WO2004077594A1 - Stair type electrode plate and nickel/metal hydryde secondary battery having the same - Google Patents

Stair type electrode plate and nickel/metal hydryde secondary battery having the same Download PDF

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Publication number
WO2004077594A1
WO2004077594A1 PCT/KR2003/001611 KR0301611W WO2004077594A1 WO 2004077594 A1 WO2004077594 A1 WO 2004077594A1 KR 0301611 W KR0301611 W KR 0301611W WO 2004077594 A1 WO2004077594 A1 WO 2004077594A1
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WO
WIPO (PCT)
Prior art keywords
substrate
stepped cone
electrode plate
secondary battery
active material
Prior art date
Application number
PCT/KR2003/001611
Other languages
French (fr)
Inventor
Dong-Pil Park
Original Assignee
Energreen Co Ltd
Dong-Pil Park
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Energreen Co Ltd, Dong-Pil Park filed Critical Energreen Co Ltd
Priority to AU2003257715A priority Critical patent/AU2003257715A1/en
Publication of WO2004077594A1 publication Critical patent/WO2004077594A1/en

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H01M4/70—Carriers or collectors characterised by shape or 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
    • H01M10/34—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
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
    • H01M4/52—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M6/00—Primary cells; Manufacture thereof
    • H01M6/42—Grouping of primary cells into batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • 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, in general, to electrode plates and nickel/metal hydride secondary batteries having the same, and, in particular, to an electrode plate comprising a substrate, a part of which is folded in a stepped cone shape, and a nickel/metal hydride secondary battery having the same.
  • hydrogen is a clean energy source. That is, hydrogen is converted to water upon a burning process, different from other fossil fuels. Upon discharge of electrical energy, hydrogen is oxidized to water, which is then reduced to hydrogen upon the charging of electrical energy.
  • nickel/metal hydride secondary battery a nickel electrode made by using nickel hydroxide as an active material is employed as a positive plate, and a hydrogen electrode formed by using metal hydride as the active material is applied as a negative plate.
  • the electrode plate such as the positive plate or negative plate, of the nickel/metal hydride secondary battery is manufactured as follows. First, the active material, a conductive binder, a thickening agent and water are introduced into a reactor and mixed with vigorously stirring, to prepare a paste-type active material composition. Then, such an active material composition is coated on a steel substrate, after which a dry compressing process is performed, thereby obtaining a desired electrode plate. Further, the substrate contains a plurality of pores so that an electrolytic solution is easily moved to increase conductivity.
  • FIG. la is a top view of an electrode plate of a conventional nickel/metal hydride secondary battery
  • FIG. lb is a cross-sectional view taken along the line A- A' of FIG. la.
  • active materials are attached onto a flat substrate, thereby forming the conventional electrode plate.
  • Another object of the present invention is to alleviate the problems encountered in the related art and to provide an electrode plate, acting to decrease the separation of an active material attached to a substrate. Another object of the present invention is to provide a nickel/metal hydride secondary battery comprising the electrode plate.
  • an electrode plate of a secondary battery including a substrate having predetermined pores; and an active material layer coated on both sides of the substrate.
  • the substrate has a first stepped cone and a second stepped cone.
  • the first stepped cone is formed at one side of the substrate, and has a pore at it's top point.
  • the second stepped cone is formed at the other side of the substrate, and has a pore at it's top point.
  • the first stepped cone and the second stepped cone are disposed to be adjacent in at least one direction.
  • a nickel/metal hydride secondary battery including a plurality of negative plates each connected to a negative pole, a plurality of positive plates each connected to a positive pole, and a plurality of separators disposed between the negative plates and the positive plates.
  • the negative plates and/or the positive plates are realized by the electrode plate of the secondary battery of the present invention.
  • FIG. la is a top view of an electrode plate of a conventional nickel/metal hydride secondary battery
  • FIG. lb is a cross-sectional view taken along the line A- A' of FIG. la;
  • FIG. 2 is a cross-sectional view showing an inner structure of a nickel/metal hydride secondary battery, according to an embodiment of the present invention
  • FIGS. 3a and 3b show a part of an electrode plate, such as a positive plate or a negative plate, of a nickel/metal hydride secondary battery, according to an embodiment of the present invention, in which FIG. 3 a is a top view of the electrode plate, and FIG. 3b is a cross-sectional view taken along the line A- A' of FIG. 3 a; and FIGS. 4a and 4b show a part of an electrode plate, such as a positive plate or a negative plate, of a nickel/metal hydride secondary battery, according to another embodiment of the present invention, in which FIG. 4a is a top view of the electrode plate, and FIG. 4b is a cross-sectional view taken along the line A-A' of FIG. 4a.
  • FIG. 2 shows an inner structure of a nickel/metal hydride secondary battery, according to an embodiment of the present invention.
  • the nickel/metal hydride secondary battery includes a plurality of negative plates 110 and a plurality of positive plates 120 disposed alternately, and a plurality of separators 130 positioned between the negative plates 110 and the positive plates 120, in a housing 100.
