WO2024086992A1 - 电池单体、电池、用电装置、焊接方法以及设备 - Google Patents

电池单体、电池、用电装置、焊接方法以及设备 Download PDF

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Publication number
WO2024086992A1
WO2024086992A1 PCT/CN2022/127138 CN2022127138W WO2024086992A1 WO 2024086992 A1 WO2024086992 A1 WO 2024086992A1 CN 2022127138 W CN2022127138 W CN 2022127138W WO 2024086992 A1 WO2024086992 A1 WO 2024086992A1
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WO
WIPO (PCT)
Prior art keywords
welding
laser
section
seal
welding section
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Application number
PCT/CN2022/127138
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English (en)
French (fr)
Inventor
陈从胜
林文法
丁宇
温耀铃
Original Assignee
宁德时代新能源科技股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 宁德时代新能源科技股份有限公司 filed Critical 宁德时代新能源科技股份有限公司
Priority to CN202280088334.1A priority Critical patent/CN118541870A/zh
Priority to PCT/CN2022/127138 priority patent/WO2024086992A1/zh
Publication of WO2024086992A1 publication Critical patent/WO2024086992A1/zh

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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
    • 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
    • H01M50/60—Arrangements or processes for filling or topping-up with liquids; Arrangements or processes for draining liquids from casings
    • H01M50/609—Arrangements or processes for filling with liquid, e.g. electrolytes
    • H01M50/627—Filling ports
    • H01M50/636—Closing or sealing filling ports, e.g. using lids
    • 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
    • H01M50/60—Arrangements or processes for filling or topping-up with liquids; Arrangements or processes for draining liquids from casings
    • H01M50/609—Arrangements or processes for filling with liquid, e.g. electrolytes
    • H01M50/627—Filling ports
    • H01M50/636—Closing or sealing filling ports, e.g. using lids
    • H01M50/645—Plugs

Definitions

  • the present application relates to the field of battery technology, and in particular to a battery cell, a battery, an electrical device, a welding method and equipment.
  • the seals of battery cells are usually formed by one-step welding using pulsed laser or continuous laser.
  • the pulsed laser has a low welding speed, which limits the production capacity.
  • the continuous laser is affected by the welding heat, and the residual electrolyte inside forms steam, which is discharged from the end point, forming a large number of end pore defects.
  • the welding yield of the welded seal cannot meet the requirements.
  • the present application provides a battery cell, a battery, an electrical device, a welding method and an apparatus, aiming to solve the problems of low welding speed and low quality rate in the existing sealing welding process.
  • the present application provides a battery cell, comprising:
  • the end cap comprising a liquid injection hole
  • sealing member being sealingly connected to the injection hole
  • a first welding section and a second welding section are formed between the seal and the end cover, and at least a portion of the first welding section and at least a portion of the second welding section together form an annular weld surrounding the seal.
  • the first welding section is formed by continuous laser
  • the second welding section is formed by pulsed laser.
  • a first welding section and a second welding section are formed between the seal and the end cover.
  • the first welding section is formed by continuous laser emitted by a continuous laser
  • the second welding section is formed by pulsed laser emitted by a pulsed laser.
  • the second welding section includes a head section, a middle section, and a tail section that are connected in sequence, and the middle section is connected to the first welding section to form the annular weld.
  • the welding quality rate can be improved by setting the middle part of the second welding section to be connected to the first welding section to form an annular weld.
  • the head and the tail are of equal length.
  • the head and the tail by setting the length of the head and the tail to be equal, the head and the tail can be symmetrically arranged, thereby beautifying the annular weld.
  • the head portion and/or the tail portion partially overlaps with the first welding segment.
  • the sealing performance of the seal can be improved by arranging the head and/or tail of the second welding section to overlap with part of the first welding section.
  • the middle dimension is no less than 1 mm.
  • the middle size of the second welding section by setting the middle size of the second welding section to be no less than 1 mm, a sufficient area can be reserved for the electrolyte vapor to be discharged, thereby avoiding the formation of finishing defects.
  • the length of the first weld segment in the annular weld is greater than the length of the second weld segment in the annular weld.
  • the length of the first welding section by setting the length of the first welding section to be greater than the length of the second welding section, it is possible to ensure that continuous laser welding is the main welding method and pulse laser welding is the secondary welding method. Since the continuous laser welding rate is faster, the welding rate of the seal can be increased.
  • the spacing between the welding points of the first welding section is equal to the spacing between the welding points of the second welding section.
  • the appearance of the annular weld can be ensured to be consistent.
  • the diameter of the welding spot of the first welding segment is equal to the diameter of the welding spot of the second welding segment.
  • the diameter of the welding point of the first welding section is equal to the diameter of the welding point of the second welding section, thereby ensuring that the width of the annular weld is consistent.
  • the present application provides a battery, comprising the battery cell in the above-mentioned embodiment.
  • the present application provides an electrical device, comprising the battery in the above embodiment, wherein the battery is used to provide electrical energy.
  • the present application provides a welding method for welding a seal to a material, comprising:
  • the pulse laser is controlled to emit pulse laser to form a second welding section of the seal, and at least a portion of the first welding section and at least a portion of the second welding section together enclose an annular weld surrounding the seal.
  • the seal is welded in sections, and the annular weld of the seal is formed by the first welding section and the second welding section.
  • the first welding section is formed by continuous laser emitted by a continuous laser
  • the second welding section is formed by pulsed laser emitted by a pulsed laser.
  • the welding method further comprises:
  • the pulse laser is simultaneously controlled to emit pulse laser to form the second welding section of the previous seal.
  • the pulse laser can be controlled to emit pulse laser to form the second welding section of the previous seal at the same time, the welding speed can be increased.
  • the welding time of the first welding section of the seal by the continuous laser is equal to the welding time of the second welding section of the previous seal by the pulse laser, thereby avoiding material accumulation and increasing the welding speed.
  • the length of the unwelded area between the seal and the material is greater than or equal to 1 mm.
  • controlling the pulse laser to emit pulse laser to form the second welding section of the seal comprises:
  • the pulse laser is controlled to emit pulse laser at preset intervals to form a second welding section of the seal.
  • the continuous laser is a modulated continuous laser
  • the pulse laser is a YAG pulse laser
  • the large spot formed by the modulated continuous laser can improve the tolerance to electrolyte contamination, and the point appearance formed by the modulated continuous laser is no different from the appearance of the weld formed by the subsequent YAG pulse laser, thereby ensuring that the appearance of the annular weld is no different.
  • the modulated continuous laser is welding at high speed, a tail air hole is reserved to facilitate the discharge of electrolyte vapor and avoid the formation of tail defects; by setting the pulse laser to a YAG pulse laser, the flatness and beauty of the tail weld can be ensured.
  • the ratio of the welding speed to the welding frequency of the continuous laser is equal to the ratio of the welding speed to the welding frequency of the pulsed laser.
  • the single point energies emitted by the continuous laser and the pulsed laser are equal.
  • the present application provides a welding device, the welding device comprising:
  • a welding platform wherein the welding platform is arranged corresponding to the carrier, and a continuous laser and a pulse laser are respectively arranged on the welding platform, wherein the continuous laser is used to form a first welding section between the seal and the material, and the pulse laser is used to form a second welding section between the seal and the material, and at least a part of the first welding section and at least a part of the second welding section together enclose an annular weld surrounding the seal.
  • a continuous laser and a pulsed laser are respectively arranged on the welding platform, the continuous laser is used to form a first welding section between the seal and the material, and the pulsed laser is used to form a second welding section between the seal and the material. At least part of the first welding section and at least part of the second welding section together enclose a ring-shaped weld of the seal, thereby combining the high welding rate of the continuous laser and the high quality rate of the pulsed laser, thereby avoiding the problems of low welding speed and low quality rate during the welding process of the seal, and helping to improve the welding rate and welding yield of the seal.
  • the stage is configured to be rotatable so as to switch the seal and the material between the continuous laser and the pulsed laser.
  • the carrier is configured to be rotatable, thereby ensuring that the pulse laser continues to weld after the continuous laser welding is completed.
  • FIG1 is a schematic structural diagram of a vehicle according to some embodiments of the present application.
  • FIG2 is a schematic diagram of an exploded structure of a battery according to some embodiments of the present application.
  • FIG3 is a schematic diagram of the exploded structure of a battery cell according to some embodiments of the present application.
  • FIG4 is a schematic diagram of the exploded structure of the end cap of some embodiments of the present application.
  • FIG5 is a schematic diagram of the structure of an annular weld in some embodiments of the present application.
  • FIG6 is a schematic structural diagram of the head, middle and tail of the second welding section in some embodiments of the present application.
  • FIG7 is a schematic structural diagram of a first welding angle and a second welding angle in some embodiments of the present application.
  • FIG8 is a schematic flow chart of a welding method proposed in some embodiments of the present application.
  • FIG. 9 is a schematic diagram of welding equipment for a welding method according to some embodiments of the present application.
