WO2022051914A1 - 一种电化学装置及电子装置 - Google Patents
一种电化学装置及电子装置 Download PDFInfo
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Images
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/112—Monobloc comprising multiple compartments
-
- 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
- H01M50/105—Pouches or flexible bags
-
- 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
- H01M50/116—Primary casings; Jackets or wrappings characterised by the material
- H01M50/117—Inorganic material
- H01M50/119—Metals
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/116—Primary casings; Jackets or wrappings characterised by the material
- H01M50/121—Organic material
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/172—Arrangements of electric connectors penetrating the casing
- H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
- H01M50/178—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for pouch or flexible bag cells
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/183—Sealing members
- H01M50/186—Sealing members characterised by the disposition of the sealing members
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/54—Connection of several leads or tabs of plate-like electrode stacks, e.g. electrode pole straps or bridges
-
- 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
- H01M50/543—Terminals
- H01M50/547—Terminals characterised by the disposition of the terminals on the cells
- H01M50/55—Terminals characterised by the disposition of the terminals on the cells on the same side of the cell
-
- 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 present application relates to the field of electrochemistry, and in particular, to an electrochemical device and an electronic device using the electrochemical device.
- Lithium-ion batteries have many advantages such as large volume and mass energy density, long cycle life, low self-discharge rate, small size, and light weight, and have a wide range of applications in the field of consumer electronics. With the rapid development of electric vehicles and mobile electronic devices in recent years, people have higher and higher requirements for battery energy density, safety, cycle performance, etc., and look forward to the emergence of new lithium-ion batteries with comprehensive performance improvements.
- the purpose of the present application is to provide an electrochemical device and an electronic device, which realizes a high voltage output and improves the welding reliability of the series-parallel lugs and the packaging reliability of the lug area.
- a first aspect of the present application provides an electrochemical device, which includes at least two electrode assemblies and a packaging case, wherein the electrode assemblies are respectively disposed in independent cavities in the packaging case;
- Each electrode assembly includes two tabs of opposite polarity, wherein at least one tab of one electrode assembly is connected to one of the two tabs of the other electrode assembly, and the connected two tabs are sealed along the seal
- the orthographic projection of the thickness direction Z has the tab overlap area
- the ratio of the overlapping width O1 of the two connected tabs to the width W1 of any tab is 40% ⁇ 100%
- the overlapping width O1 is the overlapping width of the two connected tabs viewed along the sealing thickness direction Z, at the outer edge of the sealing of the packaging case, along the sealing length direction X;
- the tab width W1 is the width of any one of the two connected tabs, viewed along the seal thickness direction Z, at the seal outer edge of the packaging case and along the seal length direction X.
- tab glue is provided on each of the two connected tabs, and at the outer edge of the seal of the packaging case, along the seal length direction X, the tabs are provided on the tabs.
- the width of the polar ear rubber exceeds both sides of the polar ear, and the ratio of the shoulder width D2 of the polar ear rubber to the width W1 of the polar ear is D2/W1 ⁇ 1/60;
- the shoulder width D2 of the tab glue is the distance that one side of the tab glue exceeds the edge of the tab on the same side along the X direction at the outer edge of the seal of the packaging case.
- the orthographic projection of the tab glue on the two connected tabs along the seal thickness direction Z has a tab glue overlapping area, and the overlapping width O2 of the tab glue accounts for The ratio of the width W2 of any tab glue is 40% ⁇ 100%;
- the overlapping width O2 of the tab glue is observed along the sealing thickness direction Z, and at the outer edge of the sealing of the packaging shell, along the sealing length direction X, the overlapping width of the tab glue;
- the width W2 of the tab glue is the width of any one of the tab glues, viewed along the seal thickness direction Z, at the sealing outer edge of the packaging case, along the seal length direction X.
- the distance between the two connected tabs is D5; the two connected tabs have a connecting area, and the connected
- the length of the tab between the area and the outer edge of the package shell seal is D6; the relationship between D5 and D6 satisfies: 0 ⁇ D5/D6 ⁇ 1.7.
- 3mm ⁇ D6 ⁇ 30mm In some embodiments of the first aspect of the present application, 3mm ⁇ D6 ⁇ 30mm.
- 0.1mm ⁇ D5 ⁇ (H1+H2)/2+5mm wherein H1 and H2 are the thicknesses of two adjacent electrode assemblies respectively, and H1 and H2 may be the same or different .
- the area S1 of the connection region is 1 mm 2 to 200 mm 2 .
- the distance of the tab glue beyond the upper edge of the packaging shell along the sealing width direction Y is 0.2mm ⁇ D1 ⁇ 5mm, and the tab glue
- the thickness of the electrode is 0.1mm ⁇ D3 ⁇ 3mm, and the thickness of the tab is 0.2mm ⁇ D4 ⁇ 5mm.
- the two connected tabs are two polar tabs with opposite polarities.
- the electrode assembly has tabs protruding from the packaging shell from different directions.
- the electrochemical device further comprises a separator between the electrode assemblies, the separator having a thickness of 2 ⁇ m to 100 ⁇ m.
- the structure of the electrode assembly includes at least one of a wound structure and a laminated structure.
- the packaging case includes at least one of an aluminum-plastic film, an aluminum case, a steel case, and a plastic case.
- a second aspect of the present application provides an electronic device comprising the electrochemical device provided in the first aspect of the present application.
- the electrochemical device provided by the present application achieves a high voltage output through the internal series connection of a plurality of electrode assemblies, and at the same time has the functions of reducing the total heat production and temperature rise of the electrochemical device.
- Different electrode assemblies are arranged in separate cavities to ensure that the electrode assemblies are in a liquid electrolyte environment, avoiding the problem of internal short circuits and the problem of electrolyte decomposition under high pressure, thereby improving the safety performance of the electrochemical device.
- the reliability of the connection is improved, the effective power output and over-current capability of the high-voltage electrochemical device are ensured, the heat generated by the tabs and the power consumption are reduced, and the heat of the tabs can be avoided.
- the ear gel softens or melts, improving the packaging reliability of the electrochemical device.
- the packaging reliability of the electrochemical device with high output voltage is further improved by drawing the tabs out of the packaging case, designing and regulating the relative positions of the tabs, and designing the consistency of the tabs.
