WO2006004143A1 - ニッケル水素蓄電池 - Google Patents
ニッケル水素蓄電池 Download PDFInfo
- Publication number
- WO2006004143A1 WO2006004143A1 PCT/JP2005/012443 JP2005012443W WO2006004143A1 WO 2006004143 A1 WO2006004143 A1 WO 2006004143A1 JP 2005012443 W JP2005012443 W JP 2005012443W WO 2006004143 A1 WO2006004143 A1 WO 2006004143A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- case
- hydrogen
- storage battery
- valve
- valve member
- Prior art date
Links
- 239000001257 hydrogen Substances 0.000 title claims abstract description 170
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 170
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 233
- 239000007789 gas Substances 0.000 claims abstract description 55
- 238000007599 discharging Methods 0.000 claims abstract 3
- 229910052987 metal hydride Inorganic materials 0.000 claims description 79
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 75
- 229910052759 nickel Inorganic materials 0.000 claims description 53
- 238000007789 sealing Methods 0.000 claims description 41
- -1 nickel metal hydride Chemical class 0.000 claims description 38
- 230000002093 peripheral effect Effects 0.000 claims description 35
- 239000002184 metal Substances 0.000 claims description 26
- 229910052751 metal Inorganic materials 0.000 claims description 26
- 238000005452 bending Methods 0.000 claims description 10
- 238000004891 communication Methods 0.000 claims description 9
- 229910000652 nickel hydride Inorganic materials 0.000 claims description 7
- 238000012354 overpressurization Methods 0.000 claims description 4
- 230000002265 prevention Effects 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 239000003792 electrolyte Substances 0.000 abstract description 5
- 229920001971 elastomer Polymers 0.000 description 20
- 230000007423 decrease Effects 0.000 description 11
- 230000035699 permeability Effects 0.000 description 11
- 229910045601 alloy Inorganic materials 0.000 description 9
- 239000000956 alloy Substances 0.000 description 9
- 229910000831 Steel Inorganic materials 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
- 230000007797 corrosion Effects 0.000 description 5
- 238000005260 corrosion Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 239000012466 permeate Substances 0.000 description 5
- 229920002943 EPDM rubber Polymers 0.000 description 4
- 239000000470 constituent Substances 0.000 description 4
- 238000003825 pressing Methods 0.000 description 4
- 239000002585 base Substances 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 3
- 239000008151 electrolyte solution Substances 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000011149 active material Substances 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 2
- 230000005489 elastic deformation Effects 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- BFDHFSHZJLFAMC-UHFFFAOYSA-L nickel(ii) hydroxide Chemical compound [OH-].[OH-].[Ni+2] BFDHFSHZJLFAMC-UHFFFAOYSA-L 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- 238000005549 size reduction Methods 0.000 description 1
- 239000012209 synthetic fiber Substances 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/34—Gastight accumulators
- H01M10/345—Gastight metal hydride accumulators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/116—Primary casings; Jackets or wrappings characterised by the material
- H01M50/117—Inorganic material
- H01M50/119—Metals
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/30—Arrangements for facilitating escape of gases
- H01M50/317—Re-sealable arrangements
- H01M50/325—Re-sealable arrangements comprising deformable valve members, e.g. elastic or flexible valve members
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/30—Arrangements for facilitating escape of gases
- H01M50/317—Re-sealable arrangements
- H01M50/325—Re-sealable arrangements comprising deformable valve members, e.g. elastic or flexible valve members
- H01M50/333—Spring-loaded vent valves
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/30—Arrangements for facilitating escape of gases
- H01M50/394—Gas-pervious parts or elements
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Definitions
- the present invention relates to a nickel metal hydride storage battery.
- Patent Document 1 JP-A-8-1 4 8 1 3 5
- Patent Document 2 JP-A-5-3 2 5 9 30
- the capacity of the negative electrode is larger than the capacity of the positive electrode.
- the discharge capacity of the battery is limited by the capacity of the positive electrode (hereinafter also referred to as positive electrode regulation).
- positive electrode regulation by using positive electrode regulation, it is possible to suppress an increase in internal pressure during overcharge and overdischarge.
- the excessive negative electrode capacity that can be charged is called charge reserve, and the excessive negative electrode capacity that can be discharged is called discharge reserve. Disclosure of the invention
- the hydrogen storage alloy of the negative electrode corrodes with use, and hydrogen is stored in the hydrogen storage alloy as a side reaction.
- the hydrogen storage capacity of hydrogen storage alloys gradually increases.
- the discharge reserve of the negative electrode increases, while the charge reserve decreases, and the internal pressure of the battery tends to increase during charging.
- the discharge reserve increases, the battery capacity decreases, so when used in hybrid vehicles, etc. There is a risk of problems. .
- the charge reserve disappears.As a result, the internal pressure of the battery becomes excessively high due to a large amount of hydrogen gas generated from the negative electrode when fully charged, and the safety valve opens. End up. As a result, the hydrogen gas in the battery can be discharged to the outside to suppress over-pressurization. However, since the electrolyte is discharged together with the hydrogen gas, the battery characteristics are significantly deteriorated due to the decrease in the electrolyte. End up. As described above, the nickel-metal hydride storage battery with a metal case has a problem that the battery characteristics deteriorate due to the long-term corrosion of the hydrogen storage alloy. In particular, when used as a power source for electric vehicles, hybrid vehicles, etc., a lifespan of 10 years or more is required, and the above-described deterioration in battery characteristics is a serious problem.
- the present invention has been made in view of the present situation, and an object of the present invention is to provide a nickel-metal hydride storage battery that can suppress an increase in the discharge reserve of the negative electrode and suppress a decrease in battery characteristics.
- a nickel metal hydride storage battery comprising: a safety valve device having a function of preventing over-pressurization to prevent, wherein the case has a gas discharge hole that passes through the case itself and communicates the inside and the outside of the case,
- the safety valve device includes a valve member that seals the gas discharge hole and includes a wall portion that forms a valve inner space that communicates with the gas discharge hole.
- the case This is a nickel hydrogen storage battery having a hydrogen leakage function that allows hydrogen gas in the case to leak out of the battery through the valve space even when the internal pressure of the battery is below the predetermined value.
- the safety valve device is a valve member that seals the gas discharge hole, and includes a valve member that includes a wall portion that forms a valve inner space communicating with the gas discharge hole. For this reason, hydrogen gas in the case can be introduced into the valve space through the gas discharge hole. As a result, a valve member without a valve inner space (for example, a solid cylindrical valve member) As compared with the case of using, the contact area between the hydrogen gas introduced into the valve inner space and the valve member (specifically, the wall portion forming the valve inner space of the valve member) can be increased.
- this safety valve device has a hydrogen leakage function that allows hydrogen gas in the case to leak out of the battery through the valve space even when the internal pressure of the case is below the predetermined value. Therefore, even when the inside of the case is not over-pressurized, the hydrogen gas in the case can be leaked to the outside through the valve space of the valve member having a large contact area with the hydrogen gas. For this reason, compared with the case of using a valve member without a valve inner space (for example, a solid cylindrical valve member), the hydrogen gas in the case is easily leaked to the outside, and an appropriate amount of hydrogen leakage is ensured. be able to.
- a safety valve device for example, using a valve member having a convex shape protruding outward from the case and having a convex wall portion forming the valve inner space, hydrogen gas introduced from the case into the valve inner space is used.
- An example is a safety valve device that allows a convex wall portion of a valve member forming a valve inner space to pass through and leaks out of the battery.
- a large hydrogen permeation area can be secured.
- the amount of hydrogen permeating through the valve member can be increased, so that the hydrogen gas in the case can be easily leaked to the outside. Therefore, it is possible to secure an appropriate amount of hydrogen leakage.
- valve member specifically, the wall portion forming the valve inner space
- the valve member is configured by a plurality of members (for example, a valve member that is formed into an annular shape or a cylindrical shape by insert molding, and is integrally formed of a metal member and a rubber member. ), And a safety valve device that leaks hydrogen gas to the outside through the constituent members forming the space in the valve (for example, between the metal member and the rubber member).