  • Box body 10 first part 11, second part 12;
  • Carrier 70 Carrier 70, welding platform 80, unloading assembly 81, loading assembly 82, laser cleaning assembly 83, nailing assembly 84, pre-welding assembly 85, continuous laser 86, pulse laser 87, CCD detection assembly 88.
  • the term "and/or" is only a description of the association relationship of associated objects, indicating that three relationships may exist.
  • a and/or B can represent: A exists alone, A and B exist at the same time, and B exists alone.
  • the character "/" in this article generally indicates that the associated objects before and after are in an "or" relationship.
  • multiple refers to more than two (including two).
  • multiple groups refers to more than two groups (including two groups), and “multiple pieces” refers to more than two pieces (including two pieces).
  • Batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of battery application areas, its market demand is also constantly expanding.
  • the seals of battery cells are usually formed by one-step welding using pulsed laser or continuous laser.
  • Pulsed laser has the advantages of mature technology and high yield, but the pulsed laser has a low welding speed, which limits the battery production capacity, and because the pulsed laser has a low beat, more welding equipment is required to meet production needs, resulting in poor consistency of penetration depth;
  • continuous laser has the advantage of fast welding speed, but due to the low tolerance of continuous laser to electrolyte, it is easy to produce defects such as pinholes/explosion points.
  • the residual electrolyte inside the continuous laser forms steam, which is discharged from the end point, forming a large number of end pore defects, and the welding yield cannot meet the requirements.
  • the sealing of the battery cell can be welded in sections, and a first welding section and a second welding section are formed between the sealing member and the end cover, and at least part of the first welding section and at least part of the second welding section together enclose an annular weld of the sealing member.
  • the first welding section is formed by a continuous laser
  • the second welding section is formed by a pulsed laser. This can combine the high welding rate of the continuous laser and the high quality rate of the pulsed laser, thereby avoiding the problems of low welding speed and low quality rate in the sealing process, and helping to improve the welding rate and welding yield of the sealing member.
  • the battery cell disclosed in the embodiments of the present application can be used in electrical devices that use batteries as power sources or various energy storage systems that use batteries as energy storage elements.
  • Electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, electric tools, battery cars, electric cars, ships, spacecraft, etc.
  • electric toys can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc.
  • spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.
  • FIG. 1 is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of the present application.
  • the vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc.
  • a battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom, head or tail of the vehicle 1000.
  • the battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source for the vehicle 1000.
  • the vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for the starting, navigation and driving power requirements of the vehicle 1000.
  • the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.
  • FIG. 2 is an exploded view of a battery 100 provided in some embodiments of the present application.
  • the battery 100 includes a box 10 and a battery cell 20, and the battery cell 20 is contained in the box 10.
  • the box 10 is used to provide a storage space for the battery cell 20, and the box 10 can adopt a variety of structures.
  • the box 10 may include a first part 11 and a second part 12, and the first part 11 and the second part 12 cover each other, and the first part 11 and the second part 12 jointly define a storage space for accommodating the battery cell 20.
  • the second part 12 may be a hollow structure with one end open, and the first part 11 may be a plate-like structure, and the first part 11 covers the open side of the second part 12, so that the first part 11 and the second part 12 jointly define a storage space; the first part 11 and the second part 12 may also be hollow structures with one side open, and the open side of the first part 11 covers the open side of the second part 12.
  • the box 10 formed by the first part 11 and the second part 12 can be in a variety of shapes, such as a cylinder, a cuboid, etc.
  • the battery 100 there may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in a mixed connection.
  • Mixed connection means that the multiple battery cells 20 are both connected in series and in parallel.
  • the multiple battery cells 20 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 20 is accommodated in the box 10; of course, the battery 100 may also be a battery module formed by connecting multiple battery cells 20 in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 10.
  • the battery 100 may also include other structures, for example, the battery 100 may also include a busbar component for realizing electrical connection between the multiple battery cells 20.
  • Each battery cell 20 may be a secondary battery or a primary battery, or a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto.
  • the battery cell 20 may be cylindrical, flat, rectangular, or in other shapes.
  • FIG3 is a schematic diagram of the exploded structure of a battery cell 20 provided in some embodiments of the present application.
  • the battery cell 20 refers to the smallest unit that constitutes a battery.
  • the battery cell 20 includes an end cap 21, a housing 22, an electrode assembly 23 and other functional components.
  • the end cap 21 refers to a component that covers the opening of the shell 22 to isolate the internal environment of the battery cell 20 from the external environment.
  • the shape of the end cap 21 can be adapted to the shape of the shell 22 to match the shell 22.
  • the end cap 21 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 21 is not easily deformed when squeezed and collided, so that the battery cell 20 can have a higher structural strength and the safety performance can also be improved.
  • Functional components such as electrode terminals 21a can be provided on the end cap 21.
  • the electrode terminal 21a can be used to electrically connect to the electrode assembly 23 for outputting or inputting electrical energy of the battery cell 20.
  • the end cap 21 can also be provided with a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold.
  • the material of the end cap 21 can also be a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not impose special restrictions on this.
  • an insulating member may be provided inside the end cap 21, and the insulating member may be used to isolate the electrical connection components in the housing 22 from the end cap 21 to reduce the risk of short circuit.
  • the insulating member may be plastic, rubber, or the like.
  • the shell 22 is a component used to cooperate with the end cap 21 to form the internal environment of the battery cell 20, wherein the formed internal environment can be used to accommodate the electrode assembly 23, the electrolyte and other components.
  • the shell 22 and the end cap 21 can be independent components, and an opening can be set on the shell 22, and the internal environment of the battery cell 20 is formed by covering the opening with the end cap 21 at the opening.
  • the end cap 21 and the shell 22 can also be integrated. Specifically, the end cap 21 and the shell 22 can form a common connection surface before other components are put into the shell, and when the interior of the shell 22 needs to be encapsulated, the end cap 21 covers the shell 22.
  • the shell 22 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the shell 22 can be determined according to the specific shape and size of the electrode assembly 23.
  • the material of the shell 22 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this.
  • the electrode assembly 23 is a component in the battery cell 100 where electrochemical reactions occur.
  • One or more electrode assemblies 23 may be included in the housing 22.
  • the electrode assembly 23 is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets.
  • the parts of the positive and negative electrode sheets with active materials constitute the main body of the battery cell assembly, and the parts of the positive and negative electrode sheets without active materials each constitute a tab 23a.
  • the positive tab and the negative tab may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery, the positive active material and the negative active material react with the electrolyte, and the tab 23a connects the electrode terminals to form a current loop.
  • the end cover 21 has a mounting surface for mounting the seal 40, and a liquid injection hole 32 is provided on the end cover 21.
  • a receiving groove 33 is provided on the mounting surface of the end cover 21.
  • the liquid injection hole 32 is provided at the bottom of the receiving groove 33, so that one end of the liquid injection hole 32 is connected to the receiving groove 33, and the other end is connected to the inner surface of the end cover 21.
  • the glue nail 31 is inserted into the liquid injection hole 32 to seal the liquid injection hole 32.
  • the seal 40 is located in the receiving groove 33, and the receiving groove 33 can be used to limit the radial movement of the seal 40, and the seal 40 is welded to the end cover 21.
  • the general outline of the existing seal 40 is generally cone-shaped, as shown in FIG4 .
  • the upper end of the glue nail 31 matches the bottom surface of the seal 40
  • the side wall of the receiving groove 33 is an inclined surface
  • the outer ring wall of the seal 40 matches the side wall of the receiving groove 33
  • the end of the outer ring wall of the seal 40 away from the glue nail 31 is close to the inner wall of the receiving groove 33 , so that the seal 40 can be used to fill the receiving groove 33 ;
  • the top surface of the seal 40 is flush with the top surface of the end cover 21 , or the top surface of the seal 40 is slightly higher than the top surface of the end cover 21 .
  • the circular joint between the seal 40 and the end cover 21 is welded so that the seal 40 is welded and fixed on the end cover 21 .
  • the welding assembly when the welding assembly is used for welding, the welding assembly emits a high-energy laser to the joint of the seal 40 and the end cover 21. Under the action of the laser, a liquid metal portion with a certain shape is formed at the joint of the seal 40 and the end cover 21. The liquid metal portion is called a welding molten pool. During the welding process, as the welding assembly moves, the metal at the tail of the molten pool cools and crystallizes to form a weld.
  • the welding speed of the pulse laser is low, which limits the battery production capacity.
  • the consistency of the penetration depth is poor.
  • the present application proposes a battery cell.
  • the battery cell 20 includes: an end cover 21, the end cover 21 includes an injection hole 32; a seal 40, the seal 40 is sealed and connected to the injection hole 32, wherein a first welding section 50 and a second welding section 60 are formed between the seal 40 and the end cover 21, at least a portion of the first welding section 50 and at least a portion of the second welding section 60 together enclose a ring-shaped weld surrounding the seal 40, the first welding section 50 is formed by a continuous laser, and the second welding section 60 is formed by a pulsed laser.
