WO2024021452A1 - 集流盘和圆柱电池 - Google Patents

集流盘和圆柱电池 Download PDF

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Publication number
WO2024021452A1
WO2024021452A1 PCT/CN2022/139868 CN2022139868W WO2024021452A1 WO 2024021452 A1 WO2024021452 A1 WO 2024021452A1 CN 2022139868 W CN2022139868 W CN 2022139868W WO 2024021452 A1 WO2024021452 A1 WO 2024021452A1
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WO
WIPO (PCT)
Prior art keywords
isolation
current collecting
collecting plate
ring
equal
Prior art date
Application number
PCT/CN2022/139868
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English (en)
French (fr)
Inventor
周德华
苗露
韩嘉豪
仲亮
Original Assignee
广州小鹏汽车科技有限公司
肇庆小鹏汽车有限公司
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Filing date
Publication date
Application filed by 广州小鹏汽车科技有限公司, 肇庆小鹏汽车有限公司 filed Critical 广州小鹏汽车科技有限公司
Publication of WO2024021452A1 publication Critical patent/WO2024021452A1/zh

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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
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • 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
    • H01M10/04—Construction or manufacture in general
    • H01M10/0422—Cells or battery with cylindrical 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
    • H01M50/583—Devices or arrangements for the interruption of current in response to current, e.g. fuses
    • 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 technical field of new energy vehicles, and in particular to a current collecting plate and a cylindrical battery.
  • cylindrical batteries Due to its strong pressure-bearing capacity and high production cycle, cylindrical batteries have incomparable advantages over soft-pack batteries and square-shell batteries, and are gradually being pursued and favored by the power market.
  • traditional cylindrical batteries are usually welded and fixed between the poles and the current collecting plate.
  • this connection method is difficult to effectively protect the circuit and can easily cause the cylindrical battery to overheat and burn.
  • the current collecting plate and the positive electrode post are connected by spot welding through an adapter piece.
  • this connection method takes up a relatively large space in the axial direction and reduces the axial energy density of the cylindrical battery.
  • the main purpose of this application is to propose a current collecting plate, which aims to meet the fast charging overcurrent requirements of cylindrical batteries and at the same time improve the axial energy density of cylindrical batteries.
  • the current collecting plate proposed in this application includes a collecting plate body, and the collecting plate body includes a collecting ring part and a connecting part provided on the inner periphery of the collecting ring part.
  • the collecting ring The connecting part is used for welding and fixing with the winding core, and the connecting part is used for welding and fixing with the pole.
  • a conductive connection structure and an isolation structure are provided between the connection part and the current collecting ring part.
  • the conductive connection structure is connected to the current collecting ring part.
  • the isolation structure is commonly arranged between the inner peripheral edge of the collector ring portion and the outer peripheral edge of the connecting portion.
  • the isolation structure includes a first isolation groove, a second isolation groove and an isolation ring portion.
  • the first isolation groove is ringed between the isolation ring portion and the connecting portion.
  • Two isolation groove rings are provided between the current collector ring part and the isolation ring part.
  • the conductive connection structure includes a first connection bridge and a second connection bridge. The first connection bridge connects the isolation ring part and the isolation ring part. The connecting part and the second connecting bridge connect the collecting ring part and the isolation ring part.
  • the first connecting bridge is connected to the inner peripheral edge of the isolation ring portion
  • the second connecting bridge is connected to the outer peripheral edge of the isolation ring portion
  • the first connecting bridge is connected to the outer peripheral edge of the isolation ring portion.
  • the second connecting bridge is misaligned.
  • the opposite ends of the first isolation groove are provided with rounded transitions; and/or the opposite ends of the second isolation groove are provided with rounded transitions.
  • the outer diameter of the connecting portion is greater than or equal to 3 mm and less than or equal to 8 mm; and/or the width of the isolation ring portion is greater than or equal to 1 mm and less than or equal to 5 mm.
  • the current collecting plate body is integrally formed with the current collecting ring part, the connecting part, the conductive connection structure and the isolation structure through a stamping process.
  • the shape of the connecting part is circular or rectangular; and/or the thickness of the connecting part is greater than or equal to 0.2 mm and less than or equal to 0.5 mm.
  • the surface of the collecting plate body is embossed.
  • This application also proposes a cylindrical battery, including pole tabs, poles and a current collecting plate as described above.
  • the pole tabs are welded and fixed to the current collecting ring portion of the current collecting plate, and the poles are welded and fixed.
  • the diameter of the cylindrical battery is greater than or equal to 40 mm and less than or equal to 60 mm.
  • the technical solution of this application is to provide a collecting ring part and a connecting part on the collecting plate body.
  • the connecting part is provided on the inner peripheral edge of the collecting ring part.
  • the collecting ring part is used for welding and fixing with the winding core
  • the connecting part is used for welding and fixing with the winding core.
  • the poles are welded and fixed, and a conductive connection structure and an isolation structure are provided between the connection part and the current collecting ring part.
  • the conductive connection structure and the isolation structure are jointly arranged between the inner peripheral edge of the current collecting ring part and the outer peripheral edge of the connecting part.
  • the connection part is generally welded to the pole through ultrasonic torque welding, and the collector ring part and the pole tab are connected together through laser welding.
  • the welding area of both is large, which can meet the fast charging and overcurrent requirements of cylindrical batteries. needs.
  • the connecting part and the current collecting part are partially connected through a conductive connection structure.
