WO2021109315A1 - 一种蝶豆扣式软包电芯 - Google Patents

一种蝶豆扣式软包电芯 Download PDF

Info

Publication number
WO2021109315A1
WO2021109315A1 PCT/CN2020/070767 CN2020070767W WO2021109315A1 WO 2021109315 A1 WO2021109315 A1 WO 2021109315A1 CN 2020070767 W CN2020070767 W CN 2020070767W WO 2021109315 A1 WO2021109315 A1 WO 2021109315A1
Authority
WO
WIPO (PCT)
Prior art keywords
plastic film
film layer
battery cell
aluminum
upper aluminum
Prior art date
Application number
PCT/CN2020/070767
Other languages
English (en)
French (fr)
Inventor
李良彬
肖海燕
刘晓伟
董水金
柯丽琴
Original Assignee
新余赣锋电子有限公司
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 新余赣锋电子有限公司 filed Critical 新余赣锋电子有限公司
Publication of WO2021109315A1 publication Critical patent/WO2021109315A1/zh

Links

Images

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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • 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

  • the utility model relates to the technical field of batteries, in particular to a butterfly bean button type soft-packed battery cell.
  • lithium-ion power batteries have the advantages of high specific energy, many cycles of use, and long storage time. Not only are they often used in portable electronic devices such as mobile phones, digital cameras, and notebook computers, they are also used more and more. In terms of large and medium-sized electric equipment such as electric vehicles, electric bicycles, and electric tools, the performance requirements for lithium-ion power batteries are becoming higher and higher.
  • the batteries are first put into the aluminum-plastic film. After sealing, the electrolyte is injected to produce a polarization reaction. When the lithium ion of the battery is activated and freed, the battery will produce carbon dioxide, methane and other gases that cannot be discharged, which will cause the pole piece to expand, and the gap in the winding body will increase.
  • the electrolyte deposits which causes the size of the battery to be deformed, the positive and negative plates are not tightly attached, which affects the formation of the SEI film, and is easy to deposit lithium, resulting in poor battery circulation, electrolyte leakage, internal short-circuits and other unsafe hidden dangers.
  • the utility model is completed in order to solve the deficiencies in the prior art.
  • the purpose of the utility model is to provide a butterfly peas button soft with simple structure, flexible layout, strong practicability, good safety and greatly improved yield rate of finished products. Pack batteries.
  • a butterfly bean button type soft-pack battery cell of the present invention includes an upper aluminum plastic film layer, a lower aluminum plastic film layer and a battery core body.
  • the lower aluminum plastic film layer is provided with a first battery accommodating the battery core body.
  • the upper aluminum plastic film layer and the lower aluminum plastic film layer are in close contact with the upper and lower parts of the battery body at corresponding positions above and below the battery body, and the upper aluminum
  • the overlapped portion of the plastic film layer and the lower aluminum plastic film layer extending radially outward from the vertical surface of the cell body is sealed and hot-pressed to form an edge seal, and the edge seal is along the vertical surface of the cell body
  • the outer periphery of the edge sealing is formed by connecting straight edges and round edges end to end, and the upper aluminum plastic film layer and the lower aluminum plastic film layer are on the straight side
  • the corresponding positions are integrally fixed, and the upper aluminum plastic film layer is further provided with an air bag containing excess electrolyte and gas on the side of the round side away from the straight side.
  • the butterfly peas button type soft pack battery of the present invention can also be:
  • the upper aluminum plastic film layer is also provided with a second cavity for accommodating the battery core body.
  • a first insulating layer is arranged between the upper aluminum-plastic film and the cell body, the upper surface of the first insulating layer is fixed to the inner wall of the upper aluminum-plastic film layer, and the lower part of the first insulating layer The surface is tightly attached to the battery core body, and both ends of the first insulating layer extend along the inner side of the upper aluminum-plastic film layer to the inner periphery of the edge sealing.
  • the cell body includes a winding piece wound in the center and impregnated with electrolyte, a positive electrode lug and a negative electrode lug arranged on the winding piece at intervals, a fixed end of the positive electrode lug and a fixed end of the negative electrode lug
  • the free ends of the positive electrode ears and the free ends of the negative electrode ears are respectively connected to the winding parts and extend to the outside of the battery core body through the sealing edge.
  • the free end of the positive electrode lug is fixed to the upper aluminum plastic film layer and the lower aluminum plastic film layer in a three-layer manner at a position overlapping with the sealing edge, and the free end of the negative electrode lug is in contact with the sealing edge.
  • the overlapping position of the side is fixed in three layers with the upper aluminum plastic film layer and the lower aluminum plastic film layer.
  • the included angle between the positive electrode ear and the negative electrode ear is set to be 5-180°.
  • the winding member is cylindrical or square, and the winding member includes a positive electrode sheet, a negative electrode sheet, and a separator, the positive electrode sheet and the negative electrode sheet are alternately stacked and wound to form a cylinder, and the separator film is arranged in the Between the positive electrode sheet and the negative electrode sheet.
  • the positive electrode sheet, the negative electrode sheet and the isolation membrane are all fully infiltrated by the electrolyte.
  • the positive electrode sheet includes a positive electrode current collector and a positive electrode coating body coated on the outside of the current collector
  • the negative electrode sheet includes a negative electrode current collector and a negative electrode coating body coated on the outside of the current collector.
  • a second insulating layer is provided on the outer circumference of the winding member, the inner side of the second insulating layer is closely attached to the outer circumference of the winding member, and the outer side of the second insulating layer is in contact with the lower aluminum plastic film The layers fit closely together.
  • a butterfly bean button type soft-pack battery cell of the present invention includes an upper aluminum plastic film layer, a lower aluminum plastic film layer and a battery core body.
  • the lower aluminum plastic film layer is provided with a first battery accommodating the battery core body.
  • the upper aluminum plastic film layer and the lower aluminum plastic film layer are in close contact with the upper and lower parts of the battery body at corresponding positions above and below the battery body, and the upper aluminum
  • the overlapped portion of the plastic film layer and the lower aluminum plastic film layer extending radially outward from the vertical surface of the cell body is sealed and hot-pressed to form an edge seal, and the edge seal is along the vertical surface of the cell body
  • the outer periphery of the edge sealing is formed by connecting straight edges and round edges end to end, and the upper aluminum plastic film layer and the lower aluminum plastic film layer are on the straight side
