WO2022206894A1 - 一种圆柱电池 - Google Patents

一种圆柱电池 Download PDF

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Publication number
WO2022206894A1
WO2022206894A1 PCT/CN2022/084417 CN2022084417W WO2022206894A1 WO 2022206894 A1 WO2022206894 A1 WO 2022206894A1 CN 2022084417 W CN2022084417 W CN 2022084417W WO 2022206894 A1 WO2022206894 A1 WO 2022206894A1
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WO
WIPO (PCT)
Prior art keywords
semi
end plate
closed end
connecting piece
attached
Prior art date
Application number
PCT/CN2022/084417
Other languages
English (en)
French (fr)
Inventor
宁亚军
夏天军
于东朋
Original Assignee
蜂巢能源科技(无锡)有限公司
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Application filed by 蜂巢能源科技(无锡)有限公司 filed Critical 蜂巢能源科技(无锡)有限公司
Priority to EP22779074.8A priority Critical patent/EP4318745A1/en
Publication of WO2022206894A1 publication Critical patent/WO2022206894A1/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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • 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
    • 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
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/107—Primary casings; Jackets or wrappings characterised by their shape or physical structure having curved cross-section, e.g. round or elliptic
    • 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
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/109—Primary casings; Jackets or wrappings characterised by their shape or physical structure of button or coin shape
    • 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
    • H01M50/148—Lids or covers characterised by their shape
    • H01M50/152—Lids or covers characterised by their shape for cells having curved cross-section, e.g. round or elliptic
    • 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
    • H01M50/172—Arrangements of electric connectors penetrating the casing
    • H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
    • H01M50/179—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for cells having curved cross-section, e.g. round or elliptic
    • 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
    • H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
    • 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
    • H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. 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
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/545—Terminals formed by the casing of the cells
    • 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
    • H01M50/543—Terminals
    • H01M50/552—Terminals characterised by their shape
    • H01M50/559—Terminals adapted for cells having curved cross-section, e.g. round, elliptic or button cells
    • 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 application relates to the technical field of lithium ion batteries, and in particular, to a cylindrical battery.
  • lithium-ion batteries are widely used as power batteries in the field of electric vehicles.
  • the structural part of the lithium-ion battery is also an important part of the lithium-ion power battery. It not only provides a guarantee for the lithium-ion battery in terms of safety and reliability, but also takes into account the connection between the internal chemical system of the lithium-ion battery and the external modules.
  • the requirements for fast charging and discharging of batteries are getting higher and higher, and the requirements for the overcurrent capability and safety capability of lithium batteries are also getting higher and higher, so the high rate performance of structural parts is the general trend.
  • the positive and negative electrodes of the existing lithium-ion battery are located at opposite ends of the casing, which is not conducive to the design and welding of the busbars of the external modules.
  • the purpose of this application is to propose a cylindrical battery, which enables the positive and negative electrodes of the battery to be located on the same side, which facilitates the design and welding of the busbars of the external modules.
  • a cylindrical battery comprising: a casing, including a hollow cylindrical cavity and a semi-closed end plate for limiting the axial end of the hollow cylindrical cavity, and a semi-closed end plate is provided in the middle position. an opening concentric with the hollow cylindrical cavity; the electric core is accommodated in the hollow cylindrical cavity, and the two axial ends are respectively provided with a positive electrode and a negative electrode close to the semi-closed end plate; the connecting piece assembly is attached to the semi-closed end plate and the semi-closed end plate.
  • the negative electrodes are electrically connected between the negative electrodes and the casing.
  • the connecting piece assembly includes a first connecting piece and a second connecting piece that are attached to each other and fixedly connected, the first connecting piece is attached to the negative electrode and is fixed to the negative electrode by laser welding; the second connecting piece is attached to the semi-closed The end plate is fixed with the semi-closed end plate by laser welding.
  • the first connecting piece is a nickel-plated copper connecting piece
  • the second connecting piece is a nickel-plated steel plate.
  • the surface of the second connecting piece away from the first connecting piece is provided with an annular convex step, and the step divides the surface of the first connecting piece into an inner connecting area and an outer connecting area, and the outer connecting area is attached to the semi-closed end plate. closed, and the step and inner connecting area close the opening.
