WO2024055292A1 - 焊接方法、电池单体、电池和用电设备 - Google Patents

焊接方法、电池单体、电池和用电设备 Download PDF

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Publication number
WO2024055292A1
WO2024055292A1 PCT/CN2022/119339 CN2022119339W WO2024055292A1 WO 2024055292 A1 WO2024055292 A1 WO 2024055292A1 CN 2022119339 W CN2022119339 W CN 2022119339W WO 2024055292 A1 WO2024055292 A1 WO 2024055292A1
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WIPO (PCT)
Prior art keywords
welding
section
battery
gap
housing
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/CN2022/119339
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English (en)
French (fr)
Inventor
吴凯
罗海京
张婷婷
瞿飞
何佳宁
刘春旭
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Contemporary Amperex Technology Co Ltd
Original Assignee
Contemporary Amperex Technology Co Ltd
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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Publication date
Application filed by Contemporary Amperex Technology Co Ltd filed Critical Contemporary Amperex Technology Co Ltd
Priority to PCT/CN2022/119339 priority Critical patent/WO2024055292A1/zh
Priority to CN202280005909.9A priority patent/CN118056320A/zh
Publication of WO2024055292A1 publication Critical patent/WO2024055292A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
    • H01M50/169—Lids or covers characterised by the methods of assembling casings with lids by welding, brazing or soldering
    • 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

Definitions

  • This application relates to the field of battery technology, and in particular to a welding method, battery cells, batteries and electrical equipment.
  • Embodiments of the present application provide a welding method, battery cells, batteries and electrical equipment, which can improve the safety of batteries.
  • a welding method for welding an end cover and a casing of a battery cell.
  • the welding method includes: starting from a first position on the surface of the end cover and continuously welding to the end cover. a second position of the gap between the end cover and the housing to form a first pre-welded section; welding is performed from the second position along the gap to form a third pre-welded section connected to the first pre-welded section. 2. Pre-welding section.
  • the welding method provided by the embodiment of the present application is used to weld the end cover and the casing of the battery cell. Welding starts from the first position on the surface of the end cap and is continuously welded to the second position of the gap between the end cap and the shell, thereby forming a first pre-welded section; then, welding is performed along the gap from the second position to A second pre-welded section is formed connected to the first pre-welded section.
  • the pre-welding starting point is selected at the first position on the surface of the end cover to avoid the welding light source passing through the end cover at the beginning of pre-welding.
  • the gap between the cover and the casing is injected into the casing, causing damage to the electrode assembly in the casing, thereby improving the safety of the battery.
  • the second pre-welding section is formed by welding along the gap from the second position, which can relatively fix the positions of the end cover and the casing to facilitate further welding and connection of the end cover and the casing.
  • the angle between the first pre-welding section and the second pre-welding section is an obtuse angle.
  • the angle is 135° ⁇ 165°.
  • the angle between the first pre-welding section and the second pre-welding section is set to 135° ⁇ 165°.
  • the length of the second pre-welding section is 3 mm to 5 mm.
  • the length of the second pre-welding section is too small, making it difficult to relatively fix the end cover and the shell; the length of the second pre-welding section is too large, resulting in a waste of material in the pre-welding process and increasing production costs. Therefore, the length of the second pre-welding section is set to 3 mm to 5 mm.
  • the minimum distance from the first position to the gap is 0.3 mm to 3 mm.
  • the minimum distance from the first position to the gap that is, the vertical distance. If the distance is too small, a slight improper operation during the welding process will cause the welding light source to enter the housing and damage the electrode assembly; when the distance is too large, the first welding section will The length will become correspondingly larger, causing material waste in the pre-welding process and increasing production costs. Therefore, the minimum distance from the first position to the gap is set to 0.3 mm to 3 mm.
  • the first pre-welding section and the second pre-welding section form a pre-welding area
  • the method further includes: after forming at least one of the pre-welding areas, from at least one The second pre-welding section of one of the pre-welding areas is welded along the gap to weld the end cap and the shell.
  • the gap between the end cover and the case is completely welded and sealed to prevent external impurities from entering the case and affecting the performance of the battery cell; the end cover and the case are also more firmly connected, improving the structural stability of the battery cell.
  • a battery cell including: an electrode assembly; a housing having an opening for accommodating the electrode assembly; and an end cover, the end cover being welded and connected to the housing to close the Opening; wherein, the surface of the end cap away from the housing has a first pre-welding section, and the connection between the end cap and the housing has a welding area connected to the first pre-welding section.
  • the minimum distance from an end of the first pre-welding section away from the welding zone to the welding zone is 0.3 mm to 3 mm.
  • a battery including: the battery cell in the above second aspect or any possible implementation of the second aspect.
  • an electrical device including: the battery in the above third aspect or any possible implementation of the third aspect, where the battery is used to provide electrical energy.
  • This application provides a welding method for welding the end caps and casings of battery cells. Welding starts from the first position on the surface of the end cap and is continuously welded to the second position of the gap between the end cap and the shell, thereby forming a first pre-welded section; then, welding is performed along the gap from the second position to A second pre-welded section is formed connected to the first pre-welded section.
  • the pre-welding starting point is selected at the first position on the surface of the end cover to avoid the welding light source passing through the end cover at the beginning of pre-welding.
  • the gap between the cover and the casing is injected into the casing, causing damage to the electrode assembly in the casing, thereby improving the safety of the battery.
  • the second pre-welding section is formed by welding along the gap from the second position, which can relatively fix the positions of the end cover and the casing to facilitate further welding and connection of the end cover and the casing.
  • Figure 1 is a schematic structural diagram of a vehicle disclosed in an embodiment of the present application.
  • Figure 2 is a schematic diagram of an exploded structure of a battery disclosed in an embodiment of the present application.
  • Figure 3 is a schematic structural diagram of a battery cell disclosed in an embodiment of the present application.
  • Figure 4 is a schematic flow chart of a welding method disclosed in an embodiment of the present application.
