WO2016067510A1 - 電池 - Google Patents
電池 Download PDFInfo
- Publication number
- WO2016067510A1 WO2016067510A1 PCT/JP2015/004754 JP2015004754W WO2016067510A1 WO 2016067510 A1 WO2016067510 A1 WO 2016067510A1 JP 2015004754 W JP2015004754 W JP 2015004754W WO 2016067510 A1 WO2016067510 A1 WO 2016067510A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- insulating plate
- hole
- battery
- gas discharge
- bottom insulating
- Prior art date
Links
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- 229910052782 aluminium Inorganic materials 0.000 description 3
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- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 1
- 229910002991 LiNi0.5Co0.2Mn0.3O2 Inorganic materials 0.000 description 1
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- 239000006230 acetylene black Substances 0.000 description 1
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- BXKDSDJJOVIHMX-UHFFFAOYSA-N edrophonium chloride Chemical compound [Cl-].CC[N+](C)(C)C1=CC=CC(O)=C1 BXKDSDJJOVIHMX-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
-
- 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
- H01M50/30—Arrangements for facilitating escape of gases
- H01M50/342—Non-re-sealable arrangements
- H01M50/3425—Non-re-sealable arrangements in the form of rupturable membranes or weakened parts, e.g. pierced with the aid of a sharp member
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/147—Lids or covers
- H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
- H01M50/171—Lids or covers characterised by the methods of assembling casings with lids using adhesives or sealing agents
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/147—Lids or covers
- H01M50/148—Lids or covers characterised by their shape
- H01M50/152—Lids or covers characterised by their shape for cells having curved cross-section, e.g. round or elliptic
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/147—Lids or covers
- H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
- H01M50/169—Lids or covers characterised by the methods of assembling casings with lids by welding, brazing or soldering
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/572—Means for preventing undesired use or discharge
- H01M50/574—Devices or arrangements for the interruption of current
- H01M50/578—Devices or arrangements for the interruption of current in response to pressure
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2200/00—Safety devices for primary or secondary batteries
- H01M2200/20—Pressure-sensitive devices
-
- 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 present disclosure relates to a battery including a gas discharge port (exhaust valve) that opens when the internal pressure reaches a predetermined pressure.
- Patent Document 1 In order to prevent the battery case from rupturing or the like when the internal pressure of the battery rises due to heat generated by an internal short circuit or the like, a battery having a gas discharge port at the bottom or sealing body of the battery case is known (for example, Patent Document 1). reference).
- Patent Document 1 in order to stably discharge gas during thermal runaway, a protrusion is provided on the surface on the electrode body side of the insulating plate disposed between the electrode body and the gas discharge port, and a specific annular shape is provided. It is disclosed that an ether compound is added to the non-aqueous electrolyte.
- the gas discharge port provided at the bottom of the battery case has a short and simple gas discharge path compared to the gas discharge mechanism of the sealing body, and thus can efficiently discharge the gas.
- the electrode body moves due to gas release and clogs the discharge port, and smooth exhaustion may be hindered.
- a battery according to one aspect of the present disclosure includes a bottomed cylindrical case body in which an electrode body is accommodated, and a bottom insulating plate disposed between the electrode body and the bottom of the case body, and the bottom of the case body Is provided with a gas discharge port that opens when the battery internal pressure reaches a predetermined pressure, and the bottom insulating plate has a through hole, which is the ratio of the area of the through hole to the total area of the insulating plate.
- the opening ratio is 10% or more and 40% or less, and the Young's modulus at 25 ° C. is 10 GPa or more.
- the battery according to one aspect of the present disclosure suppresses clogging of the electrode body at the gas discharge port when the gas generated inside the battery is released to the outside, and enables smooth exhaust.
- FIG. 1 is a cross-sectional view of a battery 10 which is an example of an embodiment.
- the battery 10 includes a bottomed cylindrical case body 11 in which the electrode body 13 is accommodated, and a sealing body 12 that closes the opening of the case body 11.
- the case body 11 and the sealing body 12 constitute a battery case that seals the inside of the battery.
- the bottom 11a of the case body 11 is provided with a gas exhaust port 21 that opens when the battery internal pressure reaches a predetermined pressure.
- the sealing body 12 is also provided with a gas discharge mechanism.
- the electrode body 13 has a winding type structure in which, for example, a positive electrode 14 and a negative electrode 15 are wound via a separator 16.
- the electrode body 13 includes a positive electrode lead 17 attached to the positive electrode 14 and a negative electrode lead 18 attached to the negative electrode 15.