  • the conductive connection structure is first fused, causing the internal circuit of the cylindrical battery to play a role in the cylindrical battery. Over-temperature protection.
  • This connection method not only ensures the direct connection between the current collecting plate and the pole, but also saves the axial space of the cylindrical battery, thus improving the overall energy density of the cylindrical battery. This allows the current collecting plate to improve the axial energy density of the cylindrical battery while meeting the fast charging and overcurrent requirements of the cylindrical battery.
  • Figure 1 is a schematic structural diagram of an embodiment of the current collecting plate of the present application.
  • Figure 2 is a schematic structural diagram of another embodiment of the current collecting plate of the present application.
  • Figure 3 is a schematic structural diagram of the welding path between the current collecting plate and the tab in an embodiment of the cylindrical battery of the present application;
  • Figure 4 is a schematic structural diagram of the welding path between the current collecting plate and the tab in another embodiment of the cylindrical battery of the present application.
  • the connection between the pole and the current collecting plate is usually that the pole is directly welded to the axis of the current collecting plate.
  • the thickness of the current collecting plate is generally used. It is relatively thin.
  • the current collecting plate and the positive pole are spot welded together by setting up an adapter piece.
  • this connection method takes up a relatively large space in the axial direction and reduces the axial energy density of the cylindrical battery.
  • this application proposes a current collecting plate that can reduce the axial energy density of the cylindrical battery while meeting the fast charging overcurrent requirements of the cylindrical battery.
  • the collecting plate includes a collecting plate body 100
  • the collecting plate body 100 includes a collecting ring part 110 and a connecting part 120 provided on the inner periphery of the collecting ring part 110
  • the current collecting ring part 110 is used for welding and fixing with the winding core
  • the connecting part 120 is used for welding and fixing with the pole
  • a conductive connection structure 130 and an isolation structure 140 are provided between the connection part 120 and the current collecting ring part 110
  • the conductive connection structure 130 and the isolation structure 140 are commonly arranged between the inner circumferential edge of the collector ring portion 110 and the outer circumferential edge of the connecting portion 120 .
  • connection part 120 is provided on the inner periphery of the collector ring part 110 , and the two are partially connected through the conductive connection structure 130 , and the remaining part is isolated by the isolation structure 140 .
  • the connecting part 120 is generally welded to the pole through ultrasonic torque welding, and the collector ring part 110 and the pole tab are connected together through laser welding. The welding area of both is large and can meet the fast charging requirements of the cylindrical battery. flow needs.
  • connection part 120 and the current collecting ring part 110 are partially connected through a conductive connection structure 130. When the temperature of the current collection plate body 100 is too high or the internal winding core of the cylindrical battery is out of control, the conductive connection structure 130 is first fused, causing an internal circuit break in the cylindrical battery.
  • the isolation structure 140 has the function of thermal insulation, when the connecting part 120 and the pole are welded by ultrasonic torque, the torque force will not be transmitted to the winding core, so that the pole tab and the current collecting ring part 110 after the welding are completed Relative displacement occurs, or the winding core shifts to improve the stability of the winding core. And by isolating the connecting part 120 from the collecting ring part 110, the ultrasonic energy when the connecting part 120 and the pole are welded by ultrasonic torque is more concentrated, reducing the possibility of ultrasonic energy spreading outward, and more conducive to the concentration of ultrasonic waves.
  • the connecting portion 120 further improves the welding effect of the connecting portion 120 .
  • the technical solution of the present application is to provide a collecting ring part 110 and a connecting part 120 on the collecting plate body 100.
  • the connecting part 120 is provided on the inner periphery of the collecting ring part 110.
  • the collecting ring part 110 is used for welding and fixing with the winding core.
  • the connection part 120 is used for welding and fixing with the pole.
  • a conductive connection structure 130 and an isolation structure 140 are provided between the connection part 120 and the current collecting ring part 110.
  • the conductive connection structure 130 and the isolation structure 140 are jointly arranged around the current collecting ring part. 110 and the outer peripheral edge of the connecting portion 120 .
  • the connecting part 120 is generally welded to the pole through ultrasonic torque welding, and the collector ring part 110 and the pole tab are connected together through laser welding.
  • connection part 120 and the current collecting ring part 110 are partially connected through the conductive connection structure 130.
  • the conductive connection structure 130 is first fused, causing the internal circuit of the battery to be broken.
  • Cylindrical batteries provide over-temperature protection. This connection method not only ensures the direct connection between the current collecting plate and the pole, but also saves the axial space of the cylindrical battery, thus improving the overall energy density of the cylindrical battery. This allows the current collecting plate to improve the axial energy density of the cylindrical battery while meeting the fast charging and overcurrent requirements of the cylindrical battery.
  • the isolation structure 140 includes a first isolation groove 141, a second isolation groove 142 and an isolation ring part 143.
  • the first isolation groove 141 is ringed between the isolation ring part 143 and the connecting part 120.
  • Two isolation grooves 142 are arranged between the current collecting ring part 110 and the isolation ring part 143.
  • the conductive connection structure 130 includes a first connection bridge 131 and a second connection bridge 132.
  • the first connection bridge 131 connects the isolation ring part 143 and the connection part. 120.
  • the second connecting bridge 132 connects the collector ring part 110 and the isolation ring part 143.
