WO2021120807A1 - 软包电池模组及软包电池模组极耳的激光焊接方法 - Google Patents

软包电池模组及软包电池模组极耳的激光焊接方法 Download PDF

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Publication number
WO2021120807A1
WO2021120807A1 PCT/CN2020/120998 CN2020120998W WO2021120807A1 WO 2021120807 A1 WO2021120807 A1 WO 2021120807A1 CN 2020120998 W CN2020120998 W CN 2020120998W WO 2021120807 A1 WO2021120807 A1 WO 2021120807A1
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Prior art keywords
tab
battery module
soft
welding
tabs
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PCT/CN2020/120998
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English (en)
French (fr)
Inventor
石斌
缪书坤
王富存
楼志强
杨宝峰
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双登集团股份有限公司
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Publication of WO2021120807A1 publication Critical patent/WO2021120807A1/zh

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/70—Auxiliary operations or equipment
    • B23K26/702—Auxiliary equipment
    • 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
    • B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
    • B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
    • B23K37/0426—Fixtures for other work
    • B23K37/0435—Clamps
    • B23K37/0443—Jigs
    • 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
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • 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
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/574—Devices or arrangements for the interruption of current
    • H01M50/579—Devices or arrangements for the interruption of current in response to shock
    • 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
    • B23K2101/00—Articles made by soldering, welding or cutting
    • B23K2101/36—Electric or electronic devices
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
    • 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 the technical field of soft-packed batteries, in particular to a soft-packed battery module including a laser welding method for the tabs of the soft-packed battery module.
  • the driving range has become an important indicator to measure the performance of electric vehicles.
  • the large-capacity lithium-ion battery system has become the key to improving this indicator.
  • Multiple battery cells are connected in parallel and in series to meet the requirements. Lithium-ion battery system for vehicle operating voltage and driving range requirements.
  • connection between the battery core and the battery core generally adopts the method of connecting row welding.
  • the soft-clad battery core module generally adopts laser welding.
  • Laser welding belongs to fusion welding, which uses laser beam as energy source to impinge on the weldment joints.
  • the laser beam can be guided by a flat optical element (such as a mirror), and then a reflective focusing element or lens is used to project the beam on the weld.
  • Laser welding is a non-contact welding. No pressure is required during the operation, but inert gas is required to prevent oxidation of the molten pool.
  • the laser welding method in the prior art has high requirements for the cutting accuracy of the tabs, low welding stability, low group efficiency, low welding strength, low comprehensive cost performance, and the stress caused by the lateral vibration on the tabs during welding and actual use. Larger, the tabs are easily damaged, and the potential safety hazard is high.
  • the purpose of the present invention is to overcome the defects of the prior art and provide a method for laser welding of the soft-packed battery module and the tabs of the soft-packed battery module.
  • the technical solution for achieving the objective of the present invention is: a soft-packed battery module having a battery module, the battery module having at least two battery units, at least one tab fixing bracket, at least one metal connecting row and tabs, The tab passes through the tab fixing bracket and is welded to the metal connecting row, and the tab fixing bracket has
  • a support portion the support portion is used to fixedly support the tabs
  • a bending part is used to bend the tab at the top of the tab fixing bracket
  • the metal connecting row is fixedly connected to the tab fixing bracket, the metal connecting row has a welding part, and the welding part is attached to the bending part.
  • the supporting portion is L-shaped.
  • the support portion has a horizontal end, and the width of the horizontal end is the same as the distance between two adjacent tabs.
  • the supporting portion has a longitudinal end, one side of the longitudinal end is vertical and connected to the bending portion, and the other side of the longitudinal end is inclined and the included angle with the horizontal end is an obtuse angle.
  • the obtuse angle in the above technical solution is 150°-175°.
  • the metal connecting row is connected to the lug fixing bracket with screws or snaps.
  • the battery modules in the above technical solutions have a parallel connection form.
  • At least two of the battery modules are connected in parallel and then connected in series.
  • the invention also provides a laser welding method for the tabs of the soft pack battery module, which is characterized in that it has the following steps:
  • Step one forming a welding part, extending the tab from the tab fixing bracket and bending at the bending part, and pressing the welding part of the metal connecting row close to the bending part to form a welding part;
  • Step two fixing the welding part, and fixing the metal connecting row to the lug fixing bracket;
  • Step three weld the part by continuous laser welding.
  • the present invention has the following positive effects:
  • the invention provides a soft-pack battery module and a laser welding method for the soft-pack battery module lugs.
  • a lug fixing bracket with a wedge-shaped structure is used to make the top of the lug bend in a certain arc, thereby increasing the welding area.
  • the direction of the main body of the tab is kept vertical, thereby reducing the stress caused by the lateral vibration on the welding part of the tab.
  • This method reduces the precision requirements for cutting the tabs, can minimize the damage to the battery cells, and can simplify the manufacturing process of the battery modules and tabs laser welding method without damaging the battery cells, and improve production Efficiency and safety factor.
  • Fig. 1 is a schematic cross-sectional view of a battery module according to an exemplary embodiment of the present invention
  • Fig. 2 is an enlarged schematic diagram of part A in Fig. 1;
  • FIG. 3 is a schematic diagram of battery modules in parallel in an exemplary embodiment of the present invention.
  • FIG. 4 is a schematic diagram of battery modules connected in parallel and then connected in series according to an exemplary embodiment of the present invention.
  • battery module 100 battery module 1
  • battery unit 1 tab fixing bracket 2
  • metal connection row 3 tab 4
  • support part 21 bending part 22
  • tab hole 23 welding part 31, horizontal end 211, longitudinal end 212.
  • the present invention provides a soft pack battery module having a battery module 100
  • the battery module 100 has at least two battery units 1, at least one tab fixing bracket 2, At least one metal connecting row 3 and a tab 4, the tab 4 passing through the tab fixing bracket 2 and welded to the metal connecting row 3,
  • the tab fixing bracket 2 has a support 21, the support The portion 21 is used to fix and support the tab 4, the bending portion 22 is used to bend the tab 4 on the top of the tab fixing bracket 2, and the metal connecting row 3 Fixedly connected to the tab fixing bracket 2, the metal connecting row 3 has a welding part 31, and the welding part 31 is attached to the bending part 22.
  • the supporting portion 21 is L-shaped.
  • the supporting portion 21 has a horizontal end 211, and the width of the horizontal end 211 is the same as the distance between two adjacent tabs 4.
  • the supporting portion 21 has a longitudinal end 212, one side of the longitudinal end 212 is vertical and connected to the bending portion 22, and the other side of the longitudinal end 212 is inclined and the included angle with the horizontal end 211 is Obtuse angle.
  • the obtuse angle is 150° ⁇ 175°.
  • the vertical side of the longitudinal end 212 ensures that the main body direction of the tab 4 is vertical, and the inclined side of the longitudinal end 212 gives the support portion 21 sufficient support and structural stability.
  • the metal connecting row 3 is connected to the lug fixing bracket 2 by screws or snaps.
  • the battery module 100 has a parallel connection form. Adjacent tabs 4 with the same polarity pass through the tab hole 23 of the tab fixing bracket 2 and are close to the wedge-shaped tab fixing bracket 2, and the bent portion 22 on the top of the tab fixing bracket 2 forms an arc. Bend, and then use a long strip of metal connection row 3 to fully compress the top of the tab 4, and press the welding part 31 of the metal connection row 3 (that is, the metal connection row 3 presses the top bent part of the tab 4) Perform laser welding.
  • the laser welding method for the tabs of the soft pack battery module has the following steps:
  • Step one form a welding part, extend the tab 4 from the tab fixing bracket 2, and keep the main body of the tab 4 upright from the vertical side of the longitudinal end 212, and the upper end of the tab 4 is bent at the bending part 22,
  • the welded portion 31 of the metal connecting bar 3 is closely attached to the bent portion 22 to form a welded portion;
  • Step two fix the welding part, and fix the metal connection row 3 to the lug fixing bracket 2;
  • the fixed connection here can be, but not limited to, a snap connection or a screw connection, which is not limited here.
  • Step three weld the part by continuous laser welding.
  • the difference between the second embodiment and the first embodiment is that at least two of the battery modules 100 are connected in parallel and then connected in series.
  • the adjacent tabs 4 of the two parallel soft-pack battery modules with the same polarity pass through the tab hole 23 in the tab fixing bracket 2.
  • the vertical side of the longitudinal end 212 keeps the main body of the tab 4 upright.
  • the upper end of the lug 4 is bent at the bending portion 22, and the metal connection row 3 is used to press the lugs 4 of different polarities adjacent to each other in parallel to form a series connection.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Plasma & Fusion (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Battery Mounting, Suspending (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

