CN112542641B - A cylindrical battery and its manufacturing method - Google Patents
A cylindrical battery and its manufacturing method Download PDFInfo
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- CN112542641B CN112542641B CN202011430861.5A CN202011430861A CN112542641B CN 112542641 B CN112542641 B CN 112542641B CN 202011430861 A CN202011430861 A CN 202011430861A CN 112542641 B CN112542641 B CN 112542641B
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 20
- 238000004804 winding Methods 0.000 claims abstract description 60
- 238000003466 welding Methods 0.000 claims abstract description 28
- 239000003792 electrolyte Substances 0.000 claims abstract description 25
- 238000000034 method Methods 0.000 claims abstract description 15
- 230000008569 process Effects 0.000 claims abstract description 12
- 239000007788 liquid Substances 0.000 claims description 33
- 238000002347 injection Methods 0.000 claims description 25
- 239000007924 injection Substances 0.000 claims description 25
- 238000007789 sealing Methods 0.000 claims description 21
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 9
- 229910052782 aluminium Inorganic materials 0.000 claims description 9
- 210000005069 ears Anatomy 0.000 claims description 4
- 238000003698 laser cutting Methods 0.000 abstract description 9
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 abstract description 7
- 229910001416 lithium ion Inorganic materials 0.000 abstract description 7
- 230000007306 turnover Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000003446 memory effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000000243 solution 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
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
本发明公开了一种圆柱电池及其制造方法，涉及锂离子电池制造领域，本发明结构简单，本发明通过将极耳设置在卷芯的一端面上，在一定程度上能够降低卷芯的高度，同时可以仅对壳体一端进行开口和封口，降低了圆柱电池的整体重量，在圆柱电池的制造方法上，相较于现有技术中使用全极耳的极片，本发明在工艺上增设了对极片的激光切割，通过激光切割和后续对极耳的焊接揉平工艺的配合，能够使正负极片卷绕形成的卷芯一端形成正极耳区域、负极耳区域和非极耳区域，将极耳之间的非焊接区域进行省略，降低了卷绕后正负极耳之间接触的致密性，使后续注入电解液时，能够加快电解液浸润正负极片的速率，有效提高圆柱电池的生产效率。
The invention discloses a cylindrical battery and a manufacturing method thereof, and relates to the field of lithium ion battery manufacturing. The invention has a simple structure and can reduce the height of the winding core to a certain extent by arranging the tab on one end face of the winding core. At the same time, only one end of the casing can be opened and sealed, which reduces the overall weight of the cylindrical battery. In the manufacturing method of the cylindrical battery, compared with the pole piece using the full pole lug in the prior art, the present invention adds a process. The laser cutting of the counter-pole piece, through the cooperation of laser cutting and the subsequent welding and flattening process of the counter-pole tab, can make one end of the winding core formed by winding the positive and negative pole pieces to form the positive ear area, the negative ear area and the non-pole ear area. , the non-welded area between the tabs is omitted, which reduces the compactness of the contact between the positive and negative tabs after winding, so that when the electrolyte is injected later, the rate at which the electrolyte infiltrates the positive and negative plates can be accelerated, effectively improving the Production efficiency of cylindrical cells.
Description
Technical Field
The invention relates to the field of lithium ion battery manufacturing, in particular to a cylindrical battery and a manufacturing method thereof.
Background
The lithium battery has the advantages of small volume, large capacity, long service life, low self-discharge rate, no memory effect, environmental protection and the like, and is widely applied to commercial vehicles, special vehicles, electric bicycles, energy storage systems, medical instruments and the like at present. At present, under the condition that the overall dimension of the battery is certain, along with the increase of the capacity of the battery, the space inside the battery is reduced, the battery is difficult to inject liquid, and certain safety risk exists.