  • the first isolation groove 141 is arranged between the isolation ring part 143 and the connection part 120, and the first connection bridge 131 connects the isolation ring part 143 and the connection part 120, that is, the first connection bridge 131 opens the first isolation groove 141. break, thereby partially connecting the inner peripheral edge of the isolation ring portion 143 with the outer peripheral edge of the connecting portion 120 , so that the connecting portion 120 and the isolation ring portion 143 are electrically connected.
  • the second isolation groove 142 is disposed between the current collecting ring part 110 and the isolation ring part 143 , and the second connecting bridge 132 connects the current collecting ring part 110 and the isolation ring part 143 , that is, the second connecting bridge 132 connects the second isolation groove 142 Break, thereby partially connecting the outer peripheral edge of the isolation ring portion 143 with the inner peripheral edge of the current collector ring portion 110 , so that the isolation ring portion 143 and the current collector ring portion 110 are electrically connected. Then, the connection part 120 and the current collecting ring part 110 are electrically connected.
  • the existence of the first isolation groove 141 , the second isolation groove 142 and the isolation ring part 143 not only isolates the ultrasonic energy from the connecting part 120 and the pole during ultrasonic torque welding, but also ensures that the connecting part 120 is not protected from the pole lug and the collecting ring part. 110Influence during welding.
  • the isolation ring portion 143 increases the current conduction area here and improves the overcurrent capability of the cylindrical battery.
  • first connecting bridge 131 can also be provided with multiple ones, so that multiple first connecting cavities divide the first isolation groove 141 into multiple sections;
  • second connecting bridge 132 can also be provided with multiple ones, so that multiple second connecting cavities can be provided.
  • the connecting cavity divides the first isolation groove 141 into multiple sections.
  • the outer diameter of the connecting portion 120 is greater than or equal to 3 mm and less than or equal to 8 mm. Specifically, if the outer diameter of the connecting part 120 is less than 3 mm, the outer diameter of the connecting part 120 is too small, making it difficult to weld the connecting part 120 and the pole, and is not conducive to the processing of the connecting part 120; if the outer diameter of the connecting part 120 is larger than 8mm, the outer diameter of the connecting part 120 is too small.
  • the diameter of the cylindrical battery is constant, increasing the outer diameter of the connecting part 120 will inevitably reduce the area of the collecting ring part 110. If the outer diameter of the connecting part 120 is too large, it may cause The welding area between the current ring portion 110 and the tab is too small, resulting in a decrease in the fast charge overcurrent capability of the cylindrical battery.
  • the outer diameter of the connecting part 120 may be 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, etc. Of course, in other embodiments, the outer diameter of the connecting part 120 may be less than 3 mm or greater than 8 mm.
  • the width of the isolation ring portion 143 is greater than or equal to 1 mm and less than or equal to 5 mm. Specifically, if the width of the isolation ring portion 143 is less than 1 mm, the width of the current collecting ring portion 110 is too small, which not only makes it difficult to ensure the welding effect, but also is not conducive to the processing of the current collecting plate; if the width of the isolation ring portion 143 is greater than 5 mm, then The width of the current collecting ring portion 110 is too large.
  • the width of the isolation ring portion 143 may be 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, etc. Of course, in other embodiments, the width of the isolation ring portion 143 may also be less than 1 mm or greater than 5 mm.
  • first connecting bridge 131 is connected to the inner peripheral edge of the isolation ring portion 143
  • second connecting bridge 132 is connected to the outer peripheral edge of the isolation ring portion 143
  • first connecting bridge 131 and the second connecting bridge 132 are disposed in a staggered position.
  • first connecting bridge 131 and the second connecting bridge 132 are disposed in a staggered position.
  • the first connecting bridge 131 and the second connecting bridge are enlarged.
  • the linear distance of 132 increases the proportion of current flowing along the circumferential direction of the isolation ring portion 143, thereby increasing the overcurrent of the isolation portion.
  • the connecting portion 120 is generally welded to the pole through ultrasonic torque welding, so The first connecting bridge 131 and the second connecting bridge 132 are disposed in a staggered position, and undergo the process of the isolation ring portion 143 transmitting torque force, so that the first connecting bridge 131 and the first connecting bridge 131 receive torque forces in different directions, thereby dispersing the torque force. This reduces the possibility of accidental breakage of the first connecting bridge 131 or the second connecting bridge 132 during the torque welding process.
  • the opposite ends of the first isolation groove 141 are provided with rounded corner transitions. That is, arc-shaped transitions are provided at both ends of the first isolation groove 141 to reduce the possibility of stress concentration and the possibility of cracking at both ends of the first isolation groove 141 due to torque force.
  • the opposite ends of the second isolation groove 142 are provided with rounded corner transitions. That is, arc-shaped transitions are provided at both ends of the second isolation groove 142 to reduce the possibility of stress concentration and the possibility of cracking at both ends of the second isolation groove 142 due to torque force.
  • the collecting plate body 100 is integrally formed on the collecting ring part 110, the connecting part 120, the conductive connection structure 130 and the isolation structure 140 through a stamping process.
  • a stamping process such as welding
  • the current collecting ring part 110, the connection part 120, the conductive connection structure 130 and the isolation structure 140 are formed separately and connected through processes such as welding, on the one hand, a new assembly process will be introduced and the production cycle time will be reduced.
  • the welding process is difficult because the connection size between the current collecting plates is relatively small during welding, and welding slag may be produced during use, which may affect the internal circuit of the cylindrical battery.
  • the shape of the connecting portion 120 is circular or rectangular.
  • the shape of the connecting portion 120 is not limited and can be adjusted according to actual needs.
