CN112207438A - Welding assembly and welding method - Google Patents
Welding assembly and welding method Download PDFInfo
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- CN112207438A CN112207438A CN202011069620.2A CN202011069620A CN112207438A CN 112207438 A CN112207438 A CN 112207438A CN 202011069620 A CN202011069620 A CN 202011069620A CN 112207438 A CN112207438 A CN 112207438A
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- 238000003466 welding Methods 0.000 title claims abstract description 306
- 238000000034 method Methods 0.000 title claims abstract description 56
- 239000007788 liquid Substances 0.000 claims abstract description 182
- 238000007789 sealing Methods 0.000 claims abstract description 167
- 238000002347 injection Methods 0.000 claims abstract description 150
- 239000007924 injection Substances 0.000 claims abstract description 150
- 238000003825 pressing Methods 0.000 claims abstract description 42
- 230000035515 penetration Effects 0.000 claims description 10
- 239000011324 bead Substances 0.000 claims description 5
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 239000000155 melt Substances 0.000 claims description 3
- 239000000945 filler Substances 0.000 claims 2
- 230000008569 process Effects 0.000 description 21
- 239000000243 solution Substances 0.000 description 7
- 230000007547 defect Effects 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000012994 industrial processing Methods 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 210000003371 toe Anatomy 0.000 description 2
- 230000003993 interaction Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/20—Bonding
- B23K26/21—Bonding by welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/70—Auxiliary operations or equipment
- B23K26/702—Auxiliary equipment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted for a procedure covered by only one of the other main groups of this subclass
- B23K37/04—Auxiliary devices or processes, not specially adapted for a procedure covered by only one of the other main groups of this subclass for holding or positioning work
- B23K37/0426—Fixtures for other work
- B23K37/0435—Clamps
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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
- H01M10/04—Construction or manufacture in general
- H01M10/0404—Machines for assembling batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M6/00—Primary cells; Manufacture thereof
- H01M6/005—Devices for making primary cells
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mechanical Engineering (AREA)
- Plasma & Fusion (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Sealing Battery Cases Or Jackets (AREA)
- Filling, Topping-Up Batteries (AREA)
Abstract
The invention provides a welding assembly and a welding method, the welding assembly is used for welding a battery shell with a liquid injection hole and a liquid injection hole sealing nail, and comprises a welding part and a pressing part, wherein the pressing part is abutted against the surface of the liquid injection hole sealing nail so as to press the liquid injection hole sealing nail on the battery shell and cover the liquid injection hole on the battery shell; the piece that compresses tightly is the loop configuration, and the inside that compresses tightly has the annular chamber, and the sealed nail of notes liquid hole of the welding end orientation annular intracavity of welding to will annotate the sealed nail welding of liquid hole on battery case. The welding method provided by the invention comprises the following steps of firstly, placing a liquid injection hole sealing nail at a liquid injection hole of a battery shell; then the pressing piece is abutted against the surface of the sealing nail of the liquid injection hole; and finally, welding the welding end of the welding part towards the liquid injection hole sealing nail in the annular cavity, and welding the liquid injection hole sealing nail and the battery shell. The method can improve the welding beat of the sealing nail in the closed liquid injection button battery, improve the welding yield and improve the product quality.
Description
Technical Field
The invention relates to the field of battery processing and manufacturing, in particular to a welding assembly and a welding method.
Background
Button cells have the advantage of small size, and are therefore widely used in various miniature electronic products.
Current button cell shell is stainless steel material, and one side is equipped with the circular apron of stainless steel, and the liquid is annotated to the mouth that closes is one of the important mode for button cell pours into electrolyte into, opens the notes liquid hole promptly in the circular apron of battery structure to accomplish the step of pouring into electrolyte after the apron welded seal, annotate the liquid completion back, need weld on the apron and annotate the sealed nail of liquid hole, in order to avoid appearing the battery weeping phenomenon. At the present stage, the technological process for welding the sealing nail of the liquid injection hole comprises the following steps: and placing the sealing nail of the liquid injection hole on the cover plate, then pressing the sealing nail on the cover plate by using the clamping jaws, dotting and prewelding, then removing the clamping jaws, and finally performing circumferential welding on the sealing nail.