  • the corresponding positions are integrally fixed, and the upper aluminum plastic film layer is further provided with an air bag containing excess electrolyte and gas on the side of the round side away from the straight side.
  • a piece of aluminum plastic film is first stamped into a first folding part with an air bag and a second folding part with the first cavity.
  • the second folding part is equipped with air bags. It can also be the first folding part or the second folding part with the first cavity and the first folding part and the second folding part are equipped with symmetrically distributed air bags.
  • the first folding part and the second folding part are equipped with air bags.
  • the center of symmetry of the two folding parts is provided with a double fold line, the cell body is put into the first cavity, and then the first fold part is folded upward along the double fold line, so that the first fold part forms the upper part Aluminum-plastic film layer, the second folding part forms the lower aluminum-plastic film layer, and the fold line forms the straight edge, and then the upper aluminum-plastic film layer and the lower aluminum-plastic film layer are sealed ,
  • the side where the air bag is located is kept in communication with the outside, the air bag is kept in communication with the first cavity, and the liquid is quickly injected into the first cavity through the side of the air bag to accelerate the electrolyte to the cell
  • the infiltration of the body, the excessive electrolyte infiltration without dead corners can effectively reduce the static infiltration time.
  • the injection gun can be completely inserted into the diversion port to effectively prevent the electrolyte from splashing on the surface of the battery.
  • the upper aluminum plastic film layer and the lower aluminum plastic film layer on the outside of the air bag are encapsulated. Then use a small current to charge the body of the battery, and the body of the battery begins to form.
  • the lithium ion of the battery is activated and freed, the battery will generate carbon dioxide, methane and other gases.
  • the battery produces gas, most of the Gas and excess electrolyte will flow into the air bag through the connection between the first cavity and the air bag for storage, which effectively ensures that the size of the cell is not deformed during the formation process, and there is no risk of excess liquid sinking.
  • the butterfly bean button type soft-pack battery cell of the utility model has the advantages of simple structure, flexible layout, strong practicability, good safety, and greatly improved product yield.
  • Figure 1 is an exploded view of an embodiment of a butterfly-pea button type soft-pack battery cell of the utility model.
  • Figure 2 is a front view of a butterfly-pea button type soft-pack battery cell of the utility model.
  • Fig. 3 is a cross-sectional view of Fig. 2A-A of a butterfly-pea button type soft-pack battery cell of the present invention.
  • Fig. 4 is a perspective view of the first embodiment of a butterfly-pea button type soft-pack battery cell according to the present invention.
  • Fig. 5 is a perspective view of the second embodiment of a butterfly-pea button type soft-pack battery cell according to the present invention.
  • the butterfly bean button type soft-pack battery cell of the present invention please refer to the relevant figures in Figures 1 to 5, including the upper aluminum plastic film layer 3, the lower aluminum plastic film layer 4 and the battery core body 2.
  • the aluminum-plastic film layer 4 is provided with a first cavity 12 for accommodating the cell body 2, and the upper aluminum-plastic film layer 3 and the lower aluminum-plastic film layer 4 are respectively above and below the cell body 2 Corresponding positions are closely attached to the upper and lower parts of the battery core body 2, and the upper aluminum plastic film layer 3 and the lower aluminum plastic film layer 4 extend radially outward from the vertical surface of the battery core body 2 The overlapped part of the battery is sealed and hot-pressed to form an edge seal 7.
  • the edge seal 7 extends along the vertical surface of the cell body 2 to the top of the cell body 2, and the outer periphery of the edge seal 7 is formed by a straight edge. 8 and the round side 9 are surrounded end to end.
  • the upper aluminum plastic film layer 3 and the lower aluminum plastic film layer 4 are integrally fixed at the corresponding position of the straight side 8.
  • the upper aluminum plastic film layer 3 On the side of the round side 9 away from the straight side 8 is also provided an air bag 18 containing excess electrolyte and gas. In this way, a piece of aluminum-plastic film is first stamped into the first folding part 14 with the air bag 18 and the second folding part 15 with the first cavity 12, of course, it is not limited to the first folding part 14 with the second folding part.
  • a cavity 12 and the second folding part 15 are equipped with an air bag 18, or the first folding part 14 or the second folding part 15 can be equipped with the first cavity 12 and the first folding part 14 and the second folding part 15 are both With a symmetrically distributed air bag 18, the symmetric center of the first folding part 14 and the second folding part 15 is provided with a double fold line 25, and the battery core body 2 is placed in the first cavity 12, and then along the double fold line 25 Fold the first folded portion 14 upwards in half, so that the first folded portion 14 forms the upper aluminum plastic film layer 3, and the second folded portion 15 forms the lower aluminum plastic film layer 4, and the double fold line 25 is formed After removing the straight edge 8, the upper aluminum plastic film layer 3 and the lower aluminum plastic film layer 4 are sealed, and the side where the air bag 18 is located is kept in communication with the outside, and the air bag 18 and the first The cavity 12 is kept in communication, and the first cavity 12 is quickly injected with vacuum through the side of the air bag 18 to accelerate the infiltration of the electrolyte into the cell body 2 and the excess electrolyt
  • the body 2 can effectively reduce the standing infiltration time.
  • the liquid injection gun can be completely inserted into the diversion port to effectively prevent the electrolyte from splashing on the surface of the battery.
  • the electrolyte When the electrolyte is in full contact with the battery cell body, it will face all the outside of the air bag.
  • the above aluminum plastic film layer 3 and the lower aluminum plastic film layer 4 are packaged. Then use a small current to charge the battery body 2, and the battery body 2 begins to be formed. When the lithium ion of the battery is activated and freed, the battery cell will produce carbon dioxide, methane and other gases.
  • the air bag 18 When the battery produces gas, Most of the gas and excess electrolyte will flow into the air bag 18 through the connection between the first cavity 12 and the air bag 18 for storage, effectively ensuring that the size of the battery cell is not deformed during the formation process, and there is no risk of excess sinking. . Then the air bag 18 is pierced to extract the carbon dioxide, methane and other gases produced by the chemical conversion, and at the same time, the excess electrolyte is extracted, so that the first cavity 12 and the air bag are in a vacuum state, and then the battery core is re-encapsulated, and finally Cut out the required shape, such as a circle, to form the round side 9, leaving the straight side 8 uncut.