  • the shape of the connecting portion 120 may also be a rhombus, a pentagon, etc., or an irregular shape.
  • the shape of the corresponding current collecting plate body 100 can also be adjusted according to the actual situation, and can be a circle or a regular polygon, etc.
  • the thickness of the connecting portion 120 is greater than or equal to 0.2 mm and less than or equal to 0.5 mm. Since the connection part 120 , the current collecting ring part 110 , the conductive connection structure 130 and the isolation structure 140 are integrally formed, that is, the thickness of the current collecting plate body 100 is greater than or equal to 0.2 mm and less than or equal to 0.5 mm.
  • the thickness of the current collecting plate body 100 is less than 0.2mm, the thickness of the current collecting plate body 100 is too small, and it is difficult to ensure that the current collecting plate body 100 can not only meet the requirements of fast charging overcurrent, but also have sufficient strength; if the current collecting plate body 100 is If the thickness of the current collecting plate body 100 is greater than 0.5mm, the thickness of the current collecting plate body 100 is too large. Since the current collecting plate body 100 is required to be as thin as possible during the welding process, if the thickness of the current collecting plate body 100 is too thick, it will be difficult to ensure the welding effect and reduce the Yield rate of cylindrical batteries.
  • the thickness of the connecting part 120 may be 0.2mm, 0.3mm, 0.4mm, 0.5mm, etc.
  • the thickness of the connecting portion 120 may also be less than 0.2 mm, or greater than 0.5 mm.
  • the surface of the collecting plate body 100 is embossed.
  • it enhances the structural strength of the current collecting plate body 100, which not only meets the demand for fast charging overcurrent, but also facilitates the welding of the current collecting plate body 100 and the tabs.
  • it provides positioning for the current collecting plate body 100 during welding, improving the The absorption efficiency of laser during laser welding reduces the difficulty of welding and improves the welding efficiency.
  • the cylindrical battery includes tabs, poles and a current collecting plate.
  • the specific structure of the current collecting plate refers to the above embodiments.
  • This cylindrical battery adopts all the technical solutions of all the above embodiments. , so it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described again one by one.
  • the pole tab is welded and fixed to the current collecting ring portion 110 of the current collecting plate, the pole is welded and fixed to the connecting portion 120 of the current collecting plate, and there are various welding tracks between the current collecting ring portion 110 and the pole tab.
