CN113794028B - Lithium battery and welding process of explosion-proof valve of lithium battery - Google Patents
Lithium battery and welding process of explosion-proof valve of lithium battery Download PDFInfo
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- CN113794028B CN113794028B CN202111164944.9A CN202111164944A CN113794028B CN 113794028 B CN113794028 B CN 113794028B CN 202111164944 A CN202111164944 A CN 202111164944A CN 113794028 B CN113794028 B CN 113794028B
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- 238000003466 welding Methods 0.000 title claims abstract description 296
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 34
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 238000004880 explosion Methods 0.000 description 18
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000006467 substitution reaction 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
- H01M50/30—Arrangements for facilitating escape of gases
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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
- B23K26/24—Seam 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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
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- 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
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- 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)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Manufacturing & Machinery (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Gas Exhaust Devices For Batteries (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The embodiment of the invention provides a lithium battery and a welding process of an explosion-proof valve of the lithium battery, and relates to the technical field of lithium battery manufacturing. The lithium battery comprises an explosion-proof valve and a shell which are welded with each other, wherein a prepositioning welding line and a full Cheng Hanfeng are formed between the explosion-proof valve and the shell, the prepositioning welding line is in a line shape, a plurality of prepositioning welding lines are arranged at intervals, and the full Cheng Hanfeng is continuously arranged along one circle of the explosion-proof valve and is not repeated with the prepositioning welding line. In the welding process of the lithium battery explosion-proof valve, the linear welding seam is adopted for the predetermined welding, so that the structural stress of the welding can be reduced, the structural warping is relieved, the structure is more attractive, the welding quality is better, and the product yield is improved.
Description
Technical Field
The invention relates to the technical field of lithium battery manufacturing, in particular to a lithium battery and a welding process of an explosion-proof valve of the lithium battery.
Background
The explosion-proof valve is the most basic and very important link in the lithium battery manufacturing process, and the explosion-proof valve is positioned by laser spot welding firstly by vacuum suction and then welded in full stroke, so that the seamless butt joint of the explosion-proof valve and a battery shell is realized, and the explosion-proof function is realized.
In the manufacturing process, spot welding is adopted for pre-positioning, the periphery of the spot welded point is easy to tilt to generate assembly gaps, so that phenomena of full welding explosion points, uneven welding tracks and the like are caused, the appearance of a product is influenced, and the yield of the product is reduced.
Disclosure of Invention
The invention aims to provide a lithium battery and a lithium battery explosion-proof valve welding process, which can reduce welding explosion points, enable welding lines to be more attractive, reduce welding structure stress, relieve welding warpage and improve product yield.
Embodiments of the invention may be implemented as follows:
in a first aspect, the invention provides a lithium battery, which comprises an explosion-proof valve and a shell which are welded with each other, wherein a prepositioning welding line and a full Cheng Hanfeng are formed between the explosion-proof valve and the shell, the prepositioning welding line is in a line shape, a plurality of prepositioning welding lines are arranged at intervals, and the full Cheng Hanfeng is continuously arranged along one circle of the explosion-proof valve and is not repeated with the prepositioning welding line.
In an alternative embodiment, the full range weld is located inboard of the pre-positioned weld trajectory.
In an alternative embodiment, a plurality of the pre-positioning welds are uniformly and symmetrically distributed along the explosion proof valve.
In an alternative embodiment, the number of pre-positioning welds is at least eight.
In an alternative embodiment, the welding surface of the explosion-proof valve is in a round-head rectangular shape, and comprises two semicircular arc sections positioned at two ends and two straight line sections positioned at two sides, wherein each semicircular arc section is respectively provided with one pre-positioning welding seam, and each straight line section is respectively and uniformly provided with three pre-positioning welding seams at intervals.
In an alternative embodiment, the predetermined weld is less than 0.2mm from the edge of the explosion proof valve.