  • Figure 5 is a partial structural schematic diagram of an end cover and a housing disclosed in an embodiment of the present application.
  • Figure 6 is an enlarged view of part A in Figure 5;
  • Figure 7 is a schematic diagram of a pre-welding area disclosed in an embodiment of the present application.
  • Figure 8 is a top view of a battery cell disclosed in an embodiment of the present application.
  • Electrode assembly 22 Housing 21, electrode assembly 22, accommodation space 23, end cover 24, electrode terminal 241, positive electrode terminal 241a, negative electrode terminal 241b, connecting member 25, first tab 221a, second tab 222a;
  • Gap 26 first position 301, second position 302, first pre-welding section 303, second pre-welding section 304, welding area 305.
  • an embodiment means that a particular feature, structure or characteristic described in connection with the embodiment may be included in at least one embodiment of the application.
  • the appearances of this phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.
  • the battery cells may include lithium ion secondary batteries, lithium ion primary batteries, lithium-sulfur batteries, sodium lithium ion batteries, sodium ion batteries or magnesium ion batteries, etc., which are not limited in the embodiments of this application.
  • the battery cell may be in the shape of a cylinder, a flat body, a rectangular parallelepiped or other shapes, and the embodiments of the present application are not limited to this.
  • Battery cells are generally divided into three types according to packaging methods: cylindrical battery cells, rectangular battery cells and soft-pack battery cells, and the embodiments of the present application are not limited to this.
  • a battery refers to a physical module that includes one or more battery cells to provide electrical energy.
  • the battery mentioned in this application may include a battery module or a battery pack.
  • Batteries generally include a box for packaging one or more battery cells. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.
  • Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles and electric cars, as well as in many fields such as military equipment and aerospace. . As the application fields of power batteries continue to expand, their market demand is also constantly expanding.
  • the pre-welding starting point is selected in the gap between the end caps and the casing. at. In this way, at the beginning of pre-welding and before a large molten pool is formed to cover the gap, the welding light source will be emitted into the interior of the casing through the gap, causing damage to the electrode components of the battery cells and affecting the safety of the battery.
  • embodiments of the present application provide a welding method for welding the end caps and casings of battery cells. Welding starts from the first position on the surface of the end cap and is continuously welded to the second position of the gap between the end cap and the shell, thereby forming a first pre-welded section; then, welding is performed along the gap from the second position to A second pre-welded section is formed connected to the first pre-welded section.
  • the pre-welding starting point is selected at the first position on the surface of the end cover to avoid the welding light source passing through the end cover at the beginning of pre-welding.
  • the gap between the cover and the casing is injected into the casing, causing damage to the electrode assembly in the casing, thereby improving the safety of the battery.
  • the second pre-welding section is formed by welding along the gap from the second position, which can relatively fix the positions of the end cover and the casing to facilitate further welding and connection of the end cover and the casing.
  • batteries such as mobile phones, portable devices, laptops, battery cars, electric toys, electric tools, electric vehicles, ships and spacecraft, etc.
  • spacecraft include Airplanes, rockets, space shuttles and spacecraft, etc.
  • FIG. 1 it is a schematic structural diagram of a vehicle 1 according to an embodiment of the present application.
  • the vehicle 1 can be a fuel vehicle, a gas vehicle or a new energy vehicle.
  • the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or a new energy vehicle. Extended range vehicles, etc.
  • a motor 40 , a controller 30 and a battery 10 may be disposed inside the vehicle 1 .
  • the controller 30 is used to control the battery 10 to provide power to the motor 40 .
  • the battery 10 may be disposed at the bottom, front or rear of the vehicle 1 .
  • the battery 10 can be used to supply power to the vehicle 1 .
  • the battery 10 can be used as an operating power source of the vehicle 1 and used in the circuit system of the vehicle 1 , for example, to meet the power requirements for starting, navigation, and operation of the vehicle 1 .
  • the battery 10 can not only be used as an operating power source of the vehicle 1 , but also can be used as a driving power source of the vehicle 1 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1 .
  • the battery 10 may include multiple battery cells.
  • FIG. 2 it is a schematic structural diagram of a battery 10 according to an embodiment of the present application.
  • the battery 10 may include a plurality of battery cells 20 .
  • the battery 10 may also include a box 11.
  • the inside of the box 11 is a hollow structure, and a plurality of battery cells 20 are accommodated in the box 11.
  • a plurality of battery cells 20 are connected in parallel or in series or in a mixed combination and then placed in the box 11 .
  • the battery 10 may also include other structures, which will not be described in detail here.
  • the battery 10 may further include a bus component, which is used to realize electrical connections between multiple battery cells 20, such as parallel connection, series connection, or mixed connection.
  • the bus component can realize electrical connection between the battery cells 20 by connecting the electrode terminals of the battery cells 20 .
  • the bus part may be fixed to the electrode terminal of the battery cell 20 by welding. The electric energy of the plurality of battery cells 20 can be further drawn out through the box through the conductive mechanism.
  • the electrically conductive means can also be part of the busbar.
  • the number of battery cells 20 can be set to any value. Multiple battery cells 20 can be connected in series, parallel or mixed connection to achieve larger capacity or power. Since the number of battery cells 20 included in each battery 10 may be large, in order to facilitate installation, the battery cells 20 may be arranged in groups, and each group of battery cells 20 forms a battery module. The number of battery cells 20 included in the battery module is not limited and can be set according to requirements.
  • the battery may include multiple battery modules, which may be connected in series, parallel or mixed connection.
  • FIG. 3 it is a schematic structural diagram of a battery cell 20 according to an embodiment of the present application.
  • the battery cell 20 includes one or more electrode assemblies 22 , a casing 21 and an end cap 24 .
  • Housing 21 and end cap 24 form a housing or battery case.
  • the wall of the casing 21 and the end cover 24 are both called the wall of the battery cell 20.
  • the wall of the casing 21 includes a bottom wall and four side walls, and the bottom wall and the four side walls are connected.
  • An accommodating space 23 is formed in which the electrode assembly 22 is placed.