- the battery 10 includes a bottom insulating plate 19 disposed between the electrode body 13 and the bottom portion 11 a of the case body 11, and an upper insulating plate 20 disposed between the electrode body 13 and the sealing body 12. That is, the electrode body 13 is sandwiched from above and below by two insulating plates. In the example shown in FIG.
- the positive electrode lead 17 extends to the sealing body 12 side through the through hole 20 a of the upper insulating plate 20, and the negative electrode lead 18 passes to the bottom portion 11 a side of the case body 11 through the outside of the bottom insulating plate 19. It extends.
- the positive electrode 14 includes a positive electrode current collector such as a metal foil, and a positive electrode active material layer formed on the positive electrode current collector.
- a positive electrode current collector such as a metal foil that is stable in the potential range of the positive electrode 14 such as aluminum, a film in which the metal is disposed on the surface layer, or the like can be used.
- the positive electrode current collector has, for example, a long sheet shape, and a positive electrode active material layer is formed on both surfaces thereof.
- the positive electrode active material layer preferably includes a conductive material and a binder in addition to the positive electrode active material.
- the positive electrode active material is, for example, a lithium-containing composite oxide.
- the negative electrode 15 includes a negative electrode current collector such as a metal foil, and a negative electrode active material layer formed on the negative electrode current collector.
- a metal foil that is stable in the potential range of the negative electrode 15 such as copper or SUS, a film in which the metal is disposed on the surface layer, or the like can be used.
- the negative electrode current collector has, for example, a long sheet shape, and a negative electrode active material layer is formed on both surfaces thereof.
- the negative electrode active material layer preferably contains a binder in addition to the negative electrode active material. Further, a conductive material may be included as necessary.
- the negative electrode active material is, for example, graphite.
- the separator 16 is a porous sheet having ion permeability and insulating properties. Specific examples of the porous sheet include a microporous thin film, a woven fabric, and a nonwoven fabric. As a material of the separator 16, an olefin resin such as polyethylene and polypropylene, cellulose and the like are suitable.
- the separator may be a laminate having a cellulose fiber layer and a thermoplastic resin fiber layer such as an olefin resin.
- the electrolyte is a non-aqueous electrolyte containing, for example, a non-aqueous solvent and an electrolyte salt such as a lithium salt dissolved in the non-aqueous solvent.
- the nonaqueous electrolyte is not limited to a liquid electrolyte, and may be a solid electrolyte using a gel polymer or the like.
- the non-aqueous solvent for example, esters, ethers, nitriles such as acetonitrile, amides such as dimethylformamide, and a mixed solvent of two or more of these can be used.
- the non-aqueous solvent may contain a halogen-substituted product obtained by substituting hydrogen of these solvents with a halogen atom such as fluorine.
- the case body 11 is, for example, a bottomed cylindrical metal container that houses the electrode body 13 and an electrolyte.
- the negative electrode lead 18 is connected to the inner surface of the bottom 11a of the case main body 11 by welding or the like, and the case main body 11 serves as a negative electrode terminal.
- the positive electrode lead 17 is connected to the lower surface of the filter 23 of the sealing body 12 by welding or the like, and the cap 27 of the sealing body 12 electrically connected to the filter 23 serves as a positive electrode terminal.
- a gasket 28 is disposed between the case body 11 and the sealing body 12.
- the case body 11 preferably has a support portion 29 on which the sealing body 12 is placed.
- the support part 29 is formed in the upper part of the case main body 11, has a shape in which a part of the inner surface of the case main body 11 protrudes inward, and supports the sealing body 12 on the upper surface of the protruding part.
- the support portion 29 is preferably formed in an annular shape along the circumferential direction of the case main body 11, and is formed, for example, by pressing the side surface portion of the case main body 11 from the outside.
- the sealing body 12 is preferably configured by overlapping a plurality of members.
- the sealing body 12 is configured by overlapping the filter 23, the lower valve body 24, the insulating plate 25, the upper valve body 26, and the cap 27 in order from the bottom.
- Each member constituting the sealing body 12 has, for example, a disk shape or a ring shape.
- the lower valve body 24 and the upper valve body 26 are formed with thin portions (not shown) that are broken when the internal pressure of the battery rises.
- the cap 27 is a member provided on the uppermost part (outermost part) of the sealing body 12 and functions as a positive electrode terminal. A cap opening 27 a is formed in the cap 27.
- Each member (excluding the insulating plate 25) constituting the sealing body 12 is electrically connected to each other.
- the filter 23 and the lower valve body 24 are joined to each other at the peripheral portion, and the upper valve body 26 and the cap 27 are also joined to each other at the peripheral portion.
