WO2020151709A1 - 电池单元、电池模组及汽车 - Google Patents

电池单元、电池模组及汽车 Download PDF

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Publication number
WO2020151709A1
WO2020151709A1 PCT/CN2020/073533 CN2020073533W WO2020151709A1 WO 2020151709 A1 WO2020151709 A1 WO 2020151709A1 CN 2020073533 W CN2020073533 W CN 2020073533W WO 2020151709 A1 WO2020151709 A1 WO 2020151709A1
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WO
WIPO (PCT)
Prior art keywords
pole
battery unit
tab
area
cover plate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2020/073533
Other languages
English (en)
French (fr)
Inventor
王信月
程晗
朱燕
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BYD Co Ltd
Original Assignee
BYD Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BYD Co Ltd filed Critical BYD Co Ltd
Priority to US17/425,914 priority Critical patent/US11824213B2/en
Priority to EP20746030.4A priority patent/EP3916831A4/en
Priority to JP2021543208A priority patent/JP7257531B2/ja
Priority to KR1020217025662A priority patent/KR102664632B1/ko
Publication of WO2020151709A1 publication Critical patent/WO2020151709A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • 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
    • H01M50/176—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for prismatic or rectangular 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
    • H01M50/147—Lids or covers
    • H01M50/148—Lids or covers characterised by their shape
    • H01M50/15—Lids or covers characterised by their shape for prismatic or rectangular 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
    • H01M50/183—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
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • 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
    • 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
    • H01M50/552—Terminals characterised by their shape
    • H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the invention relates to the field of batteries, in particular to a battery unit, a battery module and an automobile.
  • the battery includes a shell and a pole core set in the shell.
  • the volume of the battery unit determines the volume of the pole core to a certain extent, which is an important determinant of the battery capacity.
  • the installation environment of the battery is basically determined
  • the overall volume of the battery is difficult to increase without restriction, and the capacity of the battery is therefore limited.
  • the object of the present invention is to provide a battery unit to increase the battery capacity in the presence of space constraints.
  • the present invention provides a battery unit, wherein the battery unit includes a housing, a cover plate, a first pole, a second pole and a pole core, the housing has an opening, and the cover plate seals Cover the opening, the pole core is arranged in the housing, the cover plate includes a cover plate body and a concave cavity portion recessed inward relative to the outer surface of the cover plate body, the first pole is accommodated in the In the cavity portion, the first tab of the pole core is electrically connected with the first pole, the second pole is electrically connected with the cover body, and the second tab of the pole core is electrically connected with The cover body is electrically connected.
  • the pole core includes a pole core body having an expansion end, and the expansion end is provided with a pole adapter region and an expansion region protruding from the pole adapter region, and the pole adapter The area is recessed relative to the expansion area to form a pole installation space, the pole passes through the cavity portion and extends toward the pole adapter area, and the pole and the cavity portion are at least partially Is arranged in the pole installation space, the expansion area is aligned with the cover body, and the second pole is arranged on the cover body at a position corresponding to the expansion area.
  • the pole adapter area is surrounded by the expansion area.
  • the cavity portion includes a tubular side wall and an annular bottom wall, and the first pole extends into the tubular side wall and passes through the annular bottom wall.
  • a filler is provided between the first pole and the tubular side wall.
  • the first tab is located in the pole fitting area, and the second tab is located in the expansion area.
  • the first tab is integrally formed with the pole core body, and the second tab is integrally formed with the pole core body.
  • the inner side of the cavity portion is provided with an inner lead piece connected with the first pole, and the first pole is electrically connected to the first tab through the inner lead piece.
  • the present invention provides a battery module, wherein the battery module includes the battery unit described in the above solution.
  • the present invention also provides an automobile, wherein the automobile includes at least one battery module described in the above solutions.
  • the first pole is sinked and contained in the cavity; on the other hand, the second pole is electrically connected to the cover body, which saves insulation construction and can reduce the relative cover of the second pole.
  • the overall height of the board body increases the internal volume of the battery unit, allows the pole core to have a larger volume, and can increase the capacity of the battery unit.
