Rechargeable battery with electrolyte injection opening sealing member
a technology of electrolyte injection and sealing member, which is applied in the direction of batteries, wound/folded electrode electrodes, cell components, etc., can solve the problems of deteriorating welds, difficult to securely weld electrolyte sealing members onto the cap plate, and poor irradiation of lasers used for welding, etc., to improve the structure of electrolyte injection opening and sealing structure.
Inactive Publication Date: 2010-12-30
SAMSUNG SDI CO LTD
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AI Technical Summary
Benefits of technology
The improved sealing structure enhances the reliability of rechargeable batteries by preventing electrolyte leakage and simplifying the fabrication process, making them suitable for high-power applications such as hybrid electric vehicles.
Problems solved by technology
However, when the spherical electrolyte sealing member seals the electrolyte injection opening, as used in conventional rechargeable batteries, it is difficult to securely weld the electrolyte sealing member onto the cap plate because the upper surface of the electrolyte sealing member may not form an exact circle.
Further, when the electrolyte sealing member is inserted into the electrolyte injection opening and welded thereto, a portion between the electrolyte injection opening and the electrolyte sealing member may be smeared with electrolyte solution, thus deteriorating the weld.
Poor welding may allow the electrolyte solution to leak out along the electrolyte injection opening causing a short-circuit.
Method used
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[0038]Referring to FIG. 1, a rechargeable battery 100 includes an electrode assembly 10 having a positive electrode 11 and a negative electrode 12 with a separator 13 interposed between them, a prismatic case 14 for housing the electrode assembly 10, a cap assembly 30 mounted on an opening of the case 14 and sealing the case 14, and a positive terminal 31 and a negative terminal 32 which are electrically connected to the positive electrode 11 and the negative electrode 12, respectively, through tabs 15. The positive and negative electrode taps protrude to the outside of the cap assembly 30.
[0039]The cap assembly 30 includes a safety vent 20 for exhausting gas generated by the rechargeable battery 100, an electrolyte injection opening 34 through which electrolyte solution is injected into the case 14, and an electrolyte sealing member 40 for sealing the electrolyte injection opening 34 to seal the case 14. The electrolyte injection opening 34 may be formed at one side of the cap asse...
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A rechargeable battery having an electrolyte sealing member covering and sealing the electrolyte injection opening. An electrode assembly includes a positive electrode, a negative electrode and a separator wound in a jelly roll configuration. A case houses the electrode assembly. A cap assembly is combined with the case to seal the case, the cap assembly including a positive terminal connected to the positive electrode and a negative terminal connected to the negative electrode. An electrolyte injection opening is formed on the case or the cap assembly. A groove is formed along a periphery of the electrolyte injection opening. An electrolyte sealing member engages the groove.
Description
CROSS-REFERENCE TO RELATED APPLICATION[0001]This application is a continuation of U.S. patent application Ser. No. 11 / 434,637, filed May 15, 2006, which claims priority to and the benefit of Korean Patent Application No. 10-2005-0040590, filed May 16, 2005, the entire content of both of which is incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a rechargeable battery. More particularly, the present invention relates to a rechargeable battery with an improved sealing structure of an electrolyte injection opening.[0004]2. Description of the Related Art[0005]Distinct from a primary battery, a secondary (rechargeable) battery can be repeatedly charged and discharged. Recently, researchers are developing high-power rechargeable batteries using non-aqueous electrolyte which has a high energy density.[0006]Low-capacity batteries having a single battery pack are used as a power source for various portable electr...
Claims
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IPC IPC(8): H01M2/04H01M50/627H01M50/636
CPCH01M2/0486H01M2/1241H01M10/04H01M2/365H01M2/368H01M2/361Y02E60/10H01M50/3425H01M50/636Y02P70/50H01M50/627H01M50/183H01M50/60H01M50/20H01M10/0431H01M2220/20
InventorKIM, YONG-SAMKIM, KI-HOLIM, HONG-SUPLEE
OwnerSAMSUNG SDI CO LTD