WO2022145125A1 - 電気デバイス - Google Patents
電気デバイス Download PDFInfo
- Publication number
- WO2022145125A1 WO2022145125A1 PCT/JP2021/039562 JP2021039562W WO2022145125A1 WO 2022145125 A1 WO2022145125 A1 WO 2022145125A1 JP 2021039562 W JP2021039562 W JP 2021039562W WO 2022145125 A1 WO2022145125 A1 WO 2022145125A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- lead terminal
- current collector
- electrical device
- battery
- solder material
- Prior art date
Links
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- PXKLMJQFEQBVLD-UHFFFAOYSA-N bisphenol F Chemical compound C1=CC(O)=CC=C1CC1=CC=C(O)C=C1 PXKLMJQFEQBVLD-UHFFFAOYSA-N 0.000 description 4
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- 150000004767 nitrides Chemical class 0.000 description 2
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- 229910000733 Li alloy Inorganic materials 0.000 description 1
- 229910009290 Li2S-GeS2-P2S5 Inorganic materials 0.000 description 1
- 229910009324 Li2S-SiS2-Li3PO4 Inorganic materials 0.000 description 1
- 229910009328 Li2S-SiS2—Li3PO4 Inorganic materials 0.000 description 1
- 229910009110 Li2S—GeS2—P2S5 Inorganic materials 0.000 description 1
- 229910009130 Li2S—GeS2—ZnS Inorganic materials 0.000 description 1
- 229910007295 Li2S—SiS2—Li3PO4 Inorganic materials 0.000 description 1
- 229910010199 LiAl Inorganic materials 0.000 description 1
- 229910012851 LiCoO 2 Inorganic materials 0.000 description 1
- 229910010707 LiFePO 4 Inorganic materials 0.000 description 1
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- 229910015672 LiMn O Inorganic materials 0.000 description 1
- 229910013641 LiNbO 3 Inorganic materials 0.000 description 1
- 229910013716 LiNi Inorganic materials 0.000 description 1
- 229910002995 LiNi0.8Co0.15Al0.05O2 Inorganic materials 0.000 description 1
- 229910013391 LizN Inorganic materials 0.000 description 1
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 229910019942 S—Ge Inorganic materials 0.000 description 1
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- FDLZQPXZHIFURF-UHFFFAOYSA-N [O-2].[Ti+4].[Li+] Chemical group [O-2].[Ti+4].[Li+] FDLZQPXZHIFURF-UHFFFAOYSA-N 0.000 description 1
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- 229910052791 calcium Inorganic materials 0.000 description 1
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- 238000007607 die coating method Methods 0.000 description 1
- QHGJSLXSVXVKHZ-UHFFFAOYSA-N dilithium;dioxido(dioxo)manganese Chemical compound [Li+].[Li+].[O-][Mn]([O-])(=O)=O QHGJSLXSVXVKHZ-UHFFFAOYSA-N 0.000 description 1
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- 239000001989 lithium alloy Substances 0.000 description 1
- 229910000625 lithium cobalt oxide Inorganic materials 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical group [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- RSNHXDVSISOZOB-UHFFFAOYSA-N lithium nickel Chemical compound [Li].[Ni] RSNHXDVSISOZOB-UHFFFAOYSA-N 0.000 description 1
- GQYHUHYESMUTHG-UHFFFAOYSA-N lithium niobate Chemical compound [Li+].[O-][Nb](=O)=O GQYHUHYESMUTHG-UHFFFAOYSA-N 0.000 description 1
- 229910001386 lithium phosphate Inorganic materials 0.000 description 1
- GLNWILHOFOBOFD-UHFFFAOYSA-N lithium sulfide Chemical compound [Li+].[Li+].[S-2] GLNWILHOFOBOFD-UHFFFAOYSA-N 0.000 description 1
- BFZPBUKRYWOWDV-UHFFFAOYSA-N lithium;oxido(oxo)cobalt Chemical compound [Li+].[O-][Co]=O BFZPBUKRYWOWDV-UHFFFAOYSA-N 0.000 description 1
- VROAXDSNYPAOBJ-UHFFFAOYSA-N lithium;oxido(oxo)nickel Chemical compound [Li+].[O-][Ni]=O VROAXDSNYPAOBJ-UHFFFAOYSA-N 0.000 description 1
- 229910001425 magnesium ion Inorganic materials 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 239000010450 olivine Substances 0.000 description 1
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- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Chemical compound [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 1
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- TWQULNDIKKJZPH-UHFFFAOYSA-K trilithium;phosphate Chemical compound [Li+].[Li+].[Li+].[O-]P([O-])([O-])=O TWQULNDIKKJZPH-UHFFFAOYSA-K 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/653—Means for temperature control structurally associated with the cells characterised by electrically insulating or thermally conductive materials
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/14—Arrangements or processes for adjusting or protecting hybrid or EDL capacitors
- H01G11/18—Arrangements or processes for adjusting or protecting hybrid or EDL capacitors against thermal overloads, e.g. heating, cooling or ventilating
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/74—Terminals, e.g. extensions of current collectors
-
- 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
-
- 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
- H01M50/552—Terminals characterised by their shape
- H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
-
- 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
- H01M50/564—Terminals characterised by their manufacturing process
- H01M50/566—Terminals characterised by their manufacturing process by welding, soldering or brazing
-
- 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
- H01M50/581—Devices or arrangements for the interruption of current in response to temperature
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/0204—Non-porous and characterised by the material
- H01M8/0206—Metals or alloys
- H01M8/0208—Alloys
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/0204—Non-porous and characterised by the material
- H01M8/0223—Composites
- H01M8/0228—Composites in the form of layered or coated products
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/0247—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the form
-
- 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
-
- 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
- This disclosure relates to electrical devices.
- Patent Document 1 discloses a heat blocking mechanism that cuts off an electrical connection between a battery cell terminal and a current collector when the battery cell generates heat. .. Specifically, in this heat cutoff mechanism, the terminal of the lead connecting the terminal of the battery cell and the current collector is soldered to the bottom surface of the exterior on the negative electrode side, which is the terminal of the battery cell, and is equal to or higher than the melting temperature of the solder.
- Patent Document 2 discloses a battery in which a solder material, which is a low melting point material, is provided between a positive electrode plate and a terminal of a safety element electrically connected to the positive electrode plate. In the battery of Patent Document 2, the solder material melts as the battery temperature rises, so that the electrical connection between the positive electrode plate and the terminal of the safety element is cut off.
