CN114937855B - Preparation method of cylindrical battery and cylindrical battery - Google Patents
Preparation method of cylindrical battery and cylindrical battery Download PDFInfo
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- CN114937855B CN114937855B CN202210323767.2A CN202210323767A CN114937855B CN 114937855 B CN114937855 B CN 114937855B CN 202210323767 A CN202210323767 A CN 202210323767A CN 114937855 B CN114937855 B CN 114937855B
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- 238000002360 preparation method Methods 0.000 title claims abstract description 19
- 238000003466 welding Methods 0.000 claims description 59
- 239000000945 filler Substances 0.000 claims description 16
- 238000005520 cutting process Methods 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 13
- 229910052751 metal Inorganic materials 0.000 claims description 12
- 239000002184 metal Substances 0.000 claims description 12
- 238000004519 manufacturing process Methods 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 description 12
- 239000010959 steel Substances 0.000 description 12
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 10
- 229910052802 copper Inorganic materials 0.000 description 10
- 239000010949 copper Substances 0.000 description 10
- 210000004027 cell Anatomy 0.000 description 8
- 239000000853 adhesive Substances 0.000 description 4
- 230000001070 adhesive effect Effects 0.000 description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
- 238000004080 punching Methods 0.000 description 3
- 210000005056 cell body Anatomy 0.000 description 2
- YOCUPQPZWBBYIX-UHFFFAOYSA-N copper nickel Chemical compound [Ni].[Cu] YOCUPQPZWBBYIX-UHFFFAOYSA-N 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- YWXYYJSYQOXTPL-SLPGGIOYSA-N isosorbide mononitrate Chemical compound [O-][N+](=O)O[C@@H]1CO[C@@H]2[C@@H](O)CO[C@@H]21 YWXYYJSYQOXTPL-SLPGGIOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 229910000570 Cupronickel Inorganic materials 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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
- H01M50/531—Electrode connections inside a battery casing
- H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/107—Primary casings; Jackets or wrappings characterised by their shape or physical structure having curved cross-section, e.g. round or elliptic
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/116—Primary casings; Jackets or wrappings characterised by the material
- H01M50/117—Inorganic material
- H01M50/119—Metals
-
- 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
- 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
- H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Primary Cells (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The invention provides a preparation method of a cylindrical battery and the cylindrical battery, wherein an outer shell of an inner shell and an outer shell is prepared, a cylindrical electrode assembly is placed in the outer shell, and then the cylindrical electrode assembly is electrically connected with an electrode end of the electrode assembly through an electric flexible piece arranged in the outer shell.
Description
Technical Field
The invention relates to the technical field of power battery preparation, in particular to a preparation method of a cylindrical battery and the cylindrical battery.
Background
With the development of modern society and the enhancement of environmental awareness of people, more and more devices select lithium batteries as power sources, such as mobile phones, notebook computers, electric tools, electric automobiles and the like, which provides a wide space for the application and development of the lithium batteries. Among them, lithium batteries used in electric tools, electric vehicles, and the like are generally called power batteries.
In the current cylindrical full-tab power battery, the tab leading-out mode is as follows: firstly, rubbing the full lugs, then, respectively rubbing the positive and negative lugs with the positive and negative lugs to weld the positive and negative lugs, and welding the positive lugs with the positive poles through the positive connecting lugs and welding the negative connecting lugs with the inner wall of the steel shell, thereby realizing the extraction of the lugs.
However, the extraction method has the following problems:
1) The welding of the negative electrode connecting sheet and the inner wall of the steel shell is difficult, and the welding rate is low;
2) If the welding area of the negative electrode connecting sheet is arranged at the negative electrode end in the shell, a certain space is occupied, and the space utilization rate in the battery cell is reduced; the weld area of the negative electrode connecting sheet can cause poor air tightness of the pier seal at the pier seal opening;
3) The steel shell is used as a negative current path, the resistance is relatively large, and the power performance of the battery cell can be reduced.
