WO2019080394A1 - 新型扣式锂离子电池及其壳体 - Google Patents

新型扣式锂离子电池及其壳体

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Publication number
WO2019080394A1
WO2019080394A1 PCT/CN2018/074369 CN2018074369W WO2019080394A1 WO 2019080394 A1 WO2019080394 A1 WO 2019080394A1 CN 2018074369 W CN2018074369 W CN 2018074369W WO 2019080394 A1 WO2019080394 A1 WO 2019080394A1
Authority
WO
WIPO (PCT)
Prior art keywords
electrode
insulating rubber
lithium ion
ion battery
annular wall
Prior art date
Application number
PCT/CN2018/074369
Other languages
English (en)
French (fr)
Inventor
周晓玲
何安轩
Original Assignee
深圳市能锐创新科技有限公司
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 深圳市能锐创新科技有限公司 filed Critical 深圳市能锐创新科技有限公司
Publication of WO2019080394A1 publication Critical patent/WO2019080394A1/zh

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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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion 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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/109—Primary casings; Jackets or wrappings characterised by their shape or physical structure of button or coin shape
    • 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 invention relates to the field of lithium ion batteries, in particular to a novel button type lithium ion battery and a casing thereof.
  • the button cell is also called a button battery. It refers to a battery with a small size like a small button. Generally speaking, the thickness is thin (relative to a cylindrical battery such as the AA battery on the market).
  • the button battery is divided into the battery from the shape, and the corresponding battery is classified into a column battery, a square battery, and a shaped battery.
  • the appearance of the button battery is made of stainless steel and is used as the positive electrode.
  • the negative electrode is a stainless steel circular cover.
  • the positive and negative electrodes are insulated by a sealing ring.
  • the sealing ring is made of PP or PET.
  • the sealing ring can be insulated. Prevent electrolyte leakage.
  • buttons batteries are used in smart wearable products, such as earphones, etc., and improving the capacity of the button battery is a major problem that needs to be solved at present.
  • One of the objects of the embodiments of the present invention is to provide a novel button type lithium ion battery and a casing thereof, which is advantageous for improving the capacity of the button battery.
  • a novel button-type lithium ion battery includes: a first electrode shell and a second electrode shell,
  • the first electrode housing comprises a first electrode end cap made of metal and a first annular wall body
  • the outer surface of the first annular wall is completely covered with an insulating rubber layer, and the insulating rubber layer is an integrated structure;
  • the second electrode housing includes a second electrode end cap made of metal, and a second annular wall body,
  • the first annular wall body and the second annular wall are nested inside and outside the inner wall, the first electrode end cover is opposite to the second electrode end cover, and the insulating rubber layer is spaced apart from the first electrode shell and the second Between the contact points between the electrode shells,
  • An electric core body is disposed in the casing formed by the first electrode shell and the second electrode shell, and the first electrode end cap is electrically connected to one of a positive electrode and a negative electrode of the electric core body, and the second The electrode end cap is electrically connected to the other of the positive electrode and the negative electrode of the battery body.
  • a through hole is formed in the first annular wall body
  • the insulating layer is also filled in each of the through holes.
  • the through hole edge is smooth.
  • the via is formed using an etching process.
  • the through hole has a diameter of 0.1 to 1 mm and an error of ⁇ 0.03 mm.
  • the insulating rubber layer is formed on the outside of the first annular wall by injection molding.
  • the insulating rubber layer and the second electrode shell outside the first electrode shell are connected to each other by an interference fit.
  • a plane slope is formed on the outer wall of the insulating rubber layer in contact with the second electrode shell, and the slope is consistent with the direction in which the second electrode shell is sleeved.
  • the thickness of the insulating layer is linearly thicker toward the direction of the first electrode end cap.
  • an insulating rubber ring is interposed between the first electrode shell and the second electrode shell.
  • the insulating rubber ring is elastically deformed under the pressing of the first electrode shell and the second electrode shell.
  • the insulating rubber ring is integrated with the insulating rubber layer and protruded on an outer wall of the insulating rubber layer.
  • the insulating rubber ring is independent of the insulating rubber layer and is sleeved on an outer wall of the insulating rubber layer.
  • first annular wall body and the second annular wall body are all straight and have no curling shape.
  • the first electrode end cover and the first annular wall body are an integrated structure.
  • the second electrode end cover and the second annular wall body are an integrated structure.
  • first annular wall body and/or the second annular wall body have a wall thickness of (0.2 ⁇ 0.03) mm.
  • the first electrode end cap and/or the second electrode end cap have a thickness of (0.2 ⁇ 0.03) mm.
  • a casing for a button-type lithium ion battery includes: a first electrode shell and a second electrode shell.
