WO2022198531A1 - 电池和具有所述电池的电子装置 - Google Patents

电池和具有所述电池的电子装置 Download PDF

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Publication number
WO2022198531A1
WO2022198531A1 PCT/CN2021/082846 CN2021082846W WO2022198531A1 WO 2022198531 A1 WO2022198531 A1 WO 2022198531A1 CN 2021082846 W CN2021082846 W CN 2021082846W WO 2022198531 A1 WO2022198531 A1 WO 2022198531A1
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WIPO (PCT)
Prior art keywords
liquid injection
battery
injection port
casing
electrode assembly
Prior art date
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Ceased
Application number
PCT/CN2021/082846
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English (en)
French (fr)
Inventor
张弛
陈梦鹤
林礼清
刘常胜
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Ningde Amperex Technology Ltd
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Ningde Amperex Technology Ltd
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Publication date
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Priority to PCT/CN2021/082846 priority Critical patent/WO2022198531A1/zh
Priority to CN202180006150.1A priority patent/CN114730977A/zh
Publication of WO2022198531A1 publication Critical patent/WO2022198531A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • H01M50/60—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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0422—Cells or battery with cylindrical 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
    • H01M50/10—Primary casings; Jackets or wrappings
    • 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
    • H01M50/60—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
    • 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
    • H01M50/673—Containers for storing liquids; Delivery conduits therefor
    • H01M50/682—Containers for storing liquids; Delivery conduits therefor accommodated in battery or cell casings

Definitions

  • the present application relates to the technical field of energy storage, and in particular, to a battery and an electronic device having the battery.
  • a battery typically includes an electrode assembly, a case for accommodating the electrode assembly, and a top cover mounted to the case.
  • the top cover is usually provided with a liquid injection port, and the electrolyte is injected into the casing through the liquid injection port.
  • the liquid injection port is located above the electrode assembly, the electrolyte will be hindered by the electrode assembly during the liquid injection process, which reduces the liquid injection efficiency and affects the infiltration efficiency of the electrolyte to the pole pieces in the electrode assembly.
  • the present application provides a battery, comprising an electrode assembly, a first casing formed with an accommodation groove, and a second casing covering the accommodation groove, and the electrode assembly is accommodated in the accommodation groove.
  • the second housing includes a first surface facing the electrode assembly and a second surface opposite the first surface.
  • the second housing is provided with a liquid injection port extending through the first surface and the second surface.
  • the first surface includes a first groove in communication with the liquid injection port.
  • the plurality of the first grooves are distributed radially from the liquid injection port. Therefore, more channels are available for the electrolyte to flow on the first shell, and the electrolyte injected from the injection port can flow around the injection port, thereby further increasing the fluidity of the electrolyte.
  • a plurality of the first grooves are arranged symmetrically with respect to the liquid injection port. Therefore, the electrolyte injected through the injection port can evenly infiltrate various regions of the electrode assembly.
  • the first groove includes a first end for communicating with the liquid injection port and a second end opposite to the first end, the first end directly communicate with the liquid injection port.
  • the first surface further includes a second groove, and the first end communicates with the liquid injection port through the second groove.
  • the second groove can play a buffering role to prevent the electrolyte from overflowing from the liquid injection port when too much electrolyte is injected.
  • the electrode assembly includes a first side surface
  • the first housing includes a second side surface facing the first side surface
  • a defined space between the first side surface and the second side surface is defined between the first side surface and the second side surface.
  • the liquid injection space, the orthogonal projection of the liquid injection space on the second casing covers the second end. Therefore, during injection, the electrolyte flows along the first groove to the second end and can avoid the electrode assembly and directly flow into the injection space, that is, the electrolyte is not hindered by the electrode assembly during the injection process, and can quickly flow into the electrode assembly.
  • the liquid injection space on the side of the assembly allows the electrolyte to infiltrate the pole pieces in the electrode assembly from the side, thereby further improving the infiltration efficiency.
  • the second groove is arranged around the liquid injection port.
  • the distance between the second end portion and the edge of the second housing is 1 mm to 3 mm.
  • the first groove does not penetrate the second surface.
  • the number of the first grooves is 8, and the included angles between the extending directions of two adjacent first grooves are both 45°.
  • the electrode assembly includes a first pole piece, a separator, and a second pole piece.
  • the battery also includes a first tab electrically connected to the first pole piece and a second tab electrically connected to the second pole piece.