In a second aspect, the invention provides a welding process of an explosion-proof valve of a lithium battery, which is used for welding the explosion-proof valve and a shell, and comprises the following steps:
selecting a plurality of pre-welding positions between the explosion-proof valve and the shell, wherein each pre-welding position is welded to form a linear pre-positioning welding line;
and full-range welding is carried out between the explosion-proof valve and the shell, and a welding seam track of the full-range welding is continuously arranged along one circle of the explosion-proof valve and is not repeated with the pre-positioning welding seam.
In an alternative embodiment, the full-range welded seam track is located inside a plurality of the pre-positioned seam tracks.
In an alternative embodiment, the pre-weld location and the full Cheng Hanjie are each laser welded.
In an alternative embodiment, the welding speed of the pre-welding position is lower than the welding speed of the full-range welding.
The beneficial effects of the embodiment of the invention include, for example:
according to the lithium battery provided by the embodiment of the invention, the welding of the explosion-proof valve and the shell adopts the prepositioning welding and the full-range welding, wherein the prepositioning welding adopts the linear welding, namely the linear welding seam is formed after the welding, so that the welding contact surface is larger relative to the welding spot of the spot welding, the stress of a welding structure can be reduced, and the warping of the structure is relieved. And the weld track of the pre-positioning welding is not repeated with the weld of the full-range welding, so that the explosion point is effectively prevented, the weld track is more attractive, and the product yield is improved.
According to the welding process for the lithium battery explosion-proof valve, firstly, linear type pre-positioning welding is adopted, then full-range welding between the explosion-proof valve and the shell is carried out, the welding seam track of the full-range welding is not repeated with the welding seam track of the pre-positioning welding, explosion points are prevented, and the welding track is attractive. And the line type welding is adopted for the predetermined position welding, so that the welding structure stress is reduced, the structure warping is relieved, and the welding quality and the product yield are improved compared with the spot welding in the prior art.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic illustration of a pre-positioned weld and full Cheng Hanjie weld distribution on an explosion proof valve provided in an embodiment of the present invention.
Icon: 1-first welding line; 2-a second welding line; 3-welding line III; 4-welding line IV; 5-welding line five; 6, welding line six; 7-welding line seven; 8-welding line eight; 9-full Cheng Hanfeng; 10-explosion-proof valve.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present invention, it should be noted that, if the terms "upper", "lower", "inner", "outer", and the like indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, or the azimuth or the positional relationship in which the inventive product is conventionally put in use, it is merely for convenience of describing the present invention and simplifying the description, and it is not indicated or implied that the apparatus or element referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus it should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, if any, are used merely for distinguishing between descriptions and not for indicating or implying a relative importance.
It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.
First embodiment
Referring to fig. 1, the present embodiment provides a lithium battery, which includes an explosion-proof valve 10 and a casing (not shown) welded to each other, wherein a plurality of pre-positioning welds (numbered 1 to 8 in fig. 1) and a full Cheng Hanfeng 9 are formed between the explosion-proof valve 10 and the casing, the pre-positioning welds are in a line shape, the plurality of pre-positioning welds are arranged at intervals, and the full Cheng Hanfeng is continuously arranged along one circle of the explosion-proof valve 10 and is not repeated with the pre-positioning welds. The line type welding is adopted in the pre-positioning between the explosion-proof valve 10 and the shell, compared with the spot welding in the prior art, the line type welding is larger in welding surface, the structural stress generated by welding can be effectively reduced, the structural warping is relieved, and the attractive degree of the product is improved. The full-range welding ensures that the explosion-proof valve 10 is more firmly connected with the shell, thereby achieving the purpose of explosion prevention. The welding seam track of full-range welding is not repeated with the welding seam track of pre-positioning welding, explosion points can be prevented, the welding track is more attractive, the product yield is improved, and the production cost is saved.
