WO2021237711A1 - 电池和具有所述电池的用电装置 - Google Patents

电池和具有所述电池的用电装置 Download PDF

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Publication number
WO2021237711A1
WO2021237711A1 PCT/CN2020/093451 CN2020093451W WO2021237711A1 WO 2021237711 A1 WO2021237711 A1 WO 2021237711A1 CN 2020093451 W CN2020093451 W CN 2020093451W WO 2021237711 A1 WO2021237711 A1 WO 2021237711A1
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WO
WIPO (PCT)
Prior art keywords
tab
housing
pole
electrically connected
battery
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Application number
PCT/CN2020/093451
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English (en)
French (fr)
Inventor
张国文
周权
Original Assignee
宁德新能源科技有限公司
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 宁德新能源科技有限公司 filed Critical 宁德新能源科技有限公司
Priority to CN202080099875.5A priority Critical patent/CN115413384A/zh
Priority to PCT/CN2020/093451 priority patent/WO2021237711A1/zh
Publication of WO2021237711A1 publication Critical patent/WO2021237711A1/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
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • This application relates to a battery and an electric device with the battery.
  • a battery usually includes a casing and a battery cell located in the casing.
  • the battery cell includes a positive electrode sheet, a separator film and a negative electrode sheet, and the current collectors of both the positive electrode sheet and the negative electrode sheet need to be provided with tabs to realize the conduction of electrons.
  • multiple tabs need to be gathered and then soldered to the metal sheet, and then exported from the metal sheet.
  • the tabs usually need to be cut before transfer welding. The burrs produced by cutting may pierce the isolation membrane and cause short circuits inside the battery, which may cause safety risks.
  • transfer welding makes the structure of the tabs complicated, resulting in The battery energy density is low.
  • the present application provides a battery including a casing and a battery cell accommodated in the casing, and the battery cell includes a first pole piece and a second pole piece.
  • the first pole piece includes a first tab and a second tab, the first tab is electrically connected to the second tab, and the second tab is electrically connected to the housing.
  • the second pole piece includes a third pole and a fourth pole, the third pole is electrically connected to the fourth pole, and the fourth pole is electrically connected to the fourth pole. ⁇ Said shell.
  • the housing includes a first housing and a second housing covered on the first housing, and the pole is provided on the second housing and is connected to the first housing.
  • the two shells are electrically isolated, the second tab is electrically connected to the pole, and the fourth tab is electrically connected to the second shell or the first shell.
  • the second tab includes a first part and a second part connecting the first part, and the first tab is welded to the first part to form a first welding part.
  • the fourth tab includes a third part and a fourth part connecting the third part, and the third tab is welded to the third part to form a second welding part.
  • the battery further includes a first insulating member housed in the housing, and the battery core includes a first end, a second end opposite to the first end, and Connected to the outer circumference between the first end and the second end, the first tab is connected to the outer circumference, and the first insulating member is located between the first housing and the second end Part and/or between the second housing and the first end part.
  • the battery further includes a second insulating member housed in the housing, and the second insulating member is located between the first housing and the outer periphery.
  • the first welding portion and/or the second welding portion are located between the second insulating member and the outer circumference, and the first welding portion and/or the second welding portion Insulating glue is provided on the welding part.
  • the housing includes a first housing and a second housing covering the first housing, and the first housing is electrically isolated from the second housing, The second tab is electrically connected to the second housing, and the fourth tab is electrically connected to the first housing.
  • the number of the second tab and/or the fourth tab is at least two.
  • the first tab and the second tab are electrically connected by conductive glue, and/or the third tab and the fourth tab are electrically connected by conductive glue.
  • the present application also provides an electric device, which includes the battery as described above.
  • the first tab is electrically connected to the second tab
  • the second tab is electrically connected to the housing, thereby omitting the existing transfer welding process (that is, the first tab and the second tab)
  • the tabs are electrically connected to the adapter, and then electrically connected to other components through the adapter), and avoid the burr problem caused by cutting the tabs before the transfer welding, so as to avoid the short circuit of the battery and improve the safety performance; moreover, omit Transfer welding can reduce the volume after the tabs are connected, and is beneficial to increase the energy density under the premise of a certain battery volume.
  • Fig. 1 is a top view of a battery according to an embodiment of the application.
  • Fig. 2 is a side view of the battery shown in Fig. 1.