  • the first casing is provided with a pole, and the pole is electrically isolated from the first casing.
  • the first tab is electrically connected to the first casing or the second casing.
  • the second tab is electrically connected to the pole.
  • the electrode assembly includes a first side.
  • the first housing includes a second side facing the first side.
  • the second side surface includes a curved surface area and a planar area, and the pole post is disposed in the planar area.
  • the poles are arranged in the plane area of the first casing, which can avoid the increase of the thickness of the battery due to the poles, and also avoid the reduction of the number of pole pieces caused by occupying the space at the end of the battery due to the poles, so it is beneficial to Improve the energy density of the battery.
  • the liquid injection port is located at the geometric center of the second housing.
  • the battery further includes a sealing member, and the sealing member seals the liquid injection port.
  • the present application also provides an electronic device including the above battery.
  • a first groove that communicates with the liquid injection port is provided on the second shell.
  • the electrolyte can flow along the first groove, so that the fluidity of the electrolyte is improved, so as to fully infiltrate the liquid.
  • the pole piece of the electrode assembly Therefore, the present application can improve the liquid injection efficiency, thereby improving the infiltration efficiency of the electrolyte solution to the pole piece.
  • the liquid injection port does not need to be arranged at a position close to the edge of the second casing, that is, the liquid injection port can be flexibly arranged on the second casing. , so as to avoid the secondary edge melting of the second shell caused by the close distance between the liquid injection port and the edge of the second shell during subsequent welding.
  • FIG. 1 is a schematic diagram of the overall structure of a battery according to an embodiment of the present application.
  • FIG. 2 is a cross-sectional view along II-II of the battery shown in FIG. 1 in some embodiments.
  • FIG. 3 is a schematic structural diagram of the second casing of the battery shown in FIG. 1 in some embodiments.
  • FIG. 4 is a schematic structural diagram of the second casing of the battery shown in FIG. 1 in other embodiments.
  • FIG. 5 is a cross-sectional view along II-II of the battery shown in FIG. 1 in other embodiments.
  • FIG. 6 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
  • the first collector 111 The first collector 111
  • the first active material layer 112 is the first active material layer 112
  • the second collector 121 The second collector 121
  • an embodiment of the present application provides a battery 100 , which includes an electrode assembly 10 , a first case 20 formed with a receiving groove, and a second case 30 covering the receiving groove.
  • the electrode assembly 10 accommodates in the holding tank.
  • the electrode assembly 10 includes a first pole piece 11 , a second pole piece 12 , and an isolation film (not shown) disposed between the first pole piece 11 and the second pole piece 12 .
  • the separator is used to prevent the first pole piece 11 and the second pole piece 12 from directly contacting, thereby preventing the electrode assembly 10 from being short-circuited.
  • the electrode assembly 10 is a laminated structure, that is, the first pole piece 11 , the separator and the second pole piece 12 are sequentially laminated to form the electrode assembly 10 .
  • the electrode assembly 10 includes a first side 101 .
  • the electrode assembly 10 may also be a wound structure, that is, the first pole piece 11 , the separator and the second pole piece 12 are stacked and wound in sequence to form the electrode assembly 10 , which is not limited in this application.
  • the first housing 20 includes a bottom surface 201 and a second side surface 202 disposed around the periphery of the bottom surface 201 , and the second side surface 202 faces the first side surface 101 .
  • the second bottom surface 201 and the second side surface 202 together define a receiving groove (not shown) for receiving the electrode assembly 10.
  • the second casing 30 is installed on the side of the second side surface 202 away from the bottom surface 201 and covers the receiving groove for receiving the electrode assembly 10 .
  • the second casing 30 may be substantially a flat plate structure, including a first surface 301 facing the electrode assembly 10 and a second surface 302 opposite to the first surface 301 .
  • the second casing 30 is provided with a liquid injection port 31 penetrating through the first surface 301 and the second surface 302 , and the electrolyte can be injected into the interior of the receiving tank through the liquid injection port 31 .
  • the liquid injection port 31 may be geometrically symmetrical, such as a circle, an ellipse, a square, a hexagon, etc., and the liquid injection port 31 may be formed by punching or mechanical cutting.
  • the material of the first casing 20 and the second casing 30 may be metal.
  • the material of the first casing 20 and the second casing 30 may be steel alloy, aluminum alloy, iron alloy, copper alloy, nickel alloy, and the like.
