WO2009048199A1 - Metal case for batteries - Google Patents

Metal case for batteries Download PDF

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Publication number
WO2009048199A1
WO2009048199A1 PCT/KR2007/006247 KR2007006247W WO2009048199A1 WO 2009048199 A1 WO2009048199 A1 WO 2009048199A1 KR 2007006247 W KR2007006247 W KR 2007006247W WO 2009048199 A1 WO2009048199 A1 WO 2009048199A1
Authority
WO
WIPO (PCT)
Prior art keywords
casing
electrode
batteries
battery
central portion
Prior art date
Application number
PCT/KR2007/006247
Other languages
French (fr)
Inventor
Yong-Wook Lee
Du-Wan Ko
Original Assignee
Smart Thinkers, Inc.
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 Smart Thinkers, Inc. filed Critical Smart Thinkers, Inc.
Publication of WO2009048199A1 publication Critical patent/WO2009048199A1/en

Links

Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01GCAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
    • H01G11/00Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/78Cases; Housings; Encapsulations; Mountings
    • H01G11/80Gaskets; Sealings
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10Primary casings, jackets or wrappings of a single cell or a single battery
    • H01M50/102Primary casings, jackets or wrappings of a single cell or a single battery characterised by their shape or physical structure
    • H01M50/109Primary casings, jackets or wrappings of a single cell or a single battery characterised by their shape or physical structure of button or coin shape
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01GCAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
    • H01G9/00Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
    • H01G9/004Details
    • H01G9/08Housing; Encapsulation
    • H01G9/10Sealing, e.g. of lead-in wires
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204Racks, modules or packs for multiple batteries or multiple cells
    • H01M50/207Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
    • H01M50/216Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for button or coin cells
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

Disclosed herein is a metal casing for batteries. The metal casing includes a ring-shaped gasket, an upper casing and a lower casing, and an anode electrode and a cathode electrode. The ring-shaped gasket is provided to prevent internal reaction material from leaking. The upper and lower casings are coupled together and are insulated from each other via the gasket. The anode and cathode electrodes are provided on the upper and lower casings. At least one of the upper casing and the lower casing includes a protruding central portion and a stepped edge portion, heights of which are different from each other due to a step that is formed at the bottom of the corresponding casing. The electrode, which is provided on the casing having the step, has a thickness equal to or less than the protrusion height of the central portion, and is bonded to the edge portion.