  • the negative electrode is provided with a liquid injection hole
  • the connecting piece assembly is provided with a through hole aligned with the liquid injection hole, and the through hole is located in the inner connection area
  • the battery also includes a sealing component for sealing the through hole, and the sealing component is provided in the The inner connecting area is adapted to the shape of the inner connecting area.
  • the outer connecting area is attached to the lower surface of the semi-closed end plate, the side wall of the step is located inside the side wall of the semi-closed end plate, and the upper surface of the step is flush with the upper surface of the semi-closed end plate.
  • the sealing component includes a PET patch and a sealing nickel sheet, the PET patch is attached to the through hole of the inner connection area, and the sealing nickel sheet is attached to the PET patch.
  • the lower surface of the sealing assembly is attached to the inner connecting area, and the upper surface of the sealing assembly is flush with the upper surface of the step.
  • the other end of the casing is an open end into which the power supply core is inserted
  • the battery includes a positive electrode cover plate fixedly connected to the positive electrode, and the positive electrode cover plate covers and closes the open end.
  • the battery core is cylindrical, and the casing is wrapped around the battery core and is adapted to the shape of the battery core.
  • the cylindrical battery described in this application has the following advantages:
  • the negative electrode of the battery cell and the semi-closed end plate are fixedly connected through the connecting piece assembly, so that the negative electrode of the battery cell can transmit electrical energy to the semi-closed end plate through the connecting piece assembly, so that the shell forms a negative electrode with negative electricity, so as to achieve the One end of the positive electrode of the battery cell and the shell form the effect that the positive electrode and the negative electrode are located on the same side.
  • the cylindrical battery of the present application is more conducive to the design and connection of the external module busbar .
  • FIG. 1 is a schematic diagram of an exploded structure of a battery according to an embodiment of the present application.
  • FIG. 2 is a partial cross-sectional structural schematic diagram of a battery according to an embodiment of the present application.
  • the terms “installed”, “connected”, “connected”, “fixed” and other terms should be understood in a broad sense, for example, it may be a fixed connection, a detachable connection, or an integral body; it may be a mechanical connection, or a It can be electrically connected or can communicate with each other; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal communication between two elements or the interaction relationship between the two elements, unless otherwise expressly defined.
  • the specific meanings of the above terms in this application can be understood according to specific situations.
  • FIG. 1 is a schematic diagram of an exploded structure of a cylindrical battery according to an embodiment of the present application.
  • FIG. 2 is a schematic partial half-section structure diagram of a cylindrical battery according to an embodiment of the present application.
  • a cylindrical battery 1 is provided, including: a casing 12 , including a hollow cylindrical cavity and a semi-closed spacer for limiting the axial end of the hollow cylindrical cavity
  • the end plate 121, the semi-closed end plate 121 is provided with an opening concentric with the hollow cylindrical cavity in the middle position; the cell 11 is accommodated in the hollow cylindrical cavity and the two axial ends are respectively provided with a positive electrode and a negative electrode close to the semi-closed end plate 121;
  • the connecting piece assembly 13 is attached and connected between the semi-closed end plate 121 and the negative electrode, and is electrically connected to the negative electrode and the casing 12 .
  • the battery core 11 can be accommodated in the hollow cylindrical cavity, and the negative electrode of the battery core 11 can be set in the hollow cylindrical cavity. It is close to one end of the semi-closed end plate 121, and is attached and connected between the semi-closed end plate 121 and the negative electrode through the connecting piece assembly 13, so that the negative electrode transmits electric energy to the semi-closed end plate 121 through the connecting piece assembly 13, so that the shell
  • the body 12 forms a negative electrode with negative electricity.
  • the positive and negative electrodes of the cylindrical battery 1 can be regarded as being on the same side, Therefore, when the external module bus bar needs to be connected to the battery, the positive electrode of the external module bus bar can be connected to the positive electrode of the battery cell 11 on the same side of the battery, and the negative electrode of the external module bus bar can be connected to the housing 12.
  • the cylindrical battery 1 of the present application is more conducive to the design and connection of the busbars of the external modules.
