WO2022151837A1 - 电池 - Google Patents

电池 Download PDF

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Publication number
WO2022151837A1
WO2022151837A1 PCT/CN2021/132103 CN2021132103W WO2022151837A1 WO 2022151837 A1 WO2022151837 A1 WO 2022151837A1 CN 2021132103 W CN2021132103 W CN 2021132103W WO 2022151837 A1 WO2022151837 A1 WO 2022151837A1
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WO
WIPO (PCT)
Prior art keywords
casing
limiting portion
battery
insulating member
cover group
Prior art date
Application number
PCT/CN2021/132103
Other languages
English (en)
French (fr)
Inventor
刘亮亮
祝媛
***
刘金成
Original Assignee
惠州亿纬锂能股份有限公司
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 惠州亿纬锂能股份有限公司 filed Critical 惠州亿纬锂能股份有限公司
Priority to JP2023531491A priority Critical patent/JP7487420B2/ja
Priority to KR1020237018966A priority patent/KR20230104244A/ko
Publication of WO2022151837A1 publication Critical patent/WO2022151837A1/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
    • 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
    • H01M50/183—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
    • H01M50/60—Arrangements or processes for filling or topping-up with liquids; Arrangements or processes for draining liquids from casings
    • H01M50/609—Arrangements or processes for filling with liquid, e.g. electrolytes
    • H01M50/627—Filling ports
    • H01M50/636—Closing or sealing filling ports, e.g. using lids
    • H01M50/645—Plugs
    • 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 field of battery technology, for example, to a miniature battery.
  • Pin-type miniature lithium-ion batteries are usually sealed by side extrusion.
  • This sealing method has the following defects: 1. Side extrusion is generally realized by rolling grooves, and the lithium-ion batteries sealed by rolling grooves occupy the diameter direction. The space of the battery is large, which leads to the reduction of the internal capacity of the battery, so that the diameter of the battery is limited. Generally, it can only achieve a diameter of about 3.6mm; 2. There is no liquid injection hole, and the liquid injection is generally used, which is difficult to operate. , and cannot be automated; 3. When sealing and welding, small-diameter batteries easily affect the stability of the central sealant layer, and welding is difficult.
  • the present application provides a battery with a small diameter, convenient sealing, larger capacity and high energy density under the same volume.
  • An embodiment provides a battery, including a case with an accommodating cavity in the case; a battery cell installed in the accommodating cavity; a first cover group, the first cover group including a first cover group a body, and an electrode connector disposed on the first body and connected to the first body in an insulating manner, the first body is configured to be inserted into the casing and the sidewall of the first body is connected to the the side wall of the casing is welded; and a second cover set, the second cover set includes a second body, the second body is arranged to be inserted into the casing and the side wall of the second body is connected with the casing The side walls of the body are welded; wherein, two ends of the casing are respectively provided with openings, one of the openings is blocked by the first cover group, and the other opening is blocked by the second cover group;
  • the battery core is provided with two tabs, one of which is connected to the electrode connecting piece, and the other tab is connected to the second body.
  • FIG. 1 is a schematic cross-sectional view of a battery according to an embodiment of the present application.
  • FIG. 2 is an exploded schematic diagram of a battery according to an embodiment of the present application.
  • FIG 3 is a schematic cross-sectional view of a first cover group according to an embodiment of the present application.
  • FIG. 4 is an exploded schematic view of the first cover group according to an embodiment of the present application.
  • FIG. 5 is a schematic cross-sectional view of a second cover group according to an embodiment of the present application.
  • FIG. 6 is a schematic diagram of the assembly of the first cover group and the battery cell according to an embodiment of the present application.
  • FIG. 7 is a schematic view of the assembly of the first cover group, the cell and the casing according to an embodiment of the application.
  • FIG. 8 is a welding state diagram of the second body of the second cover group and the negative electrode ear of the battery cell according to an embodiment of the application.
  • FIG. 9 is a schematic structural diagram of an assembled second body and a casing according to an embodiment of the present application.
  • connection should be understood in a broad sense, for example, it may be a fixed connection, a detachable connection, or an integrated ; It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between the two elements.
