) on the outer circumference of the positive current collecting plate (31), arranging a liquid injection hole (311) on the positive current collecting plate (31), and injecting electrolyte into the battery core (2) through the liquid injection hole (311);
step four, arranging a positive electrode insulating ring (32) on a positive electrode current collecting plate (31), rolling a groove (12) on the outer circumferential surface of the shell (1), forming a ring of inner convex ring (13) on the inner circumferential surface of the shell (1) by the groove, abutting the lower edge (132) of the inner convex ring against the outer circumference of the positive electrode insulating ring (32), and enabling the outer circle Zhou Qian of the positive electrode insulating ring to be between the inner circumferential surface of the shell (1) and a positive electrode folded edge (312) of the positive electrode current collecting plate (31);
fifthly, welding and fixing the negative electrode current collecting piece (41) and the bottom of the shell (1);
step six, wrapping the outer circumference of the positive electrode current collecting cover (331) with an insulating pressing ring (332) to form a positive electrode combined cover (33);
step seven, a column lug (34) is arranged between the positive electrode current collecting sheet (31) and the positive electrode combined cover (33); if the pole lug (34) is a hollow pole lug with non-compressed height, positioning and mounting two ends of the pole lug (34) on the positive pole current collecting plate (31) and the positive pole current collecting cover (331) of the positive pole combined cover (33) respectively, and welding and fixing, putting the positive pole combined cover (33) into the port (14) of the shell (1), directly propping against the insulation pressing ring (332) by the curled edge (11) of the port, and circumferentially pressing on the outer circumference of the positive pole current collecting cover (331) to form insulation sealing and fixing; if the pole lug (34) is a hollow pole lug with compressed height, the height of the pole lug (34) is not compressed, so that the positive electrode combined cover (33) is higher than the port (14) of the shell (1), a welding gap is formed between the positive electrode combined cover (33) and the port (14) of the shell (1), then the welding gap enters to perform laser welding fixation between the upper end of the pole lug (34) and the positive electrode current collecting cover (331), and then the height of the pole lug (34) is compressed, so that the positive electrode combined cover (33) is arranged in the port (14) of the shell (1) and is pressed on the outer circumference of the positive electrode current collecting cover (331) by the curled edge (11) of the port against the insulating pressing ring (332) to form insulating sealing fixation;
and step eight, manufacturing a battery structure by adopting the post lugs (34).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310517098.7A CN116315476A (en) | 2023-05-09 | 2023-05-09 | Battery structure adopting post lugs and manufacturing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310517098.7A CN116315476A (en) | 2023-05-09 | 2023-05-09 | Battery structure adopting post lugs and manufacturing method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4333165A3 (en) * | 2022-09-01 | 2024-03-20 | VARTA Microbattery GmbH | Energy storage element, cover assembly and method of manufacture |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4333165A3 (en) * | 2022-09-01 | 2024-03-20 | VARTA Microbattery GmbH | Energy storage element, cover assembly and method of manufacture |
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