CN114421001A - High-safety high-magnification cylindrical battery and assembly process thereof - Google Patents
High-safety high-magnification cylindrical battery and assembly process thereof Download PDFInfo
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- CN114421001A CN114421001A CN202210105841.3A CN202210105841A CN114421001A CN 114421001 A CN114421001 A CN 114421001A CN 202210105841 A CN202210105841 A CN 202210105841A CN 114421001 A CN114421001 A CN 114421001A
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- cover plate
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- lower cover
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 230000008569 process Effects 0.000 title claims abstract description 14
- 238000004804 winding Methods 0.000 claims abstract description 44
- 238000007789 sealing Methods 0.000 claims abstract description 20
- 239000012212 insulator Substances 0.000 claims description 17
- 230000007306 turnover Effects 0.000 claims description 16
- 239000007788 liquid Substances 0.000 claims description 10
- 230000004888 barrier function Effects 0.000 claims description 6
- 238000007493 shaping process Methods 0.000 claims description 6
- 238000005520 cutting process Methods 0.000 claims description 5
- 238000005096 rolling process Methods 0.000 claims description 4
- 230000002093 peripheral effect Effects 0.000 claims 1
- 238000004080 punching Methods 0.000 claims 1
- 238000013461 design Methods 0.000 abstract description 14
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 238000012546 transfer Methods 0.000 abstract description 7
- 238000002347 injection Methods 0.000 description 9
- 239000007924 injection Substances 0.000 description 9
- 238000003466 welding Methods 0.000 description 8
- 239000003792 electrolyte Substances 0.000 description 6
- 238000010521 absorption reaction Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 210000005069 ears Anatomy 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000005219 brazing Methods 0.000 description 1
- MZZUATUOLXMCEY-UHFFFAOYSA-N cobalt manganese Chemical compound [Mn].[Co] MZZUATUOLXMCEY-UHFFFAOYSA-N 0.000 description 1
- QHGJSLXSVXVKHZ-UHFFFAOYSA-N dilithium;dioxido(dioxo)manganese Chemical compound [Li+].[Li+].[O-][Mn]([O-])(=O)=O QHGJSLXSVXVKHZ-UHFFFAOYSA-N 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 238000003698 laser cutting Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000005405 multipole Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000010959 steel 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
-
- 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
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/271—Lids or covers for the racks or secondary casings
-
- 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
- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside 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
- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
- H01M50/507—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing comprising an arrangement of two or more busbars within a container structure, e.g. busbar modules
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Gas Exhaust Devices For Batteries (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The invention provides a high-safety high-magnification cylindrical battery and an assembly process thereof, wherein a winding core is fixedly installed inside a shell through a cover plate assembly, the cover plate assembly comprises an upper cover plate, a lower cover plate and a sealing insulating piece, the periphery of the lower cover plate is hermetically connected to an inner ring at the upper end of the shell through the sealing insulating piece, the lower end of the winding core is fixedly connected to the bottom of the shell through a second confluence disc, the upper end of the winding core is fixedly connected to the lower end of the lower cover plate through a first confluence disc, the upper cover plate is fixedly installed at the upper end of the lower cover plate, the outer edge of the upper cover plate is clamped to the inner ring at the upper end of the shell, and a first insulating piece is arranged between the upper cover plate and the lower cover plate. The shell is directly connected with the cathode or anode bus-bar tray, no pole post treatment is carried out on the shell, the cost is reduced, heat can be directly transferred to the shell through the bus-bar tray, the heat transfer efficiency is improved, and meanwhile, the cylindrical winding core is changed into the structure that the anode and the cathode are on the same side by adopting the double-layer design of the upper cover plate and the lower cover plate, so that the production is convenient.
Description
Technical Field
The invention belongs to the field of battery manufacturing, and particularly relates to a high-safety high-magnification cylindrical battery and an assembly process thereof.
