CN113794028A - Lithium battery and welding process for lithium battery explosion-proof valve - Google Patents
Lithium battery and welding process for lithium battery explosion-proof valve Download PDFInfo
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- CN113794028A CN113794028A CN202111164944.9A CN202111164944A CN113794028A CN 113794028 A CN113794028 A CN 113794028A CN 202111164944 A CN202111164944 A CN 202111164944A CN 113794028 A CN113794028 A CN 113794028A
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- 238000003466 welding Methods 0.000 title claims abstract description 310
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 37
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 238000004880 explosion Methods 0.000 description 12
- 230000000694 effects Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 238000010009 beating Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 230000002093 peripheral effect Effects 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
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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
-
- 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
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 pre-positioning welding line and a full-range welding line are formed between the explosion-proof valve and the shell, the pre-positioning welding line is in a line type, a plurality of pre-positioning welding lines are arranged at intervals, the full-range welding line is continuously arranged along a circle of the explosion-proof valve, and the pre-positioning welding line and the full-range welding line are not repeated. In the welding process of the lithium battery explosion-proof valve, the wire strip type welding line adopted by pre-positioning welding can reduce the structural stress of welding, relieve the structure warpage, make the structure more attractive, improve the welding quality and improve the product yield.
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 important link in the lithium battery manufacturing process, and the explosion-proof valve is firstly positioned by vacuum suction and laser spot welding and then welded in a 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 prepositioning, the periphery of a spot welding point is easy to tilt, so that an assembly gap is generated, the phenomena of full welding and explosion, uneven welding track 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 welding process for a lithium battery and an explosion-proof valve of the lithium battery, which can reduce welding explosion points, make welding seams 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 pre-positioning welding line and a full-range welding line are formed between the explosion-proof valve and the shell, the pre-positioning welding line is in a line type, a plurality of pre-positioning welding lines are arranged at intervals, and the full-range welding line is continuously arranged along one circle of the explosion-proof valve and is not repeated with the pre-positioning welding line.
In an alternative embodiment, the full-stroke weld is located inside the pre-positioned weld trajectory.
In an alternative embodiment, a plurality of the pre-positioned welds are evenly and symmetrically distributed along the explosion-proof valve.
In an alternative embodiment, the number of prepositioned welds is at least eight.
In an optional embodiment, the welding surface of the explosion-proof valve is in a round-head rectangular shape and comprises two semi-circular arc sections located at two ends and two straight-line sections located at two sides, each semi-circular arc section is provided with one pre-positioning welding line, and each straight-line section is provided with three pre-positioning welding lines at uniform intervals.
In an alternative embodiment, the pre-positioning weld is less than 0.2mm from the edge of the explosion-proof valve.
In a second aspect, the invention provides a welding process for 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, and forming a wire type pre-positioning welding seam after each pre-welding position is welded;
and performing full-range welding between the explosion-proof valve and the shell, wherein the 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 prepositioned welding seam.
In an alternative embodiment, the full-stroke welded seam trajectory is located inside a plurality of the pre-positioned seam trajectories.
In an alternative embodiment, the pre-weld location and the full weld are each laser welded.
In an alternative embodiment, the welding speed of the pre-weld location is lower than the welding speed of the full weld.
The beneficial effects of the embodiment of the invention include, for example:
the lithium battery, the explosion-proof valve and the shell are welded by adopting pre-position welding and full-range welding, wherein the pre-position welding adopts line type welding, namely, a line type welding line is formed after welding, so that compared with a welding point of spot welding, the welding contact surface is larger, the stress of a welding structure can be reduced, and the warping of the structure is relieved. And the welding seam track of the pre-positioning welding is not repeated with the welding seam of the full-range welding, so that the explosion point is effectively prevented, the welding track is more attractive, and the product yield is improved.
According to the welding process of the lithium battery explosion-proof valve provided by the embodiment of the invention, the wire-type pre-positioning welding is adopted at first, and then the full-range welding between the explosion-proof valve and the shell is carried out, so that the welding seam track of the full-range welding is not repeated with the welding seam track of the pre-positioning welding, the explosion point is prevented, and the welding track is more attractive. And moreover, the pre-positioning welding adopts the line bar type welding, so that compared with the spot welding in the prior art, the welding structure stress is favorably reduced, the structure warping is relieved, and the welding quality and the product yield are improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic diagram of distribution of pre-positioning welding seams and full-range welding seams on an explosion-proof valve provided in the embodiment of the invention.