- a solder material which is a low melting point material
- An electric device equipped with an electric element such as a battery is required to prevent ignition or smoke combustion due to abnormal heat generation of the electric element.
- conventional electrical devices equipped with the above-mentioned mechanism for dealing with this problem are not sufficiently reliable and have room for improvement.
- the present disclosure provides an electric device having high reliability.
- the electrical devices of the present disclosure are An electrical element with a current collector, A lead terminal electrically connected to the current collector, A joint portion containing a conductive resin material and joining the current collector and the lead terminal, and a hot melt portion located between the joint portion and the lead terminal and containing a solder material. To prepare for.
- the present disclosure provides an electrical device with high reliability.
- FIG. 1 is a diagram showing a schematic configuration of a battery 1100 according to the first embodiment.
- FIG. 2 is a diagram showing a schematic configuration of the battery 1200 according to the second embodiment.
- FIG. 3 is an enlarged cross-sectional view of the periphery of the joint portion in the battery 1300 according to the third embodiment.
- FIG. 4 is an enlarged cross-sectional view of the periphery of the joint portion in the battery 1300A of the modified example of the battery 1300 according to the third embodiment. It is a figure which shows the schematic structure.
- FIG. 5 is an enlarged cross-sectional view of the periphery of the joint portion in the battery 1400 according to the fourth embodiment. It is a figure which shows the schematic structure.
- FIG. 6 is an enlarged cross-sectional view of the periphery of the joint portion in the battery 1500 according to the fifth embodiment.
- Patent Documents 1 and 2 disclose a battery using a technique for suppressing an increase in battery temperature.
- Patent Document 1 as a heat cutoff mechanism, the terminal of the lead connecting the terminal of the battery cell and the current collector is soldered to the bottom surface of the exterior on the negative electrode side, which is the terminal of the battery cell, and is equal to or higher than the melting temperature of the solder. Disclosed is a mechanism in which the electrical connection between the battery cell and the current collector is cut off when the lead terminal is separated from the battery cell terminal.
- the all-solid-state battery at such a short distance where heat is easily transferred or directly to the all-solid-state battery, cracks are likely to occur at the interface between the electrode layer and the solid electrolyte in the all-solid-state battery, for example, due to thermal impact.
- Patent Document 2 discloses a battery in which a solder material, which is a low melting point material, is provided between a positive electrode plate and a terminal of a safety element electrically connected to the positive electrode plate. Specifically, a solder material, which is a low melting point material, is provided between the positive electrode plate of the battery element, the positive electrode terminal connected via the positive electrode current collecting member, and the terminal provided in the safety element. In the battery of Patent Document 2, the solder material melts as the battery temperature rises, so that the electrical connection between the positive electrode plate and the terminal of the safety element is cut off.
- a solder material which is a low melting point material
- the present inventor has diligently studied an electric device equipped with an electric element, such as a battery equipped with a battery element, in order to solve the above-mentioned problems of the prior art and further improve the reliability. As a result, the present inventor has completed the electric device of the present disclosure shown below.
- each figure is not necessarily exactly illustrated.
- substantially the same configuration is designated by the same reference numerals, and duplicate description is omitted or simplified.
- the x-axis, y-axis, and z-axis indicate the three axes of the three-dimensional Cartesian coordinate system.
- the z-axis direction is the thickness direction of the battery, which is an example of an electric device.
- the "thickness direction” is a direction perpendicular to the surface on which each layer is laminated.
- planar view means a case where the battery is viewed along the stacking direction in a battery which is an example of an electric device
- thickness in the present specification means the stacking of the battery and each layer. The length in the direction.
- inside and “outside” in “inside” and “outside” mean that the center side of the battery is “inside” when the battery is viewed along the stacking direction in a battery which is an example of an electric device. And the peripheral side of the battery is “outside”.
- up and down in a battery configuration refer to up (ie, vertically up) and down (ie, vertically down) in absolute spatial perception. It does not refer to it, but is used as a term defined by the relative positional relationship based on the stacking order in the stacking configuration.
- the terms “upper” and “lower” are used not only when the two components are spaced apart from each other and another component exists between the two components, but also when the two components are present. It also applies when the two components are placed in close contact with each other and touch each other.
- the electric device includes an electric element provided with a current collector, a joint portion, a heat melting portion, and a lead terminal.
- the lead terminal is electrically connected to the current collector.
- the joint portion contains a conductive resin material and joins the current collector and the lead terminal.
- the hot melt portion is located between the joint portion and the lead terminal and contains a solder material. That is, the current collector and the lead terminal are joined to each other via a joint portion and a heat melting portion.
- the electric device when the electric device generates heat due to abnormal heat generation of the electric element, the solder material of the heat melting part melts and the lead terminal is separated from the joint part. As a result, the electrical device can be electrically disconnected from the external circuit. Further, in the electric device according to the first embodiment, since the current collector and the lead terminal are joined by the joint portion containing the conductive resin material, when the lead terminal is soldered to the current collector as in the prior art. It is possible to suppress the generation of cracks due to the thermal shock of. As described above, the electric device according to the first embodiment includes a mechanism for cutting off the current due to abnormal heat generation without deteriorating the performance of the electric device. The electrical device according to the first embodiment is suppressed from firing or emitting smoke and has high reliability.
- a battery equipped with a battery element such as a secondary battery element as an electric element
- the electric device of the present disclosure is not limited to the following batteries.
- the following description may apply to all electrical devices equipped with electrical elements.
- Other examples of electrical elements are power generation elements such as solar cell elements and fuel cell elements, storage elements such as capacitors, and the like.
- Other examples of the electrical devices of the present disclosure are power generation devices such as solar cells and fuel cells, power storage devices, and the like.
- FIG. 1 is a diagram showing a schematic configuration of a battery 1100 according to the first embodiment.
- FIG. 1A is a cross-sectional view of the battery 1100 according to the first embodiment.
- FIG. 1B is a plan view of the battery 1100 as viewed from above in the z-axis direction.
- FIG. 1 (a) shows a cross section at the position indicated by the line I-I of FIG. 1 (b).
- the battery 1100 includes a battery element 10, a joint portion 16, a heat melting portion 17, and a lead terminal 18.