At present, a cylindrical battery generally adopts a mode that positive and negative electrode lugs are respectively arranged at two ends, meanwhile, the positive and negative electrode lugs are continuous long strip sheets, after the positive and negative electrodes are wound and formed, and the positive and negative electrode lugs are rubbed and flattened, the connection between the positive and negative electrode lugs is very compact, electrolyte is difficult to infiltrate the positive and negative electrode plates, and meanwhile, the mode that the lugs are arranged at two ends is adopted, so that the height of a roll core is too high, and the density of the battery is relatively low.
Disclosure of Invention
The present invention is directed to a cylindrical battery and a method for manufacturing the same, which improves the overall structure of a lithium ion cylindrical battery to further improve the manufacturing process of the lithium ion cylindrical battery, so as to solve the problems mentioned in the background art.
In order to achieve the purpose, the invention provides the following technical scheme:
the utility model provides a cylindrical battery, includes the book core that is formed by positive plate, negative pole piece coiling, embeds the casing that rolls up the core, a plurality of anodal ear of positive plate and a plurality of negative pole ear of negative pole piece all are located same terminal surface, a plurality of anodal ear and negative pole ear all are discontinuous and the setting of being interrupted on positive plate respectively, form non-utmost point ear region between the positive ear of rolling up the core, positive negative ear surface difference fixedly connected with positive and negative current collecting disc of rolling up the core, the one end that current collecting disc kept away from roll core is equipped with the apron, the liquid mouth of annotating that is linked together with the casing inner chamber is seted up on the apron surface, apron upper surface both sides fixedly connected with anodal post and negative pole post respectively.
As a further scheme of the invention: the liquid injection port is internally and fixedly connected with a sealing nail, and the outer end face of the liquid injection port is covered with a sealing aluminum sheet.
As a further scheme of the invention: the positive and negative current collecting discs are provided with grooves at the ends far away from the roll core, the positive and negative pole pieces are wound to form the roll core with positive and negative semicircular pole lugs, the pole lugs are in a boss form, the positive current collecting discs are fixedly attached to the positive pole lugs, the negative current collecting discs are fixedly attached to the negative pole lugs, and the grooves on the end faces of the positive and negative current collecting discs are aligned to the positive and negative pole lugs respectively.
As a further scheme of the invention: all be equipped with insulating the pad between positive negative pole post and the apron, all be equipped with the insulating piece between apron and the positive negative current collector dish, positive pole post, insulating pad, apron, insulating piece and positive current collector dish all link to each other through positive rivet is fixed in proper order, negative pole post, insulating pad, apron, insulating piece and negative current collector dish all are through negative rivet fixed connection in proper order.
The manufacturing method of the cylindrical battery comprises the following steps:
respectively carrying out laser slicing on the positive and negative electrode sheets, forming a plurality of discontinuous and discontinuous electrode lugs on the positive and negative electrode sheets, and winding the cut positive and negative electrode lugs and a diaphragm together to form a winding core with the positive and negative electrode lugs positioned at the same end and in a semicircular shape;
step two, after the positive electrode lug and the negative electrode lug of the winding core are sequentially subjected to ultrasonic welding and mechanical flattening, the positive current collecting disc and the negative current collecting disc are respectively welded and fixed with the positive electrode lug and the negative electrode lug, and the winding core is placed into a shell;
step three, fixedly connecting the cover plate with the current collecting disc through the pole, turning over the positive current collecting disc and the negative current collecting disc to drive the cover plate to turn over for 180 degrees and to be matched and fixed with the shell, and injecting electrolyte into the shell through the liquid injection hole in the cover plate;
and step four, after the liquid injection is finished, sealing the liquid injection hole in the cover plate for the first time through a sealing nail, and sealing the cover plate for the second time by using a sealing aluminum sheet.
As a further scheme of the invention: the positive and negative electrode lugs on the positive and negative electrode plates subjected to laser slicing in the step one are all in shapes of unequal distance and unequal width, the winding core formed in the step one comprises a positive and negative electrode lug area and a non-electrode lug area, and the non-electrode lug area is communicated with the cover plate liquid injection hole and the inner cavity of the shell.
