WO2009150912A1 - 電池 - Google Patents
電池 Download PDFInfo
- Publication number
- WO2009150912A1 WO2009150912A1 PCT/JP2009/058754 JP2009058754W WO2009150912A1 WO 2009150912 A1 WO2009150912 A1 WO 2009150912A1 JP 2009058754 W JP2009058754 W JP 2009058754W WO 2009150912 A1 WO2009150912 A1 WO 2009150912A1
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- WO
- WIPO (PCT)
- Prior art keywords
- insulating member
- electrode body
- battery
- battery case
- electrode
- Prior art date
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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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/572—Means for preventing undesired use or discharge
- H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
- H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
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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
- H01M50/60—Arrangements or processes for filling or topping-up with liquids; Arrangements or processes for draining liquids from casings
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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 of a single cell or a single battery
- H01M50/102—Primary casings, jackets or wrappings of a single cell or a single battery characterised by their shape or physical structure
- H01M50/107—Primary casings, jackets or wrappings of a single cell or a single battery characterised by their shape or physical structure having curved cross-section, e.g. round or elliptic
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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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
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/463—Separators, membranes or diaphragms characterised by their shape
- H01M50/466—U-shaped, bag-shaped or folded
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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
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/489—Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties
- H01M50/491—Porosity
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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
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
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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 of a single cell or a single battery
- H01M50/131—Primary casings, jackets or wrappings of a single cell or a single battery characterised by physical properties, e.g. gas-permeability or size
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- 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
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- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Definitions
- the present invention relates to a battery, and more particularly to a battery including an insulating member that insulates a battery case from an electrode body.
- lithium ion batteries In recent years, lithium ion batteries, nickel metal hydride batteries, and other secondary batteries have become increasingly important as on-vehicle power supplies or personal computers and portable terminals.
- a lithium ion battery that is lightweight and obtains a high energy density is expected to be preferably used as a high-output power source mounted on a vehicle.
- a battery structure including a wound electrode body in which a sheet-like positive electrode and a sheet-like negative electrode are laminated together with a separator and wound is known.
- Patent Document 1 discloses a configuration of a secondary battery in which an electrode group is inserted into an insulating member in which a polyimide thin film having a thickness of 50 ⁇ m is formed in a bag shape, and the electrode group and the battery container are electrically insulated. ing. Another technical document is, for example, Patent Document 2.
- the insulating member as described in Patent Document 1 is formed into a bag shape and covers the periphery of the electrode group, the electrolytic solution cannot permeate the insulating member at the time of injecting the electrolytic solution, and the electrolytic solution to the electrode group May impede penetration. As a result, penetration unevenness easily occurs in the electrode group. Further, since the convection of the electrolytic solution is hindered by the insulating member, it takes a long time until the electrolytic solution penetrates the entire electrode group, and the productivity of the battery may be deteriorated.
- the main objective provides the battery provided with the insulating member which can ensure favorable electrolyte solution pouring property while insulating a battery case and an electrode body. That is.
- the battery provided by the present invention includes an electrode body that includes a positive electrode and a negative electrode, and a battery case that houses the electrode body together with an electrolytic solution.
- An insulating member that separates the electrode body from the battery case is disposed between the electrode body and the battery case.
- the insulating member is formed in a bag shape surrounding the electrode body and is made of a porous material having pores through which the electrolytic solution can flow.
- the insulating member that separates the electrode body and the battery case is made of a porous material
- the insulating member can be provided with a permeability that can permeate the electrolytic solution and the like.
- an electrolyte solution can be made to flow (convection) through the pores of the insulating member at the time of injection of the electrolyte solution, and the electrolyte solution can be rapidly infiltrated into the entire electrode body.
- the pouring property of the electrolytic solution is improved, the occurrence of uneven penetration of the electrolytic solution can be suppressed, and the productivity of the battery is improved.
- the pores of the insulating member can be used as vent holes. That is, the gas generated from the electrode body when the battery is abnormal can be smoothly discharged to the outside of the electrode body through the pores of the insulating member. According to such a configuration, the gas generated from the electrode body can be prevented from staying inside the insulating member (contained in the bag-like insulating member). As a result, a battery having excellent safety can be provided.