However, the conventional operation mode of performing spot pre-welding and then performing full-welding is complex in flow, so that the welding beat is slow. And when dotting prewelding, the sealing nail and the circular cover plate are easily penetrated simultaneously, so that the problem of poor sealing performance of the button battery is caused, and the product quality is influenced.
Disclosure of Invention
In order to solve at least one problem mentioned in the background art, the invention provides a welding assembly and a welding method, which are used for welding a battery shell with a liquid injection hole and a liquid injection hole sealing nail, so that the welding process of the liquid injection hole sealing nail is simplified, the welding beat is improved, point tack welding is not needed in the welding process, the welding defect of the sealing nail caused by the point tack welding in the prior art is avoided, the welding yield is improved, and the product quality is improved.
In order to achieve the above object, in a first aspect, the present invention provides a welding assembly including a welding member and a pressing member for welding a battery case having a pour hole and a pour hole sealing nail. The pressing piece is abutted against the surface of the liquid injection hole sealing nail so as to press the liquid injection hole sealing nail on the battery shell and cover the liquid injection hole on the battery shell; the piece that compresses tightly is the loop configuration, and the inside that compresses tightly has the annular chamber, and the sealed nail of notes liquid hole of the welding end orientation annular intracavity of welding to will annotate the sealed nail welding of liquid hole on battery case.
According to the welding assembly provided by the invention, after the liquid injection hole sealing nail to be welded and the battery shell are positioned before welding, the position relation between the liquid injection hole sealing nail to be welded and the battery shell is determined, and the pressing piece is abutted against the liquid injection hole sealing nail to be welded to provide certain pressure for the surface of the liquid injection hole sealing nail to be welded so as to press the liquid injection hole sealing nail to be welded on the battery shell, so that the position relation between the liquid injection hole sealing nail to be welded and the battery shell is kept unchanged in the subsequent welding working process. Meanwhile, the pressing piece is designed to be of an annular structure, the annular cavity is arranged in the pressing piece, the annular cavity is provided with a certain projection surface in the horizontal plane direction of the surface of the to-be-welded liquid injection hole sealing nail, in the subsequent welding process, the welding piece works on the contact position of the projection surface and the battery shell to realize the welding between the to-be-welded liquid injection hole sealing nail and the battery shell, and at the moment, the pressing piece also plays a role in positioning the welding piece.
In the above-described welding assembly, the annular chamber may be provided coaxially with the pour hole of the battery case.
After the welding can be guaranteed to be completed through the arrangement, the sealing nail can effectively seal the liquid injection hole.
In the welding assembly described above, optionally, the internal diameter of the annular cavity of the hold-down member is greater than 2 mm; and/or the wall thickness of the annular pressing piece is more than 0.2 mm.
Set up the internal diameter that compresses tightly a ring chamber and be greater than 2mm and can ensure to annotate and leave sufficient clearance between the profile of the plane of projection of the ring chamber on the surface of liquid hole sealed nail and the profile of annotating the liquid hole, guarantee that follow-up product that obtains after welding can satisfy the requirement of annotating liquid hole leakproofness, when the ring chamber internal diameter is less than or equal to 2mm, the clearance is less between the profile of the plane of projection of the ring chamber on the surface of annotating the liquid hole sealed nail and the profile of annotating the liquid hole, can't satisfy subsequent welding demand, reduce the sealing performance of annotating liquid hole sealed nail to annotating the liquid hole, the wall thickness that sets up to compress tightly the piece is greater than 0.2mm and can ensure to compress tightly the mechanical strength of piece, avoid simultaneously because compress tightly a strength inad.
In the welding assembly, optionally, the welding part is a laser welding part, a laser emitter is arranged at the welding end of the welding part, and a laser beam emitted by the laser emitter faces the liquid injection hole sealing nail in the annular cavity.
Laser welding has the characteristics that energy density is high, heating is concentrated, can realize the high-speed joint of sheet metal, and the laser beam that laser emitter sent is towards annotating the liquid hole seal nail in the annular chamber, ensures to annotate the correct welding between liquid hole seal nail and the battery case.
In the welding assembly, the welding part is optionally a pulse welding part, and the welding joint overlapping rate of the welding joint formed by the welding part is more than 50%. Or, the weldment is a continuous weldment.