  • the butterfly bean button type soft battery cell of the utility model has the advantages of simple structure, flexible layout, strong practicability, good safety and can effectively enhance product value.
  • the upper aluminum-plastic film layer 3 is also provided with a accommodating The second cavity 13 of the cell body 2.
  • the edge sealing 7 extends radially outward from any position in the middle section of the vertical surface of the battery core body 2, that is, the top of the upper aluminum-plastic film layer 3 and the lower aluminum-plastic film layer 4 There is a vertical distance between the top and the sealing edge 7, so it is necessary to provide the second cavity 13 in the upper aluminum-plastic film layer 3 to ensure that the battery core is encapsulated in the upper aluminum-plastic film
  • the upper aluminum plastic film layer 3 and the battery core will not interfere with each other and cause the upper aluminum plastic film layer 3 to change Thin or even cracked.
  • the second folding part 15 can also be provided with an air bag 18.
  • the air bag 18 of the first folding part 14 and the air bag 18 of the second folding part 15 overlap after being folded in half, so that the air bag 18 can have more The space accommodates more gas and excess electrolyte.
  • the height of the second cavity 13 can be adjusted according to the vertical distance from the top of the upper aluminum-plastic film layer 3 to the sealing edge 7, and all bending positions include the first cavity 12 and the second cavity 12
  • the bending positions of the cavity 13 and the air bag 18 can be set with R-shaped rounded corners, which can effectively avoid cracks or uneven thickness after vertical stretching.
  • the butterfly bean button type soft-pack battery cell of the present invention please refer to the related figures in Figures 1 to 3, and on the basis of the previous technical solutions, it can also be: the upper aluminum plastic film and the battery core body 2 is provided with a first insulating layer 16, the upper surface of the first insulating layer 16 and the inner wall of the upper aluminum plastic film layer 3 are fixed, the lower surface of the first insulating layer 16 and the battery core body 2 Closely fit, both ends of the first insulating layer 16 extend along the inner side of the upper aluminum-plastic film layer 3 to the inner periphery of the edge seal 7.
  • a first insulating layer 16 is provided on the inner wall of the upper aluminum plastic film layer 3 and the corresponding position of the first cavity 12, or a first insulating layer 16 is provided in the second cavity 13,
  • the first insulating layer 16 is disposed between the upper aluminum-plastic film layer 3 and the battery core body 2. Because the upper aluminum-plastic film layer 3 is relatively thin, adding the first insulating layer 16 can increase The thickness of the upper aluminum-plastic film layer 3 further reduces the adverse consequences of the upper aluminum-plastic film layer 3 being pierced, causing poor side voltage, corrosion of the aluminum layer, and even short circuit.
  • the first insulating layer 16 may be insulating tape or the like.
  • a butterfly bean button type soft-packed battery cell of the present invention please refer to the relevant figures in Figures 1 to 5.
  • the battery core body 2 includes a core infiltrated in the center.
  • the winding piece 19 with electrolyte, the positive lug 5 and the negative lug 6 arranged on the winding piece 19 at intervals, the fixed end of the positive lug 5 and the fixed end of the negative lug 6 are respectively connected to the coil
  • the winding piece 19 is connected, and the free end of the positive electrode lug 5 and the free end of the negative electrode lug 6 both extend through the sealing edge 7 to the outside of the battery core body 2.
  • the free end of the positive electrode lug 5 and the free end of the negative electrode lug 6 may be symmetrically arranged to protrude from both sides of the winding member 19, or may be arranged asymmetrically.
  • the cell body 2 is placed in the first cavity 12, and when the positive electrode lug 5 and the negative electrode lug 6 extend radially from any part of the vertical surface of the cell body 2, the There is the second cavity 13 at the corresponding position of the upper part of the winding member 19.
  • the second cavity 13 may not be provided at the corresponding position of the upper part of the member 19, and then the top or bottom of the battery body 2 extending from the positive electrode ear 5 and the negative electrode ear 6 is connected to the upper aluminum alloy.
  • the plastic film layer 3 is placed in the first cavity 12 accordingly, so that the positive lug 5 and the negative lug 6 extend exactly along the outer circumference of the first cavity 12, and then fold in half along the fold line 25 Aluminum plastic film.
  • a further preferred technical solution is that the free end of the positive electrode ear 5 is fixed in three layers with the upper aluminum plastic film layer 3 and the lower aluminum plastic film layer 4 at the overlapping position with the edge seal 7, so The free end of the negative electrode lug 6 is fixed to the upper aluminum-plastic film layer 3 and the lower aluminum-plastic film layer 4 in a three-layer manner at a position overlapping with the sealing edge 7.
  • the positive electrode ear 5 is in three layers with the upper aluminum plastic film layer 3 and the lower aluminum plastic film layer 4 at the overlapping position with the upper aluminum plastic film layer 3 and the lower aluminum plastic film layer 4.
  • the negative electrode lug 6 is in contact with the upper aluminum plastic film layer 3 and the lower aluminum plastic film layer 4 at the overlapping position with the upper aluminum plastic film layer 3 and the lower aluminum plastic film layer 4.
  • Layered fixation, the positive electrode ear 5 and the negative electrode ear 6 are respectively fixed to the upper aluminum plastic film layer 3 and the lower aluminum plastic film layer 4 to prevent the positive electrode ear 5 and the negative electrode ear 6 from moving at will And pierce other parts and cause undesirable consequences.
  • a further preferred technical solution is that the free end of the positive electrode lug 5 passes through the lug glue 11 and the upper aluminum-plastic film layer 3 and the lower aluminum-plastic film layer 4 at the overlapping position with the sealing edge 7.
  • the free end of the negative electrode lug 6 is fixed in three layers with the upper aluminum plastic film layer 3 and the lower aluminum plastic film layer 4 at the overlapping position with the sealing edge 7 by the lug glue 11 .
  • the insulating effect of the tab glue 11 prevents the positive tab 5 from contacting the upper aluminum plastic film layer 3 and the lower aluminum plastic film layer 4, and the negative tab 6 and the upper aluminum
  • the plastic film layer 3 is in contact with the lower aluminum plastic film layer 4.
  • the butterfly bean button type soft-pack battery cell of the present invention please refer to the relevant figures in Figures 1 to 5.
  • it can also be: the positive electrode ear 5 and the negative electrode ear 6
  • the included angle is set to 5-180°.
  • the positive electrode ear 5 and the negative electrode ear 6 can be arranged at will, so that the direction drawn by the positive electrode ear 5 and the negative electrode ear 6 is the shortest distance from the external device, which is convenient for the positive electrode ear 5 and the
  • the negative electrode ear 6 is connected with the positive and negative electrodes of the external device to reduce the bending probability of the positive electrode ear 5 and the negative electrode ear 6 and thereby extend the service life of the battery core.