- the hydrogen gas introduced into the internal space of the valve can be appropriately leaked outside through the space between the constituent members.
- the amount of hydrogen gas that leaks to the outside through the components can be adjusted by adjusting the combination of the components that make up the valve interior, the selection of materials, and the number of components. Can be secured.
- the nickel-metal hydride storage battery of the present invention an appropriate amount of hydrogen leakage can be secured in the safety valve device even when the case does not reach an excessive pressure increase.
- the increase of hydrogen in the battery due to corrosion of the electrode hydrogen storage alloy can be appropriately suppressed. Therefore, it is possible to suppress an increase in the discharge reserve of the negative electrode and to suppress a decrease in battery characteristics.
- hydrogen permeable rubber may be used as the valve member.
- a hydrogen-permeable resin for example, EPDM
- EPDM hydrogen-permeable resin having high alkali resistance
- the nickel metal hydride storage battery of the present invention may be one in which hydrogen gas leaks from other parts (for example, a case).
- hydrogen gas in the case can be leaked out of the battery from parts other than the safety valve device and the safety valve device.
- the battery main body is disposed in the case in order to perform the battery function, and includes, for example, an electrode, a separator, an electrolytic solution, and the like.
- the said case is good in it being a nickel hydride storage battery made from metal.
- the case is made of metal. For this reason, the coolability of the battery becomes extremely good, and the excessive temperature rise of the battery can be prevented.
- the safety valve device has a hydrogen leakage function. Therefore, even in the metal case, the increase in the discharge reserve of the negative electrode is suppressed, and the battery characteristics are reduced. Can be suppressed.
- the wall portion that forms the inner space of the valve member includes a hydrogen permeable portion that leaks hydrogen gas in the inner space of the valve to the outside by permeation of hydrogen.
- the nickel-metal hydride storage battery is preferable.
- the hydrogen permeation part of the valve member (permeate hydrogen gas)
- the hydrogen gas in the valve space can be leaked to the outside appropriately.
- the hydrogen permeation part may be the entire wall part forming the valve inner space (for example, the entire convex wall part forming the valve inner space with a convex shape protruding outward from the case), or a part thereof It's okay.
- the hydrogen permeable portion of the valve member increases an inner contact area in contact with the valve inner space and an outer contact area in contact with the outside air by at least one of bending and bending.
- a nickel-metal hydride storage battery including an area increasing portion to be formed is preferable.
- the hydrogen permeation portion of the valve member portion through which hydrogen gas permeates
- the inner contact area in contact with the valve inner space and the outer contact area in contact with the outside air are increased by at least one of bending and disk bending.
- the area increasing part to be included is included.
- the inner contact area and the outer contact area are compared to the case where the hydrogen permeation part is not bent or bent (for example, a hydrogen permeation part having a flat plate shape or a bottomed cylindrical shape). Large area) can be secured.
- the amount of hydrogen permeating through the valve member can be further increased, so that the hydrogen gas in the case can be more easily leaked to the outside. Accordingly, since an appropriate amount of hydrogen leakage can be secured in the safety valve device, an increase in hydrogen in the battery can be appropriately suppressed.
- the hydrogen permeable portion of the valve member is a nickel-metal hydride storage battery including a thin-walled portion that is thinner than the surroundings.
- the hydrogen permeable portion (portion through which hydrogen gas permeates) of the valve member includes a thin portion that is thinner than the surroundings. For this reason, compared with the case where the convex wall portion is configured with a constant thickness without providing the thin wall portion, the amount of hydrogen permeating through the valve member is increased by the amount of hydrogen permeation from the thin wall portion. As a result, the hydrogen gas in the case can be more easily leaked to the outside.
- the valve member includes a seal portion that is in close contact with a hole surrounding portion located around the gas discharge hole in the case
- the safety valve device includes the above
- the seal part of the valve member is pressed toward the hole peripheral part of the case, and the seal surface of the seal part is surrounded by the elasticity of the seal part itself.
- a holding member that keeps the seal portion protruding outward from the case at a predetermined height, and the seal portion has an internal pressure in the case that exceeds the predetermined value.
- nickel hydride having a form in which a communication passage communicating the gas discharge hole and the outside appears between the seal surface and the peripheral portion of the hole by elastic deformation of at least a part of the seal portion.
- a storage battery is recommended.
- the sealing portion of the valve member is pressed against the hole peripheral portion of the case by the holding member, thereby bringing the seal surface of the seal portion into close contact with the peripheral portion of the hole. Furthermore, when the internal pressure in the case exceeds a predetermined value, there is a communication path that connects the gas discharge hole and the outside between the seal part and the hole peripheral part due to elastic deformation of at least a part of the seal part. Appear. As a result, when the internal pressure of the case is lower than a predetermined value, the seal surface of the valve member can be brought into close contact with the periphery of the hole so that the gas in the case is not discharged to the outside. On the other hand, when the internal pressure of the case exceeds a predetermined value, the gas in the case is discharged through the communication path that appears when at least a part of the seal portion is elastically deformed. Over-boosting can be prevented.
- the holding force that keeps the projecting height of the seal part outside the case at a predetermined height is also used to press the seal part, and the elasticity of the seal part itself brings the seal surface into close contact with the periphery of the hole. Yes.
- the number of parts can be reduced and the safety valve device can be reduced in size (especially from the case surface) compared to a configuration in which an elastic member such as a coil spring is used to press the seal surface of the seal portion toward the hole periphery. Can be reduced).
- valve member is a rubber molded body.
- the battery of the present invention is a nickel metal hydride storage battery, it is preferable to use a rubber molded body formed of rubber having high alkali resistance (such as NBR and EPDM).
- the valve member includes a seal portion that closely adheres to the periphery of the gas discharge hole in the case, and the wall portion that forms the inner space of the valve is It is preferable to use a nickel hydrogen storage battery that is a convex shape that protrudes outward from the seal portion and is a convex wall portion that forms the hydrogen permeable portion.
- the wall portion forming the inner space of the valve member has a convex shape protruding outward from the case from the seal portion, and is a convex wall portion forming the hydrogen permeable portion.
- the valve member of the safety valve device is a convex wall portion that protrudes from the seal portion and forms a space in the valve that communicates with the gas discharge hole.
- the convex wall part which leaks gas outside is included.
- the nickel-metal hydride storage battery includes an enclosing member that is in close contact with at least a part of the outer surface of the convex wall portion of the valve member, and surrounds the convex wall portion.
- a nickel-metal hydride storage battery having one or a plurality of through holes penetrating itself and exposing a part of the outer surface of the convex wall portion is preferable.
- the nickel metal hydride storage battery of the present invention includes an enclosing member that is in close contact with at least a part of the outer surface of the convex wall portion and surrounds the convex wall portion of the valve member. Thereby, deformation (expansion etc.) of the valve member can be prevented.
- the surrounding member has one or a plurality of through holes penetrating the surrounding member and exposing a part of the outer surface of the convex wall portion. For this reason, the hydrogen gas which permeate
- the leakage amount (leakage speed) of hydrogen gas can be adjusted by the number, size, position, and the like of the through holes of the surrounding member. Therefore, by adjusting the number, size, position, etc. of the through-holes in the surrounding material, it is possible to appropriately suppress the change (increase / decrease) in the discharge reserve of the negative electrode and appropriately suppress the deterioration of the battery characteristics. It becomes.
- the convex wall portion of the valve member and the surrounding member have a configuration in which a gap portion communicating with the through hole of the surrounding member is formed between the convex wall portion and the surrounding member. It is good that it is the nickel hydride storage battery formed.
- the convex wall portion of the valve member and the surrounding member are between the two.
- a gap portion communicating with the through hole of the surrounding member is formed.
- the wall portion that forms the space in the valve is a hydrogen permeable portion that leaks hydrogen gas in the space in the valve to the outside by permeation of hydrogen.
- the hydrogen permeable portion of the valve member includes an area increasing portion that increases an inner contact area in contact with the valve inner space and an outer contact area in contact with the outside air by at least one of bending and bending.