Icon: 1-welding a first weld; 2-welding a second seam; 3-welding a third seam; 4-welding seam four; 5-welding a fifth seam; 6-welding a sixth seam; 7-welding seam seven; 8-eighth welding seam; 9-full range welding; 10-explosion-proof valve.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of 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 present invention, 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 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.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. indicate an orientation or a positional relationship based on that shown in the drawings or that the product of the present invention is used as it is, this is only for convenience of description and simplification of the description, and it does not indicate or imply that the device or the element referred to 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.
Furthermore, the appearances of the terms "first," "second," and the like, if any, are used solely to distinguish one from another and are not to be construed as indicating or implying 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, including an explosion-proof valve 10 and a housing (not shown) welded to each other, where a plurality of pre-positioning welds (reference numerals 1 to 8 in fig. 1) and full-length welds 9 are formed between the explosion-proof valve 10 and the housing, the pre-positioning welds are in the form of a line, the pre-positioning welds are arranged at intervals, and the full-length welds 9 are continuously arranged along a circle of the explosion-proof valve 10 and are not repeated with the pre-positioning welds. The pre-positioning between the explosion-proof valve 10 and the shell adopts the line type welding, and the line type welding is larger than the spot welding in the prior art, so that the welding surface is larger, the structural stress generated by welding can be effectively reduced, the structure warpage is relieved, and the product attractiveness is improved. The full-range welding ensures that the explosion-proof valve 10 is more stably connected with the shell, thereby achieving the purpose of explosion prevention. The welding seam track of full-range welding and the welding seam track of pre-positioning welding are not repeated, so that the explosion point 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 spot welding is adopted to carry out prepositioning among the prior art, and the point location of beating of spot welding can make the peripheral perk of point location to produce the fit-up gap, and lead to full weld to explode some and welding orbit inhomogeneous, influence the product appearance, the product yield descends. Further, the spot welding locus concentric with the full-weld locus causes a weak welding region to cause poor airtightness. Therefore, the pre-positioning in the embodiment adopts the wire bar type welding, the defects can be effectively overcome, the explosion point is prevented, the attractiveness and the qualification rate of the product are improved, and the production cost is saved.
Optionally, the trajectory of the full-stroke weld 9 is located inside the trajectory of the prepositioned weld, i.e. the trajectory of the prepositioned weld is closer to the edge of the explosion-proof valve 10. In this embodiment, the pre-positioned welding seam trajectory and the full-stroke welding seam trajectory are integrally more inclined to be arranged at the edge of the explosion-proof valve 10, so that the explosion-proof valve 10 is tightly connected with the housing, 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 wire-type welding seam can be flexibly set, for example, the length of each wire-type welding seam is set to be 2mm to 20mm according to the external dimension of the explosion-proof valve 10 and the number of pre-positioning welding positions, and the like, and is not particularly limited herein.
A plurality of prepositioning welding seams are evenly and symmetrically distributed along the explosion-proof valve 10, so that the stress of the explosion-proof valve 10 is more even, and the structural strength is higher. Alternatively, the number of the pre-positioning welding seams is at least eight, the number of the pre-positioning welding positions is too small, the positioning is not accurate, and the gap between the explosion-proof valve 10 and the housing is easily too wide. The number of pre-positioning welding positions is too many, 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 prepositioned welding positions is eight as an example.
The prepositioned 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 located at two ends and two straight-line sections located at two sides, wherein each semicircular arc section is provided with a pre-positioning welding line, namely a welding line seven 7 and a welding line eight 8, each straight-line section is provided with three pre-positioning welding lines at even intervals, optionally, one straight-line section is provided with a welding line 1, a welding line four 4 and a welding line five 5, and the other straight-line section is provided with a welding line two 2, a welding line three 3 and a welding line six 6. It can be understood that the welding seam formed after the welding on the semi-circular arc section is an arc section, and the welding seam formed after the welding on the straight section is a straight section, so that the structure of a welded product is more attractive. In other alternative embodiments, the number of welding positions for prepositioning may also be eight, ten, twelve, etc., and each welding position is uniformly spaced on the explosion-proof valve 10, which is not limited herein.
Optionally, the distance between the prepositioned weld and the edge of the explosion-proof valve 10 is less than 0.2 mm. 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 distance between a linear welding seam formed by pre-positioning welding and the edge of the explosion-proof valve 10 is about 0.1mm, and the distance between the welding seam formed by pre-positioning welding and the welding seam track formed by full-range welding is 1mm to 3mm, so that an explosion point is effectively prevented, and a welding weak area is prevented from being formed, so that the air tightness of a product is poor, and the explosion-proof function is influenced.