  • Figure 1 is a cross-sectional view of the overall structure of a battery unit in an embodiment of the present invention
  • Fig. 2 is an enlarged view of part A in Fig. 1.
  • Fig. 3 is an enlarged view of part B in Fig. 1.
  • Fig. 4 is a top view of a battery unit in an embodiment of the present invention.
  • Figure 5 is a schematic side view of the pole core structure in an embodiment of the present invention.
  • the present invention provides a battery unit, wherein the battery unit includes a housing 1, a cover plate 2, a first pole 31, a second pole 32, and a pole core 4, the housing 1 has an opening, and the cover plate 2 Cover the opening, the pole core 4 is arranged in the housing 1, and the cover plate 2 includes a cover body 21 and a cavity 22 recessed inward relative to the outer surface of the cover body 21, so The first pole 31 is accommodated in the cavity portion 22, the first pole lug of the pole core 4 is electrically connected to the first pole 31, and the second pole 32 is connected to the cover body 21 is electrically connected, and the second tab of the pole core 4 is electrically connected to the cover body 21.
  • the outer surface of the cover body 21 refers to the surface above the cover body 21 in FIG. 1, that is, the surface of the cover body 21 away from the outer side of the pole core 4 of the battery unit.
  • the cover body 21 is generally flat, so that the outer surface of the cover body 21 is the uppermost surface.
  • the recessed portion is recessed toward the pole core 4 with respect to the uppermost surface of the battery cell.
  • the cover body 21 is generally formed in a flat plate shape, the cavity portion 22 is recessed relative to the cover body 21, and the first pole 31 is accommodated in the cavity portion 22 And can be connected with electrical equipment.
  • the cover body 21 is generally flat, and the first pole 31 passes through the cover body 21 and extends to the outside.
  • the present invention is equivalent to raising the overall height of the cover plate 2. The volume of the cavity formed by the housing 1 and the cover plate 2 is increased, which is convenient for increasing the volume of the pole core 4 and achieving capacity expansion.
  • the first pole 31 sinks and is contained in the cavity portion 22; on the other hand, the second pole 32 is electrically connected to the cover body 21, which saves insulation construction and can reduce the relative distance of the second pole 32.
  • the overall height of the cover body 21 increases the internal volume of the battery unit, allows the pole core 4 to have a larger volume, and can increase the capacity of the battery unit.
  • the second pole 32 is directly electrically connected to the cover body 21.
  • the second pole 32 and the cover body 21 Welding connection can be realized directly, without adding insulating parts (such as ceramic parts) between the two, which can effectively reduce the overall height of the second pole 32, thereby saving the height space in the battery pack, in a limited height space , Set more pole cores 4 to increase the single capacity of the battery unit.
  • the first pole 31 with an insulating member (such as a ceramic member) is sunk and arranged in the cavity portion 22, and the second pole 32 without an insulating member is directly connected to the cover body. 21 is electrically connected, the first pole 31 and the second pole 32 do not occupy the space of the battery cell in the height direction, which effectively improves the space utilization of the battery cell and increases its capacity.
  • the pole core 4 includes a pole core 4 main body having a capacity expansion end 41, and the expansion end 41 is provided with a pole adapter area 42 and is opposite to the pole core 4
  • the expansion area 43 protruding from the adapter area 42, the pole adapter area 42 is recessed relative to the expansion area 43 to form a pole installation space 44, and the first pole 31 passes through the cavity portion 22 And extend toward the pole adapter area 42, the first pole 31 is at least partially disposed in the pole installation space 44, the expansion area 43 is aligned with the cover body 21, as shown in the second
  • the pole 32 is disposed at a position corresponding to the expansion area 43 on the cover body 21.
  • the expansion end 41 is covered by the cover plate 2.
  • the area occupied by the expansion end 41 by the first pole 31 and the cavity portion 22 is the pole adapter area 42, and the area not occupied by the first pole 31 and the cavity portion 22 faces The cover plate 2 protrudes to form an expansion area 43, which increases the volume of the main body of the pole core 4, thereby achieving expansion.