  • the winding member 19 is cylindrical or square,
  • the winding member 19 includes a positive electrode sheet 20, a negative electrode sheet 22, and a separator 24.
  • the positive electrode sheet 20 and the negative electrode sheet 22 are alternately laminated and wound to form a cylinder.
  • the separator film 24 is disposed on the positive electrode sheet 20.
  • the negative electrode sheet 22 is cylindrical, so that the space occupied by the winding member 19 is small and space is saved.
  • the winding member 19 is wound around the inside of the cell body 2 round by round, and is formed by winding the positive electrode sheet 20, the separator film 24, and the negative electrode sheet 22.
  • the separator film 24 This is to prevent the positive electrode tab 20 and the negative electrode tab 22 from contacting and short-circuiting.
  • the positive lug 5 is connected to the positive electrode sheet 20, and the negative electrode lug 6 is connected to the negative electrode sheet 22.
  • the specific position can be set according to the actual situation to facilitate the communication between the battery core body 2 and other parts. Connection.
  • a further preferred technical solution is that the positive electrode sheet 20, the negative electrode sheet 22 and the isolation membrane 24 are all fully infiltrated by the electrolyte.
  • a liquid injection gun is used to quickly inject electrolyte into the first cavity 12 through the connection between the air bag 18 and the second cavity 13 to speed up the electrolysis.
  • the infiltration of the wound body by the liquid, the excessive electrolyte infiltrates the battery pole pieces without dead corners, effectively reducing the standing infiltration time, and then the tail of the air bag 18 is sealed twice, and then passed through the positive lug 5 and the negative lug 6
  • the winding member 19 is charged externally with a small current for polarization reaction, and the generated carbon dioxide, methane and other gases enter the air bag 18 through the connection between the first cavity 12 and the air bag 18 for storage, and finally the The excess electrolyte in the first cavity 12 and the excess electrolyte and gas in the gas bag are completely drawn out to make the inside of the gas bag into a vacuum state.
  • the upper aluminum-plastic film layer 3 and the lower aluminum-plastic film layer 4 and The battery core body 2 closely fits at the corresponding position.
  • the positive electrode sheet 20 includes a positive electrode current collector and a coating
  • the negative electrode sheet 22 includes a negative electrode current collector and a negative electrode coating body covering the outside of the current collector.
  • the positive electrode current collector is generally made of aluminum foil, because the aluminum oxide layer on the surface of the aluminum foil is dense, so that the oxidation potential of aluminum is higher than 4.7V during charging, and the negative electrode current collector is generally made of copper foil. At a certain temperature, it does not exist in an alloy phase with lithium, and theoretically does not form an intermetallic compound.
  • the positive electrode coating body is arranged on the outer surface of the positive electrode current collector and the negative electrode is arranged on the outer surface of the negative electrode current collector.
  • the positive electrode coating body is generally made of nickel cobalt lithium aluminate, conductive carbon black, carbon nanotubes, binders and other materials to provide lithium ions for battery charging and discharging.
  • the negative electrode coating body is generally made of Dispersant, graphite, water-based binder, conductive carbon black, conductive agent and other materials are made to carry lithium ions.
  • the winding member 19 is provided with a first Two insulating layers 17, the inner side of the second insulating layer 17 is tightly attached to the outer periphery of the winding member 19, and the outer side of the second insulating layer 17 is tightly attached to the lower aluminum plastic film layer 4.
  • the second insulating layer 17 is arranged between the lower aluminum plastic film layer 4 and the winding member 19, because the lower aluminum plastic film layer 4 is relatively thin, and the second insulating layer 17 is added,
  • the thickness of the lower aluminum-plastic film layer 4 can be increased, thereby reducing the puncture of the lower aluminum-plastic film layer 4, which may cause poor side voltage, corrosion of the aluminum layer, and even short circuit.
  • the first insulating layer 16 may be insulating tape or the like.
  • a further preferred technical solution is that the free end of the positive electrode lug 5 and the free end of the negative electrode lug 6 are respectively bent upward from the inner side of the second insulating layer 17 and bypassing the second insulating layer 17 from the sealing The edge 7 extends to the outside of the sealing edge 7 at the corresponding position. In this way, the positive electrode ear 5 and the negative electrode ear 6 are more regularly attached to the second insulating layer 17, thereby preventing the positive electrode ear 5 and the negative electrode ear 6 from being easily pierced due to irregular edges. Parts of the site.
  • a further preferred technical solution is that the outer side of the second insulating layer 17 is also closely attached to the upper aluminum plastic film layer 3.
  • the edge seal 7 extends radially from the middle section of the vertical surface of the battery core body 2
  • the winding member 19 and the upper aluminum-plastic film layer 3 also have overlapping parts, in order to prevent the upper aluminum
  • the second insulating layer 17 can be added between the upper aluminum plastic film layer 3 and the winding member 19, that is, the height of the second insulating layer 17 is slightly larger than The height of the winding piece 19.
  • the butterfly bean button type soft-packed battery cell of the present invention please refer to the related figures in Figures 1 to 5.
  • the edge sealing 7 is removed from the battery core body 2
  • the vertical surface of the battery core protrudes and extends longitudinally along the vertical surface of the battery core body 2.
  • the sealing edge 7 is closely attached to the vertical surface of the upper aluminum-plastic film layer 3 and the vertical surface of the lower aluminum-plastic film layer 4, so that the volume of the cell is minimized.
  • the outside is made of aluminum Wrapped in plastic film, aluminum plastic film is easy to deform, so the shape is irregular and nearly circular, and it cannot withstand the impact of external force, and the battery safety is poor. Mainly used for low-end products with low requirements.
  • a further preferred technical solution is that the outer periphery of the lower aluminum plastic film layer 4 is provided with a shell 26, the outer periphery of the upper aluminum plastic film layer 3 is provided with an injection molding layer 1, the upper aluminum plastic film layer 3 and the injection molding layer A shielding component is also arranged between 1 and the free end of the positive electrode lug 5 and the free end of the negative electrode lug 6 respectively extend from the injection molding layer 1.
  • the material of the shell 26 can be made of metal or other materials, so the shell 26 and the shielding component can simultaneously shield the electromagnetic field generated by the battery during operation. , Mainly used for high-end products.