  • the first shell 20 and the second shell 30 can be formed into desired shapes by laser cutting, machining and other processes.
  • the first casing 20 may also be formed by stamping to form a receiving groove, so as to accommodate the electrode assembly 10 .
  • the second casing 30 can be mounted on the first casing 20 by welding, so as to encapsulate the electrode assembly 10 in the receiving groove.
  • the first surface 301 includes a first groove 32 communicating with the liquid injection port 31 , and the first groove 32 does not penetrate through the second surface 302 .
  • the electrolyte can flow along the first groove 32 .
  • a seal 310 is provided in the injection port 31 .
  • the liquid injection port 31 is sealed by the sealing member 310 to prevent leakage of the injected electrolyte or prevent foreign impurities from entering the interior of the battery 100 .
  • the sealing member 310 may be a sealing nail made of a weldable material (eg, stainless steel or aluminum alloy). After the sealing nail is inserted into the liquid injection port 31 , the sealing nail and the second housing 30 are fixed together by laser welding. In this way, the sealing reliability of the liquid injection port 31 can be improved.
  • a first groove 32 that communicates with the liquid injection port 31 is provided on the first surface 301 of the second housing 30.
  • the electrolyte can flow along the first groove 32, The fluidity of the electrolyte is improved, so as to fully wet the pole pieces of the electrode assembly 10 . Therefore, the present application can improve the liquid injection efficiency, thereby improving the infiltration efficiency of the electrolyte solution to the pole piece.
  • the position of the liquid injection port is rearranged in order to avoid the electrode assembly during the liquid injection process, when the distance between the liquid injection port and the edge of the second shell is relatively close, the subsequent welding of the sealing nail and the second shell and welding When the second shell and the first shell, the welding positions interfere with each other, resulting in the risk of secondary edge fusion of the second shell.
  • the liquid injection port 31 it is not necessary to set the liquid injection port 31 at a position close to the edge of the second casing 30 in order to avoid the electrode assembly during the liquid injection process, that is, the liquid injection port can be flexibly arranged on the second casing. Therefore, the close distance between the liquid injection port 31 and the edge of the second shell 30 can prevent secondary edge melting of the second shell during subsequent welding.
  • the liquid filling port 31 is located at the geometric center of the second housing 30 .
  • an insulating member 40 may be provided between the electrode assembly 10 and the first surface 301 of the second casing 30.
  • the insulating member 40 is used to electrically isolate the electrode assembly 10 and the second casing 30 .
  • the insulating member 40 is also attached to the first surface 301 to form a channel for the electrolyte to flow at the second housing 30 .
  • the material of the insulating member 40 includes polypropylene (PP), polyethylene terephthalate (PET), polystyrene (PS), polyimide (PI), nylon or Teflon (PTFE) at least one of them.
  • the insulating member 40 may be a single-layer structure or a multi-layer composite structure.
  • the plurality of first grooves 32 are radially distributed from the liquid injection port 31 . Therefore, the number of channels for the electrolyte to flow on the first casing 20 is increased, and since the plurality of first grooves 32 are radially distributed from the liquid injection port 31, the electrolyte injected through the liquid injection port 31 can be injected into the liquid injection port 31. The flow around the port 31 further increases the fluidity of the electrolyte.
  • the plurality of first grooves 32 are symmetrically arranged with respect to the liquid injection port 31 . Therefore, the electrolyte injected through the liquid injection port 31 can evenly infiltrate various regions of the electrode assembly 10 .
  • the eight first grooves 32 are radially distributed by the liquid injection ports 31 , and the included angle between the extending directions of every two adjacent first grooves 32 is the same, which is 45 degrees. In other embodiments, the number of the first grooves 32 and the specific value of the angle between the adjacent first grooves 32 may also be different, which is not limited in the present application.
  • the first groove 32 may be set as a straight line.
  • the first groove 32 includes a first end portion 321 for communicating with the liquid injection port 31 and a second end portion 322 opposite to the first end portion 321 .
  • the first end portion 321 directly communicates with the liquid injection port 31 .
  • the electrolyte injected from the liquid injection port 31 directly enters the first end portion 321 and flows along the first groove 32 .
  • the first surface 301 further includes a second groove 33 , and the first end 321 communicates with the liquid injection port 31 through the second groove 33 .
  • the second groove 33 may be disposed around the liquid injection port 31 , and the first end portion 321 directly communicates with the outside of the second groove 33 .