  • connection may be a fixed connection, a detachable connection, or an integrated ; It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between the two elements.
  • a first feature "on” or “under” a second feature may include direct contact between the first and second features, or may include the first and second features Not directly but through additional features between them.
  • the first feature being “above”, “over” and “above” the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is level higher than the second feature.
  • the first feature is “below”, “below” and “below” the second feature includes the first feature being directly below and diagonally below the second feature, or simply means that the first feature has a lower level than the second feature.
  • the battery according to the embodiment of the present application includes a casing 1 and a battery cell 2 .
  • the casing 1 has an accommodation cavity 11 inside, and the electric core 2 is installed in the accommodation cavity 11 .
  • Both ends of the housing 1 are respectively provided with openings, one of the openings is blocked by the first cover group 3, and the other is blocked by the second cover group 4, and the first cover group 3 includes a first cover group 3.
  • the body 31 , the electrode connector 32 is insulated and connected to the first body 31 , the first body 31 is inserted into the casing 1 , and the side wall of the first body 31 is connected to the side of the casing 1 .
  • the second cover set 4 includes a second body 41 , the second body 41 is inserted into the casing 1 and the side wall of the second body 41 is welded with the side wall of the casing 1 , one of the tabs of the battery core 2 is connected to the electrode connector 32 , and the other tab is connected to the second body 41 .
  • the first body 31 and the second body 41 are respectively connected to the side wall of the casing 1 by welding, and welding can be applied from the outer side wall of the casing 1 during welding, which effectively reduces the difficulty of welding and improves the sealing effect. It does not occupy the space in the diameter direction of the battery. Under the same battery size, the space in the casing 1 of the battery of the present application is the largest, and the energy density is also high.
  • the openings of the casing 1 are provided at both ends of the casing 1 in the height direction.
  • the casing 1 is cylindrical, and the height to diameter ratio is greater than 2:1, for example: 3:1, 4:1, 5:1, 6:1, 7:1, 8:1, 9 :1 or 10:1 etc.
  • the diameter of the housing 1 is less than 5 mm. In other embodiments, the diameter of the housing 1 is 3 mm.
  • the battery cell 2 includes a positive electrode lug 21 and a negative electrode lug 22 , the positive electrode lug 21 is welded with the electrode connector 32 on the first cover group 3 , and the negative electrode lug 22 is welded with the second body 41 of the second cover group 4 .
  • the specific welding method may be laser welding or resistance welding.
  • the welding positions of the positive tab 21 and the negative tab 22 of the battery cell 2 can also be interchanged, that is, the negative tab 22 is welded to the electrode connector 32 , and the positive tab 21 is welded to the second body 41 .
  • insulating pads are respectively provided on the upper and lower end faces of the cell 2, wherein the insulating pad on the upper end of the cell 2 is located in the cell 2 and connected to the electrodes Between the components 32 , the insulating pad at the lower end of the cell 2 is located between the cell 2 and the second body 41 .
  • the battery core 2 is a wound battery core, and the axis of the wound battery core is parallel or coincident with the central axis of the casing 1 .
  • the cell 2 may also be a laminated cell.
  • a liquid injection hole 411 is formed through the second body 41 , and the liquid injection hole 411 is blocked by a blocking member.
  • the blocking member is a blocking plate 42 , and the blocking plate 42 is welded or bonded to a side surface of the second body 41 away from the interior of the housing 1 .
  • the plate-shaped blocking member can reduce the size of the battery in the height direction, has low manufacturing difficulty, and is convenient for blocking.
  • a circle of first limiting members 312 is annularly disposed on the side wall of the first body 31 , and the first limiting member 312 is close to a side of the housing 1 .
  • the side surface is in contact with the end surface of the casing 1 .
  • a second stopper 412 is annularly disposed on the side wall of the second body 41 , and the second stopper 412 is close to the surface of the housing 1 .
  • One side surface is in contact with the end surface of the housing 1 .