  • the negative plates 110 each are connected to a negative pole (not shown), and have a planar negative substrate 112 and a negative active material layer 114 formed on the negative substrate 112.
  • the negative substrate 112 is formed in a planar shape through a rolling process of a nickel (Ni) fiber, and, upon charge and discharge, the negative active material of the fiber is separated.
  • the negative active material layer 114 is obtained by coating metal hydride on the negative substrate 112, and, upon charge and discharge, acts to release and absorb hydrogen. Further, upon over-charge, the active material layer 114 serves to absorb gas generated from the positive plate 120.
  • Respective positive plates 120 are connected to a positive pole (not shown), and have a positive substrate 122 and a positive active material layer 124 formed on the positive substrate 122.
  • the positive substrate 122 is formed of the nickel fiber made by the composition and method same as the negative substrate 112, and upon charge and discharge, the positive active material of the fiber is separated.
  • Respective separators 130 function to separate the negative plate 110 from the neighboring positive plate 120, and thus to prevent a short circuit between the negative plate 110 and the positive plate 120.
  • FIGS. 3a and 3b there is shown a part of an electrode plate, such as a negative plate or a positive plate, of a nickel/metal hydride secondary battery, according to an embodiment of the present invention.
  • FIG. 3 a is a top view of the electrode plate
  • FIG. 3b is a cross-sectional view taken along the line A-A' of FIG. 3a.
  • the electrode plate of FIGS. 3a and 3b may be applied as the positive plate or negative plate, a description will be given of the present invention on the basis of the positive plate, for convenience.
  • a positive plate 320 used for the nickel/metal hydride secondary battery includes a positive substrate 322 as a nickel sheet which is formed with a plurality of pores 322al, 322a2, 322b 1 and 322b2, and a positive active material layer 324 attached /
  • the substrate 322 has a first stepped cone CIRl and a second stepped cone CIR2, in which there are the pores 322al, 322a2, 322M and 322b2 at top points of the first stepped cone CIRl and the second stepped cone CIR2.
  • the first 5 stepped cone CIRl represented by a circular real line in FIG. 3 a indicates a protruded form in an upper direction as the top point at which the pores 322al and 322a2 are formed, in FIG. 3b.
  • the second stepped cone CIR2 represented by a circular dotted line in FIG. 3 a indicates a depressed form in a lower direction as the top point at which the pores 322bl and 322b2 are formed, in FIG. 3b.
  • the circles represented by the real line and the dotted line in FIG. 3 a are given in edges of the steps of the stepped cones and the pores in FIG. 3b.
  • the first stepped cone CIRl and the second stepped cone CIR2 are alternately disposed with respect to a longitudinal direction (A-A' direction) and a transverse direction (B-B' direction).
  • the positive active material layer 324 is formed by filling nickel hydride 15 powders added with a cobalt compound as a conductive material into the pores 322al, 322a2, 322b 1 and 322b2 of the positive plate 322.
  • the steps of the substrate can act to prevent the horizontal movement of the active material layer 324 attached to the substrate 322. Further, a contact surface between the active material 20 layer 324 and the substrate 322 increases, whereby adhesivity between the substrate 322 and the active material layer 324 becomes high. Thus, the substrate shown in FIGS. 3a and 3b decreases the separation of the active materials from the substrate 322.
  • FIGS. 4a and 4b show a part of an electrode plate, such as a positive plate or a negative plate, of a nickel/metal hydride secondary battery, according to another embodiment of the present invention.
  • FIG. 4a is a top view of the elecfrode plate of the secondary battery, according to the embodiment of the present invention, and
  • FIG. 4b is a cross-sectional view taken along the line A-A' of FIG. 4a.
  • the elecfrode plate of FIGS. 4a and 4b are similar to that of FIGS. 3a and 3b, it is different in the step number of the stepped cone. That is, in FIGS. 3a and 3b, all the stepped cones of the substrate have three steps, however, in FIGS. 4a and 4b, the three-stepped cone is used, together with the two-stepped cone. As shown in FIGS. 4a and 4b, the substrate is realized in the combination of the three-stepped cone and the two-stepped cone, in which the three-stepped cone functions as a core, whereby the separation of the active material can be further effectively prevented.
  • the present invention provides a stepped cone type electrode plate and a nickel/metal hydride secondary battery having the same, in which a substrate of the electrode plate is formed in a stepped cone shape, and thus a horizontal movement of an active material layer attached to the substrate can be restrained.
  • a contact surface between the active material layer and the substrate increases, whereby adhesivity therebetween becomes high. Therefore, the use of the inventive electrode plate results in reduction of the separation of the active materials from the substrate.
  • the separation of the active material is decreased, thus increasing the stability of the battery.
  • the pores of the present invention may be formed in oval, rectangular, polygonal and rhombic shapes, in addition to the circle.
  • the stepped cone type electrode plate the stepped cone may include the combination of a one-stepped cone and a four-stepped cone, as well as only the three-stepped cone or the combination of the three-stepped cone and the two-stepped cone.
  • the stepped cone has the top points formed at not only both sides but also only one side of the substrate. Therefore, it is to be understood that within the scope of the appended claims, the invention may be practiced otherwise than as specifically described.