  • a first welding section 50 and a second welding section 60 are formed between the seal 40 and the end cover 21. At least a portion of the first welding section 50 and at least a portion of the second welding section 60 together enclose an annular weld of the seal 40.
  • the first welding section 50 is formed by a continuous laser
  • the second welding section 60 is formed by a pulsed laser. This can combine the high welding rate of the continuous laser and the high quality rate of the pulsed laser, thereby avoiding the problems of low welding speed and low quality rate during the welding process of the seal 40, which helps to improve the welding rate and welding yield of the seal 40.
  • the second welding segment 60 includes a head portion 61 , a middle portion 62 , and a tail portion that are sequentially connected, and the middle portion 62 is connected to the first welding segment 50 to form an annular weld.
  • the second welding section 60 is divided into a head section 61 , a middle section 62 and a tail section 63 which are connected in sequence according to the order of formation time of the second welding section 60 .
  • the welding quality rate can be improved by connecting the middle 62 of the second welding section 60 with the first welding section 50 to form an annular weld.
  • the lengths of the head portion 61 and the tail portion 63 are equal, so that the head portion 61 and the tail portion 63 can be symmetrically arranged to beautify the annular weld.
  • the head portion 61 and/or the tail portion 63 partially overlaps with the first welding segment 50 .
  • the first welding angle ⁇ 1 can be any value between [270° and 340°]
  • the second welding angle ⁇ 2 can be any value between [40° and 90°].
  • the first welding section 50 and the second welding section 60 must overlap by 10° or more. Therefore, the sum of the first welding angle ⁇ 1 and the second welding angle ⁇ 2 is not less than 370°.
  • the sealing performance of the sealing member 40 can be improved.
  • the size of the middle portion 62 is not less than 1 mm.
  • the size of the middle portion 62 of the second welding section 60 By setting the size of the middle portion 62 of the second welding section 60 to be not less than 1 mm, a sufficient area can be reserved for the electrolyte vapor to be discharged during the welding process, thereby avoiding the formation of finishing defects.
  • the length of the first welding segment 50 in the annular weld is greater than the length of the second welding segment 60 in the annular weld.
  • the length of the first welding section 50 By setting the length of the first welding section 50 to be greater than the length of the second welding section 60, continuous laser welding can be ensured as the main welding method and pulse laser welding can be ensured as the secondary welding method. Since the continuous laser welding rate is faster, the welding rate of the seal 40 can be increased.
  • the spacing between the welding points of the first welding section 50 is equal to the spacing between the welding points of the second welding section 60 .
  • the continuous laser can be a modulated continuous laser, wherein the modulated continuous laser can be modulated into a pulse mode so that the continuous first welding section 50 forms the appearance of a point weld, which is consistent in appearance with the second welding section 60 formed by the subsequent pulse laser, wherein the pulse laser can be a YAG pulse laser, thereby ensuring the smoothness and beauty of the finishing weld.
  • v1 is the welding speed of the continuous laser
  • H1 is the welding frequency of the continuous laser
  • v2 is the welding speed of the pulsed laser
  • H2 is the welding frequency of the pulsed laser
  • the stepping of the continuous laser and the pulsed laser also needs to be no greater than the preset stepping.
  • the preset step can be set in advance.
  • the diameter of the welding point of the first welding section 50 is equal to the diameter of the welding point of the second welding section 60 .
  • Figure 8 is a schematic flow chart of a welding method proposed according to some embodiments of the present application.
  • the welding method is used to weld the sealing member 40 to the material, including:
  • Step S10 when welding the sealing member 40 , controlling the continuous laser to emit continuous laser to form the first welding section 50 of the sealing member 40 .
  • the pulse laser is simultaneously controlled to emit pulse laser to form the second welding section 60 of the previous seal 40 .
  • the pulse laser can be controlled to emit pulse laser to form the second welding section 60 of the previous seal 40 at the same time, thereby increasing the welding speed.
  • the welding time taken by the continuous laser to weld the first welding section of the seal is equal to the welding time taken by the pulse laser to weld the second welding section of the previous seal.
  • the pulsed laser is also controlled to emit pulsed laser to form the second welding section 60 of the previous sealing member 40. Therefore, in order to avoid material accumulation during the welding process, in this embodiment, it is also necessary to ensure that the welding time of the first welding section 50 of the sealing member 40 welded by the continuous laser is equal to the welding time of the second welding section 60 of the previous sealing member 40 welded by the pulsed laser.
  • t 1 + ⁇ 1 *R/v 1 t 2 + ⁇ 2 *R/v 2 , where t 1 is the sum of the acceleration time and the deceleration time of the continuous laser, wherein the acceleration time is the time taken for the welding speed of the continuous laser to accelerate from zero to the stable welding speed corresponding to the continuous laser, and the deceleration time is the time taken for the welding speed of the continuous laser to decelerate from the stable welding speed corresponding to the continuous laser to zero, and the stable welding speed is the speed at which the laser emits a laser stably to start welding.
  • the stable welding speed corresponding to the continuous laser is 80 mm/s
  • ⁇ 1 is the first welding angle corresponding to the first welding section 50
  • R is the welding track radius of the seal 40
  • v 1 is the welding speed of the continuous laser
  • t 2 is the sum of the acceleration time and the deceleration time of the pulsed laser
  • the acceleration time is the time taken for the welding speed of the pulsed laser to accelerate from zero to the stable welding speed corresponding to the pulsed laser
  • the deceleration time is the time taken for the welding speed of the continuous laser to decelerate from the stable welding speed corresponding to the pulsed laser to zero
  • the stable welding speed corresponding to the pulsed laser is 7 mm/s
  • ⁇ 2 is the second welding angle corresponding to the second welding section 60
  • v2 is the welding speed of the pulse laser
  • Step S20 After the continuous laser welding is completed, the pulse laser is controlled to emit pulse laser to form the second welding section 60 of the seal 40 , and at least part of the first welding section 50 and at least part of the second welding section 60 are together enclosed to form an annular weld surrounding the seal 40 .
  • a continuous laser is controlled to emit a continuous laser to form a first welding section 50 of the seal 40.
  • a pulsed laser is controlled to emit a pulsed laser to form a second welding section 60 of the seal 40.
  • At least a portion of the first welding section 50 and at least a portion of the second welding section 60 are together enclosed to form an annular weld of the seal 40. Since in the present embodiment, the seal 40 is welded in sections, the annular weld of the seal 40 is formed by the first welding section 50 and the second welding section 60.
  • the first welding section 50 is formed by a continuous laser emitting a continuous laser
  • the second welding section 60 is formed by a pulsed laser emitting a pulsed laser.
  • the length of the unwelded area between the seal 40 and the material is greater than or equal to 1 mm.
  • the length of the unwelded area between the seal 40 and the material By setting the length of the unwelded area between the seal 40 and the material to be greater than or equal to 1 mm, a sufficient area can be reserved for the electrolyte vapor to be discharged, thereby avoiding the formation of finishing defects.
  • the pulse laser is controlled to emit pulse laser at preset intervals to form the second welding section 60 of the seal 40 .
  • the interval time can be set in advance.
  • the continuous laser is a modulated continuous laser
  • the pulse laser is a YAG pulse laser
  • the modulated continuous laser reserves a tail air hole during high-speed welding to facilitate the discharge of electrolyte vapor and avoid the formation of tail defects; by setting the pulse laser to a YAG pulse laser, the flatness and beauty of the tail weld can be ensured.
  • the ratio of the welding speed to the welding frequency of the continuous laser is equal to the ratio of the welding speed to the welding frequency of the pulse laser.
  • v1 is the welding speed of the continuous laser
  • H1 is the welding frequency of the continuous laser
  • v2 is the welding speed of the pulsed laser
  • H2 is the welding frequency of the pulsed laser
  • the single-point energy emitted by the continuous laser is equal to that emitted by the pulse laser.
  • FIG. 9 is a schematic diagram of welding equipment proposed according to some embodiments of the present application.
  • the welding equipment includes: a carrier 70 for placing the seal 40 and the material; a welding platform 80, which is arranged corresponding to the carrier 70, and a continuous laser 86 and a pulse laser 87 are respectively arranged on the welding platform 80.
  • the continuous laser 86 is used to form a first welding section 50 between the seal 40 and the material
  • the pulse laser 87 is used to form a second welding section 60 between the seal 40 and the material. At least part of the first welding section 50 and at least part of the second welding section 60 together enclose a ring-shaped weld of the seal 40.
  • the welding platform 80 and the carrier 70 may be arranged correspondingly so that the position of the carrier 70 for placing the seal 40 and the material corresponds to the working position of the welding platform 80 .
  • the welding platform 80 may also be provided with a material unloading assembly 81 , a material loading assembly 82 , a laser cleaning assembly 83 , a nailing assembly 84 , a pre-welding assembly 85 and a CCD detection assembly 88 .