The lithium battery, the explosion-proof valve 10 and the shell are welded by adopting pre-positioning welding and full-range welding, wherein the pre-positioning welding adopts line type welding, namely, a line type welding seam is formed after welding, and the welding seam is not limited to a straight line section or a curved line section. Compared with a welding point of spot welding, the welding contact surface of the linear welding seam formed by welding is larger, the stress of a welding structure can be reduced, and the warping of the structure is relieved. And the welding seam track of the pre-positioning welding is not repeated with the welding seam of the full-range welding, so that the explosion point is effectively prevented, the phenomenon that the air tightness of a product is influenced by a welding weak area 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 pre-positioned weld seam trajectory and the full-stroke welded weld seam trajectory as a whole are more preferentially arranged at the edge of the explosion-proof valve 10, i.e. closer to the edge of the explosion-proof valve 10. The arrangement is favorable for the tight connection of the explosion-proof valve 10 and the shell, and prevents the gap from being generated between the explosion-proof valve 10 and the shell, thereby achieving 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:
firstly, selecting a plurality of pre-welding positions, namely pre-positioning welding positions, between the explosion-proof valve 10 and the shell, and forming a wire type pre-positioning welding seam after each pre-welding position is welded; secondly, full-range welding is carried out between the explosion-proof valve 10 and the shell, the welding seam track of the full-range welding is continuously arranged along one circle of the explosion-proof valve 10, and the welding seam track is not repeated with a prepositioned welding seam. The welding device is arranged in such a way, explosion points caused by repeated positions during prepositioning welding and full-range welding can be prevented, welding weak areas are formed, the air tightness of a product is influenced, and the explosion-proof effect of the product is reduced. The pre-positioning welding adopts the line type welding, compared with the traditional spot welding, the welding contact surface is larger, the structural stress generated by welding is reduced, the warping phenomenon at the periphery of the welding position is reduced, the welding seam track generated by welding is more attractive, and the product yield is improved.
In this embodiment, the pre-welding position and the full-stroke welding are laser welding respectively. The full-stroke welding seam 9 track of full-stroke welding is located the inboard of a plurality of prepositioning welding seam tracks, and the whole edge that sets up at explosion-proof valve 10 that is more inclined to in prepositioning welding seam track and full-stroke welding seam track is so set up, is favorable to the zonulae occludens of explosion-proof valve 10 and shell, prevents to produce the clearance between explosion-proof valve 10 and the shell, improves the gas tightness to reach better explosion-proof function. In this embodiment, the number of the pre-welding positions is at least eight, and taking eight pre-welding positions as an example, the eight pre-welding positions are uniformly distributed on the explosion-proof valve 10 at intervals, and eight linear welding seams are formed after welding, that is, the pre-positioning welding seams include a welding seam one 1, a welding seam two 2, a welding seam three 3, a welding seam four 4, a welding seam five 5, a welding seam six 6, a welding seam seven 7, and a welding seam eight 8. Wherein, the first welding seam 1 and the second welding seam 2 are symmetrically distributed, the third welding seam 3 and the fourth welding seam 4 are symmetrically distributed, the fifth welding seam 5 and the sixth welding seam 6 are symmetrically distributed, and the seventh welding seam 7 and the eighth welding seam 8 are symmetrically distributed.
Optionally, the welding speed of the pre-weld location is lower than the welding speed of a full weld. For example, the thickness of the explosion-proof valve 10 is 0.1mm, and the thickness of the housing is 0.5mm, and laser welding is adopted. When pre-positioning welding is carried out, the pre-welding power at each pre-positioning position is about 420w, the speed is about 70mm/s, the pre-welding focal distance is X-21.263 mm, and the Y axis and the Z axis move, which is not explained here. During full-range welding, the power of laser welding is about 540w, the speed is about 80mm/s, the full-range focal distance is X-24.272 mm, and the Y-axis and the Z-axis are moved, which is the same as the prewelding and is not explained here. As shown in fig. 1, reference numerals 1 to 8 denote welds formed by pre-positioning welding, and reference numeral 9 denotes a full-length weld trace formed during full-length welding.
If the thickness of the explosion-proof valve 10 is 0.1mm and the thickness of the shell is 0.2mm, laser welding is adopted. When pre-positioning welding is carried out, the pre-welding power at each pre-positioning position is about 420w, the speed is about 70mm/s, the pre-welding focal distance is X-21.263 mm, and the Y axis and the Z axis move, which is not explained here. In full-range welding, the power of laser welding is about 390w, the speed is about 80mm/s, the full-range focal distance X-axis-24.272 mm, and the Y-axis and Z-axis are moved, as in prepositioning welding, and are not explained here. As shown in fig. 1, reference numerals 1 to 8 denote welds formed by pre-positioning welding, and reference numeral 9 denotes a full-length weld trace formed during full-length welding.