Abstract

Disclosed is a stepped cone type electrode plate and nickel/metal hydride secondary battery having the same. The electrode plate of the secondary battery of the current invention includes a substrate having predetermined pores, and an active material layer coated at both sides of the substrate. Further, the substrate has at least one stepped cone. As for the inventive electrode plate, the substrate is stepped cone-shaped, whereby a horizontal movement of the active material layer attached to the substrate can be prevented. Also, a contact surface between the active material layer and the substrate increases and hence adhesivity therebetween becomes high. Thereby, the use of the inventive electrode plate results in a decreased separation of the active material from the substrate. Moreover, in the nickel/metal hydride secondary battery using the inventive electrode plate, the separation of the active material is decreased, therefore increasing the stability of the battery.

Description

STAIR TYPE ELECTRODE PLATE AND NICKEL/METAL HYDRYDE SECONDARY BATTERY HAVING THE SAME
[ Technical Field ]
The present invention relates, in general, to electrode plates and nickel/metal hydride secondary batteries having the same, and, in particular, to an electrode plate comprising a substrate, a part of which is folded in a stepped cone shape, and a nickel/metal hydride secondary battery having the same.
[ Background Art ]
In general, hydrogen is a clean energy source. That is, hydrogen is converted to water upon a burning process, different from other fossil fuels. Upon discharge of electrical energy, hydrogen is oxidized to water, which is then reduced to hydrogen upon the charging of electrical energy.
Meanwhile, where oxygen is used as a positive plate, hydrogen reacts undesirably with oxygen in a container so long as a specific battery structure is not formed. To solve the problem, intensive research on nickel/metal hydride secondary batteries has been performed. As for the nickel/metal hydride secondary battery, a nickel electrode made by using nickel hydroxide as an active material is employed as a positive plate, and a hydrogen electrode formed by using metal hydride as the active material is applied as a negative plate.
The electrode plate, such as the positive plate or negative plate, of the nickel/metal hydride secondary battery is manufactured as follows. First, the active material, a conductive binder, a thickening agent and water are introduced into a reactor and mixed with vigorously stirring, to prepare a paste-type active material composition. Then, such an active material composition is coated on a steel substrate, after which a dry compressing process is performed, thereby obtaining a desired electrode plate. Further, the substrate contains a plurality of pores so that an electrolytic solution is easily moved to increase conductivity.
FIG. la is a top view of an electrode plate of a conventional nickel/metal hydride secondary battery, and FIG. lb is a cross-sectional view taken along the line A- A' of FIG. la. As shown in FIGS, la and lb, active materials are attached onto a flat substrate, thereby forming the conventional electrode plate.
However, such an electrode plate having the flat substrate is disadvantageous in terms of easy horizontal movement of the active materials attached to both sides of the substrate, and low adhesivity between the substrate and the active material, thus easy separation of the active materials.
[ Disclosure of Invention 1
Therefore, it is an object of the present invention to alleviate the problems encountered in the related art and to provide an electrode plate, acting to decrease the separation of an active material attached to a substrate. Another object of the present invention is to provide a nickel/metal hydride secondary battery comprising the electrode plate.
To achieve the above objects of the present invention, there is provided an electrode plate of a secondary battery, including a substrate having predetermined pores; and an active material layer coated on both sides of the substrate. The substrate has a first stepped cone and a second stepped cone. The first stepped cone is formed at one side of the substrate, and has a pore at it's top point. Further, the second stepped cone is formed at the other side of the substrate, and has a pore at it's top point. The first stepped cone and the second stepped cone are disposed to be adjacent in at least one direction.