  • the pole adapting region 42 is recessed relative to the expansion region 43 to form a pole mounting space 44, and the first pole 31 is at least partially accommodated in the pole mounting space 44.
  • the cavity portion 22 is at least partially accommodated in the pole mounting space 44.
  • the pole adapter area 42 is surrounded by the expansion area 43.
  • the pole adapter area 42 is arranged between the two expansion regions 43, and the substantially cylindrical cavity portion 22 can be accommodated in the pole installation space 44 between the two expansion regions 43, and the pole is installed
  • the space 44 is formed substantially in a hexahedral shape.
  • the pole mounting space 44 may be formed into a substantially cylindrical shape, that is, the pole adapter region 42 is surrounded by the expansion region 43 to form a recess with a circular cross section. , To accommodate the cylindrical cavity portion 22.
  • the cavity portion 22 includes a tubular side wall and an annular bottom wall, and the first pole 31 extends into the tubular side wall and passes through the annular bottom wall.
  • the cavity portion 22 is formed by a tubular side wall and an annular bottom wall, and the annular bottom wall is provided with a through hole to allow the first pole 31 to pass through.
  • the shape of the cavity portion 22 corresponds to the cylindrical shape of the first pole 31, which can sufficiently reduce the volume occupied by the cavity portion 22.
  • the first pole 31 can also be formed in other shapes, such as a hexagonal prism or a rectangular parallelepiped. Shape etc.
  • a filler is provided between the first pole 31 and the tubular side wall.
  • the first pole 31 and the tubular side wall are separated by a filler, the filler may be made of insulating material, and the filler may have elasticity to buffer the first pole 31 and the tubular side wall .
  • the first tab is located in the pole adapter area 42 and the second tab is located in the expansion area 43.
  • the first tab from the pole adapter area 42 is electrically connected to the first pole 31, and the second tab from the expansion area 43 is electrically connected to the second pole 32; in general, the first tab After the second tabs are drawn out, they all extend upward to the position where the first pole 31 or the second pole 32 is electrically connected, which can effectively save space, reduce costs, and have a simple manufacturing process.
  • first tab and the main body of the pole core 4 are integrally formed, and the second tab and the main body of the pole core 4 are integrally formed.
  • the first tab and the main body of the core 4 are integrally formed with the material made of the core 4, and the second tab and the main body of the core 4 are integrally formed and supported by the material made of the core 4;
  • the first tab can be a positive electrode Or negative electrode, the second tab is the other of the positive electrode or the negative electrode.
  • the first pole 31 is connected to the first pole ear.
  • the first pole 31 and the first pole lug may be directly connected, or may be connected through other structures.
  • the inner side of the cavity portion 22 is provided with an inner lead-out piece 5 connected to the first pole 31, and the first pole 31 is electrically connected to the first lead-ear through the inner lead-out piece 5 connection.
  • the inner side of the cavity portion 22 is the side facing the pole core 4.
  • the cavity portion 22 is provided in the pole adapter area 42, and the inner lead sheet 5 can be attached to the side of the cavity portion 22.
  • the first pole 31 is connected to the inner lead-out piece 5, and is electrically connected to the first pole lug located in the pole-fitting area 42 through the inner lead-out piece 5.
  • the present invention also provides a battery module, wherein the battery module includes the battery unit described in the above solution.
  • the battery module may include a plurality of the battery cells, and the plurality of battery cells are connected in series or in parallel to supply power.
  • the present invention also provides an automobile, wherein the automobile includes at least one battery module described in the above solutions.
  • first and second are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined with “first” and “second” may explicitly or implicitly include one or more of these features. In the description of the present invention, “plurality” means two or more, unless otherwise specifically defined.
  • the terms “installed”, “connected”, “connected”, “fixed” and other terms should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection , Or integrated; it can be a mechanical connection, or it can be an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal communication of two components or the interaction relationship between two components.
  • installed may be a fixed connection or a detachable connection , Or integrated; it can be a mechanical connection, or it can be an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal communication of two components or the interaction relationship between two components.