  • the first electrode housing comprises a first electrode end cap made of metal and a first annular wall body
  • a through hole penetrating through is disposed on the first annular wall body, an outer surface of the first annular wall is completely covered with an insulating rubber layer, and the insulating rubber layer fills each of the through holes, and the insulating layer
  • the glue layer is an integrated structure;
  • the second electrode case includes a second electrode end cover made of metal, and a second annular wall body,
  • the first annular wall body and the second annular wall are nested inside and outside the inner wall, the first electrode end cover is opposite to the second electrode end cover, and the insulating rubber layer is spaced apart from the first electrode shell and the second Between the contact points between the electrode shells.
  • the through hole edge is smooth.
  • the via is formed using an etching process.
  • the through hole has a diameter of 0.1 to 1 mm and an error of ⁇ 0.03 mm.
  • the insulating rubber layer is formed on the outside of the first annular wall by injection molding.
  • the insulating rubber layer and the second electrode shell outside the first electrode shell are connected to each other by an interference fit.
  • a plane slope is formed on the outer wall of the insulating rubber layer in contact with the second electrode shell, and the slope is consistent with the direction in which the second electrode shell is sleeved.
  • the thickness of the insulating layer is linearly thicker toward the direction of the first electrode end cap.
  • an insulating rubber ring is interposed between the first electrode shell and the second electrode shell.
  • the insulating rubber ring is elastically deformed under the pressing of the first electrode shell and the second electrode shell.
  • the insulating rubber ring is integrated with the insulating rubber layer and protruded on an outer wall of the insulating rubber layer.
  • the insulating rubber ring is independent of the insulating rubber layer and is sleeved on an outer wall of the insulating rubber layer.
  • first annular wall body and the second annular wall body are all straight and have no curling shape.
  • the first electrode end cover and the first annular wall body are an integrated structure.
  • the second electrode end cover and the second annular wall body are an integrated structure.
  • first annular wall body and/or the second annular wall body have a wall thickness of (0.2 ⁇ 0.03) mm.
  • the first electrode end cap and/or the second electrode end cap have a thickness of (0.2 ⁇ 0.03) mm.
  • the first electrode shell is a positive electrode
  • the second electrode shell is a negative electrode
  • the integrated insulating rubber layer is completely tightly wrapped on the outer surface of the first annular wall, which is compared with the prior art.
  • the structure is beneficial for reducing the thickness of the first electrode shell and the second electrode shell and the interval therebetween, and is beneficial to increasing the button type lithium ion battery, and improving the capacity of the button battery based on the predetermined lithium ion battery specifications.
  • FIG. 1 is a schematic perspective structural view of a battery case assembly of a button battery according to an embodiment of the present invention
  • Figure 2 is a schematic front view of Figure 1;
  • Figure 3 is a top plan view of Figure 1;
  • Figure 4 is a schematic cross-sectional view of the A-A of Figure 3;
  • FIG. 5 is a schematic structural view of the first electrode shell and the insulating rubber layer of FIG. 4; FIG.
  • FIG. 6 is a schematic perspective view showing a second electrode shell of the battery case of FIG. 1;
  • Figure 7 is a top plan view of the structure of Figure 6;
  • Figure 8 is a top plan view of Figure 6;
  • Figure 9 is a schematic cross-sectional view of the B-B of Figure 6;
  • Figure 10 is a perspective view showing the structure of the metal base of the first electrode case in the battery case of Figure 1;
  • Figure 11 is a front cross-sectional structural view of Figure 8.
  • Figure 12 is a top plan view of Figure 8.
  • 101 a first electrode shell; 102: first electrode end cap
  • 201 a second electrode shell
  • 202 a second electrode end cap
  • 203 a second annular wall body; 301: Insulating rubber layer.
  • This embodiment provides a novel button-type lithium ion battery structure, which can improve the battery core accommodation of the button battery in a predetermined button battery specification.
  • the button lithium-ion battery structure includes: a housing composed of a first electrode shell 101 and a second electrode shell 201, and a battery core packaged in the housing, wherein the battery core body may be a laminated battery core or Winding the core body.
  • the first electrode shell 101 and the second electrode shell 201 are all metal shells, and the first electrode shell 101 and the second electrode shell 201 are sleeved together, so that the positive and negative end caps are opposite. .
  • the first electrode shell 101 and the second electrode shell 201 are both metal materials having a thickness of about 2.0 to 2.5 mm, and a bead is provided at the edge of the first electrode shell 101 or the second electrode shell 201.
  • An annular insulating rubber ring thicker than the bead is disposed on the bead, so that the annular insulating rubber ring is interspersed between the first electrode shell 101 and the second electrode shell 201.
  • the first electrode shell 101 includes a first electrode end cap 102 made of metal, and a first annular wall body 103 made of metal, completely covered on the outside of the first annular wall body 103.
  • An integrated insulating layer 301 In the present embodiment, it is preferable, but not limited to, to provide the insulating glue on the inner wall, the outer wall, and the end end surface of the first annular wall body 103 by an injection molding process.