- the lower valve body 24 and the upper valve body 26 are in contact with each other at the center thereof, and an insulating plate 25 is interposed between the peripheral edges.
- the vicinity of the center portion of the lower valve body 24 bulges toward the upper valve body 26 and contacts the lower surface of the upper valve body 26.
- the contact portions of the valve bodies are preferably joined by welding or the like.
- the lower valve body 24, the upper valve body 26, and the cap 27 constitute a gas discharge mechanism for the sealing body 12.
- the lower valve body 24 is broken at the thin wall portion, whereby the upper valve body 26 swells toward the cap 27 and is separated from the lower valve body 24, thereby disconnecting the electrical connection between them.
- the upper valve body 26 is broken at the thin wall portion, and the gas generated inside the battery is discharged to the outside through the cap opening portion 27a.
- the opening area of the cap opening portion 27a is, for example, 10 mm 2 to 25 mm 2 (when the battery 10 is a 18650 type).
- FIG. 2 is a bottom view of the battery 10
- FIG. 3 is a plan view showing the bottom insulating plate 19 extracted.
- 4 and 5 are diagrams showing bottom insulating plates 19x and 19y, which are modifications of the bottom insulating plate 19.
- FIG. 1 is a diagram showing bottom insulating plates 19x and 19y, which are modifications of the bottom insulating plate 19.
- the bottom 11 a of the case body 11 is provided with a gas discharge port 21 that opens when the internal pressure of the battery 10 reaches a predetermined pressure.
- gas is released by the gas discharge mechanism of the sealing body 12 and gas is also released from the gas discharge port 21.
- the gas discharge port 21 is preferably designed to open at the same time as the gas discharge mechanism of the sealing body 12 is started or earlier than the gas discharge mechanism.
- an annular groove 22 is formed in the bottom 11 a of the case body 11, and a portion surrounded by the groove 22 serves as a gas discharge port 21.
- the groove 22 may have a C-shape or the like when viewed from the bottom, but is preferably formed in a perfect circle shape when viewed from the bottom from the viewpoint of improving breakability when the internal pressure is increased.
- the groove 22 is a stamp formed from, for example, the outer surface side of the bottom 11a.
- a plurality of gas discharge ports 21 may be provided, but preferably one is provided in the middle of the outer surface of the bottom portion 11a.
- the area of the gas discharge port 21 (opening area when the gas discharge port 21 is opened) is preferably 20% to 60%, more preferably 25% to 50% with respect to the area of the bottom portion 11a.
- the opening area of the gas discharge port 21 is, for example, 50 mm 2 to 80 mm 2 (when the battery 10 is a 18650 type), and is preferably larger than the opening area of the gas discharge mechanism of the sealing body 12.
- the opening area of the gas discharge port 21 is preferably at least twice as large as the opening area of the gas discharge mechanism. That is, the battery 10 has a structure in which gas is preferentially released from the bottom 11 a of the case body 11.
- the opening area of the cap opening 27a of the cap 27 is the opening area of the gas discharge mechanism.
- the bottom insulating plate 19 is disposed between the electrode body 13 and the bottom 11a of the case body 11 (see FIG. 1), and prevents conduction between the positive electrode 14 of the electrode body 13 and the case body 11. Further, the bottom insulating plate 19 plays a role of suppressing the movement of the electrode body 13 without inhibiting the exhaust when the gas generated inside the battery is discharged to the outside from the gas discharge port 21.
- the bottom insulating plate 19 since the case body 11 has a bottomed cylindrical shape, the bottom insulating plate 19 has a disk shape. The diameter of the bottom insulating plate 19 is slightly smaller than the diameter of the inner surface of the bottom 11a, for example.
- the bottom insulating plate 19 is formed in plural around the first through hole 19 a formed in a range including the center ⁇ of the bottom insulating plate 19 and the first through hole 19 a. And a second through hole 19b. Although there may be one through hole (for example, only the first through hole 19a), a plurality of through holes are preferably provided.
- the bottom insulating plate 19 has an opening ratio of 10% to 40% and a Young's modulus at 25 ° C. of 10 GPa or more.
- the aperture ratio is the ratio of the area of the through hole to the total area of the bottom insulating plate 19 (including the area where the through hole is formed).
- the Young's modulus is measured by a compression method (for example, manufactured by Orientec, Tensilon Universal Material Testing Machine) under a temperature condition of 25 ° C. Unless otherwise specified, Young's modulus means a value at 25 ° C.