  • the "on” or “under” of the first feature on the second feature may be in direct contact with the first and second features, or the first and second features may be indirectly through an intermediary. contact.
  • the "above”, “above” and “above” of the first feature on the second feature may mean that the first feature is directly above or obliquely above the second feature, or it simply means that the level of the first feature is higher than the second feature.
  • the “below”, “below” and “below” of the second feature of the first feature may mean that the first feature is directly below or obliquely below the second feature, or it simply means that the level of the first feature is smaller than the second feature.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Battery Electrode And Active Subsutance (AREA)
  • Secondary Cells (AREA)

Abstract

一种电池单元、电池模组和汽车，其中，所述电池单元包括外壳(1)、盖板(2)、第一极柱(31)、第二极柱(32)和极芯(4)，所述外壳(1)具有开口，所述盖板(2)封盖所述开口，所述极芯(4)设置在所述外壳(1)内，所述盖板(2)包括盖板本体(21)以及相对所述盖板本体(21)的外表面向内凹陷的凹腔部(22)，所述第一极柱(31)容纳在所述凹腔部(22)中，所述极芯(4)的第一极耳与所述第一极柱(31)电连接，所述第二极柱(32)与所述盖板本体(21)电连接，所述极芯(4)的第二极耳与所述盖板本体(21)电连接。

Description

电池单元、电池模组及汽车
相关申请的交叉引用
本申请要求比亚迪股份有限公司于2019年1月26日提交的、发明名称为“电池单元、电池模组及汽车”的、中国专利申请号“201910076293.4”的优先权。
技术领域
本发明涉及电池领域，具体地涉及一种电池单元、电池模组及汽车。
背景技术
随着科技的发展，各种电子设备、电动工具等得到广泛应用，例如手机、电动车辆等，作为核心部件，电池的性能对整体的性能及使用体验具有重要影响，特别地，电池的容量决定了整体的续航，也是使用者的重要关注点。
电池包括外壳和设置在外壳中的极芯，电池单元的体积从一定程度上决定了极芯的体积，是电池容量的重要决定因素，在电子设备、电动工具中，电池所在的安装环境基本决定了电池所占用的空间大小，电池的整体体积难以不受限制地增加，电池的容量因此也受到限制。
发明内容
本发明的目的是提供一种电池单元，以在存在空间限制的情况下增加电池容量。
为了实现上述目的，本发明提供了一种电池单元，其中，所述电池单元包括外壳、盖板、第一极柱、第二极柱和极芯，所述外壳具有开口，所述盖板封盖所述开口，所述极芯设置在所述外壳内，所述盖板包括盖板本体以及相对所述盖板本体的外表面向内凹陷的凹腔部，所述第一极柱容纳在所述凹腔部中，所述极芯的第一极耳与所述第一极柱电连接，所述第二极柱与所述盖板本体电连接，所述极芯的第二极耳与所述盖板本体电连接。