- the porous material constituting the bag-shaped insulating member has a large number of pores, and the outer surface and the inner surface of the bag-shaped insulating member are communicated with each other by the independent pores (or the connection of a large number of pores). What is necessary is just to be comprised so that it may obtain.
- the shape of the pores is not particularly limited as long as the shape allows the electrolyte solution to flow. For example, any of a slit shape, a cylinder shape, a spherical shape, and the like may be used.
- the porous material constituting the bag-like insulating member is preferably a material having insulating properties and resistance to electrolytic solution (particularly, corrosion resistance to electrolytic solution).
- An example of such a porous material is a porous resin material.
- PE polyethylene
- PP polypropylene
- PTFE polytetrafluoroethylene
- PPS polyphenylene sulfide
- the porous resin material has mechanical strength and chemical stability suitable for the purpose of the present invention, and can be procured at a low cost.
- the electrode body includes a separator interposed between the positive and negative electrodes.
- the average pore diameter (average pore diameter) of the insulating member is preferably smaller than the thickness of the separator.
- the average value (average pore diameter) of the pores formed in the insulating member is obtained by, for example, the bubble point method (JIS K 3832 or JIS B 8356-2).
- the measurement of the pore diameter (average pore diameter or pore diameter distribution) based on the bubble point method can be easily performed using, for example, a commercially available Porometer 3G device manufactured by Nippon Bell Co., Ltd.
- the above configuration it is possible to avoid a situation in which foreign matter larger than the thickness of the separator (for example, welding spatter that may occur when the battery case is sealed) enters the bag-like insulating member through the insulating member.
- foreign matter especially conductive foreign matter
- the foreign matter moves into the electrode body (typically the separator as the electrode body expands or contracts due to charge / discharge).
- the electrode body typically the separator as the electrode body expands or contracts due to charge / discharge.
- Between the positive electrode and the negative electrode penetrates (breaks through) the separator, and crosses between the positive and negative electrodes to cause internal short circuit of the electrode body.
- the insulating member can be provided with a function as a filter against the foreign matter, so that the foreign matter can be prevented from entering the insulating member (and thus inside the electrode body).
- the internal short circuit of an electrode body can be prevented more reliably.
- the separator is a porous separator.
- the average pore diameter of the insulating member is preferably larger than the average pore diameter of the porous separator. If the pore size (pore size distribution) of the insulating member is too small, the electrolyte member cannot be provided with appropriate electrolyte permeability, and the liquid injection property of the electrolyte solution is impaired or the gas generated when the battery is abnormal is contained in the insulating member. It is not preferable because it stays.
- the average pore diameter of the insulating member is larger than the average pore diameter of the porous separator, the permeability of the electrolytic solution or the like to the insulating member can be sufficiently ensured.
- An example of a preferable range of the average pore diameter (based on the measurement method) of the insulating member is 0.1 ⁇ m to 25 ⁇ m, for example.
- the insulating member is formed so as to cover the entire electrode body.
- the entire electrode body without any gaps so that the electrode body surrounded by the insulating member is not exposed to the outside of the insulating member, foreign matter (especially conductive foreign matter larger than the thickness of the separator) can be further mixed into the electrode body. It can be surely prevented.
- FIG. 1A is a top view schematically showing the appearance of a lithium ion secondary battery according to an embodiment of the present invention.
- FIG. 1B is a front view schematically showing the external appearance of the lithium ion secondary battery according to one embodiment of the present invention.
- FIG. 2 is a cross-sectional view schematically showing a II-II cross section of FIG. 1A.
- FIG. 3 is an external perspective view schematically showing the positional relationship between the electrode body and the insulating member according to one embodiment of the present invention.
- FIG. 4 is a schematic diagram for explaining the flow of the electrolyte injected into the battery case according to the embodiment of the present invention.
- FIG. 5 is a schematic diagram for conceptually explaining the internal short circuit of the electrode body due to the contamination of the foreign matter according to the embodiment of the present invention.
- FIG. 6 is a side view schematically showing a vehicle (automobile) provided with a battery according to an embodiment of the present invention.
- battery refers to a power storage device that can extract predetermined electrical energy, and is not limited to a specific power storage mechanism (configuration of electrode body or electrolyte).
- a lithium secondary battery such as a lithium ion battery, a nickel hydride secondary battery or other secondary battery, or a capacitor such as an electric double layer capacitor (that is, a physical battery) is a typical example included in the battery herein.