Description

Description
METAL CASE FOR BATTERIES
Technical Field
[1] The present invention relates, in general, to a metal casing for batteries and, more particularly, to a metal casing that is used to cover various types of batteries, such as a primary battery, a secondary battery or an electric double layer capacitor.
[2]
Background Art
[3] Generally, a metal casing, which is used for various types of batteries, includes an upper casing and a lower casing, which are coupled together and insulated from each other via a gasket, thus forming a battery casing, and an anode electrode and a cathode electrode, which are configured so as to come into contact with the upper casing and the lower casing, respectively.
[4] FIG. 1 shows a unit cell that constitutes a conventional electric double layer capacitor. The unit cell is indicated by reference numeral 1. The unit cell includes two polarized electrodes 2 and 3 into which electrolytic solution is impregnated, an insulating separator 4 which is material having an ion exchange characteristic and is disposed between the two electrodes 2 and 3, a gasket 5 which is disposed around the two electrodes 2 and 3 to thus prevent the electrolytic solution from leaking, and upper and lower casings 6 and 7 which are configured such that the elements 2, 3, 4 and 5 are mounted therein and the upper and lower casings 6 and 7 are insulated from each other via the gasket 5, thus constituting a casing body, and which are made of metal material.
[5] The unit cell 1 may be used singly or may be configured such that two or more unit cells are arranged in the upper and lower directions thereof. As shown in FIGS. 2 to 4, an anode electrode 8 and a cathode electrode 9 are bonded with the respective upper and lower casings 6 and 7, and thus a usable electric double layer capacitor is constructed. As shown in the drawings, the coupling between the upper and lower casings 6 and 7 and the electrodes 8 and 9 are made in a simple surface contact manner using a method such as welding.
[6] Here, although, as an example, the electric double layer capacitor, including internal ionic exchange material, has been described as a battery, primary batteries or secondary batteries, which use internal chemical reaction material instead of the ion exchange material, may have the same construction as the electric double layer capacitor, except for the reaction material in the battery.
[7] Meanwhile, in accordance with the recent trend toward small-sized and slim electronic devices, it is essential to make the components of the devices slim, including batteries used for the devices. However, referring to FIG. 5, in the conventional capacitor, the thicknesses d2 and d3 of the respective electrodes 8 and 9 are related to the total thickness d of the capacitor, in addition to the thickness dl of the unit cell 1. This unnecessarily increases the thickness of the capacitor and, as a result, causes a problem in which the range of use of the capacitor is limited.
[8] When the total thickness of the capacitor must be reduced, a method of decreasing the thickness dl of the unit cell 1 is used to achieve this in practice. However, in this case, the electrodes 2 and 3 become relatively thinner and thus the size of the capacitor is reduced, but, as a result, a problem occurs in that the capacitance of the capacitor itself is lowered.
[9] Furthermore, problems, such as deformation and separation, occur because the structural strength of the capacitor is lowered. In particular, the possibility of separation between the upper and lower casings and the electrodes is high, and these two types of elements are coupled in a simple surface contact manner, so that, when they are handled or mounted, a problem occurs in that the casings and the electrodes may be easily separated from each other if a small amount of impact is applied thereto, in particular, if a lateral impact is applied thereto.
[10] The above-described problems of the conventional electric double layer capacitor are caused by the structure thereof, rather than by the internal reaction material, and also apply to primary batteries or secondary batteries in the same manner as in the electric double layer capacitor.
[H]
Disclosure of Invention
Technical Problem
[12] Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and the present invention is intended to provide a metal casing for batteries, which enables the realization of a thinner battery. [13] Furthermore, the present invention is intended to provide a metal casing for batteries, which enables the realization of a thinner battery without reducing the capacity of the battery. [14] Furthermore, the present invention is intended to provide a metal casing for batteries, which can stably maintain both the state of a battery and the coupling between upper and lower casings and electrodes. [15]
Technical Solution [16] The present invention provides a metal casing for batteries, including: a ring-shaped gasket, which is provided to prevent internal reaction material from leaking; an upper casing and a lower casing, which are coupled together and are insulated from each other via the gasket; and an anode electrode and a cathode electrode, which are provided on the upper and lower casings, wherein at least one of the upper casing and the lower casing comprises a protruding central portion and a stepped edge portion, heights of which are different from each other due to a step that is formed at the bottom of the corresponding casing, and an electrode, which is provided on the casing having the step, has a thickness equal to or less than the protrusion height of the central portion, and is bonded to the edge portion.
[17] Furthermore, the step is formed in a portion in which the inner surface of the lower casing and the edge of the electrode come into contact with each other. It is preferred that the electrode be formed to surround the protruding central portion.
[18]
Advantageous Effects
[19] The electrodes, which are limitedly bonded to the stepped edge portion, have no relationship to the total thickness of the battery. Accordingly, in the present invention, the battery can be thinner than a conventional battery. Furthermore, in the structure of the present invention, the location of the step to be formed is appropriately adjusted, so that the battery of the present invention can be configured to have the same capacitance as a conventional battery. That is, according to the present invention, a design can be achieved such that the battery of the present invention is thinner than a conventional battery but the same capacitance is maintained.
[20] Meanwhile, at least one of the electrodes is formed to surround the protruding central portions of the casing, so that the secure coupling with the casing can be maintained. Furthermore, the casing, including the step, is bent, so that the shape of the battery can be reliably maintained.
[21]
Brief Description of the Drawings
[22] 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:
[23] FIG. 1 is a sectional view of a unit cell that constitutes a conventional electric double layer capacitor;
[24] FIG. 2 is a plan view of the electric double layer capacitor, which includes the unit cell of FIG. 1;
[25] FIG. 3 is a front view of FIG. 2;
[26] FIG. 4 is a bottom view of FIG. 2;
[27] FIG. 5 is a partially enlarged view of the 'A' portion of FIG. 3; [28] FIG. 6 is a sectional view of a unit cell that constitutes an electric double layer capacitor according to the present invention;
[29] FIG. 7 is a plan view of the electric double layer capacitor, which includes the unit cell of FIG. 6;
[30] FIG. 8 is a front view of FIG. 7 ;
[31] FIG. 9 is a bottom view of FIG. 7 ; and
[32] FIG. 10 is a partially enlarged view of the 'B' portion of FIG 8.
[33]