一些实施例中，所述极芯包括具有扩容端的极芯主体，所述扩容端设置有极柱适配区和相对于所述极柱适配区凸出的扩容区，所述极柱适配区相对于所述扩容区凹陷而形成极柱安装空间，所述极柱穿过所述凹腔部并朝向所述极柱适配区延伸，所述极柱和所述凹腔部至少部分地设置在所述极柱安装空间中，所述扩容区对齐所述盖板本体，所述第二极柱设置在所述盖板本体上与所述扩容区对应的位置。
一些实施例中，所述极柱适配区通过所述扩容区环绕。
一些实施例中，所述凹腔部包括管状侧壁和环形底壁，所述第一极柱伸入所述管状侧壁 并穿过所述环形底壁。
一些实施例中，所述第一极柱和所述管状侧壁之间设置有填充物。
一些实施例中，所述第一极耳位于所述极柱适配区，所述第二极耳位于所述扩容区。
一些实施例中，所述第一极耳与所述极芯主体一体成型，所述第二极耳与所述极芯主体一体成型。
一些实施例中，所述凹腔部的内侧设置有与所述第一极柱连接的内引出片，所述第一极柱通过所述内引出片与所述第一极耳电连接。
另外，本发明提供了一种电池模组，其中，所述电池模组包括以上方案所述的电池单元。
另外，本发明还提供了一种汽车，其中，所述汽车包括至少一个以上方案所述的电池模组。
通过上述技术方案，一方面，第一极柱内沉并容纳在凹腔部内；另一方面，第二极柱电连接在盖板本体上，节省了绝缘构建，可以降低第二极柱相对盖板本体的整体高度；增加了电池单元的内部容积，允许极芯具有更大的体积，可以增加电池单元的容量。
本发明的附加方面和优点将在下面的描述中部分给出，部分将从下面的描述中变得明显，或通过本发明的实践了解到。
附图说明
图1是本发明一个实施例中，电池单元的整体结构剖视图；
图2是图1中A部分的放大图。
图3是图1中B部分的放大图。
图4是本发明一个实施例中，电池单元的俯视图。
图5是本发明一个实施例中，极芯的结构侧面示意图
附图标记说明
外壳 1；盖板 2；盖板本体 21；凹腔部 22；第一极柱 31；第二极柱 32；极芯 4；扩容端 41；极柱适配区 42；扩容区 43；极柱安装空间 44；内引出片 5。
具体实施方式
下面详细描述本发明的实施例，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。下面通过参考附图描述的实施例是示例性的，旨在用于解释本发明，而不能理解为对本发明的限制。
本发明提供了一种电池单元，其中，所述电池单元包括外壳1、盖板2、第一极柱31、第二极柱32和极芯4，所述外壳1具有开口，所述盖板2封盖所述开口，所述极 芯4设置在所述外壳1内，所述盖板2包括盖板本体21以及相对所述盖板本体21的外表面向内凹陷的凹腔部22，所述第一极柱31容纳在所述凹腔部22中，所述极芯4的第一极耳与所述第一极柱31电连接，所述第二极柱32与所述盖板本体21电连接，所述极芯4的第二极耳与所述盖板本体21电连接。
其中，盖板本体21的外表面指的是图1中的盖板本体21上方的表面，即盖板本体21远离该电池单元的极芯4的外侧的表面。在一些实施例中，盖板本体21一般采用的是平板状，如此，盖板本体21的外表面则是其最上方的表面。凹陷部则相对于电池单元的最上侧表面向极芯4凹陷。
如图1、图2、图3、图4和图5所示，盖板本体21大致形成为平板状，凹腔部22相对盖板本体21凹陷，第一极柱31容纳在凹腔部22中并可以与用电设备连接。在现有技术中，盖板本体21整体大致为平板状，第一极柱31穿过盖板本体21而延伸到外部，与之相比，本发明相当于提升了盖板2的整体高度，使得外壳1与盖板2组成的腔体的体积增加，便于增加所述极芯4的体积，实现扩容。一方面，第一极柱31内沉并容纳在凹腔部22内；另一方面，第二极柱32电连接在盖板本体21上，节省了绝缘构建，可以降低第二极柱32相对盖板本体21的整体高度；增加了电池单元的内部容积，允许极芯4具有更大的体积，可以增加电池单元的容量。
在本发明的一个实施例中，如图3和图4所示，第二极柱32直接与盖板本体21电连接，如此，在具体实施过程中，第二极柱32与盖板本体21可以直接实现焊接连接，而不需在两者之间添加绝缘件(比如陶瓷件)，可以有效降低第二极柱32的整体高度，从而节省电池包体内的高度空间，在有限的高度空间内，设置更多的极芯4，提高电池单元的单体容量。
在本发明的一个实施例中，带有绝缘件(比如陶瓷件)的第一极柱31内沉并设置在凹腔部22中，不带绝缘件的第二极柱32直接与盖板本体21电连接，第一极柱31和第二极柱32都不占用电池单元在高度方向上的空间，有效提高电池单元的空间利用率，提高其容量。