Background
The cylindrical battery is a battery with high capacity, long cycle life and wide use environment temperature, and is divided into different systems of lithium iron phosphate, lithium cobaltate, lithium manganate and cobalt-manganese mixed ternary materials, and the shell is divided into a steel shell and a polymer; 1) the traditional cylindrical battery cover has a complex structure; the cap is used as a positive electrode, the shell is used as a negative electrode, and the positive electrode and the negative electrode are conductively connected from two ends of the cylindrical battery when the battery module is assembled, so that the design and welding of an external module bus bar are inconvenient; in addition, the power performance of the battery is influenced by less lugs. 2. In the cylindrical battery in the prior art, the anode and the cathode are all led to the same side by riveting the pole at the bottom of the U-shaped shell, and the riveting of the pole in the shell greatly increases the cost; 3) the traditional cylindrical winding core adopts one or 2 tab structures, so that the resistance is high, and the rate capability of the winding core is poor; 4) the large cylinder adopts a full tab flattening process, firstly, the axial space needs to occupy several millimeters, and in addition, the tab is easy to be reversely inserted and short-circuited in the flattening process, so that the safety risk exists; 5) with the increase of the size of the cylinder, the conventional tab form or structure form is difficult to conduct heat and transfer heat quickly; 6) the large cylinder structural design generally only has an explosion-proof valve, and measures are not taken in the aspect of preventing overcharge to influence the safety performance of the winding core.
Disclosure of Invention
In view of the above, the present invention is directed to a high-safety high-rate cylindrical battery, so as to solve the problems of the prior art that the cylindrical battery has a complicated structure and the safety performance is low as the diameter of the cylinder increases.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the utility model provides a high safe high magnification cylinder type battery, which comprises a housin, roll up core and apron subassembly, the casing is the tubbiness structure, it passes through inside apron subassembly fixed mounting to the casing to roll up the core, the apron subassembly includes the upper cover plate, apron and sealed insulator down, the apron periphery is through sealed insulator sealing connection to casing upper end inner circle down, the lower extreme of rolling up the core converges through the second and coils fixed connection to the casing bottom, the upper end of rolling up the core converges through the first lower extreme of converging dish fixed connection to apron down, the upper end fixed mounting upper cover plate of apron down, upper cover plate outer fringe joint to casing upper end inner circle, and set up first insulator between upper cover plate and the apron down.
Further, roll up the core and include positive plate, negative plate and barrier film, positive plate and negative plate parallel arrangement each other, and the barrier film is located between positive plate and the negative plate, roll up the core and be the positive plate, negative plate and barrier film superpose the post-forming cylinder structure each other, the upper end of positive plate sets up a plurality of first bosss, and a plurality of first bosss form anodal ear along with the positive plate after convoluteing, the negative plate lower extreme sets up a plurality of second bosss, and a plurality of second bosss form the negative pole ear along with the negative plate after convoluteing, anodal ear fixed connection is to the lower extreme of first disc that converges, negative pole ear fixed connection is to the upper end of second disc that converges.
Furthermore, a second insulating part is arranged between the first confluence disc and the lower cover plate, and one end of the first confluence disc penetrates through the second insulating part and then is fixedly connected to the lower end of the lower cover plate.
Further, the lower cover plate comprises a first plate body and a first groove-shaped boss arranged at the upper end of the first plate body, the outer edge of the first plate body is connected to the inner ring at the upper end of the shell through a sealing insulator in a sealing mode, a liquid injection hole and an explosion-proof nick are arranged on the first groove-shaped boss respectively, a seal nail is installed in the liquid injection hole, the liquid injection hole and the explosion-proof nick do not interfere with each other, a first through hole is further formed in the first plate body, a turnover disc is arranged in the first through hole, the turnover disc is of a concave structure on the first plate body, and the plate body, the turnover disc and the first groove-shaped boss are of a stamping integrated structure.
Further, first dish that converges includes disk body and electrically conductive handle, disk body lower extreme fixed connection to positive ear, the disk body is through the lower extreme of electrically conductive handle fixed connection to first plate body.