  • the electrolyte injected from the liquid injection port 31 first flows through the second groove 33 , and then enters the first end portion 321 and flows along the first groove 32 .
  • the second groove 33 can play a buffer role to prevent the electrolyte from overflowing from the liquid injection port 31 when too much electrolyte is injected.
  • part of the first end 321 of the first groove 32 is directly connected to the liquid injection port 31 , and another part of the first end 321 of the first groove 32 is connected to the liquid injection port 31 through the second groove 33 .
  • the second groove 33 is only provided around a part of the liquid injection port 31 .
  • the first side 101 of the electrode assembly 10 and the second side 202 of the first casing 20 are disposed at a distance, and a liquid injection space is defined between the first side 101 and the second side 202 S.
  • the orthogonal projection of the liquid injection space S on the second casing 30 covers the second end portion 322 . Therefore, during liquid injection, the electrolyte flows along the first groove 32 to the second end 322 and can avoid the electrode assembly 10 and directly flow into the liquid injection space S, that is, the electrolyte is not hindered by the electrode assembly 10 during the liquid injection process. It can quickly flow into the liquid injection space, so that the electrolyte can infiltrate the pole pieces in the electrode assembly from the side, thereby further improving the infiltration efficiency.
  • the distance between the second end portion 322 and the edge of the second housing 30 is 1 mm to 3 mm.
  • the battery 100 further includes a first tab 50 electrically connected to the first pole piece 11 and a second tab 60 electrically connected to the second pole piece 12 .
  • the first casing 20 is provided with a through hole 21
  • the through hole 21 is provided with a pole 22 electrically isolated from the first casing 20 .
  • the first tab 50 is electrically connected to the first housing 20 .
  • the second tab 60 is electrically connected to the pole 22 .
  • the first pole piece 11 includes a first current collector 111 and a first active material layer 112 disposed on the surface of the first current collector 111
  • the first tab 50 can be electrically connected to the first current collector 111 by welding, and It is further electrically connected to the first casing 20
  • the second pole piece 12 includes a second current collector 121 and a second active material layer 122 disposed on the surface of the second current collector 121
  • the second tab 60 can be electrically connected to the second current collector 121 by welding, and further electrically connected on the pole 22.
  • the first tab 50 may also be electrically connected to the second housing 30 , which is not limited in this application.
  • the battery 100 can be electrically connected with external components of the electronic device.
  • the second side surface 202 includes an arc area 2021 and a plane area 2022 connecting the arc area 2021 , and the pole 22 is disposed in the plane area 2022 .
  • the present application disposes the poles 22 on the plane area 2022 of the first casing 20, which can avoid increasing the thickness of the battery 100 due to the poles 22, and also avoid the 22 results in occupying the space at the end of the battery 100 and reducing the number of pole piece layers, which is beneficial to improve the energy density of the battery 100 .
  • the battery 100 of the present application may be a lithium secondary battery, including a lithium metal secondary battery, a lithium ion secondary battery, a lithium polymer secondary battery, and a lithium ion polymer secondary battery.
  • the battery 100 may also be all kinds of primary batteries, secondary batteries, fuel cells, or solar cells.
  • the present application further provides an electronic device 1 , and the electronic device 1 includes the above-mentioned battery 100 .
  • the electronic device 1 of the present application may be, but is not limited to, a notebook computer, a pen input computer, a mobile computer, an e-book player, a portable phone, a portable fax machine, a portable copier, a portable printer, a headset stereo headphones, VCRs, LCD TVs, watches, sports bracelets, portable cleaners, portable CD players, mini CDs, transceivers, electronic notepads, calculators, memory cards, portable recorders, radios, backup power, motors, Automobiles, motorcycles, power-assisted bicycles, bicycles, lighting fixtures, toys, game consoles, power tools, flashlights and lithium-ion capacitors, etc.