Best Mode for Carrying Out the Invention
[34] The term 'battery', used in the present invention, includes various types of batteries, such as a primary battery, a secondary battery and an Electric Double Layer Capacitor(EDLC). For ease of description, the present invention is described with reference to an EDLC, which is a kind of battery. Furthermore, the same reference numerals are used for the same or similar elements as those of the conventional EDLC.
[35] FIG. 6 shows the unit cell of an EDLC, including a metal casing according to the present invention. The unit cell is indicated by reference numeral 11. The unit cell includes two polarized electrodes 2 and 3 into which an electrolytic solution is impregnated, an insulating separator 4 which is material having an ion exchange characteristic and is disposed between the two electrodes 2 and 3, a gasket 5 which is disposed around the two electrodes 2 and 3 to thus prevent the electrolytic solution from leaking, and upper and lower casings 12 and 13 which are configured such that the elements 2, 3, 4 and 5 are mounted therein and the upper and lower casings 12 and 13 are insulated from each other via the gasket 5, thus constituting a casing body, and which are made of metal material.
[36] The unit cell 11 may be used singly, or may be configured such that two or more unit cells are arranged in the upper and lower direction thereof. As shown in FIGS. 7 to 9, an anode (+) electrode 14 and a cathode (-) electrode 15 are bonded with the respective upper and lower casings 12 and 13, and thus a usable EDLC is constructed.
[37] In order to prevent internal reaction material from leaking, the metal casing of the present invention includes a ring-shaped gasket 5, which is provided so as to adhere closely to the inner wall of the lower casing 13, the upper and lower casings 12 and 13, which are coupled to be insulated from each other via the gasket 5, thus constituting a casing body for the EDLC, and the anode and cathode electrodes 14 and 15, which are provided so as to come into contact with the respective surfaces of the upper and lower casings 12 and 13.
[38] Referring to FIG. 6, the bottom of the lower casing 13 includes a protruding central portion 17 and a stepped edge portion 18, heights of which are different from each other due to the step lβthat is formed for that purpose. Referring to FIG. 8, the thickness of the cathode electrode 15, which is bonded to the lower casing 13, is equal to or less than the protrusion height of the central portion 17, and this cathode electrode 15 is limitedly bonded to an outer surface of the edge portion 18. In this case, it is preferred that the cathode electrode 15 be formed so as to surround the protruding central portion 17.
[39] Due to the above-described construction, the cathode electrode 15 has no relationship with the thickness of the EDLC, thus reducing the thickness of the EDLC compared with a conventional EDLC. Referring to FIG. 10, if a design is made such that, for example, the thickness of the unit cell 11, including the protruding central portion 17, is set to "dl" the anode thickness of the anode electrode 12 is set to "d2", and the thickness of the cathode electrode 13 is set to "d3" the total thickness D of the EDLC equals
[40] "dl+d2", ignoring "d3".
[41] As described above, the step 16 advantageously affects the thickness of the EDLC, and the size of the electrode 3, which is mounted in the unit cell 11, is changed according to the location at which the step 16 is formed, and thus the capacitance of the EDLC varies. Accordingly, it is necessary to reduce the thickness of the EDLC and, at the same time, maintain an appropriate capacitance. In order to realize an electrode 3 having a size at which appropriate capacitance is maintained, the step 16 is formed in a portion in which the inner surface of the lower casing 13 and a corner portion of the electrode 3 come into contact with each other. Accordingly, the capacitance of the electrode 3 can be maintained unchanged regardless of the size thereof.
[42] The step 16 is formed to be inclined at a predetermined angle θl, preferably, at an angle of 10 ~ 60°. In particular, the presence and inclination of the step 16 enables the lower casing 13 in the unit cell 11 to be prevented from being bent or deformed when coupling with the upper casing 12 is achieved by curling the upper end of the sidewall of the lower casing 13 or when other impacts are applied thereto. Inclining the sidewall of the lower casing 13 at a predetermined angle Θ2, preferably, at an angle of 1 ~ 25°in the inward direction thereof, and inclining the curled portion of the upper end of the sidewall at a predetermined angle Θ3, preferably, at an angle of 1 ~ 45°in the upward direction thereof, is helpful in increasing the safety and stability of the unit cell 11 and the upper and lower casings 12 and 13.
[43] Referring to FIG. 9, the cathode electrode 15 is limitedly bonded to the surface of the edge portion 18 of the lower casing 13. In this case, it is preferred that the cathode electrode 15 be formed to surround the protruding central portion 17. Accordingly, the cathode electrode 15 holds the lower casing 13 that is located inside the cathode electrode 15, thus increasing safety and resistance to external impact. In addition, the location of the cathode electrode 15 with respect to the lower casing 13 is adjusted, and thus there is an advantage in that a boding process, such as welding, can be easily performed. Here, the term 'surrounding' does not necessarily mean the form of being closed, as shown in the drawings, and includes the form of being open on one side.
[44] In the above-described embodiment, an example in which the thickness of the cathode electrode 15, which is bonded to the lower casing 13, has no relationship with the total thickness of the EDLC when reducing the thickness of the EDLC has been described. Here, it should be noted that the thickness of the anode electrode 14, which is bonded to the upper casing 12, may have no relationship with the thickness of the EDLC, or that neither of the electrodes 14 and 15 may have any relationship with the thickness of the EDLC, in the same manner.
[45] Although, as an example, the EDLC, including internal ionic exchange material, has been described as a battery, primary batteries or secondary batteries, which use internal chemical reaction material instead of the ion exchange material, may have the same construction as the electric double layer capacitor, except for the reaction material in the battery. Accordingly, the present inventionmay be applied to the primary batteries or the secondary batteries in the same manner.
[46]
Industrial Applicability
[47] The electrodes, which are limitedly bonded to the stepped edge portion, have no relationship to the total thickness of the battery. Accordingly, in the present invention, the battery can be thinner than a conventional battery. Furthermore, in the structure of the present invention, the location of the step to be formed is appropriately adjusted, so that the battery of the present invention can be configured to have the same capacitance as a conventional battery. That is, according to the present invention, a design can be achieved such that the battery of the present invention is thinner than a conventional battery but the same capacitance is maintained.
[48] Meanwhile, at least one of the electrodes is formed to surround the protruding central portions of the casing, so that the secure coupling with the casing can be maintained. Furthermore, the casing, including the step, is bent, so that the shape of the battery can be reliably maintained.
[49] Although the preferred embodiment of the present invention has been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.