- the area increasing portion and the seal portion are compared with the height of the protrusion to the outside of the case as viewed from the periphery of the hole, or the area increasing portion is low, or the height of both is equal. It is good to use an Eckel hydrogen storage battery.
- the inner contact area and the outer contact area are compared with the case where the hydrogen permeation portion is not bent or bent (for example, flat shape). It can be secured greatly. As a result, the amount of hydrogen permeating through the valve member can be increased, so that the hydrogen gas in the case can be easily leaked to the outside. Accordingly, since an appropriate amount of hydrogen leakage can be secured in the safety valve device, an increase in hydrogen in the battery can be appropriately suppressed.
- the area increasing portion and the seal portion of the valve member are configured such that the area increasing portion is low or the height of both is equal compared to the protruding height of the case outward as viewed from the hole periphery.
- the area increasing portion is formed without making the shape of the valve member a convex shape protruding from the seal portion (without forming the convex wall portion).
- the wall portion forming the inner space of the valve member is composed of two or more members, and between the members, the members pass through the members.
- a nickel-hydrogen storage battery including an interface through which hydrogen gas in the space leaks outside is preferable.
- the hydrogen gas introduced into the valve space can be easily And appropriately, the hydrogen gas in the case can be leaked to the outside through the constituent members forming the space in the valve.
- a valve member specifically, a wall portion forming a valve inner space
- examples of such a valve member include an annular or tubular metal member and a rubber member that are integrally formed by insert molding.
- FIG. 1 is a partially broken perspective view of nickel hydrogen storage batteries 100 to 300 according to examples 1 to 3.
- FIG. 1 is a partially broken perspective view of nickel hydrogen storage batteries 100 to 300 according to examples 1 to 3.
- FIG. 2 is a longitudinal sectional view of the safety valve device 100 according to the first embodiment.
- FIG. 3 is a diagram showing a nickel metal hydride storage battery 200 of Example 2, and a safety valve device
- FIG. 2 is a longitudinal sectional view in the vicinity of 2 0 1.
- FIG. 4 is a top view of the valve member 2 10 according to the second embodiment.
- FIG. 5 is a longitudinal sectional view of the safety valve device 30 1 of the third embodiment.
- FIG. 6 is an exploded perspective view of the nickel hydrogen storage battery 600 according to the fourth embodiment.
- FIG. 7 is a top view of the valve member 6 10 according to the fourth embodiment.
- FIG. 8 is a front view of the valve member 6 10 according to the fourth embodiment.
- FIG. 9 is a view showing the valve member 6 10 according to the fourth embodiment, and corresponds to the BB sectional view of FIG.
- FIG. 10 is an explanatory view for explaining the safety valve device 60 1 according to the fourth embodiment, and corresponds to a cross-sectional view taken along line AA in FIG.
- FIG. 11 is a half sectional view in side view of a valve member 4 10 according to another embodiment.
- FIG. 12 is a view showing a valve member 4 10 according to another embodiment, and corresponds to a cross-sectional view taken along line AA in FIG.
- FIG. 13 is a half sectional view in side view of a valve member 5 10 according to another embodiment.
- FIG. 14 is a partially broken perspective view of the nickel-hydrogen storage battery 700 according to the fifth embodiment.
- FIG. 15 is a longitudinal sectional view (longitudinal sectional view in a direction orthogonal to FIG. 2) of the safety valve device 70 1 of Example 5, and corresponds to the hh sectional view of FIG.
- FIG. 16 is a longitudinal sectional view of the safety valve device 701 of Example 5 (corresponding to the HH sectional view of FIG. 14), and shows a state when the internal pressure in the case exceeds a predetermined value. is there.
- FIG. 17 is a perspective view of the valve member 710 according to the fifth embodiment.
- FIG. 18 is a longitudinal sectional view of the safety valve device 801 of the nickel metal hydride storage battery 800 according to the sixth embodiment.
- FIG. 19 is a perspective view of a valve member 910 according to another embodiment.
- FIG. 20 is a longitudinal sectional view of the safety valve device 1101 according to the seventh embodiment.
- FIG. 21 is a perspective view of the valve member 1 1 10 of the safety valve device 1101.
- FIG. 22 is a partially broken perspective view of the nickel-hydrogen storage battery 1000 according to the eighth embodiment.
- FIG. 23 is a perspective view of the valve member 1010 according to the eighth embodiment.
- FIG. 24 is a longitudinal sectional view (longitudinal sectional view in the same direction as FIG. 2) of the safety valve device 1001 of Example 8, which corresponds to the GG sectional view of FIG.
- FIG. 25 is a longitudinal sectional view of the safety valve device 1001 of Example 8 (corresponding to the GG sectional view of FIG. 22), and shows how the internal pressure in the case exceeds a predetermined value. It is.
- the nickel-metal hydride storage battery 100 of Example 1 was disposed in a case 102 having a sealing plate 120 and a battery case 130, a safety valve device 101, and a case 102 (battery case 130).
- This is a rectangular sealed nickel-metal hydride storage battery having an electrode plate group 1 50 and an electrolyte (not shown).
- the electrode plate group 150 includes a positive electrode 151, a negative electrode 152, and a bag-shaped separator 153. Of these, the positive electrode 151 is inserted into a bag-like separator 153, and The positive electrode 15 1 and the negative electrode 15 2 inserted in the palator 15 3 are alternately stacked. The positive electrode 1 5 1 and the negative electrode 1 5 2 are respectively collected and connected to a positive electrode terminal and a negative electrode terminal (not shown).
- the positive electrode capacity is 6.5 A h and the negative electrode capacity is 11.0 A h. Therefore, the nickel metal hydride storage batteries of the embodiments of the present invention (Examples 1 to 4) are all regulated by the positive electrode and have a battery capacity of 6.5 Ah.
- the positive electrode 15 for example, an electrode plate including an active material containing hydrated nickel hydroxide and an active material support such as foamed nickel can be used.
- the negative electrode 15 2 for example, an electrode plate containing a hydrogen storage alloy or the like as a negative electrode constituent material can be used.
- the separator 15 3 for example, a nonwoven fabric made of synthetic fiber subjected to hydrophilic treatment can be used.
- the electrolytic solution for example, an alkaline aqueous solution containing K 2 O H and having a specific gravity of 1.2 to 1.4 can be used.
- the battery case 1 30 is made of metal (specifically, a nickel-plated steel plate) and has a rectangular box shape.
- the sealing plate 120 is made of metal (specifically, a nickel-plated steel plate) and has a substantially rectangular plate shape. As shown in FIG. 2, the sealing plate 120 has a gas discharge hole 12 2 that communicates the inside of the case 10 2 with the outside. As shown in FIG. 2, the sealing plate 1 2 0 is placed on the opening end face 1 3 1 of the battery case 1 30 and welded all around, and the opening 1 3 2 of the battery case 1 3 0 is connected. It is sealed. As a result, the sealing plate 120 and the battery case 130 are integrated with no gap to form the case 1002. In Example 1, since the entire case 102 is made of metal (only the metal wall portion), the battery has extremely good cooling performance and can prevent the battery from overheating.
- the safety valve device 100 has a valve member 110, a surrounding member 170, a coil spring 160, a pedestal plate 180, and a safety valve case 140.
- the base plate 1 80 is made of metal (specifically, a nickel-plated steel plate) and has an annular plate shape and is fixed on the outer peripheral surface 1 2 7 of the sealing plate 1 20.
- the surrounding member 1 70 is made of a metal (specifically, a nickel-plated steel plate), and has a substantially annular flange portion 1 71, a cylindrical side wall portion 1 7 2, and a disk-shaped ceiling portion 1 7 4 and. Of these, side wall 1 A number of through holes 1 75 are formed in 72 and the ceiling portion 1 74.
- the valve member 1 10 is made of rubber (specifically, EPDM), and has a substantially annular flange portion 1 1 1 and a convex wall portion 1 18 (cylindrical shape) that protrudes from the flange portion 1 1 1. Side wall portion 1 12 and disc-shaped ceiling portion 1 14), and has a shape suitable for the inner peripheral surface 170 b of the surrounding member 170.