本发明涉及一种软包电池模组，具有电池单元、极耳固定支架、金属连接排和极耳，极耳固定支架具有支撑部，支撑部用以固定支撑所述极耳，弯折部，弯折部用以将极耳在极耳固定支架的顶部弯折，金属连接排具有焊接部，焊接部与弯折部固定连接于极耳固定支架，金属连接排具有焊接部，焊接部与弯折部贴合。本发明通过一种楔形结构的极耳固定支架，使极耳顶部进行一定弧度的弯折，在增大焊接面积的同时，保持极耳主体方向竖直，从而减少横向振动对极耳焊接部分造成的应力。降低了对裁切极耳的精度要求，能够最小化地降低对电池单元的损害，使得能够在不损坏电池单元的情况下简化制造过程的电池模块和极耳激光焊接方法，提高生产效率和安全系数。

Description

软包电池模组及软包电池模组极耳的激光焊接方法 技术领域
本发明涉及软包电池技术领域，尤其涉及一种软包电池模组，包括该软包电池模组极耳的激光焊接方法。
背景技术
近年来，电动汽车用蓄电池技术快速发展，续驶里程成为衡量电动汽车性能的一项重要指标，大容量锂离子电池系统成为提升这一指标的关键，通过多个电芯并联和串联，形成满足整车工作电压和续驶里程要求的锂离子电池系统。
电芯与电芯之间的连接一般采用连接排焊接的方式，在模组制造过程中，一般软包电芯模组采用激光焊接。
激光焊接属于熔融焊接，以激光束为能源，冲击在焊件接头上。激光束可由平面光学原件(如镜子)导引，随后再以反射聚焦元件或镜片将光束投射在焊缝上。激光焊接属非接触式焊接，作业过程不需加压，但需使用惰性气体以防熔池氧化。
现有技术中激光焊接方法对极耳裁切精度要求高，焊接稳定性低，成组效率低，焊接强度不高，综合性价比低，在焊接和实际使用过程中横向振动对极耳造成的应力较大，极耳极易受损，安全隐患高。
因而，需要开发能够简化焊接方法和制造过程的电池模块和极耳焊接方法以提高生产效率和安全系数。
发明内容
本发明的目的是克服现有技术的缺陷，提供一种软包电池模组及软包电池模组极耳的激光焊接办法。
实现本发明目的的技术方案是：一种软包电池模组，具有电池模组， 所述电池模组具有至少两个电池单元、至少一个极耳固定支架、至少一个金属连接排和极耳，所述极耳穿过所述极耳固定支架并焊接于所述金属连接排，所述极耳固定支架具有
支撑部，所述支撑部用以固定支撑所述极耳，
弯折部，所述弯折部用以将所述极耳在所述极耳固定支架的顶部弯折，
所述金属连接排固定连接于所述极耳固定支架，所述金属连接排具有焊接部，所述焊接部与所述弯折部贴合。
上述技术方案所述支撑部为L形。
上述技术方案所述支撑部具有水平端，所述水平端的宽度与相邻两个极耳之间的距离相同。
上述技术方案所述支撑部具有纵向端，所述纵向端的一侧垂直且连接于所述弯折部，所述纵向端的另一侧倾斜且与所述水平端的夹角为钝角。
上述技术方案所述钝角为150°～175°。
上述技术方案所述金属连接排螺钉或卡扣连接于所述极耳固定支架。
上述技术方案所述电池模组具有并联形式。
上述技术方案至少两个所述电池模组具有先并联后串联形式。
本发明还提供一种软包电池模组极耳的激光焊接方法，其特征在于，具有以下步骤：
步骤一，形成焊接部分，将极耳从极耳固定支架伸出并在弯折部弯折，将金属连接排的焊接部紧贴弯折部形成焊接部分；
步骤二，固定焊接部分，将金属连接排固定连接于所述极耳固定支架；
步骤三，通过连续激光焊接焊接部分。
采用上述技术方案后，本发明具有以下积极的效果：
本发明提供一种软包电池模组及软包电池模组极耳的激光焊接方法，通过一种楔形结构的极耳固定支架，使极耳顶部进行一定弧度的弯折，在增大焊接面积的同时，保持极耳主体方向竖直，从而减少横向振动对极耳焊接部分造成的应力。此种方式降低了对裁切极耳的精度要求，能够最小化地降低对电池单元的损害，使得能够在不损坏电池单元的情况下简化制 造过程的电池模块和极耳激光焊接方法，提高生产效率和安全系数。