Claims

Claims
[1] A metal casing for batteries, comprising: a ring-shaped gasket, which is provided to prevent internal reaction material from leaking; an upper casing and a lower casing, which are coupled together and are insulated from each other via the gasket; and an anode electrode and a cathode electrode, which are provided on the upper and lower casings, wherein at least one of the upper casing and the lower casing comprises a protruding central portion and a stepped edge portion, heights of which are different from each other due to a step that is formed at a bottom of the corresponding casing, and an electrode, which is provided on the casing having the step, has a thickness equal to or less than a protrusion height of the central portion, and is bonded to the edge portion.
[2] The metal casing according to claim 1, wherein the step is formed in a portion in which an inner surface of the lower casing and an edge of the electrode come into contact with each other.
[3] The metal casing according to claim 1, wherein the electrode is formed to surround the protruding central portion in a closed manner or in a one- side opened manner.
[4] The metal casing according to claim 1, wherein the step is inclined at a predetermined angle.
[5] The metal casing according to claim 1, wherein the sidewall of the lower casing is formed to be inclined inwards.
PCT/KR2007/006247 2007-10-12 2007-12-04 Metal case for batteries WO2009048199A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2007-0102861 2007-10-12
KR1020070102861A KR100834775B1 (en) 2007-10-12 2007-10-12 Metal case for batteries

Publications (1)

Publication Number Publication Date
WO2009048199A1 true WO2009048199A1 (en) 2009-04-16

Family

ID=39769885

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2007/006247 WO2009048199A1 (en) 2007-10-12 2007-12-04 Metal case for batteries

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KR (1) KR100834775B1 (en)
WO (1) WO2009048199A1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5536596A (en) * 1995-10-16 1996-07-16 Micron Communications, Inc. Method of forming a button-type battery and button-type battery
US5952121A (en) * 1994-03-02 1999-09-14 Micron Communications, Inc. Button-type battery with improved separator and gasket construction
US6358645B1 (en) * 1997-09-30 2002-03-19 Sony Corporation Non-aqueous electrolyte secondary battery
US6365298B2 (en) * 1995-02-22 2002-04-02 Micron Technology, Inc. Thin profile batteries

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3548960B2 (en) * 2001-08-10 2004-08-04 川崎重工業株式会社 Waste glass bottle dispenser

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5952121A (en) * 1994-03-02 1999-09-14 Micron Communications, Inc. Button-type battery with improved separator and gasket construction
US6365298B2 (en) * 1995-02-22 2002-04-02 Micron Technology, Inc. Thin profile batteries
US5536596A (en) * 1995-10-16 1996-07-16 Micron Communications, Inc. Method of forming a button-type battery and button-type battery
US6358645B1 (en) * 1997-09-30 2002-03-19 Sony Corporation Non-aqueous electrolyte secondary battery

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