WO2022237030A1 - 动力电池盖及动力电池 - Google Patents

动力电池盖及动力电池 Download PDF

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Publication number
WO2022237030A1
WO2022237030A1 PCT/CN2021/118760 CN2021118760W WO2022237030A1 WO 2022237030 A1 WO2022237030 A1 WO 2022237030A1 CN 2021118760 W CN2021118760 W CN 2021118760W WO 2022237030 A1 WO2022237030 A1 WO 2022237030A1
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WO
WIPO (PCT)
Prior art keywords
power battery
copper
battery cover
aluminum composite
injection molded
Prior art date
Application number
PCT/CN2021/118760
Other languages
English (en)
French (fr)
Inventor
励建炬
Original Assignee
深圳市科达利实业股份有限公司
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Filing date
Publication date
Application filed by 深圳市科达利实业股份有限公司 filed Critical 深圳市科达利实业股份有限公司
Priority to GB2217678.8A priority Critical patent/GB2610954A/en
Priority to KR1020227032989A priority patent/KR20220155431A/ko
Priority to SE2250985A priority patent/SE2250985A1/en
Publication of WO2022237030A1 publication Critical patent/WO2022237030A1/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
    • H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
    • H01M50/138—Primary casings, jackets or wrappings of a single cell or a single battery adapted for specific cells, e.g. electrochemical cells operating at high temperature
    • 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
    • H01M50/547—Terminals characterised by the disposition of the terminals on the cells
    • H01M50/55—Terminals characterised by the disposition of the terminals on the cells on the same side of the cell
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • 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
    • 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
    • H01M50/183—Sealing members
    • H01M50/184—Sealing members characterised by their shape or structure
    • 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
    • H01M50/183—Sealing members
    • H01M50/186—Sealing members characterised by the disposition of the sealing members
    • H01M50/188—Sealing members characterised by the disposition of the sealing members the sealing members being arranged between the lid and terminal
    • 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
    • H01M50/543—Terminals
    • 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
    • H01M50/547—Terminals characterised by the disposition of the terminals on 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
    • H01M50/562—Terminals characterised by the material
    • 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
    • H01M50/564—Terminals characterised by their manufacturing process
    • 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
    • H01M50/564—Terminals characterised by their manufacturing process
    • H01M50/567—Terminals characterised by their manufacturing process by fixing means, e.g. screws, rivets or bolts
    • 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
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/588—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries outside the batteries, e.g. incorrect connections of terminals or busbars
    • 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
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
    • H01M50/593—Spacers; Insulating plates
    • 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
    • H01M50/172—Arrangements of electric connectors penetrating the casing
    • H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
    • H01M50/176—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for prismatic or rectangular 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 power batteries, for example, to a power battery cover and a power battery.
  • the pole In the field of power battery technology, the pole is a part in the power battery cover that connects the inside and outside of the battery. One end of the pole is connected to the external circuit of the power battery, and the other end of the pole is connected to the internal cell of the power battery.
  • the negative current collector is made of copper foil. Therefore, the negative pole of the power battery cover must be made of pure copper to ensure the performance of the internal cells of the battery, so that the battery can realize the function of charging and discharging.
  • the embodiment of the present application discloses a power battery cover and a power battery to deal with the risk that the power battery is prone to failure due to the poor sealing effect of the sealing ring in the copper-aluminum composite pole.
  • a power battery cover including:
  • a copper-aluminum composite pole the copper-aluminum composite pole is arranged through the top cover sheet, the copper-aluminum composite pole includes a copper base part and an aluminum base part connected to each other, and the copper base part includes a first base part and a first cylindrical part, the aluminum base part includes a second cylindrical part and a third cylindrical part, the diameter of the second cylindrical part is equal to that of the first cylindrical part, and the first cylindrical part part and the end face of the second column part are connected to form a composite connection surface;
  • a sealing element is interposed between the copper-aluminum composite pole and the top cover sheet, and the sealing element seals and covers the composite connecting surface;
  • An upper injection molded part, the upper injection molded part is arranged above the top cover sheet, and the copper-aluminum composite pole is arranged through the upper injection molded part;
  • a lower injection molded part, the lower injection molded part is arranged under the top cover sheet, and the lower injection molded part is sandwiched between the top cover sheet and the copper-aluminum composite pole.