Furthermore, a second through hole and a third through hole are formed in the first insulating part, the inner diameter of the third through hole is larger than the outer diameter of the turnover disc, the third through hole and the first through hole are arranged concentrically, and the periphery of the first groove-shaped boss is located in the second through hole.
Further, the upper cover plate comprises a second groove-shaped boss arranged at the timely upper end of the second plate body, the outer edge of the second plate body is clamped to the inner ring at the upper end of the shell, the lower end of the second plate body is connected to the upper end of the lower cover plate through a sealing insulating piece in a contact mode, a fourth through hole is formed in the second plate body, the first groove-shaped boss is located in the fourth through hole, the upper end of the second groove-shaped boss is flush with the upper end of the first groove-shaped boss, a groove is formed in the lower end of the second groove-shaped structure, and the turnover disc is located in the groove.
Furthermore, a positioning column is installed at the bottom of the shell, a positioning hole is formed in the middle of the second confluence disc, and the periphery of the positioning column is located in the positioning hole.
Furthermore, the inner ring at the upper end of the shell is respectively provided with a first clamping table and a second clamping table which are annular, the first clamping table is positioned at the upper end of the second clamping table, the periphery of the confluence disc is fixedly installed between the second clamping table and the roll core, the periphery of the upper cover plate and the periphery of the lower cover plate are fixedly installed between the first clamping table and the second clamping table, and the sealing insulating pieces are positioned between the periphery of the confluence disc and the second clamping table and between the periphery of the lower cover plate and the inner ring of the shell.
Compared with the prior art, the high-safety high-magnification cylindrical battery has the following beneficial effects: the casing and negative pole or anodal converge the dish and directly link, do not do utmost point post processing on the casing, reduce cost, the heat can directly transmit the casing through converging the dish, improve heat transfer efficiency, adopt the double-deck design of upper cover plate and lower apron simultaneously, lower apron and positive pole or negative pole converge the dish welding electrically conductive, the upper cover plate compresses tightly the mode of apron through the roll slot turn-ups, on the electric conductance to the upper cover plate of cylinder casing, the cylinder rolls up the core and becomes positive negative pole at the homonymy, the production of being convenient for improves production efficiency.
Another objective of the present invention is to provide an assembly process for a high-safety high-rate cylindrical battery, so as to solve the problems of complicated structure, high manufacturing cost and low production efficiency of the cylindrical battery in the prior art.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
an assembly process of a high-safety high-magnification cylindrical battery comprises the following steps:
s1, respectively cutting the upper end of the positive plate and the lower end of the negative plate into tooth-shaped structures through laser;
s2, sequentially overlapping and winding the positive plate, the isolating film and the negative plate into a cylindrical winding core, shaping the tooth-shaped structure at the upper end of the positive plate into a positive lug, and shaping the tooth-shaped structure at the lower end of the negative plate into a negative lug;
s3, fixedly connecting the lower end of the first confluence disc to the positive electrode lug, fixedly connecting the upper end of the second confluence disc to the negative electrode lug, and positioning and installing the winding core into the shell through the second confluence disc by a worker;
s4, placing an insulating piece at the upper end of the first confluence disc, and then extruding the shell to the axis direction at the position of the inner ring at the upper end of the shell close to the insulating piece to form a second clamping table;
s5, fixedly connecting the lower end of the first confluence disc to the lower end of the lower cover plate, and butting the outer edge of the lower cover plate to the upper end of the second clamping table;
s6, placing a first insulating part and an upper cover plate at the upper end of the lower cover plate in sequence, and flanging the outer edge of the upper end of the shell to form a first clamping table which is a fixed structure of the upper cover plate and the lower cover plate.