  • the second electrode case 201 includes a second electrode end cap 202 made of metal, and a second annular wall body 203 made of metal.
  • the first annular wall body 103 and the second annular wall body 203 are nested inside and outside, the first electrode end cover 102 is opposite to the second electrode end cover 202, and the insulating glue layer 301 is spaced apart from the first electrode shell 101 as shown in FIG. Between the contact portions between the second electrode shells 201.
  • the thicknesses of the first electrode shell 101 and the second electrode shell 201 are both made thin, and the thickness is about (0.15 ⁇ 0.03) mm, which is disposed on the first annular wall body 103.
  • the structure is adopted to reduce the structure compared with the prior art.
  • the thickness of the first electrode shell 101 and the second electrode shell 201 and the interval therebetween are advantageous for increasing the button type lithium ion battery, and improving the capacity of the button battery based on the predetermined lithium ion battery specifications.
  • first annular wall body 103 and the second annular wall body 203 of the first electrode shell 101 and the second electrode shell 201 are arranged in a straight shape by using the technical solution of the embodiment, and there is no need to provide a curling edge, which is advantageous for increasing The inner cavity of the large housing.
  • a through hole 104 is formed in the metal base shell of the first electrode shell 101, so that the wrapped insulating rubber layer 301 is embedded in the through hole 104, so that the insulating rubber layer 301 is firmly integrated with the metal base shell, and the metal base is The shell is wrapped around its surface.
  • the use of the through hole 104 is advantageous for further improving the tightness of the bonding of the covered insulating rubber layer 301 and the first electrode shell 101, which is advantageous for making the insulating adhesive layer 301 thinner, thereby increasing the inner cavity space of the casing. .
  • the present embodiment adopts a film of an insulating adhesive layer 301 integrally formed on the outer periphery of the first electrode shell 101 and integrated with the first electrode shell 101 through the through hole 104, and the insulating rubber layer 301 is used.
  • the structure on the one hand, ensures the insulation isolation of the positive and negative electrodes of the shell, and on the other hand, compensates for the thin design of the first electrode shell 101 and enhances the strength of the shell.
  • the through hole 104 referred to in the metal base case of the first electrode shell 101 may be formed by an etching process, and the through hole 104 has a diameter of 0.1 mm to 1 mm to make the through hole 104 uniform. Distributed on the metal base shell.
  • the through hole 104 in the first annular wall 103 of the first electrode shell 101 with a smooth edge-free burr shape, which is advantageous for reducing the short circuit rate of the battery body.
  • the insulating layer 301 may be wrapped on the surface of the first electrode shell 101 by means of injection molding, wherein the thickness of the insulating layer 301 on the surface of the first electrode shell 101 is set to 0.1 ⁇ 0.3 mm, the injection molding process can ensure that the insulating adhesive layer 301 can be uniformly injected into the through hole 104, and the uniformity of the insulating adhesive layer 301 on the surface of the metal base layer is improved, which is advantageous for forming the ultra-thin insulating adhesive layer 301.
  • the insulating adhesive layer 301 is interference-fitted between the first annular wall body 103 and the second annular wall body 203.
  • a slope along the insulating layer 301 of the outer wall of the first electrode shell 101 is provided, so that the thickness of the insulating layer 301 on the slope is closer to the first motor end cover 102.
  • the interference strength thereof is increased from small to large, and the slope arrangement is used to enhance the tightness of the first electrode shell 101 and the second electrode shell 201.
  • the solidity facilitates the socket connection between the first electrode shell 101 and the second electrode shell 201, so that the socket is more labor-saving and simple.
  • an interference fit insulating rubber ring (not shown) may be disposed between the first electrode shell 101 and the second electrode shell 201 to make an insulating rubber ring in the first electrode shell. 101.
  • the second electrode case 201 is in an elastic deformation state under the pressing, and the insulating rubber ring is disposed at an interval of interference fit to further improve the fastening property between the first electrode case 101 and the second electrode case 201.
  • the insulating rubber ring may be a ring extending on the outer periphery of the insulating rubber layer 301; or may be an annular rubber ring that is independent of the insulating rubber layer 301 and is sleeved on the outer periphery of the insulating rubber layer 301.
  • the first electrode shell 101 of the present embodiment is a negative electrode
  • the second electrode shell 201 is a positive electrode
  • the button lithium-ion battery structure comprises: a housing and a battery core packaged in the metal housing, wherein the battery core body may be a laminated battery core body or a wound battery core body.
  • the housing includes a first electrode shell electrically connected to the negative electrode sheet of the electric core body, the positive electrode sheet, a second electrode shell, and an insulating rubber ring spaced between the first electrode shell and the second electrode shell.
  • the material thickness of the first electrode shell and the second electrode shell is 0.1 to 0.15 mm, and the thickness of the insulating apron is 0.08 to 0.1 mm.