The welding assembly provided by the invention can adapt to laser welding pieces with different light emitting frequencies and respectively adopts a pulse welding mode or a continuous welding mode, when the pulse welding mode is adopted, the sealing performance of the liquid injection hole sealing nail to the liquid injection hole can be ensured by the welding point overlapping rate of more than 50%, and when the welding point overlapping rate is less than or equal to 50%, the sealing performance of the liquid injection hole sealing nail to the liquid injection hole is poor, so that the phenomena of battery leakage and the like are caused; in addition, the welding mode of the welding part can also be continuous welding, the welding mode can obtain even and smooth welding seams, and the subsequent grinding or polishing treatment of the welding seams is not needed.
In a second aspect, the present invention provides a welding method comprising:
and placing the liquid injection hole sealing nail at the liquid injection hole of the battery shell and covering the liquid injection hole.
The pressing piece is abutted against the surface of the liquid injection hole sealing nail so as to press the liquid injection hole sealing nail on the battery shell; wherein, compressing tightly the piece and be the annular structure, compressing tightly the inside annular chamber that has of piece.
And (3) welding the welding end of the welding part towards the liquid injection hole sealing nail in the annular cavity, and welding the liquid injection hole sealing nail and the battery shell.
The welding method provided by the invention is characterized in that before welding, the liquid injection hole sealing nail to be welded is placed at the liquid injection hole of the battery shell and covers the liquid injection hole, the liquid injection hole sealing nail and the liquid injection hole are coaxially placed at the moment, after the position relation between the liquid injection hole sealing nail and the liquid injection hole is determined, the pressing piece is abutted against the surface of the liquid injection hole sealing nail, and the pressing piece provides certain pressure for the surface of the liquid injection hole sealing nail, so that the position relation between the liquid injection hole sealing nail and the battery shell is kept unchanged in the welding process. The pressing piece is of an annular structure, and an annular cavity is formed inside the pressing piece. During welding, the welding end of the welding part faces the liquid injection hole internal sealing nail in the annular cavity, the annular cavity has a certain projection surface in the horizontal plane direction of the surface of the liquid injection hole internal sealing nail to be welded, and the welding part operates on the contact position of the projection surface and the battery shell so as to realize welding between the liquid injection hole internal sealing nail to be welded and the battery shell.
In the welding method, optionally, the step of welding the pour hole sealing nail and the battery case by facing the welding end of the welding part to the pour hole sealing nail in the annular cavity specifically includes:
the laser of the welding part melts at least part of the liquid injection hole sealing nail in the annular cavity, and the at least part of the liquid injection hole sealing nail is embedded into the battery shell.
A weld is formed on the surface of the liquid injection hole sealing nail far away from the battery shell and at the joint between the liquid injection hole sealing nail and the battery shell.
The method can ensure that the liquid injection hole sealing nail and the battery shell can be tightly connected.
In the above welding method, optionally, the weld of the surface of the pour hole sealing nail remote from the battery case forms an annular locus on the surface of the pour hole sealing nail.
The center of the annular track and the center of the annular cavity are coaxially arranged, the inner diameter of the annular track is larger than the diameter of the liquid injection hole, and the outer diameter of the annular track is smaller than the inner diameter of the annular cavity.
After the welding is finished, the welding seam of the annular track corresponds to the shape of the liquid injection hole, in order to guarantee welding strength, the welding seam has a certain width, the projection of the welding seam in the horizontal direction on the battery shell does not overlap with the liquid injection hole, and the effect that the liquid injection hole sealing nail can play a role in sealing the liquid injection hole after the welding is guaranteed. The center of circular orbit with the coaxial setting in center of annular chamber, compress tightly the piece this moment and play the effect for welding a location, the working process of welding is full weld, treats that the welding process is accomplished the back, moves away and compresses tightly the piece, improves among the prior art and need carry out spot welding to sealed nail earlier, and the welding step of back circumference welding has promoted the welding beat, has avoided the welding defect that appears easily among the laser spot welding simultaneously, promotes the welding yield.
In the welding method, the welding seam of the surface of the liquid injection hole sealing nail far away from the battery shell is optionally in any one or more of a point shape, a linear shape, a spiral shape or a sine shape.
The penetration of the welding seam is more than 0.05 mm.
And/or the weld bead has a weld width greater than 0.25 mm.
When the sealing nail of the liquid injection hole is welded, the shape of the welding line can be designed into different shapes according to different processing requirements of users.