- FIG. 1 is a schematic structural diagram of an electrochemical device in an embodiment of the present application.
- FIG. 2 is a schematic structural diagram of an electrochemical device in another embodiment of the present application.
- FIG. 3 is a schematic structural diagram of an electrochemical device in yet another embodiment of the present application.
- Fig. 4 is the partial structure schematic diagram of the left side view of Fig. 2;
- Fig. 5 is another partial structure schematic diagram of the left side view of Fig. 2;
- FIG. 6 is another partial structural schematic diagram of the left side view of FIG. 2 .
- the electrochemical device of the present application can be any electrochemical device known to those skilled in the art, such as lithium ion batteries, sodium ion batteries, magnesium ion batteries, supercapacitors, etc.
- the following description takes lithium ion batteries as an example. It should be understood by those skilled in the art that the following descriptions are only examples and do not limit the protection scope of the present application.
- the application provides an electrochemical device, which includes at least two electrode assemblies and a packaging case, wherein the electrode assemblies are respectively disposed in independent cavities in the packaging case;
- Each electrode assembly includes two tabs of opposite polarity, wherein at least one tab of one electrode assembly is connected to one of the two tabs of the other electrode assembly, and the connected two tabs are sealed along the seal
- the orthographic projection of the thickness direction Z has the tab overlap area
- the ratio of the overlapping width O1 of the two connected tabs to the width W1 of any tab is 40% ⁇ 100%
- the overlapping width O1 is the overlapping width of the two connected tabs viewed along the sealing thickness direction Z, at the outer edge of the sealing of the packaging case, along the sealing length direction X;
- the tab width W1 is the width of any one of the two connected tabs, viewed along the seal thickness direction Z, at the seal outer edge of the packaging case and along the seal length direction X.
- FIG. 1 shows an embodiment of the present application.
- a three-dimensional coordinate system is established with the seal length direction, the seal width direction and the seal thickness direction.
- the X direction represents the seal length direction
- the Y direction represents the seal width direction
- the Z direction represents the seal thickness direction.
- the electrochemical device comprises an electrode assembly and a packaging case 1, the electrode assemblies are arranged in respective independent cavities in the packaging case 1, for example, the first electrode assembly and the second electrode assembly are arranged in the packaging case 1 independently of each other
- each electrode assembly includes two tabs 2 with opposite polarities, wherein at least one tab 2 of one electrode assembly and the two tabs of the other electrode assembly are A connection, and the orthographic projection of the two tabs 2 of the connection along the seal thickness direction Z has a tab overlap area.
- the packaging shell 1 has a sealing area 5, and the dashed line in the sealing area 5 parallel to the X direction shows the outer edge of the sealing of the present application, and it can be known that the outer sealing edge is the upper boundary of the sealing area 5; each electrode assembly There are two tabs with opposite polarities, wherein one tab 2 is connected to one of the two tabs of the other electrode assembly, and the orthographic projection along the seal thickness direction Z has a tab overlap area 4 .
- the overlapping width of the two connected polar tabs is O1;
- the width of any one of the two connected tabs is W1; the ratio of O1 to W1 is 40% ⁇ 100%.
- each electrode assembly may include a positive electrode tab and a negative electrode tab, and adjacent electrode assemblies may be connected by the positive electrode tab and the negative electrode tab to realize the adjacent Series connection between electrode assemblies.
- the overlapping area of the tabs will affect the transmission of electrical energy between adjacent electrode assemblies. It is not limited to any theory. When the overlap width is small, the packaging reliability of the two connected tabs will be reduced, which in turn will affect the two adjacent electrode assemblies. packaging reliability.
- the ratio ⁇ of the width O1 of the overlapping region of the tabs of the two connected tabs to the width W1 of any tab is: 40% ⁇ 100%, preferably 50% ⁇ 100 %, which can not only ensure the effective power output and overcurrent capability of the high-voltage electrochemical device, but also ensure the packaging reliability between adjacent electrode assemblies.
- tab glue is provided on each of the two connected tabs, and at the sealing outer edge of the packaging case, along the sealing length direction X, the tab glue provided on the tabs is If the width exceeds the two sides of the tab, the ratio of the tab width D2 to the tab width W1 is D2/W1 ⁇ 1/60.
- the shoulder width D2 of the tab glue is the distance that one side of the tab glue exceeds the edge of the tab on the same side along the X direction at the outer edge of the seal of the packaging shell, and the tab glue on both sides Shoulder widths can be equal or unequal.
- the ratio of D2/W1 within the above range can ensure the packaging reliability of the electrochemical device.
- the width W1 of the tab is: 2mm ⁇ W1 ⁇ 60mm.
- the width W1 of the tabs directly affects the size of the overlapping area of the tabs, and when the width W1 of the tabs is within the above range, the connection reliability between adjacent electrode assemblies can be effectively improved.
- the orthographic projection of the tab glue on the two connected tabs along the seal thickness direction Z has a tab glue overlapping area, and the overlapping width O2 of the tab glue occupies either pole
- the ratio ⁇ of the ear gel width W2 is: 40% ⁇ 100%;
- the overlapping width O2 of the tab glue is observed along the sealing thickness direction Z, and at the outer edge of the sealing of the packaging shell, along the sealing length direction X, the overlapping width of the tab glue;
- the width W2 of the tab glue is the width of any one of the tab glues, viewed along the seal thickness direction Z, at the sealing outer edge of the packaging case, along the seal length direction X.
- FIG. 3 shows an embodiment of the present application
- the tab glue 3 on the two connected tabs has a tab glue overlapping area 6, along the sealing length direction X, at the sealing outer edge of the packaging shell 1,
- the ratio ⁇ of the width O2 of the tab glue overlapping region 6 to the width W2 of any tab glue at the sealing outer edge of the packaging shell 1 is: 40% ⁇ 100%.
- the tab glue overlapping area 6 will also affect the packaging reliability of the two connected tabs. When the width of the tab glue overlapping area 6 is small, the electrochemical device will be bent by external force, and it is easy to bend at the junction of the two connected tabs.