- electrode body refers to a structure that includes at least one positive electrode and one negative electrode and forms the main body of a battery (power storage device).
- FIG. 1A is a top view schematically showing the appearance of the lithium ion secondary battery according to the present embodiment
- FIG. 1B is a front view thereof.
- a lithium ion secondary battery 100 disclosed herein includes an electrode body 80 (FIG. 2) including a positive electrode 82 and a negative electrode 84, and a battery case 50 that houses the electrode body 80. Is provided.
- the battery case 50 includes a battery case main body 52 and a lid body 54.
- the battery case main body 52 has a shape that can accommodate the electrode body 80 (FIG. 2).
- the battery case main body 52 has a box shape that can accommodate the flat electrode body 80.
- the battery case main body 52 has an upper opening end 53, and is configured to accommodate the electrode body 80 via the upper opening end 53.
- the lid 54 is a member that closes the upper opening end 53 of the battery case main body 52, and in this embodiment, a substantially rectangular plate-like member is suitably used.
- the material of the battery case main body 52 and the lid 54 is preferably a light metal material with good thermal conductivity, and for example, aluminum, stainless steel, nickel-plated steel, or the like can be preferably used.
- a safety valve 70 is provided on the upper surface of the lid 54 in the same manner as a conventional battery case.
- the safety valve 70 has a valve body (not shown) that is deformed for safety when the pressure in the battery case 50 rises abnormally, and internal gas or the like is generated from a gap formed between the valve body and the lid body 54. It is configured to be released.
- a liquid injection port 62 is provided on the upper surface of the lid 54. The liquid injection port 62 can accommodate the electrolytic solution in the battery case 50 through the liquid injection port 62, and is normally sealed with a sealing plug 60.
- a nonaqueous electrolytic solution in which an electrolyte is dissolved in a nonaqueous solvent can be used.
- a mixed solvent of diethyl carbonate and ethylene carbonate for example, a mass ratio of 1: 1 is used as the non-aqueous solvent
- lithium hexafluorophosphate (LiPF 6 ) is used as the electrolyte
- the concentration is It is adjusted to about 1 mol / liter.
- FIG. 2 is a cross-sectional view schematically showing the II-II cross section of FIG. 1A
- FIG. 3 is an external perspective view schematically showing the positional relationship between the electrode body 80 and the insulating member 20. As shown in FIG.
- the electrode body 80 is accommodated in the battery case 50 together with the electrolytic solution.
- the electrode body 80 includes a positive electrode 82 and a negative electrode 84, and a separator 86 interposed between the positive and negative electrodes, like the electrode body of a normal lithium ion battery.
- the electrode body 80 was obtained by laminating the positive electrode sheet 82 and the negative electrode sheet 84 together with a total of two separator sheets 86, and further winding the positive electrode sheet 82 and the negative electrode sheet 84 while slightly shifting them. This is a flat wound electrode body 80 produced by crushing and curling the wound body from the side.
- the ends of the positive electrode sheet 82 and the negative electrode sheet 84 are respectively wound core portions 81 (that is, the positive electrode).
- the positive electrode active material layer forming portion of the sheet 82, the negative electrode active material layer forming portion of the negative electrode sheet 84, and the separator sheet 86 are closely wound around).
- a positive electrode lead terminal 82B and a negative electrode lead terminal 84B are attached to such a positive electrode side protruding portion (ie, a non-forming portion of the positive electrode active material layer) 82A and a negative electrode side protruding portion (ie, a non-forming portion of the negative electrode active material layer) 84A.
- a positive electrode side protruding portion ie, a non-forming portion of the positive electrode active material layer
- a negative electrode side protruding portion ie, a non-forming portion of the negative electrode active material layer
- the positive electrode terminal 42 and the negative electrode terminal 44 are respectively attached to the lid body 54 of the battery case 50 via a gasket (not shown).
- the materials and members constituting the wound electrode body 80 may be the same as those of a conventional lithium ion battery, and are not particularly limited.
- the positive electrode sheet 82 is formed by applying a positive electrode active material layer for a lithium ion battery on a long positive electrode current collector (in this embodiment, an aluminum foil).