一些实施例中，如图1和图2所示，所述极芯4包括具有扩容端41的极芯4主体，所述扩容端41设置有极柱适配区42和相对于所述极柱适配区42凸出的扩容区43，所述极柱适配区42相对于所述扩容区43凹陷而形成极柱安装空间44，所述第一极柱31穿过所述凹腔部22并朝向所述极柱适配区42延伸，所述第一极柱31至少部分地设置在所述极柱安装空间44中，所述扩容区43对齐所述盖板本体21，所示第二极柱32设置在所述盖板本体21上与所述扩容区43对应的位置。
扩容端41通过盖板2覆盖，扩容端41被第一极柱31和凹腔部22占用的区域为极 柱适配区42，未被第一极柱31和凹腔部22占用的区域朝向盖板2凸出而形成扩容区43，增加了极芯4主体的体积，从而实现了扩容。极柱适配区42相对于扩容区43凹陷形成极柱安装空间44，第一极柱31至少部分地容纳在该极柱安装空间44中。
另外，凹腔部22至少部分地容纳在该极柱安装空间44中。
所述极柱适配区42通过所述扩容区43环绕。极柱适配区42设置在两个扩容区43之间，大致呈圆柱状的凹腔部22可以容纳在两个扩容区43之间的所述极柱安装空间44中，所述极柱安装空间44大致形成为六面体形状。为了一些实施例中增加极芯4主体的体积，可以形成为大致呈圆柱形的所述极柱安装空间44，即极柱适配区42通过扩容区43环绕，围成截面为圆形的凹陷，以容纳圆柱形的凹腔部22。
一些实施例中，所述凹腔部22包括管状侧壁和环形底壁，所述第一极柱31伸入所述管状侧壁并穿过所述环形底壁。如图2所示，凹腔部22通过管状侧壁和环形底壁共同形成，环形底壁设置有通孔以允许第一极柱31穿过。凹腔部22的形状与第一极柱31的圆柱形形状对应，可以充分地减小凹腔部22所占体积，当然第一极柱31也可以形成为其他形状，例如，六棱柱、长方体形状等。
一些实施例中，所述第一极柱31和所述管状侧壁之间设置有填充物。第一极柱31与所述管状侧壁通过填充物间隔，所述填充物可以为绝缘材料制成，并且所述填充物可以具有弹性，对第一极柱31与所述管状侧壁进行缓冲。
本发明的一个实施例中，第一极耳位于极柱适配区42，第二极耳位于扩容区43。由极柱适配区42引出的第一极耳与第一极柱31电连接，而由扩容区43引出的第二极耳与第二极柱32电连接；一般情况下，第一极耳、第二极耳引出后，均向上延伸至于第一极柱31或第二极柱32电连接的位置，能够有效节省空间、降低成本，并且制作工艺简单。
一些实施例中，所述第一极耳与所述极芯4主体一体成型，第二极耳与所述极芯4主体一体成型。第一极耳和极芯4主体由制成极芯4的材料一体成型制成，第二极耳和极芯4主体由制成极芯4的材料一体成型支撑；第一极耳可以为正极或负极，第二极耳为正极或负极中的另一个。
如上所述，所述第一极柱31连接于所述第一极耳。第一极柱31与第一极耳可以直接连接，也可以通过其他结构而连接。
一些实施例中，所述凹腔部22的内侧设置有与所述第一极柱31连接的内引出片5，所述第一极柱31通过所述内引出片5与第一极耳电连接。
如图2所示，凹腔部22的内侧为朝向所述极芯4的一侧，凹腔部22设置在极柱适配区42中，内引出片5可以贴合在凹腔部22的环形底壁上，第一极柱31连接于内引 出片5，并通过内引出片5与位于极柱适配区42的第一极耳电连接。
另外，本发明还提供了一种电池模组，其中，所述电池模组包括以上方案所述的电池单元。所述电池模组可以包括多个所述电池单元，多个电池单元以串联或并联方式连接而供电。
另外，本发明还提供了一种汽车，其中，所述汽车包括至少一个以上方案所述的电池模组。
在本发明的描述中，需要理解的是，术语“中心”、“纵向”、“横向”、“长度”、“宽度”、“厚度”、“上”、“下”、“前”、“后”、“左”、“右”、“竖直”、“水平”、“顶”、“底”“内”、“外”、“顺时针”、“逆时针”、“轴向”、“径向”、“周向”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发明和简化描述，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发明的限制。