  • a lithium ion battery body is placed between the first electrode case and the second electrode case, and the capacity of the lithium ion carrier is maximized.
  • the metal base shell of the first electrode shell has an annular flat shape with no curling on both sides, and the thickness of the metal base shell is 0.15 mm.
  • the surface of the metal base shell is completely covered with an insulating rubber layer by an injection molding process, and the thickness of the insulating rubber layer is 0.2. In millimeters, the entire insulating layer is an integrated structure.
  • the second electrode shell is also a flat, non-crimped metal base shell having a thickness of 0.15 mm.
  • a battery body is placed between the first electrode case and the second electrode case, and the capacity of the lithium ion carrier is maximized.
  • the preparation process and equipment of the electric core body are the same as those of the comparative example.
  • Embodiment 1 differs from Embodiment 1 in that:
  • the surface of the metal base shell of the first electrode shell is further formed with a uniformly distributed through hole by a etching process, and the through hole has a diameter of 0.6 to 1 mm, and the insulating layer completely wrapped around the metal base shell is injected and solidified in each through hole. , combined with the metal base shell.
  • the thickness of the insulating layer of this embodiment is 0.1 mm.
  • the structure and dimensions of the second electrode shell were the same as in Example 1.
  • a battery body is placed between the first electrode case and the second electrode case, and the capacity of the lithium ion carrier is maximized.
  • the preparation process and equipment of the electric core body are the same as those of the comparative example and the embodiment.
  • annular metal base shell of the present embodiment is illustrated by a circular ring shape, and is not limited to a circular ring shape, and may also be a square ring shape or a ring shape of other shapes.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Secondary Cells (AREA)