As a further scheme of the invention: in the welding process of the second step, the positive current collecting disc is welded with the positive pole lug in an attaching mode, the negative current collecting disc is welded with the negative pole lug in an attaching mode, and the arc-shaped grooves in the surfaces of the positive current collecting disc and the negative current collecting disc are laser welding areas.
Compared with the prior art, the invention has the beneficial effects that: the invention has novel structure, the pole ear is arranged on one end surface of the roll core, the height of the roll core can be reduced to a certain extent, and simultaneously, the opening and the sealing can be carried out only on one end of the shell, the whole weight of the cylindrical battery is reduced, because the invention changes the whole design structure of the cylindrical battery, the manufacturing process of the cylindrical battery is changed to a certain extent, compared with the pole piece of the full pole ear in the prior art, the invention adds the laser cutting of the pole piece, the non-welding area between the pole ears is omitted by the matching of the laser cutting and the subsequent welding and flattening process of the pole ear, the positive pole ear area, the negative pole ear area and the non-pole ear area can be formed at one end of the roll core formed by winding the positive pole piece and the negative pole piece, the contact compactness between the positive pole ear and the negative pole ear after winding is reduced, and the infiltration rate of the electrolyte can be accelerated when the electrolyte is injected subsequently, effectively improve the production efficiency of the cylindrical battery.
Drawings
Fig. 1 is a schematic view of the overall structure of a cylindrical battery;
FIG. 2 is a schematic view of a cylindrical battery roll core;
FIG. 3 is a schematic diagram of a cover plate structure of a cylindrical battery;
FIG. 4 is a schematic structural diagram of positive and negative electrode plates of a cylindrical battery;
FIG. 5 is a schematic structural view of a cylindrical battery in an uncovered state;
fig. 6 is a schematic structural view of a cylindrical battery in a closed state.
In the figure: 1-cover plate, 2-current collecting disc, 3-coil core, 4-shell, 5-pole, 6-rivet, 7-insulating pad and 8-insulating sheet.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, in an embodiment of the present invention, a cylindrical battery includes a winding core 3 formed by winding a positive plate and a negative plate, and a case 4 with a built-in winding core, where a plurality of positive tabs of the positive plate and a plurality of negative tabs of the negative plate are located on a same end surface, and the positive tabs and the negative tabs are respectively discontinuously and discontinuously disposed on the positive plate and the negative plate, and compared with a continuous long-sheet positive tab and a continuous long-sheet negative tab in the prior art, the present invention reduces the overall weight of the cylindrical battery to a certain extent.
After the positive plate with the plurality of positive lugs and the negative plate with the plurality of negative lugs are wound to form a winding core, a positive lug area, a negative lug area and a non-lug area are formed on one end surface of the winding core, and the positive lugs are subjected to ultrasonic welding and flattening after the lugs are wound; meanwhile, the positive and negative lugs of the positive and negative pole pieces are arranged on the same side, and after the positive and negative lugs are wound into a roll core, the formed positive lug area and the negative lug area are positioned at the same end of the roll core.
As shown in fig. 2 and 4, the positive and negative electrode tabs wound by the positive and negative electrode tabs have a spacing therebetween, the spacing is a non-tab region for injecting liquid into the winding core, and a plurality of discontinuous positive and negative electrode tabs are formed into the winding core with a certain spacing therebetween by a laser cutting process after winding, so that the welding and flattening of the winding core are not affected, and the omitted non-tab region is convenient for subsequently adding electrolyte into the winding core, and is also convenient for the electrolyte to infiltrate the positive and negative electrode tabs.