Moreover, there is provided a nickel/metal hydride secondary battery, including a plurality of negative plates each connected to a negative pole, a plurality of positive plates each connected to a positive pole, and a plurality of separators disposed between the negative plates and the positive plates. The negative plates and/or the positive plates are realized by the electrode plate of the secondary battery of the present invention.
[ Brief Description of Drawings ]
The above and other objects, features and other advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:
FIG. la is a top view of an electrode plate of a conventional nickel/metal hydride secondary battery;
FIG. lb is a cross-sectional view taken along the line A- A' of FIG. la;
FIG. 2 is a cross-sectional view showing an inner structure of a nickel/metal hydride secondary battery, according to an embodiment of the present invention;
FIGS. 3a and 3b show a part of an electrode plate, such as a positive plate or a negative plate, of a nickel/metal hydride secondary battery, according to an embodiment of the present invention, in which FIG. 3 a is a top view of the electrode plate, and FIG. 3b is a cross-sectional view taken along the line A- A' of FIG. 3 a; and FIGS. 4a and 4b show a part of an electrode plate, such as a positive plate or a negative plate, of a nickel/metal hydride secondary battery, according to another embodiment of the present invention, in which FIG. 4a is a top view of the electrode plate, and FIG. 4b is a cross-sectional view taken along the line A-A' of FIG. 4a.
[ Best Mode for Carrying Out the Invention ]
Reference should now be made to the drawings, in which the same reference numerals are used throughout the different drawings to designate the same or similar components. Hereinafter, a detailed description will be given of a nickel/metal hydride secondary battery according to preferred embodiments of the present invention, in conjunction with the appended drawings.
FIG. 2 shows an inner structure of a nickel/metal hydride secondary battery, according to an embodiment of the present invention. As shown in FIG. 2, the nickel/metal hydride secondary battery includes a plurality of negative plates 110 and a plurality of positive plates 120 disposed alternately, and a plurality of separators 130 positioned between the negative plates 110 and the positive plates 120, in a housing 100.
The negative plates 110 each are connected to a negative pole (not shown), and have a planar negative substrate 112 and a negative active material layer 114 formed on the negative substrate 112.
The negative substrate 112 is formed in a planar shape through a rolling process of a nickel (Ni) fiber, and, upon charge and discharge, the negative active material of the fiber is separated. The negative active material layer 114 is obtained by coating metal hydride on the negative substrate 112, and, upon charge and discharge, acts to release and absorb hydrogen. Further, upon over-charge, the active material layer 114 serves to absorb gas generated from the positive plate 120. Respective positive plates 120 are connected to a positive pole (not shown), and have a positive substrate 122 and a positive active material layer 124 formed on the positive substrate 122.
The positive substrate 122 is formed of the nickel fiber made by the composition and method same as the negative substrate 112, and upon charge and discharge, the positive active material of the fiber is separated.
Respective separators 130 function to separate the negative plate 110 from the neighboring positive plate 120, and thus to prevent a short circuit between the negative plate 110 and the positive plate 120.
Turning now to FIGS. 3a and 3b, there is shown a part of an electrode plate, such as a negative plate or a positive plate, of a nickel/metal hydride secondary battery, according to an embodiment of the present invention. FIG. 3 a is a top view of the electrode plate, and FIG. 3b is a cross-sectional view taken along the line A-A' of FIG. 3a. Although the electrode plate of FIGS. 3a and 3b may be applied as the positive plate or negative plate, a description will be given of the present invention on the basis of the positive plate, for convenience.
