WO2007071121A1 - A welding method and a method of sealing opening of battery by laser - Google Patents

A welding method and a method of sealing opening of battery by laser Download PDF

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Publication number
WO2007071121A1
WO2007071121A1 PCT/CN2006/000062 CN2006000062W WO2007071121A1 WO 2007071121 A1 WO2007071121 A1 WO 2007071121A1 CN 2006000062 W CN2006000062 W CN 2006000062W WO 2007071121 A1 WO2007071121 A1 WO 2007071121A1
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WIPO (PCT)
Prior art keywords
welding
laser
battery
closed
gun
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PCT/CN2006/000062
Other languages
French (fr)
Chinese (zh)
Inventor
Fei Chao Wu
Hong Bo Lu
Original Assignee
Shenzhen Bak Battery Co., Ltd
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Application filed by Shenzhen Bak Battery Co., Ltd filed Critical Shenzhen Bak Battery Co., Ltd
Publication of WO2007071121A1 publication Critical patent/WO2007071121A1/en

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • 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
    • B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
    • B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
    • B23K26/062—Shaping the laser beam, e.g. by masks or multi-focusing by direct control of the laser beam
    • B23K26/0626—Energy control of the laser beam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/20—Bonding
    • B23K26/21—Bonding by welding
    • B23K26/24—Seam welding
    • B23K26/28—Seam welding of curved planar seams
    • B23K26/282—Seam welding of curved planar seams of tube sections
    • 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 of a single cell or a single battery
    • 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

  • the present invention relates to a soldering method, and more particularly to a laser sealing method for a battery.
  • lithium-ion batteries have high capacity, high energy density, high voltage, etc., and their market share in mobile phones, notebook computers, digital cameras and other products is rising.
  • the battery especially the positive electrode sheet, the negative electrode sheet and the electrolyte inside the lithium ion battery, the active material and the electrolyte on the positive and negative electrodes are easily reflected by air and water vapor, and therefore, the battery needs to be completely sealed.
  • the positive and negative electrodes of the battery, the electrolyte, and the separator are collectively housed in the battery case, and the battery case is sealed by the cover.
  • the battery case and the cover are connected by laser splicing.
  • Laser welding uses the focus of the laser beam to scan the area where the metal to be welded is in contact, and the high temperature causes the metal to be melted together.
  • the laser beam scans the gap line of the battery case and the cover plate to achieve the purpose of solder sealing.
  • the welding seal is completed.
  • the starting point position is not easy to control, the welding is not completely closed, and the sealing is not completely sealed.
  • the laser beam continues to scan a small distance along the original welding track to completely close the weld.
  • the laser focus forms a liquid phase metal and the center liquid vaporizes and ejects at a very high speed, emitting dazzling white light; at the same time, the high concentration gas moves the liquid metal to the edge of the bath, at the center of the bath A depression is formed.
  • the molten metal in the front melts back and fills the depressions generated later.
  • the molten pool at the end of the welding track 2 forms the pit 3 as shown in Fig. 4. This pit 3 seriously affects the tightness of the weld between the object 1 and the object 4.
  • the object of the present invention is to overcome the deficiencies of the prior art described above and to provide a welding method which can effectively improve the sealing performance of welding.
  • a welding method after the welding gun is melted and closed to the joint seam, the welding gun continues to move forward a distance, and at the same time, the flame intensity of the welding gun is gradually weakened until it is zero.
  • the welding torch is a laser welding torch. When the laser welding torch is melted and closed to the joint seam, the laser welding torch continues to move forward a distance, and the laser intensity is gradually weakened until it reaches zero. After the welding gun is melted and closed to the joint seam, the welding gun continues to move a distance away from the original welding trajectory.
  • a welding method for sealing a battery after the welding gun is melted and closed to the joint of the battery case and the cover plate, the welding gun continues to move forward by a distance, and at the same time, the flame intensity of the welding torch is gradually weakened until it is zero.
  • the welding gun After the welding gun is melted and closed to the joint seam, the welding gun continues to move a distance away from the original welding trajectory.
  • the direction deviating from the original welding track is the direction of the battery case or the direction of the cover.
  • the welding torch is a laser welding torch. When the laser spot of the laser welding torch is melted and closed to the joint seam, the laser spot continues to move forward by a distance, and the laser intensity is gradually weakened until it is zero.
  • the battery is a lithium ion battery.
  • the size of the molten pool at the end of the laser melting that is, the depth of the pit, can be effectively reduced by moving the welding torch forward a distance and gradually reducing the flame intensity of the welding torch. Get effective control. Through actual operation, it is shown that when the flame intensity is gradually weakened, it will be completed until it is zero. The depression formed by the molten pool at the end position of the welding trajectory is completely eliminated, and the sealing performance of the welding is greatly improved.
  • the trajectory offset welding seam at the welding receiving tail can make the end melting pool fall outside the weld seam. Avoid the adverse effects of pits on battery sealing performance.
  • Figure 1 is a schematic view of a conventional welding structure.
  • FIG. 2 is a schematic view showing the structure of a laser sealing structure of a cylindrical lithium ion battery of the present invention.
  • FIG. 3 is a schematic view showing the structure of a laser sealing structure of another cylindrical lithium ion battery of the present invention.
  • FIG. 4 is a schematic view showing a laser sealing structure of a prismatic lithium ion battery according to the present invention.
  • Embodiment 1 A laser sealing method for a cylindrical lithium ion battery, as shown in FIG. 2, includes the following steps:
  • the laser welding fixture drives the battery case 4 and the cover plate 1 to rotate, so that the center of the laser spot moves relative to the joint of the battery case 4 and the cover plate 1, and the laser will melt the connection to make the battery case 4 and the cover plate. 1 welding as one;
  • Embodiment 2 Another laser sealing method for a cylindrical lithium ion battery, as shown in FIG. 3, the difference between this embodiment and the first embodiment is that the end point of the ending track of the new welding track 3 does not fall on the battery case 4 Up, but falling on the cover 1, other aspects are the same as in the first embodiment.
  • Embodiment 3 is a laser sealing method for a prismatic lithium ion battery. As shown in FIG. 4, the difference between the embodiment and the second embodiment is that the shape of the battery is different.
  • the second embodiment is a cylindrical lithium ion battery, and the embodiment is a square. Lithium ion battery, other aspects are the same as the second embodiment.
  • the present invention is not limited to the sealing of a lithium ion battery, but also other types of batteries, and other occasions where a butt seal is required.
  • the present invention is not limited to laser welding seals, and other welding methods, such as gas welding, etc., may be employed, which are still within the scope of the present invention.