- the valve member 110 is inserted into the surrounding member 170 and disposed on the outer peripheral surface 127 of the sealing plate 120 at a position inside the base plate 180. In the first embodiment, the thickness of the valve member 110 is set to 0.5 mm.
- the safety valve case 140 is made of metal (specifically, a nickel-plated steel plate) and has a substantially cylindrical shape with a bottom.
- a through hole 144 b having a diameter larger than the outer diameter of the side wall portion 172 of the surrounding member 170 is formed in the ceiling portion 144 of the safety valve case 140.
- the safety valve case 140 is fixed on the pedestal plate 180.
- the coil spring 160 has a spiral shape whose diameter decreases as it proceeds downward in FIG.
- the coil panel 160 has a small-diameter end 161 mounted on the flange 170 of the surrounding member 170, and the large-diameter end 162 is pressed downward in FIG. 2 by the ceiling 144 of the safety valve case 140. In this way, it is arranged in the safety valve case 140 in a compressed and deformed state.
- such a safety valve device 101 discharges the gas (hydrogen gas or the like) in the case 102 to the outside and prevents the internal pressure of the case 102 from being excessively increased.
- the surrounding member 170 together with the valve member 110 is pressed upward by the gas in the case 102 and the coil panel is pressed by this pressing force. 160 is further compressed and deformed.
- the seal part 1 15 of the valve member 1 10 that has been in close contact with the hole peripheral part 121 of the sealing plate 120 is separated from the hole peripheral part 1 21, so that the gas in the case 102 flows outside the valve member 1 10. Then, it is discharged outside the battery through the through hole 1 4 4 b formed in the ceiling portion 1 4 4 of the safety valve case 1 4 0. In this way, it is possible to prevent the internal pressure of the case 102 from being excessively increased.
- the valve member 110 is formed of a thin rubber (EPDM) having hydrogen permeability.
- EPDM thin rubber
- the hydrogen gas in the case 102 is permeated through the valve member 110 from the space in the valve communicating with the gas discharge hole 1222, and the outside of the battery through the through hole 1775 in the enclosure member 170. Can be leaked.
- the safety valve device 1 0 1 in addition to the over-boosting prevention function that prevents the overpressure of the internal pressure of the case 10 0 2 from being released, gradually leaks the hydrogen gas in the case 1 0 2 to the outside of the battery. Also have.
- the hydrogen gas in the case 102 can be leaked to the outside of the battery through the safety valve device 101.
- the increase of hydrogen in the battery due to corrosion of the hydrogen storage alloy can be suppressed. Therefore, an increase in the discharge reserve of the negative electrode 15 2 can be suppressed, and a decrease in battery characteristics can be suppressed.
- valve member 1 1 0 has the flange 1
- Convex wall part 1 1 8 (cylindrical side wall part 1 1 2 and disk-like ceiling part 1 1) forming a convex shape (specifically, a bottomed cylindrical shape) protruding from 1 (seal part 1 1 5)
- a valve inner space C communicating with the gas discharge holes 1 2 2 is provided.
- a large contact area (hydrogen permeation area) between the hydrogen gas introduced from the case 102 into the valve space C and the valve member 110 can be secured.
- the amount of hydrogen permeating through the valve member 110 can be increased, so that the hydrogen gas in the case 102 can easily leak to the outside through the safety valve device 101.
- the nickel hydrogen storage battery 100 corresponds to a wall portion that forms the convex wall portion 1 118 force S and the valve space C, and also corresponds to a hydrogen permeable portion.
- Example 1 a large number of through holes 1 75 are formed in the surrounding member 1 70.
- a part of the outer surface 1 1 8 c of the convex wall portion 1 1 8 c of the valve member 1 1 0 is brought into close contact with the surrounding member 1 70, and the other part is passed through a number of penetrations of the surrounding member 1 70. Exposed from hole 1 7 5.
- a part of the outer surface 1 1 8 c of the convex wall 1 1 8 surrounds By bringing the material into close contact with the material 170, deformation (such as expansion) of the valve member 110 (convex wall portion 118) can be prevented.
- the amount of leakage of hydrogen gas (leakage) Speed) can be adjusted. Further, the leakage amount (leakage speed) of hydrogen gas can also be adjusted by adjusting the thickness, shape, etc. of the valve member 110. Therefore, by adjusting the number, size, position, etc. of the through-holes 1 75 of the surrounding member 1 7 0 and the thickness, shape, etc. of the valve member 1 1 0, fluctuations in the discharge reserve of the negative electrode 1 5 2 (Increase / decrease) can be appropriately suppressed, and deterioration of battery characteristics can be appropriately suppressed.
- the nickel-metal hydride storage battery 100 of Example 1 can be manufactured as follows.
- the positive electrode 15 1 is inserted into the plurality of separators 15 3 in the form of bags.
- a plurality of separators 15 3 and a plurality of negative electrodes 15 2 in which the positive electrodes 15 1 are inserted are alternately stacked to form a group of electrode plates 150 (see FIG. 1).
- this electrode plate group 1 5 0 is inserted into the battery case 1 30, the positive electrode 15 1 and a positive electrode terminal (not shown) are connected with a lead wire, and the negative electrode 15 2 and a negative electrode terminal (not shown) are connected. Connect with lead wires.
- a sealing plate 1 2 0 prepared separately is placed on the opening end face 1 3 1 of the battery case 1 30 and welded all around to seal the opening 1 3 2 of the battery case 1 3 0 (See Figure 2).
- the sealing plate 120 and the battery case 130 are integrated with no gap to form the case 1002.
- An alkaline aqueous solution having a specific gravity of about 1.3 is injected as an electrolytic solution from the gas discharge holes 1 2 2 formed in the sealing plate 1 2.
- the valve member 110 is inserted into the surrounding member 17 °.
- the large diameter end portion 1 6 2 of the coil panel 1 60 is directed to the ceiling portion 1 4 4 side of the safety valve case 1 4 0, and the coil panel 1 6 0 is disposed in the safety valve case 1 4 0.
- the surrounding member 1 7 0 in which the valve member 1 1 0 is inserted and disposed so that the flange portion 1 7 1 of the surrounding member 1 70 is brought into contact with the small diameter end portion 1 6 1 of the coil panel 1 60. Is placed in the safety valve case 140.
- the base plate 1 80 is fixed to the flange 1 4 8 of the safety valve case 1 4 0 by laser welding. Thereby, the safety valve device 1 0 1 is completed.
- this safety valve device 1 0 1 is placed on the outer peripheral surface 1 2 7 of the sealing plate 1 2 0 such that the central axis thereof coincides with the central axis of the gas discharge hole 1 2 2, and the sealing plate is formed by laser welding. Stick to 1 2 0 (case 1 0 2). In this way, the nickel metal hydride storage battery 100 of Example 1 can be manufactured.
- FIG. 2 The nickel-metal hydride storage battery 200 of Example 2 is different from the nickel-metal hydride storage battery 100 of Example 1 in the shape of the valve member and the surrounding member, and the other parts are the same.
- the surrounding member 2 70 according to the second embodiment is different from the surrounding member 1 70 according to the first embodiment in the number of through holes. Specifically, in the surrounding member 1 70 of Example 1, a large number of through holes 1 75 were provided in the side wall part 1 7 2 and the ceiling part 1 7 4 (see FIG. 2). In the surrounding member 2 70, the through hole 2 75 is provided only at one central position of the ceiling portion 2 74 (see FIG. 3).
- valve member 2 10 of the second embodiment has a convex wall portion 2 1 8 (side wall portion 2 1 2 and ceiling portion 2 1 4) having a shape that is different from that of the valve member 1 1 0 of the first embodiment.
- the side wall portion 1 1 2 of the valve member 1 1 0 according to the first embodiment has a flat cylindrical outer peripheral surface, but the side wall portion 2 1 2 of the valve member 2 1 0 according to the second embodiment.
