WO2021258924A1 - Button-type pouch battery cell and button battery - Google Patents

Button-type pouch battery cell and button battery Download PDF

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Publication number
WO2021258924A1
WO2021258924A1 PCT/CN2021/094430 CN2021094430W WO2021258924A1 WO 2021258924 A1 WO2021258924 A1 WO 2021258924A1 CN 2021094430 W CN2021094430 W CN 2021094430W WO 2021258924 A1 WO2021258924 A1 WO 2021258924A1
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WIPO (PCT)
Prior art keywords
button
battery cell
flange
battery
cell body
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PCT/CN2021/094430
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French (fr)
Chinese (zh)
Inventor
李升高
胡大林
郭玉杰
廖兴群
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曙鹏科技（深圳）有限公司
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Publication of WO2021258924A1 publication Critical patent/WO2021258924A1/en

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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
    • 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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • This application belongs to the technical field of soft-pack batteries, and particularly relates to a button-type soft-pack battery and a button battery.
  • Lithium-ion battery is a kind of secondary battery (rechargeable battery), which mainly relies on the movement of lithium ions between the positive and negative electrodes to work, and the soft-packed battery is an important part of the lithium-ion battery and the storage part of the lithium-ion battery , The quality of the soft pack battery determines the quality of the lithium-ion battery.
  • a button battery refers to a battery with a shape and size like a small button. Generally speaking, it has a larger diameter and a thinner thickness; a button battery includes a button-type soft-pack battery cell, which includes a pole piece, a diaphragm, and an aluminum-plastic film The diaphragm is used to separate the pole pieces with different polarities, and the aluminum-plastic film is used to encapsulate the pole pieces and the diaphragm in the up and down direction.
  • the edge is folded, but the aluminum on the edge of the flange is exposed and may be used as a conductor As a result, electronic components may be contacted and short-circuited by mistake during subsequent assembly, and it may also contact with its own negative electrode to form a galvanic cell, which may cause electrochemical corrosion.
  • the existing button-type soft-pack batteries usually use double-sided tape to be glued on the folded edge to avoid the exposed aluminum material of the folded edge.
  • the inventor realized that the double-sided tape can easily fall off from the folded edge, making the folded edge The aluminum on the end face is easily exposed.
  • the technical problem to be solved by this application is to provide a button-type soft-packed battery cell and a button battery in view of the problem that the existing folded end aluminum material is easy to be exposed.
  • a button-type soft-packed battery cell which includes a battery core body and an insulating sleeve.
  • the edge is bent along the axial direction of the battery core body, and the insulating sleeve is sleeved on the side surface of the battery core body and wraps the folded edge.
  • the insulating sleeve is an elastic sleeve.
  • the elastic sleeve is a PET sleeve, a rubber sleeve or a silicone sleeve.
  • the wall thickness of the elastic sleeve is 0.03-0.5 mm.
  • the inner diameter of the elastic sleeve is always the same along the axial direction of the battery core body.
  • the insulating sleeve completely covers the side surface of the battery core body.
  • the two ends of the insulating sleeve along the axial direction of the battery core body do not protrude from the axial end surface of the battery core body.
  • the diameter of the two ends of the insulating sleeve along the axial direction of the battery core body is smaller than the diameter of the middle cross section of the insulating sleeve.
  • the present application also provides a button battery, including the button-type soft-packed battery cell mentioned in any of the above technical solutions.
  • button battery of the present application it further includes a hard shell, and the button-type soft-packed battery cell is arranged in the hard shell.