Positive negative lug surface fixedly connected with positive negative current collector dish respectively of book core, positive negative current collector dish is kept away from the circular shape one end and is all equipped with the recess, the recess is convex, makes through the punching press, therefore the recess back of positive negative current collector dish forms a convex arch. Positive and negative pole piece is convoluteed and is formed the book core that has positive and negative semicircle annular pole piece, utmost point ear is the boss form, positive current collection dish is laminated fixedly mutually with positive ear, the recess and the positive ear of positive current collection dish terminal surface align, and the convex arch that its recess corresponds the back contacts with positive ear, the recess and the negative pole ear of negative current collection dish terminal surface align, and the convex arch that its recess corresponds the back contacts with the negative pole ear, positive and negative current collection dish passes through laser welding with positive and negative ear and fixes. The arc shape of the groove is a laser welding track, the end face of the current collecting disc is provided with the groove, on one hand, the current collecting disc can be in contact with the lug through a protrusion formed by the groove, the cold welding area between the current collecting disc and the lug is reduced to a certain extent, the welding strength between the current collecting disc and the lug is further improved, and on the other hand, the laser welding track is limited, so that the process machining operation is facilitated.
The one end that roll core was kept away from to the current collecting disc is equipped with the apron, the liquid mouth of annotating that is linked together with the casing inner chamber is seted up on the apron surface, apron upper surface both sides fixedly connected with anodal post and negative pole post respectively, all be equipped with insulating the pad between positive and negative utmost point post and the apron, all be equipped with the insulating piece between apron and the positive and negative current collecting disc, anodal post, insulating pad, apron, insulating piece and positive current collecting disc all link to each other through anodal rivet is fixed in proper order, negative pole post, insulating pad, apron, insulating piece and negative current collecting disc all are through negative pole rivet fixed connection in proper order, under the mutually supporting between above-mentioned each structure, can realize positive and negative utmost point post and be insulating between positive and negative pole piece respectively.
In the manufacturing process of the cylindrical battery, electrolyte is injected into the winding core of the shell through the liquid injection port on the surface of the cover plate, and the electrolyte flows downwards to infiltrate into the winding core of the shell through the non-tab area. Annotate the interior fixedly connected with of liquid port and seal the nail, annotate the outer terminal surface of liquid port and cover and have sealed aluminum sheet, through carrying out primary seal in annotating the liquid port with the sealing member welding, will sealed fixed the completion of nail after, again at the position welding a sealed aluminum sheet of annotating the liquid port, carry out secondary seal to annotating the liquid port.
The manufacturing method of the lithium ion cylindrical battery comprises the following steps:
respectively carrying out laser slicing on the positive and negative electrode sheets, forming a plurality of discontinuous and discontinuous electrode lugs on the positive and negative electrode sheets, and winding the cut positive and negative electrode lugs and a diaphragm together to form a winding core with the positive and negative electrode lugs positioned at the same end and in a semicircular shape;
step two, after the positive electrode lug and the negative electrode lug of the winding core are sequentially subjected to ultrasonic welding and mechanical flattening, the positive current collecting disc and the negative current collecting disc are respectively welded and fixed with the positive electrode lug and the negative electrode lug, and the winding core is placed into a shell;
step three, fixedly connecting the cover plate with the current collecting disc through the pole, turning over the positive current collecting disc and the negative current collecting disc to drive the cover plate to turn over for 180 degrees and to be matched and fixed with the shell, and injecting electrolyte into the shell through the liquid injection hole in the cover plate;
and step four, after the liquid injection is finished, sealing the liquid injection hole in the cover plate for the first time through a sealing nail, and sealing the cover plate for the second time by using a sealing aluminum sheet.