- a large number of convex portions 2 1 2 b and thin-walled portions 2 are arranged alternately in the circumferential direction. 12 c, and the outer peripheral surface has an uneven shape.
- the ceiling 214 of the valve member 210 has convex portions 214 b (of the ceiling portion 214, the convex portion 2 of the ceiling portion 214) arranged at equal intervals in the circumferential direction.
- 1 4 b is the thin-walled part 214 c).
- the thickness of the thin portion 212c of the side wall portion 212 and the thickness of the thin portion 214c of the ceiling portion 214 are both 0.3 mm, and the valve member of Example 1 It is thinner than 1 10 (thickness 0.5 mm).
- hydrogen gas can easily pass through the valve member.
- Such a valve member 210 is inserted into the surrounding member 270 (see FIG. 3).
- the side wall portion 212 of the valve member 210 has an uneven shape, the thin portion 212 is brought into contact with (in close contact with) the inner peripheral surface 270 b of the surrounding member 270.
- a gap D can be provided between c and the inner peripheral surface 270 b of the surrounding member 270.
- the convex portion 214 b is formed on the ceiling portion 214 of the valve member 210, a gap portion E is provided between the thin portion 214 c of the ceiling portion 214 and the circumferential surface 270 b of the surrounding member 270. be able to.
- the gaps D and E communicate with the through hole 275 of the surrounding member 270 as shown in FIG. Therefore, the hydrogen gas that has permeated through the convex wall portion 218 (side wall portion 21 2 and ceiling portion 21 4) of the valve member 210 is guided to the gap portions D and E, and the through hole 275 of the surrounding member 270 is passed through the gap portions D and E. Can be smoothly leaked to the outside.
- the convex wall portion 218 corresponds to a wall portion that forms the valve space C and also corresponds to a hydrogen permeable portion.
- the nickel-metal hydride storage battery 300 of Example 3 is different from the nickel-hydrogen storage battery 200 of Example 2 in the shape of the valve member, and the other parts are the same.
- the valve member 310 of the third embodiment has a constant thickness (0.5 mm) and a side wall portion 312 that is bent in a bellows shape in the axial direction.
- the side wall 3 1 2 is bent into a bellows shape, so that the inner contact area in contact with the valve inner space C and the outer contact area in contact with the outside air are larger than those of the valve members 110 and 210 in the first and second embodiments.
- the amount of hydrogen permeated through the valve member can be increased, so that the hydrogen gas in the case 102 can easily leak out. Accordingly, since an appropriate amount of hydrogen leakage can be secured in the safety valve device 301, an increase in hydrogen in the battery can be appropriately suppressed.
- Example 3 the entire side wall portion 3 12 of the valve member 3 10 corresponds to the area increasing portion. Further, in the nickel-metal hydride storage battery 300 of Example 3, the convex wall portion 3 1 8 (side wall portion 3 1 2 and ceiling portion 3 1 4) corresponds to the wall portion forming the valve inner space C, and hydrogen It corresponds to the transmission part.
- the nickel-metal hydride storage battery 600 of the fourth embodiment is different from the first to third embodiments in the structure of the safety valve device, and the other parts are almost the same.
- the nickel-metal hydride storage battery 600 of Example 4 includes a case 6 0 2 having a sealing plate 6 2 0 and a battery case 1 3 0, a valve member 6 1 0, and a retaining member And 6 4 0.
- the sealing plate 6 20 has a recessed wall portion 6 21 that forms a recessed portion S that is recessed from the outer peripheral surface 6 2 7 to the inside of the battery case 1 30.
- the concave wall portion 6 2 1 has a substantially semicircular cylindrical shape, and as shown in FIG.
- the concave bottom portion 6 2 5 forming the bottom of the concave wall portion 6 2 1, the concave bottom portion 6 2 5 and the outer periphery
- the first concave side wall 6 2 3 connecting the surface 6 2 7 and the second side wall 6 2 4 facing the first concave side wall 6 2 3 connecting the concave bottom 6 2 5 and the outer peripheral surface 6 2 7 have.
- the concave bottom portion 6 25 has a cross section cut in a direction perpendicular to the direction connecting the first concave side wall portion 6 2 3 and the second concave side wall portion 6 2 4 (left and right direction in FIG. 10). It has a U-shaped (substantially semicircular) shape.
- the first concave side wall portion 6 2 3 is formed with a gas discharge hole 6 2 2 that penetrates the first concave side wall portion 6 2 3 and communicates the inside and the outside of the case 60 2.
- Such a sealing plate 6 20 is formed by, for example, pressing a metal plate having a predetermined dimension into a U-shaped (substantially semicircular) cross-sectional shape of the concave bottom portion 6 2 5.
- 1 Shape (recess S) After the formation, the first concave side wall portion 6 2 3 can be manufactured by drilling the gas discharge hole 6 2 2.
- the valve member 6 10 is a semi-cylindrical shape made of rubber (specifically, EP DM) and has a first through hole 6 1 2 b. 2, a second valve member 6 1 4 made of metal (specifically, nickel-plated steel plate) and having a second through hole 6 1 4 b, and a semi-cylindrical shape made of rubber (specifically EP DM) And the third valve member 6 1 3 surrounding the second valve member 6 1 4, and these are integrally molded. That is, the valve member 6 10 of the fourth embodiment is a rubber molded body in which the first valve member 6 1 2 and the third valve member 6 1 3 are formed on the second valve member 6 14 by insert molding. It is.
- valve member 6 10 is located in the recess S of the sealing plate 6 20.
- FIG. 10 they are arranged compressed in the left-right direction. At this time, the first through hole 6 1 2 b of the first valve member 6 1 2 and the second through hole 6 1 4 b of the second valve member 6 1 4 communicate with the gas discharge hole 6 2 2. Forms valve space C.
- the retaining plate 6 40 is fixed (welded) to the outer peripheral surface 6 2 7 of the sealing plate 6 20. Therefore, there is no possibility that the valve member 6 10 will fall out of the recess S.
- the safety valve device 6 is composed of the valve member 6 10, the recessed wall 6 2 1 formed on the sealing plate 6 2 0, and the retaining plate 6 4 0. 0 1 is configured.
- the valve member 6 1 0 etc. is arranged so as not to protrude from the outer peripheral surface 6 2 7 of the case 6 0 2 (sealing plate 6 2 0), so that the battery can be made small. Can do.
- the valve opening operation of the safety valve device 61 will be described.
- the annular seal portion 6 15 is attached to the first seal member while disposing a gas (such as hydrogen gas) in the valve internal space C of the valve member 6 10. ⁇
- the side wall 6 2 3 is in close contact with the gas exhaust hole 6 2 2.
- the rubber third valve member 6 13 is pressed by the gas inside the case 60 2 and the valve inner space C. Thus, it is compressively deformed in the right direction in FIG.
- the second valve member 6 1 4 and the first valve member 6 1 2 move in a direction away from the first concave side wall portion 6 2 3 (right direction in FIG. 10), and the seal portion 6 1 5 Is the first concave side wall A gap is formed between the seal part 6 15 and the first concave side wall part 6 2 3 apart from the part 6 2 3.
- the gas inside the case 62 can be properly discharged to the outside.
- valve member 6 1 0 is made by contacting the rubber first valve member 6 1 2 and the metal second valve member 6 1 4, and the rubber third valve member 6 1 3 and the metal
- the second valve member 6 1 4 is in contact with the second valve member 6 1 4. That is, between the first valve member 6 1 2 and the second valve member 6 14 and between the third valve member 6 13 and the second valve member 6 14 It has an interface that allows hydrogen gas to leak out.
- the hydrogen gas in the case 6 0 2 leaks to the outside of the battery in the same manner as the safety valve devices 1 0 1 to 3 0 1 of Examples 1 to 3. Can be issued. Specifically, the hydrogen gas introduced from the inside of the case 60 2 into the valve space C of the valve member 6 10 is divided into the first valve member 6 1 2 made of rubber and the second valve member 6 1 made of metal 6 1 4 and the gap between the rubber third valve member 6 13 and the metal second valve member 61 4 can be leaked out of the battery.