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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)
  • Sealing Battery Cases Or Jackets (AREA)
  • Filling, Topping-Up Batteries (AREA)

Abstract

一种电池(100)，包括电极组件(10)、形成有收容槽的第一壳体(20)和覆盖所述收容槽的第二壳体(30)，所述电极组件容置于所述收容槽中。所述第二壳体(30)包括朝向所述电极组件(10)的第一表面(301)和与所述第一表面(301)相对的第二表面(302)。所述第二壳体(30)设有贯穿所述第一表面(301)和所述第二表面(302)的注液口(31)。所述第一表面(301)包括与所述注液口(31)连通的第一凹槽(32)。本申请还提供一种具有上述电池(100)的电子装置(1)。本申请可以提高注液效率和电解液的浸润效率。

Description

电池和具有所述电池的电子装置 技术领域
本申请涉及储能技术领域，尤其涉及一种电池和具有所述电池的电子装置。
背景技术
电池通常包括电极组件、用于容置电极组件的壳体和安装于壳体的顶盖。顶盖上通常设有注液口，电解液由注液口注入壳体内。然而，由于注液口位于电极组件上方，注液过程中电解液会受到电极组件的阻碍，使得注液效率降低，影响电解液对电极组件中极片的浸润效率。
发明内容
有鉴于此，有必要提供一种能够提高注液效率的电池，从而提高电解液对极片的浸润效率。
另外，还有必要提供一种具有如上电池的电子装置。
本申请提供一种电池，包括电极组件、形成有收容槽的第一壳体和覆盖所述收容槽的第二壳体，所述电极组件容置于所述收容槽中。所述第二壳体包括朝向所述电极组件的第一表面和与所述第一表面相对的第二表面。所述第二壳体设有贯穿所述第一表面和所述第二表面的注液口。所述第一表面包括与所述注液口连通的第一凹槽。
在一些可能的实现方式中，所述第一凹槽为多个，多个所述第一凹槽由所述注液口呈放射状分布。因此，第一壳体上可供电解液流动的通道增多，而且由注液口注入的电解液可向注液口四周流动，进一步增加电解液的流动性。
在一些可能的实现方式中，多个所述第一凹槽相对于所述注液口对称设置。因此，由注液口注入的电解液可均匀浸润电极组件的各个区域。
在一些可能的实现方式中，所述第一凹槽包括用于连通所述注液口的第一端部和与所述第一端部相对的第二端部，所述第一端部直接连通所述注液口。
在一些可能的实现方式中，所述第一表面还包括第二凹槽，所述第一端部通过所述第二凹槽连通所述注液口。当注液口处的注液速度较快时，第二凹槽可起到缓存作用，防止注入电解液过多时电解液由注液口溢出的情况。
在一些可能的实现方式中，所述电极组件包括第一侧面，所述第一壳体包括朝向所述第一侧面的第二侧面，所述第一侧面和所述第二侧面之间限定出注液空间，所述注液空间在所述第二壳体上的正交投影覆盖所述第二端部。因此在注液时，电解液沿第一凹槽流动至第二端部后可避开电极组件直接流入注液空间，即注液过程中电解液不受到电极组件的阻碍，可迅速流入位于电极组件侧面的注液空间，使得电解液可从侧面浸润电极组件中的极片，从而进一步提高浸润效率。
在一些可能的实现方式中，所述第二凹槽围绕所述注液口设置。
在一些可能的实现方式中，所述第二端部与所述第二壳体的边缘之间的距离为1毫米至3毫米。
在一些可能的实现方式中，第一凹槽未贯穿第二表面。
在一些可能的实现方式中，第一凹槽的数量为8个，两相邻第一凹槽的延伸方向之间的夹角均为45°。
在一些可能的实现方式中，所述电极组件包括第一极片、隔离膜和第二极片。所述电池还包括电连接于所述第一极片的第一极耳和电连接于所述第二极片的第二极耳。所述第一壳体设有极柱，所述极柱与所述第一壳体之间电性隔绝。所述第一极耳电连接于所述第一壳体或所述第二壳体。所述第二极耳电连接于所述极柱。
在一些可能的实现方式中，所述电极组件包括第一侧面。所述第一壳体包括朝向所述第一侧面的第二侧面。所述第二侧面包括弧面区域和平面区域，所述极柱设置于所述平面区域。本申请将极柱设置于第一壳体的平面区域，可避免因极柱而增加电池的厚度，还可避免因极柱导致占用电池端部的空间而导致极片层数减少，因此有利于提高电池的能量密度。
在一些可能的实现方式中，所述注液口位于所述第二壳体的几何中心处。
在一些可能的实现方式中，所述电池还包括密封件，所述密封件密封所述注液口。
本申请还提供一种电子装置，包括如上电池。