- the negative electrode sheet 84 is formed by applying a negative electrode active material layer for a lithium ion battery on a long negative electrode current collector (copper foil in this embodiment).
- a suitable separator sheet 86 interposed between the positive and negative electrode sheets 82 and 84 a sheet composed of a porous polyolefin resin can be used.
- a porous separator sheet made of synthetic resin for example, made of polyolefin such as polyethylene
- a thickness of 5 to 30 ⁇ m (25 ⁇ m in this embodiment) and an average pore diameter of about 0.1 ⁇ m can be preferably used.
- an insulating member 20 that separates the electrode body 80 and the battery case 50 is disposed.
- the insulating member 20 is formed in a bag shape surrounding (preferably enclosing) the electrode body 80.
- the insulating member 20 has a bottomed box shape with the upper end opened, and can accommodate the flat electrode body 80 via the upper end opening 22.
- the insulating member 20 is configured to cover a portion (bottom surface and side surface) excluding the upper surface of the flat electrode body 80 without a gap.
- the thickness of the bag-like insulating member 20 is not particularly limited as long as it has a required strength, and is about 0.1 mm, for example.
- the insulating member 20 is made of a porous material having pores (not shown) through which the above-described electrolytic solution can flow.
- the porous material constituting the insulating member 20 has a large number of pores, and the outer surface and the inner surface of the bag-shaped insulating member 20 can be communicated with each other by the independent pores (or the connection of a large number of pores). It has become.
- the shape of the pores is not particularly limited as long as the shape allows the electrolyte solution to flow. For example, any of a slit shape, a cylinder shape, and the like may be used.
- the porous material constituting the insulating member is preferably a material having insulating properties and resistance to electrolytic solution (particularly, corrosion resistance to electrolytic solution).
- porous material examples include a porous resin material.
- a porous resin material for example, polyethylene (PE), polypropylene (PP), polytetrafluoroethylene (PTFE), polyphenylene sulfide (PPS), or a combination thereof can be suitably used.
- the porous resin material has mechanical strength and chemical stability suitable for the purpose of the present embodiment, and can be procured at a low cost.
- Such a porous resin material can be made, for example, by applying a known baking method to a powdery resin material.
- the bag-shaped insulating member 20 that separates the electrode body 80 and the battery case 50 is made of a porous material, the bag-shaped insulating member 20 has a permeability that allows an electrolytic solution or the like to pass therethrough. Can be granted. Thereby, the electrolyte solution can be moved (convection) through the pores of the bag-like insulating member 20 when the electrolyte solution is injected, and the electrolyte solution can be rapidly permeated into the entire electrode body 80. For example, as shown in FIG.
- the injected electrolyte (arrow “90”) is thinned by the bag-like insulating member 20.
- the inside of the battery case 50 flows (convects) through the hole and goes around the outside of the electrode body 80 without being blocked by the insulating member 20.
- the electrolytic solution can be rapidly penetrated into the entire electrode body 80 (in a short time).
- the pouring property of the electrolytic solution is improved, the occurrence of uneven penetration of the electrolytic solution can be suppressed, and the productivity of the battery is improved.
- the pores of the insulating member 20 can be used as vent holes. That is, the gas generated from the electrode body 80 when the battery is abnormal can be smoothly discharged to the outside of the electrode body 80 through the pores of the insulating member 20. According to such a configuration, the gas generated from the electrode body 80 can be prevented from staying inside the insulating member 20 (contained in the bag-like insulating member). As a result, the battery 100 having excellent safety can be provided.
- the average pore diameter of the insulating member 20 is preferably larger than the average pore diameter of the porous separator sheet 86. If the pore diameter of the insulating member 20 is too small, it becomes difficult for the electrolyte solution or the like to pass through the pores, so that the electrolyte member cannot be provided with appropriate electrolyte permeability and the liquid injection property of the electrolyte solution is impaired. This is because gas generated at the time of battery abnormality stays in the insulating member 20.
- the average pore diameter of the insulating member 20 is preferably smaller than the thickness of the porous separator sheet 86 included in the electrode body 80. For example, a size about 1 ⁇ 2 of the thickness of the porous separator sheet 86 is appropriate.
- conductive foreign matter 92 for example, welding spatter that may be generated when the battery case main body 52 and the lid 54 are joined, or fine metal powder attached to the inner surface of the battery case 50 is attached to the inner surface of the battery case 50.