Disclosure of Invention
One of the objects of the present invention is: the invention provides a preparation method of a cylindrical battery, and the cylindrical battery prepared by the preparation method can solve the problem that the welding of a negative electrode connecting sheet and the inner wall of a steel shell is difficult at present.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
A method for preparing a cylindrical battery, comprising the steps of:
Preparing a first cylindrical shell with at least one opening end, wherein the opening end is a first end, and a second end is arranged opposite to the opening end;
Preparing a cylindrical second shell with at least one opening end, and cutting the end of the opening end to leave at least one electric flexible piece or welding the electric flexible piece on the end of the opening end;
Extending the second housing into the first housing with the electrical flex disposed adjacent the first end;
Welding the end part of the second shell far away from the first end with the second end of the first shell and/or welding the first shell with the shell wall of the second shell to obtain a shell;
placing a cylindrical electrode assembly in the obtained shell, then electrically connecting an electrode terminal with a first electrode end of the electrode assembly, and folding the electric flexible piece towards the center of the cylinder to electrically connect the electric flexible piece with a second electrode end of the electrode assembly; wherein the electrode terminal is insulated from the case;
And sealing the opening of the first end to finish the preparation of the cylindrical battery.
Preferably, the electric flexible member is folded toward the center of the cylinder by 60 to 90 ° to be electrically connected to the second electrode terminal of the electrode assembly.
Preferably, openings are formed at two ends of the second housing, the ends of the two opening ends are cut respectively, at least one electric flexible member is reserved at two ends, the electric flexible member at one end is folded towards the center of the cylinder to form an end face, then the second housing extends into the first housing, and the electric flexible member at the other end is adjacent to the first end.
Preferably, the second housing is a metal plate which is punched or curled into a cylindrical shape.
Preferably, the end of the opening end of the second shell is mechanically die-cut or laser die-cut to form at least one electric flexible piece.
Preferably, the electrode assembly further comprises a notch cut at the folded portion of the electric flexible member, and then the electric flexible member is folded toward the center of the cylinder so as to be electrically connected to the second electrode terminal of the electrode assembly.
Preferably, the welding of the second housing and the first housing includes at least one of ultrasonic welding, laser welding, and resistance welding.
Preferably, the method further comprises the steps of coating a filler on the outer surface of the shell wall of the second shell, extending the second shell into the first shell, and heating to enable the filler to melt so as to tightly connect the first shell with the shell wall of the second shell.
Preferably, the method further comprises placing a filler between the first housing and the second housing at the end where the first end is located before sealing the first end opening.
Another object of the present invention is to provide a cylindrical battery, which is produced by the method for producing a cylindrical battery according to any one of the above.
Compared with the prior art, the invention has the beneficial effects that: according to the preparation method, firstly, the outer shell of the inner shell and the outer shell is prepared, then the cylindrical electrode assembly is placed in the outer shell, and then the cylindrical electrode assembly is electrically connected with the electrode end of the electrode assembly through the electric flexible part arranged in the outer shell, and the electric flexible part is arranged in the second shell (inner shell) and is easy to fold and weld, so that the purpose of leading out the electrode can be achieved without welding the connecting sheet with the inner wall of the steel shell, and the problem that the welding of the negative electrode connecting sheet and the inner wall of the steel shell is difficult in the conventional cylindrical battery is effectively solved.
Drawings
Fig. 1 is a schematic view of the structure of the cylindrical battery of the present invention before the casing electric flexible member is folded.
Fig. 2 is a schematic structural view of the cylindrical battery according to the present invention after the housing electric flexible member is folded.
Fig. 3 is a top view of the electrical flex of fig. 2 after folding.
Fig. 4 is a schematic structural view of the cylindrical battery of the present invention.
Fig. 5 is a schematic flow chart of the assembly of the cylindrical battery of the present invention.
Fig. 6 is a schematic cross-sectional view of a second housing in accordance with the first embodiment.
Fig. 7 is a schematic diagram of an end face of the second housing in the first embodiment.
Fig. 8 is a schematic structural view of a second case die-cut from a metal plate in the second embodiment.
Fig. 9 is a schematic diagram of an end face of the second housing in the second embodiment.