As shown in FIGS. 3a and 3b, a positive plate 320 used for the nickel/metal hydride secondary battery, according to the embodiment of the present invention, includes a positive substrate 322 as a nickel sheet which is formed with a plurality of pores 322al, 322a2, 322b 1 and 322b2, and a positive active material layer 324 attached /
to the positive substrate 322.
Specifically, the substrate 322 has a first stepped cone CIRl and a second stepped cone CIR2, in which there are the pores 322al, 322a2, 322M and 322b2 at top points of the first stepped cone CIRl and the second stepped cone CIR2. The first 5 stepped cone CIRl represented by a circular real line in FIG. 3 a indicates a protruded form in an upper direction as the top point at which the pores 322al and 322a2 are formed, in FIG. 3b. Whereas, the second stepped cone CIR2 represented by a circular dotted line in FIG. 3 a indicates a depressed form in a lower direction as the top point at which the pores 322bl and 322b2 are formed, in FIG. 3b. 10 The circles represented by the real line and the dotted line in FIG. 3 a are given in edges of the steps of the stepped cones and the pores in FIG. 3b. The first stepped cone CIRl and the second stepped cone CIR2 are alternately disposed with respect to a longitudinal direction (A-A' direction) and a transverse direction (B-B' direction).
The positive active material layer 324 is formed by filling nickel hydride 15 powders added with a cobalt compound as a conductive material into the pores 322al, 322a2, 322b 1 and 322b2 of the positive plate 322.
By the stepped cone-shaped substrate shown in FIGS. 3a and 3b, the steps of the substrate can act to prevent the horizontal movement of the active material layer 324 attached to the substrate 322. Further, a contact surface between the active material 20 layer 324 and the substrate 322 increases, whereby adhesivity between the substrate 322 and the active material layer 324 becomes high. Thus, the substrate shown in FIGS. 3a and 3b decreases the separation of the active materials from the substrate 322.
FIGS. 4a and 4b show a part of an electrode plate, such as a positive plate or a negative plate, of a nickel/metal hydride secondary battery, according to another embodiment of the present invention. FIG. 4a is a top view of the elecfrode plate of the secondary battery, according to the embodiment of the present invention, and FIG. 4b is a cross-sectional view taken along the line A-A' of FIG. 4a.
Although the elecfrode plate of FIGS. 4a and 4b are similar to that of FIGS. 3a and 3b, it is different in the step number of the stepped cone. That is, in FIGS. 3a and 3b, all the stepped cones of the substrate have three steps, however, in FIGS. 4a and 4b, the three-stepped cone is used, together with the two-stepped cone. As shown in FIGS. 4a and 4b, the substrate is realized in the combination of the three-stepped cone and the two-stepped cone, in which the three-stepped cone functions as a core, whereby the separation of the active material can be further effectively prevented.
[ Industrial Applicability ]
As described hereinbefore, the present invention provides a stepped cone type electrode plate and a nickel/metal hydride secondary battery having the same, in which a substrate of the electrode plate is formed in a stepped cone shape, and thus a horizontal movement of an active material layer attached to the substrate can be restrained. In addition, a contact surface between the active material layer and the substrate increases, whereby adhesivity therebetween becomes high. Therefore, the use of the inventive electrode plate results in reduction of the separation of the active materials from the substrate. Also, in the nickel/metal hydride secondary battery having the electrode plate, the separation of the active material is decreased, thus increasing the stability of the battery.
Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible. For example, the pores of the present invention may be formed in oval, rectangular, polygonal and rhombic shapes, in addition to the circle. Further, as for the stepped cone type electrode plate, the stepped cone may include the combination of a one-stepped cone and a four-stepped cone, as well as only the three-stepped cone or the combination of the three-stepped cone and the two-stepped cone. Furthermore, the stepped cone has the top points formed at not only both sides but also only one side of the substrate. Therefore, it is to be understood that within the scope of the appended claims, the invention may be practiced otherwise than as specifically described.