- the attached conductive foreign matter 92 may enter the bag-like insulating member 20 through the pores of the bag-like insulating member 20 together with the electrolyte.
- the conductive foreign material 92 enters the insulating member 20 together with the electrolytic solution in this way, the foreign material 92 that has entered the electrode body 80 (typically a separator sheet) as the electrode body 80 expands and contracts due to charge and discharge. 86 and the gap between the positive and negative sheets 82 and 84).
- the foreign matter 92 that has entered is larger than the thickness of the separator sheet 86, the foreign matter 92 penetrates (breaks through) the separator sheet 86 in the thickness direction, as shown in FIG. Cross-linking between the sheets 82 and 84 may cause an internal short circuit of the electrode body 80.
- the insulating member 20 is used as a filter for the foreign matter (foreign matter larger than the thickness of the separator 86) 92.
- a function can be imparted and the foreign matter 92 can be prevented from entering the insulating member 20 through the pores of the insulating member 20.
- an internal short circuit of the electrode body 80 can be prevented.
- foreign matter smaller than the average pore diameter of the porous separator sheet 86 may enter the bag of the insulating member 20. Even if it enters the body 80, it does not penetrate the separator sheet 86 and cannot cause an internal short circuit of the electrode body 80.
- a preferable range of the average pore diameter of the insulating member 20 is in the range of about 0.1 ⁇ m to 25 ⁇ m, for example, preferably in the range of 0.1 ⁇ m to 15 ⁇ m. By setting it in such a range, it is possible to prevent an internal short circuit of the electrode body 80 by blocking foreign matter intrusion into the insulating member 20 while imparting appropriate electrolyte solution permeability to the insulating member 20. it can.
- a positive electrode sheet 82 (thickness of about 100 ⁇ m) in which a positive electrode active material layer for a lithium ion battery is formed on the surface of an aluminum foil as a positive electrode current collector, and a negative electrode for a lithium ion battery on a copper foil surface as a negative electrode current collector
- the negative electrode sheet 84 (thickness of about 100 ⁇ m) on which the active material layer is formed is wound through two porous separator sheets (thickness of 25 ⁇ m, pore diameter of about 0.1 ⁇ m), and the wound A flat wound electrode body 80 was produced by crushing the body from the side surface direction.
- the wound electrode body 80 obtained in this way was inserted into the bag-like insulating member 20 whose upper end was opened.
- the bag-like insulating member 20 As the bag-like insulating member 20, a porous polypropylene (PP) member was used, and the average pore diameter was about 15 ⁇ m. Thereafter, the wound electrode body 80 was accommodated in the battery case main body 52 together with the bag-shaped insulating member 20, and the opening of the battery case main body 52 was sealed with the lid 54 by welding. Both the battery case main body 52 and the lid body 54 are made of aluminum, and the dimensions of the battery case main body 52 are 150 mm long ⁇ 30 mm wide ⁇ 100 mm high, and the lid 54 is 150 mm long ⁇ 30 mm wide ⁇ thickness (plate thickness). ) 3 mm. Thus, an evaluation battery (Example 1) before injecting the electrolyte was constructed.
- PP polypropylene
- Comparative Example 1 an evaluation battery that does not use the bag-like insulating member 20 was produced. That is, in the comparative example 1, the wound electrode body 80 is directly accommodated in the battery case 50 without the bag-shaped insulating member 20 being interposed (without being inserted into the bag-shaped insulating member 20). An evaluation battery according to Comparative Example 1 was produced under the same conditions as in Example 1 except that the bag-like insulating member 20 was not used. Further, as Comparative Example 2, an evaluation battery was produced using a bag-like insulating member that was not made porous. That is, in Comparative Example 2, an evaluation battery was manufactured using a non-porous insulating member made of polypropylene (PP) in which no pores were formed. An evaluation battery according to Comparative Example 2 was produced under the same conditions as in Example 1 except that an insulating member that was not made porous was used.