  • the continuous laser 86 starts to weld the first welding section 50 of the Nth battery cell seal 40.
  • the pulse laser 87 of the next station is simultaneously welding the second welding section 60 of the N-1th battery cell seal 40.
  • the stable welding speed corresponding to the continuous laser is 80mm/s
  • ⁇ 1 is the first welding angle corresponding to the first welding section 50
  • R is the welding trajectory radius of the seal 40
  • v1 is the welding speed of the continuous laser
  • t2 is the sum of the acceleration time and the deceleration time of the pulsed laser
  • the acceleration time is the time taken for the welding speed of the pulsed laser to accelerate from zero to the stable welding speed corresponding to the pulsed laser
  • the deceleration time is the time taken for the welding speed of the continuous laser to decelerate from the stable welding speed corresponding to the pulsed laser to zero
  • the stable welding speed corresponding to the pulsed laser is 7 mm/s
  • ⁇ 2 is the second welding angle corresponding to the second welding section 60
  • v2 is the welding speed of the pulsed laser
  • the continuous laser 86 is used to form a first welding section 50 between the seal 40 and the material
  • the pulse laser 87 is used to form a second welding section 60 between the seal 40 and the material.
  • At least a portion of the first welding section 50 and at least a portion of the second welding section 60 together enclose a ring-shaped weld of the seal 40, thereby combining the high welding rate of the continuous laser and the high quality rate of the pulse laser, thereby avoiding the problems of low welding speed and low quality rate during the welding process of the seal 40, which helps to improve the welding rate and welding yield of the seal 40.
  • the carrier 70 is configured to be rotatable so that the seal 40 and the material are switched between the continuous laser 86 and the pulse laser 87 .
  • the carrier 70 rotates to align the Nth battery cell seal 40 with the working position of the pulse laser 87.
  • the pulse laser 87 continues to weld the second welding section 60 of the Nth battery cell seal 40.
  • the rotation time of the carrier 70 is sufficient for the residual electrolyte vapor in the seal 40 to be discharged, thereby avoiding the formation of tail pore defects.

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Abstract

本申请涉及电池技术领域，公开了一种电池单体、电池、用电装置、焊接方法以及设备，电池单体包括：端盖，端盖包括注液孔；密封件，密封件密封连接于注液孔，其中，密封件与端盖之间形成有第一焊接段和第二焊接段，至少部分第一焊接段与至少部分第二焊接段共同围合形成密封件的环形焊缝，第一焊接段由连续激光形成，第二焊接段由脉冲激光形成，由于本申请结合连续激光的高焊接速率和脉冲激光的高优率特点，进而能够避免密封件焊接过程中焊接速度低和低优率的问题，有助于提高密封件的焊接速率和焊接良率。

Description

电池单体、电池、用电装置、焊接方法以及设备 技术领域
本申请涉及电池技术领域，具体涉及一种电池单体、电池、用电装置、焊接方法以及设备。
背景技术
目前，电池电芯的密封件通常采用脉冲激光或连续激光一次焊接成型。但是，脉冲激光由于焊接速度低，从而限制产能，连续激光由于焊接热影响，内部残留电解液形成蒸汽，从收尾点排出，形成大量收尾气孔缺陷，焊接密封件的焊接良率无法满足要求。
发明内容
鉴于上述问题，本申请提供一种电池单体、电池、用电装置、焊接方法以及设备，旨在解决现有的密封件焊接过程中焊接速度低和低优率的问题。
第一方面，本申请提供了一种电池单体，包括：
端盖，所述端盖包括注液孔；
密封件，所述密封件密封连接于所述注液孔，
其中，所述密封件与所述端盖之间形成有第一焊接段和第二焊接段，至少部分所述第一焊接段与至少部分所述第二焊接段共同围合形成环绕所述密封件的环形焊缝，所述第一焊接段由连续激光形成，所述第二焊接段由脉冲激光形成。
本申请实施例的技术方案中，密封件与端盖之间形成有第一焊接段和第二焊接段，第一焊接段由连续激光器发出连续激光形成，第二焊接段由脉冲激光器发出脉冲激光形成，从而能够结合连续激光的高焊接速率和脉冲激光的高优率特点，进而能够避免密封件焊接过程中焊接速度低和低优率的问题，有助于提高密封件的焊接速率和焊接良率。
在一些实施例中，所述第二焊接段包括依次相连的头部、中部和尾部，所述中部与所述第一焊接段连接形成所述环形焊缝。
本申请实施例的技术方案中，由于焊接时头部和尾部激光不稳定，中部激光稳定，因此，通过设置第二焊接段的中部与第一焊接段连接形成环形焊缝，可以提高焊接优率。
在一些实施例中，所述头部和所述尾部的长度相等。
本申请实施例的技术方案中，通过设置头部和所述尾部的长度相等，从而能够对称设置头部和尾部，进而美化环形焊缝。
在一些实施例中，所述头部和/或所述尾部与所述第一焊接段部分重合。
本申请实施例的技术方案中，通过设置第二焊接段的头部和/或尾部与第一焊接段的部分重合，从而能够提高密封件的密封性。
在一些实施例中，所述中部尺寸不小于1mm。
本申请实施例的技术方案中，通过设置第二焊接段的中部尺寸不小于1mm，从而能够预留足够的区域供电解液蒸汽排出，避免收尾缺陷的形成。
在一些实施例中，所述环形焊缝中的所述第一焊接段的长度大于所述环形焊缝中的所述第二焊接段的长度。
本申请实施例的技术方案中，通过设置第一焊接段的长度大于第二焊接段的长度，从而能够确保以连续激光焊接为主要焊接方式，以脉冲激光焊接为次要焊接方式，由于连续激光焊接速率较快，从而能够提高密封件的焊接速率。
在一些实施例中，所述第一焊接段的焊点之间的间距与所述第二焊接段的焊点之间的间距相等。
本申请实施例的技术方案中，通过设置第一焊接段的焊点之间的间距与第二焊接段的焊点之间的间距相等，从而能够保证环形焊缝的外观一致。