  • Primary Cells (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

新型扣式锂离子电池及其壳体，电池包括：第一电极壳、第二电极壳，第一电极壳包括，位于由金属制成的第一电极端盖、以及第一环形壁体，在第一环形壁体外，完全包覆有绝缘胶层，绝缘胶层为一体化结构；第二电极壳包括，由金属制成的第二电极端盖、以及第二环形壁体，第一环形壁体、第二环形壁体内外相嵌套，第一电极端盖与第二电极端盖相对，绝缘胶层间隔在第一电极壳、第二电极壳之间的接触部位之间，在第一电极壳、第二电极壳构成的壳体内设置有电芯体。采用该方案有利于提高扣式电池的容量。

Description

新型扣式锂离子电池及其壳体 技术领域
本发明涉及锂离子电池领域，尤其涉及一种新型扣式锂离子电池及其壳体。
 背景技术
纽扣电池（button cell ）也称扣式电池，是指外形尺寸象一颗小纽扣的电池，一般来说厚度较薄（相对于柱状电池如市场上的5号AA等电池）。纽扣电池是从外形上来对电池来分，同等对应的电池分类有柱状电池、方形电池、异形电池。
扣式电池的外表为不锈钢材料，并作为正极，其负极为不锈钢的圆形盖，正极与负极间有密封环绝缘，密封环用PP或PET制成，密封环除起绝缘作用外，还能阻止电解液泄漏。
随着智能穿戴产品的应用越来越广泛，人们对于小体积的锂离子二次可充电电池的需求也越来越广。故而扣式电池越来越多的应用于智能穿戴产品，比如耳机等，提高扣式电池的容量是目前需要解决的一大课题。
 技术问题
本发明实施例的目的之一在于提供一种新型扣式锂离子电池及其壳体，采用该结构有利于提高扣式电池的容量。
 技术解决方案
第一方面，本发明实施例提供的一种新型扣式锂离子电池，其包括：第一电极壳、第二电极壳，
其中所述第一电极壳包括，位于由金属制成的第一电极端盖、以及第一环形壁体，
在所述第一环形壁体外，完全包覆有绝缘胶层，所述绝缘胶层为一体化结构；
所述第二电极壳包括，由金属制成的第二电极端盖、以及第二环形壁体，
所述第一环形壁体、第二环形壁体内外相嵌套，所述第一电极端盖与所述第二电极端盖相对，所述绝缘胶层间隔在所述第一电极壳、第二电极壳之间的接触部位之间，
在所述第一电极壳、第二电极壳构成的壳体内设置有电芯体，所述第一电极端盖与所述电芯体的正极、负极的其中之一电连接，所述第二电极端盖与所述电芯体的正极、负极的另一电连接。
可选地，在所述第一环形壁体上还排布有贯穿的通孔，
在各所述通孔内还充满有所述绝缘胶层。
可选地，所述通孔边缘光滑。
可选地，所述通孔采用蚀刻工艺形成。
可选地，所述通孔的直径为0.1~1mm,误差为±0.03毫米。
可选地，所述绝缘胶层通过注塑固化形成在所述第一环形壁体外。
可选地，所述第一电极壳外的所述绝缘胶层、第二电极壳相互过盈配合嵌套连接。
可选地，在所述绝缘胶层与所述第二电极壳相接触的外壁，设置有一坡度与所述第二电极壳套接方向相一致的平面斜坡，在所述平面斜坡部位，所述绝缘胶层往靠近所述第一电极端盖方向的厚度线性变厚。
可选地，在所述第一电极壳、第二电极壳之间还过盈间隔有绝缘胶环，
所述绝缘胶环在所述第一电极壳、第二电极壳挤压下呈弹性形变状态。
可选地，所述绝缘胶环与所述绝缘胶层为一体，凸起在所述绝缘胶层的外壁。
可选地，所述绝缘胶环与所述绝缘胶层相独立，套接在所述绝缘胶层的外壁。
可选地，所述第一环形壁体、第二环形壁体均为平直无卷边状。
可选地，所述第一电极端盖、以及第一环形壁体为一体化结构。
可选地，所述第二电极端盖、以及第二环形壁体为一体化结构。
可选地，所述第一环形壁体、和/或第二环形壁体的壁厚为（0.2±0.03）毫米。
可选地，所述第一电极端盖、和/或第二电极端盖的厚度为（0.2±0.03）毫米。
第二方面，本发明实施例提供的新型扣式锂离子电池用壳体，其包括：第一电极壳、第二电极壳，
其中所述第一电极壳包括，位于由金属制成的第一电极端盖、以及第一环形壁体，
在所述第一环形壁体上还排布有贯穿的通孔，在所述第一环形壁体外完全包覆有绝缘胶层，并且所述绝缘胶层充满各所述通孔，所述绝缘胶层为一体化结构；所述第二电极壳包括，由金属制成的第二电极端盖、以及第二环形壁体，
所述第一环形壁体、第二环形壁体内外相嵌套，所述第一电极端盖与所述第二电极端盖相对，所述绝缘胶层间隔在所述第一电极壳、第二电极壳之间的接触部位之间。
可选地，所述通孔边缘光滑。
可选地，所述通孔采用蚀刻工艺形成。
可选地，所述通孔的直径为0.1~1mm,误差为±0.03毫米。
可选地，所述绝缘胶层通过注塑固化形成在所述第一环形壁体外。
可选地，所述第一电极壳外的所述绝缘胶层、第二电极壳相互过盈配合嵌套连接。
可选地，在所述绝缘胶层与所述第二电极壳相接触的外壁，设置有一坡度与所述第二电极壳套接方向相一致的平面斜坡，在所述平面斜坡部位，所述绝缘胶层往靠近所述第一电极端盖方向的厚度线性变厚。
可选地，在所述第一电极壳、第二电极壳之间还过盈间隔有绝缘胶环，
所述绝缘胶环在所述第一电极壳、第二电极壳挤压下呈弹性形变状态。