- the sample for measuring the Young's modulus may be manufactured by cutting the bottom insulating plate 19 into a predetermined size, or may be separately manufactured using the same material as the constituent material of the bottom insulating plate 19.
- the thickness of the bottom insulating plate 19 is preferably from 0.1 mm to 1 mm, particularly preferably from 0.1 mm to 0.5 mm.
- a suitable example of the thickness of the bottom insulating plate 19 is 0.2 mm.
- the thickness of the upper insulating plate 20 is, for example, approximately the same as the thickness of the bottom insulating plate 19.
- the opening ratio of the bottom insulating plate 19 is 10% or more and 40% or less in total of the first through hole 19a and the second through hole 19b.
- the aperture ratio is preferably 15% or more and 35% or less, and more preferably 20% or more and 30% or less. If the aperture ratio of the bottom insulating plate 19 is within the range, it is possible to ensure the strength capable of suppressing the movement of the electrode body 13 without inhibiting the exhaust when the gas is discharged from the gas discharge port 21. Further, as the Young's modulus of the bottom insulating plate 19 is higher, the bottom insulating plate 19 is less likely to be broken or excessively deformed when the gas is released, and the jumping out of the electrode body 13 is easily suppressed.
- the lower limit value of Young's modulus is preferably 20 GPa or more, more preferably 30 GPa or more. For example, the upper limit value is 200 GPa.
- the bottom insulating plate 19 is not particularly limited as long as it has the above Young's modulus, but is preferably composed of a resin, for example, a resin having high heat resistance (for example, epoxy resin, polyimide resin, phenol resin, etc.), and particularly preferably. It is comprised from resin containing reinforcement materials, such as glass fiber.
- the reinforcing material may be silica, clay, mica or the like, but preferably boron fiber, aramid fiber, glass fiber or the like.
- a suitable example of the constituent material of the bottom insulating plate 19 is a glass fiber reinforced phenol resin (glass phenol resin) having a Young's modulus of 70 GPa.
- the glass fiber reinforced phenol resin may be used for the upper insulating plate 20, it is preferable to use a polyolefin resin such as polypropylene (Young's modulus 1.5 GPa) from the viewpoint of reducing material costs. That is, the Young's modulus of the bottom insulating plate 19 is higher than the Young's modulus of the upper insulating plate 20.
- a polyolefin resin such as polypropylene (Young's modulus 1.5 GPa) from the viewpoint of reducing material costs. That is, the Young's modulus of the bottom insulating plate 19 is higher than the Young's modulus of the upper insulating plate 20.
- the shape of the first through hole 19a and the second through hole 19b is a long hole or the like in which the shape of each second through hole 19bx extends long along the circumferential direction of the virtual circle ⁇ as illustrated in FIG.
- the bottom insulating plate 19 has a substantially circular shape in plan view.
- the first through hole 19a has a perfect circle shape in plan view. In the following description, it is assumed that all the through holes have a perfect circular shape in plan view as shown in FIG.
- one first through hole 19a is preferably formed in a range including the center ⁇ (see FIG. 3) of the bottom insulating plate 19, for example, in the middle of the bottom insulating plate 19.
- the first through hole 19a is a gas passage and is used as a hole through which a welding rod passes when the negative electrode lead 18 is welded to the inner surface of the bottom portion 11a.
- the center of the first through hole 19 a coincides with the center of the gas discharge port 21.
- the area of the first through hole 19 a is smaller than the area of the gas discharge port 21, and the entire first through hole 19 a is formed in the gas discharge port 21.
- the area of the first through hole 19a is preferably 10% or more and 45% or less of the total area of the through hole in consideration of the strength of the bottom insulating plate 19, gas flowability, welding operation, and the like, and 15% or more. 40% or less is more preferable. That is, the area of the second through hole 19b is preferably 55% or more and 90% or less, and more preferably 60% or more and 85% or less of the total area of the through holes.
- a plurality of second through holes 19b are formed around the first through hole 19a.
- six second through holes 19b smaller than the first through holes 19a are formed.
- the number of the second through holes 19b is not particularly limited, and may be four as illustrated in FIG.
- the bottom insulating plate 19y shown in FIG. 5 has four second through holes 19by arranged at equal intervals on one concentric circle with the first through hole 19a as the center.
- the first through hole 19a and the plurality of second through holes 19b do not communicate with each other and are spaced apart from each other by a predetermined length.
- the distance from the two through holes 19b is, for example, 0.5 to 2.5 times the diameter of the second through holes 19b.
- Each of the second through holes 19b may be formed at random around the first through hole 19a.