  • the semi-closed end plate 121 is formed by bending one axial end of the casing 12 in the direction of the hollow cylindrical cavity, and an opening concentric with the hollow cylindrical cavity is formed in the middle position of the semi-closed end plate 121, so that the casing 12 corresponds to the hollow cylindrical cavity.
  • One end of the semi-closed end plate 121 is in a semi-closed state, so that the axial limit of the battery cell 11 can be realized under the action of the semi-closed end plate 121 .
  • the battery includes a positive cover plate 15 fixedly connected to the positive electrode.
  • the surface of the positive electrode cover plate 15 away from the cell 11 is provided with a conductive sheet electrically connected to the positive electrode of the cell 11 , so as to facilitate the connection between the positive electrode of the external module bus bar and the conductive sheet.
  • External module busbars and batteries can be connected by resistance welding, laser welding, etc.
  • the battery cell 11 is cylindrical
  • the casing 12 is wrapped around the battery core 11 and is adapted to the shape of the battery core 11 , so that the overall structure of the battery is cylindrical, so as to facilitate the subsequent operation of the cylindrical battery 1 . use, as well as the design and connection of devices related to cylindrical battery 1.
  • the connecting piece 13 includes a first connecting piece 131 and a second connecting piece 132 that are attached to each other and are fixedly connected.
  • the first connecting piece 131 is attached to the negative electrode and is fixed to the negative electrode by laser welding;
  • the two connecting pieces 132 are attached to the semi-closed end plate 121 and fixed to the semi-closed end plate 121 by laser welding.
  • a laser welding spot for conducting electricity is formed between the first connecting piece 131 and the negative electrode, so as to The negative electrode and the first connecting piece 131 are electrically connected by laser welding.
  • the second connecting piece 132 By attaching the second connecting piece 132 to the semi-closed end plate 121 and fixing the second connecting piece 132 to the casing 12 by means of laser welding, the space between the second connecting piece 132 and the casing 12 is formed.
  • the conductive laser welding spot since the first connecting piece 131 and the second connecting piece 132 are attached and fixedly connected to each other, the current of the negative electrode of the cell 11 can pass through the laser welding between the first connecting piece 131 and the negative electrode.
  • the spot is transferred to the first connecting piece 131, but is transferred from the first connecting piece 131 to the second connecting piece 132, and finally the laser welding spot between the second connecting piece 132 and the semi-closed end plate 121 is transferred to the housing 12. , so that the case 12 forms a negatively charged negative electrode.
  • the first connecting piece 131 and the second connecting piece 132 are fixedly connected by laser welding, wherein the first connecting piece 131 is a copper nickel-plated connecting piece, and the second connecting piece 132 is a nickel-plated steel plate,
  • the first connecting piece 131 is a copper nickel-plated connecting piece
  • the second connecting piece 132 is a nickel-plated steel plate
  • the surface of the second connecting piece 132 away from the first connecting piece 131 is provided with an annular raised step 1321 , and the step 1321 divides the surface of the first connecting piece 131 into an inner connecting area 1322 and an outer connecting area 1323, the outer connecting area 1323 is attached to the semi-closed end plate 121, and the step 1321 and the inner connecting area 1322 are closed to the opening.
  • the surface of the second connection piece 132 is divided into an inner connection area 1322 and an outer connection area 1323 by the step 1321, so that the outer connection area 1323 can be attached to the semi-closed end plate 121, and the step 1321 and the inner connection area 1322 are divided into half
  • the opening on the closed end plate 121 is closed, so that the end of the casing 12 corresponding to the semi-closed end plate 121 is completely closed, so as to prevent dust and debris from entering the casing 12, and at the same time, it can also facilitate the semi-closed end plate.
  • Laser welding is performed at the position where the 121 and the external connection area 1323 are attached to form an electrical connection between the second connection piece 132 and the housing 12, so that the positive electrode and the negative electrode of the battery are located on the same side, which is convenient for the external module bus bar. Design and connect.
  • the outer connecting area 1323 is attached to the lower surface of the semi-closed end plate 121 , the side wall of the step 1321 is located inside the side wall of the semi-closed end plate 121 , and the upper surface of the step 1321 is connected to the semi-closed end plate 121 .
  • the upper surface of the end plate 121 is flush.