可选地，所述绝缘胶环与所述绝缘胶层为一体，凸起在所述绝缘胶层的外壁。
可选地，所述绝缘胶环与所述绝缘胶层相独立，套接在所述绝缘胶层的外壁。
可选地，所述第一环形壁体、第二环形壁体均为平直无卷边状。
可选地，所述第一电极端盖、以及第一环形壁体为一体化结构。
可选地，所述第二电极端盖、以及第二环形壁体为一体化结构。
可选地，所述第一环形壁体、和/或第二环形壁体的壁厚为（0.2±0.03）毫米。
可选地，所述第一电极端盖、和/或第二电极端盖的厚度为（0.2±0.03）毫米。
可选地，所述第一电极壳为正极，所述第二电极壳为负极。
 
 有益效果
由上可见，采用本发明实施例技术方案，在本实施例的扣式锂离子电池中，由于在第一环形壁体外完全紧密包裹有一体化的绝缘胶层，相对于现有技术，采用该结构，有利于降低第一电极壳、第二电极壳的厚度及其之间的间隔，有利于增大扣式锂离子电池，在既定锂离子电池规格基础上，提高扣式电池的容量。
 附图说明
此处所说明的附图用来提供对本发明的进一步理解，构成本申请的一部分，并不构成对本发明的不当限定，在附图中：
图1为本发明实施例提供的一种扣式电池的电池壳组装立体透视结构示意图；
图2为图1的主视结构示意图；
图3为图1的俯视结构示意图；
图4为图3的A-A剖面结构示意图；
图5为图4中的第一电极壳与绝缘胶层的结构示意图；
图6为图1电池壳中的第二电极壳立体结构示意图；
图7为图6的俯视主视结构示意图；
图8为图6的俯视结构示意图；
图9为图6的B-B剖面结构示意图；
图10为图1电池壳中的第一电极壳的金属基壳的立体结构示意图；
图11为图8的主视剖面结构示意图；
图12为图8的俯视结构示意图。
附图标记：
101：第一电极壳；            102：第一电极端盖
103：第一环形壁体；         104通孔
201：第二电极壳；            202：第二电极端盖；
203：第二环形壁体；           301：绝缘胶层。
 本发明的实施方式
下面将结合附图以及具体实施例来详细说明本发明，在此本发明的示意性实施例以及说明用来解释本发明，但并不作为对本发明的限定。
参见图1~12所示。
本实施例提供了一种新型扣式锂离子电池结构，采用该结构可以在预定的扣式电池规格提高扣式电池的电芯体容置。
本扣式锂离子电池结构包括：由第一电极壳101、第二电极壳201构成的壳体、以及封装在该壳体内的电芯体，其中该电芯体可以为叠片电芯体或者卷绕电芯体。
其中，在扣式电池标准件中，第一电极壳101、第二电极壳201均为金属壳，第一电极壳101、第二电极壳201的相对套接在一起，使正负极端盖相对。
在现有技术中，第一电极壳101、第二电极壳201均为金属材料，其厚度分别为2.0~2.5毫米左右，在第一电极壳101或者第二电极壳201的边缘设置有一卷边，在该卷边上设置一厚度厚于卷边的环形绝缘胶圈，使环形绝缘胶圈过盈间隔在第一电极壳101、第二电极壳201之间。
在本实施例中，第一电极壳101包括位于由金属制成的第一电极端盖102、以及由金属制成的第一环形壁体103，在第一环形壁体103外完全包覆有一体化的绝缘胶层301。在本实施例中，优选但不限于采用注塑工艺将绝缘胶设置在第一环形壁体103的内壁、外壁以及末端端面。
第二电极壳201包括位于由金属制成的第二电极端盖202、以及由金属制成的第二环形壁体203。
第一环形壁体103、第二环形壁体203内外嵌套，第一电极端盖102与第二电极端盖202相对，绝缘胶层301如图4所示地间隔在第一电极壳101、第二电极壳201之间的接触部位之间。
作为本实施例的示意，本实施例将第一电极壳101、第二电极壳201的厚度均做得很薄，厚度约为（0.15±0.03）毫米左右，在第一环形壁体103上设置有贯穿第一环形壁体103的通孔104，使包覆的绝缘胶层301的胶体充满这些通孔104，使绝缘胶层301为一体化结构。
由上可见，在本实施例的扣式锂离子电池中，由于在第一环形壁体103外完全紧密包裹有一体化的绝缘胶层301，相对于现有技术，采用该结构，有利于降低第一电极壳101、第二电极壳201的厚度及其之间的间隔，有利于增大扣式锂离子电池，在既定锂离子电池规格基础上，提高扣式电池的容量。
并且，采用本实施例技术方案，将第一电极壳101、第二电极壳201的第一环形壁体103、第二环形壁体203设置为平直状，而无需设置卷边，有利于增大壳体的内腔空间。
另外，在第一电极壳101的金属基壳上设置通孔104，使包裹的绝缘胶层301嵌在通孔104内，使绝缘胶层301牢牢地与金属基壳形成一体，将金属基壳包裹在其表面。采用该通孔104设置有利于进一步提高包覆的绝缘胶层301与第一电极壳101的结合的紧密度，有利于将绝缘胶层301做的更薄，进而增大壳体的内腔空间。
作为本实施例的示意，本实施例采用在第一电极壳101外周完全包覆与第一电极壳101通过通孔104结合为一体的绝缘胶层301薄膜，采用该包覆绝缘胶层301的结构，一方面确保了壳子的正负极绝缘隔离性，另一方面还弥补了第一电极壳101的薄型化设计，增强了壳体强度。