Landscapes

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

Abstract

一种蝶豆扣式软包电芯，包括上铝塑膜层（3）、下铝塑膜层（4）和电芯本体（2），所述下铝塑膜层（4）设置有容纳所述电芯本体（2）的第一空腔（12），所述上铝塑膜层（3）和所述下铝塑膜层（4）分别在所述电芯本体（2）的上方和下方对应位置处与所述电芯本体（2）的上部和下部紧密贴合，所述上铝塑膜层（3）和所述下铝塑膜层（4）从所述电芯本体（2）的竖直面向外径向延伸的重叠部分密封热压式固定形成封边（7），所述封边（7）沿所述电芯本体（2）的竖直面延伸至所述电芯本体（2）的顶部，所述封边（7）的外周由直边（8）和圆边（9）首尾相接围设而成，所述上铝塑膜层（3）和所述下铝塑膜层（4）在所述直边（8）对应位置处一体式固定，所述上铝塑膜层（3）在所述圆边（9）远离所述直边（8）的一侧还设置有容纳多余电解液和气体的气袋（18）。该蝶豆扣式软包电芯结构简单、布置灵活、实用性强、安全性高和大大改善成品优率。

Description

一种蝶豆扣式软包电芯 技术领域
本实用新型涉及一种电池技术领域，特别是涉及一种蝶豆扣式软包电芯。
背景技术
目前，锂离子动力电池具有比能量高，循环使用次数多、存储时间长等优点，不仅经常被用在便携式电子设备上如移动电话、数码摄像机和笔记本电脑上，而且被越来越多的用在电动汽车、电动自行车以及电动工具等大中型电动设备方面，因此对锂离子动力电池的性能要求越来越高。
对于软包锂离子电池，以其设计简单、安全、能量密度高等特点受到市场欢迎，但是现有技术的软包锂离子电池在其制作工艺中，首先将电芯装入铝塑膜中，一封后再注入电解液，产生极化反应，当电池的锂离子在激活游离的过程，电芯会产生二氧化碳、甲烷等气体无法排出，会导致极片膨胀，卷绕体中的间隙加大，电解液沉积，从而导致电池尺寸形变，正负极片贴合不紧，影响SEI膜成形，容易析锂，导致电芯循环差，电解液外泄，内部短路等不安全隐患。
发明内容
本实用新型是为了解决现有技术中的不足而完成的，本实用新型的目的是提供一种结构简单、布置灵活、实用性强、安全性好和大大改善成品优率的蝶豆扣式软包电芯。
本实用新型的一种蝶豆扣式软包电芯，包括上铝塑膜层、下铝塑膜层和电芯本体，所述下铝塑膜层设置有容纳所述电芯本体的第一空腔，所述上铝塑膜层和所述下铝塑膜层分别在所述电芯本体的上方和下方对应位置处与所述电芯本体的上部和下部紧密贴合，所述上铝塑膜层和所述下铝塑膜层从所述电芯本体的竖直面向外径向延伸的重叠部分密封热压式固定形成封边，所述封边沿所述电芯本体的竖直面延伸至所述电芯本体的顶部，所述封边的外周由直边和圆边首尾相接围设而成，所述上铝塑膜层和所述下铝塑膜层在所述直边对应位置处一体式固定，所述上铝塑膜层在所述圆边远离所述直边的一侧还设置有容纳 多余电解液和气体的气袋。
本实用新型的一种蝶豆扣式软包电芯还可以是：
所述上铝塑膜层也设置有容纳所述电芯本体的第二空腔。
所述上铝塑膜和所述电芯本体之间设置有第一绝缘层，所述第一绝缘层的上表面和所述上铝塑膜层的内壁固定，所述第一绝缘层的下表面与所述电芯本体紧密贴合，所述第一绝缘层的两端均沿所述上铝塑膜层的内侧延伸至所述封边的内周。
所述电芯本体包括卷设于中心浸润有电解液的卷绕件、间隔设置于所述卷绕件上的正极耳和负极耳，所述正极耳的固定端和所述负极耳的固定端分别与所述卷绕件连接，所述正极耳的自由端和所述负极耳的自由端均穿过所述封边延伸至所述电芯本体的外侧。
所述正极耳的自由端在与所述封边的重叠位置处与所述上铝塑膜层和所述下铝塑膜层三层式固定，所述负极耳的自由端在与所述封边的重叠位置处与所述上铝塑膜层和所述下铝塑膜层三层式固定。
所述正极耳与所述负极耳的夹角设置为5-180°。
所述卷绕件呈圆柱状或方形，所述卷绕件包括正极片、负极片和隔离膜，所述正极片和所述负极片交替层叠绕制形成圆柱体，所述隔离膜设置于所述正极片和所述负极片之间。
所述正极片、所述负极片和所述隔离膜均由所述电解液充分浸润。
所述正极片包括正极集流体和包覆在所述集流体外部的正极涂层体，所述负极片包括负极集流体和包覆在所述集流体外部的负极涂层体。
所述卷绕件的外周上设置有第二绝缘层，所述第二绝缘层的内侧与所述卷绕件的外周紧密贴合，所述第二绝缘层的外侧与所述下铝塑膜层均紧密贴合。
本实用新型的一种蝶豆扣式软包电芯，包括上铝塑膜层、下铝塑膜层和电芯本体，所述下铝塑膜层设置有容纳所述电芯本体的第一空腔，所述上铝塑膜层和所述下铝塑膜层分别在所述电芯本体的上方和下方对应位置处与所述电芯本体的上部和下部紧密贴合，所述上铝塑膜层和所述下铝塑膜层从所述电芯本体的竖直面向外径向延伸的重叠部分密封热压式固定形成封边，所述封边沿所述电芯本体的竖直面延伸至所述电芯本体的顶部，所述封边的外周由直边和圆边首尾相接围设而成，所述上铝塑膜层和所述下铝塑膜层在所述直边对应位置处一体式固定，所述上铝塑膜层在所述圆边远离所述直边的一侧还设置有容纳 多余电解液和气体的气袋。这样，先将一张铝塑膜冲压成带气袋的第一折叠部和带所述第一空腔的第二折叠部，当然也不限于第一折叠部带所述第一空腔和第二折叠部带气袋，也可以是第一折叠部或者第二折叠部带所述第一空腔以及第一折叠部和第二折叠部均带对称分布的气袋，第一折叠部和第二折叠部的对称中心设置有对折线，将所述电芯本体放入所述第一空腔内，然后沿对折线将第一折叠部向上对折，这样第一折叠部便形成了所述上铝塑膜层，第二折叠部便形成了所述下铝塑膜层，对折线便形成了所述直边，而后将所述上铝塑膜层和所述下铝塑膜层进行一封，气袋所在的一侧和外界保持连通，气袋和所述第一空腔保持连通，通过气袋一侧向所述第一空腔内真空快速注液，加快电解液对所述电芯本体的浸润，过量的电解液无死角浸润所述电芯本体可以有效减少静置浸润时间，注液枪可以完全插入到导流口内可以有效避免电解液溅射到电池表面，当电解液和所述电芯本体充分接触后，对气袋外侧的所述上铝塑膜层和所述下铝塑膜层进行封装。然后使用小电流对所述电芯本体充电，所述电芯本体开始进行化成，当电池的锂离子在激活游离的过程，电芯会产生二氧化碳、甲烷等气体，当电池产气后，大部分气体及多余的电解液将通过所述第一空腔与气袋的连通处引流入气袋中储存，有效保证在化成过程中电芯的尺寸无形变，无多余沉液风险。然后将气袋扎破把化成产生的二氧化碳，甲烷等气体抽出，同时把多余的电解液抽出，进而对电芯进行二次封装，最后裁剪出需要的形状比如圆形等，进而形成所述圆边，保留所述直边不裁剪。本实用新型的一种蝶豆扣式软包电芯，相对于现有技术的优点是：结构简单、布置灵活、实用性强、安全性好和大大改善成品优率。