It can be understood that the spot welding is adopted to perform the pre-positioning in the prior art, the periphery of the spot can be tilted by the spot positioning of the spot welding, so that an assembly gap is generated, the full-welding explosion point and the welding track are uneven, the appearance of a product is affected, and the yield of the product is reduced. In addition, the concentricity of the spot welding track and the full welding track causes poor air tightness in the welding weak area. Therefore, the line type welding is adopted for the pre-positioning in the embodiment, so that the defects can be effectively overcome, explosion points are prevented, the attractiveness and the qualification rate of the product are improved, and the production cost is saved.
Alternatively, the trajectory of full Cheng Hanfeng 9 is located inside the trajectory of the pre-weld, i.e., the trajectory of the pre-weld is closer to the edge of the explosion valve 10. In this embodiment, the weld track of the predetermined position and the weld track of the full-range welding are more biased to be disposed at the edge of the explosion-proof valve 10, so that the close connection between the explosion-proof valve 10 and the housing is facilitated, and a gap is prevented from being generated between the explosion-proof valve 10 and the housing, thereby achieving a better explosion-proof function. It should be understood that the length of each of the line-type welds may be flexibly set, for example, the length of the line-type welds may be set to 2mm to 20mm or the like according to the external dimensions of the explosion-proof valve 10 and the number of predetermined welding positions, which is not particularly limited herein.
The plurality of preset welding seams are uniformly and symmetrically distributed along the explosion-proof valve 10, so that the stress of the explosion-proof valve 10 is more uniform and the structural strength is higher. Alternatively, the number of pre-positioning welds is at least eight, the number of pre-positioning welds is too small, positioning is not precise, and the gap between the explosion-proof valve 10 and the housing is easily made too wide. The number of the pre-positioning welding positions is too large, the pre-positioning effect is better, the gap is smaller, the welding efficiency is reduced, and the cost is increased. In this embodiment, the number of pre-positioning welding positions is eight.
The preset welding seams comprise a first welding seam 1, a second welding seam 2, a third welding seam 3, a fourth welding seam 4, a fifth welding seam 5, a sixth welding seam 6, a seventh welding seam 7 and an eighth welding seam 8. The welding surface of the explosion-proof valve 10 is in a round-head rectangular shape and comprises two semicircular arc sections positioned at two ends and two straight line sections positioned at two sides, wherein each semicircular arc section is respectively provided with a prepositioning welding seam, namely a welding seam seven 7 and a welding seam eight 8, each straight line section is respectively and uniformly provided with three prepositioning welding seams at intervals, alternatively, one straight line section is respectively provided with a welding seam one 1, a welding seam four 4 and a welding seam five 5, and the other straight line section is respectively provided with a welding seam two 2, a welding seam three 3 and a welding seam six 6. It can be understood that the welding seam formed after welding on the semicircular arc section is an arc section, and the welding seam formed after welding on the straight line section is a straight line section, so that the structure of the welded product is more attractive. In other alternative embodiments, the number of welding positions may be eight, ten, twelve, etc. that are arranged on the explosion-proof valve 10 at regular intervals, and is not particularly limited herein.
Optionally, the predetermined weld is less than 0.2mm from the edge of the explosion proof valve 10. The thickness of the explosion-proof valve 10 is about 0.1mm, the edge width of the explosion-proof valve 10 is about 1.53mm, the linear welding seam formed by pre-positioning welding is about 0.1mm away from the edge of the explosion-proof valve 10, and the welding seam formed by pre-positioning welding is 1mm to 3mm away from the welding seam track formed by full-range welding, so that explosion points are effectively prevented, and a welding weak area is prevented from being formed, so that poor air tightness of a product is caused, and the explosion-proof function is influenced.
