NL2004862C2 - Battery and method of manufacture thereof. - Google Patents

Battery and method of manufacture thereof. Download PDF

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Publication number
NL2004862C2
NL2004862C2 NL2004862A NL2004862A NL2004862C2 NL 2004862 C2 NL2004862 C2 NL 2004862C2 NL 2004862 A NL2004862 A NL 2004862A NL 2004862 A NL2004862 A NL 2004862A NL 2004862 C2 NL2004862 C2 NL 2004862C2
Authority
NL
Netherlands
Prior art keywords
battery
circuit board
housing
opening
casing
Prior art date
Application number
NL2004862A
Other languages
Dutch (nl)
Inventor
Franciscus Guentherus Bernardus Ooms
Daniel Russell Simon
Original Assignee
Nedusa Em
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 Nedusa Em filed Critical Nedusa Em
Priority to NL2004862A priority Critical patent/NL2004862C2/en
Priority to PCT/NL2011/050412 priority patent/WO2011155834A1/en
Application granted granted Critical
Publication of NL2004862C2 publication Critical patent/NL2004862C2/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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
    • H01M50/183—Sealing members
    • H01M50/186—Sealing members characterised by the disposition of the sealing members
    • 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
    • H01M10/04—Construction or manufacture in general
    • H01M10/0436—Small-sized flat cells or batteries for portable equipment
    • 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
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
    • H01M50/116—Primary casings, jackets or wrappings of a single cell or a single battery 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
    • H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
    • H01M50/147—Lids or covers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
    • H01M50/172—Arrangements of electric connectors penetrating the casing
    • H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
    • H01M50/182—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for cells with a collector centrally disposed in the active mass, e.g. Leclanché cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
    • H01M50/183—Sealing members
    • H01M50/19—Sealing members characterised by the material
    • H01M50/193—Organic material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/545—Terminals formed by the casing of the cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/60—Arrangements or processes for filling or topping-up with liquids; Arrangements or processes for draining liquids from casings
    • H01M50/609—Arrangements or processes for filling with liquid, e.g. electrolytes
    • H01M50/627—Filling ports
    • 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
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Description