  • the embodiment of the present application discloses a power battery, including the power battery cover as described above.
  • Fig. 1 is a schematic structural diagram of a power battery cover provided by an embodiment of the present application
  • Fig. 2 is an exploded view of a power battery cover provided in the embodiment of the present application.
  • Fig. 3 is a left view of a power battery cover provided by the embodiment of the present application.
  • FIG. 4 is a schematic structural diagram of a seal provided in an embodiment of the present application.
  • Fig. 5 is a partial cross-sectional view at A-A in Fig. 3 .
  • Copper-aluminum composite pole 11.
  • Aluminum base part 112.
  • Second column part 113.
  • Third column part 12.
  • First base part 121.
  • First column part 2, top cover sheet; 3, sealing member; 31, first sealing part; 32, second sealing part; 33, third sealing part; 4, upper injection molding part; 5, lower injection molding part; 6, riveting block; 61, the first step hole; 62, the second step hole; 63, counterbore.
  • pure copper materials have the disadvantages of heavy weight and high material cost.
  • a copper-aluminum composite pole can be provided, and pure aluminum materials can be used to connect the external circuit of the power battery to deal with the problems caused by pure copper.
  • the negative pole of the material is heavy and the material cost is high.
  • connection surface of the copper-aluminum composite pole is usually located above or below the sealing ring, and this kind of arrangement cannot play a good sealing effect.
  • the terms “center”, “upper”, “lower”, “left”, “right”, “vertical”, “horizontal”, “inner”, “outer”, etc. indicate orientation or position The relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the application and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation.
  • the terms “first” and “second” are only used for distinguishing descriptions, and should not be understood as indicating or implying relative importance.
  • first position and second position are two different positions, and "above”, “above” and “above” the first feature on the second feature include that the first feature is on the second feature. Directly above and obliquely above, or simply means that the first feature level is higher than the second feature. "Below”, “under” and “under” the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or simply means that the first feature is less horizontally than the second feature.
  • connection should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral Connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediary, and it can be the internal communication of two components.
  • this embodiment provides a power battery cover.
  • the power battery cover includes a copper-aluminum composite pole 1, a top cover sheet 2, a seal 3, an upper injection molded part 4 and a lower injection molded part 5, copper
  • the aluminum composite pole 1 is arranged through the top cover sheet 2, the upper injection molded part 4 and the lower injection molded part 5, wherein the upper injection molded part 4 is arranged above the top cover sheet 2, the lower injection molded part 5 is arranged under the top cover sheet 2, and the lower injection molded part 5 is arranged under the top cover sheet 2.
  • the injection molding part 5 is sandwiched between the top cover sheet 2 and the copper-aluminum composite pole 1 .
  • the copper-aluminum composite pole 1 includes an aluminum matrix part 12 and an aluminum matrix part 11 connected to each other, the aluminum matrix part 12 is connected with the negative electrode current collector inside the battery cell of the power battery, and the aluminum matrix part 11 is connected with the external circuit of the power battery, Therefore, the defects of heavy weight and high cost caused by using pure copper material as the negative pole in the power battery cover can be dealt with, and the weight of the power battery can be reduced while ensuring the performance of the battery, while reducing the cost.
  • the aluminum base part 12 includes a first base part 120 and a first cylindrical part 121
  • the aluminum base part 11 includes a second cylindrical part 112 and a third cylindrical part 113
  • the second cylindrical part 112 and the third cylindrical part 113 The diameters of the first column parts 121 are equal
  • a composite connection surface is formed between the aluminum base part 11 and the aluminum base part 12
  • the sealing part 3 is interposed between the copper-aluminum composite pole 1 and the top cover sheet 2, and the sealing part 3 Seal wraps composite connection surfaces.
  • the sealing member 3 can seal the composite connection surface of the copper-aluminum composite pole 1, avoiding the contact between the electrolyte and the aluminum material in the copper-aluminum composite pole 1, thereby affecting the performance of the power battery cell and improving The reliability of the use of copper-aluminum composite pole 1 is guaranteed.