In the figure: 1-a housing; 11-a first housing; 12-a second housing; 13-an electrical flex; a 2-electrode assembly; 3-electrode terminals; 41-a first connecting piece; 42-second connecting piece.
Detailed Description
In order to make the technical scheme and advantages of the present invention more apparent, the present invention and its advantageous effects will be described in further detail below with reference to the detailed description and the accompanying drawings, but the embodiments of the present invention are not limited thereto.
In the description of the present invention, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the description of the present invention, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "secured" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Standard parts used in the invention can be purchased from the market, special-shaped parts can be customized according to the description of the specification and the drawings, the specific connection modes of all parts adopt conventional means such as mature bolts, rivets and welding in the prior art, the machinery, the parts and the equipment adopt conventional models in the prior art, and the circuit connection adopts conventional connection modes in the prior art, so that the details are not described.
The invention aims to provide a preparation method of a cylindrical battery, which can be shown in figures 1-5 and comprises the following steps:
1) Preparing a first shell 11 which is cylindrical and has at least one opening end, wherein the opening end is a first end, and a second end is arranged opposite to the opening end;
2) Preparing a second shell 12 which is cylindrical and has at least one opening end, cutting the end of the opening end to leave at least one electric flexible piece 13, or welding the electric flexible piece 13 to the end of the opening end;
3) Extending the second housing 12 into the first housing 11 with the electrical flex 13 disposed adjacent the first end;
4) Welding the end of the second housing 12 far from the first end with the second end of the first housing 11 and/or welding the first housing 11 with the wall of the second housing 12 to obtain a housing 1;
5) Placing a cylindrical electrode assembly 2 in the obtained case 1, then electrically connecting the electrode terminal 3 with the first electrode end of the electrode assembly 2, and folding the electric flexible member 13 toward the center of the cylinder so as to be electrically connected with the second electrode end of the electrode assembly 2; wherein the electrode terminal 3 is insulated from the case 1;
6) And sealing the opening of the first end to finish the preparation of the cylindrical battery.
Wherein, the steps 1) and 2) are not limited in preparation sequence, the first shell 11 can be prepared first and then the second shell 12 can be prepared, and the second shell 12 can be prepared first and then the first shell 11 can be prepared.
For the first housing 11, it may be prepared to have a thickness of 0.2 to 0.5mm. Since the present invention is a double-layered case, and the second case 12 also has a certain strength, the thickness of the first case 11 of the present invention may be set to be smaller than that of a conventional single-case cylindrical battery. For cylindrical production of the first housing 11, reference is made in particular to the present housing production, in particular also to the production by stamping or crimping.
Specifically, in some embodiments, one end of the first housing 11 is in a fully open state, so that the second housing 12 extends into the first housing 11 and exposes the electrical flexible member 13 of the second housing 12; the other end is punched with a first circular hole to facilitate the insertion of the subsequent electrode terminal 3.
For the second housing 12, it may be prepared to have a thickness of 0.05 to 0.2mm. Preferably, the thickness of the first housing 11 is greater than the thickness of the second housing 12. The first housing 11 is more advantageous to protect the entire cylindrical battery by being provided at the outermost layer with a housing having a larger thickness.
In some embodiments, the second housing 12 is a metal plate, which may be a steel sheet, a nickel-plated steel sheet, a copper sheet, or a nickel-plated copper sheet, and is stamped into a cylindrical shape; preferably, a material with good electric conductivity, such as a copper sheet or a nickel-plated copper sheet, is adopted to improve the power performance of the battery cell. The cylinder may be a cylinder with one end closed and one end open, and the end of the open end is die-cut to leave at least one electric flexible member 13; in particular, the die cutting may be mechanical die cutting or laser die cutting. Then punching a second round hole on the closed end at the position corresponding to the first round hole, as shown in figures 6-7; the diameter of the second circular hole is preferably larger than that of the first circular hole, so that the electrode terminal 3 is electrically connected with an electrode terminal of the electrode assembly 2 after passing through the first and second circular holes, respectively. Further, in some embodiments, the second housing 12 and the first housing 11 are welded at the end where the circular hole is provided to make electrical connection therebetween, and the welding includes at least one of ultrasonic welding, laser welding, and resistance welding. In other embodiments, the second housing 12 is closely attached to the end of the first housing 11 where the round hole is provided, and the first housing 11 and the housing wall of the second housing 12 are welded to achieve electrical connection therebetween, where the welding includes at least one of ultrasonic welding, laser welding, and resistance welding.