Claims

What is claimed is:
1. An elecfrode plate of a secondary battery, comprising: a substrate having predetermined pores; and an active material layer coated on both sides of the subsfrate, wherein the substrate includes at least one first stepped cone formed at one side thereof and having a pore at it's top point, and at least one second stepped cone formed . at the other side thereof and having a pore at it's top point, the first stepped cone and the second stepped cone being disposed to be adjacent in at least one direction.
2. The electrode plate as defined in claim 1, wherein the first stepped cone and the second stepped cone are alternately disposed in at least one direction.
3. The electrode plate as defined in claim 1 or 2, wherein the first stepped cone and the second stepped cone have different step numbers.
4. The elecfrode plate as defined in claim 1 or 2, wherein the pores are formed in any shape selected from among circle, oval, rectangle, and rhomboid.
5. The elecfrode plate as defined in claim 1 or 2, wherein the first stepped cone and the second stepped cone have different heights.
6. An electrode plate of a secondary battery, comprising: a substrate having predetermined pores; and an active material layer coated at both sides of the substrate, wherein the substrate has at least one stepped cone.
7. A nickel/metal hydride secondary battery, comprising: a plurality of negative plates each connected to a negative pole; a plurality of positive plates each connected to a positive pole; and . a plurality of separators disposed between the negative plates and the positive plates, wherein the negative plates and/or the positive plates include a subsfrate having predetermined pores, and an active material layer coated on both sides of the subsfrate, in which the subsfrate includes at least one first stepped cone formed at one side thereof and having a pore at it's top point, and a second stepped cone formed at the other side thereof and having a pore at it's top point, the first stepped cone and the second stepped cone being disposed to be adjacent in at least one direction.
8. A nickel/metal hydride secondary battery, comprising: a plurality of negative plates each connected to a negative pole; a plurality of positive plates each connected to a positive pole; and a plurality of separators disposed between the negative plates and the positive plates, wherein the negative plates and/or the positive plates include a subsfrate having predetermined pores, and an active material layer coated on both sides of the subsfrate, in which the substrate has at least one stepped cone.
PCT/KR2003/001611 2003-02-21 2003-08-11 Stair type electrode plate and nickel/metal hydryde secondary battery having the same WO2004077594A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003257715A AU2003257715A1 (en) 2003-02-21 2003-08-11 Stair type electrode plate and nickel/metal hydryde secondary battery having the same

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Application Number Priority Date Filing Date Title
KR10-2003-0011069A KR100489404B1 (en) 2003-02-21 2003-02-21 Stair type electrode plate and nickel/metal hydryde secondary battery having the same
KR10-2003-0011069 2003-02-21

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07130370A (en) * 1993-10-29 1995-05-19 Matsushita Electric Ind Co Ltd Coating type electrode and manufacture thereof
JPH10116621A (en) * 1996-10-09 1998-05-06 Sumitomo Electric Ind Ltd Base of electrode
JP2000113894A (en) * 1998-10-07 2000-04-21 Gs Melcotec Kk Electrode for battery
JP2002015741A (en) * 2000-04-28 2002-01-18 Matsushita Electric Ind Co Ltd Battery electrode plate and its manufacturing method

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07130370A (en) * 1993-10-29 1995-05-19 Matsushita Electric Ind Co Ltd Coating type electrode and manufacture thereof
JPH10116621A (en) * 1996-10-09 1998-05-06 Sumitomo Electric Ind Ltd Base of electrode
JP2000113894A (en) * 1998-10-07 2000-04-21 Gs Melcotec Kk Electrode for battery
JP2002015741A (en) * 2000-04-28 2002-01-18 Matsushita Electric Ind Co Ltd Battery electrode plate and its manufacturing method

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KR20040075533A (en) 2004-08-30
KR100489404B1 (en) 2005-05-12
AU2003257715A1 (en) 2004-09-17

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