In the lithium battery provided by the embodiment of the invention, the welding of the explosion-proof valve 10 and the shell adopts the pre-positioning welding and the full-range welding, wherein the pre-positioning welding adopts the linear welding, namely the linear welding is formed after the welding, and the welding is not limited to the straight line section or the curve section. The linear welding seam formed by welding is larger in welding contact surface relative to the welding spot of spot welding, so that the stress of a welding structure can be reduced, and the warping of the structure is relieved. And the weld track of the pre-positioning welding is not repeated with the weld of the full-range welding, so that explosion points are effectively prevented, the influence of a welding weak area on the air tightness of a product is avoided, the welding track is more attractive, the yield of the welded product is effectively improved, a good explosion-proof function is ensured, and the use safety performance of a user is improved. The weld trajectory of the predetermined position and the weld trajectory of the full-range weld are more biased toward being disposed at the edge of the explosion-proof valve 10 as a whole, i.e., disposed closer to the edge of the explosion-proof valve 10. The arrangement is beneficial to the tight connection of the explosion-proof valve 10 and the shell, and prevents a gap from being generated between the explosion-proof valve 10 and the shell, thereby achieving a better explosion-proof function.
Second embodiment
The embodiment of the invention provides a welding process of an explosion-proof valve 10 of a lithium battery, which is used for welding the explosion-proof valve 10 and a battery shell and comprises the following steps:
first, a plurality of pre-welding positions, namely pre-positioning welding positions, are selected between the explosion-proof valve 10 and the shell, and each pre-welding position is welded to form a linear pre-positioning welding seam; secondly, full-range welding is performed between the explosion-proof valve 10 and the housing, and a welding line track of the full-range welding is continuously arranged along one circle of the explosion-proof valve 10 and is not repeated with a pre-positioning welding line. By the arrangement, explosion points caused by repeated positions during pre-positioning welding and full-range welding can be prevented, and welding weak areas are formed, so that the air tightness of the product is affected, and the explosion-proof effect of the product is reduced. The line type welding is adopted in the prepositioning welding, compared with the traditional spot welding, the welding contact surface is larger, the structural stress generated by welding is reduced, the phenomenon that the periphery of the welding position is warped is reduced, the welding seam track generated by welding is more attractive, and the product yield is improved.
In this embodiment, the pre-weld position and full Cheng Hanjie are laser welded, respectively. The full Cheng Hanfeng track of full range welding is positioned at the inner sides of the pre-positioning weld tracks, and the pre-positioning weld track and the full range welding weld track are integrally and more biased to be arranged at the edge of the explosion-proof valve 10, so that the close connection of the explosion-proof valve 10 and the shell is facilitated, gaps are prevented from being generated between the explosion-proof valve 10 and the shell, the air tightness is improved, and a better explosion-proof function is achieved. In this embodiment, the number of the pre-welding positions is at least eight, and for example, the eight pre-welding positions are uniformly and alternately distributed on the explosion-proof valve 10, and eight linear welding seams are formed after welding, that is, the pre-positioning welding seams include a first welding seam 1, a second welding seam 2, a third welding seam 3, a fourth welding seam 4, a fifth welding seam 5, a sixth welding seam 6, a seventh welding seam 7 and an eighth welding seam 8. The welding seam I and the welding seam II are symmetrically distributed, the welding seam III and the welding seam IV are symmetrically distributed, the welding seam V5 and the welding seam V6 are symmetrically distributed, and the welding seam V7 and the welding seam V8 are symmetrically distributed.
Optionally, the welding speed of the pre-weld location is lower than the welding speed of the full-stroke weld. Taking the explosion-proof valve 10 with the thickness of 0.1mm and the shell with the thickness of 0.5mm as an example, laser welding is adopted. When the welding is performed in advance, the pre-welding power at each pre-positioning position is about 420w, the speed is about 70mm/s, the pre-welding focal length is X-21.263 mm, and the Y axis and the Z axis are movable, which is not explained herein. During full-length welding, the power of laser welding is about 540w, the speed is about 80mm/s, the full-length welding focal distance is X-24.272 mm, and the Y axis and the Z axis are movable, and are not explained herein as in the pre-welding. Reference numerals 1 to 8 in fig. 1 denote welds formed by predetermined welding, and reference numeral 9 denotes full-length weld trajectories formed during full-length welding.