  • the button-type soft-packed battery cell and the button battery provided in the present application have the beneficial effect that the insulating sleeve is sleeved on the side of the battery core body and wrapped around the folded edge, so that the insulating sleeve and the battery core body can be relatively fixed, so that the insulating sleeve is always wrapped Folding prevents the aluminum from being exposed on the end face of the flanging, thereby avoiding the flanging as a conductor and causing the flanging to be in contact with electronic components and short-circuiting during subsequent assembly, and preventing the flanging from contacting with its own negative electrode to form a primary battery and causing electrochemical corrosion ;
  • the insulating sleeve can also restrain the folding edge, avoiding the folding edge that is bent along the axial direction of the battery body from moving slowly toward the middle position of the battery body under the action of the extrusion stress, causing the folding edge to rebound, resulting in a button-type soft pack battery
  • FIG. 1 is a schematic structural diagram of a button-type soft-pack battery provided by an embodiment of the application
  • Figure 2 is a schematic diagram of part of the structure in Figure 1;
  • Fig. 3 is a schematic diagram of the structure of the insulating sleeve in Fig. 1.
  • the button-type soft-packed battery cell provided by the embodiments of the present application includes a battery core body 11 and an insulating sleeve 13. 12 is bent along the axial direction of the battery core body 11, and the insulating sleeve 13 is sleeved on the side surface of the battery core body 11 and wraps the flange 12.
  • the button-type soft-covered battery cell 1 provided by the present application has an insulating sleeve 13 sleeved on the side of the battery core body 11 and wraps the folds 12, so that the insulating sleeve 13 and the battery core body 11 can be relatively fixed. , So that the insulating sleeve 13 always wraps the folded edge 12, avoids the end surface aluminum of the folded edge 12 from being exposed, thus avoiding the folded edge 12 as a conductor, which may cause false contact with electronic components and short-circuit during subsequent assembly, and avoid the folded edge 12 from being short-circuited.
  • Electrochemical corrosion occurs when the negative electrode of itself is in contact with the galvanic cell; the insulating sleeve 13 can also restrain the folding edge 12 to prevent the folding edge 12 bent along the axial direction of the cell body 11 from facing the cell body 11 under the action of extrusion stress.
  • the slow movement of the intermediate position causes the folding edge 12 to rebound, resulting in an increase in the volume of the button-type soft-packed battery cell 1; After folding, the gap between the folded edge 12 and the side surface of the cell body 11 can be retained, a certain space is reserved for the cyclic expansion of the cell body 11, and the safety performance of the button-type soft-packed cell 1 is improved.
  • the insulating sleeve 13 is an elastic sleeve, which is convenient for covering the insulating sleeve 13 on the cell body 11, and at the same time, it is convenient to tie the folded edge 12 to prevent the folded edge 12 from rebounding and cause the volume of the button-type soft-packed cell 1 Increase.
  • the elastic sleeve is a PET sleeve, a rubber sleeve or a silicone sleeve, which is convenient for the user to select the insulating sleeve 13 of different materials according to the manufacturing cost, volume, energy density, safety performance and other requirements of the button-type soft-pack battery cell 1.
  • the wall thickness of the elastic sleeve is 0.03-0.5mm to ensure the strength of the elastic sleeve, avoid the elastic sleeve wall thickness is too thin and break, and at the same time avoid the elastic sleeve wall thickness is too thick to increase the button type
  • the volume of the soft-packed battery cell 1 and the thick wall thickness of the elastic sleeve will increase the difficulty of putting the insulating sleeve 13 on the battery core body 11.
  • the inner diameter of the elastic sleeve is always the same along the axial direction of the battery core body 11.
  • the elastic sleeve is used to make the elastic sleeve fit in a variety of different shapes.
  • the side surface of the core body 11 improves the versatility of the elastic sleeve.
  • the insulating sleeve 13 fully covers the side surface of the cell body 11, preventing foreign objects from contacting the side surface of the cell body 11 and piercing the cell body 11, resulting in damage to the cell body 11. At the same time, it can also insulate the side surface of the cell body 11 to avoid electrochemical corrosion when the side surface of the cell body 11 is scratched in contact with other structures.
  • the two ends of the insulating sleeve 13 along the axial direction of the cell body 11 do not protrude from the axial end surface of the cell body 11 to prevent the two ends of the insulating sleeve 13 from protruding.