- the safety valve device 60 1 of the fourth embodiment also has a hydrogen that leaks the hydrogen gas in the case 60 2 to the outside of the battery in addition to the over-boosting prevention function for preventing the overpressure of the case 6 02 from being excessively increased. Has a leakage function. For this reason, even if the case 60 2 does not reach an excessive pressure boost, the hydrogen gas in the case 60 2 can be leaked out of the battery through the safety valve device 60 1.
- the increase of hydrogen in the battery due to corrosion of the storage alloy can be suppressed. Therefore, an increase in the discharge reserve of the negative electrode 15 2 can be suppressed, and a decrease in battery characteristics can be suppressed.
- the first valve member 6 1 2, the second valve member 6 1 4, and the third valve member 6 1 3 are arranged on the wall portion forming the valve inner space C. Equivalent to.
- FIGS. 1-5 Regard nickel-metal hydride storage battery 700 according to Example 5, FIGS.
- the nickel hydrogen storage battery 700 of the fifth embodiment is different from the first to third embodiments in the structure of the safety valve device, and the other parts are the same.
- the nickel metal hydride storage battery 700 according to Example 5 is shown in FIG. As shown, a safety valve device 7 0 1 is provided. As shown in FIG. 15, the safety valve device 70 1 has a valve member 7 10 and a safety valve case 7 40. Safety valve case 7
- the safety valve case 7 40 is made of metal (specifically, a nickel-plated steel plate) and has a bottomed substantially long cylindrical shape. Two circular through holes 7 4 4 b are formed in the ceiling portion 7 4 4 of the safety valve case 7 4. Further, two side walls 7 4 2 are formed at positions facing the substantially rectangular through-hole 7 4 2 b force.
- the safety valve case 7 40 is fixed on the outer peripheral surface 1 27 of the sealing plate 1 20.
- the valve member 7 10 is made of rubber (specifically, EP DM), and as shown in FIG. 17, as shown in FIG. 7 1 8
- the seal part 7 15 has a substantially rectangular parallelepiped shape, and two parallel parts 7 1 5 c parallel to each other and a substantially semicircular ring, and two parts connected to both ends of the straight part 7 15 c And a curved portion 7 1 5 d.
- the curved portion 7 15 d has a central portion in the height direction that is recessed in a curved shape, and has a substantially heart shape in cross section as shown in FIG.
- the hydrogen permeable portion 7 1 8 is thin (thickness: about 0.4 mm), and is accordion in the direction along the surface of the sealing plate 120 (left and right direction in the figure). It has a shape that extends in a curved shape. Specifically, it is curved in a bellows shape so that the distance from the sealing plate 120 is repeatedly changed as it proceeds from one curved portion 7 15 d to the other curved portion 7 15 5 d.
- such a valve member 7 10 is sealed from above by a safety valve case 7 4 0 at a position where the gas discharge hole 1 2 2 is closed on the surface of the sealing plate 1 2.
- the seal portion 7 15 is arranged in a state of being elastically compressed and deformed so that the portion 7 15 is pressed.
- the seal surface 7 1 5 of the seal part 7 15 is closely attached to the hole peripheral part 1 2 1 located around the gas discharge hole 1 2 2 in the sealing plate 1 2 0 without any gaps. Holes 1 2 2 can be sealed.
- the safety valve case 7400 corresponds to the holding member.
- Example 5 b is in close contact with the hole periphery 1 2 1.
- Figure 2-4 and Figure 15 As can be seen from the comparison, in Example 5, compared to Examples 1 to 3, it is possible to reduce the number of parts such as the coil spring 160 and the surrounding member 1 ⁇ 0, and to reduce the size of the safety valve device (particularly the case). The height of protrusion from the surface was reduced).
- Such a safety valve device 70 1 discharges the gas (hydrogen gas, etc.) in the case 1002 to the outside when the internal pressure of the case 102 exceeds a predetermined value, and the internal pressure of the case 1002 Prevent over-boosting. Specifically, when the internal pressure of the case 10 2 rises and exceeds a predetermined value, the seal portion 7 1 5 of the valve member 7 1 0 is caused by the gas in the case 10 2 as shown in FIG. Among them, the curved portion 7 15 d having a heart-shaped cross section is pressed upward, and the curved portion 7 15 d is compressed and deformed upward by this pressing force.
- the gas discharge hole 1 2 2 is formed between the curved portion 7 1 5 d of the sealing portion 7 15 and the peripheral portion 1 2 1 of the seal 7 1 5 which is in close contact with the peripheral portion 1 2 1 of the sealing plate 1 2 0.
- the communication path F that communicates with the outside appears. Through this communication path F, the gas in the case 102 can be discharged to the outside of the valve member 7 10 and to the outside of the battery through the through hole 7 4 2 b of the safety valve case 7 40. . In this way, it is possible to prevent the internal pressure of the case 102 from being excessively increased.
- the valve member 7 10 of the safety valve device 70 1 has a hydrogen permeation portion 7 1 8 made of rubber (EP DM) having a thin wall (about 0.4 mm thick).
- EP DM rubber
- the hydrogen gas in the case 102 is permeated through the hydrogen permeation section 7 1 8 from the space in the valve communicating with the gas discharge hole 1 2 2, and the through hole 7 4 4 in the safety valve case 7 4 0 It can be leaked outside the battery through b. That is, the safety valve device 70 1 can gradually leak the hydrogen gas in the case 100 2 to the outside of the battery even when the internal pressure of the case 100 2 is equal to or lower than a predetermined value.
- the hydrogen gas inside the case 102 can leak out of the battery through the safety valve device 70 1, so the hydrogen of the negative electrode 15 2 It is possible to suppress an increase in hydrogen in the battery due to corrosion of the storage alloy. Therefore, an increase in the discharge reserve of the negative electrode 15 2 can be suppressed, and a decrease in battery characteristics can be suppressed.
- Example 5 the hydrogen permeation part 7 1 8 is bent into a bellows shape. For this reason, the inner contact area in contact with the valve inner space C and the outer contact area in contact with the outside air can be increased in the hydrogen permeable portion 7 18. This allows hydrogen permeation through the valve member. Since the excess amount can be increased, the hydrogen gas in the case 102 can easily leak out. Accordingly, since an appropriate amount of hydrogen leakage can be secured in the safety valve device 70 1, an increase in hydrogen in the battery can be appropriately suppressed.
- Example 5 the entire hydrogen permeation portion 7 18 of the valve member 7 10 corresponds to the area increasing portion. Further, the hydrogen permeable portion 7 1 8 and the seal portion 7 1 5 correspond to the wall portion forming the valve inner space C.
- the valve member 7 10 includes the hydrogen permeation portion 7 1 8 (area increasing portion) and the seal portion 7 15. Comparing the heights seen from the perimeter of the hole 1 2 1, the hydrogen permeation part 7 1 8 (area increased part) has a lower V shape.
- the shape of the valve member 7 10 is not a convex shape protruding from the seal portion 7 15 (without forming a convex wall portion). 1 8 (area increasing portion) is formed.
- the nickel hydride storage battery 800 of Example 6 differs from the nickel hydride storage battery 700 of Example 5 in the form of the hydrogen permeable portion of the valve member.
- the other is the same.
- the configuration of the hydrogen permeable portion 7 18 is in the direction along the surface of the sealing plate 120 ( Direction) in a bellows shape.
- the valve member 8 10 of Example 6 is bent into a bellows shape in a direction perpendicular to the surface of the sealing plate 120 (upward in the figure).
- a hydrogen permeation portion 8 1 8 extending in the form of a ring.
- the hydrogen permeable portion 8 18 expands radially outward from the center of the valve member 8 10, reverses to shrink radially inward, and further reverses to expand diameter.
- the shape reaches the seal part 8 1 5.
- the hydrogen permeable part 8 1 8 of this form is the same as the hydrogen permeable part 7 1 8 of Example 5.
- the inner contact area in contact with the valve inner space C and the outer contact area in contact with the outside air can be increased.