  • the housing 21 is determined according to the combined shape of one or more electrode assemblies 22.
  • the housing 21 can be a hollow rectangular parallelepiped, a cube, or a cylinder, and one surface of the housing 21 has an opening to accommodate one or more electrodes.
  • Component 22 may be placed within housing 21 .
  • one of the planes of the housing 21 is an open surface, that is, the plane does not have a wall so that the inside and outside of the housing 21 are connected.
  • the housing 21 can be a hollow cylinder, the end surface of the housing 21 is an open surface, that is, the end surface does not have a wall so that the inside and outside of the housing 21 are connected.
  • the end cap 24 covers the opening of the accommodation space 23 and is connected with the housing 21 to form a closed cavity in which the electrode assembly 22 is placed.
  • the housing 21 is filled with electrolyte, such as electrolyte solution.
  • the battery cell 20 may further include two electrode terminals 241 , and the two electrode terminals 241 may be disposed on the end cover 24 .
  • the end cap 24 is usually in the shape of a flat plate, and two electrode terminals 241 are fixed on the flat surface of the end cap 24.
  • the two electrode terminals 241 are respectively a positive electrode terminal 241a and a negative electrode terminal 241b.
  • Each electrode terminal 241 is provided with a corresponding connecting member 25 , which may also be called a current collecting member 25 . It is located between the end cover 24 and the electrode assembly 22 and is used to electrically connect the electrode assembly 22 and the electrode terminal 241 .
  • each electrode assembly 22 has a first tab 221a and a second tab 222a.
  • the first tab 221a and the second tab 222a have opposite polarities.
  • the first tab 221a is a positive tab
  • the second tab 222a is a negative tab.
  • the first tab 221a of one or more electrode assemblies 22 is connected to one electrode terminal through one connecting member 25, and the second tab 222a of one or more electrode assemblies 22 is connected to another electrode terminal through another connecting member 25.
  • the positive electrode terminal 241a is connected to the positive electrode tab through one connecting member 25, and the negative electrode terminal 241b is connected to the negative electrode tab through the other connecting member 25.
  • the electrode assembly 22 can be provided as a single or multiple electrode components according to actual usage requirements. As shown in FIG. 3 , the battery cell 20 is provided with four independent electrode assemblies 22 .
  • the end cap 24 and the casing 21 of the battery cell 20 are usually connected by welding. Below, the welding method provided by the embodiment of the present application will be described in detail with reference to the accompanying drawings.
  • FIG 4 is a schematic flow chart of a welding method 400 of the present application.
  • the welding method 400 is used to weld the end cover and the casing of a battery cell.
  • the battery cell can be the above-mentioned battery cell 20.
  • the welding method 400 includes:
  • welding starts from the first position 301 on the surface of the end cap 24 and is continuously welded to the second position 302 of the gap 26 between the end cap 24 and the housing 21 , thereby forming the first pre-welding section 303 ;
  • Welding is performed from the second position 302 along the gap 26 to form a second pre-weld section 304 connected to the first pre-weld section 303.
  • welding starts from the first position 301 on the surface of the end cap 24 and is continuously welded to the second position 302 of the gap 26 between the end cap 24 and the housing 21 , thereby forming the first pre-welding section. 303; Then, weld along the gap 26 from the second position 302 to form a second pre-weld section 304 connected to the first pre-weld section 303.
  • the pre-welding starting point is selected at the first position 301 on the surface of the end cover 24, so as to avoid the welding at the beginning of the pre-welding.
  • the welding light source is injected into the casing 21 through the gap 26 between the end cover 24 and the casing 21, causing damage to the electrode assembly in the casing 21, thereby improving the safety of the battery 10.
  • Welding starts from the first position 301 and continues to the second position 302.
  • a large enough molten pool has been formed to cover the gap 26 at the second position 302, so from the second position 302 302 along the gap 26 will not cause the laser to enter the housing 21 through the gap 26; welding from the second position 302 along the gap 26 to form the second pre-weld section 304 can adjust the position of the end cover 24 and the housing 21
  • the relative fixation facilitates further welding connection between the end cover 24 and the housing 21 .
  • the angle ⁇ between the first pre-welding section 303 and the second pre-welding section 304 is an obtuse angle.
  • the first pre-welding section 303 can be a straight line segment or a curved section.
  • the angle ⁇ between the first pre-welding section 303 and the second pre-welding section 304 is Then it is the angle between the tangent line of the curve section of the first pre-welding section 303 at the connection point between the first pre-welding section 303 and the second pre-welding section 304 and the second pre-welding section 304 .
  • the angle ⁇ between the first pre-welding section 303 and the second pre-welding section 304 is 135° ⁇ 165°.
  • the angle ⁇ between the first pre-welding section 303 and the second pre-welding section 304 is set to 135° ⁇ 165°.
  • the length L1 of the second pre-welding section 304 is 3 mm to 5 mm, and the length direction of the second pre-welding section 304 may be the y direction in FIG. 6 .
  • the length of the second pre-welding section 304 is too small, making it difficult to relatively fix the end cover 24 and the housing 21; the length of the second pre-welding section 304 is too large, resulting in a waste of material in the pre-welding process and increasing production costs. Therefore, the length of the second pre-welding section 304 is set to 3 mm to 5 mm.
  • the minimum distance L2 from the first position to the gap 26 is 0.3 mm to 3 mm.
  • the surface material of the end cap 24 will melt at high temperature, and then solidify again to form a molten pool, that is, the first welding section 303.
  • the generated molten pool has a certain width.
  • a molten pool will be formed on the end cap 24 extending to both sides of the first position in a direction perpendicular to the first welding section 303 with the first position as the center.
  • the first position in Figure 6 is point B shown.
  • the minimum distance L2 from the first position to the gap 26 is the vertical distance from point B to the gap 26 .
  • the x direction in FIG. 6 is the direction perpendicular to the gap 26 .
  • the first pre-welding section 303 can be in the shape as shown in Figure 7, and the first position can also be point C in Figure 7.