  • the axial end surface of the core body 11 causes the portion of the insulating sleeve 13 protruding from the axial end surface of the cell body 11 to occupy space, which affects the energy density of the button-type soft-packed cell 1.
  • the diameter of the two ends of the insulating sleeve 13 along the axial direction of the cell body 11 is smaller than the diameter of the middle cross section of the insulating sleeve 13 (not shown), so that the diameter of the insulating sleeve 13 follows the diameter of the cell body 11 With the change of the diameter, the entire insulating sleeve 13 and the cell body 11 fit more compactly.
  • the present application also provides a button battery, which includes the button-type soft-packed battery cell 1 described in any of the above embodiments.
  • the folded edge 12 is insulated by the insulating sleeve 13 provided on the side of the cell body 11, so that the aluminum material on the end face of the folded edge 12 is prevented from being exposed.
  • the components are contacted and short-circuited by mistake, and the insulating sleeve 13 can also bind the fold 12 to reduce the volume of the button-type soft-packed cell 1 and increase the energy density of the button-type soft-packed cell 1.
  • the button battery further includes a hard shell, and the button-type soft-pack battery cell 1 is arranged in the hard shell to protect the cell body 11 through the hard shell to prevent external force from being applied to the cell body 11 , Resulting in damage to the cell body 11.

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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)
  • Materials Engineering (AREA)
  • Battery Mounting, Suspending (AREA)

Abstract

The present application belongs to the technical field of pouch batteries, and relates to a button-type pouch battery cell and a button battery. The button-type pouch battery cell comprises a battery cell body and an insulation sleeve, wherein a side face of the battery cell body is provided with a flange surrounding the circumference of the battery cell body; the flange is bent in the axial direction of the battery cell body; and the insulation sleeve is sheathed over the side face of the battery cell body and wraps the flange. By means of the insulation sleeve being sheathed over the side face of the battery cell body and wrapping the flange, the insulation sleeve always wraps the flange so as to prevent aluminum material of an end face of the flange from being exposed and thus prevent short-circuiting for the reason that the flange, acting as a conductor, comes into contact with an electronic component by mistake during subsequent assembly, so as to avoid electrochemical corrosion caused by the formation of a galvanic cell when the flange is in contact with its own negative electrode. In addition, the insulation sleeve can also restrain the flange, so as to prevent the increase of the volume of the button-type pouch battery cell due to the rebound of the flange caused by the slow movement of the flange, which is bent in the axial direction of the battery cell body, towards the middle position of the battery cell body under the action of pressing stress.

Description

扣式软包电芯及纽扣电池Button-type soft-pack batteries and button batteries
本申请要求于2020年06月23日提交中国专利局、申请号为202021208880.9，发明名称为“扣式软包电芯及纽扣电池”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。This application claims the priority of a Chinese patent application filed with the Chinese Patent Office on June 23, 2020, the application number is 202021208880.9, and the invention title is "Button-type soft-pack batteries and button batteries", the entire content of which is incorporated herein by reference Applying.
技术领域Technical field
本申请属于软包电池技术领域，特别是涉及一种扣式软包电芯及纽扣电池。This application belongs to the technical field of soft-pack batteries, and particularly relates to a button-type soft-pack battery and a button battery.
背景技术Background technique
锂离子电池是一种二次电池(充电电池)，主要依靠锂离子在正极和负极之间移动来工作，而软包电芯是锂离子电池的重要组成部分，是锂离子电池的蓄电部分，软包电芯的质量决定了锂离子电池的质量。Lithium-ion battery is a kind of secondary battery (rechargeable battery), which mainly relies on the movement of lithium ions between the positive and negative electrodes to work, and the soft-packed battery is an important part of the lithium-ion battery and the storage part of the lithium-ion battery , The quality of the soft pack battery determines the quality of the lithium-ion battery.