- the amount of hydrogen permeating through the valve member can be increased, so that the hydrogen gas in the case 102 can easily leak out. Therefore, since an appropriate amount of hydrogen leakage can be secured in the safety valve device 80 1, an increase in hydrogen in the battery can be appropriately suppressed.
- Example 6 the entire hydrogen permeable portion 8 18 of the valve member 8 10 corresponds to the area increasing portion. Further, the hydrogen permeable portion 8 1 8 and the seal portion 8 1 5 correspond to the wall portion forming the valve inner space C.
- the shape of the valve member 8 10 is not a convex shape protruding from the seal portion 8 15 (without forming a convex wall portion), and the hydrogen permeable portion 8 1 8 (area increasing portion) is formed.
- the protrusion height from the surface of a case can be made low, and the size reduction of a battery can be achieved by extension.
- the nickel hydrogen storage battery 110 of the seventh embodiment is different from the nickel hydrogen storage battery 700 of the fifth embodiment in the form of the hydrogen permeable portion of the valve member, Others are the same. Specifically, in the valve member 7 10 of Example 5, as shown in FIG. 15, the hydrogen permeation portion 7 18 was bent and extended in a bellows shape. On the other hand, in the valve member 1 1 1 0 of the present embodiment! 17, as shown in FIGS. 20 and 21, the hydrogen permeable portion 1 1 1 8 is opened upward 1 1 1 1 8 c And a plurality of bottomed cylindrical projections 1 1 1 8 b that protrude downward and extend. The hydrogen permeation section 1 1 1 8 is thin as a whole (thickness is about 0.4 mm), similarly to the hydrogen permeation section 7 1 8 of Example 5.
- the hydrogen permeation part 1 1 1 8 of this configuration is the same as the hydrogen permeation part 7 1 8 of Example 5. Similarly, the inner contact area in contact with the valve inner space C and the outer contact area in contact with the outside air can be increased. As a result, the amount of hydrogen permeating through the valve member can be increased, so that the hydrogen gas in the case 102 can easily leak out. Accordingly, since an appropriate hydrogen leakage amount can be ensured in the safety valve device 110 1, an increase in hydrogen in the battery can be appropriately suppressed.
- the protrusion 1 1 1 8b corresponds to the area increasing portion in the hydrogen permeation portion 1 1 1 8 ′ of the valve member 1 1 1 10. Further, the hydrogen permeation portion 1 1 1 8 and the seal portion 1 1 1 5 force correspond to the wall portion forming the valve inner space C.
- the hydrogen permeation part 1 1 1 8 (area increasing part) and the seal part 1 1 1 5 are compared in height viewed from the hole surrounding part 1 2 1, the hydrogen permeation part Part 1 1 1 8 (area increasing part) has a lower form.
- the shape of the valve member 1 1 1 0 is not a convex shape protruding from the seal portion 1 1 1 5 (without forming a convex wall portion), and the hydrogen permeable portion 1 1 1 8 (increase in area) Part).
- the nickel-metal hydride storage battery 100 according to the eighth embodiment is different from the nickel-metal hydride storage battery 700 according to the fifth embodiment only in the safety valve device, and the others are the same.
- the safety valve device 1001 of the eighth embodiment has a safety valve case 1004, as shown in FIG.
- This safety valve case 10 40 is the same as the safety valve case 7 40 of the fifth embodiment except that the position of the through hole formed in the side wall portion is different.
- a substantially rectangular through-hole 10 4 2 b is provided at a position where the side wall portion 7 4 2 extends in the longitudinal direction at a position facing the 2 2. Is formed.
- valve member 10 0 10 of the eighth embodiment is different from the valve member 7 4 0 of the fifth embodiment (see FIG. 17) in that the seal portion and the hydrogen permeation The form of the parts is different.
- the valve member 10 0 10 of the eighth embodiment has a substantially rectangular annular seal portion 10 0. 1 5 and a hydrogen permeation portion 1 0 1 8 located inside this.
- the seal portion 1 0 15 has a substantially rectangular parallelepiped shape, and a pair of first rectangular portions 1 0 1 5 c parallel to each other, and a pair of second rectangular portions that have a substantially rectangular parallelepiped shape and are parallel to each other 1 0 1 5 d and a connecting part 1 0 1 5 e which is located at a corner of the seal part 1 0 1 5 and connects the first straight part 1 0 1 5 c and the second straight part 1 0 1 5 d have.
- the connecting portion 1 0 15 5 e is thicker in the direction along the sealing surface 1 0 15 5 b than the first straight portion 1 0 15 5 c and the second straight portion 1 0 15 5 d. Is getting thicker.
- the seal portion 1 0 1 5 (the first straight portion 1 0 15 5 c, the second straight portion 1 0 15 5 d, and the connecting portion 1 0 15 5 e) is arranged in the height direction (seal surface 1 (The direction perpendicular to 0 1 5 b)
- the central part is recessed in a curved shape toward the inside, and as shown in FIG. 24, it has a substantially heart-shaped cross section.
- the hydrogen permeation portion 10 0 18 is a thin bellows (thickness of about 0.4 mm) and bellows similarly to the hydrogen permeation portion 7 1 8 of the valve member 7 10 of Example 5. It is a form that extends in a curved shape. Specifically, as the distance from the sealing plate 120 changes repeatedly from one first straight part 1 0 15 5 c to the other first straight part 1 0 15 5 c, the bellows It's in a shape. However, in Example 5, the hydrogen permeation part was configured to bend and extend in a bellows shape in the longitudinal direction of the valve member 7 10 (see FIG. 17). ⁇ In Example 8, FIG. 23 As shown in FIG. 4, the valve member 10 10 is configured to bend and extend in a bellows shape in the short direction of the valve member 100 (the direction along the second straight portion 10 15 15 d).
- such a valve member 10 10 is located at a position where the gas discharge hole 1 2 2 is closed on the surface of the sealing plate 120, and a seal portion is formed by a safety valve case 1 040 from above.
- the seal portion 1 0 1 5 is arranged in a state of being elastically compressed and deformed so that the 1 0 15 is pressed.
- the sealing surface 1 0 15 5 b force of the sealing portion 1 0 15 5 is in close contact with the hole peripheral portion 1 2 1 without any gap, so that the gas discharge hole 122 can be sealed.
- the seal portion 10 0 15 itself presses the hole surrounding portion 1 21 via the seal surface 1 0 15 5 b by the elasticity of the seal portion 1 0 15 5, thereby The surface 1 0 1 5 b can be brought into close contact with the hole surrounding portion 1 2 1.
- the safety valve case 1 040 corresponds to the holding member.
- the gas in the case 1002 is discharged to the outside of the valve member 1001 and to the outside of the battery through the through hole 1 0 4 2b of the safety valve case 1 0 40 0. be able to. In this way, it is possible to prevent the internal pressure of the case 102 from being excessively increased.
- the hydrogen gas in the case 102 passes through the hydrogen permeation section 10 0 18 from the valve space C communicating with the gas discharge hole 12 2 2. Can be leaked to the outside of the battery through the through hole 1 0 4 4 b of the safety valve case 1 0 4 0.
- the hydrogen permeation portion 10 18 is bent into a bellows shape, thereby increasing the inner contact area in contact with the valve space C and the outer contact area in contact with the outside air. The permeability can be improved. Accordingly, since the appropriate amount of hydrogen leakage can be ensured in the safety valve device 1001, an increase in hydrogen in the battery can be appropriately suppressed.
- the entire hydrogen permeation portion 1 0 1 8 of the valve member 10 10 10 corresponds to the area increasing portion. Further, the hydrogen permeable portion 10 1 8 and the seal portion 1 0 1 5 correspond to the wall portion forming the valve inner space C.
- the hydrogen permeation portion 1 0 1 8 (area increasing portion) and the seal portion 1 0 1 5 are compared with each other in terms of the height viewed from the hole surrounding portion 1 2 1.
- Part 1 0 1 8 (area increasing part) has a lower form.
- the shape of the valve member 10 1 0 10 is not a convex shape protruding from the seal portion 1 0 15 (without forming a convex wall portion), and the hydrogen permeable portion 1 0 1 8 (increase in area) Part).