  • the minimum distance L2 from the first position to the gap 26 is from point C to the gap 26. vertical distance.
  • the x direction in FIG. 7 is the direction perpendicular to the gap 26 .
  • the minimum distance from the first position to the gap 26 is the vertical distance. If the distance is too small, a slight improper operation during the welding process will cause the welding light source to enter the housing 21 and damage the electrode assembly; when the distance is too large, the first The length of the welding section will increase accordingly, resulting in a waste of material in the pre-welding process and increasing production costs. Therefore, the minimum distance from the first position to the gap 26 is set to 0.3 mm to 3 mm.
  • the first pre-welding section 303 and the second pre-welding section 304 form a pre-welding area.
  • at least one pre-welding area needs to be formed by welding. Fix the positions of the end cover 24 and the housing 21 relatively, as shown in Figure 5.
  • the welding method further includes: after forming at least one pre-welding zone, welding along the gap 26 from the second pre-welding section 304 of one of the at least one pre-welding zone, The end cover 24 and the housing 21 are welded together.
  • welding is performed along the gap 26 from the second pre-welding section 304 of the pre-welding zone; when multiple pre-welding zones are set, welding can be performed from any one of the multiple pre-welding zones.
  • the second pre-welding section 304 of the pre-welding area is welded along the gap 26 to form a welding area 305 as shown in FIG.
  • the ends of the four side walls are all connected, thereby connecting the end cap 24 and the housing 21 .
  • the gap 26 between the end cover 24 and the case 21 is completely welded and sealed to prevent external impurities from entering the case 21 and affecting the performance of the battery cell 20; the end cover 24 and the case 21 are also more firmly connected, improving the battery quality. Structural stability of monomer 20.
  • the width of the molten pool can be increased by increasing the power of the welding light source to ensure that the molten pool is sufficient to cover the gap 26 between the end cover 24 and the housing 21 .
  • the welding light source is injected into the housing 21 through the gap 26 and damages the electrode assembly, and on the other hand, the sealing and firmness of the welding connection between the end cover 24 and the housing 21 are ensured.
  • the laser power is increased by 0.8KW, and the corresponding molten pool width can be increased by 0.09mm.
  • the laser power can be adjusted according to product needs.
  • the welding method further includes: removing welding slag generated by welding during the welding process. This is to prevent the welding slag from adsorbing on the end cover 24 or the casing 21 , to prevent the welding slag from piercing the insulating film covering the outer shell of the battery cell 20 during the subsequent assembly process of the battery 10 , and to prevent the welding slag from affecting the safety of the battery 10 .