  • the electrode connecting member 32 includes a connecting portion 321 and a first limiting portion 322 , the first limiting portion 322 is fixed on one end of the connecting portion 321 , and the first limiting portion 322 is A mounting hole 311 is formed through a main body 31 , the first main body 31 has a first side surface and a second side surface arranged opposite to each other, the first side surface faces the inside of the housing 1 , and the second side surface faces the Outside the casing 1, the first limiting portion 322 is disposed on the first side surface, and the end of the connecting portion 321 away from the first limiting portion 322 extends through the mounting hole 311 to the first side.
  • a first insulating member 33 is disposed between the connecting portion 321 and the hole wall of the mounting hole 311
  • a second insulating member 34 is disposed between the first limiting portion 322 and the first body 31 .
  • a second limiting portion 36 is provided at one end of the connecting portion 321 away from the first limiting portion 322 , and the second limiting portion 36 and the first limiting portion 322 are respectively provided at On both sides of the first body 31 , a third insulating member 35 is disposed between the second limiting portion 36 and the first body 31 .
  • the connecting portion 321 is riveted to the second limiting portion 36 .
  • the first insulating member 33 , the second insulating member 34 and the third insulating member 35 are integrally injection-molded with plastic.
  • the three insulating parts that are integrally injection molded can effectively reduce the difficulty of assembly, and at the same time can ensure the reliability of sealing and insulation, so that the first cover group 3 is assembled to form an integral structure, which facilitates the assembly of the first cover group 3 and the housing 1 .
  • the overall structure composed of the first insulating member 33 , the second insulating member 34 and the third insulating member 35 adopts polyethylene (Polyethylene, PE), polypropylene (Polypropylene, PP) and polytetrafluoroethylene (Polytetrafluoroethylene, PFA), polybutylene terephthalate (Polybutylene terephathalate, PBT), polyphenylene sulfide (Polyphenylene sulphide, PPS) and other electrical insulating plastics made of any material.
  • PE is a thermoplastic resin obtained by the polymerization of ethylene.
  • copolymers of ethylene with small amounts of alpha-olefins are also included.
  • Polyethylene is odorless, non-toxic, feels like wax, has excellent low temperature resistance (minimum operating temperature can reach -100 ° C to -70 ° C), good chemical stability, and can withstand most acid and alkali erosion. It is insoluble in common solvents at room temperature, with low water absorption and excellent electrical insulation.
  • PP is a polymer formed by polyaddition of propylene. It is a white waxy material with a transparent and light appearance. It is flammable. It has a melting point of 165 °C and softens at about 155 °C.
  • PFA also known as perfluoroalkylate, soluble polytetrafluoroethylene
  • PFA is a copolymer of a small amount of perfluoropropyl perfluorovinyl ether and polytetrafluoroethylene.
  • the melt adhesion is enhanced, the melt viscosity is reduced, and the performance is unchanged compared with PTFE.
  • This resin can be directly processed into products by ordinary thermoplastic molding methods.
  • PFA is used for a long time in the environment of temperature -200 °C to 260 °C, has excellent chemical corrosion resistance, corrosion resistance to all chemicals, the lowest friction coefficient among plastics, and good electrical properties, its electrical insulation Unaffected by temperature, it is known as the "Plastic King".
  • the chemical resistance of PFA is similar to that of PTFE, better than that of vinylidene fluoride, its creep resistance and compressive strength are better than those of PTFE, its tensile strength is higher, and its elongation can reach 100-300%; its dielectric properties Good, excellent radiation resistance; high flame retardancy; non-toxic, physiologically inert, and can be implanted into the human body.
  • the battery assembly process is as follows:
  • the electrode connecting member 32 , the first body 31 and the second limiting portion 36 are assembled so that the connecting portion 321 of the electrode connecting member 32 is away from one end of the first limiting portion 322 and the second limiting portion 32 .
  • the position portion 36 is riveted, an insulating member is formed by injection molding between the electrode connecting member 32 and the first body 31, and an insulating member is formed by injection molding between the second limiting portion 36 and the first body 31, so that the electrode connecting member 32 and the first body 31 are formed by injection molding.