此外，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示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一个或者更多个该特征。在本发明的描述中，“多个”的含义是两个以上，除非另有明确具体的限定。
在本发明中，除非另有明确的规定和限定，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；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。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发明中的具体含义。
在本发明中，除非另有明确的规定和限定，第一特征在第二特征“上”或“下”可以是第一和第二特征直接接触，或第一和第二特征通过中间媒介间接接触。而且，第一特征在第二特征“之上”、“上方”和“上面”可是第一特征在第二特征正上方或斜上方，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”可以是第一特征在第二特征正下方或斜下方，或仅仅表示第一特征水平高度小于第二特征。
在本说明书的描述中，参考术语“一个实施例”、“一些实施例”、“示例”、“具体示例”、或“一些示例”等的描述意指结合该实施例或示例描述的具体特征、结构、材料或者特点包含于本发明的至少一个实施例或示例中。在本说明书中，对上述术语的示意性表述不必须针对的是相同的实施例或示例。而且，描述的具体特征、结构、材料或者特点可以在任一个或多个实施例或示例中以合适的方式结合。此外，在不相互矛盾的情况下，本领域的 技术人员可以将本说明书中描述的不同实施例或示例以及不同实施例或示例的特征进行结合和组合。
尽管上面已经示出和描述了本发明的实施例，可以理解的是，上述实施例是示例性的，不能理解为对本发明的限制，本领域的普通技术人员在本发明的范围内可以对上述实施例进行变化、修改、替换和变型。

Claims (10)

  1. 一种电池单元，其特征在于，所述电池单元包括外壳、盖板、第一极柱、第二极柱和极芯，所述外壳具有开口，所述盖板封盖所述开口，所述极芯设置在所述外壳内，所述盖板包括盖板本体以及相对所述盖板本体的外表面向内凹陷的凹腔部，所述第一极柱容纳在所述凹腔部中，所述极芯的第一极耳与所述第一极柱电连接，所述第二极柱与所述盖板本体电连接，所述极芯的第二极耳与所述盖板本体电连接。
  2. 根据权利要求1所述的电池单元，其特征在于，所述极芯包括具有扩容端的极芯主体，所述扩容端设置有极柱适配区和相对于所述极柱适配区凸出的扩容区，所述极柱适配区相对于所述扩容区凹陷而形成极柱安装空间，所述第一极柱穿过所述凹腔部并朝向所述极柱适配区延伸，所述第一极柱至少部分地设置在所述极柱安装空间中，所述扩容区对齐所述盖板本体，所述第二极柱设置在所述盖板本体上与所述扩容区对应的位置。
  3. 根据权利要求2所述的电池单元，其特征在于，所述极柱适配区通过所述扩容区环绕。
  4. 根据权利要求3所述的电池单元，其特征在于，所述凹腔部包括管状侧壁和环形底壁，所述第一极柱伸入所述管状侧壁并穿过所述环形底壁。
  5. 根据权利要求4所述的电池单元，其特征在于，所述第一极柱和所述管状侧壁之间设置有填充物。
  6. 根据权利要求2-5中任一项所述的电池单元，其特征在于，所述第一极耳位于所述极柱适配区，所述第二极耳位于所述扩容区。
  7. 根据权利要求2-6中任一项所述的电池单元，其特征在于，所述第一极耳与所述极芯主体一体成型，所述第二极耳与所述极芯主体一体成型。
  8. 根据权利要求1-7中任一项所述的电池单元，其特征在于，所述凹腔部的内侧设置有与所述第一极柱连接的内引出片，所述第一极柱通过所述内引出片与所述第一极耳电连接。
  9. 一种电池模组，其特征在于，所述电池模组包括权利要求1-8中任意一项所述的电池单元。
  10. 一种汽车，其特征在于，所述汽车包括至少一个权利要求9所述的电池模组。
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EP3916831A1 (en) 2021-12-01

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