- Example 3 the side contact portion of the valve member 3 10 was bent into a bellows shape, thereby increasing the inner contact area in contact with the valve inner space C and the outer contact area in contact with the outside air.
- the form of increasing the inner contact area and the outer contact area is not limited to such a form.
- the side wall 4 1 2 may be bent zigzag along the circumferential direction. Even in such a configuration, the inner contact area can be increased on the inner wall surface 4 1 2 b of the side wall 4 1 2, and the outer contact area can be increased on the outer wall surface 4 1 2 c. For this reason, the amount of hydrogen permeating through the valve member can be increased, and the hydrogen gas in the case 102 can easily leak out.
- the entire side wall portion 4 12 corresponds to the area increasing portion. Further, the side wall part 4 1 2 and the ceiling part 4 1 4 correspond to the wall part forming the valve inner space C and also to the hydrogen permeation part.
- a large number of protruding portions 5 1 3 are provided on the convex wall portion 5 1 8 (side wall portion 5 1 2 and ceiling portion 5 1 4) in a distributed manner. You may do it.
- the inner contact area can be increased on the inner surface 5 1 3 b of the protrusion 5 1 3, and the outer contact area can be increased on the outer surface 5 1 3 c of the protrusion 5 1 3. be able to. For this reason, the amount of hydrogen permeating through the valve member can be increased, and the hydrogen gas in the case 102 can easily leak out.
- the protruding portion 5 13 corresponds to an area increasing portion.
- the convex wall portion 5 1 8 corresponds to a wall portion forming the valve inner space C and also corresponds to a hydrogen permeable portion.
- the entire case 102, 602 is made of metal, but it may be made of metal and resin, or made of resin alone.
- the through-hole 2 75 is formed only in the ceiling portion 2 74 of the surrounding member 2 70, but as in the first embodiment, the through-hole is also formed in the side wall portion 2 7 2. You may do it. By forming a through hole in the side wall 2 72, hydrogen gas leaks to the outside of the battery. It becomes easy to put out.
- Example 5 as shown in FIG. 17, the form of the hydrogen permeable portion 7 1 8 of the valve member 7 10 is arranged inside the substantially oval seal portion 7 15 and the seal portion 7 1 In the extending direction of the 5 straight portions 7 1 5 c, the bellows was bent and extended.
- the hydrogen permeation portion is not limited to such a form, and as shown in the 19th section, inside the substantially oval annular seal portion 9 15 in the direction toward the center of the oval. It is also possible to adopt a form (hydrogen permeation portion 9 1 8) that extends in a bellows shape. Even if this valve member 9 10 is used, the hydrogen permeability can be improved and the protruding height of the safety valve device can be reduced.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Gas Exhaust Devices For Batteries (AREA)
- Sealing Battery Cases Or Jackets (AREA)
- Secondary Cells (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/630,329 US7807282B2 (en) | 2004-07-02 | 2005-06-29 | Nickel-metal hydride storage battery |
CN2005800217154A CN1977406B (zh) | 2004-07-02 | 2005-06-29 | 镍氢蓄电池 |
EP05758115.9A EP1798788B1 (en) | 2004-07-02 | 2005-06-29 | Nickel-metal hydride storage battery |
KR1020077002638A KR100855695B1 (ko) | 2004-07-02 | 2005-06-29 | 니켈수소축전지 |
JP2006523773A JP4770735B2 (ja) | 2004-07-02 | 2005-06-29 | ニッケル水素蓄電池 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004-196821 | 2004-07-02 | ||
JP2004196821 | 2004-07-02 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006004143A1 true WO2006004143A1 (ja) | 2006-01-12 |
Family
ID=35782942
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2005/012443 WO2006004143A1 (ja) | 2004-07-02 | 2005-06-29 | ニッケル水素蓄電池 |
Country Status (6)
Country | Link |
---|---|
US (1) | US7807282B2 (ja) |
EP (1) | EP1798788B1 (ja) |
JP (1) | JP4770735B2 (ja) |
KR (1) | KR100855695B1 (ja) |
CN (1) | CN1977406B (ja) |
WO (1) | WO2006004143A1 (ja) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007179818A (ja) * | 2005-12-27 | 2007-07-12 | Toyota Motor Corp | ニッケル水素蓄電池 |
WO2008124989A1 (en) | 2007-04-16 | 2008-10-23 | Byd Company Limited | A safety valve for battery |
JP2009151944A (ja) * | 2007-12-18 | 2009-07-09 | Panasonic Ev Energy Co Ltd | 二次電池 |
JP2018525805A (ja) * | 2015-07-28 | 2018-09-06 | ビメッド テクニク アレトラー サナイ ベ ティジャーレット エー. エス. | 圧力調整装置 |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010232089A (ja) * | 2009-03-27 | 2010-10-14 | Sanyo Electric Co Ltd | 密閉型電池 |
KR101191657B1 (ko) * | 2010-07-19 | 2012-10-17 | 에스비리모티브 주식회사 | 전지 모듈 |
WO2014033822A1 (ja) * | 2012-08-28 | 2014-03-06 | 日立ビークルエナジー株式会社 | 角形二次電池 |
US9947908B2 (en) | 2013-07-25 | 2018-04-17 | Johnson Controls Technology Company | Vent housing for advanced batteries |
CN104319360B (zh) * | 2014-11-11 | 2017-01-25 | 东莞新能源科技有限公司 | 锂离子电池和电池包 |
JP6350480B2 (ja) * | 2015-10-05 | 2018-07-04 | トヨタ自動車株式会社 | 密閉型電池 |
JP6836204B2 (ja) * | 2018-01-23 | 2021-02-24 | 株式会社デンソー | 電池パック |
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- 2005-06-29 US US11/630,329 patent/US7807282B2/en not_active Expired - Fee Related
- 2005-06-29 EP EP05758115.9A patent/EP1798788B1/en not_active Expired - Fee Related
- 2005-06-29 KR KR1020077002638A patent/KR100855695B1/ko not_active IP Right Cessation
- 2005-06-29 JP JP2006523773A patent/JP4770735B2/ja not_active Expired - Fee Related
- 2005-06-29 CN CN2005800217154A patent/CN1977406B/zh not_active Expired - Fee Related
- 2005-06-29 WO PCT/JP2005/012443 patent/WO2006004143A1/ja active Application Filing
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Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007179818A (ja) * | 2005-12-27 | 2007-07-12 | Toyota Motor Corp | ニッケル水素蓄電池 |
WO2008124989A1 (en) | 2007-04-16 | 2008-10-23 | Byd Company Limited | A safety valve for battery |
EP2137777A1 (en) * | 2007-04-16 | 2009-12-30 | Byd Company Limited | A safety valve for battery |
EP2137777A4 (en) * | 2007-04-16 | 2010-06-02 | Byd Co Ltd | BATTERY SAFETY VALVE |
JP2010524181A (ja) * | 2007-04-16 | 2010-07-15 | ビーワイディー カンパニー リミテッド | 新型の電池安全弁 |
JP2009151944A (ja) * | 2007-12-18 | 2009-07-09 | Panasonic Ev Energy Co Ltd | 二次電池 |
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JP2018525805A (ja) * | 2015-07-28 | 2018-09-06 | ビメッド テクニク アレトラー サナイ ベ ティジャーレット エー. エス. | 圧力調整装置 |
Also Published As
Publication number | Publication date |
---|---|
US7807282B2 (en) | 2010-10-05 |
EP1798788A4 (en) | 2008-10-22 |
KR100855695B1 (ko) | 2008-09-03 |
EP1798788B1 (en) | 2015-03-18 |
EP1798788A1 (en) | 2007-06-20 |
JPWO2006004143A1 (ja) | 2008-04-24 |
US20080020268A1 (en) | 2008-01-24 |
JP4770735B2 (ja) | 2011-09-14 |
KR20070034083A (ko) | 2007-03-27 |
CN1977406B (zh) | 2010-05-12 |
CN1977406A (zh) | 2007-06-06 |
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