在一些实施例中，所述第一焊接段的焊点的直径与所述第二焊接段的焊点的直径相等。
本申请实施例的技术方案中，通过第一焊接段的焊点的直径与所述第二焊接段的焊点的直径相等，从而能够确保环形焊缝的宽度一致。
第二方面，本申请提供了一种电池，包括上述实施例中的电池单体。
第三方面，本申请提供了一种用电装置，包括上述实施例中的电池，所述电池用于提供电能。
第四方面，本申请提供一种焊接方法，用于将密封件焊接于物料，包括：
在进行密封件焊接时，控制连续激光器发出连续激光形成所述密封件的第一焊接段；
在所述连续激光器焊接完成后，控制脉冲激光器发出脉冲激光形成所述密封件的第二焊接段，至少部分所述第一焊接段与至少部分所述第二焊接段共同围合形成环绕所述密封件的环形焊缝。
本申请实施例的技术方案中，对密封件进行分段焊接，密封件的环形焊缝由第一焊接 段与第二焊接段共同围合形成，第一焊接段由连续激光器发出连续激光形成，第二焊接段由脉冲激光器发出脉冲激光形成，从而能够结合连续激光的高焊接速率和脉冲激光的高优率特点，进而能够避免密封件焊接过程中焊接速度低和低优率的问题，有助于提高密封件的焊接速率和焊接良率。
在一些实施例中，所述焊接方法还包括：
在控制所述连续激光器发出连续激光形成所述密封件的第一焊接段时，同时控制所述脉冲激光器发出脉冲激光形成前一密封件的第二焊接段。
本申请实施例的技术方案中，由于在控制连续激光器发出连续激光形成所述密封件的第一焊接段时，可以同时控制脉冲激光器发出脉冲激光形成前一密封件的第二焊接段，从而能够提高焊接速度。
在一些实施例中，所述连续激光器焊接所述密封件的所述第一焊接段的焊接用时等于所述脉冲激光器焊接前一密封件的第二焊接段的焊接用时，从而能够避免堆料，提高焊接速度。
在一些实施例中，在所述连续激光器焊接完成后，所述脉冲激光器焊接前，所述密封件与所述物料之间未焊接的区域的长度大于或等于1mm。
本申请实施例的技术方案中，通过设置密封件与物料之间未焊接的区域的长度大于或等于1mm，从而能够预留足够的区域供电解液蒸汽排出，避免收尾缺陷的形成。
在一些实施例中，所述在所述连续激光器焊接完成后，控制脉冲激光器发出脉冲激光形成所述密封件的第二焊接段，包括：
在所述连续激光器焊接完成后，间隔预设时间控制脉冲激光器发出脉冲激光形成所述密封件的第二焊接段。
本申请实施例的技术方案中，通过设置连续激光器焊接与脉冲激光器焊接的间隔时间，从而能够预留足够的时间供电解液蒸汽排出，避免收尾缺陷的形成。
在一些实施例中，所述连续激光为调制连续激光，所述脉冲激光为YAG脉冲激光。
本申请实施例的技术方案中，通过将连续激光设置为调制连续激光，调制连续激光形成的大光斑可提高电解液污染容忍度，并且调制连续激光形成的点状外观与后续YAG脉冲激光的焊缝的外观无差异，从而能够保证环形焊缝的外观无差异，另外，调制连续激光在高速焊接同时，预留收尾气孔，便于电解液蒸汽排出，避免收尾缺陷的形成；通过将脉冲激光设置为YAG脉冲激光，从而能够确保收尾焊缝的平整、美观。
在一些实施例中，所述连续激光器的焊接速度与焊接频率的比值等于所述脉冲激光器 的焊接速度与焊接频率的比值。
本申请实施例的技术方案中，通过设置连续激光器与脉冲激光器的步进一致，从而能够确保第一焊接段的焊点之间的间距与第二焊接段的焊点之间的间距相等，进而能够保证环形焊缝的外观一致。
在一些实施例中，所述连续激光器和所述脉冲激光器发出的单点能量相等。
本申请实施例的技术方案中，通过设置连续激光器和脉冲激光器发出的单点能量相等，从而能够确保第一焊接段的焊点的直径与第二焊接段的焊点的直径相等，进而能够确保第一焊接段与第二焊接段的宽度一致。
第五方面，本申请提供了一种焊接设备，所述焊接设备包括：
载台，用于放置密封件和物料；
焊接平台，所述焊接平台与所述载台对应设置，所述焊接平台上分别设置连续激光器和脉冲激光器，所述连续激光器用于向所述密封件与所述物料之间形成第一焊接段，所述脉冲激光器用于向所述密封件和所述物料之间形成第二焊接段，至少部分所述第一焊接段与至少部分所述第二焊接段共同围合形成环绕所述密封件的环形焊缝。
本申请实施例的技术方案中，通过在焊接平台上分别设置连续激光器和脉冲激光器，连续激光器用于向密封件与物料之间形成第一焊接段，脉冲激光器用于向密封件和物料之间形成第二焊接段，至少部分第一焊接段与至少部分第二焊接段共同围合形成密封件的环形焊缝，从而能够结合连续激光的高焊接速率和脉冲激光的高优率特点，进而能够避免密封件焊接过程中焊接速度低和低优率的问题，有助于提高密封件的焊接速率和焊接良率。
在一些实施例中，所述载台被配置为可旋转，以使所述密封件和所述物料在所述连续激光器和所述脉冲激光器之间切换。
本申请实施例的技术方案中，通过载台被配置为可旋转，从而能够确保连续激光器焊接完成后，脉冲激光器继续进行焊接。
上述说明仅是本申请技术方案的概述，为了能够更清楚了解本申请的技术手段，而可依照说明书的内容予以实施，并且为了让本申请的上述和其它目的、特征和优点能够更明显易懂，以下特举本申请的具体实施方式。
附图说明
图1为本申请一些实施例的车辆的结构示意图；
图2为本申请一些实施例的电池的分解结构示意图；
图3为本申请一些实施例的电池单体的分解结构示意图；
图4为本申请一些实施例的端盖的分解结构示意图；
图5为本申请一些实施例的环形焊缝的结构示意图；
图6为本申请一些实施例的第二焊接段的头部、中部、尾部的结构示意图；
图7为本申请一些实施例的第一焊接角度和第二焊接角度的结构示意图；
图8为本申请一些实施例的提出的焊接方法的流程示意图；
图9为本申请一些实施例的提出的焊接方法的焊接设备示意图。
具体实施方式中的附图标号如下：
车辆1000；
电池100，控制器200，马达300；
箱体10，第一部分11，第二部分12；
电池单体20，端盖21，电极端子21a，壳体22，电极组件23，极耳23a；
胶钉31，注液孔32，容纳槽33，密封件40；
第一焊接段50，第二焊接段60；
头部61，中部62，尾部63；
第一焊接角度θ 1，第二焊接角度θ 2；
载台70，焊接平台80，下料组件81，上料组件82，激光清洗组件83，上钉组件84，预焊组件85，连续激光器86，脉冲激光器87，CCD检测组件88。
具体实施方式
下面将结合附图对本申请技术方案的实施例进行详细的描述。以下实施例仅用于更加清楚地说明本申请的技术方案，因此只作为示例，而不能以此来限制本申请的保护范围。
除非另有定义，本文所使用的所有的技术和科学术语与属于本申请的技术领域的技术人员通常理解的含义相同；本文中所使用的术语只是为了描述具体的实施例的目的，不是旨在于限制本申请；本申请的说明书和权利要求书及上述附图说明中的术语“包括”和“具有”以及它们的任何变形，意图在于覆盖不排他的包含。
在本申请实施例的描述中，技术术语“第一”“第二”等仅用于区别不同对象，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量、特定顺序或主次关系。在本申请实施例的描述中，“多个”的含义是两个以上，除非另有明确具体的限定。
在本文中提及“实施例”意味着，结合实施例描述的特定特征、结构或特性可以包含在 本申请的至少一个实施例中。在说明书中的各个位置出现该短语并不一定均是指相同的实施例，也不是与其它实施例互斥的独立的或备选的实施例。本领域技术人员显式地和隐式地理解的是，本文所描述的实施例可以与其它实施例相结合。
在本申请实施例的描述中，术语“和/或”仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。另外，本文中字符“/”，一般表示前后关联对象是一种“或”的关系。
在本申请实施例的描述中，术语“多个”指的是两个以上(包括两个)，同理，“多组”指的是两组以上(包括两组)，“多片”指的是两片以上(包括两片)。
在本申请实施例的描述中，技术术语“中心”“纵向”“横向”“长度”“宽度”“厚度”“上”“下”“前”“后”“左”“右”“竖直”“水平”“顶”“底”“内”“外”“顺时针”“逆时针”“轴向”“径向”“周向”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本申请实施例和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本申请实施例的限制。
在本申请实施例的描述中，除非另有明确的规定和限定，技术术语“安装”“相连”“连接”“固定”等术语应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或成一体；也可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通或两个元件的相互作用关系。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本申请实施例中的具体含义应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。