纽扣电池是指外形尺寸像一颗小纽扣的电池，一般来说直径较大，厚度较薄；纽扣电池包括扣式软包电芯，扣式软包电芯包括极片、隔膜和铝塑膜，隔膜用于分离极性不同的极片，铝塑膜用于沿上下方向封装极片和隔膜，铝塑膜封装后其边缘形成折边，然而折边的端面铝材裸露在外，可能作为导体导致后续装配时导致电子元器件误接触短路，还有可能跟自身负极接触形成原电池，发生电化学腐蚀。A button battery refers to a battery with a shape and size like a small button. Generally speaking, it has a larger diameter and a thinner thickness; a button battery includes a button-type soft-pack battery cell, which includes a pole piece, a diaphragm, and an aluminum-plastic film The diaphragm is used to separate the pole pieces with different polarities, and the aluminum-plastic film is used to encapsulate the pole pieces and the diaphragm in the up and down direction. After the aluminum-plastic film is encapsulated, the edge is folded, but the aluminum on the edge of the flange is exposed and may be used as a conductor As a result, electronic components may be contacted and short-circuited by mistake during subsequent assembly, and it may also contact with its own negative electrode to form a galvanic cell, which may cause electrochemical corrosion.
现有的扣式软包电芯通常采用在折边上粘贴双面胶的方式，避免折边的端面铝材裸露，然而发明人意识到双面胶很容易从折边上脱落，使得折边的端面铝材容易裸露在外。The existing button-type soft-pack batteries usually use double-sided tape to be glued on the folded edge to avoid the exposed aluminum material of the folded edge. However, the inventor realized that the double-sided tape can easily fall off from the folded edge, making the folded edge The aluminum on the end face is easily exposed.
技术问题technical problem
本申请所要解决的技术问题是：针对现有的折边的端面铝材容易裸露的问题，提供一种扣式软包电芯及纽扣电池。The technical problem to be solved by this application is to provide a button-type soft-packed battery cell and a button battery in view of the problem that the existing folded end aluminum material is easy to be exposed.
技术解决方案Technical solutions
本申请解决上述技术问题所采用的技术方案如下：提供一种扣式软包电芯，包括电芯本体和绝缘套，所述电芯本体的侧面具有环绕其周向的折边，所述折边沿所述电芯本体的轴向弯折，所述绝缘套套设于所述电芯本体的侧面，并包裹所述折边。The technical solutions adopted by the present application to solve the above technical problems are as follows: a button-type soft-packed battery cell is provided, which includes a battery core body and an insulating sleeve. The edge is bent along the axial direction of the battery core body, and the insulating sleeve is sleeved on the side surface of the battery core body and wraps the folded edge.
在本申请上述扣式软包电芯中，所述绝缘套为弹性套。In the above button-type soft-pack battery core of the present application, the insulating sleeve is an elastic sleeve.
在本申请上述扣式软包电芯中，所述弹性套为PET套、橡胶套或硅胶套。In the above-mentioned button-type soft-pack battery core of the present application, the elastic sleeve is a PET sleeve, a rubber sleeve or a silicone sleeve.
在本申请上述扣式软包电芯中，所述弹性套的壁厚为0.03-0.5mm。In the above button-type soft-pack battery core of the present application, the wall thickness of the elastic sleeve is 0.03-0.5 mm.
在本申请上述扣式软包电芯中，所述弹性套的内侧直径沿所述电芯本体的轴向始终相同。In the above-mentioned button-type soft-pack battery core of the present application, the inner diameter of the elastic sleeve is always the same along the axial direction of the battery core body.
在本申请上述扣式软包电芯中，所述绝缘套全覆盖所述电芯本体的侧面。In the above-mentioned button-type soft-pack battery core of the present application, the insulating sleeve completely covers the side surface of the battery core body.
在本申请上述扣式软包电芯中，所述绝缘套的沿所述电芯本体的轴向的两端不凸出所述电芯本体的轴向的端面。In the above button-type soft-packed battery core of the present application, the two ends of the insulating sleeve along the axial direction of the battery core body do not protrude from the axial end surface of the battery core body.