Abstract

The invention relates to a welding method. After the connection seam is closed and sealed, the welding gun continues to move forward a distance, at the same time, the energy of the gun beam is gradually decreased to zero. Moreover, after the connection seam is closed and sealed, the welding gun continually moves a distance in the direction of leaving the welding track. As a result, the invention provides a method that effectively eliminates the welding pit faults and advances the sealing performance of welding. Furthermore, the invention especially adapts to seal the opening of lithium battery for advancing the sealing performance by use of laser beam.

Description

一种焊接方法及对电池的激光封口方法  Welding method and laser sealing method for battery
技术领域 Technical field
本发明涉及一种焊接方法， 尤其涉及电池的激光封口方法。  The present invention relates to a soldering method, and more particularly to a laser sealing method for a battery.
背景技术 Background technique
近年来， 电脑、 通讯电子产品以及消费电子产品功能愈来愈强， 而其外形尺寸要 求愈来愈小， 所以， 高容量、 小尺寸的电池产品受到欢迎。 特别是锂离子电池， 其具 有容量大能量密度高、 电压高等特点， 在移动电话、 笔记本电脑、 数码相机等产品的 市场占有率不断上升。  In recent years, computers, communication electronics, and consumer electronics have become more and more powerful, and their external dimensions have become smaller and smaller. Therefore, high-capacity, small-sized battery products are welcome. In particular, lithium-ion batteries have high capacity, high energy density, high voltage, etc., and their market share in mobile phones, notebook computers, digital cameras and other products is rising.
电池、 特别是锂离子电池内部正极片、 负极片及电解质， 正负极片上的活性物质 和电解质易与空气、 水汽反映， 因此， 电池需完全密封。  The battery, especially the positive electrode sheet, the negative electrode sheet and the electrolyte inside the lithium ion battery, the active material and the electrolyte on the positive and negative electrodes are easily reflected by air and water vapor, and therefore, the battery needs to be completely sealed.
一般地， 电池的正负极片、 电解质、 隔膜共同收容于电池壳内， 并通过盖板将电 池壳封口。 通常电池壳与盖板是通过激光悍接连为一体的。 激光焊接是利用激光束的 焦点扫描待焊金属相接触的区域， 高温使金属熔融连接在一起。 在进行激光焊接电池 壳封口时， 激光束扫描电池壳与盖板相接触的间隙线， 达到焊接密封目的。 当激光束 扫描一周至回到扫描起始点时， 焊接密封完成， 然而在实际过程中由于该起始点位置 不易控制， 容易造成焊接未完全闭合， 导致封口未完全密封。 为了确保锂离子电池电 池壳的密封性， 激光束扫描一周回到扫描起始点后， 激光束沿原焊接轨迹往前继续扫 描微量距离， 以使焊缝完全闭合。  Generally, the positive and negative electrodes of the battery, the electrolyte, and the separator are collectively housed in the battery case, and the battery case is sealed by the cover. Usually, the battery case and the cover are connected by laser splicing. Laser welding uses the focus of the laser beam to scan the area where the metal to be welded is in contact, and the high temperature causes the metal to be melted together. When the laser-welded battery case is sealed, the laser beam scans the gap line of the battery case and the cover plate to achieve the purpose of solder sealing. When the laser beam is scanned for one week to return to the scanning start point, the welding seal is completed. However, in the actual process, since the starting point position is not easy to control, the welding is not completely closed, and the sealing is not completely sealed. In order to ensure the tightness of the lithium ion battery case, after the laser beam scans back to the scanning start point one week, the laser beam continues to scan a small distance along the original welding track to completely close the weld.