  • the embodiment of the present application also provides a battery cell 20, as shown in Figure 8, including an electrode assembly (not shown in the figure), a casing 21 and an end cover 24; the casing 21 has an opening for accommodating the electrode assembly. ;
  • the end cap 24 is welded to the shell 21 to close the opening of the shell; wherein, the end cap 24 has a first pre-welded section 303 on the surface away from the shell 21, and the connection between the end cap 24 and the shell 21 has A welding area 305 connected to the first pre-welding section 303 .
  • the battery cell 20 provided in this embodiment, the end cover 24 and the case 21 are welded and connected, and the structure is firm and stable. During the welding process, the welding light source will not penetrate into the case and damage the electrode components, thereby improving the safety of the battery 10 .
  • the minimum distance L2' from the end of the first pre-welding section 303 away from the welding area 305 to the welding area 305 is 0.3 mm to 3 mm.
  • the minimum distance L2' described here from the end of the first pre-welding section 303 away from the welding area 305 to the welding area 305 is the above-mentioned minimum distance L2 from the first position to the gap 26.
  • L2 minimum distance from the first position to the gap 26.
  • the embodiment of the present application also provides an electric device, including the battery 10 in the above embodiment.
  • the battery 10 is used to provide electric energy.
  • the electric device can be a vehicle 1, a ship or a spacecraft, but this invention The application examples do not limit this.

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Abstract

本申请实施例提供一种焊接方法，电池单体、电池和用电设备。该焊接方法用于焊接电池单体的端盖和壳体，焊接方法包括：从端盖的表面的第一位置开始焊接，并连续焊接至端盖和壳体之间的间隙的第二位置，以形成第一预焊段；从第二位置沿间隙进行焊接，以形成与第一预焊段连接的第二预焊段。本申请的技术方案，能够提高电池的安全性。

Description

焊接方法、电池单体、电池和用电设备 技术领域
本申请涉及电池技术领域，特别是涉及一种焊接方法、电池单体、电池和用电设备。
背景技术
节能减排是汽车产业可持续发展的关键。在这种情况下，电动车辆由于其节能环保的优势成为汽车产业可持续发展的重要组成部分。而对于电动车辆而言，电池技术又是关乎其发展的一项重要因素。
在电池技术的发展中，除了提高电池的性能外，安全问题也是一个不可忽视的问题。如果电池的安全问题不能保证，那该电池就无法使用。因此，如何增强电池的安全性，是电池技术中一个亟待解决的技术问题。
发明内容
本申请实施例提供了一种焊接方法、电池单体、电池和用电设备，能够提高电池的安全性。
第一方面，提供了一种焊接方法，用于焊接电池单体的端盖和壳体，所述焊接方法包括：从所述端盖的表面的第一位置开始焊接，并连续焊接至所述端盖和所述壳体之间的间隙的第二位置，以形成第一预焊段；从所述第二位置沿所述间隙进行焊接，以形成与所述第一预焊段连接的第二预焊段。
本申请实施例提供的焊接方法，用于焊接电池单体的端盖和壳体。从端盖的表面的第一位置开始焊接，并连续焊接至端盖和壳体之间的间隙 的第二位置，从而形成第一预焊段；接着，从第二位置沿间隙进行焊接，以形成与第一预焊段连接的第二预焊段。本申请技术方案中，在电池单体的端盖和壳体的焊接连接过程中，将预焊起始点选取在端盖的表面的第一位置，避免在预焊刚开始时，焊接光源通过端盖和壳体之间的间隙射入壳体内，而造成对壳体内的电极组件的损伤，从而提高了电池的安全性。从第一位置开始焊接，并连续焊接至第二位置，当焊接至第二位置时，已形成足够大的熔池，可以覆盖第二位置处的间隙，因此从第二位置沿间隙焊接也不会发生激光通过间隙射入壳体内的情况；从第二位置沿间隙焊接形成第二预焊段，可以将端盖和壳体的位置相对固定，便于后续端盖和壳体的进一步焊接连接。
在一种可能实现的方式中，所述第一预焊段与所述第二预焊段之间的角度为钝角。
这样，当从第一位置焊接至第二位置后，不需要大幅度改变焊接的方向来焊接形成第二预焊段，保证在第二位置处焊接的连续性，避免影响焊接效果。
在一种可能实现的方式中，所述角度为135°～165°。
当角度过大时，第一位置很接近间隙，焊接过程中稍微操作不当便会造成焊接光源射入壳体内，损坏电极组件；当角度过小时，在第二位置需要大幅度改变焊接的方向来焊接形成第二预焊段，影响在第二位置处焊接的连续性。因此设置第一预焊段与第二预焊段之间的角度为135°～165°。
在一种可能实现的方式中，所述第二预焊段的长度为3mm～5mm。
第二预焊段的长度太小，不易将端盖和壳体相对固定；第二预焊段的长度太大，造成预焊过程的材料浪费，提高了生产成本。因此设置第二预焊段的长度为3mm～5mm。
在一种可能实现的方式中，所述第一位置到所述间隙的最小距离为0.3mm～3mm。