Compared with the prior art, the assembly process of the high-safety high-magnification cylindrical battery has the following advantages: the battery assembly process is simple, the shell is directly connected and contacted with the bus disc at the bottom of the winding core, heat transfer is easy, and meanwhile, the small resistance is beneficial to the multiplying power performance of the winding core; in addition, through two upper and lower apron designs, the electricity of battery is guided to the homonymy, and the design and the connection of busbar when being convenient for constitute module or system improve the security performance simultaneously to design explosion-proof valve and tilting mechanism on the apron.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is an exploded view of a high-safety high-rate cylindrical battery according to an embodiment of the present invention;
fig. 2 is a schematic cross-sectional view of a high-safety high-magnification cylindrical battery according to an embodiment of the invention;
FIG. 3 is an enlarged view of a portion of FIG. 2;
FIG. 4 is a schematic view of a core structure according to an embodiment of the present invention;
fig. 5 is a schematic structural view of the positive plate according to the embodiment of the present invention;
FIG. 6 is a schematic view of a lower cover plate according to an embodiment of the present invention;
FIG. 7 is a schematic view of a first insulating member according to an embodiment of the present invention;
FIG. 8 is a schematic structural diagram of an upper cover plate according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a first bus tray according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of a second bus tray according to an embodiment of the present invention.
Description of reference numerals:
1-a shell; 11-a positioning post; 12-a first chuck table; 13-a second chuck; 2-a winding core; 21-a positive plate; 22-positive tab; 3-a first confluence disc; 31-a tray body; 32-a conductive handle; 4-a second confluence disc; 41-positioning holes; 5-lower cover plate; 51-a first plate body; 52-first groove-shaped boss; 53-liquid injection hole; 54-explosion-proof scoring; 55-turning over the disc; 6-a first insulator; 61-a second via; 62-a third via; 7-upper cover plate; 71-a second plate body; 72-a second groove-shaped boss; 73-fourth via; 8-sealing the insulator; 9-second insulator.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in fig. 1-10, a high-safety high-magnification cylindrical battery comprises a casing 1, a winding core 2 and a cover plate assembly, wherein the casing 1 is a barrel-shaped structure, the winding core 2 is fixedly mounted inside the casing 1 through the cover plate assembly, the cover plate assembly comprises an upper cover plate 7, a lower cover plate 5 and a sealing insulator 8, the periphery of the lower cover plate 5 is hermetically connected to the inner ring at the upper end of the casing 1 through the sealing insulator 8, the lower end of the winding core 2 is fixedly connected to the bottom of the casing 1 through a second bus disc 4, the upper end of the winding core 2 is fixedly connected to the lower end of the lower cover plate 5 through a first bus disc 3, the upper cover plate 7 is fixedly mounted at the upper end of the lower cover plate 5, the outer edge of the upper cover plate 7 is clamped to the inner ring at the upper end of the casing 1, a first insulator 6 is arranged between the upper cover plate 7 and the lower cover plate 5, the casing 1 is directly connected with a negative or positive bus disc, no pole post treatment is performed on the casing 1, so as to reduce the cost, simultaneously, heat can be directly transmitted to the shell 1 through the bus disc, heat transfer efficiency is improved, heat transfer design and assembly of a module or a system are facilitated, meanwhile, the double-layer design of the upper cover plate 7 and the lower cover plate 5 is adopted, the lower cover plate 5 is welded and conductive with the positive pole or the negative pole bus disc, the upper cover plate 7 compresses the cover plate through the flanging of the roller groove, the cylindrical shell 1 is conducted to the upper cover plate 7, the cylindrical battery is changed into the positive pole and the negative pole at the same side, and bus bar design and welding of the battery when the module or the system is formed are facilitated.