  • the second connection piece 132 By attaching the outer connecting area 1323 to the lower surface of the semi-closed end plate 121, and attaching the side wall of the step 1321 to the side wall of the semi-closed end, the second connection piece 132 can be connected in the horizontal direction of the casing 12 to the side wall of the semi-closed end.
  • a limit is formed in the vertical direction to prevent the second connecting piece 132 from shaking relative to the casing 12, and at the same time, it can also improve the sealing degree of the second connecting piece 132 to the semi-closed end plate 121, and the upper surface of the step 1321 is connected to the semi-closed end plate 121.
  • the upper surface of the board 121 is set to be flush, so as to prevent the steps 1321 from protruding from the surface of the casing 12 and affect the design and welding of the busbars of the external modules, thereby improving the overall aesthetics of the battery.
  • the negative electrode is provided with a liquid injection hole
  • the connecting piece assembly 13 is provided with a through hole 111 aligned with the liquid injection hole, and the through hole 111 is located in the inner connection area 1322;
  • the battery also includes a through hole for sealing
  • the sealing component 14 of 111, the sealing component 14 is arranged in the inner connecting area 1322 and is adapted to the shape of the inner connecting area 1322.
  • the electrolyte plays a role in decomposing electrons, and the liquid injection hole is opened on the connecting piece assembly 13 to align the position.
  • the through hole 111 is formed and the through hole 111 is located in the inner connection area 1322, so as to avoid sealing the liquid injection hole after the connecting sheet assembly 13 is welded to the negative electrode of the cell 11, resulting in the inability to inject electrolyte into the cell 11 through the liquid injection hole.
  • the connecting piece assembly 13 is welded and fixed with the negative electrode of the battery cell 11 and the semi-closed end plate 121 respectively, the electrolyte is injected through the liquid injection hole, and finally the sealing assembly 14 is fixed to the inner connecting area 1322, so that the sealing assembly 14 can pass through. Seal the injection hole to prevent electrolyte leakage.
  • the sealing assembly 14 is adapted to the shape of the inner connecting area 1322, so that the sealing effect of the sealing assembly 14 on the liquid injection hole can be improved.
  • the sealing component 14 includes a PET patch 141 and a sealing nickel sheet 142 , the PET patch 141 is attached to the through hole 111 of the inner connection area 1322 , and the sealing nickel sheet 142 is attached to the PET patch 141 superior.
  • the PET patch 141 By attaching the PET patch 141 to the through hole 111 of the inner connection area 1322 , the PET patch 141 seals the through hole 111 to prevent leakage of the electrolyte, and the sealed nickel sheet 142 is attached to the PET patch 141 to connect the sealing nickel sheet 142 to the inner connection area 1322 by means of laser welding, that is, the sealing nickel sheet 142 is fixedly connected to the second connecting sheet 132 to further prevent leakage of the electrolyte.
  • the lower surface of the sealing component 14 is abutted against the inner connecting area 1322 , and the upper surface of the sealing component 14 is flush with the upper surface of the step 1321 .
  • the lower surface of the sealing assembly 14 is attached to the inner connection area 1322, that is, the PET patch 141 and the sealing nickel sheet 142 are attached to the inner connection area 1322 at the same time, so as to improve the sealing degree of the sealing assembly 14 to the injection hole,
  • the upper surface of the sealing assembly 14 is set to be flush with the upper surface of the step 1321 , that is, the upper surface of the sealing nickel sheet 142 is set to be flush with the upper surface of the casing 12 to prevent the sealing assembly 14 from passing from the casing 12 .
  • the protruding surface affects the design and welding of the external module busbars and improves the overall aesthetics of the battery.
  • the size of the PET patch 141 is smaller than the size of the sealing nickel sheet 142, and the size of the sealing nickel sheet 142 is adapted to the size of the inner connection area 1322, so that after the PET patch 141 is attached to the inner connection area 1322, the PET The patch 141 does not completely cover the inner connection area 1322 , and can be attached to the inner connection area 1322 not covered by the PET patch 141 by sealing the nickel sheet 142 .