As shown in fig. 4, in the first step, the positive and negative electrode sheets are subjected to laser cutting by adjusting parameters of a laser sheet making machine, the required electrode tabs are cut at the electrode tab ends of the electrode sheets by laser, the positive and negative electrode tabs subjected to laser cutting are all formed into shapes with unequal intervals and unequal widths, after the positive and negative electrode tabs and the diaphragm are rolled to form the roll core, as shown in fig. 2, an electrode tab area and a non-electrode tab area with a certain width are formed on one end surface of the roll core, compared with the electrode tab full-flattening process in the prior art, the electrode tabs with discontinuous intervals are unfolded in the invention, and the rolled electrode tabs are partially flattened, so that the full electrode tabs in the prior art form the electrode tab area and the non-electrode tab area in the invention, and a certain gap is formed between the rolled electrode sheets, so that the electrolyte can rapidly flow into and infiltrate the rolled positive and negative electrode sheets from the non-electrode tab area.
As shown in fig. 2 and 3, in the second step, the pole piece is wound to form a roll core, the positive and negative pole pieces respectively form positive and negative semicircular bosses at the upper end of the roll core, the positive and negative semicircular bosses are respectively fixedly connected with the positive and negative current collecting discs, and the surfaces of the positive and negative current collecting discs are provided with circular arc grooves which are made by punching, so that circular arc protrusions are formed on the back surfaces of the grooves of the positive and negative current collecting discs and are in contact with and fixed to the circular arc bosses of the positive and negative poles, and although the contact between the circular arc protrusions and the semicircular bosses of the positive and negative poles reduces the contact area between the pole lugs and the current collecting discs, the virtual welding area between the pole lugs and the current collecting discs is further reduced, and the welding fastening degree between the pole lugs and the current collecting discs is improved to a certain extent.
As shown in fig. 1 and 6, in the third step, the cover plate is fixedly connected with the current collecting plate through the pole, the positive current collecting plate and the negative current collecting plate are turned over to drive the cover plate to turn over for 180 degrees and to be matched with the shell, the cover plate matched with the shell is welded and fixed through peripheral welding, and at the moment, a certain amount of electrolyte is injected into the shell through the electrolyte injection hole, so that the winding core is fully soaked by the electrolyte.
As shown in fig. 1 and 5, in the state that the lithium ion battery is not sealed, as shown in fig. 6, in the fourth step, the liquid injection hole on the cover plate is firstly sealed by the sealing nail, and then the sealing aluminum sheet is welded on the periphery to carry out secondary sealing on the cover plate.
The existence of the non-tab area is convenient for the electrolyte to be injected into the shell through the liquid injection hole subsequently. In the process of liquid injection, the electrolyte can rapidly flow into the lower part of the battery along the lug area, and the positive and negative pole pieces can be soaked by the electrolyte more rapidly in the same time.
The winding core formed by winding the positive and negative electrode tabs and the diaphragm is subjected to a tab flattening process, the positive and negative electrode tabs are firstly welded through ultrasonic waves, then mechanical flattening is carried out, the end face of the winding core is welded through ultrasonic waves, layers of the foil materials of the positive and negative electrode tabs are bonded and fixed, and the outer layer of the foil material can be prevented from being folded when the end face of the winding core is subsequently flattened.
As shown in fig. 2, after the cut positive and negative mechanisms are wound, a positive tab with a semicircular lug end surface and a negative tab with a semicircular lug end surface are formed, and a non-tab area is formed in a gap between the positive tab and the negative tab, so that electrolyte can be conveniently injected into the winding core through the non-tab area.
And step two, arc-shaped grooves are formed in the surfaces of the positive and negative current collecting discs, the arc-shaped grooves are welding areas of the current collecting discs and the positive and negative electrode lugs, the positive current collecting discs and the positive electrode lugs are welded in a fit mode during welding, the negative current collecting discs and the negative electrode lugs are welded in a fit mode, and the arc-shaped grooves in the positive and negative current collecting discs are attached to the end faces of the positive and negative semicircular bosses in the winding core and are subjected to laser welding. Because a non-tab area exists between the positive and negative tabs, a certain gap also exists between the positive current collecting disc and the negative current collecting disc, so that electrolyte can be conveniently injected into the shell subsequently, after the current collecting disc connected with the cover plate and the tabs are welded, the winding core is placed into the shell, the cover plate is turned over to drive the positive current collecting disc and the negative current collecting disc to be turned over by 180 degrees, the cover plate and the shell are matched with each other, and then the winding core and the shell are welded at the periphery to fix the winding core and the shell. The positive and negative current collecting discs and the cover plate are designed in an integrated mode, and the positive and negative current collecting discs and the cover plate are fixed through rivets to prefabricate the whole structure.