  • Fig. 3 is a cross-sectional view of the battery shown in Fig. 1 along A-A.
  • Fig. 4 is an enlarged view of the battery shown in Fig. 3 at IV.
  • Fig. 5 is an enlarged view of the battery shown in Fig. 3 at V.
  • Fig. 6 is a cross-sectional view of a battery in another embodiment.
  • FIG. 7 is a schematic diagram of the structure of an electrical device according to an embodiment of the application.
  • the first end 20a The first end 20a
  • the first pole piece 21 is the first pole piece 21
  • the first part 2121 is the first part 2121
  • the third part 2221 is the third part 2221
  • an embodiment of the present application provides a battery 100, which includes a casing 10 and a battery core 20 housed in the casing 10.
  • the battery cell 20 includes a first pole piece 21, a second pole piece 22 and an isolation film located between the first pole piece 21 and the second pole piece 22.
  • the first pole piece 21 includes a first lug 211 and a second lug 212. Please refer to FIG. 4 together.
  • the first lug 211 is electrically connected to the second lug 212, and the second lug 212 Electrically connected to the housing 10.
  • the length of the second tab 212 is greater than the length of the first tab 211.
  • the length of the second tab 212 can also be equal to or less than the length of the first tab 211.
  • the number of the first tab 211 may be multiple, and the number of the second tab 212 may be at least one.
  • the present application provides that a plurality of the first tabs 211 can be electrically connected to at least one of the second tabs 212, and the second tab 212 is electrically connected to the housing, thereby omitting the existing transfer welding process and avoiding The burr problem caused by cutting the tabs before the transfer welding can avoid the short circuit of the battery core 20 and improve the safety performance.
  • the omission of transfer welding can reduce the volume after the tabs are connected, and on the premise of a certain volume of the battery 100, it is beneficial to increase the energy density.
  • the second pole piece 22 includes a third pole 221 and a fourth pole 222, and the third pole 221 is electrically connected to the fourth pole.
  • the ear 222 and the fourth tab 222 are electrically connected to the housing 10.
  • the length of the fourth tab 222 is greater than the length of the third tab 221, of course, the fourth tab 222 can also be equal to or less than the length of the third tab 221.
  • the number of the third tab 221 may be multiple, and the number of the fourth tab 222 may be at least one.
  • a plurality of the third tabs 221 can be electrically connected to at least one of the fourth tabs 222, and then the fourth tab 222 is electrically connected to the housing 10, thereby omitting the existing transfer welding process.
  • the safety performance and energy density of the battery core 20 are further improved.
  • the plurality of first tabs 211 and the plurality of second tabs 222 can be bent into a U shape.
  • the first pole piece 21 includes a first current collector and a first active material layer disposed on the first current collector, and the first tab 211 and the second tab 212 are both connected to the The first current collector is not covered by the first active material layer.
  • the second pole piece 22 includes a second current collector and a second active material layer disposed on the second current collector, and the third tab 221 and the fourth tab 222 are both connected to the first The second current collector is not covered by the second active material layer.
  • the first pole piece 21 and the second pole piece 22 exhibit opposite electrical polarity.
  • the first pole piece 21 may be a negative pole piece
  • the second pole piece 22 may be a positive pole piece.
  • the housing 10 includes a first housing 11, a second housing 12 covering the first housing 11, and a pole 13.
  • the pole 13 is disposed on the second housing 12 and is electrically isolated from the second housing 12, the second lug 212 is electrically connected to the pole 13, and the fourth lug 222 It is electrically connected to the second housing 12 or the first housing 11.
  • the pole 13 By electrically connecting the second tab 212 to the pole 13, the pole 13 can exhibit the same electrical polarity as the first pole piece 21, for example, when the first pole piece 21 is a negative electrode In the case of a pole piece, the pole 13 may exhibit a negative polarity.
  • the second tab 212 is directly electrically connected to the pole 13 without transfer welding.
  • the fourth tab 222 By electrically connecting the fourth tab 222 to the second housing 12 or the first housing 11, the second housing 12 or the first housing 11 can be connected to the second housing 12 or the first housing 11.
  • the pole pieces 22 have the same electrical polarity. For example, when the second pole piece 22 is a positive pole piece, the second casing 12 or the first casing 11 may have a positive polarity.
  • the pole 13 can also be disposed on the first housing 11 and electrically isolated from the first housing 11.