- the battery element 10 includes a first current collector 11 and a second current collector 15.
- the first current collector 11, the joint portion 16, the heat melting portion 17, and the lead terminal 18 of the battery element 10 are provided in this order.
- the hot melting portion 17 may be in contact with the lead terminal 18.
- the hot melting section 17 may cover the entire surface of the lead terminal 18 as shown in FIG.
- the lead terminal 18 coated on the hot melting portion 17 is hereinafter referred to as "lead terminal 18 having the hot melting portion 17".
- the battery element 10 includes a first current collector 11, a first active material layer 12, a solid electrolyte layer 13, a second active material layer 14, and a second current collector 15 in this order.
- the solid electrolyte layer 13 is arranged between the first active material layer 12 and the second active material layer 14.
- the first current collector 11, the first active material layer 12, the solid electrolyte layer 13, the second active material layer 14, and the second current collector 15 are all rectangular in a plan view.
- the shapes of the first current collector 11, the first active material layer 12, the solid electrolyte layer 13, the second active material layer 14, and the second current collector 15 in a plan view are not particularly limited. Examples of non-rectangular shapes are circles, ellipses, or polygons.
- the first current collector 11 and the second current collector 15 may be collectively referred to as a "current collector”.
- the current collector may be formed of a conductive material.
- the current collector is, for example, stainless steel, nickel, aluminum, iron, titanium, copper, palladium, gold, platinum, or an alloy of two or more of these.
- a foil-like body, a plate-like body, a mesh-like body, or the like of these materials may be used as a current collector.
- the material of the current collector can be selected in consideration of the manufacturing process, working temperature, working pressure, battery operating potential applied to the current collector, or conductivity. Further, the material of the current collector may be selected in consideration of the tensile strength or heat resistance required for the battery.
- the current collector may be, for example, a high-strength electrolytic copper foil or a clad material in which dissimilar metal foils are laminated.
- the current collector may have a thickness of, for example, 10 ⁇ m or more and 100 ⁇ m or less.
- the surface of the current collector is processed into an uneven rough surface in order to improve the adhesion to the active material layer (that is, the first active material layer 12 or the second active material layer 14) or the joint portion 16. May be good. This enhances, for example, the zygosity of the current collector interface and improves the mechanical and thermal reliability and cycle characteristics of the battery. Further, since the contact area between the current collector and the joint portion 16 is increased, the electric resistance is reduced.
- the joint portion 16 contains a conductive resin material.
- the conductive resin material is, for example, a mixture of a resin material and a conductive material.
- a thermosetting resin or a thermoplastic resin can be used as the resin material.
- thermosetting resin is (I) Amino resins such as urea resin, melamine resin, and guanamine resin, (Ii) Epoxy resins such as bisphenol A type, bisphenol F type, phenol novolac type, alicyclic type, etc. (Iii) Oxetane resin, (Iv) a phenol resin such as a resole type or a novolak type, or (v) a silicone-modified organic resin such as a silicone epoxy or a silicone polyester. Only one of these materials may be used for the resin, or two or more of these materials may be used in combination.
- thermoplastic resin for example, a resin having a softening point higher than the melting point of the solder material contained in the heat melting portion 17 is selected.
- metal particles of silver, copper, nickel, zinc, aluminum, palladium, gold, platinum, or an alloy obtained by combining these metals can be used.
- the shape of the metal particles may be any shape such as spherical, flaky, needle-shaped and the like.
- metal particles having a smaller particle size allow the alloy reaction and diffusion to proceed at a lower temperature. Therefore, the particle size and shape of the metal particles are appropriately selected in consideration of the influence of the thermal history on the process design and the battery characteristics.
- the curing temperature of the conductive resin material is lower than the melting point of the solder material contained in the hot melted portion 17.
- the conductive resin material is, for example, a thermosetting conductive resin material containing a thermosetting resin, and may contain at least one selected from the group consisting of silver and copper.
- the joint portion 16 is in contact with, for example, the first current collector 11 and the hot melting portion 17.
- the joint portion 16 is not formed on, for example, the opposite surface of the lead terminal 18 facing the first current collector 11.
- the joint portion 16 may have a thickness of, for example, 1 ⁇ m or more and 50 ⁇ m or less.
- a heat resistant temperature or higher for example, 200 ° C.
- cracks or the like occur in the tissue and the resistance increases. Therefore, in the battery 1100, in addition to the lead terminals 18 being separated by the joint portion 16 when the temperature rises, the joint portion 16 containing the conductive resin material also has an effect of suppressing electrical connection with the outside.
- the conductive resin material constituting the joint portion 16 has a Young's modulus lower than that of the material constituting the current collector, the heat melting portion 17, and the lead terminal 18. good. That is, the conductive resin material constituting the joint portion 16 may be softer than the material constituting the current collector, the heat melting portion 17, and the lead terminal 18. This alleviates the stress at the interface between the battery element 10 or the first current collector 11 and the junction 16 caused by temperature changes or external stress. As a result, the connection reliability between the first current collector 11 and the lead terminal 18 having the hot melting portion 17 is improved. This relative relationship of Young's modulus can be evaluated from the displacement characteristics with respect to the pressure when the probe is pushed in or the magnitude of the dent.
- the joint portion 16 is formed by adjusting the type, shape, and composition of components in consideration of ease of manufacture in the manufacturing process or stress relaxation performance, that is, heat impact resistance or cold heat cycle resistance. obtain.
- the joint portion 16 may have pores.
- the Young's modulus of the junction 16 can be adjusted by the pores.
- the state of the pores at the junction 16 can be confirmed by a conventional cross-section observation technique such as an optical microscope and an electron microscope.
- any cross section can be analyzed by means such as CT-scan.
- the joint portion 16 may further contain another conductive material in addition to the conductive resin material.
- the conductive material may be, for example, a metal powder such as silver, copper, nickel, palladium, and platinum, which is generally used as an electrode.
- a metal powder such as silver, copper, nickel, palladium, and platinum, which is generally used as an electrode.
- the metal powder one in which a plurality of metals having different materials or particle sizes are blended or alloyed may be used after being adjusted to the extent that conductivity or ohmic contact can be ensured.
- the joint portion 16 may further contain particles of a solid electrolyte, an active material, or a current collector material in addition to the conductive resin material.