作为本实施例的示意，可以但不限于采用蚀刻工艺在第一电极壳101的金属基壳上制成提述的通孔104，该通孔104直径为0.1mm~1mm，使通孔104均匀分布在该金属基壳上。
作为本实施例的示意，将第一电极壳101的第一环形壁体103上的通孔104设置为边缘平滑无毛刺状为本发明优选方案，有利于降低电芯体的短路率。
作为本实施例的示意，可以但不限于采用注塑的方式，将绝缘胶层301包裹在第一电极壳101的表面，其中该绝缘胶层301在第一电极壳101表面的厚度设置为0.1~0.3毫米，采用注塑工艺能够确保绝缘胶层301能均匀注入通孔104，且提高金属基层表面的绝缘胶层301的均匀度,有利于超薄绝缘胶层301的成型。
参见图4所示，使绝缘胶层301在第一环形壁体103、第二环形壁体203之间过盈配合。
另外，还可以参见图4所示地在第一电极壳101外壁的绝缘胶层301上设置一沿斜坡，使斜坡上的绝缘胶层301沿靠近第一电机端盖102方向其厚度越来越厚，使第一环形壁体103、第二环形壁体203套接时其过盈强度由小变大，采用该斜坡设置一方面增强了第一电极壳101、第二电极壳201的配合紧固度，另一方面方便了第一电极壳101、第二电极壳201之间的套接连接，使套接更加省力简便。
作为本实施例的示意，还可以在第一电极壳101、第二电极壳201之间设置过盈配合的绝缘胶环（图中未画出），使绝缘胶环在所述第一电极壳101、第二电极壳201挤压下处于弹性变形状态，采用该绝缘胶环过盈配合地间隔设置有利于进一步提高第一电极壳101、第二电极壳201之间的紧固性。
其中，该绝缘胶环可以为绝缘胶层301上延伸在其外周的一圈起凸；也可以为与绝缘胶层301相独立，套接在绝缘胶层301外周的环形胶圈。
作为本实施例的示意，本实施例的第一电极壳101为负极，第二电极壳201为正极。
为了进一步说明本实施例技术方案效果，以下通过制作直径16毫米，厚度5.4毫米的圆形扣式电池的实验对比数据进行说明：
对照例：
本扣式锂离子电池结构包括：壳体、封装在金属壳体内的电芯体，其中该电芯体可以为叠片电芯体或者卷绕电芯体。
该壳体包括分别与电芯体的负极片、正极片电连接的第一电极壳、第二电极壳、以及间隔在第一电极壳、第二电极壳之间的绝缘胶圈。
其中，第一电极壳、第二电极壳的材料厚度为0.1~0.15毫米，绝缘胶圈厚度为0.08~0.1毫米。
在第一电极壳、第二电极壳构成的最大间置入锂离子电芯体，并使锂离子电信体的容量最大。
实施例 1 ：
本实施例与对照例不同之处在于：
第一电极壳的金属基壳为环形平面状，两边均无卷边，金属基壳的厚度为0.15毫米，在金属基壳表面通过注塑工艺完全包覆有绝缘胶层，绝缘胶层厚度为0.2毫米，整个绝缘胶层为一体化结构。
第二电极壳亦为平面无卷边的金属基壳，金属基壳的厚度为0.15毫米。
在第一电极壳、第二电极壳构成的最大间置入电芯体，并使锂离子电信体的容量最大。
其中，电芯体的制备工艺以及设备与对照例相同。
 
实施例 2 ：
本实施例与实施例1不同之处在于：
在第一电极壳的金属基壳表面还通过蚀刻工艺制有均匀分布的通孔，通孔直径为0.6~1毫米，完全包覆在金属基壳周围的绝缘胶层注入凝固在各通孔内，与金属基壳结合为一体。本实施例的绝缘胶层厚度为0.1毫米。
第二电极壳的结构以及尺寸同实施例1。
在第一电极壳、第二电极壳构成的最大间置入电芯体，并使锂离子电信体的容量最大。
其中，电芯体的制备工艺以及设备与对照例以及实施例相同。
对上述电池分别进行试验，得到以下表格实验数据
表一
Figure 558492dest_path_image001
Figure 156964dest_path_image002
由上表一可见，采用实施例2能取得意想不到的效果。
需要说明的是，本实施例的环形金属基壳以圆环形为示意，实际并不限于圆环形，比如还可以为方形环形或者其他形状的环形。
以上所述的实施方式，并不构成对该技术方案保护范围的限定。任何在上述实施方式的精神和原则之内所作的修改、等同替换和改进等，均应包含在该技术方案的保护范围之内。
 

Claims (27)

  1. 一种新型扣式锂离子电池，其特征是，包括：第一电极壳、第二电极壳，
    所述第一电极壳包括位于由金属制成的第一电极端盖、以及第一环形壁体，
    在所述第一环形壁体外完全包覆有绝缘胶层，所述绝缘胶层为一体化结构；
    所述第二电极壳包括，由金属制成的第二电极端盖、以及第二环形壁体，
    所述第一环形壁体、第二环形壁体内外相嵌套，所述第一电极端盖与所述第二电极端盖相对，所述绝缘胶层间隔在所述第一电极壳、第二电极壳之间的接触部位之间，
    在所述第一电极壳、第二电极壳构成的壳体内设置有电芯体，所述第一电极壳与所述电芯体的正极、负极的其中之一电连接，所述第二电极壳与所述电芯体的正极、负极的另一电连接。
  2. 根据权利要求1所述的新型扣式锂离子电池，其特征是，
    在所述第一环形壁体上还排布有贯穿的通孔，
    在各所述通孔内还充满有所述绝缘胶层。