目前，从市场形势的发展来看，电池的应用越加广泛。电池不仅被应用于水力、火力、风力和太阳能电站等储能电源系统，而且还被广泛应用于电动自行车、电动摩托车、电动汽车等电动交通工具，以及军事装备和航空航天等多个领域。随着电池应用领域的不断扩大，其市场的需求量也在不断地扩增。
本发明人注意到，电池单体的密封件通常采用脉冲激光或连续激光一次焊接成型。脉冲激光具有工艺成熟，优率高等优点，但是，脉冲激光由于焊接速度低，从而限制了电池产能，并且由于脉冲激光的节拍低，为满足生产需求，需要较多焊接设备，导致熔深一致性较差；连续激光具有焊接速度快的优点，但是，由于连续激光对电解液的容忍度较低，易产生针孔/爆点等缺陷，此外，连续激光由于焊接热影响，内部残留电解液形成蒸汽，从收尾点排出，形成大量收尾气孔缺陷，焊接优率无法满足要求。
为了解决现有的密封件焊接过程中焊接速度低和低优率的问题，申请人研究发现，可 以对电池单体的密封件进行分段焊接，密封件与端盖之间形成有第一焊接段和第二焊接段，至少部分第一焊接段与至少部分第二焊接段共同围合形成密封件的环形焊缝，第一焊接段由连续激光形成，第二焊接段由脉冲激光形成，从而能够结合连续激光的高焊接速率和脉冲激光的高优率特点，进而能够避免密封件焊接过程中焊接速度低和低优率的问题，有助于提高密封件的焊接速率和焊接良率。
本申请实施例公开的电池单体可以用于使用电池作为电源的用电装置或者使用电池作为储能元件的各种储能系统。用电装置可以为但不限于手机、平板、笔记本电脑、电动玩具、电动工具、电瓶车、电动汽车、轮船、航天器等等。其中，电动玩具可以包括固定式或移动式的电动玩具，例如，游戏机、电动汽车玩具、电动轮船玩具和电动飞机玩具等等，航天器可以包括飞机、火箭、航天飞机和宇宙飞船等等。
以下实施例为了方便说明，以本申请一实施例的一种用电装置为车辆1000为例进行说明。
请参照图1，图1为本申请一些实施例提供的车辆1000的结构示意图。车辆1000可以为燃油汽车、燃气汽车或新能源汽车，新能源汽车可以是纯电动汽车、混合动力汽车或增程式汽车等。车辆1000的内部设置有电池100，电池100可以设置在车辆1000的底部或头部或尾部。电池100可以用于车辆1000的供电，例如，电池100可以作为车辆1000的操作电源。车辆1000还可以包括控制器200和马达300，控制器200用来控制电池100为马达300供电，例如，用于车辆1000的启动、导航和行驶时的工作用电需求。
在本申请一些实施例中，电池100不仅可以作为车辆1000的操作电源，还可以作为车辆1000的驱动电源，代替或部分地代替燃油或天然气为车辆1000提供驱动动力。
请参照图2，图2为本申请一些实施例提供的电池100的爆炸图。电池100包括箱体10和电池单体20，电池单体20容纳于箱体10内。其中，箱体10用于为电池单体20提供容纳空间，箱体10可以采用多种结构。在一些实施例中，箱体10可以包括第一部分11和第二部分12，第一部分11与第二部分12相互盖合，第一部分11和第二部分12共同限定出用于容纳电池单体20的容纳空间。第二部分12可以为一端开口的空心结构，第一部分11可以为板状结构，第一部分11盖合于第二部分12的开口侧，以使第一部分11与第二部分12共同限定出容纳空间；第一部分11和第二部分12也可以是均为一侧开口的空心结构，第一部分11的开口侧盖合于第二部分12的开口侧。当然，第一部分11和第二部分12形成的箱体10可以是多种形状，比如，圆柱体、长方体等。
在电池100中，电池单体20可以是多个，多个电池单体20之间可串联或并联或混联， 混联是指多个电池单体20中既有串联又有并联。多个电池单体20之间可直接串联或并联或混联在一起，再将多个电池单体20构成的整体容纳于箱体10内；当然，电池100也可以是多个电池单体20先串联或并联或混联组成电池模块形式，多个电池模块再串联或并联或混联形成一个整体，并容纳于箱体10内。电池100还可以包括其他结构，例如，该电池100还可以包括汇流部件，用于实现多个电池单体20之间的电连接。
其中，每个电池单体20可以为二次电池或一次电池；还可以是锂硫电池、钠离子电池或镁离子电池，但不局限于此。电池单体20可呈圆柱体、扁平体、长方体或其它形状等。
请参照图3，图3为本申请一些实施例提供的电池单体20的分解结构示意图。电池单体20是指组成电池的最小单元。如图3，电池单体20包括有端盖21、壳体22、电极组件23以及其他的功能性部件。
端盖21是指盖合于壳体22的开口处以将电池单体20的内部环境隔绝于外部环境的部件。不限地，端盖21的形状可以与壳体22的形状相适应以配合壳体22。可选地，端盖21可以由具有一定硬度和强度的材质(如铝合金)制成，这样，端盖21在受挤压碰撞时就不易发生形变，使电池单体20能够具备更高的结构强度，安全性能也可以有所提高。端盖21上可以设置有如电极端子21a等的功能性部件。电极端子21a可以用于与电极组件23电连接，以用于输出或输入电池单体20的电能。在一些实施例中，端盖21上还可以设置有用于在电池单体20的内部压力或温度达到阈值时泄放内部压力的泄压机构。端盖21的材质也可以是多种的，比如，铜、铁、铝、不锈钢、铝合金、塑胶等，本申请实施例对此不作特殊限制。在一些实施例中，在端盖21的内侧还可以设置有绝缘件，绝缘件可以用于隔离壳体22内的电连接部件与端盖21，以降低短路的风险。示例性的，绝缘件可以是塑料、橡胶等。
壳体22是用于配合端盖21以形成电池单体20的内部环境的组件，其中，形成的内部环境可以用于容纳电极组件23、电解液以及其他部件。壳体22和端盖21可以是独立的部件，可以于壳体22上设置开口，通过在开口处使端盖21盖合开口以形成电池单体20的内部环境。不限地，也可以使端盖21和壳体22一体化，具体地，端盖21和壳体22可以在其他部件入壳前先形成一个共同的连接面，当需要封装壳体22的内部时，再使端盖21盖合壳体22。壳体22可以是多种形状和多种尺寸的，例如长方体形、圆柱体形、六棱柱形等。具体地，壳体22的形状可以根据电极组件23的具体形状和尺寸大小来确定。壳体22的材质可以是多种，比如，铜、铁、铝、不锈钢、铝合金、塑胶等，本申请实施例 对此不作特殊限制。
电极组件23是电池单体100中发生电化学反应的部件。壳体22内可以包含一个或更多个电极组件23。电极组件23主要由正极片和负极片卷绕或层叠放置形成，并且通常在正极片与负极片之间设有隔膜。正极片和负极片具有活性物质的部分构成电芯组件的主体部，正极片和负极片不具有活性物质的部分各自构成极耳23a。正极极耳和负极极耳可以共同位于主体部的一端或是分别位于主体部的两端。在电池的充放电过程中，正极活性物质和负极活性物质与电解液发生反应，极耳23a连接电极端子以形成电流回路。
根据本申请的一些实施例，参照图4，端盖21具有用于安装密封件40的安装面，端盖21上开设有注液孔32，为了方便对注液孔32进行密封，在端盖21的安装面上凹设有容纳槽33，注液孔32开设于容纳槽33的槽底，以使注液孔32的一端连通容纳槽33，另一端贯通至端盖21的内表面。在安装时，将胶钉31插入注液孔32内，以对注液孔32进行密封。密封件40位于容纳槽33内，容纳槽33可以用于限制密封件40的径向移动，将密封件40与端盖21焊接在一起。
现有的密封件40的大体轮廓一般呈台锥状，如图4所示，在平行于密封件40的轴向的截面中，胶钉31的上端与密封件40的底面相配合容纳槽33的侧壁为斜面，密封件40的外环壁与容纳槽33的侧壁相配合，并且密封件40的外环壁远离胶钉31的一端贴近容纳槽33的内壁，以使密封件40可以用于填满容纳槽33；密封件40的顶面与端盖21的顶面平齐，或者使密封件40的顶面略高于端盖21的顶面。将密封件40与端盖21的圆形接合处进行焊接，以使密封件40被焊接固定在端盖21上。
以采用激光焊接装置作为焊接组件为例，当采用焊接组件进行焊接时，焊接组件向密封件40和端盖21的接合处发出高能激光，在激光作用下，密封件40和端盖21的接合处形成的具有一定形状的液态金属部分，该液态金属部分称为焊接溶池。焊接过程中，随着焊接组件的移动，熔池尾部金属冷却并结晶形成焊缝。
现有的密封件40采用脉冲激光器进行焊接时，由于脉冲激光器的焊接速度低，从而限制了电池产能，并且由于脉冲激光的节拍低，焊接设备较多，从而导致熔深一致性较差。
现有的密封件40采用连续激光器进行焊接时。连续激光器沿着预设轨迹运动过程中，焊接熔池存在大量的热量，残留在注液孔32的电解液在高能激光束的高热作用下分解出气体；当密封件40焊接完成之后，密封件40与容纳槽33的内壁面之间形成密封的容腔，气体残留在密封件40与容纳槽33之间的密封容腔内，导致密封容腔内的气压过高；高压气体容易在焊缝的首尾处形成气孔，由于气孔连通密封容腔，导致容纳槽33无法完全密 闭，进而导致端盖21存在产品缺陷，产品的焊接良率无法满足要求。
本申请针对现有的密封件焊接过程中焊接速度低和低优率的问题，提出了一种电池单体，请参照图4和图5，本示例中，电池单体20包括：端盖21，端盖21包括注液孔32；密封件40，密封件40密封连接于注液孔32，其中，密封件40与端盖21之间形成有第一焊接段50和第二焊接段60，至少部分第一焊接段50与至少部分第二焊接段60共同围合形成环绕密封件40的环形焊缝，第一焊接段50由连续激光形成，第二焊接段60由脉冲激光形成。