- the range of the joining portion 16 is not limited as long as the first current collector 11 and the lead terminal 18 can be joined to each other via the hot melting portion 17. Therefore, the joint portion 16 may be formed in at least a part between the first current collector 11 and the heat melting portion 17.
- the joint portion 16 may be formed by pattern printing on the surface of the first current collector 11 or the heat melting portion 17, and may be partially formed.
- the structure of the joint portion 16 is not particularly limited as long as the lead terminal 18 can be separated from the joint portion 16 when the hot melt portion 17 is melted by heat generation.
- the joint portion 16 may be composed of a plurality of different conductive materials.
- conductive materials having different coefficients of thermal expansion or hardness may be laminated. As a result, the stress due to the difference in the coefficient of thermal expansion from the current collector or the lead terminal 18 can be further relaxed, and the connection reliability can be improved.
- the specific gravity of the joint portion 16 is not particularly limited, but it is preferably smaller from the viewpoint of weight energy density. From the viewpoint of weight energy density, a conductive resin material having a small specific gravity is suitable.
- the heat melting unit 17 contains a solder material. As shown in FIG. 1, in the battery 1100 according to the present embodiment, the heat melting unit 17 is in contact with the lead terminal 18.
- the lead terminal 18 may be covered with, for example, a solder material that melts at a low temperature. That is, as shown in FIG. 1, the surface of the lead terminal 18 may be covered with the heat melting portion 17.
- the solder material has a low melting point.
- the solder material may have, for example, a melting point of less than 150 ° C. in order to facilitate the separation of the lead terminal 18 from the bonded body 16 prior to ignition or smoke generation.
- the solder material may contain Sn and Bi.
- the solder material may contain Sn and In. Examples of the solder material having a melting point of less than 150 ° include, for example, a material having Sn42% -Bi58% or Sn48% -In52%.
- the thickness of the heat melting portion 17 may be, for example, 0.3 ⁇ m or more and 10 ⁇ m, or 1 ⁇ m or more and 3 ⁇ m or less.
- the lead terminal 18 may be covered with plating of a solder material. That is, the heat melting portion 17 may be a plating film of a solder material. Hereinafter, plating of a solder material is referred to as "solder plating". From the viewpoint of heat capacity, it is desirable that the heat melting portion 17 is thin.
- the thin heat-melting portion 17 can improve the temperature accuracy and responsiveness at which the lead terminal 18 is separated from the joint portion 16 when heat is generated.
- the thin heat-melting portion 17 is also desirable from the viewpoint of volumetric energy density. According to solder plating, the heat-melting portion 17 can be coated on the lead terminal 18 so as to have a thickness of, for example, 0.5 ⁇ m or more and 5 ⁇ m or less.
- the entire surface of the lead terminal 18 is covered with the heat melting portion 17, but the lead terminal 18 is partially such as only a portion in contact with the joint portion 16 or a joint surface. May be covered with a heat melting portion 17. That is, the lead terminal 18 may be partially plated only at the joint portion by a general partial plating process, such as partial plating at a portion in contact with the joint portion 16 or only at the joint surface. That is, the hot melt portion 17 may be provided only at the joint portion with the joint portion 16 on the surface of the lead terminal 18. This makes it possible to omit extra solder material. As a result, it is possible to suppress a decrease in volume energy density or weight energy density.
- a solder material may be present on the joint surface of the lead terminal 18 and the side surface of the lead terminal 18 via the ridge line.
- the joint surface of the lead terminal 18 is a surface facing the first current collector 11.
- the side surface via the joint surface and the ridgeline is a side surface with respect to the joint surface, that is, a side surface when the joint surface is the front surface.
- the hot melt portion 17 may be in contact with the joint surface and the side surface of the lead terminal 18.
- the lead terminal 18 is provided with the heat melting portion 17 on the side surface as well, so that the lead terminal 18 is connected to the joint portion 16 when heat is generated.
- the temperature of the joint surface of the lead terminal 18 and the side surface of the lead terminal 18 via the ridgeline tends to be lower than that of the joint surface that is in direct contact with the heat generation source. Therefore, it is desirable that the melting temperature of the solder material contained in the heat melting portion 17 provided on the side surface is lower than the melting temperature of the solder material contained in the heat melting portion 17 provided on the joint surface. That is, when the heat melting portion 17 is provided in contact with the joint surface and the side surface of the lead terminal 18, the solder material constituting the heat melting portion 17 has a melting point lower than that of the first solder material and the first solder material. It is desirable that the first solder material is in contact with the joint surface and the second solder material is in contact with the side surface, including the two solder materials.
- the melting temperature of the solder material can be adjusted by selecting the composition ratio of the contained element (for example, Sn, Bi, or In).
- the lead terminal 18 may be a conductor and is not particularly limited, but a lead terminal 18 having a low resistance and a high thermal conductivity is particularly preferable.
- Examples of materials for the lead terminal 18 are stainless steel, nickel, aluminum, iron, titanium, copper, or phosphor bronze.
- the lead terminal 18 may have a thickness of, for example, 200 ⁇ m or more and 3000 ⁇ m or less. From the viewpoint of weight and volume, the lead terminal 18 may have a thickness of, for example, 500 ⁇ m or more and 1000 ⁇ m or less.
- the lead terminal 18 may be formed by punching with a die, or may be formed by etching. In the lead terminal 18, it is desirable that spine-shaped processing burrs having a length of several tens of ⁇ m on the end face are removed by polishing, brushing, or the like. This makes it possible to prevent unnecessary contact with the first current collector 11 after the lead terminal 18 is separated from the first current collector 11 and damage to the first current collector 11.
- the joint surface of the lead terminal 18 is not limited to a flat surface, and may have an uneven structure.
- the joint surface of the lead terminal 18 may have irregularities having a height difference of 1 ⁇ m or more and 1000 ⁇ m or less.
- the joining area between the lead terminal 18 and the joining portion 16 increases, so that the electrical resistance between the lead terminal 18 and the joining portion 16 decreases and the joining strength increases.
- the connection reliability can be further improved while reducing the influence on the battery characteristics due to the provision of the joint portion 16 and the heat melting portion 17.
- the shape of the lead terminal 18 is not limited.
- the cross section of the lead terminal 18 may be rectangular.
- the cross section of the lead terminal 18 may be trapezoidal.