- the strain of the tabs to the plane of the vertical tabs is generated, and stress is generated at the junction, so that cracks are easily generated, and the packaging reliability of the two connected tabs is reduced.
- the ratio of the width of the tab glue overlapping region 6 to the width of any tab glue is within the above ratio range, which can further improve the packaging reliability between adjacent electrode assemblies.
- the distance between the two connected tabs is D5; the two connected tabs have a connection Area 7, the length D6 of the tab between the connection area 7 and the outer edge of the seal of the packaging shell 1; the relationship between D5 and D6 satisfies: 0 ⁇ D5/D6 ⁇ 1.7, preferably 3 ⁇ 10 -3 ⁇ D5/D6 ⁇ 1.5 .
- the distance D5 between the two connected tabs refers to the distance between the two connected tabs at the sealing outer edge of the packaging case
- H1 and H2 are respectively the distance between the two adjacent electrode assemblies. Thickness, H1 and H2 can be the same or different.
- the distance between the two tabs connected in this application refers to the distance between the two tabs along the sealing thickness direction Z at the outer edge of the seal of the tab and the packaging case.
- FIG. 3 shows an embodiment of the present application
- the two connected tabs have a connecting area 7
- D6 refers to the length of the tab between the lower edge of the connecting area 7 and the outer edge of the packaging shell 1 sealed.
- D6 refers to the length of the tab between the lower edge of the connecting area 7 and the outer edge of the packaging shell 1 sealed.
- the ratio of D5/D6 satisfies the above range, which can not only improve the connection reliability between two adjacent electrode assemblies, but also improve the packaging reliability of the electrochemical device.
- 3mm ⁇ D6 ⁇ 30mm 3mm ⁇ D6 ⁇ 30mm.
- D6 is small, it is easy to damage the tab glue on the tabs when connecting the two tabs, which affects the packaging reliability of the electrochemical device, and the connection operation is difficult; Under the action, cracks are prone to occur, which reduces the connection reliability of two adjacent electrode assemblies; again, the distance between the connection area and the packaging shell is close, because the electrode assembly has a certain thickness, it will affect the connection strength of the connection area, so that the adjacent two The connection reliability of the electrode assembly is reduced; and when the connection is not tight enough due to the low connection strength of the connection area, the resistance of the connection area will increase during the use of the electrode assembly, which will increase the temperature rise of the electrode tab during charging, resulting in the electrode tab.
- the glue softens or melts, reducing the packaging reliability of the electrochemical device.
- D6 is large, when the electrochemical device is subjected to external force, the connection area is more easily damaged, which reduces the reliability of the connection between two adjacent electrode assemblies, and when D6 is large, the connection area will increase The volume of the electrochemical device, because the connection area is an inactive material area, does not provide energy, which will lead to a decrease in the volumetric energy density of the electrochemical device. Therefore, when D6 is within the above range, the obtained electrochemical device has excellent packaging reliability and use reliability.
- the area S1 of the connection area is 1 mm 2 to 200 mm 2 .
- the area S1 of the connection area is less than or equal to the area of the overlapping area of the tabs, that is, the overlapping area of the tabs can be fully connected, or part of the overlapping area of the tabs can be connected, as long as the connection reliability of the two tabs can be guaranteed , to achieve the purpose of this application.
- the area of the connection area is too small, the connection reliability between the two connected tabs is reduced, and at the same time, the current carrying capacity of the connection area is reduced.
- the connection reliability between adjacent electrode assemblies and the normal operation of the electrochemical device can be effectively guaranteed.
- the increase of the area S1 of the connection area can also reduce the heat generation of the tabs and the consumption of electric energy, thereby preventing the tabs from being heated and causing softening or melting of the tab glue, and improving the packaging reliability of the electrochemical device.
- connection area when the area S1 of the connection area remains unchanged, the width of the overlapping area of the tabs decreases, the width of the connection area along the seal length direction X becomes smaller, the connection strength of the connection area decreases, and the connection reliability of the adjacent electrode components also follows. reduce.
- the distance of the tab glue 3 beyond the upper edge of the packaging shell along the sealing width direction Y is 0.2mm ⁇ D1 ⁇ 5mm, and the distance of the tab glue 3 is 0.2mm ⁇ D1 ⁇ 5mm.
- the shoulder width is 1mm ⁇ D2 ⁇ 8mm.
- the thickness of the tab glue 3 is 0.1mm ⁇ D3 ⁇ 3mm, and the thickness of the tab 2 is 0.2mm ⁇ D4 ⁇ 5mm.
- the tab glue provided on the tab can be combined with the packaging shell, and the combination can be the sealing connection between the tab and the packaging shell through the tab glue.
- the two tabs of each electrode assembly may protrude from the packaging shell from the same direction or different directions.
- the protruding direction of the two tabs can be on one side of the packaging shell, or one can protrude from any two sides of the packaging shell.
- the electrochemical device may further include a separator 8 between the electrode assemblies, the cavity is located on both sides of the separator 8, and each electrode assembly may are arranged in separate cavities.
- the thickness of the separator is 2 ⁇ m to 100 ⁇ m, preferably 5 ⁇ m to 50 ⁇ m, and more preferably 10 ⁇ m to 30 ⁇ m.
- the separator not only has the characteristics of ionic insulation, but also should have certain mechanical strength. Therefore, if the separator is too thin, the mechanical strength is poor, which is likely to cause damage and affect the performance and even the safety of the electrochemical device.
- the separator 8 in order to achieve effective bonding between the tab glue 3 and the separator 8 , the separator 8 further includes a bonding material 9 .
- the structure of the electrode assembly includes at least one of a wound structure and a laminated structure.
- the cavity is a sealed cavity.
- the sealed cavity is a sealed connection between the separator and the packaging shell, and independent cavities are formed on both sides of the separator, and the electrode assemblies and the electrolyte on both sides of the separator are completely separated, which not only ensures the normal operation of the electrode assemblies on both sides, Moreover, the good sealing performance is also beneficial to improve the safety and environmental stability of the electrochemical device.
- connection manner of the two tabs to be connected is not particularly limited, as long as the purpose of the present application can be achieved.
- solder connections for example.
- the manner of the above-mentioned welding connection is not particularly limited, as long as the purpose of the present application can be achieved.