The battery cell with the two ends out of the lugs can be changed into a battery with one end out of the lugs by the obtained cylindrical battery in a mode that the end faces of the two shells provided with the round holes are welded, so that the design and welding of the external bus bar are facilitated, the application range is wider, and the utilization rate is higher. In this way, since the whole shell wall of the first shell 11 is not required to conduct electricity, the shell wall part of the first shell 11 is not required to be limited to a material with very good conductivity, even if the shell wall part is made of conventional steel or nickel-plated steel material, the problem that the power of the battery core is not affected due to the large resistance is solved, and the corresponding second shell 12 can be made of copper or copper-nickel material with good conductivity, so that the production cost can be saved more effectively.
In some embodiments, the second housing 12 is a metal sheet rolled into a cylindrical shape, and the metal sheet may be a steel sheet, a nickel-plated steel sheet, a copper sheet, or a nickel-plated copper sheet; preferably, the conductive electrode is made of a good material, such as copper sheet or nickel-plated copper sheet, so as to improve the power performance of the battery cell. The cylinder may be a cylinder with two open ends, and the metal plates at the two ends may be die-cut after being curled into a cylinder to form at least one electric flexible member 13, or the metal plates may be curled into a cylinder after die-cut at the two ends of the metal plates to form the electric flexible member 13, as shown in fig. 8 to 9. In particular, the die cutting may be mechanical die cutting or laser die cutting.
For the second shell 12 with the electric flexible parts 13 arranged at two ends, the electric flexible part 13 at one end is folded towards the center of the cylinder to form an end face, then the second shell 12 is stretched into the first shell 11, the folded end face is pressed with the end face of the second end of the first shell 11, then the two end faces are welded to enable the first shell 11 to be electrically connected with the second shell 12, and the welding comprises at least one of ultrasonic welding, laser welding and resistance welding. And the other end of the unfolded electric flexible member 13 is arranged adjacent to the first end, and after the electrode assembly 2 is put into the shell, the unfolded electric flexible member 13 is folded towards the center of the cylinder by 60-90 degrees to be electrically connected with the second electrode end of the electrode assembly 2, wherein the electrical connection comprises ultrasonic welding, laser welding or resistance welding. Preferably, the folding angle is 90 degrees, the electric connection can be vertical laser welding or ultrasonic welding, and the welding is simpler and more convenient. In some embodiments, the electrode connecting piece and the electric flexible piece 13 are tightly attached to the end face of the main body of the battery cell after being folded for 90 degrees and then welded with the electrode connecting piece; in other embodiments, the electrode assembly 2 is folded by 90 ° and then electrically connected with the tab, i.e. the electric flexible member 13 is directly attached to the end face of the main body of the electric core.
Compared with the conventional single-shell cylindrical battery, the cylindrical battery prepared by the preparation method provided by the invention has the advantages that the negative electrode tab and the shell are welded through the negative electrode connecting sheet to achieve the purpose of electric connection, the negative electrode connecting sheet has larger bending height and occupies more space in the height direction of the battery core, and the battery prepared by the preparation method provided by the invention has the advantages that both the negative electrode connecting sheet and the electric flexible piece 13 are tightly attached to the end face of the main body of the battery core, the occupied space is less, so that the space utilization rate of the battery core is higher, and the volume energy density of the battery core is higher.
For the electric flexible member 13, the electric flexible member 13 may be any one of rectangle, square, and arc. Preferably, the electric flexible member 13 is rectangular, and the long electric flexible member 13 is easier to fold.