- the surface corresponding to the shorter base of the trapezoid in the cross section is used as the joint surface with the first current collector 11, that is, is bonded to the joint portion 16 via the hot melt portion 17. If so, the frictional resistance on the side surface when the lead terminal 18 is separated from the joint portion 16 is reduced. As a result, the responsiveness in which the lead terminal 18 is separated from the joint portion 16 due to heat generation is improved.
- the cross section of the lead terminal 18 may be triangular.
- the lead terminal 18 is arranged so that the surface including the apex of the triangle in the cross section faces the first current collector 11. That is, in this case, for example, at the lead terminal, the surface including the apex of the triangle in the cross section is joined to the joining portion 16 via the hot melting portion 17.
- the lead terminal 18 may be bent. By having such a bent shape, the lead terminal 18 is easily separated from the joint portion 16 when the hot melt portion 17 is melted.
- the first active material layer 12 is in contact with, for example, the first current collector 11.
- the first active material layer 12 contains, for example, a positive electrode active material. That is, the first active material layer 12 is, for example, a positive electrode active material layer.
- the positive electrode active material is a substance in which metal ions such as lithium (Li) ions and magnesium (Mg) ions are inserted or removed from the crystal structure at a higher potential than that of the negative electrode, and oxidation or reduction is performed accordingly.
- the positive electrode active material is a substance in which lithium (Li) ions are inserted or removed, and oxidation or reduction is performed accordingly.
- the positive electrode active material is, for example, a compound containing lithium and a transition metal element.
- the compound is, for example, an oxide containing lithium and a transition metal element, or a phosphoric acid compound containing lithium and a transition metal element.
- oxides containing lithium and transition metal elements are LiNi x M 1-x O 2 (where M is Co, Al, Mn, V, Cr, Mg, Ca, Ti, Zr, Nb, Mo). , And at least one selected from the group consisting of W, such as lithium nickel composite oxides such as 0 ⁇ x ⁇ 1), lithium cobalt oxide (LiCoO 2 ), and lithium nickel oxide (LiNiO 2 ). ), Or a lithium manganate with a spinel structure (eg, LiMn 2 O 4 , Li 2 MnO 3 , or LiMn O 2 ).
- An example of a phosphoric acid compound containing lithium and a transition metal element is lithium iron phosphate (LiFePO 4 ) having an olivine structure.
- Sulfides such as sulfur ( S) and lithium sulfide (Li 2S) may be used as the positive electrode active material.
- lithium niobate (LiNbO 3 ) or the like may be coated or added to the positive electrode active material particles.
- the positive electrode active material only one of these materials may be used, or two or more of these materials may be used in combination.
- the first active material layer 12 may contain a material other than the positive electrode active material in addition to the positive electrode active material. That is, the first active material layer 12 may be a mixture layer. Examples of such materials are inorganic solid electrolytes, solid electrolytes such as sulfide solid electrolytes, conductive auxiliary materials such as acetylene black, or binding binders such as polyethylene oxide and polyvinylidene fluoride.
- the first active material layer 12 may have a thickness of, for example, 5 ⁇ m or more and 300 ⁇ m or less.
- the second active material layer 14 is in contact with, for example, the second current collector 15.
- the second active material layer 14 contains, for example, a negative electrode active material. That is, the second active material layer 14 is, for example, a negative electrode active material layer.
- the negative electrode active material is a substance in which metal ions such as lithium (Li) ions and magnesium (Mg) ions are inserted or removed from the crystal structure at a lower potential than that of the positive electrode, and oxidation or reduction is performed accordingly.
- the negative electrode active material is a substance in which lithium (Li) ions are inserted or removed, and oxidation or reduction is performed accordingly.
- the negative electrode active material are carbon materials such as natural graphite, artificial graphite, graphite carbon fiber, and resin calcined carbon, or alloy-based materials that are compounded with a solid electrolyte.
- alloy-based materials include LiAl, LiZn, Li 3 Bi, Li 3 Cd, Li 3 Sb, Li 4 Si, Li 4.4 Pb, Li 4.4 Sn, Li 0.17 C, and Lithium alloys such as Li C 6 , titanium acid. It is an oxide of lithium and a transition metal element such as lithium (Li 4 Ti 5 O 12 ), or a metal oxide such as zinc oxide (ZnO) or silicon oxide (SiO x ).
- the negative electrode active material only one of these materials may be used, or two or more of these materials may be used in combination.
- the second active material layer 14 may contain a material other than the negative electrode active material in addition to the negative electrode active material.
- materials are inorganic solid electrolytes, solid electrolytes such as sulfide solid electrolytes, conductive auxiliary materials such as acetylene black, or binding binders such as polyethylene oxide and polyvinylidene fluoride.
- the second active material layer 14 may have a thickness of, for example, 5 ⁇ m or more and 300 ⁇ m or less.
- the first current collector 11, the first active material layer 12, the solid electrolyte layer 13, the second active material layer 14, and the second current collector 15 are, for example, in shape, position, and size in a plan view. Are the same as each other.
- the solid electrolyte layer 13 is in contact with, for example, the first active material layer 12 and the second active material layer 14.
- the solid electrolyte layer 13 contains a solid electrolyte.
- the solid electrolyte layer 13 contains, for example, a solid electrolyte as a main component.
- the main component is the component contained most in the solid electrolyte layer 13 in terms of mass ratio.
- the solid electrolyte layer 13 may be composed of only the solid electrolyte.
- the solid electrolyte may be a known solid electrolyte for batteries having ionic conductivity.
- As the solid electrolyte for example, a solid electrolyte that conducts metal ions such as lithium ion and magnesium ion can be used.
- an inorganic solid electrolyte such as a sulfide-based solid electrolyte and an oxide-based solid electrolyte can be used.
- the sulfide-based solid electrolyte is, for example, a lithium-containing sulfide.
- lithium-containing sulfides are Li 2 SP 2 S 5 series, Li 2 S-SiS 2 series, Li 2 SB 2 S 3 series, Li 2 S-GeS 2 series, Li 2 S-SiS 2 -Li I series, Li 2 S-SiS 2 -Li 3 PO 4 series, Li 2 S-Ge 2 S 2 series, Li 2 S-GeS 2 -P 2 S 5 series, or Li 2 S-GeS 2 -ZnS series Is.
- the oxide-based solid electrolyte is, for example, a lithium-containing metal oxide, a lithium-containing metal nitride, lithium phosphate (Li 3 PO 4 ), or a lithium-containing transition metal oxide.