- laser welding ultrasonic welding or resistance welding, etc.
- connection mode of the two tabs to be connected is welding connection
- the area of the connection area is the area surrounded by the outermost welding points, and the welding points are distributed in the connection area.
- the electrode assembly mentioned in this application may be an electrode assembly including a positive electrode piece, a negative electrode piece and a separator, and the above-mentioned electrode assembly is used as an example for description. It should be understood by those skilled in the art that the following descriptions are only examples and do not limit the protection scope of the present application.
- the thickness of the electrode assembly is not particularly limited as long as the purpose of the present application can be achieved.
- the thickness of the electrode assembly is 3 mm.
- the positive electrode sheet is not particularly limited, as long as the purpose of the present application can be achieved.
- the positive electrode sheet typically includes a positive electrode current collector and a positive electrode active material.
- the positive electrode current collector is not particularly limited, and can be any positive electrode current collector known in the art, such as copper foil, aluminum foil, aluminum alloy foil, composite current collector, and the like.
- the positive electrode active material is not particularly limited, and can be any positive electrode active material in the prior art.
- the positive electrode active material includes nickel-cobalt lithium manganate, nickel-cobalt lithium aluminate, lithium iron phosphate, lithium cobaltate, manganic acid At least one of lithium or lithium iron manganese phosphate.
- the thicknesses of the positive electrode current collector and the positive electrode active material are not particularly limited as long as the purpose of the present application can be achieved.
- the thickness of the cathode current collector is 8 ⁇ m to 12 ⁇ m
- the thickness of the cathode active material is 30 ⁇ m to 120 ⁇ m.
- the positive electrode sheet may further include a conductive layer, and the conductive layer is located between the positive electrode current collector and the positive electrode active material layer.
- the composition of the conductive layer is not particularly limited, and may be a conductive layer commonly used in the art.
- the conductive layer includes a conductive agent and an adhesive.
- the negative pole piece is not particularly limited, as long as the purpose of the present application can be achieved.
- the negative electrode sheet generally includes a negative electrode current collector and a negative electrode active material.
- the negative electrode current collector is not particularly limited, and any negative electrode current collector known in the art can be used, such as copper foil, aluminum foil, aluminum alloy foil, and composite current collector.
- the negative electrode active material is not particularly limited, and any negative electrode active material known in the art may be used.
- at least one of artificial graphite, natural graphite, mesocarbon microspheres, silicon, silicon carbon, silicon oxide, soft carbon, hard carbon, lithium titanate, or niobium titanate may be included.
- the thicknesses of the negative electrode current collector and the negative electrode active material are not particularly limited as long as the purpose of the present application can be achieved.
- the thickness of the anode current collector is 6 ⁇ m to 10 ⁇ m
- the thickness of the anode active material is 30 ⁇ m to 120 ⁇ m.
- the negative electrode sheet may further include a conductive layer, and the conductive layer is located between the negative electrode current collector and the negative electrode active material layer.
- the composition of the conductive layer is not particularly limited, and may be a conductive layer commonly used in the art.
- the conductive layer includes a conductive agent and an adhesive.
- the above-mentioned conductive agent is not particularly limited, and any conductive agent known in the art can be used as long as the purpose of the present application can be achieved.
- the conductive agent may include at least one of conductive carbon black (Super P), carbon nanotubes (CNTs), carbon fiber or graphene, and the like.
- the above-mentioned adhesive is not particularly limited, and any adhesive known in the art can be used as long as the purpose of the present application can be achieved.
- the adhesive may include at least one of styrene-butadiene rubber (SBR), polyvinyl alcohol (PVA), polytetrafluoroethylene (PTFE), sodium carboxymethyl cellulose (CMC-Na), and the like.
- the separator is not particularly limited, as long as the purpose of the present application can be achieved.
- the thickness of the separator may be 5 ⁇ m to 15 ⁇ m, and the separator may include polymers or inorganic substances formed of materials stable to the electrolyte of the present application.
- the diaphragm may also be referred to as a separator.
- the separator may include a substrate layer and a surface treatment layer.
- the substrate layer can be a non-woven fabric, film or composite film with a porous structure, and the material of the substrate layer can include at least one of polyethylene, polypropylene, polyethylene terephthalate and polyimide .
- polypropylene porous membranes, polyethylene porous membranes, polypropylene non-woven fabrics, polyethylene non-woven fabrics, or polypropylene-polyethylene-polypropylene porous composite membranes may be used.
- at least one surface of the substrate layer is provided with a surface treatment layer, and the surface treatment layer can be a polymer layer or an inorganic layer, or a layer formed by mixing a polymer and an inorganic substance.
- the inorganic layer includes inorganic particles and a binder
- the inorganic particles are not particularly limited, and can be selected from aluminum oxide, silicon oxide, magnesium oxide, titanium oxide, hafnium dioxide, tin oxide, ceria, nickel oxide, for example , at least one of zinc oxide, calcium oxide, zirconium oxide, yttrium oxide, silicon carbide, boehmite, aluminum hydroxide, magnesium hydroxide, calcium hydroxide and barium sulfate.
- the binder is not particularly limited, for example, it can be selected from polyvinylidene fluoride, vinylidene fluoride-hexafluoropropylene copolymer, polyamide, polyacrylonitrile, polyacrylate, polyacrylic acid, polyacrylate, polyethylene One or a combination of rolidone, polyvinyl ether, polymethyl methacrylate, polytetrafluoroethylene and polyhexafluoropropylene.
- the polymer layer contains a polymer, and the material of the polymer includes polyamide, polyacrylonitrile, acrylate polymer, polyacrylic acid, polyacrylate, polyvinylpyrrolidone, polyvinyl ether, polyvinylidene fluoride or poly( At least one of vinylidene fluoride-hexafluoropropylene).
- the tabs mentioned in this application refer to the metal conductors drawn from the positive pole piece or the negative pole piece, and are used for connecting other parts of the electrochemical device in series or in parallel.
- the positive tab is drawn from the positive pole piece, and the negative pole tab is drawn from the negative pole piece.
- the material of the tab glue in this application, and any tab glue known in the art can be used, as long as the purpose of the present application can be achieved.