第一位置到间隙的最小距离，也就是垂直距离，该距离太小时，焊接过程中稍微操作不当便会造成焊接光源射入壳体内，损坏电极组件；该距离太大时，第一焊接段的长度就会相应变大，造成预焊过程的材料浪费，提高了生产成本。因此设置第一位置到间隙的最小距离为0.3mm～3mm。
在一种可能实现的方式中，所述第一预焊段和所述第二预焊段形成一个预焊区，所述方法还包括：在形成至少一个所述预焊区后，从至少一个所述预焊区中的一个所述预焊区的所述第二预焊段沿所述间隙进行焊接，以将所述端盖和所述壳体焊接连接。
这样，端盖和壳体之间的间隙就被全部焊接密封，防止外界杂质进入壳体内而影响电池单体性能；端盖和壳体也更加牢固连接，提高电池单体的结构稳定性。
第二方面，提供了一种电池单体，包括：电极组件；壳体，具有开口，用于容纳所述电极组件；端盖，所述端盖与所述壳体焊接连接，以封闭所述开口；其中，所述端盖的远离所述壳体的表面上具有第一预焊段，所述端盖与所述壳体的连接处具有与所述第一预焊段连接的焊接区。
在一种可能实现的方式中，所述第一预焊段的远离所述焊接区的一端到所述焊接区的最小距离为0.3mm～3mm。
第三方面，提供了一种电池，包括：上述第二方面或第二方面的任意可能的实现方式中的电池单体。
第四方面，提供了一种用电设备，包括：上述第三方面或第三方面的任意可能的实现方式中的电池，所述电池用于提供电能。
本申请提供了一种焊接方法，用于焊接电池单体的端盖和壳体。 从端盖的表面的第一位置开始焊接，并连续焊接至端盖和壳体之间的间隙的第二位置，从而形成第一预焊段；接着，从第二位置沿间隙进行焊接，以形成与第一预焊段连接的第二预焊段。本申请技术方案中，在电池单体的端盖和壳体的焊接连接过程中，将预焊起始点选取在端盖的表面的第一位置，避免在预焊刚开始时，焊接光源通过端盖和壳体之间的间隙射入壳体内，而造成对壳体内的电极组件的损伤，从而提高了电池的安全性。从第一位置开始焊接，并连续焊接至第二位置，当焊接至第二位置时，已形成足够大的熔池，可以覆盖第二位置处的间隙，因此从第二位置沿间隙焊接也不会发生激光通过间隙射入壳体内的情况；从第二位置沿间隙焊接形成第二预焊段，可以将端盖和壳体的位置相对固定，便于后续端盖和壳体的进一步焊接连接。
附图说明
为了更清楚地说明本申请实施例的技术方案，下面将对本申请实施例中所需要使用的附图作简单地介绍，显而易见地，下面所描述的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据附图获得其他的附图。
图1是本申请一实施例公开的一种车辆的结构示意图；
图2是本申请一实施例公开的一种电池的分解结构示意图；
图3是本申请一实施例公开的一种电池单体的结构示意图；
图4是本申请一实施例公开的一种焊接方法的示意性流程图；
图5是本申请一实施例公开的一种端盖和壳体的局部结构示意图；
图6是图5中A部分的放大图；
图7是本申请一实施例公开的一种预焊区的示意图；
图8是本申请一实施例公开的一种电池单体的俯视图。
在附图中，附图并未按照实际的比例绘制。
附图标记说明：
车辆1；
电池10，控制器30，马达40；
电池单体20，箱体11；
壳体21，电极组件22，容纳空间23，端盖24，电极端子241，正电极端子241a，负电极端子241b，连接构件25，第一极耳221a，第二极耳222a；
间隙26，第一位置301，第二位置302，第一预焊段303，第二预焊段304，焊接区305。
具体实施方式
下面结合附图和实施例对本申请的实施方式作进一步详细描述。以下实施例的详细描述和附图用于示例性地说明本申请的原理，但不能用来限制本申请的范围，即本申请不限于所描述的实施例。
在本申请的描述中，需要说明的是，除非另有说明，“多个”的含义是两个以上；术语“上”、“下”、“左”、“右”、“内”、“外”等指示的方位或位置关系仅是为了便于描述本申请和简化描述，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的限制。此外，术语“第一”、“第二”、“第三”等仅用于描述目的，而不能理解为指示或暗示相对重要性。“垂直”并不是严格意义上的垂直，而是在误差允许范围之内。“平行”并不是严格意义上的平行，而是在误差允许范围之内。
下述描述中出现的方位词均为图中示出的方向，并不是对本申请的具体结构进行限定。在本申请的描述中，还需要说明的是，除非另有明 确的规定和限定，术语“安装”、“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是直接相连，也可以通过中间媒介间接相连。对于本领域的普通技术人员而言，可视具体情况理解上述术语在本申请中的具体含义。
本申请中术语“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：存在A，同时存在A和B，存在B这三种情况。另外，本申请中字符“/”，一般表示前后关联对象是一种“或”的关系。
除非另有定义，本申请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；本申请中在申请的说明书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。本申请的说明书和权利要求书或上述附图中的术语“第一”、“第二”等是用于区别不同对象，而不是用于描述特定顺序或主次关系。
在本申请中提及“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，本申请所描述的实施例可以与其它实施例相结合。
本申请中，电池单体可以包括锂离子二次电池、锂离子一次电池、锂硫电池、钠锂离子电池、钠离子电池或镁离子电池等，本申请实施例对此并不限定。电池单体可呈圆柱体、扁平体、长方体或其它形状等，本申请实施例对此也不限定。电池单体一般按封装的方式分成三种：柱形电池单体、方体方形电池单体和软包电池单体，本申请实施例对此也不限定。
本申请中，电池是指包括一个或多个电池单体以提供电能的物理模块。例如，本申请中所提到的电池可以包括电池模块或电池包等。电池一般包括用于封装一个或多个电池单体的箱体。箱体可以避免液体或其他异物影响电池单体的充电或放电。
目前，从市场形势的发展来看，动力电池的应用越加广泛。动力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。随着动力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。
在电池技术的发展中，除了提高电池的性能外，安全问题也是一个不可忽视的问题。发明人发现，在电池单体的组装过程中，用焊接的方式连接电池单体的端盖和壳体时，在预焊过程中，预焊起始点选取在端盖和壳体之间的间隙处。这样，在预焊刚开始，还未形成大的熔池覆盖间隙时，焊接光源会通过间隙射入壳体内部，对电池单体的电极组件造成损伤，影响电池的安全性。