  • the second tab 212 is electrically connected to the pole 13, and the fourth tab 222 is electrically connected to the second housing 12 or the first housing 11. Since the length of the second tab 212 is relatively long, the second tab 212 can adapt to different installation positions of the pole 13 on the housing 10.
  • the pole 13 may also be omitted.
  • the first housing 11 is electrically isolated from the second housing 12, the second lug 212 is electrically connected to the second housing 12, and the fourth lug 222 is electrically connected to the first housing.
  • One case 11 Therefore, the electrical polarity of the first pole piece 21 and the second pole piece 22 can be led out to the second housing 12 and the first housing 11 respectively.
  • an insulating layer (not shown) may be provided between the first housing 11 and the second housing 12, and the insulating layer is used to make the first housing 11 and the second housing 11
  • the housing 12 is electrically isolated.
  • the second tab 212 includes a first part 2121 and a second part 2122 connected to the first part 2121, and the first tab 211 is welded to the The first part 2121 forms a first welding part 213.
  • the first tab 211 can also be electrically connected to the second tab 212 through conductive glue.
  • the fourth tab 222 includes a third part 2221 and a fourth part 2222 connected to the third part 2221, and the third tab 221 is welded to the third part 2221.
  • the three parts 2221 form the second welding part 223.
  • the welding may be ultrasonic welding.
  • the third tab 221 can also be electrically connected to the fourth tab 222 through conductive glue.
  • the portion of the second tab 212 that extends from the first tab 211 is the second portion 2122.
  • the portion of the fourth tab 222 that extends from the third tab 221 is the fourth portion 2222.
  • the second tab 212 is connected to the pole 13 through the second part 2122, and the fourth tab 222 is electrically connected to the second housing 12 or the first housing 12 through the fourth part 2222.
  • the battery 100 further includes a first insulating member 30 housed in the casing 10, and the battery core 20 includes a first end 20a and a first end 20a.
  • the second end 20b opposite to the end 20a and the outer periphery 20c connected between the first end 20a and the second end 20b.
  • the first tab 211 is connected to the outer periphery 20c, and the first insulating member 30 is located between the second housing 12 and the first end 20a and/or the first housing 11 and the first end 20a. Between the two ends 20b.
  • the number of the first insulating member 30 is two.
  • One of the first insulators 30 is located between the first end portion 20a and the second housing 12, and is used to prevent the battery core 20 from directly contacting the pole 13 to avoid a short circuit.
  • the other first insulating member 30 is located between the second end portion 20b and the first housing 11, and is used to prevent the battery core 20 from directly contacting the bottom wall of the first housing 11, This further avoids the occurrence of short circuits.
  • the material of the first insulating member 30 can be selected from polypropylene (PP), polyurethane (PU), polystyrene (PS), polyethylene (PE), polyimide (PI), polyester (PET), At least one of polycarbonate (PC), polyvinyl chloride (PVC), polyamide (PA) and other polymer materials.
  • the first insulating member 30 may be a single-layer structure or a multilayer composite structure.
  • the battery 100 further includes a second insulating member 40 housed in the housing 10, and the second insulating member 40 is located between the first housing 11 and the housing. Between the outer circumference 20c. Wherein, the second insulating member 40 is used to prevent the battery core 20 from directly contacting the side wall of the first housing 11, thereby further avoiding a short circuit.
  • first welding part 213 and/or the second welding part 223 are located between the second insulating member 40 and the outer periphery 20c of the battery core 20.
  • An insulating glue 41 is provided on the first welding part 213 and/or the second welding part 223. Wherein, the insulating glue 41 is used to prevent the first welding portion 213 and/or the second welding portion 223 from directly contacting pole pieces with opposite electrical polarity, thereby preventing short circuits.
  • the insulating glue 41 is also used to provide a buffer force to the first welding part 213 and/or the second welding part 223, thereby restricting the first welding part 213 and/or the second welding part 223 due to Bending stress caused by bending.
  • the cell 20 is a laminated cell, and includes a plurality of first pole pieces 21 and a plurality of second pole pieces 22. Three of the first pole pieces 21 are connected with the second tab 212, and the other plurality of first pole pieces 21 are connected with the first tab 211.
  • the second tab 212 is located on any layer of the top, bottom or middle of the plurality of first tabs 211.
  • the fourth tab 222 is connected to three of the second pole pieces 22, and the third tab 221 is connected to the other plurality of second pole pieces 22.