- PP polypropylene
- the presence or absence of uneven penetration of the electrolytic solution was examined by injecting the electrolytic solution into the evaluation batteries according to Example 1 and Comparative Examples 1 and 2 manufactured as described above. Moreover, before pouring the said electrolyte solution, copper powder was mixed beforehand in the battery case 50, and when the said electrolyte solution was inject
- copper powder two types of commercially available ones having different particle sizes (Fukuda Metal Foil Powder Industry Co., Ltd., CE-8A and FCC-115 mixed at a ratio of 8: 2 1 g, see Table 2) are used. It was.
- the injection of the electrolytic solution is performed by injecting the electrolytic solution from the liquid inlet 62 of the lid 54 after repeating the decompression / atmospheric pressure release in the battery case 50 three times in order to promote the penetration of the electrolytic solution. It was. After injecting the electrolytic solution, it is left in that state for 1 hour, and then the wound electrode body 80 is taken out from the battery case 50 and disassembled, and the number and size of the copper powder that has entered between the positive electrode sheet 82 and the negative electrode sheet 84 are determined. Weighed. Further, the penetration unevenness of the electrolytic solution with respect to the wound electrode body 80 was visually confirmed. The results are shown in Table 1.
- the positive electrode sheet 82 is formed by applying a positive electrode active material layer for a lithium ion battery on a long positive electrode current collector.
- a positive electrode active material layer for a lithium ion battery is preferably used for the positive electrode current collector.
- an aluminum foil (this embodiment) or other metal foil suitable for the positive electrode is preferably used.
- the positive electrode active material one or more of materials conventionally used in lithium ion batteries can be used without any particular limitation. Preferable examples include LiMn 2 O 4 , LiCoO 2 , LiNiO 2 and the like.
- an aluminum foil having a length of 2 to 4 m (for example, 2.7 m), a width of 8 to 12 cm (for example, 10 cm), and a thickness of about 5 to 20 ⁇ m (for example, 15 ⁇ m) is used as a current collector.
- a positive electrode active material layer for lithium ion batteries mainly composed of lithium nickelate is formed by a conventional method (for example, lithium nickelate 88% by mass, acetylene black 10% by mass, polytetrafluoroethylene 1% by mass, carboxymethylcellulose 1% by mass).
- a suitable positive electrode sheet 82 is obtained.
- the negative electrode sheet 84 may be formed by applying a negative electrode active material layer for a lithium ion battery on a long negative electrode current collector.
- a copper foil (this embodiment) or other metal foil suitable for the negative electrode is preferably used.
- the negative electrode active material one or more of materials conventionally used in lithium ion batteries can be used without any particular limitation. Preferable examples include carbon-based materials such as graphite carbon and amorphous carbon, lithium-containing transition metal oxides and transition metal nitrides.
- a copper foil having a length of 2 to 4 m (for example, 2.9 m), a width of 8 to 12 cm (for example, 10 cm) and a thickness of about 5 to 20 ⁇ m (for example, 10 ⁇ m) is used.
- a suitable negative electrode sheet 84 is obtained by forming a negative electrode active material layer (for example, 98% by mass of graphite, 1% by mass of styrene butadiene rubber, and 1% by mass of carboxymethyl cellulose) for lithium ion batteries.
- a separator sheet made of a porous polyolefin-based resin can be cited.
- a porous separator sheet made of a synthetic resin for example, made of polyolefin such as polyethylene
- the electrode body accommodated in a battery case is not limited to the said winding type.
- it may be a laminated type electrode body in which positive electrode sheets and negative electrode sheets are alternately laminated together with separators.
- a nonaqueous electrolytic solution in which an electrolyte is dissolved in a nonaqueous solvent
- Nonaqueous solvents include ethylene carbonate, propylene carbonate, dimethyl carbonate (DMC), diethyl carbonate, ethyl methyl carbonate (EMC), 1,2-dimethoxyethane, 1,2-diethoxyethane, tetrahydrofuran, 1,3-dioxolane. 1 type, or 2 or more types selected from the group which consists of etc. can be used.
- the electrolyte (supporting salt) one or more selected from various lithium salts containing fluorine as a constituent element can be used.