  3. 根据权利要求2所述的新型扣式锂离子电池，其特征是，
    所述通孔边缘光滑。
  4. 根据权利要求2所述的新型扣式锂离子电池，其特征是，
    所述通孔采用蚀刻工艺形成。
  5. 根据权利要求2所述的新型扣式锂离子电池，其特征是，
    所述通孔的直径为0.1~1mm,误差为±0.03毫米。
  6. 根据权利要求1或2所述的新型扣式锂离子电池，其特征是，
    所述绝缘胶层通过注塑固化形成在所述第一环形壁体外。
  7. 根据权利要求1所述的新型扣式锂离子电池，其特征是，
    所述第一电极壳外的所述绝缘胶层、第二电极壳相互过盈配合嵌套连接。
  8. 根据权利要求7所述的新型扣式锂离子电池，其特征是，
    在所述绝缘胶层与所述第二电极壳相接触的外壁，设置有一坡度与所述第二电极壳套接方向相一致的平面斜坡，在所述平面斜坡部位，所述绝缘胶层往靠近所述第一电极端盖方向的厚度线性变厚。
  9. 根据权利要求7所述的新型扣式锂离子电池，其特征是，
    在所述第一电极壳、第二电极壳之间还过盈间隔有绝缘胶环，
    所述绝缘胶环在所述第一电极壳、第二电极壳挤压下呈弹性形变状态。
  10. 根据权利要求9所述的新型扣式锂离子电池，其特征是，
    所述绝缘胶环与所述绝缘胶层为一体，凸起在所述绝缘胶层的外壁。
  11. 根据权利要求9所述的新型扣式锂离子电池，其特征是，
    所述绝缘胶环与所述绝缘胶层相独立，套接在所述绝缘胶层的外壁。
  12. 根据权利要求1或2所述的新型扣式锂离子电池，其特征是，
    所述第一环形壁体、第二环形壁体均为平直无卷边状。
  13. 根据权利要求1或2所述的新型扣式锂离子电池，其特征是，
    所述第一电极端盖、以及第一环形壁体为一体化结构。
  14. 根据权利要求1或2所述的新型扣式锂离子电池，其特征是，
    所述第二电极端盖、以及第二环形壁体为一体化结构。
  15. 根据权利要求1或2所述的新型扣式锂离子电池，其特征是，
    所述第一环形壁体、和/或第二环形壁体的壁厚为（0.2±0.03）毫米。
  16. 根据权利要求1或2所述的新型扣式锂离子电池，其特征是，
    所述第一电极端盖、和/或第二电极端盖的厚度为（0.2±0.03）毫米。
  17. 根据权利要求1或2所述的新型扣式锂离子电池，其特征是，
    所述第一电极壳为正极，所述第二电极壳为负极。
  18. 一种新型扣式锂离子电池用壳体，其特征是，包括：第一电极壳、第二电极壳，
    所述第一电极壳包括位于由金属制成的第一电极端盖、以及第一环形壁体，
    在所述第一环形壁体上还排布有贯穿的通孔，在所述第一环形壁体外完全包覆有绝缘胶层，并且所述绝缘胶层充满各所述通孔，所述绝缘胶层为一体化结构；
    所述第二电极壳包括，由金属制成的第二电极端盖、以及第二环形壁体，
    所述第一环形壁体、第二环形壁体内外相嵌套，所述第一电极端盖与所述第二电极端盖相对，所述绝缘胶层间隔在所述第一电极壳、第二电极壳之间的接触部位之间。
  19. 根据权利要求18所述的新型扣式锂离子电池用壳体，其特征是，
    所述通孔边缘光滑。
  20. 根据权利要求18所述的新型扣式锂离子电池用壳体，其特征是，
    所述通孔采用蚀刻工艺形成。
  21. 根据权利要求18所述的新型扣式锂离子电池用壳体，其特征是，
    所述通孔的直径为0.1~1mm,误差为±0.03毫米。
  22. 根据权利要求18或19所述的新型扣式锂离子电池用壳体，其特征是，
    所述绝缘胶层通过注塑固化形成在所述第一环形壁体外。
  23. 根据权利要求18所述的新型扣式锂离子电池用壳体，其特征是，
    所述第一电极壳外的所述绝缘胶层、第二电极壳相互过盈配合嵌套连接。
  24. 根据权利要求23所述的新型扣式锂离子电池用壳体，其特征是，
    在所述绝缘胶层与所述第二电极壳相接触的外壁，设置有一坡度与所述第二电极壳套接方向相一致的平面斜坡，在所述平面斜坡部位，所述绝缘胶层往靠近所述第一电极端盖方向的厚度线性变厚。
  25. 根据权利要求23所述的新型扣式锂离子电池用壳体，其特征是，
    在所述第一电极壳、第二电极壳之间还过盈间隔有绝缘胶环，
    所述绝缘胶环在所述第一电极壳、第二电极壳挤压下呈弹性形变状态。
  26. 根据权利要求25所述的新型扣式锂离子电池用壳体，其特征是，
    所述绝缘胶环与所述绝缘胶层为一体，凸起在所述绝缘胶层的外壁。
  27. 根据权利要求25所述的新型扣式锂离子电池用壳体，其特征是，
    所述绝缘胶环与所述绝缘胶层相独立，套接在所述绝缘胶层的外壁。
     
PCT/CN2018/074369 2017-10-25 2018-01-27 新型扣式锂离子电池及其壳体 WO2019080394A1 (zh)

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