  • the aluminum base part 11 and the aluminum base part 12 may be connected by friction welding or riveting, or other connection methods.
  • the sealing member 3 includes a cylindrical first sealing portion 31 , the first sealing portion 31 is sheathed outside the copper-aluminum composite pole 1 , and the first sealing portion 31 It is closely attached to the copper-aluminum composite pole 1, and the first sealing part 31 seals and covers the composite connecting surface, thereby realizing the sealing effect of the sealing member 3 on the copper-aluminum composite pole 1, and, because the first sealing part 31 It has a cylindrical structure, and can also play a role in limiting the copper-aluminum composite pole 1 and supporting the upper injection molded part 4, thereby protecting the composite connection surface of the copper-aluminum composite pole 1 in subsequent processing and use. There will be no misalignment in the process.
  • the sealing member 3 includes an annular second sealing portion 32, the lower end surface of the second sealing portion 32 is closely attached to the upper end surface of the first base portion 120 of the aluminum base portion 12, and the second sealing portion 32 seals the aluminum The upper end surface of the first base portion 120 of the base portion 12 .
  • Fig. 5 is a partial cross-sectional view at A-A in Fig. 3, cut from the vertical direction of the structure shown in Fig. 3, and the observation direction is the arrow direction of A.
  • first sealing part 31 and the second sealing part 32 are integrally formed. In this way, the processing process of the sealing member 3 can be simplified and the installation is convenient.
  • the sealing member 3 further includes an annular third sealing portion 33.
  • the sealing member 3 can be discharged to the surrounding when it is under pressure until it is compressed to the required compression. amount, thereby improving the sealing reliability of the seal 3.
  • the power battery cover in this embodiment fixes the copper-aluminum composite pole 1 by stamping, and selects the upper end surface of the third cylinder part 113 as the stamping surface, as shown in Fig. 2 and Fig. 5 .
  • the power battery cover in this embodiment also includes a riveting block 6, which is arranged above the upper injection molded part 4, and one end of the punching surface of the third cylinder part 113 is set through the riveting block 6, and at the same time, the riveting block 6 is provided with a connecting And the first stepped hole 61 and the second stepped hole 62 are coaxially distributed, and the third column portion 113 is disposed through the first stepped hole 61 .
  • a counterbore 63 is further provided on the riveting block 6 , and the counterbore 63 communicates with the first stepped hole 61 and the second stepped hole 62 and is arranged coaxially.
  • the upper injection molded part 4 is provided with an accommodating groove, and the riveting block 6 can be placed in the accommodating groove, thereby reducing the overall thickness of the power battery cover and freeing up more space for the battery cells of the power battery.
  • the large installation space improves the energy density of the power battery.
  • the top cover sheet 2 has an accommodating cavity formed on the side away from the upper injection molded part 4, and the accommodating cavity can accommodate the aluminum base part 12.
  • This embodiment also provides a power battery, including the above-mentioned power battery cover, wherein the aluminum base part 12 of the copper-aluminum composite pole 1 in the power battery cover is connected to the negative electrode current collector inside the power battery cell, and the copper-aluminum composite pole The aluminum base part 11 of the column 1 is connected to the external circuit of the power battery, thereby reducing the weight of the power battery and reducing the cost while ensuring the performance of the battery.
  • the power battery disclosed in the embodiment of the present application reduces the weight of the whole power battery, reduces the cost, and improves the reliability of the power battery while ensuring the performance of the power battery.