  • the fourth tab 222 is located on any layer of the top, bottom or middle of the plurality of third tabs 221.
  • the first housing 11 is provided with an accommodating space 110 for accommodating the battery core 20, and the second housing 12 is mounted on the first housing 11 To close the accommodating space 110. That is, the second housing 12 is the top cover of the housing 10.
  • the material of the first housing 11 and the second housing 12 may be metal.
  • the material of the first shell 11 and the second shell 12 may be steel alloy, aluminum alloy, iron alloy, copper alloy, nickel alloy, or the like.
  • the first housing 11 and the second housing 12 are connected by welding or glue.
  • the battery 100 in this embodiment is a button battery, and the materials of the first housing 11 and the second housing 12 are both stainless steel.
  • the first shell 11 and the second shell 12 can be formed into desired shapes by using processes such as laser cutting and machine tool processing.
  • the first housing 11 may also be formed by stamping and forming a punching pit (that is, the accommodating space 110).
  • the second housing 12 is provided with a liquid injection hole (not shown), and electrolyte can be injected through the liquid injection hole.
  • a liquid injection plug 14 is provided in the liquid injection hole, and the liquid injection plug 14 is used to seal the liquid injection hole to prevent the injected electrolyte from leaking or external impurities from entering the battery.
  • the liquid injection hole may also be located on the first housing 11.
  • FIG. 6 another embodiment of the present application further provides a battery 200.
  • the difference from the battery 100 is that the number of the second tab 212 and/or the fourth tab 222 may be at least two. As shown in FIG. 6, the number of the fourth tab 222 may be two.
  • Part of the third tab 221 is electrically connected to one of the fourth tabs 222 and is electrically connected to the second housing 12 through the fourth tab 222.
  • the remaining third tabs 221 are electrically connected to the other fourth tabs 222, and are electrically connected to the bottom wall of the first housing 11 through the fourth tabs 222.
  • first housing 11 and the second housing 12 can both exhibit the same electrical polarity as the second pole piece 22.