附图说明
图1本实用新型一种蝶豆扣式软包电芯实施例爆炸图。
图2本实用新型一种蝶豆扣式软包电芯正视图。
图3本实用新型一种蝶豆扣式软包电芯图2A-A剖面图。
图4本实用新型一种蝶豆扣式软包电芯实施例一立体图。
图5本实用新型一种蝶豆扣式软包电芯实施例二立体图。
图号说明
1…注塑层         2…电芯本体         3…上铝塑膜层
4…下铝塑膜层     5…正极耳           6…负极耳
7…封边            8…直边             9…圆边
11…极耳胶         12…第一空腔       13…第二空腔
14…第一折叠部     15…第二折叠部     16…第一绝缘层
17…第二绝缘层     18…气袋           19…卷绕件
20…正极片         22…负极片         24…隔离膜
25…对折线         26…外壳
具体实施方式
下面结合附图的图1至图5对本实用新型的一种蝶豆扣式软包电芯作进一步详细说明。
本实用新型的一种蝶豆扣式软包电芯，请参考图1至图5中相关各图，包括上铝塑膜层3、下铝塑膜层4和电芯本体2，所述下铝塑膜层4设置有容纳所述电芯本体2的第一空腔12，所述上铝塑膜层3和所述下铝塑膜层4分别在所述电芯本体2的上方和下方对应位置处与所述电芯本体2的上部和下部紧密贴合，所述上铝塑膜层3和所述下铝塑膜层4从所述电芯本体2的竖直面向外径向延伸的重叠部分密封热压式固定形成封边7，所述封边7沿所述电芯本体2的竖直面延伸至所述电芯本体2的顶部，所述封边7的外周由直边8和圆边9首尾相接围设而成，所述上铝塑膜层3和所述下铝塑膜层4在所述直边8对应位置处一体式固定，所述上铝塑膜层3在所述圆边9远离所述直边8的一侧还设置有容纳多余电解液和气体的气袋18。这样，先将一张铝塑膜冲压成带气袋18的第一折叠部14和带所述第一空腔12的第二折叠部15，当然也不限于第一折叠部14带所述第一空腔12和第二折叠部15带气袋18，也可以是第一折叠部14或者第二折叠部15带所述第一空腔12以及第一折叠部14和第二折叠部15均带对称分布的气袋18，第一折叠部14和第二折叠部15的对称中心设置有对折线25，将所述电芯本体2放入所述第一空腔12内，然后沿对折线25将第一折叠部14向上对折，这样第一折叠部14便形成了所述上铝塑膜层3，第二折叠部15便形成了所述下铝塑膜层4，对折线25便形成了所述直边8，而后将所述上铝塑膜层3和所述下铝塑膜层4进行一封，气袋18所在的一侧和外界保持连通，气袋18和所述第一空腔12保持连通，通过气袋18一侧向所述第一空腔12内真空快速注液，加快电解液对所述电芯本体2的浸润，过量的电解液无死角浸润所述电芯本体2可以有效减少静置浸润时间，注液枪可以完全插入到 导流口内可以有效避免电解液溅射到电池表面，当电解液和所述电芯本体充分接触后，对气袋外侧的所述上铝塑膜层3和所述下铝塑膜层4进行封装。然后使用小电流对所述电芯本体2充电，所述电芯本体2开始进行化成，当电池的锂离子在激活游离的过程，电芯会产生二氧化碳，甲烷等气体，当电池产气后，大部分气体及多余的电解液将通过所述第一空腔12与气袋18的连通处引流入气袋18中储存，有效保证在化成过程中电芯的尺寸无形变，无多余沉液风险。然后将气袋18扎破把化成产生的二氧化碳，甲烷等气体抽出，同时把多余的电解液抽出，使得所述第一空腔12和气袋成真空状态，进而对电芯进行二次封装，最后裁剪出需要的形状比如圆形等，进而形成所述圆边9，保留所述直边8不裁剪。本实用新型的一种蝶豆扣式软包电芯，相对于现有技术的优点是：结构简单、布置灵活、实用性强、安全性好和可以有效提升产品价值。
本实用新型的一种蝶豆扣式软包电芯，请参考图1至图3中相关各图，在前面技术方案的基础上具体可以是：所述上铝塑膜层3也设置有容纳所述电芯本体2的第二空腔13。这样，若所述封边7由所述电芯本体2的竖直面的中段任意位置向外径向延伸，即所述上铝塑膜层3的顶部和所述下铝塑膜层4的顶部均与所述封边7有垂直距离，那么在所述上铝塑膜层3设置所述第二空腔13是有必要的，可以保证将所述电芯封装在所述上铝塑膜层3和所述下铝塑膜层4之间的时候，所述上铝塑膜层3和所述电芯之间不会因为互相有干涉而造成所述上铝塑膜层3的拉扯变薄甚至破裂。当然，在第二折叠部15也可以设置有气袋18，第一折叠部14的气袋18和第二折叠部15的气袋18在对折后重叠，这样，气袋18可以有更多的空间容纳更多的气体和多余的电解液。所述第二空腔13的高度可以根据所述上铝塑膜层3的顶部到所述封边7的垂直距离来调节，所有弯折位置包括所述第一空腔12、所述第二空腔13和气袋18的弯折位置都可以设置R形圆角，这样可有效避开垂直拉伸后的破裂或厚薄不均匀。
本实用新型的一种蝶豆扣式软包电芯，请参考图1至图3中相关各图，在前面技术方案的基础上还可以是：所述上铝塑膜和所述电芯本体2之间设置有第一绝缘层16，所述第一绝缘层16的上表面和所述上铝塑膜层3的内壁固定，所述第一绝缘层16的下表面与所述电芯本体2紧密贴合，所述第一绝缘层16的两端均沿所述上铝塑膜层3的内侧延伸至所述封边7的内周。这样，在所述上铝塑膜层3的内壁和所述第一空腔12对应位置设置第一绝缘层16，或者是在所述第二空腔13内设置一层第一绝缘层16，所述第一绝缘层16设置在所述 上铝塑膜层3和所述电芯本体2之间，因为所述上铝塑膜层3比较薄，增加所述第一绝缘层16，可以增加所述上铝塑膜层3的厚度，进而减少所述上铝塑膜层3被刺破而引起边电压不良和腐蚀铝层，甚至短路等不良后果。所述第一绝缘层16可以是绝缘胶纸等。
本实用新型的一种蝶豆扣式软包电芯，请参考图1至图5中相关各图，在前面技术方案的基础上还可以是：所述电芯本体2包括卷设于中心浸润有电解液的卷绕件19、间隔设置于所述卷绕件19上的正极耳5和负极耳6，所述正极耳5的固定端和所述负极耳6的固定端分别与所述卷绕件19连接，所述正极耳5的自由端和所述负极耳6的自由端均穿过所述封边7延伸至所述电芯本体2的外侧。这样，所述正极耳5的自由端和所述负极耳6的自由端可以对称设置为分别从所述卷绕件19的两侧伸出，也可以不对称设置。将所述电芯本体2置于所述第一空腔12内，当所述正极耳5和所述负极耳6从所述电芯本体2的竖直面任意部位径向延伸时，所述卷绕件19的上部对应位置处有所述第二空腔13，若所述正极耳5和所述负极耳6从所述电芯本体2的顶部或底部径向延伸时，所述卷绕件19的上部对应位置处可以不设置所述第二空腔13，然后将有所述正极耳5和所述负极耳6延伸出的所述电芯本体2的顶部或者底部与所述上铝塑膜层3相对应放入所述第一空腔12内，这样，所述正极耳5和所述负极耳6正好沿所述第一空腔12的外周延伸，然后再沿对折线25对折铝塑膜。