鉴于此，本申请实施例提供了一种焊接方法，用于焊接电池单体的端盖和壳体。从端盖的表面的第一位置开始焊接，并连续焊接至端盖和壳体之间的间隙的第二位置，从而形成第一预焊段；接着，从第二位置沿间隙进行焊接，以形成与第一预焊段连接的第二预焊段。本申请技术方案中，在电池单体的端盖和壳体的焊接连接过程中，将预焊起始点选取在端盖的表面的第一位置，避免在预焊刚开始时，焊接光源通过端盖和壳体之间的间隙射入壳体内，而造成对壳体内的电极组件的损伤，从而提高了电池的安全性。从第一位置开始焊接，并连续焊接至第二位置，当焊接至第二位置时，已形成足够大的熔池，可以覆盖第二位置处的间隙，因此从第二位置沿间隙焊接也不会发生激光通过间隙射入壳体内的情况；从第二位 置沿间隙焊接形成第二预焊段，可以将端盖和壳体的位置相对固定，便于后续端盖和壳体的进一步焊接连接。
本申请实施例描述的技术方案均适用于各种使用电池的装置，例如，手机、便携式设备、笔记本电脑、电瓶车、电动玩具、电动工具、电动车辆、船舶和航天器等，例如，航天器包括飞机、火箭、航天飞机和宇宙飞船等。
应理解，本申请实施例描述的技术方案不仅仅局限适用于上述所描述的设备，还可以适用于所有使用电池的设备，但为描述简洁，下述实施例均以电动车辆为例进行说明。
例如，如图1所示，为本申请一个实施例的一种车辆1的结构示意图，车辆1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1的内部可以设置马达40，控制器30以及电池10，控制器30用来控制电池10为马达40的供电。例如，在车辆1的底部或车头或车尾可以设置电池10。电池10可以用于车辆1的供电，例如，电池10可以作为车辆1的操作电源，用于车辆1的电路系统，例如，用于车辆1的启动、导航和运行时的工作用电需求。在本申请的另一实施例中，电池10不仅仅可以作为车辆1的操作电源，还可以作为车辆1的驱动电源，替代或部分地替代燃油或天然气为车辆1提供驱动动力。
为了满足不同的使用电力需求，电池10可以包括多个电池单体。例如，如图2所示，为本申请一个实施例的一种电池10的结构示意图，电池10可以包括多个电池单体20。电池10还可以包括箱体11，箱体11内部为中空结构，多个电池单体20容纳于箱体11内。例如，多个电池单体20相互并联或串联或混联组合后置于箱体11内。
可选地，电池10还可以包括其他结构，在此不再一一赘述。例 如，该电池10还可以包括汇流部件，汇流部件用于实现多个电池单体20之间的电连接，例如并联或串联或混联。具体地，汇流部件可通过连接电池单体20的电极端子实现电池单体20之间的电连接。进一步地，汇流部件可通过焊接固定于电池单体20的电极端子。多个电池单体20的电能可进一步通过导电机构穿过箱体而引出。可选地，导电机构也可属于汇流部件。
根据不同的电力需求，电池单体20的数量可以设置为任意数值。多个电池单体20可通过串联、并联或混联的方式连接以实现较大的容量或功率。由于每个电池10中包括的电池单体20的数量可能较多，为了便于安装，可以将电池单体20分组设置，每组电池单体20组成电池模块。电池模块中包括的电池单体20的数量不限，可以根据需求设置。电池可以包括多个电池模块，这些电池模块可通过串联、并联或混联的方式进行连接。
如图3所示，为本申请一个实施例的一种电池单体20的结构示意图，电池单体20包括一个或多个电极组件22、壳体21和端盖24。壳体21和端盖24形成外壳或电池盒。壳体21的壁以及端盖24均称为电池单体20的壁，其中对于长方体型电池单体20，壳体21的壁包括底壁和四个侧壁，底壁和四个侧壁连接形成放置电极组件22的容纳空间23。壳体21根据一个或多个电极组件22组合后的形状而定，例如，壳体21可以为中空的长方体或正方体或圆柱体，且壳体21的其中一个面具有开口以便一个或多个电极组件22可以放置于壳体21内。例如，当壳体21为中空的长方体或正方体时，壳体21的其中一个平面为开口面，即该平面不具有壁体而使得壳体21内外相通。当壳体21可以为中空的圆柱体时，壳体21的端面为开口面，即该端面不具有壁体而使得壳体21内外相通。端盖24覆盖容纳空间23的开口并且与壳体21连接，以形成放置电极组件22的封 闭的腔体。壳体21内填充有电解质，例如电解液。
该电池单体20还可以包括两个电极端子241，两个电极端子241可以设置在端盖24上。端盖24通常是平板形状，两个电极端子241固定在端盖24的平板面上，两个电极端子241分别为正电极端子241a和负电极端子241b。每个电极端子241各对应设置一个连接构件25，或者也可以称为集流构件25，其位于端盖24与电极组件22之间，用于将电极组件22和电极端子241实现电连接。
如图3所示，每个电极组件22具有第一极耳221a和第二极耳222a。第一极耳221a和第二极耳222a的极性相反。例如，当第一极耳221a为正极极耳时，第二极耳222a为负极极耳。一个或多个电极组件22的第一极耳221a通过一个连接构件25与一个电极端子连接，一个或多个电极组件22的第二极耳222a通过另一个连接构件25与另一个电极端子连接。例如，正电极端子241a通过一个连接构件25与正极极耳连接，负电极端子241b通过另一个连接构件25与负极极耳连接。
在该电池单体20中，根据实际使用需求，电极组件22可设置为单个，或多个，如图3所示，电池单体20内设置有4个独立的电极组件22。
电池单体20的端盖24和壳体21通常用焊接的方式进行连接，下面，将结合附图具体描述本申请实施例提供的焊接方法。
图4为本申请一种焊接方法400的示意性流程图。该焊接方法400用于焊接电池单体的端盖和壳体，该电池单体可以为上述的电池单体20，如图4所示，该焊接方法400包括：
401，从端盖的表面的第一位置开始焊接，并连续焊接至端盖和壳体之间的间隙的第二位置，以形成第一预焊段；
402，从第二位置沿间隙进行焊接，以形成与第一预焊段连接的 第二预焊段。
具体地，参照图5，从端盖24的表面的第一位置301开始焊接，连续焊接至端盖24和壳体21之间的间隙26的第二位置302，从而形成第一预焊段303；从第二位置302沿间隙26进行焊接，形成与第一预焊段303连接的第二预焊段304。
在本申请实施例中，从端盖24的表面的第一位置301开始焊接，并连续焊接至端盖24和壳体21之间的间隙26的第二位置302，从而形成第一预焊段303；接着，从第二位置302沿间隙26进行焊接，以形成与第一预焊段303连接的第二预焊段304。本申请技术方案中，在电池单体20的端盖24和壳体21的焊接连接过程中，将预焊起始点选取在端盖24的表面的第一位置301，避免在预焊刚开始时，焊接光源通过端盖24和壳体21之间的间隙26射入壳体21内，而造成对壳体21内的电极组件的损伤，从而提高了电池10的安全性。从第一位置301开始焊接，并连续焊接至第二位置302，当焊接至第二位置302时，已形成足够大的熔池，可以覆盖第二位置302处的间隙26，因此从第二位置302沿间隙26焊接也不会发生激光通过间隙26射入壳体21内的情况；从第二位置302沿间隙26焊接形成第二预焊段304，可以将端盖24和壳体21的位置相对固定，便于后续端盖24和壳体21的进一步焊接连接。
可选地，在本申请实施例中，如图5所示，第一预焊段303与第二预焊段304之间的角度α为钝角。
应理解，第一预焊段303可以为直线段，也可以为曲线段，当第一预焊段303为曲线段时，第一预焊段303与第二预焊段304之间的角度α则为第一预焊段303与第二预焊段304的连接处的第一预焊段303的曲线段的切线与第二预焊段304之间的角度。