- the first through holes 19b are preferably used. They are formed at equal intervals on one concentric circle centered on the hole 19a.
- a plurality of second through holes 19b having the same shape and the same dimensions are formed on a virtual circle ⁇ centered on the center ⁇ of the bottom insulating plate 19 (the bottom insulating plate 19x, The same applies to 19y).
- the spacing between the second through holes 19b is, for example, about 0.5 to 3 times that of the second through holes 19b.
- the diameter D ⁇ of the virtual circle ⁇ which is a circle formed with a radius from the center ⁇ of the bottom insulating plate 19 to the inner end edge of the second through hole 19b closest to the center ⁇ , is larger than the diameter D 21 of the gas discharge port 21. Small is preferable (see FIG. 2).
- the virtual circle ⁇ passes through the inner end edges of all the second through holes 19b, and the distance between the inner end edge of each second through hole 19b and the center ⁇ is the same. That is, at least a part of each second through hole 19 b is formed in the gas discharge port 21. Specifically, it is preferable that 30% or more of the second through hole 19 b is formed in the gas discharge port 21. If the distance from the first through hole 19a can be secured to some extent and there is no problem in strength, all of the second through hole 19b may be formed in the gas discharge port 21.
- the sealing body 12 having the gas discharge mechanism is illustrated, but the cap opening 27a is not formed in the cap 27 as in the battery 10z illustrated in FIG. 6, and the gas discharge mechanism is not provided.
- the sealing body 12z may be sufficient. In this case, since the gas is released only from the gas discharge port 21 provided in the bottom 11a of the case body 11, there is no need to install an exhaust duct (not shown) on the sealing body 12z side, for example.
- the bottom insulating plate 19 serves as a lid for pressing the electrode body 13 when the gas generated inside the battery is discharged to the outside from the gas discharge port 21. Function. At the time of gas release, the bottom insulating plate 19 prevents the electrode body 13 from popping out by suppressing the movement of the electrode body 13 without breaking or excessive deformation. Thereby, clogging of the electrode body 13 in the gas discharge port 21 is suppressed, and smooth exhaust becomes possible.
- Example 1 [Production of positive electrode] LiNi 0.5 Co 0.2 Mn 0.3 O 2 , acetylene black, and polyvinylidene fluoride (PVdF) were mixed at a weight ratio of 95: 2.5: 2.5. After adding N-methyl-2-pyrrolidone (NMP) as a dispersion medium to the mixture, the mixture was stirred using a mixer (TK Hibismix, manufactured by Primics) to prepare a positive electrode mixture slurry. Subsequently, the positive electrode mixture slurry was applied onto an aluminum foil as a positive electrode current collector, the coating film was dried, and then rolled with a rolling roller. Thus, a positive electrode in which a positive electrode mixture layer having a thickness of 60 ⁇ m and a mixture density of 3.5 g / cm 3 was formed on both surfaces of the aluminum foil was produced.
- NMP N-methyl-2-pyrrolidone
- LiPF 6 was added to a mixed solvent in which ethylene carbonate (EC) and diethyl carbonate (DEC) were mixed at a volume ratio of 3: 7 so that the concentration would be 1.0 mol / L, and a non-aqueous electrolyte was added.
- EC ethylene carbonate
- DEC diethyl carbonate
- a stamp having a depth of 0.2 mm is formed on the bottom of the case body in an annular shape (perfect circle shape) having a diameter of 12 mm from the outside.
- the portion surrounded by the marking on the bottom is the gas outlet.
- the sealing body does not have a gas discharge mechanism.
- a bottom insulating plate A1 is disposed between the bottom of the case body and the electrode body.
- Diameter 16.8mm, thickness: 0.2mm
- Material Glass fiber reinforced phenolic resin
- Young's modulus 70 GPa
- a first through hole having a diameter of 5 mm is formed at the center of the bottom insulating plate A1, and eight second through holes having a diameter of 3 mm are formed at equal intervals around the first through hole.
- the diameter of the virtual circle ⁇ passing through the center of each second through hole is 5.5 mm.
- Opening ratio 28%
- the area ratio of the first through hole and the second through hole is 32%: 68%.
- An upper insulating plate (diameter: 16.8 mm, thickness: 0.2 mm) made of polypropylene having a Young's modulus of 1.5 GPa was disposed between the sealing body and the electrode body.
- the upper insulating plate has a through hole through which the positive electrode lead passes.
- Example 2 A battery was produced in the same manner as in Example 1 except that the bottom insulating plate A2 was used instead of the bottom insulating plate A1.