  • the two fourth tabs 222 can both be electrically connected to the first housing 11, or both can be electrically connected to the second housing 12, which can be specifically set according to actual conditions, which is not limited.
  • the third tab 221 of the second pole piece 22 (that is, the part of the second pole piece 22 close to the pole 13) located on the upper half of the cell 20 can be electrically connected to the fourth tab. 222. Electrically connect the third tab 221 of the second pole piece 21 located at the lower half of the battery core 20 to the fourth tab 222.
  • the internal resistance of the battery core 20 can be reduced.
  • this application also provides an electric device 1, and the electric device 1 includes the battery 100 or the battery 200 as described above.
  • the electrical device 1 may be a consumer electronic product, such as a smart phone. It can be understood that, in other embodiments, the electrical device 1 may also be an electric tool, an energy storage device, a power device, and the like. For example, the electrical device 1 may also be an electric vehicle.

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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)

Abstract

一种电池（100），包括外壳（10）和容置于所述外壳（10）内的电芯（20），所述电芯（20）包括第一极片（21）和第二极片（22）。所述第一极片（21）包括第一极耳（211）和第二极耳（212），所述第一极耳（211）电连接至所述第二极耳（212），所述第二极耳（212）电连接所述外壳（10）。上述技术方案可以提高电池（100）的安全性能和能量密度。

Description

电池和具有所述电池的用电装置 技术领域
本申请涉及一种电池和具有所述电池的用电装置。
背景技术
众所周知，电池通常包括壳体和位于所述壳体内的电芯。所述电芯包括正极片、隔离膜和负极片，正极片和负极片的集流体上均需设置极耳以实现电子的传导。对于包含多极耳的电池，需要将多个极耳聚集然后转接焊到金属片，再由金属片导出。然而，所述极耳在转接焊前通常需要进行裁切，裁切产生的毛刺可能会刺穿隔离膜，造成电池内部短路，从而引发安全风险，且转接焊使得极耳结构复杂，导致电池能量密度低。
发明内容
有鉴于此，有必要提供一种能够提高安全性能和能量密度的电池。
另外，还有必要提供一种具有所述电池的用电装置。
本申请提供一种电池，包括外壳和容置于所述外壳内的电芯，所述电芯包括第一极片和第二极片。所述第一极片包括第一极耳和第二极耳，所述第一极耳电连接至所述第二极耳，所述第二极耳电连接所述外壳。
在本申请一些实施例中，所述第二极片包括第三极耳和第四极耳，所述第三极耳电连接至所述第四极耳，所述第四极耳电连接所述外壳。
在本申请一些实施例中，所述外壳包括第一壳体和盖设于所述第一壳体上的第二壳体，所述极柱设置于所述第二壳体且与所述第二壳体电性隔绝，所述第二极耳电连接于所述极柱，所述第四极耳电连接于所述第二壳体或所述第一壳体。
在本申请一些实施例中，所述第二极耳包括第一部分和连接所述第一部分的第二部分，所述第一极耳焊接至所述第一部分形成第一焊接部。
在本申请一些实施例中，所述第四极耳包括第三部分和连接所述第三部分的第四部分，所述第三极耳焊接至所述第三部分形成第二焊接部。
在本申请一些实施例中，所述电池还包括容置于所述外壳中的第一绝缘件，所述电芯包括第一端部、与所述第一端部相对的第二端部以及连接于所述第一端部和所述第二端部之间的外周，所述第一极耳连接所述外周，所述第一绝缘件位于所述第一壳体与所述第二端部和/或所述第二壳体与所述第一端部之间。