In some embodiments, the length of the non-folded front edge of the electric flexible piece 13 in the tab-out direction is 10-18 mm. The length should ensure that at least a portion is exposed outside the first housing 11, so that the manipulator can better grasp and fold through the exposed electric flexible member 13 during folding, which is simpler in process and can be shown in fig. 5.
Preferably, the electric flexible parts 13 are provided in a plurality, and projections which are not folded and are along the direction of the tab are not overlapped. Preferably, the width of each of the electric flexible pieces 13 is 5 to 10mm. By providing a plurality of electric flexible members 13 for folding, the welding with one electrode terminal can be made more compact. Specifically, two, three, four, five electric flexible members 13 may be provided, and the greater the number of provided electric flexible members, the smaller the width thereof. More preferably, after folding, the projections of the electric flexible member 13 along the tab-out direction are not overlapped, as shown in fig. 1 to 3.
In some embodiments, it further comprises cutting a notch at the fold of the electro-flex 13, and then folding the electro-flex 13 toward the center of the cylinder to electrically connect with the second electrode end of the electrode assembly 2. The folding position of the electric flexible piece 13 can be limited through the arrangement of the notch, so that the electric flexible piece is more convenient to fold, and the consistency of the electric flexible piece to the cylindrical battery is higher.
In some embodiments, the method further comprises applying a filler to the outer surface of the wall of the second housing 12, inserting the second housing 12 into the first housing 11, and heating to melt the filler to tightly connect the first housing 11 and the wall of the second housing 12. The setting of filler can strengthen the rigidity intensity of casing on the one hand, also can provide the buffer protection layer for second casing 12, reduces the atress of second casing 12, on the other hand can further guarantee that electric flexible piece 13 and connection piece are hugged closely in the tip of electric core main part, further promotes the space utilization of electric core. The filler can be at least one of cured resin, structural adhesive and heat-conducting adhesive.
In some embodiments, the method further comprises placing a filler between the first housing 11 and the second housing 12 at the end where the first end is located before sealing the first end opening. The filler can be at least one of cured resin, structural adhesive and heat-conducting adhesive.
The first specific implementation mode of the preparation method of the cylindrical battery is as follows:
1) Preparing a first cylindrical shell 11 with one end open, wherein the open end is a first end, a second end opposite to the open end is arranged, and a first round hole is punched in the second end;
2) Punching a metal plate to form a cylinder with one end closed and one end open, and punching a second round hole at a position of the closed end corresponding to the first round hole, wherein the diameter of the second round hole is larger than that of the first round hole, and the diameter of the second round hole can be determined according to the shape of the electrode terminal 3; a plurality of electric flexible pieces 13 are die-cut at the end part of the opening end by laser, and a second shell 12 can be obtained as shown in figures 6-7; preferably, the outer surface of the die-cut second housing 12 shell wall is coated with a filler;
3) The second shell 12 is stretched into the first shell 11, the first round hole and the second round hole are correspondingly arranged, the end faces of the first shell 11 and the second shell 12 at the end are pressed by a die (the die can be heated to melt the filler), meanwhile, the second shell 12 and the shell wall of the first shell 11 are pressed to be well adhered, and the die-cut electric flexible piece 13 is arranged close to the first end;
4) Welding the end surfaces containing the round holes by adopting a laser welding/ultrasonic welding/resistance welding mode to obtain a shell 1;
5) Placing the prepared cylindrical electrode assembly 2 (which can be a flat full-tab electrode assembly or a die-cut multi-tab electrode assembly) in the obtained housing 1, then electrically connecting an electrode terminal 3 (which can be insulating for the housing 1) with the positive electrode end of the electrode assembly 2 (spot welding can be performed through a positive electrode connecting sheet), folding the electric flexible member 13 by 90 degrees towards the center of the cylinder to be adhered to and electrically connected with the negative electrode end of the electrode assembly 2 (adhering and welding can be performed through a negative electrode connecting sheet);
6) The shell 1 is subjected to rolling groove, and the opening at the first end is blocked by the cover plate, so that the preparation of the cylindrical battery is completed.