激光焊接时， 激光焦点形成液相金属并且中心液体气化， 并以极髙的速度喷射， 发出耀眼的白光； 与此同时， 高浓度气体使液相金属运动至熔池边缘， 在熔池中心形 成凹陷。 一般来说， 在焊接过程中， 由于前面熔化的液相金属会回流并填补后面产生 的凹陷。 但是， 当电池焊缝焊接完毕， 激光停止时， 由于没有后续熔化的液相金属填 补此凹陷， 在焊接轨迹 2的终点地熔池便形成如图 4所示的凹坑 3。 该凹坑 3严重影响了 物件 1与物件 4之间焊缝的密封性。  During laser welding, the laser focus forms a liquid phase metal and the center liquid vaporizes and ejects at a very high speed, emitting dazzling white light; at the same time, the high concentration gas moves the liquid metal to the edge of the bath, at the center of the bath A depression is formed. Generally, during the welding process, the molten metal in the front melts back and fills the depressions generated later. However, when the welding of the battery weld is completed and the laser is stopped, since the liquid metal is not subsequently melted to fill the depression, the molten pool at the end of the welding track 2 forms the pit 3 as shown in Fig. 4. This pit 3 seriously affects the tightness of the weld between the object 1 and the object 4.
以电池壳与电池盖板之间的悍缝密封为例， 统计分析表明： 凹坑处是电池密封的 最薄弱环节， 凹坑 3处漏气的电池约占电池总漏气的 90%左右， 严重影响了电池的焊接 质量。 Taking the quilting seal between the battery case and the battery cover as an example, statistical analysis shows that the pit is sealed by a battery. At the weakest point, the battery leaking at the pit 3 accounts for about 90% of the total leak of the battery, which seriously affects the welding quality of the battery.
发明内容 Summary of the invention
本发明的目的意在克服上述现有技术存在的不足， 提供一种能有效提高焊接的密 封性能的焊接方法。  SUMMARY OF THE INVENTION The object of the present invention is to overcome the deficiencies of the prior art described above and to provide a welding method which can effectively improve the sealing performance of welding.
进一步地， 本发明的目的是提供一种能有效提高电池激光封口密封性能的方法。 本发明是通过下述技术方案来实现的：  Further, it is an object of the present invention to provide a method for effectively improving the sealing performance of a battery laser seal. The present invention is achieved by the following technical solutions:
一种焊接方法， 当焊枪对连接缝熔融闭合完成后， 焊枪继续向前移动一段距离， 同时使焊枪的火焰强度逐渐减弱， 直至为零。 所述焊枪是激光焊枪， 当激光焊枪对连接缝熔融闭合完成后， 激光焊枪继续向前 移动一段距离， 同时使激光强度逐渐减弱， 直至为零。 当焊枪对连接缝熔融闭合完成后， 焊枪向偏离原焊接轨迹的方向继续移动一段距 离。 一种对电池封口的焊接方法， 当焊枪对电池壳与盖板的连接缝熔融闭合完成后， 焊枪继续向前移动一段距离， 同时使焊枪的火焰强度逐渐减弱， 直至为零。 当焊枪对连接缝熔融闭合完成后， 焊枪向偏离原焊接轨迹的方向继续移动一段距 离。 所述偏离原焊接轨迹的方向是电池壳的方向或者是盖板的方向。 所述焊枪是激光焊枪， 当激光焊枪的激光光斑对连接缝熔融闭合完成后， 激光光 斑继续向前移动一段距离， 同时使激光强度逐渐减弱， 直至为零。 所述电池是锂离子电池。  A welding method, after the welding gun is melted and closed to the joint seam, the welding gun continues to move forward a distance, and at the same time, the flame intensity of the welding gun is gradually weakened until it is zero. The welding torch is a laser welding torch. When the laser welding torch is melted and closed to the joint seam, the laser welding torch continues to move forward a distance, and the laser intensity is gradually weakened until it reaches zero. After the welding gun is melted and closed to the joint seam, the welding gun continues to move a distance away from the original welding trajectory. A welding method for sealing a battery, after the welding gun is melted and closed to the joint of the battery case and the cover plate, the welding gun continues to move forward by a distance, and at the same time, the flame intensity of the welding torch is gradually weakened until it is zero. After the welding gun is melted and closed to the joint seam, the welding gun continues to move a distance away from the original welding trajectory. The direction deviating from the original welding track is the direction of the battery case or the direction of the cover. The welding torch is a laser welding torch. When the laser spot of the laser welding torch is melted and closed to the joint seam, the laser spot continues to move forward by a distance, and the laser intensity is gradually weakened until it is zero. The battery is a lithium ion battery.