- the material of the polar ear glue may include at least one of polypropylene (PP), polyethylene terephthalate (PET), polyethylene naphthalate (PEN), etc., and may also include Composite materials of the above polymers, for example, PP/PET/PP composite materials, PP/PEN/PP composite materials, PP/non-woven fabric/PP composite materials or PP/high temperature barrier layer/PP composite materials, etc.
- the width of the tab glue is not particularly limited, as long as the purpose of the present application can be achieved. For example, the width of the tab glue is 4mm to 76mm.
- the non-woven fabric is not particularly limited as long as it can achieve the purpose of the present application, such as polypropylene non-woven fabric, polyethylene non-woven fabric, and the like.
- the high temperature barrier layer is not particularly limited as long as it can achieve the purpose of the present application, such as an aramid layer and the like.
- the separator is not particularly limited in the present application, and any separator known in the art can be used as long as the purpose of the present application can be achieved.
- the separator needs to have ionic insulation to avoid high voltage decomposition of the electrolyte and short circuits within the electrode assembly.
- the material of the separator includes at least one of polymer materials, metal materials, carbon materials or composite materials thereof.
- the polymer material is not particularly limited, as long as the application can be achieved, any material known to those skilled in the art can be used, for example, the polymer material can include polyethylene terephthalate, polyethylene terephthalate Butylene formate, polyethylene naphthalate, polyether ether ketone, polyimide, polyamide, polyethylene glycol, polyamideimide, polycarbonate, cyclic polyolefin, polyphenylene Sulfide, polyvinyl acetate, polytetrafluoroethylene, polymethylene naphthalene, polyvinylidene fluoride, polyethylene naphthalate, polypropylene carbonate, poly(vinylidene fluoride-hexafluoropropylene) , poly(vinylidene fluoride-co-chlorotrifluoroethylene), silicone, vinylon, polypropylene, acid anhydride modified polypropylene, polyethylene, ethylene-vinyl acetate copolymer, ethylene-e
- the metal material is not particularly limited, and any material known to those skilled in the art can be used as long as the purpose of the present application can be achieved, for example, it can include Ni, Ti, Cu, Ag, Au, Pt, Fe, Co, Cr, At least one of W, Mo, Al, Mg, K, Na, Ca, Sr, Ba, Si, Ge, Sb, Pb, In, Zn, stainless steel, and combinations or alloys thereof.
- a metal material with better redox resistance in the lithium-ion battery environment can be selected.
- the carbon material includes at least one of carbon felt, carbon film, carbon black, acetylene black, fullerene, conductive graphite film or graphene film.
- the ion insulating layer is preferably made of a polymer material. Since the polymer material has a low density, the weight of the inactive material can be reduced, thereby increasing the mass energy density of the electrode assembly.
- the ionic insulating layer is made of polymer material, under mechanical abuse (pinning, impact, extrusion, etc.), the probability of generating debris is smaller, and the wrapping effect on mechanically damaged surfaces is better, so the above-mentioned mechanical abuse can be improved. The safety boundary of the situation is improved, and the pass rate of the safety test is improved.
- the separator further includes an encapsulation layer, the encapsulation layer may be disposed on both sides of the ion insulating layer, and the encapsulation layer is disposed at the surrounding edges of the surface of the ion insulating layer or the entire surface thereof Above, the encapsulation layer is used for sealingly connecting the ion insulating layer and the packaging shell.
- the material of the encapsulation layer is not particularly limited, as long as the purpose of the application can be achieved, and materials known to those skilled in the art can be used.
- the material of the encapsulation layer includes polypropylene, acid anhydride modified polymer Propylene, polyethylene, ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, ethylene-acrylic acid copolymer, ethylene-vinyl alcohol copolymer, polyvinyl chloride, polystyrene, polyether nitrile, polyurethane, polyamide, At least one of polyesters, amorphous ⁇ -olefin copolymers and derivatives thereof.
- the encapsulation layer of the present application also has the function of ion insulation when covering the entire surface of the ion insulation layer.
- the separator is divided into an ion insulating layer and an encapsulation layer, which does not mean that the encapsulation layer has no ion insulating properties.
- the ion insulating layer and the encapsulation layer together play an ion insulating function.
- the bonding material between the separator and the tab glue is not particularly limited, as long as the purpose of the present application can be achieved, materials known to those skilled in the art can be used, for example, the bonding materials include polypropylene, polyester , at least one of p-hydroxybenzaldehyde, polyamide, polyphenylene ether, polyurethane, etc.
- the electrolyte referred to in this application may contain a lithium salt and a non-aqueous solvent.
- the lithium salt is not particularly limited, and any lithium salt known in the art can be used as long as the purpose of the present application can be achieved.
- lithium salts may include LiPF 6 , LiBF 4 , LiAsF 6 , LiClO 4 , LiB(C 6 H 5 ) 4 , LiCH 3 SO 3 , LiCF 3 SO 3 , LiN(SO 2 CF 3 ) 2 , LiC(SO 2 ) At least one of CF 3 ) 3 or LiPO 2 F 2 .
- LiPF 6 can be selected as the lithium salt.
- the non-aqueous solvent is not particularly limited as long as the purpose of the present application can be achieved.
- the non-aqueous solvent may include at least one of carbonate compounds, carboxylate compounds, ether compounds, nitrile compounds, and other organic solvents.
- the carbonate compound may include diethyl carbonate (DEC), dimethyl carbonate (DMC), dipropyl carbonate (DPC), methyl propyl carbonate (MPC), ethyl propyl carbonate (EPC), ethyl methyl carbonate Ester (MEC), Ethylene Carbonate (EC), Propylene Carbonate (PC), Butylene Carbonate (BC), Vinyl Ethylene Carbonate (VEC), Fluoroethylene Carbonate (FEC), Carbonic Acid 1 ,2-difluoroethylene carbonate, 1,1-difluoroethylene carbonate, 1,1,2-trifluoroethylene carbonate, 1,1,2,2-tetrafluoroethylene carbonate, 1,1,2,2-tetrafluoroethylene carbonate -Fluoro-2-methylethylene carbonate, 1-fluoro-1-methylethylene carbonate, 1,2-difluoro-1-methylethylene carbonate, 1,1,2-trifluorocarbonate- At least one of 2-methylethylene and trifluoromethylethylene carbonate.