- LiPF 6 LiBF 4 , LiAsF 6 , LiCF 3 SO 3 , LiC 4 F 9 SO 3 , LiN (CF 3 SO 2 ) 2 , LiC (CF 3 SO 2 ) 3, or the like
- LiPF 6 LiPF 6
- LiBF 4 LiAsF 6
- LiCF 3 SO 3 LiC 4 F 9 SO 3
- LiN (CF 3 SO 2 ) 2 LiC (CF 3 SO 2 ) 3, or the like
- the insulating member 20 has a bottomed box shape (bag shape) with an upper end opened, but may have a bag shape with no upper end opened. That is, you may use the bag-shaped insulating member 20 with which the upper end opening part 22 was sealed so that the circumference
- the type of battery is not limited to the above-described lithium ion secondary battery, and batteries having various contents with different electrode body constituent materials and electrolytes, for example, capacitors such as nickel hydrogen batteries, nickel cadmium batteries, or electric double layer capacitors (that is, electric double layer capacitors). , Physical battery).
- the battery provided by the present invention can be suitably used as a power source for a motor (electric motor) mounted on a vehicle such as an automobile as shown in FIG. That is, the battery according to the present invention is used as a unit cell, and a plurality of the cells are arranged in a predetermined direction in an electrically connected state, and the plurality of unit cells are constrained in the arrangement direction.
- Pack 10 can be constructed. Therefore, according to the present invention, a vehicle 1 (typically an automobile equipped with an electric motor such as an automobile, particularly a hybrid automobile, an electric automobile, or a fuel cell automobile) provided with such an assembled battery (that is, the battery according to the invention) 10 as a power source. Can be provided.
- the configuration of the present invention it is possible to provide a battery provided with an insulating member that can insulate a battery case and an electrode body and ensure good electrolyte solution pouring property.
Abstract
Description
なお、本国際出願は2008年6月13日に出願された日本国特許出願2008-155596号に基づく優先権を主張しており、その出願の全内容は本明細書中に参照として組み入れられている。
Claims (6)
- 正極および負極を備える電極体と、
前記電極体を電解液とともに収容する電池ケースと
を備え、
前記電極体と前記電池ケースとの間には、当該電極体と電池ケースとを隔離する絶縁部材が配置されており、
前記絶縁部材は、前記電極体を包囲する袋状に形成され、且つ、前記電解液を流通し得る細孔を有する多孔質材料から構成されていることを特徴とする、電池。 - 前記電極体は、前記正負の電極間に介在するセパレータを備え、
前記絶縁部材の平均細孔径は、前記セパレータの厚みよりも小さいことを特徴とする、請求項1に記載の電池。 - 前記セパレータは、多孔質セパレータであり、
前記絶縁部材の平均細孔径は、前記多孔質セパレータの平均細孔径よりも大きいことを特徴とする、請求項2に記載の電池。 - 前記絶縁部材の平均細孔径は、0.1μm~25μmである、請求項1に記載の電池。
- 前記絶縁部材は、前記電極体の全体を被覆し得るように形成されている、請求項1に記載の電池。
- 請求項1に記載の電池を備える車両。
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/996,789 US8945775B2 (en) | 2008-06-13 | 2009-05-11 | Battery having a porous insulating member |
KR1020117000827A KR101232459B1 (ko) | 2008-06-13 | 2009-05-11 | 전지 |
CN200980122161.5A CN102067355B (zh) | 2008-06-13 | 2009-05-11 | 电池 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2008155596A JP4470124B2 (ja) | 2008-06-13 | 2008-06-13 | 電池 |
JP2008-155596 | 2008-06-13 |
Publications (1)
Publication Number | Publication Date |
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WO2009150912A1 true WO2009150912A1 (ja) | 2009-12-17 |
Family
ID=41416623
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2009/058754 WO2009150912A1 (ja) | 2008-06-13 | 2009-05-11 | 電池 |
Country Status (5)
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US (1) | US8945775B2 (ja) |
JP (1) | JP4470124B2 (ja) |
KR (1) | KR101232459B1 (ja) |
CN (1) | CN102067355B (ja) |
WO (1) | WO2009150912A1 (ja) |
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KR101232459B1 (ko) | 2013-02-12 |
KR20110018439A (ko) | 2011-02-23 |
US8945775B2 (en) | 2015-02-03 |
US20110086265A1 (en) | 2011-04-14 |
JP2009301892A (ja) | 2009-12-24 |
CN102067355B (zh) | 2015-04-22 |
CN102067355A (zh) | 2011-05-18 |
JP4470124B2 (ja) | 2010-06-02 |
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