  • the welding track between the collector ring portion 110 and the pole tab may extend along the circumferential direction of the collector ring portion 110 , or extend along the radial direction of the collector ring portion 110 , or in the collector ring portion 110 .
  • the portion 110 has a spiral shape or other irregular tracks.
  • the welding track between the current collecting ring portion 110 and the tab is in the form of a point. In other embodiments, the welding track can also be a linear track.
  • the diameter of the cylindrical battery is greater than or equal to 40mm and less than or equal to 60mm.
  • the diameter of the cylindrical battery is usually greater than or equal to 40mm and less than or equal to 60mm.
  • the length of the corresponding cylindrical battery is usually greater than or equal to 85mm and less than or equal to 130mm.
  • the diameter of the cylindrical battery can be 40mm, 46mm, 50mm, 55mm, 60mm, etc.
  • the length of the corresponding cylindrical battery can be 85mm, 90mm, 100mm, 110mm, 115mm, 120mm, 130mm, etc.
  • the diameter of the cylindrical battery may also be less than 40 mm, or greater than 60 mm.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

本申请公开一种集流盘和圆柱电池，其中，该集流盘包括集流盘本体，所述集流盘本体包括集流环部、及设于所述集流环部内周缘的连接部，所述集流环部用于与卷芯焊接固定，所述连接部用于与极柱焊接固定，所述连接部与所述集流环部之间设置有导电连接结构和隔离结构，所述导电连接结构与所述隔离结构共同环设于所述集流环部内周缘与所述连接部的外周缘之间。

Description

集流盘和圆柱电池
本申请要求于2022年7月28日申请的、申请号为202210901374.5的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及新能源汽车技术领域，特别涉及一种集流盘和圆柱电池。
 背景技术
圆柱电池因其承压能力强、生产节拍高的优点，相对软包电池与方壳电池有着不可比拟的优势，逐渐获得动力市场的追逐和青睐。为满足电池快充过流的需求，传统的圆柱电池通常采用极柱与集流盘之间焊接固定，但此种连接方式难以有效保护电路，易导致圆柱电池过热烧毁。为解决这一问题，采用通过转接片将集流盘与正极极柱点焊在一起的方式连接，但此种连接方式轴向占用空间比较大，降低了圆柱电池的轴向能量密度。
 技术问题
本申请的主要目的是提出集流盘，旨在满足圆柱电池的快充过流需求的同时，提高圆柱电池的轴向能量密度。
 技术解决方案
为实现上述目的，本申请提出的集流盘，包括集流盘本体，所述集流盘本体包括集流环部、及设于所述集流环部内周缘的连接部，所述集流环部用于与卷芯焊接固定，所述连接部用于与极柱焊接固定，所述连接部与所述集流环部之间设置有导电连接结构和隔离结构，所述导电连接结构与所述隔离结构共同环设于所述集流环部内周缘与所述连接部的外周缘之间。
在一实施例中，所述隔离结构包括第一隔离槽、第二隔离槽及隔离环部，所述第一隔离槽环设于所述隔离环部与所述连接部之间，所述第二隔离槽环设于所述集流环部与所述隔离环部之间，所述导电连接结构包括第一连接桥与第二连接桥，所述第一连接桥连接所述隔离环部与所述连接部，所述第二连接桥连接所述集流环部与所述隔离环部。
在一实施例中，所述第一连接桥连接于所述隔离环部的内周缘，所述第二连接桥连接于所述隔离环部的外周缘，且所述第一连接桥与所述第二连接桥错位设置。
在一实施例中，所述第一隔离槽的相对两端均设有圆角过渡；和/或，所述第二隔离槽的相对两端均设有圆角过渡。
在一实施例中，所述连接部的外径大于或等于3mm，且小于或等于8mm；和/或，所述隔离环部的宽度大于或等于1mm，小于或等于5mm。
在一实施例中，所述集流盘本体经由冲压工艺一体成型于所述集流环部、所述连接部、所述导电连接结构以及所述隔离结构。
在一实施例中，所述连接部的形状为圆形或长方形；和/或，所述连接部的厚度大于或等于0.2mm，且小于或等于0.5mm。
所述集流盘本体的表面进行压花处理。
本申请还提出一种圆柱电池，包括极耳、极柱以及如上所述的集流盘，所述极耳焊接固定于所述集流盘的所述集流环部，所述极柱焊接固定于所述集流盘的所述连接部，且所述集流环部上与所述极耳之间的焊接轨迹具有多种。
在一实施例中，所述圆柱电池的直径大于或等于40mm，小于或等于60mm。
 有益效果
本申请技术方案通过在集流盘本体上设置集流环部和连接部，连接部设于集流环部的内周缘，该集流环部用于与卷芯焊接固定，连接部用于与极柱焊接固定，连接部与集流环部之间设置有导电连接结构和隔离结构，导电连接结构与隔离结构共同环设于集流环部内周缘与连接部的外周缘之间。连接部一般通过超声扭矩焊接的方式与极柱焊接在一起，集流环部与极耳通过激光焊接的方式连接在一起，二者的焊接面积均较大，能够满足圆柱电池的快充过流的需求。且连接部与集流部局部通过导电连接结构连接，当集流盘温度过高或者圆柱电池内部卷芯失控时，该导电连接结构首先被熔断，使得圆柱电池内部断路，以对圆柱电池起到过温保护作用。此种连接方式，既保证了集流盘与极柱的直接连接，又节约了圆柱电池的轴向空间，进而提高圆柱电池的整体能量密度。使得该集流盘在满足圆柱电池的快充过流需求的同时，提高圆柱电池的轴向能量密度。