And in the third step, the surface of the cover plate is provided with a liquid injection hole, so that a certain amount of electrolyte can be conveniently injected into the shell, the periphery of the cover plate is designed into a step structure, the step shape can be matched with the opening of the shell, and the battery cell can be conveniently placed into the shell and closed with the lithium ion battery.
As shown in fig. 1-3, there are positive pole and negative pole column fixedly connected to both sides of the upper surface of the cover plate, the positive pole and the negative pole column are connected to the positive and negative pole ears through the cover plate, the insulating pads are arranged between the positive and negative pole columns and the cover plate, the insulating sheets are arranged between the cover plate and the positive and negative current collecting plates, the positive pole, the insulating pads, the cover plate, the insulating sheets and the positive current collecting plate are sequentially and fixedly connected through positive rivets, and the negative pole, the insulating pads, the cover plate, the insulating sheets and the negative current collecting plate are sequentially and fixedly connected through negative rivets.
The invention has novel structure and stable operation, when in use, a winding core with positive and negative electrode lugs having a certain distance is formed by winding the positive and negative electrode plates with the lugs at one end, the positive and negative electrode lugs of the winding core are welded and the welding area is rubbed, the positive and negative electrode lugs with a certain distance on the winding core are respectively welded and fixed with the positive and negative current collecting discs, the cover plate and the positive and negative current collecting discs are folded for 180 degrees, the cover plate and the opening of the shell are matched and fixed with each other, electrolyte is injected into the shell through the liquid injection port, the winding core is soaked, the liquid injection port is sealed for the first time through the sealing nail, and an aluminum sheet is welded on the outer surface of the liquid injection port for secondary sealing and fixing.
In the cylindrical battery in the prior art, a winding core generally adopts a mode of leading lugs from two ends, both ends of the battery need to be sealed by cover plates, the process is complex and the cost is increased, the invention can reduce the height of the winding core to a certain extent by arranging the lugs on one end surface of the winding core, and can only open and seal one end of a shell, thereby reducing the overall weight of the cylindrical battery, the invention changes the overall design structure of the cylindrical battery, thereby generating certain change to the manufacturing process of the cylindrical battery, compared with the pole piece using a full lug in the prior art, the invention adds laser cutting of the pole piece, and can lead one end of the winding core formed by winding positive and negative pole pieces to form a positive pole lug area, a negative pole lug area and a non-pole lug area by matching the laser cutting and the subsequent welding and flattening processes of the lugs, and omit the non-welding area between the lugs, the contact compactness between the positive and negative electrode lugs after winding is reduced, so that the rate of the positive and negative electrode plates infiltrated by the electrolyte can be accelerated when the electrolyte is injected subsequently, and the production efficiency of the cylindrical battery is effectively improved.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (7)
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011430861.5A CN112542641B (en) | 2020-12-09 | 2020-12-09 | A cylindrical battery and its manufacturing method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011430861.5A CN112542641B (en) | 2020-12-09 | 2020-12-09 | A cylindrical battery and its manufacturing method |
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| CN112542641A CN112542641A (en) | 2021-03-23 |
| CN112542641B true CN112542641B (en) | 2022-03-11 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113224474A (en) * | 2021-05-14 | 2021-08-06 | 陕西奥林波斯电力能源有限责任公司 | Pole connection structure of large-capacity battery |
| CN113314763A (en) * | 2021-06-24 | 2021-08-27 | 星恒电源股份有限公司 | Cylindrical battery roll core and manufacturing method thereof |
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