According to the welding method provided by the invention, the penetration of the welding seam is the depth of the welded liquid injection hole sealing nail embedded into the battery shell and forming at least part of the welding seam; the weld width is the distance between the two weld toes of the weld, i.e., the width of the weld. The penetration of the welding seam is set to be larger than 0.05mm, and the penetration of the welding seam is larger than 0.25mm so as to ensure the welding tightness between the liquid injection hole sealing nail and the battery shell. When the penetration of the welding line is less than or equal to 0.05mm or the fusion width of the welding line is less than or equal to 0.25mm, the welding strength is low, and the sealing performance of the liquid injection hole sealing nail on the liquid injection hole is poor, so that the phenomena of battery leakage and the like occur.
In the above welding method, optionally, the surface of the weld bead has a welding projection, and the height of the welding projection is less than or equal to 100 μm.
When the height of the welding bulge is larger than 100 micrometers, the welding bulge on the surface of the liquid injection hole sealing nail is too large, so that the machined button battery is not in accordance with the industrial processing standard, and the subsequent working performance of the button battery is influenced.
The summary of the invention and its objects and advantages will be more apparent from the description of the preferred embodiments taken in conjunction with the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a front view of a welding assembly provided by an embodiment of the present invention;
FIG. 2 is a top view of a welding assembly provided by an embodiment of the present invention;
FIG. 3 is a schematic diagram of a compression member of a welding assembly according to an embodiment of the present invention;
FIG. 4 is a schematic view of a weld shape after welding is completed by the welding method according to the embodiment of the invention;
FIG. 5 is a schematic view of a weld structure after welding is completed by the welding method according to the embodiment of the invention;
FIG. 6 is a schematic partial structure diagram of a portion I in FIG. 5 according to an embodiment of the present invention;
FIG. 7 is a schematic flow chart of a welding method according to an embodiment of the present invention;
fig. 8 is a schematic flow chart illustrating the formation of a weld joint by welding the pour hole sealing nail and the battery case according to the welding method provided by the embodiment of the invention.
Description of reference numerals:
1-sealing nail of liquid injection hole;
2-a pressing piece;
21-ring cavity;
3-a battery case;
4-welding seams;
41-welding a bump;
5-liquid injection hole;
6-welding parts.
Detailed Description
In the existing stage, in the method for welding the sealing nail for the button battery with closed liquid injection, the sealing nail with the liquid injection hole is placed on a cover plate, then the sealing nail is pressed on the cover plate by using a clamping jaw, spot pre-welding is carried out, then the clamping jaw is removed, and finally circumferential welding is carried out on the sealing nail. However, the conventional operation mode of performing spot pre-welding and then performing full-welding is complex in flow, so that the welding beat is slow. And when dotting prewelding, a gap is easily generated between the sealing nail and the cover plate, the welding tightness is reduced, and the product quality is influenced.
Based on the technical problems, according to the welding assembly and the welding method provided by the invention, the pressing piece is abutted against the liquid injection hole sealing nail to be welded to provide certain pressure for the surface of the liquid injection hole sealing nail, so that the position relation among the welding piece, the liquid injection hole sealing nail and the liquid injection hole is kept unchanged in the working process of the welding piece, the welding piece adopts a laser welding piece, the pulse welding or the full-length welding of continuous welding is adopted in the welding mode, and the pressing piece is removed after the welding is finished. The operation mode simplifies the welding process of the liquid injection hole sealing nail and improves the welding beat; the process of dotting and prewelding the liquid injection hole sealing nail before welding in the prior art is cancelled, welding marks left on the surface of the liquid injection hole sealing nail in the prewelding process are avoided, the flatness of the surface of the liquid injection hole sealing nail is improved, and therefore the machining precision of the button cell is improved.