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Battery Mounting, Suspending (AREA)

Abstract

本申请涉及锂离子电池技术领域，公开了一种圆柱电池，包括：壳体，包括中空柱腔和用于对中空柱腔的轴向端限位的半封闭端板，半封闭端板中间位置开设有与所述中空柱腔同心的开口；电芯，容纳于中空柱腔内且轴向两端分别设有正极和靠近半封闭端板的负极；连接片组件，贴合连接于半封闭端板与负极之间并电连接负极与壳体。通过本申请的技术方案，使电池的正负极位于同一侧，便于外部模组汇流排的设计和焊接。

Description

一种圆柱电池
本申请要求在2021年03月31日提交中国专利局、申请号为202120661907.8、实用新型名称为“一种圆柱电池”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
本申请涉及锂离子电池技术领域，特别涉及一种圆柱电池。
背景技术
随着锂离子电池技术的日益成熟，锂离子电池作为动力电池广泛应用于电动汽车领域中。锂离子电池的结构件部分也是锂离子动力电池的重要组成部分，它不仅在安全可靠性方面为锂离子电池提供保障，同时也兼顾锂离子电池内部化学体系与外部模组的连接。随着行业的发展，对电池快速充放电的要求越来越高，对锂电池的过流能力以及安全能力的要求也越来越高，因此结构件的高倍率性能是大势所趋。然而，现有的锂离子电池的正负极位于壳体的相对两端，不利于外部模组汇流排的设计和焊接。
实用新型内容
本申请旨在提出一种圆柱电池，能够使电池的正负极位于同一侧，便于外部模组汇流排的设计和焊接。
为达到上述目的，本申请提供了一种圆柱电池，包括：壳体，包括中空柱腔和用于对中空柱腔的轴向端限位的半封闭端板，半封闭端板中间位置开设有与所述中空柱腔同心的开口；电芯，容纳于中空柱腔内且轴向两端分别设有正极和靠近半封闭端板的负极；连接片组件，贴合连接于半封闭端板与负极之间并电连接负极与壳体。
可选地，连接片组件包括互相贴合并固定连接的第一连接片和第二连接片，第一连接片贴合于负极上并通过激光焊接与负极固定；第二连接片贴合于半封闭端板并通过激光焊接与半封闭端板固定。
可选地，第一连接片为铜镀镍连接片，第二连接片为镀镍钢板。
可选地，第二连接片远离第一连接片的表面设置有环形凸起的台阶，台阶将第一连接片的表面划分为内连接区和外连接区，外连接区与半封闭端板贴合，并使台阶和内连接区封闭开口。
可选地，负极开设有注液孔，连接片组件开设有与注液孔对位的通孔，且通孔位于内连接区；电池还包括用于密封通孔的密封组件，密封组件设置于内连接区内并与内连接区形状适配。
可选地，外连接区贴合于半封闭端板的下表面，台阶的侧壁位于半封闭端板的侧壁的内侧，且台阶的上表面与半封闭端板的上表面齐平。
可选地，密封组件包括PET贴片和密封镍片，PET贴片贴合于内连接区的通孔处，密封镍片贴合于PET贴片上。
可选地，密封组件的下表面贴合于内连接区，密封组件的上表面与台阶的上表面齐平。
可选地，壳体另一端为供电芯插入的开口端，电池包括与正极固定连接的正极盖板，正极盖板盖合并封闭开口端。
可选地，电芯为圆柱形，壳体包裹于电芯四周并与电芯形状适配。
相对于现有技术，本申请所述的圆柱电池具有以下优势：
电芯负极与半封闭端板之间通过连接片组件进行固定连接，从而可使电芯负极通过连接片组件传递电能至半封闭端板，进而使壳体形成带有负电的负极，从而达到使电池在电芯正极的一端和壳体形成正极和负极位于同一侧的效果，相对于现有技术中正负极位于两端的电池而言，本申请的圆柱电池更利于外部模组汇流排的设计和连接。
本申请的其它特征和优点将在随后的具体实施方式部分予以详细说明。
附图说明
构成本申请的一部分的附图用来提供对本申请的进一步理解，本申请的示意性实施方式及其说明用于解释本申请，并不构成对本申请的不当限定。在附图中：
图1是根据本申请一实施例的电池的爆炸结构示意图；
图2是根据本申请一实施例的电池的局部剖视结构示意图。
附图标记说明：
1圆柱电池
11电芯                                 12壳体
13连接片组件                           14密封组件
15正极盖板
111通孔
121半封闭端板                          122开口端