If the explosion-proof valve 10 has a thickness of 0.1mm and the casing has a thickness of 0.2mm, laser welding is used as an example. When the welding is performed in advance, the pre-welding power at each pre-positioning position is about 420w, the speed is about 70mm/s, the pre-welding focal length is X-21.263 mm, and the Y axis and the Z axis are movable, which is not explained herein. During full-scale welding, the power of laser welding is about 390w, the speed is about 80mm/s, the full-scale welding focal distance is X-24.272 mm, and the Y axis and the Z axis are movable, and are the same as the pre-positioning welding, and are not explained herein. Reference numerals 1 to 8 in fig. 1 denote welds formed by predetermined welding, and reference numeral 9 denotes full-length weld trajectories formed at the time of full-length welding.
It is easy to understand that the welding process parameters set in the laser welding are different according to the thickness dimension of the shell product, and the process parameters such as the preset welding power, the preset welding speed, the preset welding focal length, the full welding power, the full welding speed, the full welding focal length and the like can be flexibly set.
According to the welding process of the lithium battery explosion-proof valve 10 provided by the embodiment of the invention, firstly, linear type pre-positioning welding is adopted, then full-range welding between the explosion-proof valve 10 and the shell is carried out, and the welding seam track of the full-range welding is not repeated with that of the pre-positioning welding, so that explosion points can be effectively prevented, the formation of a welding weak area is avoided, the air tightness of a welded product is improved, and the welding track is more attractive. And the line type welding is adopted for the predetermined position welding, so that the welding structure stress is reduced, the warping phenomenon around the welding position is relieved, the welding quality and the product yield are improved, and the production cost is saved compared with the spot welding in the prior art.
Other parts of the content not mentioned in the present embodiment are similar to those described in the first embodiment, and will not be described here again.
In summary, the welding process for the lithium battery and the explosion-proof valve 10 for the lithium battery provided by the embodiment of the invention has the following beneficial effects:
the lithium battery and the welding process of the lithium battery explosion-proof valve 10 provided by the embodiment of the invention adopt laser welding, and have low cost and high efficiency. The line type welding is adopted for at least eight pre-welding positions by the pre-positioning welding, namely, a line type welding seam is formed, so that structural stress generated by welding is reduced relative to point type welding, the phenomenon of warping of the periphery of the welding position is prevented, and the product structure is more attractive. The weld track formed by the pre-positioning welding and the weld formed by the full-range welding are not repeated, the weld formed by the full-range welding is positioned at the inner side of the weld track formed by the pre-positioning welding, welding explosion points are prevented, a welding weak area is avoided, the air tightness of product welding is improved, and therefore the explosion-proof effect is improved. And moreover, the welding seam track formed by welding is more attractive, so that the product yield is improved, and the production cost is saved.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present invention should be included in the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (7)
1. The lithium battery is characterized by comprising an explosion-proof valve and a shell which are welded with each other, wherein a prepositioning welding line and a full Cheng Hanfeng are formed between the explosion-proof valve and the shell, the prepositioning welding line is in a line shape, a plurality of prepositioning welding lines are arranged at intervals, and the length of each line-shaped welding line is 2mm to 20mm; the full Cheng Hanfeng is continuously arranged along one circle of the explosion-proof valve and is not repeated with the pre-positioning welding line;
the full-range weld joint is positioned at the inner side of the pre-positioning weld joint track; the distance between the pre-positioning welding line and the edge of the explosion-proof valve is smaller than 0.2mm, and the distance between the welding line formed by the pre-positioning welding line and the welding line track formed by the full-range welding line is 1mm to 3mm.
