Battery

A battery and positive electrode technology, applied in the field of flat primary batteries, can solve the problems of button-type battery load characteristics and discharge capacity insufficiency, inter-battery capacity changes, gas and internal short circuits, etc., to prevent sudden deterioration and prevent capacity. The effect of reducing and improving productivity

Inactive Publication Date: 2006-05-24
SONY CORP
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Problems solved by technology

Such use has been made because the load characteristics and discharge capacity of button-type batteries in which the reaction area of ​​the electrode is very small cannot meet the needs of the application
[0004] Generally, since welding etc. are required to install the battery into the device, its process steps become very complicated and greatly limit the design of the device
Also, if the number of batteries connected in parallel increases to three or more, problems arise due to variations in capacity among batteries
For example, there may be concerns that a battery whose discharge capacity is smaller than that of other batteries continues to discharge even in a state where discharge is usually completed and causes overdischarge, or that such a battery is charged by another battery and causes gas generation and internal short circuit , which is very dangerous

Method used

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Embodiment 1

[0109] 80.8 mass percent of graphite fluoride as a positive electrode active material and 15.1 mass percent of acetylene black as a conductive material were uniformly mixed and dispersed in ethanol, thereby obtaining a slurry. After that, acetylene black as a binder was mixed in a ratio of 4.1% by mass. In this case, carboxymethylcellulose dissolved in water was mixed as a thickener and the viscosity was adjusted to a predetermined value (200 Pas), thereby obtaining a positive electrode mixture.

[0110] An aluminum foil with 20 μm was used as the positive electrode collector. The positive electrode active material layer was formed by screen printing the positive electrode mixture onto an aluminum foil. The positive electrode formed as described above was dried in a vacuum environment, and thereafter the positive electrode was bent as Figure 12 The W shape shown. Set up the microporous membrane as the separator, thereafter, as in Figure 12 Metal lithium is provided, ther...

example 1-1

[0114] A battery was formed in which the width was equal to 28 mm, the length was equal to 49 mm, the thickness was equal to 1.8 mm and the capacity was equal to 600 mAh.

example 1-2

[0116] A battery was formed in which the width was equal to 15 mm, the length was equal to 60 mm, the thickness was equal to 2.1 mm and the capacity was equal to 400 mAh.

[0117] A button-type battery in the related art was used as a comparative example. The following batteries were used as comparative examples.

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Abstract

PROBLEM TO BE SOLVED: To provide a battery with excellent productivity maintaining a load characteristics by preventing a lowering of contact between a cathode and an anode caused by change of the size of a battery element due to consumption of lithium, maintaining a high discharging capacity even at its terminal stage of discharge in spite of its reduced thickness.

SOLUTION: A cathode activator layer 1a is formed only on one face of a cathode current collector 1b, and the cathode current collector is bent in folded screen shape so that the cathode activator layers face each other. An anode is arranged between the cathode activator layers facing each other through a separator. An electrode terminal is connected to the cathode and anode respectively, and the battery element is sealed under reduced pressure after the battery element is wrapped by a laminate film. Further, the activator layer is not applied on the curved part of the cathode current collector, and the activator is prevented from exfoliation and fall-off by arranging an unpainted area within a prescribed width.

COPYRIGHT: (C)2006,JPO&NCIPI

Description

technical field [0001] The present invention relates to planar primary cells with excellent cell characteristics and productivity. Background technique [0002] Currently, coin type lithium batteries are used as power sources for clocks and memory backup power sources for electronic products such as personal computers, copying equipment, video cameras, game machines, and the like. In addition, application to driving power sources in vending machines, gas meters, smart lock systems, tire pressure monitoring systems, car navigation systems, electronic tag systems, etc. in a wide use temperature range from high temperature to low temperature is also expected. [0003] However, in recent years, a large number of applications have been proposed in which a plurality of coin-type batteries are connected in parallel in order to satisfy the load characteristics and discharge capacity necessary on the equipment side using a coin-type battery, and the shape (thin type) required for the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/06H01M2/02H01M4/64H01M6/16
Inventor 森田浩之
Owner SONY CORP
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