The second specific embodiment of the preparation method of the cylindrical battery is as follows:
1) Preparing a first cylindrical shell 11 with one end open, wherein the open end is a first end, a second end opposite to the open end is arranged, and a first round hole is punched in the second end;
2) Die cutting (mechanical die cutting or laser die cutting) is carried out on two ends of a sheet metal to form a plurality of electric flexible pieces 13 at the two ends respectively; curling the die-cut metal plate to form a cylinder with two open ends; then, the electric flexible piece 13 at one end is folded towards the center of the cylinder by 90 degrees to form an end face, and a second round hole is formed at the position corresponding to the first round hole on the end face, so that a second shell 12 can be obtained as shown in figures 8-9; preferably, the outer surface of the die-cut second housing 12 shell wall is coated with a filler;
3) The second shell 12 is stretched into the first shell 11, the first round hole and the second round hole are correspondingly arranged, the end faces of the first shell 11 and the second shell 12 at the end are pressed by a die (the die can be heated to melt the filler), meanwhile, the second shell 12 and the shell wall of the first shell 11 are pressed to be well adhered, and the die-cut electric flexible piece 13 is arranged close to the first end;
4) Welding the end surfaces containing the round holes by adopting a laser welding/ultrasonic welding/resistance welding mode to obtain a shell 1;
5) Placing the prepared cylindrical electrode assembly 2 (which can be a flat full-tab electrode assembly or a die-cut multi-tab electrode assembly) in the obtained housing 1, then electrically connecting an electrode terminal 3 (which can be insulating for the housing 1) with the positive electrode end of the electrode assembly 2 (spot welding can be performed through a positive electrode connecting sheet), folding the electric flexible member 13 by 90 degrees towards the center of the cylinder to be adhered to and electrically connected with the negative electrode end of the electrode assembly 2 (adhering and welding can be performed through a negative electrode connecting sheet);
6) The shell 1 is subjected to rolling groove, and the opening at the first end is blocked by the cover plate, so that the preparation of the cylindrical battery is completed.
The cylindrical battery prepared by the two methods has the following structure: comprises a shell 1, an electrode assembly 2, an electrode terminal 3 and a connecting sheet; wherein the electrode assembly 2 is accommodated in the housing 1, one electrode end of the electrode assembly 2 is electrically connected with the electrode terminal 3 through a connecting sheet, and the other electrode end is electrically connected with the housing 1 through another connecting sheet; the electrode terminal 3 is provided at one end of the case 1 and is provided to be insulated from the case 1.
The electrode assembly 2 includes a cell body and first and second tabs extending along both ends of the cell body, respectively. The electrode lugs can be full electrode lugs, are arranged at two ends of the battery cell main body after being kneaded, and the kneading plane is electrically connected with the connecting sheet. The tabs may also be multipolar tabs, with like tabs electrically connected to each other to tabs through which the electrodes are led out. Wherein the electrical connection may be a weld, including ultrasonic, laser, or resistance welding. The battery cell main body comprises a positive pole piece, a negative pole piece and a diaphragm which is arranged between the positive pole piece and the negative pole piece at intervals, and can be manufactured by winding or lamination. The positive electrode tab is led out from the positive electrode sheet and can be made of aluminum foil; and the negative electrode tab led out from the negative electrode plate can be made of copper foil or nickel-to-copper. Specifically, the first tab may be a positive tab or a negative tab, and the second tab may be a negative tab or a positive tab. Preferably, the first tab may be a positive tab, and the second tab may be a negative tab.
And the connection pieces include a first connection piece 41 electrically connected to the first tab and a second connection piece 42 electrically connected to the second tab, the first connection piece 41 being electrically connected to the electrode terminal 3, the second connection piece 42 being electrically connected to the case. For example, when the first tab is a positive tab and the second tab is a negative tab, the first connection piece 41 is a positive connection piece, and the second connection piece 42 is a negative connection piece, that is, the electrode terminal 3 is electrically connected to the positive connection piece, and the positive connection piece is electrically connected to the positive tab, so that the positive electrode is led out; the shell is electrically connected with the negative electrode connecting sheet, and the negative electrode connecting sheet is electrically connected with the negative electrode tab, so that the negative electrode is led out.