在本申请上述扣式软包电芯中，所述绝缘套的沿所述电芯本体的轴向的两端的直径小于所述绝缘套的中间横截面的直径。In the above button-type soft-pack battery core of the present application, the diameter of the two ends of the insulating sleeve along the axial direction of the battery core body is smaller than the diameter of the middle cross section of the insulating sleeve.
本申请还提供一种纽扣电池，包括上述任一技术方案述及的扣式软包电芯。The present application also provides a button battery, including the button-type soft-packed battery cell mentioned in any of the above technical solutions.
在本申请上述纽扣电池中，还包括硬质壳体，所述扣式软包电芯设于所述硬质壳体内。In the above-mentioned button battery of the present application, it further includes a hard shell, and the button-type soft-packed battery cell is arranged in the hard shell.
有益效果Beneficial effect
本申请提供的扣式软包电芯及纽扣电池的有益效果在于，通过绝缘套套设于电芯本体的侧面，并包裹折边，便于将绝缘套与电芯本体相对固定，使得绝缘套始终包裹折边，避免了折边的端面铝材裸露在外，从而避免了折边作为导 体导致后续装配时与电子元器件误接触而短路，避免了折边跟自身负极接触形成原电池而发生电化学腐蚀；绝缘套还能束缚折边，避免沿电芯本体的轴向弯折的折边在挤压应力的作用下朝向电芯本体的中间位置缓慢运动而造成折边反弹，导致扣式软包电芯的体积增大；电芯本体的侧面能支撑绝缘套，因此在折边朝向电芯本体的轴向弯折后，能保留折边与电芯本体的侧面之间的间隙，为电芯本体的循环膨胀预留了一定的空间，提高了扣式软包电芯的安全性能。The button-type soft-packed battery cell and the button battery provided in the present application have the beneficial effect that the insulating sleeve is sleeved on the side of the battery core body and wrapped around the folded edge, so that the insulating sleeve and the battery core body can be relatively fixed, so that the insulating sleeve is always wrapped Folding prevents the aluminum from being exposed on the end face of the flanging, thereby avoiding the flanging as a conductor and causing the flanging to be in contact with electronic components and short-circuiting during subsequent assembly, and preventing the flanging from contacting with its own negative electrode to form a primary battery and causing electrochemical corrosion ; The insulating sleeve can also restrain the folding edge, avoiding the folding edge that is bent along the axial direction of the battery body from moving slowly toward the middle position of the battery body under the action of the extrusion stress, causing the folding edge to rebound, resulting in a button-type soft pack battery The volume of the core increases; the side surface of the cell body can support the insulating sleeve, so after the folding edge is bent toward the axial direction of the cell body, the gap between the folding edge and the side surface of the cell body can be retained, which is the cell body The cyclic expansion reserves a certain amount of space, which improves the safety performance of the button-type soft-pack batteries.
附图说明Description of the drawings
图1为本申请实施例提供的扣式软包电芯的结构示意图；FIG. 1 is a schematic structural diagram of a button-type soft-pack battery provided by an embodiment of the application;
图2为图1中的部分结构示意图；Figure 2 is a schematic diagram of part of the structure in Figure 1;
图3为图1中绝缘套的结构示意图。Fig. 3 is a schematic diagram of the structure of the insulating sleeve in Fig. 1.
说明书中的附图标记如下：The reference signs in the specification are as follows:
1、扣式软包电芯；11、电芯本体；12、折边；13、绝缘套。1. Button-type soft-pack battery cell; 11. Cell body; 12. Folding edge; 13. Insulating sleeve.
具体实施方式detailed description
为了使本申请所要解决的技术问题、技术方案及有益效果更加清楚明白，以下结合附图及实施例，对本申请进行进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本申请，并不用于限定本申请。In order to make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, and are not used to limit the present application.