 附图说明
为了更清楚地说明本申请实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中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，还可以根据这些附图示出的结构获得其他的附图。
图1为本申请集流盘一实施例的结构示意图；
图2为本申请集流盘另一实施例的结构示意图；
图3为本申请圆柱电池一实施例中的集流盘与极耳的焊接路径的结构示意图；
图4为本申请圆柱电池另一实施例中的集流盘与极耳的焊接路径的结构示意图。
附图标号说明：
标号 名称 标号 名称
100 集流盘本体 132 第二连接桥
110 集流环部 140 隔离结构
120 连接部 141 第一隔离槽
130 导电连接结构 142 第二隔离槽
131 第一连接桥 143 隔离环部
本申请目的的实现、功能特点及优点将结合实施例，参照附图做进一步说明。
 本发明的实施方式
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本申请的一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
需要说明，若本申请实施例中有涉及方向性指示（诸如上、下、左、右、前、后……），则该方向性指示仅用于解释在某一特定姿态（如附图所示）下各部件之间的相对位置关系、运动情况等，如果该特定姿态发生改变时，则该方向性指示也相应地随之改变。
另外，若本申请实施例中有涉及“第一”、“第二”等的描述，则该“第一”、“第二”等的描述仅用于描述目的，而不能理解为指示或暗示其相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括至少一个该特征。另外，全文中出现的“和/或”的含义为，包括三个并列的方案，以“A和/或B为例”，包括A方案，或B方案，或A和B同时满足的方案。另外，各个实施例之间的技术方案可以相互结合，但是必须是以本领域普通技术人员能够实现为基础，当技术方案的结合出现相互矛盾或无法实现时应当认为这种技术方案的结合不存在，也不在本申请要求的保护范围之内。
现有技术中，极柱与集流盘之间的连接通常为极柱直接焊接在集流盘的轴心，但为保证焊接的稳定性，提高良品率，一般采用的集流盘的厚度都比较薄，当圆柱电池需要进行快充过流时，电流较大，导致集流盘产生较大热量，难以有效保护电路，易导致圆柱电池过热烧毁。为保护电路，通过设置转接片将集流盘与正极极柱点焊在一起的，但此种连接方式轴向占用空间比较大，降低了圆柱电池的轴向能量密度。
有鉴于此，本申请提出一种集流盘，在满足圆柱电池的快充过流需求的同时，降低圆柱电池的轴向能量密度。
在本申请实施例中，如图1所示，该集流盘包括集流盘本体100，集流盘本体100包括集流环部110、及设于集流环部110内周缘的连接部120，集流环部110用于与卷芯焊接固定，连接部120用于与极柱焊接固定，连接部120与集流环部110之间设置有导电连接结构130和隔离结构140，导电连接结构130与隔离结构140共同环设于集流环部110内周缘与连接部120的外周缘之间。
连接部120设于集流环部110的内周缘，且二者局部通过导电连接结构130连接，其余部分由隔离结构140隔离。连接部120一般通过超声扭矩焊接的方式与极柱焊接在一起，集流环部110与极耳通过激光焊接的方式连接在一起，二者的焊接面积均较大能够满足圆柱电池的快充过流的需求。且连接部120与集流环部110局部通过导电连接结构130连接，当集流盘本体100温度过高或者圆柱电池内部卷芯失控时，该导电连接结构130首先被熔断，使得圆柱电池内部断路，以对圆柱电池起到过温保护作用。因该隔离结构140具有隔热隔力的作用，使得连接部120与极柱通过超声扭矩焊接时，使得扭矩力不会传递到卷芯上，使得焊接完成后的极耳与集流环部110发生相对移位，或者卷芯移位，提高卷芯的稳定性。且通过将连接部120与集流环部110隔离开来，使得连接部120与极柱通过超声扭矩焊接时的超声波能量更为集中，减少超声波能量向外扩散的可能，更有利于超声波集中在连接部120，进而提升连接部120的焊接效果。
本申请技术方案通过在集流盘本体100上设置集流环部110和连接部120，连接部120设于集流环部110的内周缘，该集流环部110用于与卷芯焊接固定，连接部120用于与极柱焊接固定，连接部120与集流环部110之间设置有导电连接结构130和隔离结构140，导电连接结构130与隔离结构140共同环设于集流环部110内周缘与连接部120的外周缘之间。连接部120一般通过超声扭矩焊接的方式与极柱焊接在一起，集流环部110与极耳通过激光焊接的方式连接在一起，二者的焊接面积均较大，能够满足圆柱电池的快充过流的需求。且连接部120与集流环部110局部通过导电连接结构130连接，当集流盘温度过高或者圆柱电池内部卷芯失控时，该导电连接结构130首先被熔断，使得电池内部断路，以对圆柱电池起到过温保护作用。此种连接方式，既保证了集流盘与极柱的直接连接，又节约了圆柱电池的轴向空间，进而提高圆柱电池的整体能量密度。使得该集流盘在满足圆柱电池的快充过流需求的同时，提高圆柱电池的轴向能量密度。
进一步的，在一实施例中，隔离结构140包括第一隔离槽141、第二隔离槽142及隔离环部143，第一隔离槽141环设于隔离环部143与连接部120之间，第二隔离槽142环设于集流环部110与隔离环部143之间，导电连接结构130包括第一连接桥131与第二连接桥132，第一连接桥131连接隔离环部143与连接部120，第二连接桥132连接集流环部110与隔离环部143。具体地，第一隔离槽141环设于隔离环部143与连接部120之间，第一连接桥131连接隔离环部143与连接部120，即第一连接桥131将第一隔离槽141打断，从而将隔离环部143的内周缘与连接部120的外周缘局部连接起来，使得连接部120与隔离环部143电连接。第二隔离槽142环设于集流环部110与隔离环部143之间，第二连接桥132连接集流环部110与隔离环部143，即第二连接桥132将第二隔离槽142打断，从而将隔离环部143的外周缘与集流环部110的内周缘局部连接起来，使得隔离环部143与集流环部110电连接。进而使得连接部120与集流环部110电连接。该第一隔离槽141、第二隔离槽142及隔离环部143的存在，不仅隔离连接部120与极柱超声扭矩焊接时的超声波能量，而且保证连接部120不受极耳与集流环部110焊接时的影响。隔离环部143增加了电流在此处的传导面积，提升圆柱电池的过流能力。