- Diameter 16.8mm, thickness: 0.2mm
- Material Glass fiber reinforced phenolic resin
- Young's modulus 70 GPa
- a first through hole with a diameter of 4 mm is formed at the center of the bottom insulating plate A2, and six second through holes with a diameter of 3 mm are formed at equal intervals around the first through hole.
- the diameter of the virtual circle ⁇ passing through the center of each second through hole is 5.5 mm.
- Opening ratio 25%, area ratio of first through hole and second through hole is 23%: 77%.
- Example 3 A battery was fabricated in the same manner as in Example 1 except that the bottom insulating plate A3 was used instead of the bottom insulating plate A1.
- Diameter 16.8mm, thickness: 0.2mm
- Material Glass fiber reinforced phenolic resin Young's modulus: 70 GPa
- a first through hole having a diameter of 4 mm is formed at the center of the bottom insulating plate A3, and four second through holes having a diameter of 2.5 mm are formed at equal intervals around the first through hole.
- the diameter of the virtual circle ⁇ passing through the center of each second through hole is 5.25 mm.
- Opening ratio 15%, area ratio of first through hole and second through hole is 39%: 61%.
- Diameter 16.8mm, thickness: 0.2mm
- Material Polypropylene Young's modulus: 1.5 GPa
- Shape, number and arrangement of through holes One through hole having a diameter of 4 mm is formed at the center of the bottom insulating plate R1.
- Diameter 16.8mm, thickness: 0.2mm
- Material Glass fiber reinforced phenolic resin
- Young's modulus 70 GPa
- the diameter of the virtual circle ⁇ passing through the center of each second through hole is 5.55 mm.
- Opening ratio 41%
- area ratio of first through hole and second through hole is 43%: 57%.
- the electrode body and the bottom insulating plate did not protrude from the gas discharge port.
- the electrode body and the bottom insulating plate jumped out of the battery from the gas discharge port, and the gas discharge port was blocked by the electrode body.
- the degree of deformation of the bottom insulating plate of the example was significantly smaller than that of the bottom insulating plate of the comparative example. That is, in the battery of the example, the bottom insulating plate functioned as a lid for pressing the electrode body when gas was released, thereby preventing the electrode body from popping out.
- the present invention can be used for a battery.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Gas Exhaust Devices For Batteries (AREA)
- Secondary Cells (AREA)
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Abstract
Description
[正極の作製]
LiNi0.5Co0.2Mn0.3O2と、アセチレンブラックと、ポリフッ化ビニリデン(PVdF)とを、95:2.5:2.5の重量比で混合した。当該混合物に分散媒としてN-メチル-2-ピロリドン(NMP)を添加した後、混合機(プライミクス社製、T.K.ハイビスミックス)を用いて攪拌し、正極合材スラリーを調製した。続いて、正極集電体であるアルミニウム箔上に正極合材スラリーを塗布し、塗膜を乾燥させた後、圧延ローラにより圧延した。こうして、アルミニウム箔の両面に厚み60μm、合材密度3.5g/cm3の正極合材層が形成された正極を作製した。