The winding core 2 comprises a positive plate 21, a negative plate and an isolating film, wherein the positive plate 21 and the negative plate are arranged in parallel, the isolating film is positioned between the positive plate 21 and the negative plate, the winding core 2 is a cylindrical structure formed by winding the positive plate 21, the negative plate and the isolating film after being stacked, a plurality of first bosses are arranged at the upper end of the positive plate 21, a positive lug 22 is formed after the first bosses are wound along with the positive plate 21, a plurality of second bosses are arranged at the lower end of the negative plate, a plurality of second bosses form negative lugs after the second bosses are wound along with the negative plate, the positive lug 22 is fixedly connected to the lower end of the first bus plate 3, the negative lug is fixedly connected to the upper end of the second bus plate 4, as shown in figure 5, a multi-lug structure is formed on the positive plate 21 and the negative plate through laser cutting or die cutting, according to the design size and the die cutting distance, the lug width and the lug distance are gradually increased from the inner part of the winding core 2 to the outer part of the winding core 2, the height of the pole ear can be the same or can be increased, the pole ear of the winding core 2 composed of the positive plate 21, the negative plate and the isolating film is bent and leveled to form the pole ear with a radial structure, the shape can have different numbers, the structure has stacked pole ears as shown in figure 5, a gap is left between the pole ears, the gap is convenient for the absorption of the electrolyte, the gap is used as the electrolyte absorption channel of the winding core 2, the electrolyte injection time is greatly shortened, the electrolyte injection efficiency is improved, the positive and negative pole plates have a multi-pole ear structure, and the electric conduction and heat conduction capability is improved compared with the single pole ear or 2 pole ear structure of the traditional cylindrical battery; meanwhile, a certain gap is formed among the multiple tabs, and gaps exist among the tabs after the tabs are shaped and become channels of electrolyte, so that the electrolyte absorption is facilitated compared with a full-tab kneading square mode.
A second insulating part 9 is arranged between the first confluence disc 3 and the lower cover plate 5, one end of the first confluence disc 3 is fixedly connected to the lower end of the lower cover plate 5 after passing through the second insulating part 9, the first confluence disc 3 and the second confluence disc 4 are respectively welded with two pole lugs of the winding core 2, the surfaces of the first confluence disc 3 and the second confluence disc 4 are uneven, the groove positions are matched with the shapes of the lugs of the winding core 2, the lugs are compressed for laser welding, the center positions are flanged towards the same side and are matched with the center hole position of the winding core 2 for positioning, as shown in figure 9, the first confluence disc 3 comprises a disc body 31 and a conductive handle 32, the lower end of the disc body 31 is fixedly connected to the positive lugs 22, the disc body 31 is fixedly connected to the lower end of the first plate body 51 through the conductive handle 32, the conductive handle 32 is provided with a raised reinforcing rib structure and notches for facilitating bending, the conductive handle 32 can be provided with a plurality of notches, as electrically conductive weak position, exceed certain electric current this position and take place the fusing, the core 2 is rolled up in the fusing disconnection when taking place outside short circuit and produce the heavy current improves the security, the second converges 4 dish that converges unsmooth in surface, the groove position matches with 2 utmost point ear shapes of book core, it is used for laser welding to compress tightly utmost point ear, the second converges 4 middle parts of dish and is equipped with locating hole 41, 1 bottom installation reference column 11 of casing, the second converges 4 middle parts of dish and is equipped with locating hole 41, 11 peripheries of reference column are located locating hole 41, the positioning action has been played, the equipment of being convenient for.
The lower cover plate 5 comprises a first plate body 51 and a first groove-shaped boss 52 arranged at the upper end of the first plate body 51, the outer edge of the first plate body 51 is connected to the inner ring at the upper end of the shell 1 in a sealing way through a sealing insulating part 8, the first groove-shaped boss 52 is respectively provided with a liquid injection hole 53 and an explosion-proof nick 54, a seal nail is arranged in the liquid injection hole 53, the liquid injection hole 53 and the explosion-proof nick 54 are not interfered with each other, the first plate body 51 is also provided with a first through hole, a turnover disc 55 is arranged in the first through hole, the turnover disc 55 is of a concave structure on the first plate body 51, the explosion-proof nick 54 is used as an explosion-proof valve, the internal pressure of the winding core 2 can be broken and released under the thermal runaway and other failure conditions, gas is generated in the winding core 2 under the overcharging or other abuse conditions, when the pressure reaches a fixed value, the turnover disc 55 is overturned from a bulge in the winding core 2 to an outward bulge, and then contacts with the upper cover plate 7 to discharge in a short circuit after the outward bulge, the energy of the winding core 2 is released to enable the winding core 2 to be in a safe charge state, or when overcharging, the external current flows away through a short circuit, the charge state of the winding core 2 cannot rise any more, so that the overcharge safety is improved, and the plate body, the turnover disc 55 and the first groove-shaped boss 52 are of a stamping integrated structure, so that the production efficiency is improved, and the manufacturing cost is reduced.