其中，该第一连接桥131也可以设有多个，使得多个第一连接腔将第一隔离槽141分隔成多段；该第二连接桥132也可以设有多个，使得多个第二连接腔将第一隔离槽141分隔成多段。
在一实施例中，连接部120的外径大于或等于3mm，且小于或等于8mm。具体地，若连接部120的外径小于3mm，连接部120外径过小，使得连接部120与极柱不好焊接加工，也不利于连接部120的加工；若连接部120的外径大于8mm，连接部120外径过小，在圆柱电池直径一定的情况下，增大连接部120的外径势必要减少集流环部110的面积，连接部120的外径过大，可能导致集流环部110与极耳的焊接面积过小，导致圆柱电池的快充过电流能力下降。
其中，连接部120的外径具体可以为3mm、4mm、5mm、6mm、7mm、8mm等，当然，在其它实施例中，连接部120的外径也可以小于3mm，或者大于8mm。
在另一实施例中，隔离环部143的宽度大于或等于1mm，小于或等于5mm。具体地，若隔离环部143的宽度小于1mm，则集流环部110的宽度过小，不仅焊接效果难以保证，而且不利于集流盘的加工；若隔离环部143的宽度大于5mm，则集流环部110的宽度过大，在圆柱电池直径一定的情况下，增大集流环部110的宽度势必要减少集流环部110和/或连接的面积，可能导致集流环部110与极耳的焊接面积，和/或极耳与连接部120的焊接面积过小，导致圆柱电池的快充过电流能力下降。
其中，隔离环部143的宽度具体可以为1mm、2mm、3mm、4mm、5mm等，当然，在其它实施例中，隔离环部143的宽度也可以小于1mm，或大于5mm。
更进一步的，第一连接桥131连接于隔离环部143的内周缘，第二连接桥132连接于隔离环部143的外周缘，且第一连接桥131与第二连接桥132错位设置。具体地，且第一连接桥131与第二连接桥132错位设置，相较于采用第一连接桥131与第二连接桥132相对设置，一方面增大第一连接桥131与第二连接桥132的直线距离，增大电流沿隔离环部143的周向流过的比例，从而增大隔离部的过流，另一方面因连接部120一般通过超声扭矩焊接的方式与极柱焊接在一起，因第一连接桥131与第二连接桥132错位设置，经历了隔离环部143传递扭矩力的过程，使得第一连接桥131与第一连接桥131受到不同方向的扭矩力，从而分散扭矩力，减少第一连接桥131或第二连接桥132在扭矩焊接的过程中发生意外折断的可能。
为进一步降低第一连接桥131在扭矩焊接的过程中发生意外折断的可能。在一实施例中，第一隔离槽141的相对两端均设有圆角过渡。即在第一隔离槽141的两端均设置弧形过渡，降低应力集中的可能，减少第一隔离槽141的两端因扭矩力而发生开裂的可能。
为进一步降低第二连接桥132在扭矩焊接的过程中发生意外折断的可能。在一实施例中，第二隔离槽142的相对两端均设有圆角过渡。即在第二隔离槽142的两端均设置弧形过渡，降低应力集中的可能，减少第二隔离槽142的两端因扭矩力而发生开裂的可能。
为方便集流盘的加工，在一实施例中，集流盘本体100经由冲压工艺一体成型于集流环部110、连接部120、导电连接结构130以及隔离结构140。具体地，若集流环部110、连接部120、导电连接结构130以及隔离结构140分体成型，并经由焊接等工序进行连接，一方面会引入新的装配工序，降低生产节拍。另一方面，焊接时因集流盘之间的连接尺寸较好，具有较大的焊接加工难度，且使用过程会可能会产生焊渣，影响圆柱电池内部电路。
结合参照图1和图2，在一实施例中，连接部120的形状为圆形或长方形。连接部120的形状不受限制，可根据实际需求进行调整。在其它实施例中，连接部120的形状也可以为菱形、五角形等，或者不规则形状。对应集流盘本体100的形状也可以根据实际情况调整，可以为圆形或正多边形等。
为保证集流盘本体100既能满足快充过电流的需求，又具有足够的强度。在一实施例中，连接部120的厚度大于或等于0.2mm，且小于或等于0.5mm。因连接部120、集流环部110、导电连接结构130以及隔离结构140一体成型，即集流盘本体100的厚度大于或等于0.2mm，且小于或等于0.5mm。若集流盘本体100的厚度小于0.2mm，则集流盘本体100厚度过小，难以保证集流盘本体100既能满足快充过电流的需求，又具有足够的强度；若集流盘本体100的厚度大于0.5mm，则集流盘本体100厚度过大，因焊接过程中要求集流盘本体100应尽可能的薄，若集流盘本体100的厚度过厚，难以保证焊接效果，降低圆柱电池的良品率。
具体地，连接部120的厚度可以为0.2mm、0.3mm、0.4mm、0.5mm等。当然，在其它实施例中，连接部120的厚度也可以小于0.2mm，或大于0.5mm。
为进一步增强集流盘本体100的强度，在一实施例中，集流盘本体100的表面进行压花处理。一方面增强集流盘本体100的结构强度，在满足快充过电流的需求的同时，方便集流盘本体100与极耳的焊接，另一方面，为集流盘本体100焊接时定位，提高激光焊接时对激光的吸收效率，降低焊接难度，提高焊接效率。
本申请还提出一种圆柱电池，该圆柱电池包括包括极耳、极柱和集流盘，该集流盘的具体结构参照上述实施例，由于本圆柱电池采用了上述所有实施例的全部技术方案，因此至少具有上述实施例的技术方案所带来的所有有益效果，在此不再一一赘述。其中，极耳焊接固定于集流盘的集流环部110，极柱焊接固定于集流盘的连接部120，且集流环部110上与极耳之间的焊接轨迹具有多种。结合参照图3和图4，集流环部110与极耳之间的焊接轨迹可沿集流环部110的周向延伸，或者沿集流环部110的径向延伸，或者在集流环部110上呈螺旋状，或者其它无规律轨迹。本实施例中集流环部110与极耳之间的焊接轨迹为点状，在其它实施例中，也可以为线状轨迹。
进一步的，圆柱电池的直径大于或等于40mm，且小于或等于60mm。具体地，因锂电池特性，当锂电池的尺寸小于40mm，或大于60mm时，锂电池的尺寸过大或过小时，难以体现圆柱电池200的优势，或者设计上差异较大，固定圆柱电池的直径通常大于或等于40mm，且小于或等于60mm。圆柱电池的直径大于或等于40mm，且小于或等于60mm时，对应圆柱电池的长度通常大于或等于85mm，且小于或等于130mm。
具体地，圆柱电池的直径可以为40mm、46mm、50mm、55mm、60mm等。对应圆柱电池的长度可以为85mm、90mm、100mm、110mm、115mm、120mm、130mm等。当然，其它实施例中，圆柱电池的直径也可以小于40mm，或大于60mm。
以上所述仅为本申请的一些实施例，并非因此限制本申请的专利范围，凡是在本申请的发明构思下，利用本申请说明书及附图内容所作的等效结构变换，或直接/间接运用在其他相关的技术领域均包括在本申请的专利保护范围内。