- the packaging shell includes at least one of an aluminum-plastic film, an aluminum shell, a steel shell, and a plastic shell.
- the packaging shell can include an inner layer and an outer layer, and the inner layer is sealed with the partition, so the material of the inner layer can include polymer materials, so as to achieve a good sealing effect; at the same time, the combination of the inner layer and the outer layer can effectively protect the Internal structure of electrochemical devices.
- the material of the inner layer is not particularly limited, as long as the purpose of the application can be achieved, for example, the material of the inner layer includes polypropylene, polyester, p-hydroxybenzaldehyde, polyamide, polyphenylene ether, polyurethane at least one of etc.
- the material of the outer layer is not particularly limited, as long as the purpose of the present application can be achieved.
- the material of the outer layer includes at least one of aluminum foil, aluminum oxide layer, silicon nitride layer, and the like.
- the thickness of the packaging shell in the present application is 60 ⁇ m to 500 ⁇ m, preferably 60 ⁇ m to 300 ⁇ m, and more preferably 60 ⁇ m to 200 ⁇ m, which can effectively protect the internal structure of the electrochemical device.
- the sealing thickness T (unit: mm) and the sealing width W (unit: mm) of the separator and the sealing area of the packaging shell satisfy 0.01 ⁇ T/W ⁇ 0.05.
- the seal thickness and the seal width are not particularly limited, as long as the purpose of the present application can be achieved, for example, the seal width is preferably 1 mm to 7 mm.
- the sealing connection method between the separator and the packaging shell in the present application includes one of hot pressing, glue sealing, and welding.
- the hot pressing conditions are not particularly limited, as long as the purpose of the present application can be achieved.
- the hot pressing temperature is 150°C to 220°C
- the hot pressing pressure is 0.1 Mpa to 0.6 MPa.
- the structure of the electrode assembly is a winding structure, and the electrode assembly includes a monopole tab or a multipole tab.
- the electrode assembly includes a monopole lug, and a positive electrode lug and a negative electrode lug are drawn from the positive pole piece and the negative pole piece respectively.
- the electrode assembly includes multi-pole lugs, which can be drawn from each circle of positive pole pieces and negative pole pieces, respectively leading out one positive pole piece and one negative pole piece, or from two or more circles of positive pole pieces and negative pole pieces.
- a positive electrode tab and a negative electrode tab are drawn out respectively, and finally an electrode assembly with a winding structure includes multiple groups of positive electrode tabs and negative electrode tabs, and then the lead wires of the tabs are transferred by welding.
- the structure of the electrode assembly is a laminated structure, and the electrode assembly includes multi-pole tabs, which may be one positive tab and one negative pole drawn from each layer of positive pole piece and negative pole piece, respectively.
- a laminated structure electrode assembly includes multiple sets of positive electrode tabs and negative electrode tabs, which are then transferred to the lead tabs through transfer welding.
- the present application also provides an electronic device comprising the electrochemical device provided by the present application.
- the electronic device of the present application is not particularly limited, and it can be any electronic device known in the prior art.
- display devices include, but are not limited to, notebook computers, pen-type computers, mobile computers, e-book players, portable telephones, portable fax machines, portable copiers, portable printers, stereo headphones, video recorders, LCD televisions, portable Cleaners, portable CD players, mini discs, transceivers, electronic notepads, calculators, memory cards, portable recorders, radios, backup power supplies, motors, cars, motorcycles, power-assisted bicycles, bicycles, lighting equipment, toys, game consoles , clocks, power tools, flashlights, cameras, large household batteries and lithium-ion capacitors, etc.
- the method for preparing the electrochemical device of the present application is not particularly limited, and any method known in the art can be used.
- the present application can be prepared by the following preparation method:
- the positive electrode active material and the solvent are prepared into a slurry, and stirred evenly.
- the slurry is uniformly coated on the positive electrode sheet and dried to obtain a single-sided coated positive electrode sheet.
- the positive pole piece is cut for use.
- the coating thickness of the cathode active material on one surface was 65 ⁇ m.
- each electrode assembly includes a positive electrode tab and a negative electrode tab; repeat the above steps to obtain A plurality of electrode assemblies; the structure of the electrode assembly can be a wound structure or a laminated structure.
- Electrode assembly assembly place the packaging case in the assembly jig, then space the electrode assembly and the separator, and the packaging case is adjacent to the electrode assembly, and finally seal to obtain the assembled electrode assembly.
- Liquid injection packaging separately inject electrolyte into the two cavities of the assembled electrode assembly, and pull all the tabs of the electrode assembly out of the aluminum plastic film for subsequent processing.
- the electrochemical device provided in this application may include two electrode assemblies, or may include three or more electrode assemblies.
- preparation method of an electrochemical device containing two electrode assemblies or three or more electrode assemblies reference can be made to the above-mentioned preparation method of an electrochemical device. Electrochemical devices comprising three or more electrode assemblies are also within the scope of protection as defined in the claims of the present application.
- sample 1 Cut sample 1 into a test strip with a width L of 8 mm, to ensure that the test strip completely preserves the entire sealing area, and the packaging shells on both sides of the sealing area are also intact, obtaining sample 2;
- the test temperature was 25 ⁇ 3°C
- the lithium-ion battery was charged to 4.2V with a constant current of 0.5C, then charged to a current of 0.05C with a constant voltage of 4.2V, left for 10min, and then discharged with a current of 0.5C
- the test temperature was 25 ⁇ 3°C
- Electrode assembly A and electrode assembly B The separator, the double-sided coated negative pole piece, the separator, and the double-sided coated positive pole piece are sequentially stacked to form a stack, and then the four corners of the entire stack structure are stacked. Secured for backup.
- Each electrode assembly includes a positive electrode tab and a negative electrode tab.
- the positive electrode tab is aluminum (Al) and the negative electrode tab is nickel (Ni).
- the two tabs are arranged side by side.
- the thickness D4 of the tab is 0.3mm.
- the width W1 of the ear is 5mm; the diaphragm is a polyethylene (PE) film with a thickness of 15 ⁇ m.