131第一连接片                          132第二连接片
1321台阶                               1322内连接区
1323外连接区
141 PET贴片                            142密封镍片
具体实施方式
需要说明的是，在不冲突的情况下，本申请中的实施方式及实施方式中的特征可以相互组合。
在本申请的实施方式中所提到的“长度”、“宽度”、“上”、“下”、“前”、“后”、“左”、“右”、“顶”、“底”“内”、“外”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本申请和简化描述，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。
另外，术语“安装”、“相连”、“连接”、“固定”等术语应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或成一体；可以是机械连接，也可以是电连接或彼此可通讯；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通或两个元件的相互作用关系，除非另有明确的限定。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本申请中的具体含义。
下面将参考附图并结合实施方式来详细说明本申请。
图1是本根据申请一实施例的圆柱电池的爆炸结构示意图。图2是根据本申请一实施例的圆柱电池的局部半剖结构示意图。如图1-图2所示，在本申请的实施例中，提供一种圆柱电池1，包括：壳体12，包括中空柱腔和用于对中空柱腔的轴向端限位的半封闭端板121，半封闭端板121中间位置开设有与中空柱腔同心的开口；电芯11，容纳于中空柱腔内且轴向两端分别设有正极和靠近半封闭端板121的负极；连接片组件13，贴合连接于半封闭端板121与负极之间并电连接负极与壳体12。
通过将壳体12设置为中空柱腔和用于对中空的轴向端限位的半封闭端板121形式，从而可使电芯11容纳于中空柱腔内，将电芯11的负极设于靠近半封闭端板121的一端，并通过连接片组件13贴合连接于半封闭端板121与负极之间，以使负极通过连接片组件13传递电能至半封闭端板121上，从而使壳体12形成带有负电的负极，由于电芯11的正极朝向壳体12的另一侧，且壳体12本身可看作为负极，因此，圆柱电池1的正负极可视为处于同一侧，从而在需要将外部模组汇流排连接于电池上时，可在电池的同一侧将外部模组汇流排的正极与电芯11的正极进行连接，将外部模组汇流排的负极与壳体12进行连接，相对于现有技术中正负极位于两端的电 池而言，本申请的圆柱电池1更利于外部模组汇流排的设计和连接。
可以理解，半封闭端板121由壳体12轴向的一端向中空柱腔的方向折弯形成，并在半封闭端板121的中间位置形成与中空柱腔同心的开口，使壳体12对应半封闭端板121的一端呈半封闭状态，进而可在半封闭端板121的作用下实现对电芯11的轴向限位，壳体12远离半封闭端板121的一端为开口端122，以便于将电芯11从开口端122，电池包括与正极固定连接的正极盖板15，正极盖板15盖合并封闭开口端122，从而起到防止灰尘杂物进入壳体12内的作用。在本申请的实施例中，正极盖板15远离电芯11的表面设置有与电芯11正极电连接的导电片，以便于外部模组汇流排的正极与导电片进行连接。外部模组汇流排与电池可通过电阻焊、激光焊接等方式进行连接。
在本申请的实施例中，电芯11为圆柱形，壳体12包裹于电芯11四周并与电芯11形状适配，从而使电池整体结构呈圆柱形，以便于后续对圆柱电池1的使用，以及与圆柱电池1相关器件的设计与连接。
在本申请的实施例中，连接片组件13包括互相贴合并固定连接的第一连接片131和第二连接片132，第一连接片131贴合于负极上并通过激光焊接与负极固定；第二连接片132贴合于半封闭端板121并通过激光焊接与半封闭端板121固定。