Battery and method of manufacture thereof
The present invention relates to a battery.
The invention further relates to a method of 5 manufacture of a battery.
The last decade has shown an incredible increase in the use of mobile devices. All these mobile devices need to be powered. The vast majority of mobile devices is powered by rechargeable batteries. The battery usually takes up 10 quite a significant amount of volume and/or mass of the mobile device. The volume and mass of mobile devices is an important issue to the end-user. At the other hand, the volume and mass of a battery limits the amount of energy the battery can store. A lot of research has been devoted to 15 increase the stored energy per volume ratio of batteries.
As mobile devices are still being further reduced in size, and their computational power and therefore energy consumption is still increasing, there still is a demand for batteries with a higher energy volume ratio.
20 The object of the present invention is to provide a battery with an increased stored energy per volume ratio compared to batteries of the prior art.
The present invention provides a battery comprising: a casing enclosing an electrolyte wherein the 25 casing has an opening; a circuit board comprising a battery management circuit; wherein the circuit board is mounted in or on the opening of the casing, closing off the casing and isolating the electrolyte from the surroundings of the battery.
30 Batteries from the prior art comprise a battery casing holding the electrolyte. An additional circuit (a battery management circuit) is provided to provide one or more of the following functions: protecting the battery 2 against excessive voltages, excessive currents and/or excessive temperatures; providing the battery charging algorithm; optimising health and efficiency by controlling the charge cycles; providing data on the battery, such as 5 battery health condition and depth of discharge. In some prior art embodiments the battery management circuit is provided on the main circuit board of the mobile device. In other prior art embodiments the battery management circuit is attached to the exterior of the battery, for example by 10 gluing. Usually some additional packaging is provided around the stack formed the battery and the battery management circuit. This packaging often takes the form of some foil wrap, or a thin plastic case that has been cast around the stack .
15 The present invention requires less volume, for the combination of the battery and the battery management circuit, as the circuit board of the battery management circuit itself functions as part of the casing of the battery. It is the circuit board that prohibits the 20 electrolyte from spilling out of the casing and provides electrical contact to the outside of the casing.
The circuit board is not limited to the classic examples of ceramic based or epoxy resin based printed circuit boards, but also includes insulating foils with 25 printed circuits, such as Kapton®. Depending on the actual shape and construction of the casing and the opening, it suffices in some particular embodiments if the circuit board is just strong enough to prevent ripping or puncturing. In these embodiments structural stiffness is provided by the 30 casing. Furthermore, the circuit board could be a packaged integrated circuit, wherein the package serves as part of the casing of the battery too.
3
In a further embodiment the battery management circuit is mounted on the outer side of the circuit board.
On the outer side, the electronic components of the battery management circuit are protected by the circuit board from 5 being chemically affected by the electrolyte. It also prevents unwanted currents or voltages in the battery management circuit due to any unwanted electrical contact between the components and the electrolyte.
In one embodiment a battery is provided, wherein 10 the circuit board is attached in or on the opening of the casing by means of a resin.
In an alternative embodiment a battery is provided, wherein the circuit board is attached in or on the opening of the casing by means of welding.
15 Specifically when a fluid electrolyte is used, the means of attaching the circuit board to the casing should seal off the opening in order to prevent spilling of electrolyte .
In a further embodiment the present invention 20 provides a battery, wherein the circuit board comprises electronic components and an external terminal, and wherein the electronic components are covered by resin and the external terminal is protruding out of the resin. The electronic components are protected by the layer of resin.
25 As the terminal protrudes out of the resin, it is still possible to make electrical contact with the terminal. In particular embodiments, terminals may provide functions such as positive or negative charge or drain terminal, common charge/drain terminal, data terminal for providing charged 30 capacity information, cycle counter information, battery temperature, and battery condition. Furthermore, in a specific embodiment bypass terminals are provided that connect straight to the anode and cathode of the cell, 4 bypassing the the battery management circuit. This way a system designer may decide to employ a battery management circuit of his own choosing.
In a further embodiment, the invention provides a 5 battery, wherein the circuit board further comprises a through-hole for releasing a fluid from the battery. Specifically for batteries where gas might be released, for example during overcharging, the through-hole acts as on overpressure release as an added security measure if the 10 overcharging protection of the battery management circuit fails. Additionally, the through-hole may serve for filling the battery with the electrolyte.
In a preferred embodiment, a battery is provided, wherein the circuit board comprises an electrode on its 15 inner side. The electrode serves as one of the two electrodes of the electrochemical cell.
In a specific further embodiment, the invention provides a battery, wherein the electrode comprised on the circuit board comprises the anode. In an alternative 20 embodiment, the electrode comprises the cathode.
The present invention also provides a battery, wherein the electrode comprised on the circuit board is connected with a conductor on the outer side of the circuit-board by means of a through-hole in the circuit board 25 comprising an electrical conductor. The through-hole with the electrical conductor provides electrical contact between one of the electrodes of the cell, and the battery management circuit on the circuit board. In one specific embodiment, the through-hole is a metallised through-hole.