The first insulating part 6 is provided with a second through hole 61 and a third through hole 62, the inner diameter of the third through hole 62 is larger than the outer diameter of the turnover disc 55, the third through hole 62 and the first through hole are concentrically arranged, and the periphery of the first groove-shaped boss 52 is positioned in the second through hole 61.
The upper cover plate 7 comprises a second groove-shaped boss 72 arranged at the upper end of the second plate body 71 in time, the outer edge of the second plate body 71 is clamped to the inner ring at the upper end of the shell 1, the lower end of the second plate body 71 is connected to the upper end of the lower cover plate 5 through a sealing insulator 8 in a contact mode, a fourth through hole 73 is formed in the second plate body 71, the first groove-shaped boss 52 is located in the fourth through hole 73, the upper end of the second groove-shaped boss 72 is flush with the upper end of the first groove-shaped boss 52, a groove is formed in the lower end of the second groove-shaped structure, and the turnover disc 55 is located in the groove.
The bottom of the shell 1 is provided with a positioning column 11, the middle of the second confluence disc 4 is provided with a positioning hole 41, and the periphery of the positioning column 11 is positioned in the positioning hole 41.
The inner ring of the upper end of the shell 1 is respectively provided with a first clamping table 12 and a second clamping table 13 in an annular shape, the first clamping table 12 is positioned at the upper end of the second clamping table 13, the periphery of the confluence disc is fixedly arranged between the second clamping table 13 and the winding core 2, the periphery of the upper cover plate 7 and the periphery of the lower cover plate 5 are fixedly arranged between the first clamping table 12 and the second clamping table 13, the sealing insulating piece 8 is positioned between the periphery of the confluence disc and the second clamping table 13 and between the periphery of the lower cover plate 5 and the inner ring of the shell 1, the inner ring of the first clamping table 12 is in contact connection with the periphery of the second groove-shaped boss 72 so as to increase the contact area between the shell 1 and the second groove-shaped boss 72, meanwhile, the lower end of the second groove-shaped boss 72 is provided with a groove, the turnover disc 55 is positioned in the groove, and the groove provides a turnover space for the turnover disc 55.
An assembly process of a high-safety high-magnification cylindrical battery comprises the following steps:
s1, cutting the upper end of the positive plate 21 and the lower end of the negative plate into tooth-shaped structures by a worker through laser;
s2, the worker sequentially superimposes the positive plate 21, the isolation film and the negative plate and winds the positive plate, the isolation film and the negative plate into a cylindrical winding core 2, the electrode lugs are bent and guided in the winding process, all the electrode lugs are bent and inclined towards the center of the winding core 2, the tooth-shaped structure at the upper end of the positive plate 21 is shaped into the positive electrode lug 22, the tooth-shaped structure at the lower end of the negative plate is shaped into the negative electrode lug, and the shaping method is that the multiple electrode lugs on the winding core 2 are flattened and pressed into a planar state;
s3, fixedly connecting the lower end of the first current collecting disc 3 to the positive electrode lug 22 and fixedly connecting the upper end of the second current collecting disc 4 to the negative electrode lug by workers, and positioning and installing the winding core 2 into the shell 1 through the second current collecting disc 4 by the workers;
s4, placing a sealing insulating sheet on the first bus bar disc 3 on one side of the opening end of the shell 1 by a worker to prevent the first bus bar disc 3 from contacting with the shell 1 to cause short circuit, and extruding the shell 1 in the axial direction to form a second clamping table 13 at the position of an inner ring at the upper end of the shell 1 close to the first bus bar disc 3;
s5, fixedly welding the conductive handle 32 of the first confluence disc 3 to the lower end of the lower cover plate 5 by a worker, bending the conductive handle 32, covering the lower cover plate 5 on a platform on the upper edge of the roller groove, and attaching the lower cover plate 5 to the shell 1, wherein an insulating sealing element between the lower cover plate 5 and the shell 1 is preassembled on the lower cover plate 5, and the outer edge of the lower cover plate 5 abuts against the upper end of the second clamping table 13;
s6, sequentially placing the first insulating part 6 and the upper cover plate 7 at the upper end of the lower cover plate 5 by a worker, and flanging the outer edge of the upper end of the shell 1 to form a first clamping table 12, wherein the first clamping table 12 is a fixing structure of the upper cover plate 7 and the lower cover plate 5.