通过将第一连接片131贴合于负极上，并通过激光焊接的方式使第一连接片131与负极固定，从而在第一连接片131和负极之间形成用于导电的激光焊点，以使负极与第一连接片131通过激光焊点形成电连接。通过将第二连接片132贴合于半封闭端板121上，并通过激光焊接的方式使第二连接片132与壳体12固定，从而在第二连接片132和壳体12之间形成用于导电的激光焊点，由于第一连接片131与第二连接片132为互相贴合且固定连接的，因此，电芯11负极的电流可通过第一连接片131和负极之间的激光焊点传递至第一连接片131上，然而由第一连接片131传递至第二连接片132上，最后第二连接片132和半封闭端板121之间的激光焊点传递至壳体12上，从而使壳体12形成带有负电的负极。
在本申请的实施例中，第一连接片131和第二连接片132通过激光焊接达到固定连接，其中，第一连接片131为铜镀镍连接片，第二连接片132为镀镍钢板，如此设计，可提高电芯11传递电流至壳体12上的传递速度以及电流的稳定性。
在本申请的实施例中，第二连接片132远离第一连接片131的表面设置有环形凸起的台阶1321，台阶1321将第一连接片131的表面划分为内连接区1322和外连接区1323，外连接区1323与半封闭端板121贴合，并使台阶1321和内连接区1322封闭开口。
通过台阶1321将第二连接片132的表面划分为内连接区1322与外连接区1323，从而可使外连接区1323与半封闭端板121贴合，并由台阶1321和内连接区1322对半封闭端板121上的开口进行封闭，使壳体12对应半封闭端板121的一端完全封闭，从而起到防止灰尘杂物进入壳体12内的作用，同时，还可便于对半封闭端板121和外连接区1323贴合的位置进行激光焊接，使第二连接片132与壳体12之间形成电性导通，进而使电池的正极和负极位于同一侧，便于外部模组汇流排的设计与连接。
在本申请的实施例中，外连接区1323贴合于半封闭端板121的下表面，台阶1321的侧壁位于半封闭端板121的侧壁的内侧，且台阶1321的上表面与半封闭端板121的上表面齐平。
通过将外连接区1323贴合于半封闭端板121的下表面，并且将台阶1321的侧壁贴合于半封闭端的侧壁，从而可使第二连接片132在壳体12的水平方向和竖直方向形成限位，防止第二连接片132相对壳体12发生晃动，同时，还能提高第二连接片132对半封闭端板121的密封程度，将台阶1321的上表面与半封闭端板121的上表面设为齐平，以避免台阶1321从壳体12表面凸出而影响外部模组汇流排的设计与焊接，提高电池的整体美观度。
在本申请的实施例中，负极开设有注液孔，连接片组件13开设有与注液孔对位的通孔111，且通孔111位于内连接区1322；电池还包括用于密封通孔111的密封组件14，密封组件14设置于内连接区1322内并与内连接区1322形状适配。
通过在负极开设注液孔，以便于通过注液孔对电芯11内部注入电解液，进而，通过电解液起到对分解电子的作用，通过在连接片组件13上开设于注液孔对位的通孔111，并使通孔111位于内连接区1322，从而可避免连接片组件13焊接于电芯11负极之后密封注液孔，导致无法对通过注液孔对电芯11注入电解液。将连接片组件13分别与电芯11负极和半封闭端板121进行焊接固定之后，再通过注液孔注入电解液，最后通过将密封组件14固定于内连接区1322，从而可通过密封组件14将注液孔进行密封，防止电解液泄露。密封组件14与内连接区1322的形状适配，从而可提高密封组件14对注液孔的密封效果。
在本申请的实施例中，密封组件14包括PET贴片141和密封镍片142，PET贴片141贴合于内连接区1322的通孔111处，密封镍片142贴合于PET贴片141上。
通过将PET贴片141贴合于内连接区1322的通孔111处，以使PET贴片141对通孔111进行密封，防止电解液发生泄露，将密封镍片142贴合于PET贴片141上，以便于通过激光焊接的方式将密封镍片142与内连接区1322进行固定连接，也即，将密封镍片142与第二连接片132进行固定连接，进一步防止电解液发生泄露。
在本申请的实施例中，密封组件14的下表面贴合于内连接区1322，密封组件14的上表面与台阶1321的上表面齐平。将密封组件14的下表面贴合于内连接区1322，即为，将PET贴片141和密封镍片142同时贴合于内连接区1322，以提高密封组件14对注液孔的密封程度，将密封组件14的上表面设为与台阶1321的上表面齐平，即为，将密封镍片142的上表面设为与壳体12的上表面齐平，以避免密封组件14从壳体12表面凸出而影响到外部模组汇流排的设计与焊接，提高电池的整体美观度。