通过对电池单体20的密封件40进行分段焊接，密封件40与端盖21之间形成有第一焊接段50和第二焊接段60，至少部分第一焊接段50与至少部分第二焊接段60共同围合形成密封件40的环形焊缝，第一焊接段50由连续激光形成，第二焊接段60由脉冲激光形成，从而能够结合连续激光的高焊接速率和脉冲激光的高优率特点，进而能够避免密封件40焊接过程中焊接速度低和低优率的问题，有助于提高密封件40的焊接速率和焊接良率。
根据本申请的一些实施例，可选地，请参照图6，第二焊接段60包括依次相连的头部61、中部62和尾部，中部62与第一焊接段50连接形成环形焊缝。
本实施例中，按照第二焊接段60的形成时间的先后将第二焊接段60划分为依次相连的头部61、中部62和尾部63。
由于焊接时头部61和尾部63激光不稳定，中部62激光稳定，因此，通过设置第二焊接段60的中部62与第一焊接段50连接形成环形焊缝，可以提高焊接优率。
根据本申请的一些实施例，可选地，请参照图6，头部61和尾部63的长度相等，从而能够对称设置头部61和尾部63，美化环形焊缝。
根据本申请的一些实施例，可选地，请参照图7，头部61和/或尾部63与第一焊接段50部分重合。
具体地，重合角度可以基于第一焊接段50对应的第一焊接角度θ 1和第二焊接段60对应的第二焊接角度θ 2确定，例如，第一焊接段50对应的第一焊接角度θ 1为340°，第二焊接段60对应的第二焊接角度θ 2为40°时，重合角度＝340°+40°-360°＝20°。
第一焊接角度θ 1可以为[270°，340°]中的任一值，第二焊接角度θ 2可以为[40°，90°]中的任一值，为了实现至少部分第一焊接段50与至少部分第二焊接段60共同围合形成密封件40的环形焊缝的同时，保证密封件40的密封性，第一焊接段50与第二焊接段60要有10°及以上重叠。因此，第一焊接角度θ 1与第二焊接角度θ 2之和不小于370°。
通过设置第二焊接段60的头部61和/或尾部63与第一焊接段50的部分重合，从而能够提高密封件40的密封性。
根据本申请的一些实施例，可选地，请参照图6，中部62尺寸不小于1mm。
通过设置第二焊接段60的中部62尺寸不小于1mm，从而能够在焊接过程中预留足够的区域供电解液蒸汽排出，避免收尾缺陷的形成。
根据本申请的一些实施例，可选地，请参照图5，环形焊缝中的第一焊接段50的长度大于环形焊缝中的第二焊接段60的长度。
通过设置第一焊接段50的长度大于第二焊接段60的长度，从而能够确保以连续激光焊接为主要焊接方式，以脉冲激光焊接为次要焊接方式，由于连续激光焊接速率较快，从而能够提高密封件40的焊接速率。
根据本申请的一些实施例，可选地，请参照图5，第一焊接段50的焊点之间的间距与第二焊接段60的焊点之间的间距相等。
连续激光可以是调制连续激光，其中，调制连续激光可以调制为脉冲模式，以使连续第一焊接段50形成点状焊点的外观，与后续脉冲激光形成的第二焊接段60在外观上保持一致，其中，脉冲激光可以为YAG脉冲激光，从而能够确保收尾焊缝的平整、美观。
为了确保点状焊点在外观上一致，需要设置第一焊接段50的焊点之间的间距与第二焊接段60的焊点之间的间距相等，即设置发出连续激光的连续激光器和发出脉冲激光的脉冲激光器在步进上完全一致。即
Figure PCTCN2022127138-appb-000001
式中，v 1为连续激光器的焊接速度，H 1为连续激光器的焊接频率，v 2为脉冲激光器的焊接速度，H 2为脉冲激光器的焊接频率。
为了确保第一焊接段50与第二焊接段60部分重合，连续激光器和脉冲激光器的步进还需要不大于预设步进。即
Figure PCTCN2022127138-appb-000002
其中，预设步进可以预先设置。
通过设置第一焊接段50的焊点之间的间距与第二焊接段60的焊点之间的间距相等，从而能够确保环形焊缝的外观一致。
根据本申请的一些实施例，可选地，请参照图5，第一焊接段50的焊点的直径与第二焊接段60的焊点的直径相等。
为了确保第一焊接段50与第二焊接段60的宽度一致，本实施例中，需要设置连续激光器和脉冲激光器发出的单点能量相同。即：P 1*J 1＝P 2*J 2，式中，P 1为连续激光器的峰值功率，J 1为连续激光器的峰值功率对应的脉宽，P 2为脉冲激光器的峰值功率，J 2为脉冲激光器的峰值功率对应的脉宽。
根据本申请的一些实施例，参照图8，图8为根据本申请一些实施例提出的焊接方法 的流程示意图。
在本实施例中，所述焊接方法用于将密封件40焊接于物料，包括：
步骤S10：在进行密封件40焊接时，控制连续激光器发出连续激光形成所述密封件40的第一焊接段50。
根据本申请的一些实施例，可选地，在控制所述连续激光器发出连续激光形成所述密封件40的第一焊接段50时，同时控制所述脉冲激光器发出脉冲激光形成前一密封件40的第二焊接段60。
通过在控制连续激光器发出连续激光形成所述密封件40的第一焊接段50时，可以同时控制脉冲激光器发出脉冲激光形成前一密封件40的第二焊接段60，从而能够提高焊接速度，从而能够提高焊接速度。
根据本申请的一些实施例，可选地，所述连续激光器焊接所述密封件的所述第一焊接段的焊接用时等于所述脉冲激光器焊接前一密封件的第二焊接段的焊接用时。
在控制连续激光器发出连续激光形成所述密封件40的第一焊接段50时，由于还同时控制脉冲激光器发出脉冲激光形成前一密封件40的第二焊接段60。因此，为了避免焊接过程中出现堆料，本实施例中，还需要确保连续激光器焊接密封件40的第一焊接段50的焊接用时等于脉冲激光器焊接前一密封件40的第二焊接段60的焊接用时。即t 1+θ 1*R/v 1＝t 2+θ 2*R/v 2，式中，t 1为连续激光器的加速时间和减速时间之和，其中，加速时间为连续激光器的焊接速度从零到连续激光器对应的稳定焊接速度的加速用时，减速时间为连续激光器的焊接速度从连续激光器对应的稳定焊接速度到零到的减速用时，稳定焊接速度为激光器发出激光稳定开始焊接时的速度，例如，连续激光器对应的稳定焊接速度为80mm/s，θ 1为第一焊接段50对应的第一焊接角度，R为密封件40的焊接轨迹半径，v 1为连续激光器的焊接速度，t 2为脉冲激光器的加速时间和减速时间之和，其中，加速时间为脉冲激光器的焊接速度从零到脉冲激光器对应的稳定焊接速度的加速用时，减速时间为连续激光器的焊接速度从脉冲激光器对应的稳定焊接速度到零减速用时，其中，脉冲激光器对应的稳定焊接速度为7mm/s，θ 2为第二焊接段60对应的第二焊接角度，v 2为脉冲激光器的焊接速度，θ 1+θ 2>2π。
步骤S20：在所述连续激光器焊接完成后，控制脉冲激光器发出脉冲激光形成所述密封件40的第二焊接段60，至少部分所述第一焊接段50与至少部分所述第二焊接段60共同围合形成环绕所述密封件40的环形焊缝。
在本实施例中，公开了在进行密封件40焊接时，控制连续激光器发出连续激光形成 密封件40的第一焊接段50，在连续激光器焊接完成后，控制脉冲激光器发出脉冲激光形成密封件40的第二焊接段60，至少部分第一焊接段50与至少部分第二焊接段60共同围合形成密封件40的环形焊缝；由于本实施例中，对密封件40进行分段焊接，密封件40的环形焊缝由第一焊接段50与第二焊接段60共同围合形成，第一焊接段50由连续激光器发出连续激光形成，第二焊接段60由脉冲激光器发出脉冲激光形成，从而能够结合连续激光的高焊接速率和脉冲激光的高优率特点，进而能够避免密封件40焊接过程中焊接速度低和低优率的问题，有助于提高密封件40的焊接速率和焊接良率。
根据本申请的一些实施例，可选地，在所述连续激光器焊接完成后，所述脉冲激光器焊接前，所述密封件40与所述物料之间未焊接的区域的长度大于或等于1mm。
通过设置密封件40与物料之间未焊接的区域的长度大于或等于1mm，从而能够预留足够的区域供电解液蒸汽排出，避免收尾缺陷的形成。
根据本申请的一些实施例，可选地，在所述连续激光器焊接完成后，间隔预设时间控制脉冲激光器发出脉冲激光形成所述密封件40的第二焊接段60。
通过设置连续激光器焊接与脉冲激光器焊接的间隔时间，从而能够预留足够的时间供电解液蒸汽排出，避免收尾缺陷的形成。其中，间隔时间可以预先设置。
根据本申请的一些实施例，可选地，所述连续激光为调制连续激光，所述脉冲激光为YAG脉冲激光。
通过将连续激光设置为调制连续激光，调制连续激光形成的大光斑可提高电解液污染容忍度，并且调制连续激光形成的点状外观与后续YAG脉冲激光的焊缝的外观无差异，从而能够保证环形焊缝的外观无差异，另外，调制连续激光在高速焊接同时，预留收尾气孔，便于电解液蒸汽排出，避免收尾缺陷的形成；通过将脉冲激光设置为YAG脉冲激光，从而能够确保收尾焊缝的平整、美观。
根据本申请的一些实施例，可选地，所述连续激光器的焊接速度与焊接频率的比值等于所述脉冲激光器的焊接速度与焊接频率的比值。
为了确保点状焊点在外观上一致，需要设置第一焊接段50的焊点之间的间距与第二焊接段60的焊点之间的间距相等，即设置发出连续激光的连续激光器和发出脉冲激光的脉冲激光器在步进上完全一致。即