  • a main body 31 and the second limiting portion 36 are assembled into an integral first cover set 3;
  • the battery cell 2 is wound to weld the positive electrode lug 21 of the battery cell 2 and the first limiting portion 322 (ie, the electrode connector 32) of the first cover group 3;
  • the second body 41 is assembled in the opening of the other end of the casing 1, and welding is applied from the outer wall of the casing 1, so that the second body 41 and the casing 1 are welded and fixed;
  • the blocking plate 42 is welded on the second body 41 to block the liquid injection hole 411 .

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Cell Separators (AREA)
  • Filling, Topping-Up Batteries (AREA)

Abstract

一种电池，包括壳体，所述壳体内具有容纳腔；电芯，所述电芯安装于所述容纳腔内；第一盖组，所述第一盖组包括第一本体，及设置于所述第一本体上且与所述第一本体绝缘连接的电极连接件，所述第一本体设置为***到所述壳体内且所述第一本体的侧壁与所述壳体的侧壁焊接；及第二盖组，所述第二盖组包括第二本体，所述第二本体设置为***到所述壳体内且所述第二本体的侧壁与所述壳体的侧壁焊接；其中，所述壳体的两端分别设置有开口，其中一个所述开口通过所述第一盖组封堵，另一个所述开口通过所述第二盖组封堵；所述电芯设有两个极耳，其中一极耳与所述电极连接件连接，另一极耳与所述第二本体连接。

Description

电池
本申请要求申请日为2021年1月13日、申请号为202120092674.4的中国专利申请的优先权，该申请的全部内容通过引用结合在本申请中。
技术领域
本申请涉及电池技术领域，例如涉及一种微型的电池。
背景技术
针式微型锂离子电池通常采用侧边挤压的方式封口，此封口方式存在以下缺陷：1、侧边挤压一般是采用滚槽的方式实现，滚槽封口密封的锂离子电池在直径方向占用的空间较大，导致电池的内部容量降低，使得电池直径微小化存在局限性，一般只能做到直径3.6mm左右；2、无注液孔，一般都是采用滴液式注液，操作困难，且无法实现自动化；3、封口焊接时，小直径电池容易影响中心密封胶层的稳定性，焊接难度较大。
发明内容
本申请提供了一种电池，该电池直径小，密封方便，同等体积下容量更大，能量密度大。
一实施例提供了一种电池，包括壳体，所述壳体内具有容纳腔；电芯，所述电芯安装于所述容纳腔内；第一盖组，所述第一盖组包括第一本体，及设置于所述第一本体上且与所述第一本体绝缘连接的电极连接件，所述第一本体设置为***到所述壳体内且所述第一本体的侧壁与所述壳体的侧壁焊接；及第二盖组，所述第二盖组包括第二本体，所述第二本体设置为***到所述壳体内且所述第二本体的侧壁与所述壳体的侧壁焊接；其中，所述壳体的两端分别设置有开口，其中一个所述开口通过所述第一盖组封堵，另一个所述开口通过所述第二盖组封堵；所述电芯设有两个极耳，其中一极耳与所述电极连接件连接，另一极耳与所述第二本体连接。
附图说明
图1为本申请一实施例的电池的剖视示意图。
图2为本申请一实施例的电池的分解示意图。
图3为本申请一实施例的第一盖组的剖视示意图。
图4为本申请一实施例的第一盖组的分解示意图。