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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)
  • Mechanical Engineering (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Electromechanical Clocks (AREA)
  • Battery Mounting, Suspending (AREA)

Abstract

本申请涉及动力电池技术领域，公开了一种动力电池盖及动力电池，该动力电池盖包括铜铝复合极柱、顶盖片、密封件、上注塑件和下注塑件，铜铝复合极柱穿过顶盖片、上注塑件和下注塑件设置，其中，铜铝复合极柱包括互相连接的铜基体部和铝基体部，铝基体部与铜基体部之间形成有复合连接面，由密封件密封包覆复合连接面。

Description

动力电池盖及动力电池
本公开要求在2021年05月14日提交中国专利局、申请号为202121031942.8的中国专利申请的优先权，以上申请的全部内容通过引用结合在本公开中。
技术领域
本申请涉及动力电池技术领域，例如涉及一种动力电池盖及动力电池。
背景技术
在动力电池技术领域，极柱是动力电池盖中连通电池内外的部件，极柱的一端与动力电池的外部电路连接，极柱的另一端与动力电池的内部电芯连接，由于电芯内部的负极集流片为铜箔材料，因此，动力电池盖的负极柱需采用纯铜材料才能保证电池内部电芯的使用性能，从而使电池能够实现充放电的功能，
发明内容
本申请实施例公开了一种动力电池盖及动力电池，以应对铜铝复合极柱中，密封圈密封效果不好，动力电池容易失效的风险。
第一方面，本申请实施例公开了一种动力电池盖，包括：
顶盖片；
铜铝复合极柱，所述铜铝复合极柱穿过所述顶盖片设置，所述铜铝复合极柱包括互相连接的铜基体部和铝基体部，所述铜基体部包括第一基体部和第一柱体部，所述铝基体部包括第二柱体部和第三柱体部，所述第二柱体部与所述第一柱体部直径相等，所述第一柱体部和所述第二柱体部端面连接形成复合连接面；
密封件，所述密封件夹设于所述铜铝复合极柱与所述顶盖片之间，且所述密封件密封包覆所述复合连接面；
上注塑件，所述上注塑件设置于所述顶盖片上方，所述铜铝复合极柱穿过上注塑件设置；以及
下注塑件，所述下注塑件设置于所述顶盖片下方，所述下注塑件夹设于所述顶盖片与所述铜铝复合极柱之间。
第二方面，本申请实施例公开了一种动力电池，包括如上所述的动力电池盖。
附图说明
图1为本申请实施例提供的一种动力电池盖的结构示意图；
图2为本申请实施例提供的一种动力电池盖的爆炸图；
图3为本申请实施例提供的一种动力电池盖的左视图；
图4为本申请实施例提供的密封件的结构示意图；
图5为图3中A-A处的部分剖面图。
附图标记：
1、铜铝复合极柱；11、铝基体部，112、第二柱体部，113、第三柱体部；12、铜基体部，120、第一基体部，121、第一柱体部；2、顶盖片；3、密封件；31、第一密封部；32、第二密封部；33、第三密封部；4、上注塑件；5、下注塑件；6、铆接块；61、第一台阶孔；62、第二台阶孔；63、沉孔。
具体实施方式
就相关技术而言，纯铜材料具有重量大，材料成本高的缺点，为了克服此缺点，可提供一种铜铝复合极柱，并采用纯铝材料连接动力电池的外电路，以应对纯铜材料的负极柱重量重、材料成本高的状况。
而相关技术中的铜铝复合极柱的装配方法中，铜铝复合极柱的连接面通常位于密封圈的上方或下方，此类设置方式不能起到很好的密封作用，一旦电解液渗入，与铜铝复合极柱的铝材料接触，将会影响动力电池内电芯的性能，造成动力电池失效。
因此，亟需提供一种动力电池盖及动力电池，能够在保证电池使用性能的情况下，减轻电池的重量，并降低成本。
本申请实施例公开了一种动力电池盖及动力电池，下面将结合附图对本申请实施例进行清楚、完整地描述。
基于本申请中的实施例，本领域普通技术人员在没有做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。