在本申请一些实施例中，所述电池还包括容置于所述外壳中的第二绝缘件，所述第二绝缘件位于所述第一壳体与所述外周之间。
在本申请一些实施例中，所述第一焊接部和/或所述第二焊接部位于所述第二绝缘件与所述外周之间，所述第一焊接部和/或所述第二焊接部上设有绝缘胶。
在本申请一些实施例中，所述外壳包括第一壳体和盖设于所述第一壳体上的第二壳体，所述第一壳体与所述第二壳体电性隔绝，所述第二极耳电连接于所述第二壳体，所述第四极耳电连接于所述第一壳体。
在本申请一些实施例中，所述第二极耳和/或所述第四极耳的数量为至少两个。
在本申请一些实施例中，所述第一极耳与所述第二极耳通过导电胶电连接，和/或所述第三极耳与所述第四极耳通过导电胶电连接。
本申请还提供一种用电装置，所述用电装置包括如上所述的电池。
本申请设置所述第一极耳电连接至所述第二极耳，所述第二极耳电连接至所述外壳，从而省略现有的转接焊工艺(即将第一极耳和第二极耳均电连接到转接件，通过转接件再和其他部件电连接)，并避免转接焊之前裁切极耳造成的毛刺问题，从而避免电芯短路，提高安全性能；而且，省略转接焊可以减小极耳连接后的体积，在电池体积一定的前提下，有利于提高能量密度。
附图说明
图1为本申请一实施方式的电池的俯视图。
图2为图1所示的电池的侧视图。
图3为图1所示的电池沿A-A的剖视图。
图4为图3所示的电池于IV处的放大图。
图5为图3所示的电池于V处的放大图。
图6为另一实施例中电池的剖视图。
图7为本申请一实施方式的用电装置的结构示意图。
主要元件符号说明
用电装置         1
外壳             10
第一壳体         11
第二壳体         12
极柱             13
注液塞           14
电芯             20
第一端部         20a
第二端部         20b
外周             20c
第一极片         21
第二极片         22
第一绝缘件       30
第二绝缘件       40
绝缘基板         41
胶粘层           42
电池             100，200
容置空间         110
第一极耳         211
第二极耳         212
第一焊接部       213
第三极耳         221
第四极耳         222
第二焊接部       223
第一部分         2121
第二部分         2122
第三部分         2221
第四部分         2222
如下具体实施方式将结合上述附图进一步说明本申请。
具体实施方式
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅为本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有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。
除非另有定义，本文所使用的所有的技术和科学术语与属于本申请的技术领域的技术人员通常理解的含义相同。本文中在本申请的说明书中所使用的术语只是为了描述具体的实施方式的目的，不是旨在于限制本申请。
下面结合附图，对本申请的一些实施方式作详细说明。在不冲突的情况下，下述的实施方式及实施方式中的特征可以相互组合。
请参阅图1至图3，本申请一实施方式提供一种电池100，包括外壳10和容置于所述外壳10内的电芯20。所述电芯20包括第一极片21、第二极片22和位于所述第一极耳21和所述第二极片22之间的隔离膜。所述第一极片 21包括第一极耳211和第二极耳212，请一并参与图4，所述第一极耳211电连接至所述第二极耳212，第二极耳212电连接至外壳10。如图4所示，所述第二极耳212的长度大于所述第一极耳211的长度，当然第二极耳212的长度也可等于或小于第一极耳211的长度。
其中，所述第一极耳211的数量可以为多个，第二极耳212的数量可以为至少一个。本申请设置多个所述第一极耳211均可电连接至至少一所述第二极耳212，由第二极耳212电连接到外壳，从而省略现有的转接焊工艺，并避免转接焊之前裁切极耳造成的毛刺问题，从而避免电芯20短路，提高安全性能。而且，省略转接焊可以减小极耳连接后的体积，在电池100体积一定的前提下，有利于提高能量密度。
如图3和图5所示，在本实施例中，所述第二极片22包括第三极耳221和第四极耳222，所述第三极耳221电连接至所述第四极耳222，第四极耳222电连接到外壳10。在本实施例中，所述第四极耳222的长度大于所述第三极耳221的长度，当然第四极耳222也可等于或小于第三极耳221的长度。
其中，所述第三极耳221的数量可以为多个，第四极耳222的数量可以为至少一个。本申请设置多个所述第三极耳221均可电连接至至少一所述第四极耳222，再由第四极耳222电连接到外壳10，从而省略现有的转接焊工艺，进一步提高电芯20的安全性能和能量密度。
可以理解，如图3，为了提高能量密度，防止极耳受力拉伸导致极片错位短路，多个所述第一极耳211和多个第二极耳222均可以弯折成U型。