与现有技术相比， 本发明有益的技术效果在于：  Compared with the prior art, the beneficial technical effects of the present invention are:
1、当焊枪对连接缝熔融闭合完成后，通过使焊枪继续向前移动一段距离， 同时使 焊枪的火焰强度逐渐减弱的方法， 能有效减小激光熔融末端熔池的大小， 即凹坑的深 度得到有效控制。 通过实际操作表明， 当火焰强度采用逐渐减弱， 直至为零时， 能完 全消除在焊接轨迹终点位置因熔池形成的凹坑， 使焊接的密封性能得到大大提高。1. When the welding gun is melted and closed to the joint, the size of the molten pool at the end of the laser melting, that is, the depth of the pit, can be effectively reduced by moving the welding torch forward a distance and gradually reducing the flame intensity of the welding torch. Get effective control. Through actual operation, it is shown that when the flame intensity is gradually weakened, it will be completed until it is zero. The depression formed by the molten pool at the end position of the welding trajectory is completely eliminated, and the sealing performance of the welding is greatly improved.
2、当焊枪对连接缝熔融闭合完成后，通过使焊枪向偏离原焊接轨迹的方向继续移 动一段距离， 将焊接收尾处的轨迹偏移焊缝可以使末端熔池落在焊缝以外的区域， 避 免凹坑对电池密封性能产生的不良影响。 2. After the welding gun completes the melting and closing of the joint seam, by moving the welding gun to a distance away from the original welding trajectory, the trajectory offset welding seam at the welding receiving tail can make the end melting pool fall outside the weld seam. Avoid the adverse effects of pits on battery sealing performance.
3、采用上述激光焊接封口锂离子电池的方法，当激光束扫描一周回到扫描起始位 置后， 继续向前沿原焊接轨道扫描微量距离， 保征了锂离子电池的封口完全密封， 在 激光扫描焊接收尾处， 激光光斑强度逐渐减弱， 能有效减小激光熔融末端熔池大小， 即凹坑的深度得到有效控制。 进一步地， 将收尾处的激光光斑轨迹偏移焊缝可以使末 端熔池落在焊缝以外的电池壳或盖板区域， 消除了凹坑对电池产生的不良影响。 附图说明 "  3. Using the above method of laser welding to seal the lithium ion battery, after the laser beam scans back to the scanning start position one week, it continues to scan the trace distance along the original welding track, and the seal of the lithium ion battery is completely sealed, in the laser scanning At the end of the welding reception, the intensity of the laser spot is gradually weakened, which can effectively reduce the size of the molten pool at the end of the laser melting, that is, the depth of the pit is effectively controlled. Further, shifting the laser spot trajectory at the end of the offset weld can cause the end bath to fall in the battery case or cover area outside the weld, eliminating the adverse effects of the pit on the battery. BRIEF DESCRIPTION OF THE DRAWINGS
图 1是现有焊接结构示意图。  Figure 1 is a schematic view of a conventional welding structure.
图 2是本发明一种圆柱形锂离子电池的激光封口结构示意图。  2 is a schematic view showing the structure of a laser sealing structure of a cylindrical lithium ion battery of the present invention.
图 3是本发明另一种圆柱形锂离子电池激光封口结构示意图。  3 is a schematic view showing the structure of a laser sealing structure of another cylindrical lithium ion battery of the present invention.
图 4是本发明一种方形锂离子电池激光封口结构示意图。  4 is a schematic view showing a laser sealing structure of a prismatic lithium ion battery according to the present invention.
具体实施方式 detailed description
下面结合附图和具体实施例对本发明进行进一步详细描述： 实施例一、 一种圆柱形锂离子电池激光封口方法， 如图 2所示， 包括以下步骤：  The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Embodiment 1 A laser sealing method for a cylindrical lithium ion battery, as shown in FIG. 2, includes the following steps:
( 1 )将电池壳 4与盖板 1配合， 并装夹在激光焊接夹具上； (1) mating the battery case 4 with the cover 1 and clamping it on the laser welding jig;
(2)启动激光、 同时激光焊接夹具带动电池壳 4与盖板 1转动， 使激光光斑中心 相对电池壳 4与盖板 1的连接缝移动， 激光将连接逢熔融而使电池壳 4与盖板 1焊接 为一体； (2) starting the laser, and simultaneously the laser welding fixture drives the battery case 4 and the cover plate 1 to rotate, so that the center of the laser spot moves relative to the joint of the battery case 4 and the cover plate 1, and the laser will melt the connection to make the battery case 4 and the cover plate. 1 welding as one;
(3)电池壳 4与盖板 1在激光焊接夹具上旋转一周、激光焊接轨迹 2闭合后； 电 池壳 4、盖板 1继续转动，使新的焊接轨迹继续延伸 ½m，在新焊接轨迹延伸的同时激 光强度逐渐衰减至零， 同时保证新的焊接轨迹 3逐渐偏离原焊接轨迹 2， 使新的焊接 轨迹 3的收尾轨迹的终点落在电池壳 4上。 另外，根据需要， 也可不使新的焊接轨迹 3偏离原焊接轨迹 2， 使新的焊接轨迹 3 与原焊接轨迹 2重合， 只是要求更严格地使激光强度逐渐衰减至零， 以便在熔融后的 连接逢上消除凹坑。 实施例二、另一种圆柱形锂离子电池激光封口方法， 如图 3所示， 本实施例与实 施例一不同之处在于， 新的焊接轨迹 3的收尾轨迹的终点不是落在电池壳 4上， 而是 落在盖板 1上， 其它方面同实施例一。 实施例三、一种方形锂离子电池激光封口方法， 如图 4所示， 本实施例与实施例 二不同之处在于电池形状不同， 实施例二是圆柱形锂离子电池， 本实施例是方形锂离 子电池， 其它方面同实施例二。 必须指出， 以上只是通过实施例对本发明作出举例性说明，不能据此限定本发明 的保护范围。如： 本发明并不只限于对锂离子电池的封口，还可以是其它形式的电池， 以及其它需要进行对接密封的场合等。 进一步地， 根据不同的应用场合， 本发明并不 只限于激光焊接密封， 还可以采用其它焊接方式， 如气焊等， 这些仍将属于本发明的 保护范围之内。 (3) The battery case 4 and the cover plate 1 are rotated one time on the laser welding fixture, and the laser welding track 2 is closed; the battery case 4 and the cover plate 1 continue to rotate, so that the new welding track continues to extend 1⁄2 m, extending in the new welding track. At the same time, the laser intensity is gradually attenuated to zero, and at the same time, the new welding track 3 is gradually deviated from the original welding track 2, so that the new welding The end point of the ending track of the track 3 falls on the battery can 4. In addition, if necessary, the new welding trajectory 3 may not be deviated from the original welding trajectory 2, so that the new welding trajectory 3 coincides with the original welding trajectory 2, but only the laser intensity is gradually reduced to zero, so that after melting Connect the square to eliminate the pits. Embodiment 2 Another laser sealing method for a cylindrical lithium ion battery, as shown in FIG. 3, the difference between this embodiment and the first embodiment is that the end point of the ending track of the new welding track 3 does not fall on the battery case 4 Up, but falling on the cover 1, other aspects are the same as in the first embodiment. Embodiment 3 is a laser sealing method for a prismatic lithium ion battery. As shown in FIG. 4, the difference between the embodiment and the second embodiment is that the shape of the battery is different. The second embodiment is a cylindrical lithium ion battery, and the embodiment is a square. Lithium ion battery, other aspects are the same as the second embodiment. It should be noted that the above is merely illustrative of the invention by way of example, and the scope of the invention is not limited thereby. For example, the present invention is not limited to the sealing of a lithium ion battery, but also other types of batteries, and other occasions where a butt seal is required. Further, depending on the application, the present invention is not limited to laser welding seals, and other welding methods, such as gas welding, etc., may be employed, which are still within the scope of the present invention.