The shell 1 comprises a first shell 11 and a second shell 12, wherein the projection of the second shell 12 is contained in the projection of the first shell 11 along the direction of a tab, one end of the second shell 12 is welded with one end of the first shell 11, and the other end of the second shell 12 is provided with a plurality of electric flexible pieces 13; the electric flexible member 13 is folded toward the center of the cylinder for electrical connection with the connection tab or tab.
Variations and modifications of the above embodiments will occur to those skilled in the art to which the invention pertains from the foregoing disclosure and teachings. Therefore, the present invention is not limited to the above-described embodiments, but is intended to be capable of modification, substitution or variation in light thereof, which will be apparent to those skilled in the art in light of the present teachings. In addition, although specific terms are used in the present specification, these terms are for convenience of description only and do not limit the present invention in any way.
Claims (10)
1. A method for preparing a cylindrical battery, comprising the steps of:
Preparing a first cylindrical shell with at least one opening end, wherein the opening end is a first end, and the second end is opposite to the opening end;
Preparing a cylindrical second shell with at least one open end, cutting the end of the open end to leave at least one electric flexible piece, or welding the electric flexible piece on the end of the open end;
Extending the second housing into the first housing with the electrical flex disposed adjacent the first end;
Welding the end part of the second shell far away from the first end with the second end of the first shell and/or welding the first shell with the shell wall of the second shell to obtain a shell;
placing a cylindrical electrode assembly in the obtained housing, then electrically connecting an electrode terminal with a first electrode end of the electrode assembly, and folding the electric flexible member toward the center of the cylinder to electrically connect with a second electrode end of the electrode assembly; wherein the electrode terminal is insulated from the case;
And sealing the opening of the first end to finish the preparation of the cylindrical battery.
2. The method for manufacturing a cylindrical battery according to claim 1, wherein the electric flexible member is folded toward the center of the cylinder by 60 to 90 ° to be electrically connected to the second electrode terminal of the electrode assembly.
3. The method for manufacturing a cylindrical battery according to claim 1 or 2, wherein openings are formed at both ends of the second housing, ends of both open ends are cut, at least one electric flexible member is left at both ends, the electric flexible member at one end is folded toward the center of the cylinder to form an end face, the second housing is then extended into the first housing, and the electric flexible member at the other end is disposed adjacent to the first end.
4. The method of manufacturing a cylindrical battery according to claim 1 or 2, wherein the second case is a metal plate material punched or rolled into a cylindrical shape.
5. The method of claim 4, wherein the end of the open end of the second housing is mechanically die-cut or laser die-cut to form at least one electrical flexible member.
6. The method of manufacturing a cylindrical battery according to claim 1 or 2, further comprising cutting a notch at the folded portion of the electric flexible member, and then folding the electric flexible member toward the center of the cylinder so as to be electrically connected to the second electrode terminal of the electrode assembly.
7. The method of manufacturing a cylindrical battery according to claim 1, wherein the welding of the second case and the first case includes at least one of ultrasonic welding, laser welding, and resistance welding.
8. The method of claim 1, further comprising coating a filler on an outer surface of a wall of the second case, extending the second case into the first case, and heating to melt the filler to tightly connect the first case and the wall of the second case.
9. The method of claim 1, further comprising placing a filler between the first housing and the second housing at an end where the first end is located before sealing the first end opening.
10. A cylindrical battery, characterized by being produced by the production method of a cylindrical battery according to any one of claims 1 to 9.
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Address after: 215500 No. 68, Xin'anjiang Road, Southeast street, Changshu, Suzhou, Jiangsu Patentee after: Jiangsu Zhengli New Energy Battery Technology Co.,Ltd. Country or region after: China Address before: 215500 No. 68, Xin'anjiang Road, Southeast street, Changshu, Suzhou, Jiangsu Patentee before: Jiangsu Zenergy Battery Technologies Co.,ltd Country or region before: China |