Figure PCTCN2022127138-appb-000003
式中，v 1为连续激光器的焊接速度，H 1为连续激光器的焊接频率，v 2为脉冲激光器的焊接速度，H 2为脉冲激光器的焊接频率。
根据本申请的一些实施例，可选地，所述连续激光器与所述脉冲激光器发出的单点能量相等。
为了确保第一焊接段50与第二焊接段60的宽度一致，本实施例中，需要设置连续激光器和脉冲激光器发出的单点能量相同。即：P 1*J 1＝P 2*J 2，式中，P 1为连续激光器的峰值功率，J 1为连续激光器的峰值功率对应的脉宽，P 2为脉冲激光器的峰值功率，J 2为脉冲激光器的峰值功率对应的脉宽。
根据本申请的一些实施例，参照图9，图9为根据本申请一些实施例提出的焊接设备示意图。
在本实施例中，焊接设备包括：载台70，用于放置密封件40和物料；焊接平台80，焊接平台80与载台70对应设置，焊接平台80上分别设置连续激光器86和脉冲激光器87，连续激光器86用于向密封件40与物料之间形成第一焊接段50，脉冲激光器87用于向密封件40和物料之间形成第二焊接段60，至少部分第一焊接段50与至少部分第二焊接段60共同围合形成密封件40的环形焊缝。
焊接平台80与载台70对应设置可以是载台70放置密封件40和物料的位置与焊接平台80的工位对应。
焊接平台80上还可以分别设置下料组件81、上料组件82、激光清洗组件83、上钉组件84、预焊组件85以及CCD检测组件88。
在密封件40焊接过程中，电芯经上料/激光清洗/上钉后，连续激光器86开始焊接第N个电芯密封件40的第一焊接段50，此时，下一工位的脉冲激光器87同时在焊接第N-1电芯密封件40的第二焊接段60，通过设置焊接角度和焊接速度，可满足节拍相等(即连续激光器86的焊接时间与脉冲激光器87的焊接时间相等)，即即t 1+θ 1*R/v 1＝t 2+θ 2*R/v 2，式中，t 1为连续激光器的加速时间和减速时间之和，其中，加速时间为连续激光器的焊接速度从零到连续激光器对应的稳定焊接速度的加速用时，减速时间为连续激光器的焊接速度从连续激光器对应的稳定焊接速度到零到的减速用时，稳定焊接速度为激光器发出激光稳定开始焊接时的速度，例如，连续激光器对应的稳定焊接速度为80mm/s，θ 1为第一焊接段50对应的第一焊接角度，R为密封件40的焊接轨迹半径，v 1为连续激光器的焊接速度，t 2为脉冲激光器的加速时间和减速时间之和，其中，加速时间为脉冲激光器的焊接速度从零到脉冲激光器对应的稳定焊接速度的加速用时，减速时间为连续激光器的焊接速度从脉冲激光器对应的稳定焊接速度到零减速用时，其中，脉冲激光器对应的稳定焊接速度为7mm/s，θ 2为第二焊接段60对应的第二焊接角度，v 2为脉冲激光器的焊接速度，θ 1+θ 2>2π。
在连续激光器86开始焊接第一个电芯的密封件40的第一焊接段50时，由于下一工 位的脉冲激光器87对应的载台70上没有密封件40，因此，需要控制脉冲激光器87保持不动，以避免脉冲激光器87损坏，保护设备；在脉冲激光器87开始焊接最后一个电芯的密封件40的第二焊接段60时，由于上一工位的连续激光器86对应的载台70上没有密封件40，因此，需要控制连续激光器86保持不动，以避免连续激光器86损坏，保护设备。
通过在焊接平台80上分别设置连续激光器86和脉冲激光器87，连续激光器86用于向密封件40与物料之间形成第一焊接段50，脉冲激光器87用于向密封件40和物料之间形成第二焊接段60，至少部分第一焊接段50与至少部分第二焊接段60共同围合形成密封件40的环形焊缝，从而能够结合连续激光的高焊接速率和脉冲激光的高优率特点，进而能够避免密封件40焊接过程中焊接速度低和低优率的问题，有助于提高密封件40的焊接速率和焊接良率。
根据本申请的一些实施例，可选地，载台70被配置为可旋转，以使密封件40和物料在连续激光器86和脉冲激光器87之间切换。
当连续激光器86焊接完成第N个电芯密封件40的第一焊接段50后，载台70旋转，以使第N个电芯密封件40对准脉冲激光器87的工位，脉冲激光器87继续焊接第N个电芯密封件40的第二焊接段60，载台70旋转的时间可供密封件40内残留电解液蒸汽排出，从而避免形成收尾气孔缺陷。
最后应说明的是：以上各实施例仅用以说明本申请的技术方案，而非对其限制；尽管参照前述各实施例对本申请进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分或者全部技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本申请各实施例技术方案的范围，其均应涵盖在本申请的权利要求和说明书的范围当中。尤其是，只要不存在结构冲突，各个实施例中所提到的各项技术特征均可以任意方式组合起来。本申请并不局限于文中公开的特定实施例，而是包括落入权利要求的范围内的所有技术方案。

Claims (20)

  1. 一种电池单体，包括：
    端盖，所述端盖包括注液孔；
    密封件，所述密封件密封连接于所述注液孔，
    其中，所述密封件与所述端盖之间形成有第一焊接段和第二焊接段，至少部分所述第一焊接段与至少部分所述第二焊接段共同围合形成环绕所述密封件的环形焊缝，所述第一焊接段由连续激光形成，所述第二焊接段由脉冲激光形成。
  2. 如权利要求1所述的电池单体，其中，所述第二焊接段包括依次相连的头部、中部和尾部，所述中部与所述第一焊接段连接形成所述环形焊缝。
  3. 如权利要求2所述的电池单体，其中，所述头部和所述尾部的长度相等。
  4. 如权利要求2或3所述的电池单体，其中，所述头部和/或所述尾部与所述第一焊接段部分重合。
  5. 如权利要求2至4中任一项所述的电池单体，其中，所述中部尺寸不小于1mm。
  6. 如权利要求1至5中任一项所述的电池单体，其中，所述环形焊缝中的所述第一焊接段的长度大于所述环形焊缝中的所述第二焊接段的长度。
  7. 如权利要求1至6中任一项所述的电池单体，其中，所述第一焊接段的焊点之间的间距与所述第二焊接段的焊点之间的间距相等。
  8. 如权利要求1至7中任一项所述的电池单体，其中，所述第一焊接段的焊点的直径与所述第二焊接段的焊点的直径相等。
  9. 一种电池，包括权利要求1至8中任一项所述的电池单体。
  10. 一种用电装置，包括权利要求9所述的电池，所述电池用于提供电能。
  11. 一种焊接方法，用于将密封件焊接于物料，包括：
    在进行密封件焊接时，控制连续激光器发出连续激光形成所述密封件的第一焊接段；
    在所述连续激光器焊接完成后，控制脉冲激光器发出脉冲激光形成所述密封件的第二焊接段，至少部分所述第一焊接段与至少部分所述第二焊接段共同围合形成环绕所述密封件的环形焊缝。
  12. 如权利要求11所述的焊接方法，其中，所述焊接方法还包括：
    在控制所述连续激光器发出连续激光形成所述密封件的第一焊接段时，同时控制所述脉冲激光器发出脉冲激光形成前一密封件的第二焊接段。
  13. 如权利要求12所述的焊接方法，其中，所述连续激光器焊接所述密封件的所述第一焊接段的焊接用时等于所述脉冲激光器焊接前一密封件的第二焊接段的焊接用时。
  14. 如权利要求11至13中任一项所述的焊接方法，其中，在所述连续激光器焊接完成后，所述脉冲激光器焊接前，所述密封件与所述物料之间未焊接的区域的长度大于或等于1mm。
  15. 如权利要求11至14中任一项所述的焊接方法，其中，所述在所述连续激光器焊接完成后，控制脉冲激光器发出脉冲激光形成所述密封件的第二焊接段，包括：
    在所述连续激光器焊接完成后，间隔预设时间控制脉冲激光器发出脉冲激光形成所述密封件的第二焊接段。
  16. 如权利要求11至15中任一项所述的焊接方法，其中，所述连续激光为调制连续激光，所述脉冲激光为YAG脉冲激光。
  17. 如权利要求11至16中任一项所述的焊接方法，其中，所述连续激光器的焊接速度与焊接频率的比值等于所述脉冲激光器的焊接速度与焊接频率的比值。
  18. 如权利要求11至17中任一项所述的焊接方法，其中，所述连续激光器与所述脉冲激光器发出的单点能量相等。
  19. 一种焊接设备，其中，所述焊接设备包括：
    载台，用于放置密封件和物料；
    焊接平台，所述焊接平台与所述载台对应设置，所述焊接平台上分别设置连续激光器和脉冲激光器，所述连续激光器用于向所述密封件与所述物料之间形成第一焊接段，所述脉冲激光器用于向所述密封件和所述物料之间形成第二焊接段，至少部分所述第一焊接段与至少部分所述第二焊接段共同围合形成环绕所述密封件的环形焊缝。
  20. 如权利要求19所述的焊接设备，其中，所述载台被配置为可旋转，以使所述密封件和所述物料在所述连续激光器和所述脉冲激光器之间切换。
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* Cited by examiner, † Cited by third party
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