Claims

权利要求 、 一种焊接方法， 当焊枪对连接缝熔融闭合完成后，焊枪继续向前移动一段距离， 同时使焊枪的火焰强度逐渐减弱， 直至为零。 、 如权利要求 1所述的焊接方法， 其特征在于： 所述焊枪是激光焊枪， 当激光焊 枪对连接缝熔融闭合完成后， 激光焊枪继续向前移动一段距离， 同时使激光强 度逐渐减弱， 直至为零。 、 如权利要求 1或 2所述的焊接方法， 其特征在于： 当焊枪对连接缝熔融闭合完 成后， 焊枪向偏离原焊接轨迹的方向继续移动一段距离。 、 一种对电池封口的焊接方法，当焊枪对电池壳与盖板的连接缝熔融闭合完成后， 焊枪继续向前移动一段距离， 同时使焊枪的火焰强度逐渐减弱， 直至为零。 、 如权利要求 4所述对电池封口的焊接方法， 其特征在于： 当悍枪对连接缝熔融 闭合完成后， 焊枪向偏离原焊接轨迹的方向继续移动一段距离。 、 权利要求 5所述对电池封口的焊接方法， 其特征在于： 所述偏离原焊接轨迹的 方向是电池壳的方向。 、 如权利要求 5所述对电池封口的焊接方法， 其特征在于： 所述偏离原焊接轨迹 的方向是盖板的方向。 、 如权利要求 4-7任意一项所述对电池封口的焊接方法， 其特征在于： 所述焊枪 是激光焊枪， 当激光焊枪的激光光斑对连接缝熔融闭合完成后， 激光光斑继续 向前移动一段距离， 同时使激光强度逐渐减弱， 直至为零。 、 如权利要求 8所述的焊接方法， 其特征在于： 所述电池是锂离子电池。 0、 如权利要求 4-7任意一项所述的焊接方法， 其特征在于： 所述电池是锂离子电 池。 Claims, a welding method, after the welding gun is melted and closed to the joint seam, the welding gun continues to move forward a distance, and at the same time, the flame intensity of the welding gun is gradually weakened until it is zero. The welding method according to claim 1, wherein: the welding torch is a laser welding torch, and after the laser welding torch is melted and closed to the joint seam, the laser welding torch continues to move forward by a distance, and the laser intensity is gradually weakened until Zero. The welding method according to claim 1 or 2, wherein: after the welding gun is melt-closed to the joint seam, the welding gun continues to move a distance away from the original welding trajectory. A welding method for sealing a battery. After the welding gun is melted and closed to the joint of the battery case and the cover plate, the welding torch continues to move forward by a distance, and at the same time, the flame intensity of the welding torch is gradually weakened until it is zero. The method for welding a battery seal according to claim 4, wherein: after the smashing gun is melted and closed to the joint seam, the welding gun continues to move a distance away from the original welding trajectory. The method of soldering a battery seal according to claim 5, wherein the direction deviating from the original welding track is the direction of the battery case. A method of soldering a battery seal according to claim 5, wherein: the direction deviating from the original welding track is the direction of the cover. The method for welding a battery seal according to any one of claims 4-7, wherein: the welding torch is a laser welding torch, and the laser spot continues to move forward after the laser spot of the laser welding torch is melted and closed to the joint seam. At a distance, the laser intensity is gradually weakened until it is zero. The soldering method according to claim 8, wherein the battery is a lithium ion battery. The soldering method according to any one of claims 4 to 7, wherein the battery is a lithium ion battery.
PCT/CN2006/000062 2005-12-19 2006-01-16 A welding method and a method of sealing opening of battery by laser WO2007071121A1 (en)

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