如图1至图3所示，本申请实施例提供的扣式软包电芯，包括电芯本体11和绝缘套13，电芯本体11的侧面具有环绕其周向的折边12，折边12沿电芯本体11的轴向弯折，绝缘套13套设于电芯本体11的侧面，并包裹折边12。As shown in Figures 1 to 3, the button-type soft-packed battery cell provided by the embodiments of the present application includes a battery core body 11 and an insulating sleeve 13. 12 is bent along the axial direction of the battery core body 11, and the insulating sleeve 13 is sleeved on the side surface of the battery core body 11 and wraps the flange 12.
本申请提供的扣式软包电芯1，与现有技术相比，绝缘套13套设于电芯本体11的侧面，并包裹折边12，便于将绝缘套13与电芯本体11相对固定，使得绝缘套13始终包裹折边12，避免了折边12的端面铝材裸露在外，从而避免了折边12作为导体导致后续装配时与电子元器件误接触而短路，避免了折边12跟自身负极接触形成原电池而发生电化学腐蚀；绝缘套13还能束缚折边12， 避免沿电芯本体11的轴向弯折的折边12在挤压应力的作用下朝向电芯本体11的中间位置缓慢运动而造成折边12反弹，导致扣式软包电芯1的体积增大；电芯本体11的侧面能支撑绝缘套13，因此在折边12朝向电芯本体11的轴向弯折后，能保留折边12与电芯本体11的侧面之间的间隙，为电芯本体11的循环膨胀预留了一定的空间，提高了扣式软包电芯1的安全性能。Compared with the prior art, the button-type soft-covered battery cell 1 provided by the present application has an insulating sleeve 13 sleeved on the side of the battery core body 11 and wraps the folds 12, so that the insulating sleeve 13 and the battery core body 11 can be relatively fixed. , So that the insulating sleeve 13 always wraps the folded edge 12, avoids the end surface aluminum of the folded edge 12 from being exposed, thus avoiding the folded edge 12 as a conductor, which may cause false contact with electronic components and short-circuit during subsequent assembly, and avoid the folded edge 12 from being short-circuited. Electrochemical corrosion occurs when the negative electrode of itself is in contact with the galvanic cell; the insulating sleeve 13 can also restrain the folding edge 12 to prevent the folding edge 12 bent along the axial direction of the cell body 11 from facing the cell body 11 under the action of extrusion stress. The slow movement of the intermediate position causes the folding edge 12 to rebound, resulting in an increase in the volume of the button-type soft-packed battery cell 1; After folding, the gap between the folded edge 12 and the side surface of the cell body 11 can be retained, a certain space is reserved for the cyclic expansion of the cell body 11, and the safety performance of the button-type soft-packed cell 1 is improved.
在一实施例中，绝缘套13为弹性套，便于将绝缘套13套设于电芯本体11，同时还方便束缚折边12，避免折边12反弹而导致扣式软包电芯1的体积增大。In one embodiment, the insulating sleeve 13 is an elastic sleeve, which is convenient for covering the insulating sleeve 13 on the cell body 11, and at the same time, it is convenient to tie the folded edge 12 to prevent the folded edge 12 from rebounding and cause the volume of the button-type soft-packed cell 1 Increase.
在一实施例中，弹性套为PET套、橡胶套或硅胶套，方便用户根据扣式软包电芯1的制造成本、体积、能量密度、安全性能等需求选择不同材质的绝缘套13。In one embodiment, the elastic sleeve is a PET sleeve, a rubber sleeve or a silicone sleeve, which is convenient for the user to select the insulating sleeve 13 of different materials according to the manufacturing cost, volume, energy density, safety performance and other requirements of the button-type soft-pack battery cell 1.