Claims (10)

  1. 一种集流盘，其中，包括集流盘本体(100)，所述集流盘本体(100)包括集流环部(110)、及设于所述集流环部(110)内周缘的连接部(120)，所述集流环部(110)用于与卷芯焊接固定，所述连接部(120)用于与极柱焊接固定，所述连接部(120)与所述集流环部(110)之间设置有导电连接结构(130)和隔离结构(140)，所述导电连接结构(130)与所述隔离结构(140)共同环设于所述集流环部(110)内周缘与所述连接部(120)的外周缘之间。
  2. 如权利要求1所述的集流盘，其中，所述隔离结构(140)包括第一隔离槽(141)、第二隔离槽(142)及隔离环部(143)，所述第一隔离槽(141)环设于所述隔离环部(143)与所述连接部(120)之间，所述第二隔离槽(142)环设于所述集流环部(110)与所述隔离环部(143)之间，所述导电连接结构(130)包括第一连接桥(131)与第二连接桥(132)，所述第一连接桥(131)连接所述隔离环部(143)与所述连接部(120)，所述第二连接桥(132)连接所述集流环部(110)与所述隔离环部(143)。
  3. 如权利要求2所述的集流盘，其中，所述第一连接桥(131)连接于所述隔离环部(143)的内周缘，所述第二连接桥(132)连接于所述隔离环部(143)的外周缘，且所述第一连接桥(131)与所述第二连接桥(132)错位设置。
  4. 如权利要求2所述的集流盘，其中，所述第一隔离槽(141)的相对两端均设有圆角过渡；和/或，所述第二隔离槽(142)的相对两端均设有圆角过渡。
  5. 如权利要求2所述的集流盘，其中，所述连接部(120)的外径大于或等于3mm，且小于或等于8mm；和/或，所述隔离环部(143)的宽度大于或等于1mm，小于或等于5mm。
  6. 如权利要求1所述的集流盘，其中，所述集流盘本体(100)经由冲压工艺一体成型于所述集流环部(110)、所述连接部(120)、所述导电连接结构(130)以及所述隔离结构(140)。
  7. 如权利要求1所述的集流盘，其中，所述连接部(120)的形状为圆形或长方形；和/或，所述连接部(120)的厚度大于或等于0.2mm，且小于或等于0.5mm。
  8. 如权利要求1至7中任意一项所述的集流盘，其中，所述集流盘本体(100)的表面进行压花处理。
  9. 一种圆柱电池，其中，包括极耳、极柱以及如权利要求1至8中任意一项所述的集流盘，所述极耳焊接固定于所述集流盘的所述集流环部(110)，所述极柱焊接固定于所述集流盘的所述连接部(120)，且所述集流环部(110)上与所述极耳之间的焊接轨迹具有多种。
  10. 如权利要求9所述的圆柱电池，其中，所述圆柱电池的直径大于或等于40mm，小于或等于60mm。
PCT/CN2022/139868 2022-07-28 2022-12-19 集流盘和圆柱电池 WO2024021452A1 (zh)

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CN115188968B (zh) * 2022-07-28 2024-05-17 肇庆小鹏汽车有限公司 集流盘和圆柱电池
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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009252350A (ja) * 2008-04-01 2009-10-29 Panasonic Corp 円筒形電池およびその製造方法
JP2010198956A (ja) * 2009-02-26 2010-09-09 Sanyo Electric Co Ltd 密閉型蓄電池
CN206098541U (zh) * 2016-09-27 2017-04-12 江门市蓬江区东泰达电子有限公司 一种干电池
CN109478694A (zh) * 2016-08-01 2019-03-15 三星Sdi株式会社 可再充电电池
CN216488160U (zh) * 2021-12-23 2022-05-10 厦门海辰新能源科技有限公司 用于电池的集流盘以及电池
CN115188968A (zh) * 2022-07-28 2022-10-14 肇庆小鹏汽车有限公司 集流盘和圆柱电池
CN115911768A (zh) * 2022-11-16 2023-04-04 厦门海辰储能科技股份有限公司 集流件、端盖组件、电池单体、电池包及用电设备

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5555676B2 (ja) * 2011-09-02 2014-07-23 日立ビークルエナジー株式会社 円筒形二次電池
CN210489713U (zh) * 2019-01-15 2020-05-08 苏州市美格尔精密机械科技有限公司 带过流保护的电池模组
CN216120647U (zh) * 2021-10-20 2022-03-22 宁德时代新能源科技股份有限公司 电池单体、电池及用电装置
CN114678662A (zh) * 2022-03-02 2022-06-28 深圳市比克动力电池有限公司 一种电池

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009252350A (ja) * 2008-04-01 2009-10-29 Panasonic Corp 円筒形電池およびその製造方法
JP2010198956A (ja) * 2009-02-26 2010-09-09 Sanyo Electric Co Ltd 密閉型蓄電池
CN109478694A (zh) * 2016-08-01 2019-03-15 三星Sdi株式会社 可再充电电池
CN206098541U (zh) * 2016-09-27 2017-04-12 江门市蓬江区东泰达电子有限公司 一种干电池
CN216488160U (zh) * 2021-12-23 2022-05-10 厦门海辰新能源科技有限公司 用于电池的集流盘以及电池
CN115188968A (zh) * 2022-07-28 2022-10-14 肇庆小鹏汽车有限公司 集流盘和圆柱电池
CN115911768A (zh) * 2022-11-16 2023-04-04 厦门海辰储能科技股份有限公司 集流件、端盖组件、电池单体、电池包及用电设备

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