本申请在第二壳体上设置与注液口连通的第一凹槽，在电解液由注液口注入时，电解液可沿第一凹槽流动，使得电解液流动性提高，从而充分浸润电极组件的极片。因此，本申请能够提高注液效率，从而提高电解液对极片的浸润效率。再者，本申请不需为了在注液过程中避开电极组件而将注液口设置于与第二壳体的边缘距离较近的位置，即注液口可灵活设置于第二壳体上，从而避免了注液口与第二壳体的边缘距离较近导致后续焊接时第二壳体发生二次熔边。
附图说明
图1为本申请一实施方式的电池的整体结构示意图。
图2为图1所示的电池于一些实施例中沿II-II的剖视图。
图3为图1所示的电池的第二壳体于一些实施例中的结构示意图。
图4为图1所示的电池的第二壳体于另一些实施例中的结构示意图。
图5为图1所示的电池于另一些实施例中沿II-II的剖视图。
图6为本申请一实施方式的电子装置的结构示意图。
主要元件符号说明
电子装置         1
电极组件         10
第一极片         11
第二极片         12
第一壳体         20
通孔             21
极柱             22
第二壳体         30
注液口           31
第一凹槽         32
第二凹槽         33
绝缘件           40
第一极耳         50
第二极耳         60
电池             100
第一侧面         101
第一集流体       111
第一活性材料层   112
第二集流体       121
第二活性材料层   122
底面             201
第二侧面         202
第一表面         301
第二表面         302
密封件           310
第一端部         321
第二端部         322
弧面区域         2021
平面区域         2022
注液空间         S
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。
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和图2，本申请一实施方式提供一种电池100，包括电极组件10、形成有收容槽的第一壳体20和覆盖收容槽的第二壳体30，电极组件10容置于收容槽中。电极组件10包括第一极片11、第二极片12以及设置于第一极片11和第二极片12之间的隔离膜(图未示)。隔离膜用于防止第一极片11和第二极片12直接接触，从而防止电极组件10短路。在一些实施方式中，电极组件10为叠片结构，即，第一极片11、隔离膜和第二极片12依次层叠以形成电极组件10。电极组件10包括第一侧面101。
在另一些实施例中，电极组件10还可以为卷绕结构，即，第一极片11、隔离膜和第二极片12依次层叠并卷绕以形成电极组件10，本申请并不作限制。
第一壳体20包括底面201和围绕底面201的周缘设置的第二侧面202，第二侧面202朝向第一侧面101。第二底面201和第二侧面202共同限定出用于容置电极组件10的收容 槽(图未标出)。
第二壳体30安装于第二侧面202远离底面201的一侧，且覆盖容置电极组件10的收容槽。第二壳体30可大致为平板结构，包括朝向电极组件10的第一表面301和与第一表面301相对的第二表面302。第二壳体30设有贯穿第一表面301和第二表面302的注液口31，电解液可由注液口31注入收容槽内部。其中，注液口31可以为几何对称形状，例如圆形、椭圆形、正方形、六边形等，注液口31可以采用冲压或机械切割等方式形成。
其中，第一壳体20和第二壳体30的材质可以为金属。如，第一壳体20和第二壳体30的材质可以为钢合金、铝合金、铁合金、铜合金、镍合金等。制备时，第一壳体20和第二壳体30可以采用激光切割、机床加工等工艺形成所需的形状。其中，第一壳体20还可以采用冲压成型形成收容槽，从而容置电极组件10。然后，第二壳体30可采用焊接的方式安装于第一壳体20，从而将电极组件10封装于所述收容槽内。
请同时参照图3，第一表面301包括与注液口31连通的第一凹槽32，第一凹槽32未贯穿第二表面302。在电解液由注液口31注入时，电解液可沿第一凹槽32流动。