在本申请的描述中，术语“中心”、“上”、“下”、“左”、“右”、“竖直”、“水平”、“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。此外，术语“第一”、“第二”、仅用于区别描述，而不能理解为指示或暗示相对重要性。其中，术语“第一位置”和“第二位置”为两个不同的位置，而且，第 一特征在第二特征“之上”、“上方”和“上面”包括第一特征在第二特征正上方和斜上方，或仅仅表示第一特征水平高度高于第二特征。第一特征在第二特征“之下”、“下方”和“下面”包括第一特征在第二特征正下方和斜下方，或仅仅表示第一特征水平高度小于第二特征。
在本申请的描述中，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是机械连接，也可以是电连接；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。对于本领域的普通技术人员而言，可以结合具体情况理解上述术语在本申请中的具体含义。
下面描述本申请的实施例，所述实施例的示例在附图中示出，其中自始至终相同或类似的标号表示相同或类似的元件或具有相同或类似功能的元件。
如图1～图3所示，本实施例提供一种动力电池盖，动力电池盖包括铜铝复合极柱1、顶盖片2、密封件3、上注塑件4和下注塑件5，铜铝复合极柱1穿过顶盖片2、上注塑件4和下注塑件5设置，其中，上注塑件4设置于顶盖片2上方，下注塑件5设置于顶盖片2下方，下注塑件5夹设于顶盖片2与铜铝复合极柱1之间。铜铝复合极柱1包括互相连接的铝基体部12和铝基体部11，铝基体部12与动力电池的电芯内部的负极集流片连接，铝基体部11与动力电池的外电路连接，由此，可应对动力电池盖中采用纯铜材料作为负极柱所造成的重量重、成本高的缺陷，在保证电池使用性能的情况下，减轻了动力电池的重量，同时降低了成本。
在一实施例中，铝基体部12包括第一基体部120和第一柱体部121，铝基体部11包括第二柱体部112和第三柱体部113，第二柱体部112与第一柱体部121直径相等，铝基体部11与铝基体部12之间形成有复合连接面，密封件3夹设于铜铝复合极柱1与顶盖片2之间，且密封件3密封包覆复合连接面。通过此种设置，密封件3可将铜铝复合极柱1的复合连接面进行密封，避免了电解液与铜铝复合极柱1中的铝材料接触，从而影响动力电池电芯的性能，提高了铜铝复合极柱1使用的可靠性。
在一实施例中，铝基体部11与铝基体部12可通过摩擦焊或铆接等工艺进行连接，也可以采用其他连接方式进行连接。
在一实施例中，如图4和图5所示，密封件3包括呈筒状的第一密封部31，第一密封部31套设于铜铝复合极柱1外，第一密封部31与铜铝复合极柱1紧密贴附，由第一密封部31密封包覆复合连接面，由此，实现密封件3对铜铝复 合极柱1的密封作用，并且，由于第一密封部31呈筒状结构，还可以起到对铜铝复合极柱1的限位作用，以及对上注塑件4的支撑的作用，从而保护铜铝复合极柱1的复合连接面在后续的加工、使用过程中不会错位。同时，密封件3包括呈环状的第二密封部32，第二密封部32的下端面与铝基体部12的第一基体部120的上端面紧密贴附，由第二密封部32密封铝基体部12的第一基体部120的上端面。
图5为图3中A-A处的部分剖面图，从图3所示结构的竖直方向剖开，观察方向为A的箭头方向。
在一实施例中，第一密封部31与第二密封部32一体成型，通过此种方式，能够简化密封件3的加工过程，并且方便安装。
在一实施例中，密封件3还包括呈环状的第三密封部33，安装时，由于材料的流动性，可使密封件3在受到压力时向周围排料，直到压缩至需要的压缩量，从而提高了密封件3密封的可靠性。
在一实施例中，本实施例中的动力电池盖通过采用冲压的方式固定铜铝复合极柱1，选择第三柱体部113的上端面作为冲压面，如图2和图5所示，本实施例中的动力电池盖还包括铆接块6，铆接块6设置于上注塑件4上方，第三柱体部113的冲压面一端穿过铆接块6设置，同时，铆接块6设置有连通且同轴分布的第一台阶孔61和第二台阶孔62，第三柱体部113穿过第一台阶孔61设置。