In order to improve the conductive capability of the shell 1 and the upper cover plate 7, the upper cover plate 7 and the first clamping platform 12 can be welded by laser welding, resistance welding, brazing and the like;
the battery assembly process is simple, the shell 1 is directly connected and contacted with the bus disc at the bottom of the winding core 2, heat transfer is easy, and meanwhile, the low resistance is beneficial to the multiplying power performance of the battery; in addition, through two upper and lower apron designs, the electricity of battery is guided to the homonymy, and the design and the connection of busbar when being convenient for constitute module or system improve the security performance simultaneously to design explosion-proof valve and tilting mechanism on the apron.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The utility model provides a high safe high magnification cylinder type battery which characterized in that: including casing (1), roll up core (2) and apron subassembly, casing (1) is the tubbiness structure, roll up core (2) through apron subassembly fixed mounting to casing (1) inside, the apron subassembly includes upper cover plate (7), lower cover plate (5) and sealed insulator (8), lower cover plate (5) periphery is through sealed insulator (8) sealing connection to casing (1) upper end inner circle, the lower extreme of rolling up core (2) converges dish (4) fixed connection to casing (1) bottom through the second, the upper end of rolling up core (2) is through the lower extreme of first dish (3) fixed connection to lower cover plate (5), the upper end fixed mounting upper cover plate (7) of lower cover plate (5), upper cover plate (7) outer fringe joint to casing (1) upper end inner circle, and set up first insulator (6) between upper cover plate (7) and lower cover plate (5).
2. The cylindrical battery of high safety and high rate according to claim 1, wherein: roll up core (2) and include positive plate (21), negative plate and barrier film, positive plate (21) and the mutual parallel arrangement of negative plate, and the barrier film is located between positive plate (21) and the negative plate, roll up core (2) and be positive plate (21), negative plate and barrier film superpose back coiling shaping's cylinder structure each other, the upper end of positive plate (21) sets up a plurality of first bosss, and a plurality of first bosss form anodal ear (22) along with positive plate (21) coiling back, the negative plate lower extreme sets up a plurality of second bosss, and a plurality of second bosss form the negative pole ear along with the negative plate coiling back, anodal ear (22) fixed connection is to the lower extreme of first dish (3) that converges, negative pole ear fixed connection is to the upper end of second dish (4) that converges.
3. The cylindrical battery of high safety and high rate according to claim 1, wherein: set up second insulator (9) between first dish (3) of converging and apron (5) down, and the one end of first dish (3) of converging passes second insulator (9) back fixed connection to the lower extreme of apron (5) down.
4. The cylindrical battery of high safety and high rate according to claim 1, wherein: lower cover plate (5) are including first plate body (51) and first cell type boss (52) that upper end set up, first plate body (51) outer fringe is through sealed insulating part (8) sealing connection to casing (1) upper end inner circle, be equipped with respectively on first cell type boss (52) and annotate liquid hole (53) and explosion-proof nick (54), install the staple in annotating liquid hole (53), and annotate liquid hole (53) and explosion-proof nick (54) mutually noninterfere, still be equipped with first through-hole on first plate body (51), set up upset disc (55) in the first through-hole, upset disc (55) are sunken type structure on first plate body (51), and the plate body, upset disc (55) and first cell type boss (52) are integrative punching press structure.