附图说明
为了使本发明的内容更容易被清楚地理解，下面根据具体实施例并结合附图，对本发明作进一步详细的说明，其中
图1为本发明的示例型实施例的电池模块的断面示意图；
图2为图1中A部的放大示意图；
图3为本发明的示例型实施例的并联形式的电池模块的示意图；
图4为本发明的示例型实施例的先并联后串联电池模块的示意图。
图中：电池模组100、电池单元1、极耳固定支架2、金属连接排3、极耳4、支撑部21、弯折部22、极耳孔23、焊接部31、水平端211、纵向端212。
具体实施方式
为使本发明实施例的目的、技术方案和优点更加清楚，下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本发明一部分实施例，而不是全部的实施例。通常在此处附图中描述和示出的本发明实施例的组件可以以各种不同的配置来布置和设计。
实施例一
见图1、图2和图3，本发明提供一种软包电池模组，具有电池模组100，其所述电池模组100具有至少两个电池单元1、至少一个极耳固定支架2、至少一个金属连接排3和极耳4，所述极耳4穿过所述极耳固定支架2并焊接于所述金属连接排3，所述极耳固定支架2具有支撑部21，所述支撑部21用以固定支撑所述极耳4，弯折部22，所述弯折部22用以将所述极耳4在所述极耳固定支架2的顶部弯折，所述金属连接排3固定连接于所述极耳固定支架2，所述金属连接排3具有焊接部31，所述焊接部31与所述弯折部22贴合。
所述支撑部21为L形。
所述支撑部21具有水平端211，所述水平端211的宽度与相邻两个极 耳4之间的距离相同。
所述支撑部21具有纵向端212，所述纵向端212的一侧垂直且连接于所述弯折部22，所述纵向端212的另一侧倾斜且与所述水平端211的夹角为钝角。钝角为150°～175°。纵向端212垂直的一侧保证极耳4主体方向竖直，纵向端212倾斜的一侧给予支撑部21足够的支撑性和结构稳定性。
所述金属连接排3螺钉或卡扣连接于所述极耳固定支架2。
所述电池模组100具有并联形式。具有相同极性的相邻极耳4从极耳固定支架2的极耳孔23中穿出，并且紧贴楔形的极耳固定支架2，在极耳固定支架2顶部的弯折部22形成弧形弯折，然后用一长条状的金属连接排3将极耳4的顶部全部压紧，在金属连接排3的焊接部31(即金属连接排3压紧极耳4的顶部弯折部分)进行激光焊接。
软包电池模组极耳的激光焊接方法，具有以下步骤：
步骤一，形成焊接部分，将极耳4从极耳固定支架2伸出，由纵向端212的垂直一侧保持极耳4主体方向竖直，极耳4的上端在弯折部22弯折，将金属连接排3的焊接部31紧贴弯折部22形成焊接部分；
步骤二，固定焊接部分，将金属连接排3固定连接于所述极耳固定支架2；这里的固定连接可以采用但不仅限于卡扣连接或螺钉连接，在此不多做限定。
步骤三，通过连续激光焊接焊接部分。
实施例二
见图4，实施例二与实施例一的不同之处在于，至少两个所述电池模组100具有先并联后串联形式。两个并联的软包电池模块具有相同极性的相邻极耳4从极耳固定支架2中的极耳孔23穿出，由纵向端212的垂直一侧保持极耳4主体方向竖直，极耳4的上端在弯折部22弯折，使用金属连接排3将彼此相邻并联软包电池模块极性相异的极耳4压紧，形成串联。
以上所述的具体实施例，对本发明的目的、技术方案和有益效果进行了进一步详细说明，所应理解的是，以上所述仅为本发明的具体实施例而已，并不用于限制本发明，凡在本发明的精神和原则之内，所做的任何修 改、等同替换、改进等，均应包含在本发明的保护范围之内。