2. The lithium battery of claim 1, wherein a plurality of the pre-positioned welds are uniformly and symmetrically distributed along the explosion-proof valve.
3. The lithium battery of claim 1, wherein the number of pre-positioned welds is at least eight.
4. The lithium battery of claim 3, wherein the welding surface of the explosion-proof valve is in a round-head rectangular shape and comprises two semicircular arc sections positioned at two ends and two straight line sections positioned at two sides, one pre-positioning welding seam is respectively arranged on each semicircular arc section, and three pre-positioning welding seams are respectively and uniformly arranged on each straight line section at intervals.
5. The welding process of the explosion-proof valve of the lithium battery is characterized by being used for welding the explosion-proof valve and the shell and comprising the following steps of:
selecting a plurality of pre-welding positions between the explosion-proof valve and the shell, wherein each pre-welding position is welded to form a linear pre-positioning welding line; the length of each linear welding seam is set to be 2mm to 20mm;
performing full-range welding between the explosion-proof valve and the shell, wherein a welding seam track of the full-range welding is continuously arranged along one circle of the explosion-proof valve and is not repeated with the pre-positioning welding seam; the welding seam track of the full-range welding is positioned at the inner sides of the pre-positioning welding seam tracks; the distance between the pre-positioning welding line and the edge of the explosion-proof valve is smaller than 0.2mm, and the distance between the welding line formed by the pre-positioning welding line and the welding line track formed by the full-range welding line is 1mm to 3mm.
6. The explosion-proof valve welding process for lithium battery according to claim 5, wherein the pre-welding position and the full Cheng Hanjie are respectively welded by laser.
7. The explosion-proof valve welding process for lithium battery according to any one of claims 5 to 6, wherein a welding speed of the pre-welding position is lower than a welding speed of the full range welding.
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| CN202111164944.9A CN113794028B (en) | 2021-09-30 | 2021-09-30 | Lithium battery and welding process of explosion-proof valve of lithium battery |
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| CN202111164944.9A CN113794028B (en) | 2021-09-30 | 2021-09-30 | Lithium battery and welding process of explosion-proof valve of lithium battery |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08315786A (en) * | 1995-05-16 | 1996-11-29 | Matsushita Electric Ind Co Ltd | Manufacture of square sealed battery |
| JPH09245751A (en) * | 1996-03-11 | 1997-09-19 | Toshiba Corp | Battery case body and manufacture thereof |
| CN213379838U (en) * | 2020-09-30 | 2021-06-08 | 蜂巢能源科技有限公司 | Auxiliary device for laser welding |
| CN113172341A (en) * | 2021-06-07 | 2021-07-27 | 凯博能源科技有限公司 | Welding method of battery cover plate |
| CN113346167A (en) * | 2021-06-04 | 2021-09-03 | 中航锂电科技有限公司 | Welding method of battery cover plate |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7968817B2 (en) * | 2006-10-11 | 2011-06-28 | Greatbatch Ltd. | Laser weld process for seam welded electrochemical devices |
| US20160368078A1 (en) * | 2015-06-18 | 2016-12-22 | Ford Global Technologies, Llc | Method of welding workpieces together while minimizing distortion |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08315786A (en) * | 1995-05-16 | 1996-11-29 | Matsushita Electric Ind Co Ltd | Manufacture of square sealed battery |
| JPH09245751A (en) * | 1996-03-11 | 1997-09-19 | Toshiba Corp | Battery case body and manufacture thereof |
| CN213379838U (en) * | 2020-09-30 | 2021-06-08 | 蜂巢能源科技有限公司 | Auxiliary device for laser welding |
| CN113346167A (en) * | 2021-06-04 | 2021-09-03 | 中航锂电科技有限公司 | Welding method of battery cover plate |
| CN113172341A (en) * | 2021-06-07 | 2021-07-27 | 凯博能源科技有限公司 | Welding method of battery cover plate |
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| CN113794028A (en) | 2021-12-14 |
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