在一实施例中，弹性套的壁厚为0.03-0.5mm，以保证弹性套的强度，避免弹性套的壁厚太薄而断开，同时避免弹性套的壁厚太厚而增大扣式软包电芯1的体积，并且弹性套的壁厚太厚会增加绝缘套13套设于电芯本体11上的难度。In one embodiment, the wall thickness of the elastic sleeve is 0.03-0.5mm to ensure the strength of the elastic sleeve, avoid the elastic sleeve wall thickness is too thin and break, and at the same time avoid the elastic sleeve wall thickness is too thick to increase the button type The volume of the soft-packed battery cell 1 and the thick wall thickness of the elastic sleeve will increase the difficulty of putting the insulating sleeve 13 on the battery core body 11.
在一实施例中，如图1及图3所示，弹性套的内侧直径沿电芯本体11的轴向始终相同，利用弹性套的弹性，使得弹性套能套设于多种形状不同的电芯本体11的侧面，提高弹性套的通用性。In one embodiment, as shown in FIGS. 1 and 3, the inner diameter of the elastic sleeve is always the same along the axial direction of the battery core body 11. The elastic sleeve is used to make the elastic sleeve fit in a variety of different shapes. The side surface of the core body 11 improves the versatility of the elastic sleeve.
在一实施例中，如图1所示，绝缘套13全覆盖电芯本体11的侧面，避免外物与电芯本体11的侧面接触而刺穿电芯本体11，导致电芯本体11损坏，同时也能绝缘电芯本体11的侧面，避免电芯本体11的侧面被划伤后与其他结构接触发生电化学腐蚀。In one embodiment, as shown in FIG. 1, the insulating sleeve 13 fully covers the side surface of the cell body 11, preventing foreign objects from contacting the side surface of the cell body 11 and piercing the cell body 11, resulting in damage to the cell body 11. At the same time, it can also insulate the side surface of the cell body 11 to avoid electrochemical corrosion when the side surface of the cell body 11 is scratched in contact with other structures.
在一实施例中，如图1所示，绝缘套13的沿电芯本体11的轴向的两端不凸出电芯本体11的轴向的端面，避免绝缘套13的两端凸出电芯本体11的轴向的端面，导致绝缘套13的凸出电芯本体11的轴向端面的部分占用空间，影响扣式软包电芯1的能量密度。In one embodiment, as shown in FIG. 1, the two ends of the insulating sleeve 13 along the axial direction of the cell body 11 do not protrude from the axial end surface of the cell body 11 to prevent the two ends of the insulating sleeve 13 from protruding. The axial end surface of the core body 11 causes the portion of the insulating sleeve 13 protruding from the axial end surface of the cell body 11 to occupy space, which affects the energy density of the button-type soft-packed cell 1.
在一实施例中，绝缘套13的沿电芯本体11的轴向的两端的直径小于绝缘套13的中间横截面的直径(未示出)，以使绝缘套13的直径随电芯本体11 的直径的变化而变化，使得整个绝缘套13与电芯本体11更紧凑地贴合。In one embodiment, the diameter of the two ends of the insulating sleeve 13 along the axial direction of the cell body 11 is smaller than the diameter of the middle cross section of the insulating sleeve 13 (not shown), so that the diameter of the insulating sleeve 13 follows the diameter of the cell body 11 With the change of the diameter, the entire insulating sleeve 13 and the cell body 11 fit more compactly.
本申请还提供一种纽扣电池，纽扣电池包括上述任一实施例述及的扣式软包电芯1。The present application also provides a button battery, which includes the button-type soft-packed battery cell 1 described in any of the above embodiments.
本申请提供的纽扣电池，通过设于电芯本体11侧面的绝缘套13绝缘折边12，避免了折边12的端面铝材裸露在外，从而避免了折边12作为导体导致后续装配时与电子元器件误接触而短路，同时绝缘套13还能束缚折边12，以减小扣式软包电芯1的体积，从而增大扣式软包电芯1的能量密度。In the button battery provided by the present application, the folded edge 12 is insulated by the insulating sleeve 13 provided on the side of the cell body 11, so that the aluminum material on the end face of the folded edge 12 is prevented from being exposed. The components are contacted and short-circuited by mistake, and the insulating sleeve 13 can also bind the fold 12 to reduce the volume of the button-type soft-packed cell 1 and increase the energy density of the button-type soft-packed cell 1.