It is easy to understand that the welding process parameters set in the laser welding are different according to different thickness sizes of shell products, and the process parameters such as pre-positioning welding power, pre-welding speed, pre-welding focal length, full-welding power, full-welding speed, full-welding focal length and the like can also be flexibly set.
According to the welding process of the lithium battery explosion-proof valve 10 provided by the embodiment of the invention, the wire-type pre-positioning welding is adopted at first, and then the full-range welding between the explosion-proof valve 10 and the shell is carried out, so that the welding seam track of the full-range welding and the welding seam track of the pre-positioning welding are not repeated, the explosion point can be effectively prevented, the formation of a welding weak area is avoided, the air tightness of a welding product is improved, and the welding track is more attractive. And moreover, the pre-positioning welding adopts the wire-strip type welding, so that compared with the spot welding in the prior art, the welding structure stress is favorably reduced, the warping phenomenon generated at the periphery of the welding position is relieved, the welding quality and the product yield are improved, and the production cost is saved.
The contents of other parts not mentioned in this embodiment are similar to those described in the first embodiment, and are not described again here.
In summary, the welding process for the lithium battery and the lithium battery explosion-proof valve 10 provided by the embodiment of the invention has the following beneficial effects:
the welding process of the lithium battery and the lithium battery explosion-proof valve 10 provided by the embodiment of the invention adopts laser welding, and has low cost and high efficiency. The pre-positioning welding adopts the line type welding to at least eight pre-welding positions, namely, the line type welding seam is formed, so that the structural stress generated by welding is favorably reduced relative to the point welding, the phenomenon of warping around the welding position is prevented, and the product structure is more attractive. The welding seam orbit that the prepositioning welding formed and the welding seam that full range welding formed are not repeated, and the welding seam that full range welding formed is located the inboard of the welding seam orbit that the prepositioning welding formed, prevents the welding explosion point, avoids forming the welding weak area, improves product welded gas tightness to promote explosion-proof effect. Moreover, the welding seam track formed by welding is more attractive, the product yield is favorably improved, and the production cost is saved.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. The lithium battery is characterized by comprising an explosion-proof valve and a shell which are welded with each other, wherein a pre-positioning welding line and a full-range welding line are formed between the explosion-proof valve and the shell, the pre-positioning welding line is in a line type, the pre-positioning welding line is arranged at intervals, and the full-range welding line is arranged continuously along one circle of the explosion-proof valve and is not repeated with the pre-positioning welding line.
2. The lithium battery of claim 1, wherein the full-scale weld is located inside the pre-positioned weld trajectory.
3. The lithium battery of claim 1, wherein a plurality of the pre-positioned welds are evenly and symmetrically distributed along the explosion-proof valve.
4. The lithium battery of claim 1 wherein the number of pre-positioned welds is at least eight.
5. The lithium battery as claimed in claim 4, wherein the welding surface of the explosion-proof valve is in a round-head rectangular shape and comprises two semicircular arc sections at two ends and two straight line sections at two sides, each semicircular arc section is provided with one pre-positioning welding line, and each straight line section is provided with three pre-positioning welding lines at uniform intervals.
6. The lithium battery of any of claims 1 to 5, characterized in that the pre-positioning weld is at a distance of less than 0.2mm from the edge of the explosion-proof valve.
7. A welding process for an explosion-proof valve of a lithium battery 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, and forming a wire type pre-positioning welding seam after each pre-welding position is welded;
and performing full-range welding between the explosion-proof valve and the shell, wherein the 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 prepositioned welding seam.
8. The lithium battery explosion-proof valve welding process as claimed in claim 7, wherein the weld track of the full-stroke welding is located inside the plurality of pre-positioning weld tracks.
9. The welding process for the explosion-proof valve of the lithium battery as claimed in claim 7, wherein the prewelding position and the full-stroke welding are respectively laser welding.
10. The lithium battery explosion-proof valve welding process as claimed in any one of claims 7 to 9, wherein the welding speed of the pre-welding position is lower than that of the full-range welding.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023217228A1 (en) * | 2022-05-12 | 2023-11-16 | 比亚迪股份有限公司 | Explosion-proof valve, battery, battery module, battery pack and vehicle |
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| 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 |
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| WO2023217228A1 (en) * | 2022-05-12 | 2023-11-16 | 比亚迪股份有限公司 | Explosion-proof valve, battery, battery module, battery pack and vehicle |
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| CN113794028B (en) | 2024-03-19 |
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