在一些实施例中，注液口31中设有密封件310。在注液完成后，通过密封件310密封注液口31，避免注入的电解液漏出或避免外界杂质进入电池100内部。其中，密封件310可以是采用可焊接材质(如不锈钢或铝合金)制得的密封钉，密封钉插入注液口31后，通过激光焊接方式使得密封钉与第二壳体30固定在一起。如此，可以提高注液口31的密封可靠性。
本申请在第二壳体30的第一表面301上设置与注液口31连通的第一凹槽32，在电解液由注液口31注入时，电解液可沿第一凹槽32流动，使得电解液流动性提高，从而充分浸润电极组件10的极片。因此，本申请能够提高注液效率，从而提高电解液对极片的浸润效率。
再者，若为了在注液过程中避开电极组件重新布局注液口的位置，当注液口与第二壳体的边缘距离较近时，后续当焊接密封钉与第二壳体以及焊接第二壳体与第一壳体时，焊接位置互相干涉导致第二壳体发生二次熔边的风险。本申请不需为了在注液过程中避开电极组件而将注液口31设置于与第二壳体30的边缘距离较近的位置，即注液口可以灵活设置于第二壳体上，从而避免了注液口31与第二壳体30的边缘距离较近导致后续焊接时第二壳体发生二次熔边。
因此，在一些实施例中，注液口31位于第二壳体30的几何中心处。
如图5所示，在另一些实施例中，电极组件10和第二壳体30的第一表面301之间可 设有绝缘件40。当第二壳体30为金属材质时，绝缘件40用于电性隔绝电极组件10与第二壳体30。绝缘件40还与第一表面301贴合，从而在第二壳体30处形成供电解液流动的通道。其中，绝缘件40的材质包括聚丙烯(PP)、聚对苯二甲酸乙二醇酯(PET)、聚苯乙烯(PS)、聚酰亚胺(PI)、尼龙或铁氟龙(PTFE)中的至少一种。绝缘件40可以是单层结构，也可以是多层复合结构。
如图3所示，在一些实施例中，第一凹槽32为多个，且多个第一凹槽32由注液口31呈放射状分布。因此，第一壳体20上可供电解液流动的通道增多，而且，由于多个第一凹槽32由注液口31呈放射状分布，因此由注液口31注入的电解液可向注液口31四周流动，进一步增加电解液的流动性。
在一些实施例中，多个第一凹槽32相对于注液口31对称设置。因此，由注液口31注入的电解液可均匀浸润电极组件10的各个区域。八个第一凹槽32由注液口31呈放射状分布，每相邻两个第一凹槽32的延伸方向之间的夹角相同，均为45度。在其它实施例中，第一凹槽32的数量和相邻第一凹槽32的夹角的具体数值还可以不同，本申请并不作限制。
其中，第一凹槽32可以设置为直线型，具体地，第一凹槽32包括用于连通注液口31的第一端部321和与第一端部321相对的第二端部322。在一些实施例中，第一端部321直接连通注液口31。在这种情况下，由注液口31注入的电解液直接进入第一端部321并沿第一凹槽32流动。
请参阅图4，在另一些实施例中，第一表面301还包括第二凹槽33，第一端部321通过第二凹槽33连通注液口31。例如，如图所示，第二凹槽33可围绕注液口31设置，第一端部321直接连通第二凹槽33的外侧。如此，由注液口31注入的电解液先流经第二凹槽33，然后再进入第一端部321并沿第一凹槽32流动。在这种情况下，当注液口31处的注液速度较快时，第二凹槽33可起到缓存作用，防止注入电解液过多时电解液由注液口31溢出的情况。
在其它实施例中，部分第一凹槽32的第一端部321直接连通注液口31，另一部分第一凹槽32的第一端部321通过第二凹槽33连通注液口31。此时，第二凹槽33仅围绕部分注液口31设置。
如图2所示，在一些实施例中，电极组件10的第一侧面101和第一壳体20的第二侧面202相距设置，第一侧面101和第二侧面202之间限定出注液空间S。注液空间S在第二壳体30上的正交投影覆盖第二端部322。因此在注液时，电解液沿第一凹槽32流动至 第二端部322后可避开电极组件10直接流入注液空间S，即注液过程中电解液不受到电极组件10的阻碍，可迅速流入注液空间，使得电解液可从侧面浸润电极组件中的极片，从而进一步提高浸润效率。
进一步地，第二端部322与第二壳体30的边缘之间的距离为1毫米至3毫米。
如图2所示，在一些实施例中，电池100还包括电连接于第一极片11的第一极耳50和电连接于第二极片12的第二极耳60。第一壳体20设有通孔21，通孔21中设有与第一壳体20之间电性隔绝的极柱22。第一极耳50电连接于第一壳体20。第二极耳60电连接于极柱22。
具体地，第一极片11包括第一集流体111和设置于第一集流体111表面的第一活性材料层112，第一极耳50可通过焊接方式电连接于第一集流体111，并进一步电连接于第一壳体20。第二极片12包括第二集流体121和设置于第二集流体121表面的第二活性材料层122，第二极耳60可通过焊接方式电连接于第二集流体121，并进一步电连接于极柱22。在其它实施例中，第一极耳50也可以电连接于第二壳体30，本申请并不作限制。