更进一步优选的技术方案为所述正极耳5的自由端在与所述封边7的重叠位置处与所述上铝塑膜层3和所述下铝塑膜层4三层式固定，所述负极耳6的自由端在与所述封边7的重叠位置处与所述上铝塑膜层3和所述下铝塑膜层4三层式固定。这样，所述正极耳5在与所述上铝塑膜层3和所述下铝塑膜层4的重叠位置处与所述上铝塑膜层3和所述下铝塑膜层4三层式固定，所述负极耳6在与所述上铝塑膜层3和所述下铝塑膜层4的重叠位置处与所述上铝塑膜层3和所述下铝塑膜层4三层式固定，所述正极耳5和所述负极耳6分别与所述上铝塑膜层3和所述下铝塑膜层4固定，防止所述正极耳5和所述负极耳6随意移动而将其他零部件刺穿而引起不良后果。更进一步优选的技术方案为所述正极耳5的自由端在与所述封边7的重叠位置处通过极耳胶11与所述上铝塑膜层3和所述下铝塑膜层4三层式固定，所述负极耳6的自由端在与所述封边7的重叠位置处通过极耳胶11与所述上铝塑膜层3和所述下铝塑膜层4三层式固定。这样，所述极耳胶11的绝缘作用杜绝了所述正极耳5与所述上铝 塑膜层3和所述下铝塑膜层4的接触，以及所述负极耳6与所述上铝塑膜层3和所述下铝塑膜层4的接触。
本实用新型的一种蝶豆扣式软包电芯，请参考图1至图5中相关各图，在前面技术方案的基础上还可以是：所述正极耳5与所述负极耳6的夹角设置为5-180°。这样，可以随意布置所述正极耳5和所述负极耳6，使所述正极耳5和所述负极耳6所引出的方向与外接的设备的距离最短，方便所述正极耳5与所述负极耳6和外接的设备的正负极相接，以减少所述正极耳5和所述负极耳6的弯折几率，进而延长所述电芯的使用寿命。
本实用新型的一种蝶豆扣式软包电芯，请参考图1至图5中相关各图，在前面技术方案的基础上还可以是：所述卷绕件19呈圆柱状或方形，所述卷绕件19包括正极片20、负极片22和隔离膜24，所述正极片20和所述负极片22交替层叠绕制形成圆柱体，所述隔离膜24设置于所述正极片20和所述负极片22之间。这样，所述卷绕件19呈圆柱状，使得所述卷绕件19所占有的空间小，节省了空间。所述卷绕件19一圈一圈绕设在所述电芯本体2的内部，其由所述正极片20、所述隔离膜24和所述负极片22卷绕形成，所述隔离膜24是为了防止所述正极片20和所述负极片22接触而短路的作用。所述正极耳5连接于所述正极片20上，所述负极耳6连接于所述负极片22上，具体位置可以根据实际情况进行设置，方便所述电芯本体2与其他零部件之间的连接。更进一步优选的技术方案为所述正极片20、所述负极片22和所述隔离膜24均由所述电解液充分浸润。这样，在对电芯进行一封后，在真空环境下用注液枪通过气袋18和所述第二空腔13的连通处向所述第一空腔12内快速注入电解液，加快电解液对卷绕体的浸润，过量的电解液无死角浸润电池极片，有效减少静置浸润时间，再将气袋18的尾部进行二封，然后通过所述正极耳5和所述负极耳6在外部用小电流对所述卷绕件19充电进行极化反应，产生的二氧化碳、甲烷等气体，通过所述第一空腔12和气袋18的连通处进入气袋18储存，最后把所述第一空腔12内的多余电解液和气袋内的多余电解液和气体完全抽出使气袋内成真空状态，这时所述上铝塑膜层3和所述下铝塑膜层4分别和所述电芯本体2在对应位置处紧密贴合。
本实用新型的一种蝶豆扣式软包电芯，请参考图1至图5中相关各图，在前面技术方案的基础上还可以是：所述正极片20包括正极集流体和包覆在所述集流体外部的正极涂层体，所述负极片22包括负极集流体和包覆在所述集流体 外部的负极涂层体。这样，所述正极集流体一般由铝箔制成，因为铝箔表面的氧化铝层很致密，使得在充电时铝的氧化电位高于4.7V，而所述负极集流体一般由铜箔制成，由于一定温度下其与锂无合金相存在，理论上不会形成金属间化合物，然后分别在所述正极集流体外表面设置所述正极涂层体和在所述负极集流体外表面设置所述负极涂层体，所述正极涂层体一般由镍钴铝酸锂、导电碳黑、碳纳米管、粘结剂等材料制成用于提供电池充放电的锂离子所述负极涂层体一般由分散剂、石墨、水性粘结剂、导电碳黑、导电剂等材料制成用于承载锂离子的嵌入。
本实用新型的一种蝶豆扣式软包电芯，请参考图1至图5中相关各图，在前面技术方案的基础上还可以是：所述卷绕件19的外周上设置有第二绝缘层17，所述第二绝缘层17的内侧与所述卷绕件19的外周紧密贴合，所述第二绝缘层17的外侧与所述下铝塑膜层4均紧密贴合。这样，所述第二绝缘层17设置在所述下铝塑膜层4和所述卷绕件19之间，因为所述下铝塑膜层4比较薄，增加所述第二绝缘层17，可以增加所述下铝塑膜层4的厚度，进而减少所述下铝塑膜层4被刺破而引起边电压不良和腐蚀铝层，甚至短路等不良后果。所述第一绝缘层16可以是绝缘胶纸等。进一步优选的技术方案为所述正极耳5的自由端和所述负极耳6的自由端分别从所述第二绝缘层17的内侧向上弯折绕过所述第二绝缘层17从所述封边7对应位置处延伸到所述封边7的外侧。这样，所述正极耳5和所述负极耳6更加有规则的与所述第二绝缘层17贴合，进而避免所述正极耳5和所述负极耳6因为边缘不规则更容易刺破其他部位的零件。更进一步优选的技术方案为所述第二绝缘层17的外侧还与所述上铝塑膜层3紧密贴合。这样，若所述封边7从所述电芯本体2的竖直面中段径向延伸时，所述卷绕件19和所述上铝塑膜层3也有重叠部分，为了防止所述上铝塑膜层3被刺破，可以在所述上铝塑膜层3和所述卷绕件19之间加入所述第二绝缘层17，也就是所述第二绝缘层17的高度要略微大于所述卷绕件19的高度。
本实用新型的一种蝶豆扣式软包电芯，请参考图1至图5中相关各图，在前面技术方案的基础上还可以是：所述封边7从所述电芯本体2的竖直面伸出并沿所述电芯本体2的竖直面纵向延伸。这样，所述封边7与所述上铝塑膜层3的竖直面和所述下铝塑膜层4的竖直面紧密贴合，使电芯体积尽量减小.由于外部是由铝塑膜包裹，铝塑膜容易变形，因此外形是不规则的近圆形，同时不能承受外力的冲击，电池安全性差。主要用于要求不高的中低端产品上。更 进一步优选的技术方案为所述下铝塑膜层4外周设置有外壳26，所述上铝塑膜层3的外周设置有注塑层1，所述上铝塑膜层3和所述注塑层1之间还设置有屏蔽部件，所述正极耳5的自由端和所述负极耳6的自由端分别从所述注塑层1伸出。这样，可以承受一定的外力冲击，电池安全性高，并且所述外壳26的材质可以为金属等材料制成，因此所述外壳26和所述屏蔽部件可以同时能屏蔽掉电池工作时产生的电磁场，主要用于高端产品上。
上述仅对本实用新型中的几种具体实施例加以说明，但并不能作为本实用新型的保护范围，凡是依据本实用新型中的设计精神所作出的等效变化或修饰或等比例放大或缩小等，均应认为落入本实用新型的保护范围。

