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AssigneeSanyo Electric Co., Ltd.
InventorsHiroshi Watanabe, Shiori Nakamizo, Satoshi Narukawa
Estimating the term…
A lithium secondary battery comprises a negative electrode capable of intercalating/deintercalating lithium ion, a positive electrode made of a lithium-containing metal oxide as an active positive material, and a nonaqueous electrolyte, and a polyvinylidene fluoride resin is disposed between said negative electrode and positive electrode so that the battery voltage doesn't rise beyond a predetermined value even when said battery is overcharged.
A lithium secondary battery comprising a negative electrode capable of intercalating/deintercalating lithium ion, a positive electrode made of a lithium-containing metal oxide as an active positive material, and a nonaqueous electrolyte, wherein a polyvinylidene fluoride (PVdF) resin is disposed between said negative electrode and positive electrode so that the battery voltage doesn't rise beyond a predetermined value even when said battery is overcharged.
A battery device comprising a lithium secondary battery and a charging circuit, characterized in that said lithium secondary battery comprises a negative electrode capable of intercalating/deintercalating lithium ion, a positive electrode made of a lithium-containing metal oxide as an active positive material, a nonaqueous electrolyte and a separator comprising a polyvinylidene fluoride for separating said positive electrode and said negative electrode from each other and said charging circuit comprises a charging circuit having no overcharging preventive function so that the battery voltage doesn't rise beyond a predetermined value even when said lithium secondary battery is overcharged.
A battery device comprising a lithium secondary battery and a charging circuit, characterized in that said lithium secondary battery comprises a negative electrode capable of intercalating/deintercalating lithium ion, a positive electrode made of a lithium-containing metal oxide as an active positive material, a nonaqueous electrolyte and a separator comprising a polyvinylidene fluoride for separating said positive electrode and said negative electrode from each other and said charging circuit comprises a charging circuit having an overcharging preventive function so that the battery voltage doesn't rise beyond a predetermined value even when said overcharging preventive function doesn't operate upon overcharging of said lithium secondary battery.
Dependencies are inferred from the claim text.
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Li-accumulators: rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells: safety or regulating additives or arrangements in…
Synthetic resins, e.g. thermoplastics or thermosetting resins: polyolefins
Synthetic resins, e.g. thermoplastics or thermosetting resins: fluorocarbon polymers
Term end not estimated
USPTO file history isn’t available for this patent, so only indexed dates are shown.
1. Field of the Invention
The present invention relates to a lithium secondary battery, for example a lithium secondary battery comprising a negative electrode capable of intercalating/deintercalating lithium ion, a positive electrode made of a lithium-containing metal oxide as an active positive material, a nonaqueous electrolyte and a separator for separating the positive electrode and the negative electrode from each other and a battery device comprising same.
2.Description of the related Art
FIG. 1 is a perspective view diagrammatically illustrating how a positive electrode plate and a negative electrode plate are laminated with a separator provided interposed therebetween.
FIG. 2 is a perspective view diagrammatically illustrating a lithium secondary battery formed by winding the laminate of FIG. 1 and then receiving the laminate thus wound in a laminate outer case.
FIG. 3 is a view diagrammatically illustrating how such a lithium secondary battery received in a battery device for portable telephone is connected to a charger.
An embodiment of implication of the lithium secondary battery and battery device according to the present invention will be described hereinafter in connection with FIGS. 1 to 4. FIG. 1 is a perspective view diagrammatically illustrating how a positive electrode plate and a negative electrode plate are laminated with a separator provided interposed therebetween. FIG. 2 is a perspective view diagrammatically illustrating a lithium secondary battery formed by winding the laminate and then receiving the laminate thus wound in a laminate outer case. FIG. 3 is a view diagrammatically illustrating how such a lithium secondary battery received in a battery device for portable telephone is connected to a charger. FIG. 4 is a view diagrammatically illustrating how a battery pack obtained by adding a protective circuit to such a lithium secondary battery is received in a battery device for portable telephone and connected to a charger.
1. Preparation of Separator
As a reinforcing material there was used a non-woven cloth of polyethylene terephthalate (PET) having a thickness of 30 μm. The non-woven cloth of polyethylene terephthalate (PET) was then impregnated with a polyvinylidene fluoride (PVdF) resin to give an integrated body. Thus, a separator 10 made of composite resin film was prepared. The separator 10 was then used as a separator a in Example 1.