通过将第一极耳50电连接于第一壳体20或第二壳体30，第一壳体20或第二壳体30可呈现与第一极片11相同的电极性。通过将第二极耳60电连接于极柱22，极柱22可呈现与第二极片12相同的电极性。因此电池100可与电子装置外部元件电连接。
请同时参照图1和图2，在一些实施例中，第二侧面202包括弧面区域2021和连接弧面区域2021的平面区域2022，极柱22设置于平面区域2022。相较于将极柱设置于第二壳体，本申请将极柱22设置于第一壳体20的平面区域2022，可避免因极柱22而增加电池100的厚度，还可避免因极柱22导致占用电池100端部的空间而导致极片层数减少，因此有利于提高电池100的能量密度。
本申请的电池100可以是锂二次电池，包括锂金属二次电池、锂离子二次电池、锂聚合物二次电池和锂离子聚合物二次电池。在其它实施方式中，电池100也可以是所有种类的一次电池、二次电池、燃料电池或太阳能电池。
请参阅图6，本申请还提供一种电子装置1，电子装置1包括如上电池100。在一实施方式中，本申请的电子装置1可以是，但不限于，笔记本电脑、笔输入型计算机、移动电脑、电子书播放器、便携式电话、便携式传真机、便携式复印机、便携式打印机、头戴式立体声耳机、录像机、液晶电视、手表、运动手环、手提式清洁器、便携CD机、迷你光盘、收发机、电子记事本、计算器、存储卡、便携式录音机、收音机、备用电源、电机、汽车、摩托车、助力自行车、自行车、照明器具、玩具、游戏机、电动工具、闪光灯和锂 离子电容器等。
以上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，包括电极组件、形成有收容槽的第一壳体和覆盖所述收容槽的第二壳体，所述电极组件容置于所述收容槽中，其特征在于，
    所述第二壳体包括朝向所述电极组件的第一表面和与所述第一表面相对的第二表面，所述第二壳体设有贯穿所述第一表面和所述第二表面的注液口，所述第一表面包括与所述注液口连通的第一凹槽。
  2. 如权利要求1所述的电池，其特征在于，所述第一凹槽为多个，多个所述第一凹槽由所述注液口呈放射状分布。
  3. 如权利要求2所述的电池，其特征在于，多个所述第一凹槽相对于所述注液口对称设置。
  4. 如权利要求1所述的电池，其特征在于，所述第一凹槽包括用于连通所述注液口的第一端部和与所述第一端部相对的第二端部，所述电池满足以下条件的至少一者：
    a)所述第一端部直接连通所述注液口；
    b)所述第一表面还包括第二凹槽，所述第一端部通过所述第二凹槽连通所述注液口。
  5. 如权利要求4所述的电池，其特征在于，所述第二凹槽围绕所述注液口设置。
  6. 如权利要求4所述的电池，其特征在于，所述电极组件包括第一侧面，所述第一壳体包括朝向所述第一侧面的第二侧面，所述第一侧面和所述第二侧面之间限定出注液空间，所述注液空间在所述第二壳体上的正交投影覆盖所述第二端部。
  7. 如权利要求4所述的电池，其特征在于，所述第二端部与所述第二壳体的边缘之间的距离为1毫米至3毫米。
  8. 如权利要求1所述的电池，其特征在于，所述电极组件包括第一极片、隔离膜和第二极片，所述电池还包括电连接于所述第一极片的第一极耳和电连接于所述第二极片的第二极耳；
    所述第一壳体设有极柱，所述极柱与所述第一壳体之间电性隔绝，所述第一极耳电连接于所述第一壳体或所述第二壳体，所述第二极耳电连接于所述极柱。
  9. 如权利要求8所述的电池，其特征在于，所述电极组件包括第一侧面，所述第一壳体包括朝向所述第一侧面的第二侧面，所述第二侧面包括弧面区域和平面区域，所述极柱设置于所述平面区域。
  10. 如权利要求1所述的电池，其特征在于，所述注液口位于所述第二壳体的几何中 心处。
  11. 如权利要求1所述的电池，其特征在于，所述电池还包括密封件，所述密封件密封所述注液口。
  12. 一种电子装置，其特征在于，包括如权利要求1至11中任一项所述的电池。
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CN208284511U (zh) * 2018-05-22 2018-12-25 东莞塔菲尔新能源科技有限公司 一种动力电池顶盖装配结构

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