这样，当从第一位置301焊接至第二位置302后，不需要大幅度 改变焊接的方向来焊接形成第二预焊段304，保证在第二位置302处焊接的连续性，避免影响焊接效果。
可选地，在本申请实施例中，第一预焊段303与第二预焊段304之间的角度α为135°～165°。
当角度α过大时，第一位置301很接近间隙26，焊接过程中稍微操作不当便会造成焊接光源射入壳体21内，损坏电极组件；当角度α过小时，在第二位置302需要大幅度改变焊接的方向来焊接形成第二预焊段304，影响在第二位置302处焊接的连续性。因此设置第一预焊段303与第二预焊段304之间的角度α为135°～165°。
可选地，在本申请实施例中，如图6所示，第二预焊段304的长度L1为3mm～5mm，第二预焊段304的长度方向可以为图6中的y方向。
第二预焊段304的长度太小，不易将端盖24和壳体21相对固定；第二预焊段304的长度太大，造成预焊过程的材料浪费，提高了生产成本。因此设置第二预焊段304的长度为3mm～5mm。
可选地，在本申请实施例中，继续参照图6，第一位置到间隙26的最小距离L2为0.3mm～3mm。
具体地，在焊接过程中，端盖24表面材料在高温下会熔化，然后再次凝固形成熔池，也就是第一焊接段303，产生的熔池具有一定宽度。比如，在第一位置焊接，会以第一位置为中心，在端盖24上沿垂直于第一焊接段303的方向，向第一位置的两侧延伸形成熔池。基于焊接的特性，图6中第一位置即为所示的B点。第一位置到间隙26的最小距离L2即为B点到间隙26的垂直距离。图6中的x方向即为垂直于间隙26的方向。可选地，第一预焊段303可以为如图7所示的形状，第一位置也可以是图7中的C点，第一位置到间隙26的最小距离L2即为C点到间隙26的垂直距离。图7中的x方向即为垂直于间隙26的方向。
第一位置到间隙26的最小距离，也就是垂直距离，该距离太小时，焊接过程中稍微操作不当便会造成焊接光源射入壳体21内，损坏电极组件；该距离太大时，第一焊接段的长度就会相应变大，造成预焊过程的材料浪费，提高了生产成本。因此设置第一位置到间隙26的最小距离为0.3mm～3mm。
在本申请实施例中，第一预焊段303和第二预焊段304形成一个预焊区，在焊接连接端盖24和壳体21的过程中，需要焊接形成至少一个预焊区，以将端盖24和壳体21的位置相对固定，如图5所示。
可选地，在本申请实施例中，焊接方法还包括：在形成至少一个预焊区后，从至少一个预焊区中的一个预焊区的第二预焊段304沿间隙26进行焊接，以将端盖24和壳体21焊接连接。
具体地，当设置一个预焊区时，则从该预焊区的第二预焊段304沿间隙26进行焊接；当设置多个预焊区时，可以从多个预焊区中的任意一个预焊区的第二预焊段304沿间隙26进行焊接，从而形成如图8所示的焊接区305，该焊接区305将间隙26全部覆盖，也就是端盖24的四周与壳体21的四个侧壁的端部全部连接，从而将端盖24和壳体21连接。
这样，端盖24和壳体21之间的间隙26就被全部焊接密封，防止外界杂质进入壳体21内而影响电池单体20性能；端盖24和壳体21也更加牢固连接，提高电池单体20的结构稳定性。
可选地，在本申请实施例中，可以通过增加焊接光源的功率，增大熔池宽度，保证熔池足以覆盖端盖24和壳体21之间的间隙26。一方面避免焊接光源通过间隙26射入壳体21内损伤电极组件，一方面保证端盖24和壳体21焊接连接的密封性和牢固稳定性。比如，使用激光作为焊接光源，激光功率增大0.8KW，相应的熔池宽度可增加0.09mm，实际焊接过程中，可根据产品需要，调节激光功率。
可选地，在本申请实施例中，焊接方法还包括：在焊接过程中，清除焊接产生的焊渣。以避免焊渣吸附于端盖24或壳体21上，避免在后续电池10组装过程中，焊渣刺破电池单体20外壳上包覆的绝缘膜，避免焊渣影响电池10的安全性。
本申请实施例还提供了一种电池单体20，如图8所示，包括电极组件(图中未示出)，壳体21和端盖24；壳体21具有开口，用于容纳电极组件；端盖24与壳体21焊接连接，以封闭壳体的开口；其中，端盖24的远离壳体21的表面上具有第一预焊段303，端盖24与壳体21的连接处具有与第一预焊段303连接的焊接区305。
本实施例提供的电池单体20，端盖24和壳体21焊接连接，结构牢固稳定，且在焊接过程中，焊接光源不会射入壳体内部损坏电极组件，提高电池10的安全性。
可选地，在本申请实施例中，第一预焊段303的远离焊接区305的一端到焊接区305的最小距离L2’为0.3mm～3mm。
此处所描述的第一预焊段303的远离焊接区305的一端到焊接区305的最小距离L2’即为上述的第一位置到间隙26的最小距离L2，具体可参考上述内容，此处不再赘述。
本申请实施例还提供了一种用电设备，包括上述实施例中的电池10，电池10用于提供电能，可选地，该用电设备可以为车辆1、船舶或航天器等，但本申请实施例对此并不限定。
虽然已经参考优选实施例对本申请进行了描述，但在不脱离本申请的范围的情况下，可以对其进行各种改进并且可以用等效物替换其中的部件。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 (10)

  1. 一种焊接方法，用于焊接电池单体的端盖和壳体，其特征在于，所述焊接方法包括：
    从所述端盖的表面的第一位置开始焊接，并连续焊接至所述端盖和所述壳体之间的间隙的第二位置，以形成第一预焊段；
    从所述第二位置沿所述间隙进行焊接，以形成与所述第一预焊段连接的第二预焊段。
  2. 根据权利要求1所述的焊接方法，其特征在于，所述第一预焊段与所述第二预焊段之间的角度为钝角。
  3. 根据权利要求2所述的焊接方法，其特征在于，所述角度为135°～165°。
  4. 根据权利要求1至3中任一项所述的焊接方法，其特征在于，所述第二预焊段的长度为3mm～5mm。
  5. 根据权利要求1至4中任一项所述的焊接方法，其特征在于，所述第一位置到所述间隙的最小距离为0.3mm～3mm。
  6. 根据权利要求1至5中任一项所述的焊接方法，其特征在于，所述第一预焊段和所述第二预焊段形成一个预焊区，所述方法还包括：
    在形成至少一个所述预焊区后，从至少一个所述预焊区中的一个所述预焊区的所述第二预焊段沿所述间隙进行焊接，以将所述端盖和所述壳体焊接连接。
  7. 一种电池单体，其特征在于，包括：
    电极组件；
    壳体，具有开口，用于容纳所述电极组件；
    端盖，所述端盖与所述壳体焊接连接，以封闭所述开口；
    其中，所述端盖的远离所述壳体的表面上具有第一预焊段，所述端盖与所述壳体的连接处具有与所述第一预焊段连接的焊接区。
  8. 根据权利要求7所述的电池单体，其特征在于，所述第一预焊段的远离所述焊接区的一端到所述焊接区的最小距离为0.3mm～3mm。
  9. 一种电池，其特征在于，包括根据权利要求7或8所述的电池单体。
  10. 一种用电设备，其特征在于，包括根据权利要求9所述的电池，所述电池用于提供电能。
PCT/CN2022/119339 2022-09-16 2022-09-16 焊接方法、电池单体、电池和用电设备 Ceased WO2024055292A1 (zh)

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