图5为本申请一实施例的第二盖组的剖视示意图。
图6为本申请一实施例的第一盖组和电芯的组装示意图。
图7为本申请一实施例的第一盖组、电芯和壳体的组装示意图。
图8为本申请一实施例的第二盖组的第二本体与电芯的负极耳的焊接状态图。
图9为本申请一实施例的第二本体与壳体组装后的结构示意图。
图中：
1、壳体；11、容纳腔；2、电芯；21、正极耳；22、负极耳；3、第一盖组；31、第一本体；311、安装孔；312、第一限位件；32、电极连接件；321、连接部；322、第一限位部；33、第一绝缘件；34、第二绝缘件；35、第三绝缘件；36、第二限位部；4、第二盖组；41、第二本体；411、注液孔；412、第二限位件；42、封堵板。
具体实施方式
在本申请的描述中，除非另有明确的规定和限定，术语“相连”、“连接”、“固定”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，可以具体情况理解上述术语在本申请中的具体含义。
在本申请中，除非另有明确的规定和限定，第一特征在第二特征之“上”或之“下”可以包括第一和第二特征直接接触，也可以包括第一和第二特征不是直接接触而是通过它们之间的另外的特征接触。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。
如图1至图4所示，本申请实施例的电池包括壳体1和电芯2，所述壳体1内具 有容纳腔11，所述电芯2安装于所述容纳腔11内，所述壳体1的两端分别设置有开口，其中一个所述开口通过第一盖组3封堵，另一个所述开口通过第二盖组4封堵，所述第一盖组3包括第一本体31，所述第一本体31上绝缘连接有电极连接件32，所述第一本体31***到所述壳体1内且所述第一本体31的侧壁与所述壳体1的侧壁焊接，所述第二盖组4包括第二本体41，所述第二本体41***到所述壳体1内且所述第二本体41的侧壁与所述壳体1的侧壁焊接，所述电芯2其中一极耳与所述电极连接件32连接，另一极耳与所述第二本体41连接。通过焊接的方式使第一本体31、第二本体41分别与壳体1的侧壁连接，焊接时可以从壳体1的外侧壁施焊，有效地降低了焊接难度，提升了密封效果，且不会占用电池直径方向的空间，在同等电池尺寸下，本申请的电池的壳体1内的空间最大，能量密度也大。
在本实施例中，壳体1的开口设置在壳体1的高度方向的两端。
在一实施例中，壳体1呈圆柱形，高度与直径比为大于2：1，例如：3：1，4：1，5：1，6：1，7：1，8：1，9:1或10:1等。在一实施例中，壳体1的直径小于5mm。在其他实施例中，壳体1的直径为3mm。
所述电芯2包括正极耳21和负极耳22，正极耳21与第一盖组3上的电极连接件32焊接，而负极耳22与第二盖组4的第二本体41焊接。具体的焊接方式可以为激光焊接或者电阻焊。在其他实施例中，还可以将电芯2的正极耳21和负极耳22的焊接位置互换，即负极耳22与电极连接件32焊接，正极耳21与第二本体41焊接。
另外，为了使电芯2与壳体1绝缘，电芯2的上端面和下端面分别设置绝缘垫(图上未示出)，其中，电芯2上端的绝缘垫位于电芯2与电极连接件32之间，电芯2下端的绝缘垫位于电芯2与第二本体41之间。
在本实施例中，电芯2为卷绕式电芯，卷绕式电芯的轴线与壳体1的中心轴线平行或重合。在其他实施例中，电芯2还可以为叠片式电芯。
一实施例中，如图5所示，所述第二本体41上贯穿开设注液孔411，所述注液孔411通过封堵件封堵。通过在第二本体41上设置注液孔411，可以使小直径的电池能够实现自动化注液，有效地降低注液难度，提升注液速度。
在本实施例中，所述封堵件为封堵板42，所述封堵板42焊接或粘接在所述第二本体41远离所述壳体1内部的一侧面。板状的封堵件能够减少电池高度方向的尺寸，且制造难度低，封堵比较方便。
一实施例中，如图1和图3所示，所述第一本体31的侧壁环形设置一圈第一限位件312，所述第一限位件312靠近所述壳体1的一侧面与所述壳体1的端面抵接。通过设置第一限位件312，可以在第一盖组3与壳体1装配时，对第一盖组3的位置进行限定，保证第一盖组3内陷于壳体1内部的部分的位置能够准确。