5. The high-safety high-rate cylindrical battery as defined in claim 3, wherein: the first bus bar (3) comprises a disc body (31) and a conductive handle (32), the lower end of the disc body (31) is fixedly connected to the positive lug (22), and the disc body (31) is fixedly connected to the lower end of the first plate body (51) through the conductive handle (32).
6. The high-safety high-rate cylindrical battery as defined in claim 4, wherein: the first insulating part (6) is provided with a second through hole (61) and a third through hole (62), the inner diameter of the third through hole (62) is larger than the outer diameter of the turnover disc (55), the third through hole (62) and the first through hole are arranged concentrically, and the periphery of the first groove-shaped boss (52) is positioned in the second through hole (61).
7. The cylindrical battery of high safety and high rate according to claim 6, wherein: the upper cover plate (7) comprises a second plate body (71) and a second groove-shaped boss (72) arranged at the upper end of the second plate body (71), the outer edge of the second plate body (71) is clamped to the inner ring at the upper end of the shell (1), the lower end of the second plate body (71) is connected to the upper end of the lower cover plate (5) through a sealing insulator (8) in a contact mode, a fourth through hole (73) is formed in the second plate body (71), the first groove-shaped boss (52) is located in the fourth through hole (73), the upper end of the second groove-shaped boss (72) is flush with the upper end of the first groove-shaped boss (52), a groove is formed in the lower end of the second groove-shaped structure, and the turnover disc (55) is located in the groove.
8. The cylindrical battery of high safety and high rate according to claim 1, wherein: the bottom of the shell (1) is provided with a positioning column (11), the middle of the second confluence disc (4) is provided with a positioning hole (41), and the periphery of the positioning column (11) is positioned in the positioning hole (41).
9. The cylindrical battery of high safety and high rate according to claim 1, wherein: the inner ring of the upper end of the shell (1) is respectively provided with a first clamping table (12) and a second clamping table (13), the first clamping table (12) is located at the upper end of the second clamping table (13), the periphery of the confluence disc is fixedly installed between the second clamping table (13) and the winding core (2), the upper cover plate (7) is peripheral, the lower cover plate (5) is fixedly installed between the first clamping table (12) and the second clamping table (13), and the sealing insulating piece (8) is located between the periphery of the confluence disc and the second clamping table (13) and between the periphery of the lower cover plate (5) and the inner ring of the shell (1).
10. The process for assembling a high-safety high-rate cylindrical battery as claimed in any one of claims 1 to 9, wherein: the method comprises the following steps:
s1, respectively cutting the upper end of the positive plate (21) and the lower end of the negative plate into tooth-shaped structures through laser;
s2, sequentially overlapping and winding the positive plate (21), the isolating film and the negative plate into a winding core (2) with a cylindrical structure, shaping the tooth-shaped structure at the upper end of the positive plate (21) into a positive lug (22), and shaping the tooth-shaped structure at the lower end of the negative plate into a negative lug;
s3, fixedly connecting the lower end of the first current collecting disc (3) to the positive electrode lug (22), fixedly connecting the upper end of the second current collecting disc (4) to the negative electrode lug, and positioning and installing the winding core (2) into the shell (1) through the second current collecting disc (4) by a worker;
s4, placing an insulating piece (9) at the upper end of the first confluence disc (3), and then extruding the shell (1) to the axial direction at the position of the inner ring at the upper end of the shell (1) close to the insulating piece (9) to form a second clamping table (13);
s5, fixedly connecting the upper end of the first confluence disc (3) to the lower end of the lower cover plate (5), and butting the outer edge of the lower cover plate (5) to the upper end of the second clamping table (13);
s6, placing a first insulating part (6) and an upper cover plate (7) at the upper end of the lower cover plate (5) in sequence, and flanging the outer edge of the upper end of the shell (1) to form a first clamping table (12), wherein the first clamping table (12) is a fixing structure of the upper cover plate (7) and the lower cover plate (5).
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| CN202210105841.3A CN114421001A (en) | 2022-01-28 | 2022-01-28 | High-safety high-magnification cylindrical battery and assembly process thereof |
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