30 In another preferred embodiment, a battery is provided, wherein the casing forms a first electrode of the battery. Furthermore, the casing is connected to a terminal on the circuit board, to connect the battery management 5 circuit with the second pole of the cell. This connection might in one embodiment be a soldered connection, or in an alternative embodiment a conductive resilient contact, such as a spring contact.
5 In an alternative embodiment, the casing does not have a double function as an electrode, but an additional electrode is provided in the battery, for example as a second electrode provided on the circuit board. This is specifically advantageous if the electrode is subjected to 10 chemical decomposition due to the chemo-electrical reactions going on in the cell. However, if the electrode is not subjected to decomposition, the above mentioned embodiment where the casing serves as a electrode is advantageous due to the reduced volume and/or mass of the battery.
15 In a further embodiment, a battery is provided, wherein the casing forms the cathode of the battery. In an alternative embodiment, the casing forms the anode of the battery.
The present invention also provides a method of 20 manufacturing a battery comprising the steps of: - providing a casing with an opening; - filling the casing with an electrolyte; - providing a circuit board comprising a battery management circuit; and - mounting the circuit board in or on the opening such that the opening is closed off.
25 Furthermore, the present invention provides a method, wherein the circuit board comprises a through-hole, and wherein the step of filling the casing with an electrolyte comprises injecting the electrolyte into the casing through the through-hole in the circuit board.
30 Further advantages and additional embodiments will be described below with reference to the accompanying figures, wherein: 6
Figure 1 shows a schematic sectional drawing of a battery according to the present invention.
A battery 100 (figure 1) comprises a casing 110 that is filled with electrolyte 120. The casing is made of 5 metal and forms the cathode of the cell. The casing 110 is open at the top side. A circuit board 130 is inserted into the opening to close off the opening. A resin layer 140 is used to fix the circuit board 130 in the opening of the casing 110. The circuit board 130 comprises electrical 10 components 132a, 132b, including an integrated circuit 132a that implements a battery management circuit to control the charging process and to protect the battery against excessive voltage, excessive current, and excessive temperatures. To that extend, the integrated circuit 132a 15 comprises a temperature sensor.
The circuit board 130 further comprises a metallised through-hole 136a, the metal in the through-hole forming a conductor that electrically connects an anode electrode 134 of the cell at the inner side of the circuit 20 board 130 to the printed circuit (not shown) at the outer side of the circuit board 130.
A spring contact 139 engages with the inside of the metal casing 110, in order to electrically connect the circuit board 130 to the cathode electrode of the cell.
25 External terminals 138a-c extend out of the resin 140 from the circuit board 130, and provide a positive contact 138a and negative contact 138b for charging the battery and draining the battery, and a data contact 138c for providing information such as a cycle counter and depth 30 of discharge.
It should be noted that the embodiments shown in the figure and described above are exemplary embodiments and should not be regarded as limiting. It is clear to the person skilled 7 in the art that the features of the above described embodiments, as far as they are not specifically described as alternatives, can be combined into further embodiments according to the present invention. Furthermore, the person 5 skilled in the art will foresee several modifications and adaptations within the scope of the present invention. The protection sought is therefore only limited by the following 8
Embodiment s 1. Battery comprising: a casing enclosing an electrolyte, wherein the 5 casing has an opening; a circuit board comprising a battery management circuit; wherein the circuit board is mounted in or on the opening of the casing, closing off the casing and isolating 10 the electrolyte.
2. Battery according to claim 1, wherein the battery management circuit is mounted on the outer side of the circuit board.
15 3. Battery according to claim 1 or 2, wherein the circuit board is attached in or on the opening of the casing by means of a resin.
20 4. Battery according to claim 1 or 2, wherein the circuit board is attached in or on the opening of the casing by means of welding.
5. Battery according to claim 2, 3, or 4, wherein 25 the circuit board comprises electronic components and an external terminal, and wherein the electronic components are covered by resin and the external terminal is protruding out of the resin.
30 6. Battery according to any of claims 1-5, wherein the circuit board further comprises a through-hole for releasing a fluid from the battery.
9 7. Battery according to any of claims 1-6, wherein the circuit board comprises an electrode on its inner side.
8. Battery according to claim 7, wherein the 5 electrode comprised on the circuit board comprises the anode .
9. Battery according to claim 7 or 8, wherein the electrode comprised on the circuit board is connected with a 10 conductor on the outer side of the circuit board by means of a through-hole in the circuit board comprising an electrical conductor .
10. Battery according to any of claims 1-9, wherein 15 the casing forms a first electrode of the battery.
11. Battery according to claim 10, wherein the casing forms the cathode of the battery.
20 12. Method of manufacturing a battery comprising the steps of: - providing a casing with an opening; - filling the casing with an electrolyte; - providing a circuit board comprising a battery 25 management circuit; and - mounting the circuit board in or on the opening such that the opening is closed off.
13. Method according to claim 12, wherein the 30 circuit board comprises an through-hole, and wherein the step of filling the casing with an electrolyte comprises injecting the electrolyte into the casing through the through-hole in the circuit board.