可以理解，PET贴片141的尺寸小于密封镍片142的尺寸，密封镍片142的尺寸与内连接区1322的尺寸适配，从而在将PET贴片141贴合于内连接区1322后，PET贴片141并没有完全覆盖内连接区1322，可通过密封镍片142贴合于PET贴片141未覆盖的内连接区1322上。
以上所述仅为本申请的较佳实施方式而已，并不用以限制本申请，凡在本申请的精神和原则之内所作的任何修改、等同替换、改进等，均应包含在本申请的保护范围之内。

Claims (10)

  1. 一种圆柱电池，其特征在于，包括：
    壳体(12)，包括中空柱腔和用于对所述中空柱腔的轴向端限位的半封闭端板(121)，所述半封闭端板(121)中间位置开设有与所述中空柱腔同心的开口；
    电芯(11)，容纳于所述中空柱腔内且轴向两端分别设有正极和靠近所述半封闭端板(121)的负极；
    连接片组件(13)，贴合连接于所述半封闭端板(121)与所述负极之间并电连接所述负极与所述壳体(12)。
  2. 根据权利要求1所述的圆柱电池，其特征在于，所述连接片组件(13)包括互相贴合并固定连接的第一连接片(131)和第二连接片(132)，所述第一连接片(131)贴合于所述负极上并通过激光焊接与所述负极固定；所述第二连接片(132)贴合于所述半封闭端板(121)并通过激光焊接与所述半封闭端板(121)固定。
  3. 根据权利要求2所述的圆柱电池，其特征在于，所述第一连接片(131)为铜镀镍连接片，所述第二连接片(132)为镀镍钢板。
  4. 根据权利要求2所述的圆柱电池，其特征在于，所述第二连接片(132)远离所述第一连接片(131)的表面设置有环形凸起的台阶(1321)，所述台阶(1321)将所述第一连接片(131)的表面划分为内连接区(1322)和外连接区(1323)，所述外连接区(1323)与所述半封闭端板(121)贴合，并使所述台阶(1321)和所述内连接区(1322)封闭所述开口。
  5. 根据权利要求4所述的圆柱电池，其特征在于，所述负极开设有注液孔，连接片组件(13)开设有与所述注液孔对位的通孔(111)，且所述通孔(111)位于所述内连接区(1322)；所述圆柱电池还包括用于密封 所述通孔(111)的密封组件(14)，所述密封组件设置于所述内连接区(1322)内并与所述内连接区(1322)形状适配。
  6. 根据权利要求4所述的圆柱电池，其特征在于，所述外连接区(1323)贴合于所述半封闭端板(121)的下表面，所述台阶(1321)的侧壁位于所述半封闭端板(121)的侧壁的内侧，且所述台阶(1321)的上表面与所述半封闭端板(121)的上表面齐平。
  7. 根据权利要求5所述的圆柱电池，其特征在于，所述密封组件(14)包括PET贴片(141)和密封镍片(142)，所述PET贴片(141)贴合于所述内连接区(1322)的所述通孔(111)处，所述密封镍片(142)贴合于所述PET贴片(141)上。
  8. 根据权利要求5所述的圆柱电池，其特征在于，所述密封组件(14)的下表面贴合于所述内连接区(1322)，所述密封组件(14)的上表面与所述台阶(1321)的上表面齐平。
  9. 根据权利要求1所述的圆柱电池，其特征在于，所述壳体(12)另一端为供所述电芯(11)插入的开口端(122)，所述圆柱电池包括与所述正极固定连接的正极盖板(15)，所述正极盖板(15)盖合并封闭所述开口端(122)。
  10. 根据权利要求1-9任一项所述的圆柱电池，其特征在于，所述电芯3(11)为圆柱形，所述壳体(12)包裹于所述电芯(11)四周并与所述电芯(11)形状适配。
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CN214336793U (zh) * 2021-03-31 2021-10-01 蜂巢能源科技(无锡)有限公司 一种圆柱电池

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WO2025055023A1 (zh) * 2023-09-13 2025-03-20 重庆太蓝新能源有限公司 电池单元及其制备方法、环形电池、电池、电池模组和用电设备

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