- lithium-containing metal oxides are Li 2 O-SiO 2 or Li 2 O-SiO 2 -P 2 O 5 .
- An example of a lithium-containing metal nitride is Li x P y O 1-z N z .
- An example of a lithium-containing transition metal oxide is lithium titanium oxide.
- solid electrolyte only one of these materials may be used, or two or more of these materials may be used in combination.
- the solid electrolyte layer 13 may contain a binder such as polyethylene oxide and polyvinylidene fluoride in addition to the above solid electrolyte.
- the solid electrolyte layer 13 may have a thickness of, for example, 5 ⁇ m or more and 150 ⁇ m or less.
- the material of the solid electrolyte may be composed of agglomerates of particles.
- the material of the solid electrolyte may be composed of a sintered structure.
- the joint portion 16 and the hot melt portion 17 have the same shape, position, and width in a plan view, but are not limited thereto. It is sufficient that the strength and electrical resistance of the joint satisfy the practicality.
- the joint portion 16 and the heat melting portion 17 may be circular or elliptical.
- the joint portion 16 may have a shape different from that of the hot melt portion 17.
- the battery 1100 has high reliability capable of suppressing heat generation and overcurrent.
- the first current collector 11 and the lead terminal 18 are joined by a joining portion 16 containing a conductive resin material, and the lead terminal 18 and the connecting portion 16 are joined to each other.
- a hot melting section 17 containing a solder material is provided.
- This configuration of the battery 1100 is different from the battery configuration disclosed in Patent Document 1 and Patent Document 2.
- the battery configurations disclosed in Patent Document 1 and Patent Document 2 and the problems they have are as described above.
- the lead terminal 18 provided with the heat melting portion 17 is joined to the first current collector 11 by the joining portion 16 containing the conductive resin material without giving a thermal shock. ing. Therefore, it is clear that the battery 1100 according to the present embodiment does not have the problems of cracks and responsiveness due to thermal shock, which are the problems of the batteries disclosed in Patent Documents 1 and 2. ..
- the first active material layer 12 is described as a positive electrode active material layer
- the second active material layer 14 is described as a negative electrode active material layer.
- a glass powder of Li 2 SP 2 S 5 sulfide having an average particle diameter of about 10 ⁇ m and containing a triclinic crystal as a main component is prepared. Will be done.
- glass powder having high ionic conductivity for example, 2 ⁇ 10 -3 S / cm to 3 ⁇ 10 -3 S / cm
- the positive electrode active material for example, a powder of a Li / Ni / Co / Al composite oxide (for example, LiNi 0.8 Co 0.15 Al 0.05 O 2 ) having an average particle size of about 5 ⁇ m and having a layered structure is used.
- a paste for a positive electrode active material layer is produced by dispersing a mixture containing the above-mentioned positive electrode active material and the above-mentioned glass powder in an organic solvent or the like.
- the negative electrode active material for example, natural graphite powder having an average particle diameter of about 10 ⁇ m is used.
- a paste for a negative electrode active material layer is produced by dispersing a mixture containing the above-mentioned negative electrode active material and the above-mentioned glass powder in an organic solvent or the like.
- the first current collector 11 and the second current collector 15 for example, a copper foil having a thickness of about 30 ⁇ m is prepared.
- the first current collector 11 is described as a positive current collector
- the second current collector 15 is described as a negative electrode current collector.
- the paste for the positive electrode active material layer and the paste for the negative electrode active material layer are printed on one surface of each copper foil so as to have a predetermined shape and a thickness of about 50 ⁇ m to 100 ⁇ m, respectively. ..
- the positive electrode active material layer paste and the negative electrode active material layer paste are dried at 80 ° C. to 130 ° C. to a thickness of 30 ⁇ m to 60 ⁇ m.
- a current collector for example, copper foil
- the first active material layer 12 for example, the positive electrode active material layer
- the second active material layer 14 for example, the negative electrode active material layer
- a paste for a solid electrolyte layer is prepared by dispersing the above-mentioned mixture containing the glass powder in an organic solvent or the like.
- the above-mentioned paste for the solid electrolyte layer is printed on the surfaces of the first active material layer 12 and the second active material layer 14 using a metal mask so as to have a thickness of, for example, about 100 ⁇ m.
- the solid electrolyte layer paste is then dried at 80 ° C to 130 ° C.
- the solid electrolyte layer printed on the first active material layer 12 and the solid electrolyte layer printed on the second active material layer 14 are laminated so as to be in contact with each other and face each other.
- an elastic sheet (thickness of 70 ⁇ m) having an elastic modulus of about 5 ⁇ 10 6 Pa having a size divided into three in the longitudinal direction is inserted into the upper surface of the current collector between the pressure die plate and the current collector.
- a heat-curable conductor resin paste containing silver particles having an average particle diameter of 0.5 ⁇ m, which is a joint portion 16, is printed on the surface of the first current collector 11 with a metal mask to a thickness of about 20 ⁇ m.
- the lead terminal 18 whose surface is solder-plated in advance is set in the joint portion 16, placed in a dryer so as not to move, and heated to, for example, 120 ° C. in 30 minutes, and then heat-cured for 1 hour. And cool to room temperature.
- the battery 1100 can be obtained.
- the battery 1100 according to the present embodiment is provided with a lead terminal mechanism by suppressing thermal shock and thermal stress because soldering is not directly performed on the battery element 10 on which the current collector is formed in the manufacturing process. Can be done.
- the method and order of forming the battery 1100 is not limited to the above example.
- a paste for a positive electrode active material layer for example, a paste for a negative electrode active material layer, a paste for a solid electrolyte layer, and a conductor paste by printing is shown, but the present invention is not limited to this.
- the printing method for example, a doctor blade method, a calendar method, a spin coating method, a dip coating method, an inkjet method, an offset method, a die coating method, a spray method and the like can be used.
- thermosetting conductor paste containing silver metal particles is shown as an example of the conductor resin paste, but the present invention is not limited to this.
- the metal component of the conductor paste for example, silver, copper, nickel, zinc, aluminum, palladium, gold, platinum or an alloy obtained by combining these metals can be used.
- the shape of the metal particles may be any shape such as spherical, flaky, needle-shaped and the like. For example, the smaller the particle size, the lower the temperature at which the alloy reaction and diffusion proceed. Therefore, the particle size and shape of the metal particles are appropriately selected in consideration of the influence of the thermal history on the process design and the battery characteristics.