人造黒鉛(平均粒径10μm、BET比表面積3m2/g)と、カルボキシメチルセルロースナトリウム(CMC-Na)と、スチレン-ブタジエンゴム(SBR)とを、97.5:1.0:1.5の重量比で混合し、水を添加した。これを混合機(プライミクス製、T.K.ハイビスミックス)を用いて攪拌し、負極合材スラリーを調製した。次に、負極集電体である銅箔上に負極合材スラリーを塗布し、塗膜を乾燥させた後、圧延ローラにより圧延した。こうして、銅箔の両面に厚み75μm、合材密度1.7g/cm3の負極合材層が形成された負極を作製した。
エチレンカーボネート(EC)と、ジエチルカーボネート(DEC)とを、3:7の体積比で混合した混合溶媒に、LiPF6を濃度が1.0mol/Lとなるように添加して非水電解液を調製した。
上記正極にアルミニウムリードを、上記負極にニッケルリードをそれぞれ取り付け、ポリエチレン製のセパレータを介して正極及び負極を渦巻き状に巻回することにより巻回型の電極体を作製した。この電極体を、外径18.1mm、長さ65mm、厚さ0.13mmのニッケルメッキを施した炭素鋼からなる円筒形のケース本体に収容し、上記非水電解液を注入した後、ガスケット及び封口体によりケース本体の開口部を封口して18650型の電池(リチウムイオン二次電池)を作製した。ケース本体の底部には、外側から直径12mmの環状(真円形状)に、深さ0.2mmの刻印(溝)が形成されている。底部の刻印に囲まれた部分がガス排出口である。なお、封口体は、ガス排出機構を有していない。
材質:ガラス繊維強化フェノール樹脂
ヤング率:70GPa
貫通孔の形状、個数、及び配置:図3参照。底部絶縁板A1の中心に直径5mmの第1貫通孔が形成され、その周囲に直径3mmの8つの第2貫通孔が等間隔で形成されている。各第2貫通孔の中心を通る仮想円βの直径は5.5mmである。
底部絶縁板A1の代わりに、底部絶縁板A2を用いたこと以外は、実施例1と同様の方法で電池を作製した。
材質:ガラス繊維強化フェノール樹脂
ヤング率:70GPa
貫通孔の形状、個数、及び配置:図3参照。底部絶縁板A2の中心に直径4mmの第1貫通孔が形成され、その周囲に直径3mmの6つの第2貫通孔が等間隔で形成されている。各第2貫通孔の中心を通る仮想円βの直径は5.5mmである。
底部絶縁板A1の代わりに、底部絶縁板A3を用いたこと以外は、実施例1と同様の方法で電池を作製した。
材質:ガラス繊維強化フェノール樹脂
ヤング率:70GPa
貫通孔の形状、個数、及び配置:図5参照。底部絶縁板A3の中心に直径4mmの第1貫通孔が形成され、その周囲に直径2.5mmの4つの第2貫通孔が等間隔で形成されている。各第2貫通孔の中心を通る仮想円βの直径は5.25mmである。
底部絶縁板A1の代わりに、底部絶縁板R1を用いたこと以外は、実施例1と同様の方法で電池を作製した。
材質:ポリプロピレン
ヤング率:1.5GPa
貫通孔の形状、個数、及び配置:底部絶縁板R1の中心に直径4mmの貫通孔が1つ形成されている。
<比較例2>
底部絶縁板A1の代わりに、底部絶縁板R2を用いたこと以外は、実施例1と同様の方法で電池を作製した。
材質:ガラス繊維強化フェノール樹脂
ヤング率:70GPa
貫通孔の形状、個数、及び配置:図3参照。底部絶縁板R2の中心に直径7mmの貫通孔が形成され、その周囲に直径3.3mmの6つの貫通孔が等間隔で形成されている。各第2貫通孔の中心を通る仮想円βの直径は5.55mmである。
下記の手順で、満充電状態の各電池について釘刺し試験を行った。
(1)環境温度25℃にて、1.0C(2600mA)の定電流で電池電圧が4.2Vになるまで充電を行い、その後定電圧で電流値が0.05C(130mA)になるまで充電を引き続き行った。
(2)電池温度が65℃の環境下で、電池の側面中央部に3mmφの太さの丸釘の先端を接触させ、80mm/secの速度で電池の直径方向に丸釘を突き刺し、丸釘が完全に電池を貫通した時点で丸釘の突き刺しを停止させた。
(3)ケース本体の底部に設けられたガス排出口が開口して電池内部で発生したガスが放出された後、電極体の飛び出しの有無を確認した。
11 ケース本体
11a 底部
12 封口体
13 電極体
14 正極
15 負極
16 セパレータ
17 正極リード
18 負極リード
19 底部絶縁板
19a 第1貫通孔
19b 第2貫通孔
20 上部絶縁板
20a 貫通孔
21 ガス排出口
22 溝
23 フィルタ
24 下弁体
25 絶縁板
26 上弁体
27 キャップ
27a キャップ開口部
28 ガスケット
29 支持部
α 底部絶縁板の中心
β,γ 仮想円
Claims (7)
- 電極体が収容される有底筒状のケース本体と、
前記電極体と前記ケース本体の底部との間に配置される底部絶縁板と、
を備え、
前記ケース本体の底部には、電池内圧が所定圧力に達したときに開口するガス排気口が設けられており、
前記底部絶縁板は、貫通孔を有し、当該絶縁板の総面積に対する前記貫通孔の面積の割合である開口率が10%以上40%以下であり、且つ25℃におけるヤング率が10GPa以上である、電池。 - 前記貫通孔は、前記底部絶縁板の中心を含む範囲に形成された第1貫通孔と、前記第1貫通孔の周囲に複数形成された第2貫通孔とを含む、請求項1に記載の電池。
- 前記各第2貫通孔は、前記第1貫通孔を中心とする1つの同心円上に等間隔で形成される、請求項2に記載の電池。
- 前記底部絶縁板の中心から当該中心に最も近い前記第2貫通孔の内端縁までを半径として形成される円の直径が、前記ガス排気口の直径よりも小さい、請求項2又は3に記載の電池。
- 前記第1貫通孔の面積は、前記貫通孔の総面積の10%以上45%以下である、請求項2~4のいずれか1項に記載の電池。
- ガス排出機構を有し、前記ケース本体の開口部を塞ぐ封口体と、
前記電極体と前記封口体との間に配置される上部絶縁板と、
を備え、
前記底部絶縁板のヤング率は、前記上部絶縁板のヤング率よりも高い、請求項1~5のいずれか1項に記載の電池。 - 前記ガス排気口の開口面積は、前記封口体の前記ガス排出機構の開口面積よりも大きい、請求項6に記載の電池。
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2015