- PE polyethylene
- PP packaging layer material polypropylene
- NMP dispersant N-methylpyrrolidone
- the PP suspension was coated on both sides of the polyimide (PI) film with a thickness of 15 ⁇ m, respectively; and then dried at 130° C. to remove the dispersant NMP in the suspension, and the preparation of the separator was completed.
- the thickness of the separator is 15 ⁇ m.
- Assembly of electrode assembly B place the assembled semi-finished product in the assembly jig, with the separator facing up, and place the electrode assembly B on the separator with the separator facing down, so that the edges are aligned, apply external force to press, and then Cover the electrode assembly B with another punched aluminum-plastic film pit face down, and set a tab glue with a width of 11mm in the area corresponding to the tab of the electrode assembly B at the edge of the aluminum-plastic film.
- the surrounding area is heat-sealed in a manner to obtain an assembled electrode assembly.
- the distance D1 between the upper edge of the tab glue and the upper edge of the packaging shell is 1 mm
- the shoulder width D2 of the tab glue is 3 mm
- the thickness D3 of the tab glue is 0.2 mm.
- Liquid injection packaging inject electrolyte into each cavity of the assembled electrode assembly separately, and lead all the tabs of electrode assemblies A and B out of the aluminum plastic film.
- the width of the overlapping area of the negative tab of electrode assembly A and the positive tab of electrode assembly B is 4.75 mm
- the width of the overlapping area of the tab glue of the negative tab of electrode assembly A and the positive tab of electrode assembly B is 10.67mm.
- connection area 20 mm 2
- the distance D5 between the two connected tabs is 3 mm
- the distance D6 between the connection area and the aluminum-plastic film is 5 mm.
- the width of the overlapping area of the negative tab of electrode assembly A and the positive tab of electrode assembly B is 2.5 mm, and the width of the overlapping area of the tab glue of the negative tab of electrode assembly A and the positive tab of electrode assembly B is 5.61 mm , and the rest are the same as in Example 1.
- the width of the tab glue is 8 mm, the shoulder width D2 of the tab glue is 1.5 mm, and the rest are the same as those in Example 1.
- the width of the overlapping area of the negative tab of electrode assembly A and the positive tab of electrode assembly B is 3 mm, and the width of the overlapping area of the tab glue of the negative tab of electrode assembly A and the positive tab of electrode assembly B is 6.6 mm, The rest are the same as in Example 1.
- the rest is the same as that of Example 3.
- the current carrying capacity per unit area of the connection area is 5A/mm 2 .
- Electrode assembly C is prepared according to step (4) of Example 1; when the electrode assembly is encapsulated, place the diaphragm of electrode assembly B on the separator so that the edges are aligned, and then set a separator on electrode assembly B after applying external force Then place the electrode assembly C with the diaphragm facing down and place it on the separator so that the edges are aligned, and apply external force to press; A tab glue with a width of 11 mm was set in the area corresponding to the tab of the electrode assembly C at the edge of the aluminum plastic film, and the surrounding area was heat-sealed by hot pressing to obtain an assembled electrode assembly.
- Example 15 The rest is the same as in Example 15, except that the positive electrode tabs and the negative electrode tabs of the electrode assemblies A and B respectively protrude from the packaging case in opposite directions.
- Electrode assembly A and electrode assembly B stack the separator, the double-sided coated negative pole piece, the separator, and the double-sided coated positive pole piece, and then start winding from one end to form a wound electrode assembly.
- Each electrode assembly includes a positive electrode tab and a negative electrode tab, the two tabs are arranged side by side, the thickness D4 of the tab is 0.3mm, and the width W1 of the tab is 5mm; the diaphragm is made of polyethylene (PE) film with a thickness of 15 ⁇ m .
- PE polyethylene
- PP packaging layer material polypropylene
- NMP dispersant N-methylpyrrolidone
- the PP suspension was coated on both sides of the polyimide (PI) film with a thickness of 15 ⁇ m, respectively; and then dried at 130° C. to remove the dispersant NMP in the suspension, and the preparation of the separator was completed.
- the thickness of the separator is 15 ⁇ m.
- Assembly of the electrode assembly B place the assembled semi-finished product in the assembly jig with the separator facing up, place the electrode assembly B on the separator so that the edges are aligned, apply external force to press, and then punch another
- the aluminum-plastic film is covered on the electrode assembly B with the pit face down, and a tab glue with a width of 11 mm is set at the edge of the aluminum-plastic film in the area corresponding to the tab of the electrode assembly B, and the surrounding area is heat-sealed by hot pressing to obtain Assemble the electrode assembly.
- the distance D1 between the upper edge of the tab glue and the upper edge of the packaging case is 5 mm
- the shoulder width D2 of the tab glue is 3 mm
- the thickness D3 of the tab glue is 0.2 mm.
- Liquid injection packaging inject electrolyte into each cavity of the assembled electrode assembly separately, and lead all the tabs of electrode assemblies A and B out of the aluminum plastic film.
- the width of the overlapping area of the negative tab of electrode assembly A and the positive tab of electrode assembly B is 4.75 mm
- the width of the overlapping area of the tab glue of the negative tab of electrode assembly A and the positive tab of electrode assembly B is 10.67mm.
- the shoulder width D2 of the tab glue is 3mm
- the thickness D3 of the tab glue is 0.2mm
- the distance D1 between the upper edge of the tab glue and the upper edge of the packaging shell is 1mm
- the distance between the two connected tabs is 3mm
- the The thickness D4 of the ear is 0.3 mm, and the rest is the same as that of Example 1.
- the width of the overlapping area of the negative tab of electrode assembly A and the positive tab of electrode assembly B is 1 mm, and the width of the overlapping area of the tab glue of the negative tab of electrode assembly A and the positive tab of electrode assembly B is 2.31 mm, The rest are the same as in Example 1.
- the ratio of the overlapping width of the two connected tabs to the width of any tab ⁇ and the ratio of the width of the overlapping area of the tab glue to the width of any tab glue ⁇ usually affect the packaging strength and bending stability of the electrochemical device;
- the area S1 of the connection area usually affects the connection strength of the connection area and the temperature rise of the tabs;
- the design and regulation of the relative positions of the two connected tabs usually affect the reliability of the connection between adjacent electrode assemblies and the packaging of electrochemical devices. It is realized by adjusting the distance between D1-D6.