In order to make the purpose, technical solutions and advantages of the present invention clearer, technical solutions in embodiments of the present invention will be described in more detail below with reference to the accompanying drawings in preferred embodiments of the present invention. In the drawings, the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The described embodiments are only some, but not all embodiments of the invention. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention. 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. Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
FIG. 1 is a front view of a welded assembly provided by an embodiment of the present invention. FIG. 2 is a top view of a welded assembly provided by an embodiment of the present invention. FIG. 3 is a schematic diagram of a compression member of a welding assembly according to an embodiment of the present invention. Fig. 4 is a schematic view of a shape of a weld joint after welding is completed by the welding method according to the embodiment of the invention. Fig. 5 is a schematic view of a weld structure after welding is completed by the welding method according to the embodiment of the invention. Fig. 6 is a schematic partial structure diagram of a portion I in fig. 5 according to an embodiment of the present invention. Fig. 7 is a schematic flow chart of a welding method according to an embodiment of the present invention. Fig. 8 is a schematic flow chart illustrating the formation of a weld joint by welding the pour hole sealing nail and the battery case according to the welding method provided by the embodiment of the invention.
Referring to fig. 1 to 3, an embodiment of the present invention provides a welding assembly including a welding member 6 and a pressing member 2 for welding a battery case 3 having a pour hole 5 to a pour hole sealing nail 1. The pressing piece 2 abuts against the surface of the liquid injection hole sealing nail 1 to press the liquid injection hole sealing nail 1 on the battery shell 3 and cover the liquid injection hole 5 on the battery shell 3; the pressing piece 2 is of an annular structure, an annular cavity is formed in the pressing piece 2, the welding end of the welding piece 6 faces the liquid injection hole sealing nail 1 in the annular cavity, and the liquid injection hole sealing nail 1 is welded on the battery shell 3.
Before welding, the welding liquid injection hole sealing nail 1 and the battery shell 3 are positioned before welding, and during welding, the pressing piece 2 abuts against the surface of the liquid injection hole sealing nail 1 to provide a certain pressing force for the surface of the liquid injection hole sealing nail, so that the position relation between the liquid injection hole sealing nail 1 and the battery shell is kept unchanged in the welding process. The annular cavity 21 is arranged in the pressing piece 2, the annular cavity 21 has a certain projection surface in the horizontal plane direction of the surface of the liquid injection hole sealing nail 2, in the subsequent welding process, the welding piece 6 works on the position where the projection surface is contacted with the battery shell 3 so as to complete the welding between the liquid injection hole sealing nail 2 and the battery shell 3, and at the moment, the pressing piece 2 also plays a role in positioning the welding piece 6.
In a practical manner, the annular chamber 21 is arranged coaxially with the liquid inlet 5 of the battery housing 3. The welding assembly is arranged in the embodiment, so that after welding is completed, the liquid injection hole sealing nail 1 is connected with the battery shell 3, the welded liquid injection hole sealing nail 1 covers the liquid injection hole 5, sealing of the button battery is completed, and the problems of liquid leakage and the like of the battery in subsequent application are avoided.
In this, and as shown with reference to fig. 2, as an achievable embodiment, the inner diameter of the annular chamber 21 of the pressure piece 2 is greater than 2 mm. The wall thickness of the annular pressing piece 2 is greater than 0.2 mm. The size of the annular cavity 21 that sets up the piece 2 can ensure to annotate and leave sufficient clearance between the profile of the projection face of the annular cavity 21 on the sealed nail 1 surface of liquid hole and the profile of annotating liquid hole 5, guarantee that subsequent processing demand accords with the requirement to annotate the leakproofness of liquid hole 5, when the annular cavity internal diameter is less than or equal to 2mm, it is less to annotate the clearance between the profile of the projection face of the annular cavity 21 that compresses tightly the piece 2 on the sealed nail 1 surface of liquid hole and the profile of annotating liquid hole 5, can't satisfy the demand of follow-up processing, reduce the sealed nail 1 of notes liquid hole after the welding and to annotate the sealing performance of liquid hole 5, the wall thickness that sets up the piece 2 that compresses tightly is greater than 0.2mm and can ensure the mechanical strength that compresses tightly the piece, avoid simultaneously because compress tightly the piece 2.
In an implementation manner, the welding part 6 is a laser welding part, and the welding end of the welding part 6 is provided with a laser emitter, and a laser beam emitted by the laser emitter faces the liquid injection hole sealing nail 1 in the annular cavity 21. Laser welding has the characteristics of high energy density and concentrated heating, can realize the quick connection of sheets, and the laser beam emitted by the laser emitter faces the liquid injection hole sealing nail 1 in the annular cavity, so that the correct welding between the liquid injection hole sealing nail 1 and the battery shell 3 is ensured.