- the resin used for the thermosetting conductor resin paste may be any resin as long as it functions as a binder for binding, and an appropriate resin is selected depending on the manufacturing process to be adopted, such as printability and coatability.
- the resin used for the thermosetting conductor paste includes, for example, a thermosetting resin.
- An example of thermosetting resin is (I) Amino resins such as urea resin, melamine resin, and guanamine resin, (Ii) Epoxy resins such as bisphenol A type, bisphenol F type, phenol novolac type, alicyclic type, etc.
- Oxetane resin (Iii) Oxetane resin, (Iv) a phenol resin such as a resole type or a novolak type, or (v) a silicone-modified organic resin such as a silicone epoxy or a silicone polyester. Only one of these materials may be used for the resin, or two or more of these materials may be used in combination.
- the battery according to the second embodiment is a modification of the battery according to the first embodiment.
- the matters described in the first embodiment may be omitted.
- FIG. 2 is a diagram showing a schematic configuration of the battery 1200 according to the second embodiment.
- FIG. 2A is a cross-sectional view of the battery 1200 according to the second embodiment.
- FIG. 2B is a plan view of the battery 1200 as viewed from below in the z-axis direction.
- FIG. 2 (a) shows a cross section at the position indicated by the line II-II of FIG. 2 (b).
- the lead terminal 20 is partially plated with a solder material. That is, in the battery 1200, the hot melting portion 19 is formed by the plating film of the solder material. The hot melting portion 19 partially covers the surface of the lead terminal 20. The hot melt portion 19 has a larger area than the joint portion 16. In addition to the joint surface, the lead terminal 20 is also covered with a heat melting portion 19 on its side surface.
- the battery 1200 has high reliability that can suppress heat generation and overcurrent.
- the battery according to the third embodiment is a modification of the battery according to the first embodiment.
- the matters described in the first embodiment may be omitted.
- FIG. 3 is an enlarged cross-sectional view of the periphery of the joint portion in the battery 1300 according to the third embodiment.
- the shape of the cross section of the lead terminal 21 is trapezoidal.
- the lead terminal 21 is partially plated with a solder material, similar to the lead terminal 20 of the battery 1200 according to the second embodiment.
- the hot melting portion 21 is formed by the plating film of the solder material.
- the surface corresponding to the shorter bottom of the trapezoid in the cross section is joined to the joining portion 16 via the heat melting portion 22.
- FIG. 4 is an enlarged cross-sectional view of the periphery of the joint portion in the battery 1300A, which is a modification of the battery 1300 according to the third embodiment.
- the cross section of the lead terminal 21 may be triangular.
- the lead terminal 21 is arranged so that the surface including the apex of the triangle in the cross section faces the first current collector 11. That is, in this case, for example, in the lead terminal 21, the surface including the apex of the triangle in the cross section is joined to the joining portion 16 via the hot melting portion 22.
- the battery 1300 has high reliability capable of suppressing heat generation and overcurrent.
- the battery according to the fourth embodiment is a modification of the battery according to the first embodiment.
- the matters described in the first embodiment may be omitted.
- FIG. 5 is an enlarged cross-sectional view of the periphery of the joint portion in the battery 1400 according to the fourth embodiment.
- the shape of the joint surface of the lead terminal 23 is uneven. Therefore, in the battery 1400, the lead terminal 23 is joined to the joining portion 16 via the heat melting portion 24 on the surface having the uneven structure.
- the uneven structure in FIG. 5 is an example, and the uneven structure may have a ⁇ shape.
- the joining area between the lead terminal 23 and the joining portion 16 is increased, so that the connection resistance between the lead terminal 23 and the joining portion 16 is reduced.
- the influence on the battery characteristics due to the provision of the joint portion 16 and the heat melting portion 24 can be reduced, and the connection strength can be further improved.
- the battery according to the fifth embodiment is a modification of the battery according to the first embodiment.
- the matters described in the first embodiment may be omitted.
- FIG. 6 is an enlarged cross-sectional view of the periphery of the joint portion in the battery 1500 according to the fifth embodiment.
- the lead terminal 25 is covered with the first solder material 26 and the second solder material 27. That is, the lead terminal 25 is covered with two kinds of solder materials.
- the first solder material 26 is in contact with the joint surface of the lead terminal 25.
- the second solder material 27 is in contact with the side surface of the lead terminal 25.
- the second solder material 27 has a lower melting point than the first solder material 26.
- the lead terminal 25 can be easily separated from the joint body 16. Further, the temperature accuracy and responsiveness in which the lead terminal 25 is separated from the joint portion 16 due to heat generation are improved.
- the electric device of the present disclosure can be used, for example, as a secondary battery used in various electronic devices, automobiles, and the like.