在一实施例中，铆接块6上还设置有沉孔63，沉孔63与第一台阶孔61和第二台阶孔62连通且同轴设置。通过此设置，方便铆接冲头向下冲击铜铝复合极柱1的冲压端，使得第三柱体部113的端部形成有向外凸起的凸出部，凸出部卡设于第一台阶孔61内，从而将铜铝复合极柱1固定，限制铜铝复合极柱1沿自身轴向的移动。
在一实施例中，上注塑件4设有容置槽，铆接块6可置于容置槽内，由此，可以减小动力电池盖的整体厚度，给动力电池的电芯腾出了更大的安装空间，使得动力电池的能量密度得到提升。
在一实施例中，顶盖片2在远离上注塑件4的一侧形成有容纳腔，容纳腔能够容纳铝基体部12，通过此种设置，减小了动力电池盖的整体厚度，继续提升了动力电池的能量密度。
本实施例还提供一种动力电池，包括上述的动力电池盖，其中动力电池盖内铜铝复合极柱1的铝基体部12与动力电池电芯内部的负极集流片连接，铜铝 复合极柱1的铝基体部11与动力电池的外电路连接，由此，在保证电池使用性能的情况下，减轻了动力电池的重量，降低了成本。
本申请实施例公开的动力电池，在保证了动力电池使用性能的情况下，减轻了整体动力电池的重量，降低了成本，同时提高了动力电池使用的可靠性。

Claims (10)

  1. 一种动力电池盖，包括：
    顶盖片(2)；
    铜铝复合极柱(1)，所述铜铝复合极柱(1)穿过所述顶盖片(2)设置，所述铜铝复合极柱(1)包括互相连接的铜基体部(12)和铝基体部(11)，所述铜基体部(12)包括第一基体部(120)和第一柱体部(121)，所述铝基体部(11)包括第二柱体部(112)和第三柱体部(113)，所述第二柱体部(112)与所述第一柱体部(121)直径相等，所述第一柱体部(121)和所述第二柱体部(112)端面连接形成复合连接面；
    密封件(3)，所述密封件(3)夹设于所述铜铝复合极柱(1)与所述顶盖片(2)之间，且所述密封件(3)密封包覆所述复合连接面；
    上注塑件(4)，所述上注塑件(4)设置于所述顶盖片(2)上方，所述铜铝复合极柱(1)穿过上注塑件(4)设置；以及
    下注塑件(5)，所述下注塑件(5)设置于所述顶盖片(2)下方，所述下注塑件(5)夹设于所述顶盖片(2)与所述铜铝复合极柱(1)之间。
  2. 根据权利要求1所述的动力电池盖，其中，所述密封件(3)包括呈筒状的第一密封部(31)，所述第一密封部(31)套设于所述铜铝复合极柱(1)外，所述第一密封部(31)与所述铜铝复合极柱(1)紧密贴附，所述复合连接面由所述第一密封部(31)密封包覆。
  3. 根据权利要求2所述的动力电池盖，其中，所述密封件(3)包括连接于所述第一密封部(31)且呈环状的第二密封部(32)，所述第二密封部(32)的下端面与所述第一基体部(120)的上端面紧密贴附。
  4. 根据权利要求3所述的动力电池盖，其中，所述第一密封部(31)与所述第二密封部(32)一体成型。
  5. 根据权利要求1所述的动力电池盖，其中，所述动力电池盖采用冲压的方式固定所述铜铝复合极柱(1)，冲压面为所述第三柱体部(113)的上端面。
  6. 根据权利要求5所述的动力电池盖，其中，所述动力电池盖包括铆接块(6)，所述铆接块(6)设置于所述上注塑件(4)上方，所述第三柱体部(113)的所述冲压面一端穿过所述铆接块(6)设置。
  7. 根据权利要求6所述的动力电池盖，其中，所述铆接块(6)设置有连通且同轴分布的第一台阶孔(61)和第二台阶孔(62)，所述第三柱体部(113)穿过所述第一台阶孔(61)设置，且所述第三柱体部(113)的端部形成有向外凸起的凸出部，所述凸出部卡设于所述第一台阶孔(61)内。
  8. 根据权利要求7所述的动力电池盖，其中，所述铆接块(6)设置有沉孔(63)，所述沉孔(63)与所述第一台阶孔(61)和所述第二台阶孔(62)连通且同轴设置。
  9. 根据权利要求6所述的动力电池盖，其中，所述上注塑件(4)设有容置槽，所述铆接块(6)置于所述容置槽内。
  10. 一种动力电池，包括如权利要求1～9任一项所述的动力电池盖。
PCT/CN2021/118760 2021-05-14 2021-09-16 动力电池盖及动力电池 WO2022237030A1 (zh)

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