The welding part 6 is a pulse welding part, and the welding spot overlapping rate of the welding spot 4 is more than 50 percent; alternatively, weldment 6 is a continuous weldment. As one way of accomplishing this, the pulsed welding member is a pulsed laser welding wherein the laser welding member repeats an optical output frequency of 10 or less2Hz, the shape of the welding seam 4 is point-shaped, and the setting is more than 50 percent during pulse laser weldingThe welding spot overlap ratio can ensure that the welded liquid injection hole sealing nail 1 has a good sealing effect, when the welding spot overlap ratio of pulse laser welding is less than or equal to 50%, the welded liquid injection hole sealing nail 1 and the battery shell 3 cannot be tightly combined, the sealing performance of the liquid injection hole 5 is poor, and therefore the battery performance is influenced. In addition, the coincidence rate of the welding points of the pulse laser welding is not too large, otherwise, the welding beat is increased, and the welding efficiency is influenced. As another achievable embodiment, the continuous weld is a continuous laser weld, in which case the laser weld repeats an exit frequency of 102Hz-106Hz, the welding mode can obtain even and smooth welding seams 4, and the subsequent grinding or polishing treatment of the welding seams 4 is not needed. The positional relationship among the pour hole sealing nail 1, the presser 2, the battery case 3, the weld 4, and the pour hole 5 is specifically shown in fig. 3.
On this basis, referring to fig. 7, an embodiment of the present invention further provides a welding method, including:
s1: and placing the liquid injection hole sealing nail at the liquid injection hole of the battery shell and covering the liquid injection hole. At the moment, the liquid injection hole sealing nail 1 and the liquid injection hole 5 are coaxially placed, and a foundation is laid for the subsequent work of a welding part 6.
S2: the pressing piece is abutted against the surface of the liquid injection hole sealing nail so as to press the liquid injection hole sealing nail on the battery shell; wherein, compressing tightly the piece and be the annular structure, compressing tightly the inside annular chamber that has of piece. Based on the positional relationship between the pour hole sealing nail 1 and the pour hole 5 having been determined in S1, the pour hole 5 is in the battery case 4, and the positional relationship between the pour hole sealing nail 1 and the battery case 3 is determined in S1, and at this time, the pressing member 2 is provided to abut against the surface of the pour hole sealing nail 1, and the pressing member 2 provides a certain pressing force to the surface of the pour hole sealing nail 1, ensuring that the positional relationship between the pour hole sealing nail 1 and the battery case 3 remains unchanged during welding.
S3: and (3) welding the welding end of the welding part towards the liquid injection hole sealing nail in the annular cavity, and welding the liquid injection hole sealing nail and the battery shell. The pressing member 2 is of an annular structure and internally has an annular cavity 21. During welding, the welding end of the welding part 6 faces the liquid filling hole internal sealing nail 1 in the annular cavity 21, the annular cavity 21 has a certain projection surface in the horizontal plane direction of the surface of the liquid filling hole internal sealing nail 1 to be welded, and the welding part 6 works on the contact position of the projection surface and the battery shell 3 so as to realize welding between the liquid filling hole internal sealing nail 1 to be welded and the battery shell 3.
As one way of achieving this, referring to fig. 8, the step of welding the pour hole sealing nail 1 and the battery case 3 by facing the welded end of the weld member 6 toward the pour hole sealing nail 1 in the annular cavity 21 in S3 specifically includes:
s301: the laser of the welding part melts at least part of the liquid injection hole sealing nail in the annular cavity, and the at least part of the liquid injection hole sealing nail is embedded into the battery shell.
S302: a weld is formed on the surface of the liquid injection hole sealing nail far away from the battery shell and at the joint between the liquid injection hole sealing nail and the battery shell. Referring to fig. 5, the weld 4 is formed by laser melting of the weld member 6, and at least a portion of the weld 4 having a width h is embedded in the battery case 3. The welding method can ensure that the liquid filling hole sealing nail 1 and the battery shell 3 can be tightly connected.