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- 2015-09-17 US US15/521,022 patent/US10541397B2/en active Active
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US20170331090A1 (en) * | 2016-05-16 | 2017-11-16 | Contemporary Amperex Technology Co., Limited | Secondary Battery |
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JPWO2018163495A1 (ja) * | 2017-03-06 | 2019-11-07 | 株式会社村田製作所 | 二次電池 |
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EP3595068A4 (en) * | 2017-03-06 | 2020-12-16 | Murata Manufacturing Co., Ltd. | SECONDARY BATTERY |
JP7111134B2 (ja) | 2017-03-06 | 2022-08-02 | 株式会社村田製作所 | 二次電池 |
JP2020191305A (ja) * | 2017-03-06 | 2020-11-26 | 株式会社村田製作所 | 二次電池 |
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JPWO2018179721A1 (ja) * | 2017-03-27 | 2020-02-06 | パナソニック株式会社 | 二次電池用絶縁板およびそれを備える二次電池 |
CN110226248A (zh) * | 2017-03-27 | 2019-09-10 | 松下电器产业株式会社 | 二次电池用绝缘板及具备该二次电池用绝缘板的二次电池 |
JP2022160617A (ja) * | 2017-03-27 | 2022-10-19 | 三洋電機株式会社 | 二次電池用絶縁板およびそれを備える二次電池 |
JP7123226B2 (ja) | 2017-03-27 | 2022-08-22 | パナソニックホールディングス株式会社 | 二次電池用絶縁板およびそれを備える二次電池 |
US11495855B2 (en) | 2017-03-27 | 2022-11-08 | Panasonic Holdings Corporation | Secondary battery insulating plate and secondary battery including the same |
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WO2018179721A1 (ja) * | 2017-03-27 | 2018-10-04 | パナソニック株式会社 | 二次電池用絶縁板およびそれを備える二次電池 |
JP2021177497A (ja) * | 2017-03-27 | 2021-11-11 | パナソニック株式会社 | 二次電池用絶縁板およびそれを備える二次電池 |
KR102242251B1 (ko) | 2018-01-29 | 2021-04-21 | 주식회사 엘지화학 | 이차 전지 및 이차 전지용 절연판 |
US11532846B2 (en) | 2018-01-29 | 2022-12-20 | Lg Energy Solution, Ltd. | Secondary battery and top insulator for secondary battery |
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US11552358B2 (en) | 2018-01-29 | 2023-01-10 | Lg Energy Solution, Ltd. | Top insulator for secondary battery and method for manufacturing the same |
JP2020524374A (ja) * | 2018-01-29 | 2020-08-13 | エルジー・ケム・リミテッド | 二次電池用絶縁板及びその製造方法 |
JP2020524372A (ja) * | 2018-01-29 | 2020-08-13 | エルジー・ケム・リミテッド | 二次電池及び二次電池用絶縁板 |
JP7340804B2 (ja) | 2018-02-23 | 2023-09-08 | パナソニックIpマネジメント株式会社 | 蓄電デバイス及び蓄電モジュール |
JP2019145478A (ja) * | 2018-02-23 | 2019-08-29 | パナソニックIpマネジメント株式会社 | 蓄電デバイス及び蓄電モジュール |
WO2019163440A1 (ja) * | 2018-02-26 | 2019-08-29 | 三洋電機株式会社 | 非水電解質二次電池 |
JP2022545189A (ja) * | 2019-11-20 | 2022-10-26 | エルジー エナジー ソリューション リミテッド | 二次電池およびそれを含むデバイス |
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Also Published As
Publication number | Publication date |
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JPWO2016067510A1 (ja) | 2017-08-10 |
CN107112472B (zh) | 2020-04-07 |
JP6553078B2 (ja) | 2019-07-31 |
US20170317326A1 (en) | 2017-11-02 |
US10541397B2 (en) | 2020-01-21 |
CN107112472A (zh) | 2017-08-29 |
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