其中，所述第一极片21包括第一集流体和设置于所述第一集流体上的第一活性材料层，所述第一极耳211和所述第二极耳212均连接于所述第一集流体，且未被所述第一活性材料层覆盖。所述第二极片22包括第二集流体和设置于所述第二集流体上的第二活性材料层，所述第三极耳221和所述第四极耳222均连接于所述第二集流体，且未被所述第二活性材料层覆盖。所述第一极片21与所述第二极片22呈现相反的电极性，如，所述第一极片21可以为负极极片，所述第二极片22可以为正极极片。
如图2和图3所示，在本实施例中，所述外壳10包括第一壳体11、盖设于所述第一壳体11上的第二壳体12、以及极柱13。所述极柱13设置于所述第二壳体12且与所述第二壳体12电性隔绝，所述第二极耳212电连接于所述极柱13，所述第四极耳222电连接于所述第二壳体12或所述第一壳体11。
通过将所述第二极耳212电连接于所述极柱13，所述极柱13可呈现与所述第一极片21相同的电极性，如，当所述第一极片21为负极极片时，所述极柱13可呈现负极性。所述第二极耳212不需进行转接焊直接与所述极柱13电连接。通过将所述第四极耳222电连接于所述第二壳体12或所述第一壳体11，所述第二壳体12或所述第一壳体11可呈现与所述第二极片22相同的电极性，如，当所述第二极片22为正极极片时，所述第二壳体12或所述第一壳体11可呈现正极性。
在另一实施例中，所述极柱13还可设置于所述第一壳体11且与所述第一壳体11电性隔绝。所述第二极耳212电连接于所述极柱13，所述第四极耳222电连接于所述第二壳体12或所述第一壳体11。由于所述第二极耳212的长度较长，所述第二极耳212能够适应所述极柱13在所述外壳10上不同的安装位置。
在又一实施例中，所述极柱13也可以省略。所述第一壳体11与所述第二壳体12电性隔绝，所述第二极耳212电连接于所述第二壳体12，所述第四极耳222电连接于所述第一壳体11。从而，所述第一极片21和所述第二极片22的电极性可分别引出至所述第二壳体12和所述第一壳体11。此时，所述第一壳体11和所述第二壳体12之间可设有绝缘层(图未示)，所述绝缘层用于使所述第一壳体11和所述第二壳体12之间电性隔绝。
如图3和图4所示，在本实施例中，所述第二极耳212包括第一部分2121和连接所述第一部分2121的第二部分2122，所述第一极耳211焊接至所述第一部分2121形成第一焊接部213。当然第一极耳211也可以通过导电胶电连接到第二极耳212。
进一步的，如图3和图5所示，所述第四极耳222包括第三部分2221和 连接所述第三部分2221的第四部分2222，所述第三极耳221焊接至所述第三部分2221形成第二焊接部223。其中，所述焊接可以为超声波焊接。当然第三极耳221也可通过导电胶电连接到第四极耳222。
其中，所述第二极耳212相较于所述第一极耳211伸出的部分即为所述第二部分2122。所述第四极耳222相较于所述第三极耳221伸出的部分即为所述第四部分2222。所述第二极耳212通过所述第二部分2122连接于所述极柱13，所述第四极耳222通过所述第四部分2222电连接于所述第二壳体12或所述第一壳体11。
如图3所示，在本实施例中，所述电池100还包括容置于所述外壳10中的第一绝缘件30，所述电芯20包括第一端部20a、与所述第一端部20a相对的第二端部20b以及连接于所述第一端部20a和所述第二端部20b之间的外周20c。所述第一极耳211连接所述外周20c，所述第一绝缘件30位于所述第二壳体12与所述第一端部20a和/或所述第一壳体11与所述第二端部20b之间。
在本实施方式中，所述第一绝缘件30的数量为两个。其中一所述第一绝缘件30位于所述第一端部20a和所述第二壳体12之间，用于防止所述电芯20与所述极柱13直接接触，进而避免短路情况发生。另一所述第一绝缘件30位于所述第二端部20b和所述第一壳体11之间，用于防止所述电芯20与所述第一壳体11的底壁直接接触，进而进一步避免短路情况发生。
所述第一绝缘件30的材质可以选自聚丙烯(PP)、聚氨酯(PU)、聚苯乙烯(PS)、聚乙烯(PE)、聚酰亚胺(PI)、聚酯(PET)、聚碳酸酯(PC)、聚氯乙烯(PVC)、聚酰胺(PA)等高分子材质中的至少一种。所述第一绝缘件30可以是单层结构，也可以是多层复合结构。
如图3所示，在本实施例中，所述电池100还包括容置于所述外壳10中的第二绝缘件40，所述第二绝缘件40位于所述第一壳体11与所述外周20c之间。其中，所述第二绝缘件40用于防止所述电芯20与所述第一壳体11的侧壁直接接触，进而进一步避免短路情况发生。
进一步地，所述第一焊接部213和/或所述第二焊接部223位于所述第二绝缘件40和所述电芯20的外周20c之间。所述第一焊接部213和/或所述第二焊接部223上设有绝缘胶41。其中，所述绝缘胶41用于防止所述第一焊接部213和/或所述第二焊接部223和具有相反的电极性的极片直接接触，从而防止短路。所述绝缘胶41还用于向所述第一焊接部213和/或所述第二焊接部223提供缓冲力，从而限制所述第一焊接部213和/或所述第二焊接部223由于弯曲而产生的弯曲应力。
如图4和图5所示，在本实施例中，所述第二极耳212和所述第四极耳222的数量均为三个。所述电芯20为叠片电芯，包括多个第一极片21和多个第二极片22。其中三个所述第一极片21上连接有所述第二极耳212，其它多个所述第一极片21上均连接有所述第一极耳211。所述第二极耳212位于多个所述第一极耳211的顶部、底部或中间任意层。同理，其中三个所述第二极片22上连接有所述第四极耳222，其它多个所述第二极片22上均连接有所述第三极耳221。所述第四极耳222位于多个所述第三极耳221的顶部、底部或中间任意层。