在一实施例中，如图1和图5所示，所述第二本体41的侧壁环形设置一圈第二限位件412，所述第二限位件412靠近所述壳体1的一侧面与所述壳体1的端面抵接。通过设置第二限位件412，可以在第二盖组4与壳体1装配时，对第二盖组4的位置进行限定，保证第二盖组4内陷于壳体1内部的部分的位置能够准确。
一实施例中，如图3所示，所述电极连接件32包括连接部321和第一限位部322，所述第一限位部322固定在所述连接部321的一端，所述第一本体31上贯穿开设安装孔311，所述第一本体31具有相对设置的第一侧面和第二侧面，所述第一侧面朝向所述壳体1的内部，所述第二侧面朝向所述壳体1的外部，所述第一限位部322设置在所述第一侧面，所述连接部321远离所述第一限位部322的一端穿过所述安装孔311延伸至所述第二侧面，所述连接部321与所述安装孔311的孔壁之间设置第一绝缘件33，所述第一限位部322与所述第一本体31之间设置第二绝缘件34。通过设置T型结构的电极连接件32，可以与第一本体31形成良好的装配，并为电芯2的极耳提供焊接的位置；通过设置第一绝缘件33和第二绝缘件34，可以避免电极连接件32和第一本体31之间发生电导通，进而防止电极连接件32与壳体1发生电导通。
在本实施例中，所述连接部321远离所述第一限位部322的一端设置第二限位部36，所述第二限位部36和所述第一限位部322分别设置在所述第一本体31的两侧，所述第二限位部36与所述第一本体31之间设置第三绝缘件35。通过设置第二限位部36，可以增加电池与外部电源连接的位置的面积，提升电导通的可靠性；通过设置第三绝缘件35，可以避免第二限位部36与第一本体31之间发生电导通。
在一实施例中，连接部321与第二限位部36铆接。
在一实施例中，所述第一绝缘件33、所述第二绝缘件34和所述第三绝缘件35采用塑料一体注塑成型。一体注塑成型的三个绝缘件可以有效地降低组装难度，同时还能保证密封和绝缘的可靠性，使第一盖组3组装后形成一整体结构，便于第一盖组3和壳体1组装。
在本实施例中，所述第一绝缘件33、第二绝缘件34和第三绝缘件35组成的 整体结构采用聚乙烯(Polyethylene,PE)、聚丙烯(Polypropylene,PP)和聚四氟乙烯(Polytetrafluoro ethylene,PFA)、聚对苯二甲酸二丁酯(Polybutylene terephathalate,PBT)、聚苯基硫醚(Polyphenylene sulphide,PPS)等电绝缘塑料中的任意一种材料制成。
PE是乙烯经聚合制得的一种热塑性树脂。在工业上，也包括乙烯与少量α-烯烃的共聚物。聚乙烯无臭，无毒，手感似蜡，具有优良的耐低温性能(最低使用温度可达-100℃至-70℃)，化学稳定性好，能耐大多数酸碱的侵蚀。常温下不溶于一般溶剂，吸水性小，电绝缘性优良。
PP是丙烯加聚反应而成的聚合物，系白色蜡状材料，外观透明而轻，易燃，熔点165℃，在155℃左右软化，使用温度范围为-30℃～140℃。
PFA(又名过氟烷基化物、可溶性聚四氟乙烯)为少量全氟丙基全氟乙烯基醚与聚四氟乙烯的共聚物。熔融粘结性增强，溶体粘度下降，而性能与聚四氟乙烯相比无变化。此种树脂可以直接采用普通热塑性成型方法加工成制品。PFA长期使用于温度-200℃至260℃的环境中，有卓越的耐化学腐蚀性，对所有化学品都耐腐蚀，摩擦系数在塑料中最低，还有很好的电性能，其电绝缘性不受温度影响，有“塑料王”之称。PFA耐化学药品性与聚四氟乙烯相似，比偏氟乙烯好，抗蠕变性和压缩强度比聚四氟乙烯好，拉伸强度高，伸长率可达100-300％；介电性好，耐辐射性能优异；阻燃性大；无毒害，具有生理惰性，可植入人体内。
在一实施例中，电池的组装过程如下：
S100中，如图3所示，将电极连接件32、第一本体31和第二限位部36组装，使电极连接件32的连接部321远离第一限位部322的一端与第二限位部36铆接，在电极连接件32与第一本体31之间注塑形成绝缘件，以及在第二限位部36与第一本体31之间注塑形成绝缘件，以使电极连接件32、第一本体31和第二限位部36组装为一整体的第一盖组3；