As one way of achieving this, the weld 4 of the pour-hole sealing nail 1 away from the surface of the battery case 3 forms an annular track on the surface of the pour-hole sealing nail 1. The center of the annular track and the center of the annular cavity 21 are coaxially arranged, the inner diameter of the annular track is larger than the diameter of the liquid injection hole 5, and the outer diameter of the annular track is smaller than the inner diameter of the annular cavity 21. As shown in fig. 3, the welding seam 4 on the surface of the liquid filling hole sealing nail 1 far away from the battery shell 3 forms an annular track on the surface of the liquid filling hole sealing nail 1; in order to ensure the welding strength, the welding seam 4 has a certain width, the center of the annular track and the center of the annular cavity 21 are coaxially arranged, the inner diameter of the annular track is larger than the diameter of the liquid injection hole 5, and the outer diameter of the annular track is smaller than the inner diameter of the annular cavity 21. During the operation of the welding part 6, the center of the welding seam 4 is arranged coaxially with the center of the annular cavity 21, and the pressing part 2 plays a role in positioning the welding part 6. After welding, the welding seam 4 of the annular track corresponds to the shape of the liquid injection hole 5, and the projection of the welding seam 4 in the horizontal direction on the battery shell 3 is not overlapped with the liquid injection hole 5, so that the welded liquid injection hole sealing nail 1 can play a role in sealing the liquid injection hole 5. The working process of the welding part 6 is full-length welding, the defect that the welding beat is slow due to the fact that spot welding needs to be carried out on the liquid injection hole sealing nail 1 firstly and then circumferential welding is carried out on the liquid injection hole sealing nail in the prior art is overcome, meanwhile, the welding defect which easily occurs in laser spot welding is avoided, and the welding yield is improved.
In an achievable manner, the weld 4 of the pour hole sealing nail 1 on the surface away from the battery case 3 is any one or more of a point, a line, a spiral or a sine. When welding the liquid injection hole sealing nail 1, a user can weld and form welding seams 4 with different shapes according to different processing conditions or use requirements. When the welding mode adopted by the welding part 6 is pulse welding, the shape of the welding seam 4 is point-shaped, and when the welding mode adopted by the welding part 6 is continuous welding, the shape of the welding seam 4 can be any one or more of point-shaped, linear, spiral or sine. Referring to fig. 4, the shape of the weld 4 is sinusoidal. The welding track of the spiral and sine welding seams 4 can improve the width of the welding seams 4, reduce the welding stress at the welding seams 4, ensure the mechanical performance of the welding seams 4, and further ensure that the welded liquid injection hole sealing nail 1 and the battery shell 3 have good sealing performance on the liquid injection hole 5. The penetration of the welding seam is more than 0.05 mm; and/or the weld bead has a weld width greater than 0.25 mm. Referring to fig. 5, the penetration depth d of the weld 4 is the depth of the weld 4 that the welded sealing nail 1 to be welded is embedded into the connecting piece 3 to be welded and forms at least part of the weld 4, and the fusion width r of the weld 4 is the distance between two weld toes of the weld 4, namely the width of the weld 4. When the penetration d of the welding seam 4 is less than 0.05mm and the penetration r of the welding seam 4 is less than 0.25mm, the welding strength is low, the sealing performance of the welded sealing nail 1 to be welded on the liquid injection hole 5 is poor, and the phenomena of battery leakage and the like are easy to occur subsequently.
As one way of realisation, with reference to fig. 6, the surface of the weld bead 4 has a welding projection 41, the height h of the welding projection 41 being less than or equal to 100 μm. When the height h of the welding bulge 41 is less than or equal to 100 micrometers, the smoothness of the surface of the button battery can be guaranteed, the height of the button battery meets the industrial processing standard, the use performance of the button battery in a miniature electronic product is guaranteed, and when the height of the welding bulge is greater than 100 micrometers, the button battery after the liquid injection hole sealing nail 1 is welded cannot meet the use requirement of the button battery in a miniature electronic element or a precise electronic element, so that the subsequent working performance of the button battery is influenced.
In conclusion, the welding assembly and the welding method provided by the invention are used for welding the battery shell with the liquid injection hole and the liquid injection hole sealing nail, the welding process of the liquid injection hole sealing nail is simplified, and the welding beat is improved; the process of dotting and prewelding the sealing nail to be welded before welding in the prior art is cancelled, so that welding marks left on the surface of the sealing nail to be welded in the prewelding process are avoided, the defects caused by the sealing nail to be welded and a connecting piece to be welded in the dotting and prewelding process are avoided, and the welding yield and the welding stability of the sealing nail of the button cell are improved.