Claims (10)

  1. 一种蝶豆扣式软包电芯，其特征在于：包括上铝塑膜层、下铝塑膜层和电芯本体，所述下铝塑膜层设置有容纳所述电芯本体的第一空腔，所述上铝塑膜层和所述下铝塑膜层分别在所述电芯本体的上方和下方对应位置处与所述电芯本体的上部和下部紧密贴合，所述上铝塑膜层和所述下铝塑膜层从所述电芯本体的竖直面向外径向延伸的重叠部分密封热压式固定形成封边，所述封边沿所述电芯本体的竖直面延伸至所述电芯本体的顶部，所述封边的外周由直边和圆边首尾相接围设而成，所述上铝塑膜层和所述下铝塑膜层在所述直边对应位置处一体式固定，所述上铝塑膜层在所述圆边远离所述直边的一侧还设置有容纳多余电解液和气体的气袋。
  2. 根据权利要求1所述的一种蝶豆扣式软包电芯，其特征在于：所述上铝塑膜层也设置有容纳所述电芯本体的第二空腔。
  3. 根据权利要求1所述的一种蝶豆扣式软包电芯，其特征在于：所述上铝塑膜和所述电芯本体之间设置有第一绝缘层，所述第一绝缘层的上表面和所述上铝塑膜层的内壁固定，所述第一绝缘层的下表面与所述电芯本体紧密贴合，所述第一绝缘层的两端均沿所述上铝塑膜层的内侧延伸至所述封边的内周。
  4. 根据权利要求1-3任意一项权利要求所述的一种蝶豆扣式软包电芯，其特征在于：所述电芯本体包括卷设于中心浸润有电解液的卷绕件、间隔设置于所述卷绕件上的正极耳和负极耳，所述正极耳的固定端和所述负极耳的固定端分别与所述卷绕件连接，所述正极耳的自由端和所述负极耳的自由端均穿过所述封边延伸至所述电芯本体的外侧。
  5. 根据权利要求4所述的一种蝶豆扣式软包电芯，其特征在于：所述正极耳的自由端在与所述封边的重叠位置处与所述上铝塑膜层和所述下铝塑膜层三层式固定，所述负极耳的自由端在与所述封边的重叠位置处与所述上铝塑膜层和所述下铝塑膜层三层式固定。
  6. 根据权利要求4所述的一种蝶豆扣式软包电芯，其特征在于：所述正极耳与所述负极耳的夹角设置为5-180°。
  7. 根据权利要求4所述的一种蝶豆扣式软包电芯，其特征在于：所述卷绕件呈圆柱状或方形，所述卷绕件包括正极片、负极片和隔离膜，所述正极片和所述负极片交替层叠绕制形成圆柱体，所述隔离膜设置于所述正极片和所述负 极片之间。
  8. 根据权利要求7所述的一种蝶豆扣式软包电芯，其特征在于：所述正极片、所述负极片和所述隔离膜均由所述电解液充分浸润。
  9. 根据权利要求7所述的一种蝶豆扣式软包电芯，其特征在于：所述正极片包括正极集流体和包覆在所述集流体外部的正极涂层体，所述负极片包括负极集流体和包覆在所述集流体外部的负极涂层体。
  10. 根据权利要求7所述的一种蝶豆扣式软包电芯，其特征在于：所述卷绕件的外周上设置有第二绝缘层，所述第二绝缘层的内侧与所述卷绕件的外周紧密贴合，所述第二绝缘层的外侧与所述下铝塑膜层均紧密贴合。
PCT/CN2020/070767 2019-12-06 2020-01-07 一种蝶豆扣式软包电芯 WO2021109315A1 (zh)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201922170521.2 2019-12-06
CN201922170521.2U CN210956892U (zh) 2019-12-06 2019-12-06 一种蝶豆扣式软包电芯

Publications (1)

Publication Number Publication Date
WO2021109315A1 true WO2021109315A1 (zh) 2021-06-10

Family

ID=71376706

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2020/070767 WO2021109315A1 (zh) 2019-12-06 2020-01-07 一种蝶豆扣式软包电芯

Country Status (2)

Country Link
CN (1) CN210956892U (zh)
WO (1) WO2021109315A1 (zh)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111193056A (zh) * 2019-11-29 2020-05-22 惠州市金合电子有限公司 一种碟式电池及其制备方法
EP4411906A1 (en) * 2023-02-01 2024-08-07 Cellforce Group GmbH Method for manufacturing a battery cell with a pouch housing

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114156518A (zh) * 2020-09-07 2022-03-08 曙鹏科技（深圳）有限公司 软包纽扣电池的封装方法
CN112713340A (zh) * 2020-12-30 2021-04-27 深圳市齐得隆电子有限公司 一种新型大容量固态聚合物锂离子电池结构及制造方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103730608A (zh) * 2012-10-11 2014-04-16 微宏动力系统（湖州）有限公司 软包电池、软包电池封口机及软包电池封口方法
CN203660009U (zh) * 2013-12-23 2014-06-18 深圳市量能科技有限公司 一种电子烟用聚合物软包装锂离子电池及其电芯
CN104900918A (zh) * 2015-04-27 2015-09-09 东莞市安德丰电池有限公司 一种锂离子电池制备方法
CN105702885A (zh) * 2016-04-06 2016-06-22 东莞市安德丰电池有限公司 一种锂离子电池的封装结构及其封装方法、化成方法
CN109273776A (zh) * 2018-09-19 2019-01-25 惠州亿纬锂能股份有限公司 一种电芯膜袋封装方法、电池制备方法及电池

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103730608A (zh) * 2012-10-11 2014-04-16 微宏动力系统（湖州）有限公司 软包电池、软包电池封口机及软包电池封口方法
CN203660009U (zh) * 2013-12-23 2014-06-18 深圳市量能科技有限公司 一种电子烟用聚合物软包装锂离子电池及其电芯
CN104900918A (zh) * 2015-04-27 2015-09-09 东莞市安德丰电池有限公司 一种锂离子电池制备方法
CN105702885A (zh) * 2016-04-06 2016-06-22 东莞市安德丰电池有限公司 一种锂离子电池的封装结构及其封装方法、化成方法
CN109273776A (zh) * 2018-09-19 2019-01-25 惠州亿纬锂能股份有限公司 一种电芯膜袋封装方法、电池制备方法及电池

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111193056A (zh) * 2019-11-29 2020-05-22 惠州市金合电子有限公司 一种碟式电池及其制备方法
EP4411906A1 (en) * 2023-02-01 2024-08-07 Cellforce Group GmbH Method for manufacturing a battery cell with a pouch housing
WO2024160964A1 (en) * 2023-02-01 2024-08-08 Cellforce Group Gmbh Method for manufacturing a battery cell with a pouch housing

Also Published As

Publication number Publication date
CN210956892U (zh) 2020-07-07

Similar Documents

Publication Publication Date Title
WO2021109315A1 (zh) 一种蝶豆扣式软包电芯
US8679675B2 (en) Battery including a member configured to prevent a short circuit
EP2811571B1 (en) Secondary battery having improved energy density
WO2022228580A1 (zh) 极片及其制备方法、锂离子电池
CN103413975B (zh) 镍钴锰酸锂圆柱型高倍率电池及其制备方法
CN203800133U (zh) 卷绕式电芯及电化学装置
CN201146222Y (zh) 新型叠片式锂离子二次电池
JP2000260478A (ja) 非水系二次電池
CN202282423U (zh) 环形锂离子动力电池
CN111180787A (zh) 一种锂离子电池以及制作方法
CN113851793A (zh) 一种多极耳电芯、电池及电池制作方法
JP5415009B2 (ja) 蓄電デバイスモジュール
JP2011076785A (ja) 角形リチウム二次電池
CN203434247U (zh) 镍钴锰酸锂圆柱型高倍率电池
WO2024001698A1 (zh) 电化学装置及电子装置
CN209947932U (zh) 一种无负极耳叠片纽扣电池
JPH11154500A (ja) 非水電解質二次電池
CN207474594U (zh) 一种锂离子圆柱电池
CN104766990A (zh) 一种锂离子电池及其制备方法
JP7225287B2 (ja) 二次電池および二次電池の製造方法
WO2019047107A1 (zh) 锂金属电池
CN211208593U (zh) 一种锂离子电池
JP4168263B2 (ja) 非水系二次電池
CN219759677U (zh) 卷芯及具有该卷芯的电芯
CN216213958U (zh) 一种多极耳电芯及电池

Legal Events

Date Code Title Description
NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 20897359

Country of ref document: EP

Kind code of ref document: A1