S200中，如图6所示，卷绕电芯2，使电芯2的正极耳21与第一盖组3的第一限位部322(即电极连接件32)焊接；
S300中，如图7所示，将电芯2和第一盖组3与壳体1组装，使电芯2和第一盖组3装配于壳体1内，并从壳体1的外壁施焊，使第一本体31和壳体1焊接固定；
S400中，如图8所示，将电芯2的负极耳22与第二盖组4的第二本体41焊接；
S500中，如图9所示，使第二本体41装配于壳体1的另一端的开口内，并从 壳体1的外壁施焊，使第二本体41和壳体1焊接固定；
S600中，注液、化成；
S700中，如图1所示，在第二本体41上焊接封堵板42，以封堵注液孔411。
于本文的描述中，需要理解的是，术语“上”等方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述和简化操作，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。
在本说明书的描述中，参考术语“一实施例”等的描述意指结合该实施例的具体特征、结构、材料或者特点包含于本申请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一定指的是相同的实施例。

Claims (10)

  1. 一种电池，包括壳体，所述壳体内具有容纳腔；
    电芯，所述电芯安装于所述容纳腔内；
    第一盖组，所述第一盖组包括第一本体，及设置于所述第一本体上且与所述第一本体绝缘连接的电极连接件，所述第一本体设置为***到所述壳体内且所述第一本体的侧壁与所述壳体的侧壁焊接；及
    第二盖组，所述第二盖组包括第二本体，所述第二本体设置为***到所述壳体内且所述第二本体的侧壁与所述壳体的侧壁焊接；
    其中，所述壳体的两端分别设置有开口，其中一个所述开口通过所述第一盖组封堵，另一个所述开口通过所述第二盖组封堵；
    所述电芯设有两个极耳，其中一极耳与所述电极连接件连接，另一极耳与所述第二本体连接。
  2. 根据权利要求1所述电池，其中，所述第二本体上贯穿开设注液孔，所述注液孔通过封堵件封堵。
  3. 根据权利要求1所述电池，其中，所述第一本体的侧壁环形设置一圈第一限位件，所述第一限位件靠近所述壳体的一侧面与所述壳体的端面抵接。
  4. 根据权利要求1所述电池，其中，所述第二本体的侧壁环形设置一圈第二限位件，所述第二限位件靠近所述壳体的一侧面与所述壳体的端面抵接。
  5. 根据权利要求1至4任一项所述电池，还包括第一绝缘件和第二绝缘件，所述电极连接件包括连接部和第一限位部，所述第一限位部固定在所述连接部的一端，所述第一本体上贯穿开设安装孔，所述第一本体具有相对设置的第一侧面和第二侧面，所述第一侧面朝向所述壳体的内部，所述第二侧面朝向所述壳体的外部，所述第一限位部设置在所述第一侧面，所述连接部远离所述第一限位部的一端穿过所述安装孔延伸至所述第二侧面；
    所述第一绝缘件设置于所述连接部与所述安装孔的孔壁之间，所述第二绝缘件设置于所述第一限位部与所述第二本体之间。
  6. 根据权利要求5所述电池，还包括第三绝缘件，所述连接部远离所述第一限位部的一端设置第二限位部，所述第二限位部和所述第一限位部分别设置在所述第一本体的两侧，所述第三绝缘件设置于所述第二限位部与所述第一本体之间。
  7. 根据权利要求6所述电池，其中，所述第一绝缘件、所述第二绝缘件和所述第三绝缘件采用塑料一体注塑成型。
  8. 根据权利要求1所述电池，其中，所述壳体为圆柱形，所述壳体的高度与直径比大于等于2：1。
  9. 根据权利要求8所述电池，其中，所述壳体的直径小于5mm。
  10. 根据权利要求9所述电池，其中，所述壳体的直径为3mm。
PCT/CN2021/132103 2021-01-13 2021-11-22 电池 WO2022151837A1 (zh)

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