Claims (13)

1. Accu omvattende een behuizing die een elektrolyt omhult, waarbij de behuizing een opening heeft; 5 een schakelingsbord omvattende een accubeheersingsschakeling; waarbij het schakelingsbord bevestigd is in of op de opening van de behuizing, de behuizing afsluitende en het elektrolyt isolerende.A battery comprising a housing enclosing an electrolyte, the housing having an opening; 5 a circuit board comprising a battery control circuit; wherein the circuit board is mounted in or on the opening of the housing, sealing the housing and insulating the electrolyte. 2. Accu volgens conclusie 1, waarbij de accubeheersingsschakeling aan de buitenzijde van het schakelingsbord aangebracht is.The battery according to claim 1, wherein the battery control circuit is arranged on the outside of the circuit board. 3. Accu volgens conclusie 1 of 2, waarbij het schakelingsbord door middel van een hars in of op de opening van de behuizing bevestigd is.3. Battery according to claim 1 or 2, wherein the circuit board is mounted in or on the opening of the housing by means of a resin. 4. Accu volgens conclusie 1 of 2, waarbij het 20 schakelingsbord door middel van lassen in of op de opening in de behuizing bevestigd is.4. Battery as claimed in claim 1 or 2, wherein the circuit board is fixed by welding in or on the opening in the housing. 5. Accu volgens conclusie 2, 3 of 4, waarbij het schakelingsbord elektronische componenten omvat en een 25 externe klem, en waarbij de elektronische componenten bedekt zijn door hars en waarbij de externe klem uit het hars steekt.5. Battery as claimed in claim 2, 3 or 4, wherein the circuit board comprises electronic components and an external clamp, and wherein the electronic components are covered by resin and wherein the external clamp protrudes from the resin. 6. Accu volgens een van de conclusies 1-5, waarbij 30 het schakelingsbord verder een doorboring omvat voor het vrij laten komen van een fluïdum uit de accu.6. Battery according to any of claims 1-5, wherein the circuit board further comprises a bore for releasing a fluid from the battery. 7. Accu volgens een van de conclusies 1-6, waarbij het schakelingsbord aan zijn binnenste zijde een elektrode omvat.The battery according to any of claims 1-6, wherein the circuit board comprises an electrode on its inner side. 8. Accu volgens conclusie 7, waarbij de elektrode dat door het schakelingsbord omvat wordt, een anode omvat.The battery of claim 7, wherein the electrode included in the circuit board comprises an anode. 9. Accu volgens conclusie 7 of 8, waarbij de elektrode die omvat is door het schakelingsbord verbonden is 10 met een geleider aan de buitenzijde van het schakelingsbord door middel van een doorboring in het schakelingsbord die een elektrische geleider omvat.9. Battery according to claim 7 or 8, wherein the electrode which is included by the circuit board is connected to a conductor on the outside of the circuit board by means of a bore in the circuit board which comprises an electrical conductor. 10. Accu volgens een van de conclusies 1-9, 15 waarbij de behuizing een elektrode van de accu vormt.10. Battery according to any of claims 1-9, 15, wherein the housing forms an electrode of the battery. 11. Accu volgens conclusie 10, waarbij de behuizing de kathode van de accu vormt.The battery of claim 10, wherein the housing forms the cathode of the battery. 12. Werkwijze voor het fabriceren van een accu omvattende stappen van: het verschaffen van een behuizing met een opening; het vullen van de behuizing met een elektrolyt; het verschaffen van een schakelingsbord omvattende 25 een accubeheersingsschakeling; en het bevestigingen van het schakelingsbord in of op de opening zodat de opening afgesloten is.A method of manufacturing a battery comprising the steps of: providing a housing with an opening; filling the housing with an electrolyte; providing a circuit board comprising a battery control circuit; and mounting the circuit board in or on the opening so that the opening is closed. 13. Werkwijze volgens conclusie 12, waarbij het 30 schakelingsbord een doorboring omvat, en waarbij de stappen voor het vullen van de behuizing met een elektrolyt het injecteren van het elektrolyt in de behuizing door de doorboring in het schakelingsbord omvat.13. Method as claimed in claim 12, wherein the circuit board comprises a bore, and wherein the steps for filling the housing with an electrolyte comprises injecting the electrolyte into the housing through the bore in the circuit board.
NL2004862A 2010-06-09 2010-06-09 Battery and method of manufacture thereof. NL2004862C2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
NL2004862A NL2004862C2 (en) 2010-06-09 2010-06-09 Battery and method of manufacture thereof.
PCT/NL2011/050412 WO2011155834A1 (en) 2010-06-09 2011-06-08 Battery and method of manufacture thereof

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL2004862A NL2004862C2 (en) 2010-06-09 2010-06-09 Battery and method of manufacture thereof.
NL2004862 2010-06-09

Publications (1)

Publication Number Publication Date
NL2004862C2 true NL2004862C2 (en) 2011-12-13

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Family Applications (1)

Application Number Title Priority Date Filing Date
NL2004862A NL2004862C2 (en) 2010-06-09 2010-06-09 Battery and method of manufacture thereof.

Country Status (2)

Country Link
NL (1) NL2004862C2 (en)
WO (1) WO2011155834A1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6319631B1 (en) * 1999-09-08 2001-11-20 Motorola, Inc. Contact system for interconnection of substrate and battery cell
US6524732B1 (en) * 1999-03-30 2003-02-25 Matsushita Electric Industrial Co., Ltd. Rechargeable battery with protective circuit
US20050266279A1 (en) * 2004-05-31 2005-12-01 Kim Jun H Rechargeable battery
US20080171235A1 (en) * 2007-01-17 2008-07-17 Kyungwon Seo Rechargeable battery

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6524732B1 (en) * 1999-03-30 2003-02-25 Matsushita Electric Industrial Co., Ltd. Rechargeable battery with protective circuit
US6319631B1 (en) * 1999-09-08 2001-11-20 Motorola, Inc. Contact system for interconnection of substrate and battery cell
US20050266279A1 (en) * 2004-05-31 2005-12-01 Kim Jun H Rechargeable battery
US20080171235A1 (en) * 2007-01-17 2008-07-17 Kyungwon Seo Rechargeable battery

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