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Abstract
Description
集電体を備えた電気素子、
前記集電体に電気的に接続されたリード端子、
導電性樹脂材料を含有し、かつ前記集電体と前記リード端子とを接合する接合部、および
前記接合部と前記リード端子との間に位置し、かつ半田材料を含有する熱溶融部、
を備える。
[背景技術]の欄に記載したとおり、特許文献1および2には、電池温度の上昇を抑制する技術が用いられた電池が開示されている。
以下、本開示の実施形態が図面を参照しながら具体的に説明される。
第1実施形態による電気デバイスについて説明する。
(i)尿素樹脂、メラミン樹脂、グアナミン樹脂等のアミノ樹脂、
(ii)ビスフェノールA型、ビスフェノールF型、フェノールノボラック型、脂環式等のエポキシ樹脂、
(iii)オキセタン樹脂、
(iv)レゾール型、ノボラック型等のフェノール樹脂、または
(v)シリコーンエポキシ、シリコーンポリエステル等のシリコーン変性有機樹脂
である。樹脂には、これらの材料の1種のみが用いられてもよいし、これらの材料のうちの2種以上が組み合わされて用いられてもよい。
(i)尿素樹脂、メラミン樹脂、グアナミン樹脂等のアミノ樹脂、
(ii)ビスフェノールA型、ビスフェノールF型、フェノールノボラック型、脂環式等のエポキシ樹脂、
(iii)オキセタン樹脂、
(iv)レゾール型、ノボラック型等のフェノール樹脂、または
(v)シリコーンエポキシ、シリコーンポリエステル等のシリコーン変性有機樹脂
である。樹脂には、これらの材料の1種のみが用いられてもよいし、これらの材料のうちの2種以上が組み合わされて用いられてもよい。
以下、第2実施形態による電池が説明される。第2実施形態による電池は、第1実施形態による電池の変形例である。第1実施形態で説明された事項は、省略され得る。
以下、第3実施形態による電池が説明される。第3実施形態による電池は、第1実施形態による電池の変形例である。第1実施形態で説明された事項は、省略され得る。
以下、第4実施形態による電池が説明される。第4実施形態による電池は、第1実施形態による電池の変形例である。第1実施形態で説明された事項は、省略され得る。
以下、第5実施形態による電池が説明される。第5実施形態による電池は、第1実施形態による電池の変形例である。第1実施形態で説明された事項は、省略され得る。
Claims (18)
- 集電体を備えた電気素子、
前記集電体に電気的に接続されたリード端子、
導電性樹脂材料を含有し、かつ前記集電体と前記リード端子とを接合する接合部、および
前記接合部と前記リード端子との間に位置し、かつ半田材料を含有する熱溶融部、
を備えた電気デバイス。 - 前記半田材料の融点は、150℃未満である、
請求項1に記載の電気デバイス。 - 前記半田材料は、SnおよびBiを含有する、
請求項1または2に記載の電気デバイス。 - 前記半田材料は、SnおよびInを含有する、
請求項1または2に記載の電気デバイス。 - 前記熱溶融部は、前記リード端子に接している、
請求項1から4のいずれか一項に記載の電気デバイス。 - 前記熱溶融部は、前記リード端子の表面全体を覆っている、
請求項1から5のいずれか一項に記載の電気デバイス。 - 前記熱溶融部は、メッキ膜である、
請求項1から6のいずれか一項に記載の電気デバイス。 - 前記接合部は、前記集電体および前記熱溶融部に接している、
請求項1から7のいずれか一項に記載の電気デバイス。 - 前記接合部は、前記リード端子における前記集電体と対向する面の反対面には形成されていない、
請求項1から8のいずれか一項に記載の電気デバイス。 - 前記リード端子は、前記集電体に対向する接合面と、当該接合面に対する側面とを含み、
前記熱溶融部は、前記接合面および前記側面に接している、
請求項1から9のいずれか一項に記載の電気デバイス。 - 前記半田材料は、第1半田材料および第2半田材料を含み、
前記第1半田材料は、前記接合面に接し、
前記第2半田材料は、前記側面に接し、
前記第2半田材料は、前記第1半田材料よりも低い融点を有する、
請求項10に記載の電気デバイス。 - 前記導電性樹脂材料の硬化温度は、前記半田材料の融点よりも低い、
請求項1から11のいずれか一項に記載の電気デバイス。 - 前記導電性樹脂材料は、熱硬化性導電性樹脂材料であり、かつ、銀および銅からなる群より選択される少なくとも1つを含有する、
請求項1から12のいずれか一項に記載の電気デバイス。 - 前記リード端子は、前記リード端子の前記集電体に対向する接合面において、凹凸構造を有する、
請求項1から13のいずれか一項に記載の電気デバイス。 - 前記リード端子の断面の形状は、台形であり、
前記リード端子において、前記台形の短い方の底辺に相当する面は、前記熱溶融部を介して前記接合部に接合されている、
請求項1から14のいずれか一項に記載の電気デバイス。 - 前記リード端子の断面の形状は、三角形であり、
前記リード端子において、前記三角形の頂点を含む面は、前記熱溶融部を介して前記接合部に接合されている、
請求項1から14のいずれか一項に記載の電気デバイス。 - 前記リード端子は、屈曲している、
請求項1から16のいずれか一項に記載の電気デバイス。 - 前記集電体は、正極集電体であり、
前記リード端子は、前記正極集電体に電気的に接続されている、
請求項1から17のいずれか一項に記載の電気デバイス。
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Citations (6)
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JPS6386252A (ja) * | 1986-09-29 | 1988-04-16 | Shin Kobe Electric Mach Co Ltd | 鉛蓄電池の製造法 |
JPH04286859A (ja) * | 1991-03-15 | 1992-10-12 | Murata Mfg Co Ltd | 偏平型電源素子 |
JPH06196151A (ja) * | 1992-12-10 | 1994-07-15 | Japan Storage Battery Co Ltd | 密閉型蓄電池の製造方法 |
JPH104002A (ja) * | 1996-06-17 | 1998-01-06 | Otsuka Chem Co Ltd | 電気回路保護用ptc抵抗素子 |
JP2001043846A (ja) * | 1999-07-29 | 2001-02-16 | Uchihashi Estec Co Ltd | 温度ヒュ−ズ付き二次電池及びシ−ト状温度ヒュ−ズ |
JP2001313202A (ja) * | 2000-04-28 | 2001-11-09 | Nec Schott Components Corp | 保護装置 |
-
2021
- 2021-10-26 JP JP2022572925A patent/JPWO2022145125A1/ja active Pending
- 2021-10-26 CN CN202180086146.0A patent/CN116635965A/zh active Pending
- 2021-10-26 WO PCT/JP2021/039562 patent/WO2022145125A1/ja active Application Filing
-
2023
- 2023-06-13 US US18/209,278 patent/US20230327232A1/en active Pending
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
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JPS6386252A (ja) * | 1986-09-29 | 1988-04-16 | Shin Kobe Electric Mach Co Ltd | 鉛蓄電池の製造法 |
JPH04286859A (ja) * | 1991-03-15 | 1992-10-12 | Murata Mfg Co Ltd | 偏平型電源素子 |
JPH06196151A (ja) * | 1992-12-10 | 1994-07-15 | Japan Storage Battery Co Ltd | 密閉型蓄電池の製造方法 |
JPH104002A (ja) * | 1996-06-17 | 1998-01-06 | Otsuka Chem Co Ltd | 電気回路保護用ptc抵抗素子 |
JP2001043846A (ja) * | 1999-07-29 | 2001-02-16 | Uchihashi Estec Co Ltd | 温度ヒュ−ズ付き二次電池及びシ−ト状温度ヒュ−ズ |
JP2001313202A (ja) * | 2000-04-28 | 2001-11-09 | Nec Schott Components Corp | 保護装置 |
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US20230327232A1 (en) | 2023-10-12 |
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