在一实施例中，纽扣电池还包括硬质壳体，扣式软包电芯1设于硬质壳体内，以通过硬质壳体保护电芯本体11，避免外力施加于电芯本体11上，导致电芯本体11损坏。In one embodiment, the button battery further includes a hard shell, and the button-type soft-pack battery cell 1 is arranged in the hard shell to protect the cell body 11 through the hard shell to prevent external force from being applied to the cell body 11 , Resulting in damage to the cell body 11.
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。The above are only the preferred embodiments of this application and are not intended to limit this application. Any modification, equivalent replacement and improvement made within the spirit and principle of this application shall be included in the protection of this application. Within range.

Claims (10)

  1. 一种扣式软包电芯，包括电芯本体，所述电芯本体的侧面具有环绕其周向的折边，所述折边沿所述电芯本体的轴向弯折，其中，还包括绝缘套，所述绝缘套套设于所述电芯本体的侧面，并包裹所述折边。A button-type soft-packed battery cell includes a battery core body. The side surface of the battery core body has a folded edge that surrounds the circumference of the battery core body. The folded edge is bent along the axial direction of the battery core body. The insulating sleeve is sleeved on the side of the battery core body and wraps the folded edge.
  2. 根据权利要求1所述的扣式软包电芯，其中，所述绝缘套为弹性套。The button-type soft-pack battery cell according to claim 1, wherein the insulating sleeve is an elastic sleeve.
  3. 根据权利要求2所述的扣式软包电芯，其中，所述弹性套为PET套、橡胶套或硅胶套。The button-type soft-pack battery cell according to claim 2, wherein the elastic sleeve is a PET sleeve, a rubber sleeve or a silicone sleeve.
  4. 根据权利要求2所述的扣式软包电芯，其中，所述弹性套的壁厚为0.03-0.5mm。The button-type soft-pack battery cell according to claim 2, wherein the wall thickness of the elastic sleeve is 0.03-0.5mm.
  5. 根据权利要求2所述的扣式软包电芯，其中，所述弹性套的内侧直径沿所述电芯本体的轴向始终相同。4. The button-type soft-pack battery cell according to claim 2, wherein the inner diameter of the elastic sleeve is always the same along the axial direction of the battery core body.
  6. 根据权利要求1所述的扣式软包电芯，其中，所述绝缘套全覆盖所述电芯本体的侧面。The button-type soft-pack battery cell according to claim 1, wherein the insulating sleeve completely covers the side surface of the battery core body.
  7. 根据权利要求6所述的扣式软包电芯，其中，所述绝缘套的沿所述电芯本体的轴向的两端不凸出所述电芯本体的轴向的端面。The button type soft-pack battery cell according to claim 6, wherein the two ends of the insulating sleeve along the axial direction of the battery core body do not protrude from the axial end surface of the battery core body.
  8. 根据权利要求1所述的扣式软包电芯，其中，所述绝缘套的沿所述电芯本体的轴向的两端的直径小于所述绝缘套的中间横截面的直径。The button-type soft-packed battery cell according to claim 1, wherein the diameter of the two ends of the insulating sleeve along the axial direction of the battery core body is smaller than the diameter of the middle cross section of the insulating sleeve.
  9. 一种纽扣电池，其中，包括权利要求1-9任意一项所述的扣式软包电芯。A button battery, which comprises the button-type soft-packed battery cell according to any one of claims 1-9.
  10. 根据权利要求9所述的纽扣电池，其中，还包括硬质壳体，所述扣式软包电芯设于所述硬质壳体内。The button battery according to claim 9, further comprising a hard shell, and the button-type soft-packed battery cell is arranged in the hard shell.
PCT/CN2021/094430 2020-06-23 2021-05-18 Button-type pouch battery cell and button battery WO2021258924A1 (en)

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