Claims (9)

  1. 一种软包电池模组，具有电池模组(100)，其特征在于：所述电池模组(100)具有至少两个电池单元(1)、至少一个极耳固定支架(2)、至少一个金属连接排(3)和极耳(4)，所述极耳(4)穿过所述极耳固定支架(2)并焊接于所述金属连接排(3)，所述极耳固定支架(2)具有
    支撑部(21)，所述支撑部(21)用以固定支撑所述极耳(4)，
    弯折部(22)，所述弯折部(22)用以将所述极耳(4)在所述极耳固定支架(2)的顶部弯折，
    所述金属连接排(3)固定连接于所述极耳固定支架(2)，所述金属连接排(3)具有焊接部(31)，所述焊接部(31)与所述弯折部(22)贴合。
  2. 根据权利要求1所述的一种软包电池模组，其特征在于：所述支撑部(21)为L形。
  3. 根据权利要求2所述的一种软包电池模组，其特征在于：所述支撑部(21)具有水平端(211)，所述水平端(211)的宽度与相邻两个极耳(4)之间的距离相同。
  4. 根据权利要求2所述的一种软包电池模组，其特征在于：所述支撑部(21)具有纵向端(212)，所述纵向端(212)的一侧垂直且连接于所述弯折部(22)，所述纵向端(212)的另一侧倾斜且与所述水平端(211)的夹角为钝角。
  5. 根据权利要求4所述的一种软包电池模组，其特征在于：所述钝角为150°～175°。
  6. 根据权利要求1所述的一种软包电池模组，其特征在于：所述金属连接排(3)螺钉或卡扣连接于所述极耳固定支架(2)。
  7. 根据权利要求1所述的一种软包电池模组，其特征在于：所述电池模组(100)具有并联形式。
  8. 根据权利要求1所述的一种软包电池模组，其特征在于：至少两个所述电池模组(100)具有先并联后串联形式。
  9. 一种软包电池模组极耳的激光焊接方法，其特征在于，具有以下步骤：
    步骤一，形成焊接部分，将极耳从极耳固定支架伸出并在弯折部弯折，将金属连接排的焊接部紧贴弯折部形成焊接部分；
    步骤二，固定焊接部分，将金属连接排固定连接于所述极耳固定支架；
    步骤三，通过连续激光焊接焊接部分。
PCT/CN2020/120998 2019-12-19 2020-10-14 软包电池模组及软包电池模组极耳的激光焊接方法 WO2021120807A1 (zh)

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