如图3所示，在本实施方式中，所述第一壳体11设有用于收容所述电芯20的容置空间110，所述第二壳体12安装于所述第一壳体11以封闭所述容置空间110。即，所述第二壳体12为所述外壳10的顶盖。所述第一壳体11和所述第二壳体12的材质可以为金属。如，所述第一壳体11和所述第二壳体12的材质可以为钢合金、铝合金、铁合金、铜合金、镍合金等。所述第一壳体11和所述第二壳体12通过焊接或粘胶的方式连接。
如图1至图2所示，本实施方式中的所述电池100为扣式电池，所述第一壳体11和所述第二壳体12的材质均为不锈钢。制备时，所述第一壳体11和所述第二壳体12可以采用激光切割、机床加工等工艺形成所需的形状。所述第一壳体11还可以采用冲压成型形成冲坑(即，所述容置空间110)。
如图1所示，在本实施方式中，所述第二壳体12设有注液孔(图未示)，电解液可经所述注液孔注入。所述注液孔中设有注液塞14，所述注液塞14 用于密封所述注液孔，避免注入的电解液漏出或避免外界杂质进入电池内部。当然，所述注液孔还可以位于所述第一壳体11上。
请参阅图6，本申请另一实施方式还提供一种电池200。与所述电池100不同之处在于：所述第二极耳212和/或所述第四极耳222的数量可以为至少两个。如图6所示，所述第四极耳222的数量可以为两个。部分所述第三极耳221电连接于其中一所述第四极耳222，且通过所述第四极耳222电连接于所述第二壳体12。其余的所述第三极耳221电连接于另一所述第四极耳222，且通过所述第四极耳222电连接于所述第一壳体11的底壁。
如此，所述第一壳体11和所述第二壳体12可均呈现与所述第二极片22相同的电极性。当然，两个所述第四极耳222可均电连接于第一壳体11，还可均电连接于所述第二壳体12，具体可以根据实际情况进行设定，此不做限定。
实际制备时，可以将位于所述电芯20上半部分的第二极片22(即靠近极柱13的部分第二极片22)的第三极耳221电连接于所述第四极耳222，将位于所述电芯20下半部分的第二极片21的第三极耳221电连接于所述第四极耳222。通过设置至少两个所述第二极耳212和/或所述第四极耳222，可以减小所述电芯20的内阻。
请参阅图7，本申请还提供一种用电装置1，所述用电装置1包括如上所述的电池100或电池200。其中，所述用电装置1可以是消费性电子产品，如智能手机。可以理解，在其它实施方式中，所述用电装置1还可以为电动工具、储能装置、动力装置等。例如，所述用电装置1还可以是电动汽车。
以上所述仅为本申请的较佳实施例而已，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、等同替换和改进等，均应包含在本申请的保护范围之内。

Claims (12)

  1. 一种电池，包括外壳和容置于所述外壳内的电芯，所述电芯包括第一极片和第二极片，其特征在于，
    所述第一极片包括第一极耳和第二极耳，所述第一极耳电连接至所述第二极耳，所述第二极耳电连接所述外壳。
  2. 如权利要求1所述的电池，其特征在于，所述第二极片包括第三极耳和第四极耳，所述第三极耳电连接至所述第四极耳，所述第四极耳电连接所述外壳。
  3. 如权利要求2所述的电池，其特征在于，所述外壳包括第一壳体、盖设于所述第一壳体上的第二壳体和极柱，所述极柱设置于所述第二壳体且与所述第二壳体电性隔绝，所述第二极耳电连接于所述极柱，所述第四极耳电连接于所述第二壳体或所述第一壳体。
  4. 如权利要求3所述的电池，其特征在于，所述第二极耳包括第一部分和连接所述第一部分的第二部分，所述第一极耳焊接至所述第一部分形成第一焊接部。
  5. 如权利要求4所述的电池，其特征在于，所述第四极耳包括第三部分和连接所述第三部分的第四部分，所述第三极耳焊接至所述第三部分形成第二焊接部。
  6. 如权利要求5所述的电池，其特征在于，所述电池还包括容置于所述外壳中的第一绝缘件，所述电芯包括第一端部、与所述第一端部相对的第二端部以及连接于所述第一端部和所述第二端部之间的外周，所述第一极耳连接所述外周，所述第一绝缘件位于所述第一壳体与所述第二端部和/或所述第二壳体与所述第一端部之间。
  7. 如权利要求6所述的电池，其特征在于，所述电池还包括容置于所述外壳中的第二绝缘件，所述第二绝缘件位于所述第一壳体与所述外周之间。
  8. 如权利要求7所述的电池，其特征在于，所述第一焊接部和/或所述第 二焊接部位于所述第二绝缘件与所述外周之间，所述第一焊接部和/或所述第二焊接部上设有绝缘胶。
  9. 如权利要求2所述的电池，其特征在于，所述外壳包括第一壳体和盖设于所述第一壳体上的第二壳体，所述第一壳体与所述第二壳体电性隔绝，所述第二极耳电连接于所述第二壳体，所述第四极耳电连接于所述第一壳体。
  10. 如权利要求2所述的电池，其特征在于，所述第二极耳和/或所述第四极耳的数量为至少两个。
  11. 如权利要求2所述的电池，其特征在于，所述第一极耳与所述第二极耳通过导电胶电连接，和/或所述第三极耳与所述第四极耳通过导电胶电连接。
  12. 一种用电装置，其特征在于，所述用电装置包括如权利要求1-11中任一项所述的电池。
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