- the obtained electrochemical device not only achieves an increase in the output voltage, but also improves the connection reliability and packaging reliability, and has very good industrial practicality. sex.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Sealing Battery Cases Or Jackets (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Electric Double-Layer Capacitors Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
Description
Claims (15)
- 一种电化学装置,其包含至少两个电极组件和包装壳,所述电极组件分别设置于包装壳内各自独立的腔体中;每个电极组件包含极性相反的两个极耳,其中一个电极组件的至少一个极耳与另一电极组件的所述两个极耳之一连接,并且所述连接的两个极耳沿封印厚度方向Z的正投影具有极耳重叠区域;所述连接的两个极耳的重叠宽度O1占任一极耳宽度W1的比例为40%<α≤100%;其中,所述重叠宽度O1为沿封印厚度方向Z观察,在所述包装壳封印外边缘处,沿封印长度方向X,所述连接的两个极耳的重叠宽度;所述极耳宽度W1为沿封印厚度方向Z观察,在所述包装壳封印外边缘处,沿封印长度方向X,所述连接的两个极耳中任一极耳的宽度。
- 根据权利要求1所述的电化学装置,其中,所述连接的两个极耳上各自设置有极耳胶,在所述包装壳封印外边缘处,沿封印长度方向X,所述极耳上设置的极耳胶宽度超出该极耳的两侧,所述极耳胶肩宽D2与所述极耳宽度W1的比值为D2/W1≥1/60;其中,所述极耳胶肩宽D2为在所述包装壳封印外边缘处,极耳胶的一侧沿X方向超出同一侧极耳边缘的距离。
- 根据权利要求2所述的电化学装置,其中,所述连接的两个极耳上的极耳胶沿封印厚度方向Z的正投影具有极耳胶重叠区域,所述极耳胶的重叠宽度O2占任一极耳胶宽度W2的比例为40%<β≤100%;其中,所述极耳胶的重叠宽度O2为沿封印厚度方向Z观察,在所述包装壳封印外边缘处,沿封印长度方向X,所述极耳胶的重叠宽度;所述极耳胶宽度W2为沿封印厚度方向Z观察,在所述包装壳封印外边缘处,沿封印长度方向X,所述极耳胶中任一极耳胶的宽度。
- 根据权利要求1所述的电化学装置,其中,在包装壳封印外边缘处,所述连接的两个极耳之间的距离为D5;所述连接的两个极耳具有连接区域,所述连接区域与所述包装壳封印外边缘处之间的极耳长度为D6;D5与D6的关系满足:0<D5/D6≤1.7。
- 根据权利要求4所述的电化学装置,其中,3mm≤D6≤30mm。
- 根据权利要求4所述的电化学装置,其中,0.1mm<D5≤(H1+H2)/2+5mm,其中,H1和H2分别为所述两个连接电极组件的厚度。
- 根据权利要求4所述的电化学装置,其中,所述连接区域的面积S1为1mm 2至200mm 2。
- 根据权利要求1所述的电化学装置,其中,沿远离电极组件方向,所述极耳胶沿封印宽度方向Y超出所述包装壳上边缘的距离为0.2mm≤D1≤5mm,所述极耳胶的厚度为0.1mm≤D3≤3mm,所述极耳厚度为0.2mm≤D4≤5mm。
- 根据权利要求1所述的电化学装置,其中,50%≤α≤100%。
- 根据权利要求1所述的电化学装置,其中,所述连接的两个极耳为极性相反的两个极耳。
- 根据权利要求1所述的电化学装置,其中,所述电极组件具有从不同方向伸出包装壳的极耳。
- 根据权利要求1所述的电化学装置,还包含位于所述电极组件之间的隔板,其中,所述隔板的厚度为2μm至100μm。
- 根据权利要求1所述的电化学装置,其中,所述电极组件的结构包括卷绕结构、叠片结构中的至少一种。
- 根据权利要求1所述的电化学装置,其中,所述包装壳包括铝塑膜、铝壳、钢壳、塑料壳中的至少一种。
- 一种电子装置,包含权利要求1至14中任意一项所述电化学装置。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
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JP2023515329A JP2023541025A (ja) | 2020-09-08 | 2020-09-08 | 電気化学装置及び電子装置 |
PCT/CN2020/114083 WO2022051914A1 (zh) | 2020-09-08 | 2020-09-08 | 一种电化学装置及电子装置 |
KR1020237008933A KR20230044022A (ko) | 2020-09-08 | 2020-09-08 | 전기화학 디바이스 및 전자 디바이스 |
EP20952702.7A EP4213279A4 (en) | 2020-09-08 | 2020-09-08 | ELECTROCHEMICAL DEVICE AND ELECTRONIC DEVICE |
US18/179,575 US20230246272A1 (en) | 2020-09-08 | 2023-03-07 | Electrochemical apparatus and electronic apparatus |
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PCT/CN2020/114083 WO2022051914A1 (zh) | 2020-09-08 | 2020-09-08 | 一种电化学装置及电子装置 |
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US18/179,575 Continuation US20230246272A1 (en) | 2020-09-08 | 2023-03-07 | Electrochemical apparatus and electronic apparatus |
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EP (1) | EP4213279A4 (zh) |
JP (1) | JP2023541025A (zh) |
KR (1) | KR20230044022A (zh) |
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CN116093552A (zh) * | 2023-04-10 | 2023-05-09 | 宁德新能源科技有限公司 | 一种电芯及电池 |
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CN116093552A (zh) * | 2023-04-10 | 2023-05-09 | 宁德新能源科技有限公司 | 一种电芯及电池 |
CN116093552B (zh) * | 2023-04-10 | 2023-08-18 | 宁德新能源科技有限公司 | 一种电芯及电池 |
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JP2023541025A (ja) | 2023-09-27 |
KR20230044022A (ko) | 2023-03-31 |
EP4213279A1 (en) | 2023-07-19 |
EP4213279A4 (en) | 2023-11-29 |
US20230246272A1 (en) | 2023-08-03 |
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