In the description of the present invention, it should be noted that unless otherwise specifically stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning a fixed connection, an indirect connection through intervening media, a connection between two elements, or an interaction between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations. The terms "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless specifically stated otherwise.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims of the present application and in the drawings described above, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A welding assembly for welding a battery shell with a liquid injection hole and a liquid injection hole sealing nail is characterized by comprising a welding part and a pressing part, wherein the pressing part is abutted against the surface of the liquid injection hole sealing nail so as to press the liquid injection hole sealing nail on the battery shell and cover the liquid injection hole on the battery shell;
the pressing piece is of an annular structure, an annular cavity is formed in the pressing piece, and the welding end of the welding piece faces the liquid injection hole sealing nail in the annular cavity so as to weld the liquid injection hole sealing nail on the battery shell.
2. The welding assembly of claim 1 wherein said annular cavity is disposed coaxially with said filler hole of said battery housing.
3. The welding assembly of claim 2 wherein said annular cavity of said compression member has an inner diameter greater than 2 mm;
and/or the wall thickness of the pressing piece of the annular structure is larger than 0.2 mm.
4. A welding assembly according to any of claims 1 to 3, wherein said weld is a laser weld, said welding end of said weld being provided with a laser emitter which emits a laser beam which seals the nail towards said filler hole in said annular cavity.
5. The welding assembly of any of claims 1-3, wherein the weldment is a pulsed weldment that forms welds having a weld overlap greater than 50%;
or, the weldment is a continuous weldment.
6. A method of welding, comprising:
placing a liquid injection hole sealing nail at a liquid injection hole of a battery shell and covering the liquid injection hole;
abutting a pressing piece on the surface of the liquid injection hole sealing nail to press the liquid injection hole sealing nail on the battery shell; the pressing piece is of an annular structure, and an annular cavity is formed inside the pressing piece;
and the welding end of the welding part faces the liquid injection hole sealing nail in the annular cavity, and the liquid injection hole sealing nail and the battery shell are welded.
7. The welding method according to claim 6, wherein the step of welding the pour hole sealing nail and the battery case by facing the welding end of the welding member toward the pour hole sealing nail in the annular chamber, specifically comprises:
laser of the welding part melts at least part of the liquid injection hole sealing nail in the annular cavity, and at least part of the liquid injection hole sealing nail is embedded into the battery shell;
and welding seams are formed on the surface of the liquid injection hole sealing nail far away from the battery shell and at the connecting part between the liquid injection hole sealing nail and the battery shell.
8. The welding method according to claim 7, wherein the weld of the pour-hole sealing nail away from the surface of the battery case forms an annular trajectory at the surface of the pour-hole sealing nail;
the center of the annular track and the center of the annular cavity are coaxially arranged, the inner diameter of the annular track is larger than the diameter of the liquid injection hole, and the outer diameter of the annular track is smaller than the inner diameter of the annular cavity.
9. The welding method according to claim 7, wherein the weld of the pour hole sealing nail on the surface away from the battery case is any one or more of a point shape, a linear shape, a spiral shape or a sine shape;
the penetration of the welding line is more than 0.05 mm; and/or the weld bead has a weld width greater than 0.25 mm.
10. The welding method according to claim 7, wherein the surface of the weld has a welding projection having a height of 100 μm or less.
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| CN113809444A (en) * | 2021-09-17 | 2021-12-17 | 珠海冠宇电池股份有限公司 | Battery with a battery cell |
| CN113809482A (en) * | 2021-09-15 | 2021-12-17 | 珠海冠宇电池股份有限公司 | Battery and method for producing battery |
| CN114122587A (en) * | 2021-12-17 | 2022-03-01 | 珠海冠宇电池股份有限公司 | a battery |
| CN115255697A (en) * | 2022-08-15 | 2022-11-01 | 上海兰钧新能源科技有限公司 | Battery welding method and battery |
| CN115302082A (en) * | 2022-08-02 | 2022-11-08 | 武汉逸飞激光股份有限公司 | Welding method and device for sealing nail |
| CN116604188A (en) * | 2023-07-17 | 2023-08-18 | 宁德时代新能源科技股份有限公司 | Welding method, welding device, battery monomer, battery and electricity utilization device |
| WO2024148693A1 (en) * | 2023-01-09 | 2024-07-18 | 宁德时代新能源科技股份有限公司 | End cap assembly, battery cell and electric device |
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