Secondary battery

A secondary battery and positive electrode current collector technology, which is applied in the direction of secondary batteries, secondary battery manufacturing, battery electrodes, etc., can solve the problems of large hysteresis, battery discharge voltage drop, and low energy efficiency, so as to prevent short circuits and prevent The effect of contact, high capacity

Inactive Publication Date: 2006-07-12
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when such a carbon material is used, the negative electrode has a discharge voltage of 0.8 V to 1.0 V with respect to lithium, and when the battery includes the carbon material, the discharge voltage of the battery drops, so a significant improvement in the energy density of the battery can hardly be expected. Improve
In addition, there is also the disadvantage of large hysteresis in the shape of the charge-discharge curve, so energy efficiency is low in each charge-discharge cycle

Method used

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Experimental program
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Effect test

no. 1 approach

[0047] figure 1 A cross-sectional view of the secondary battery according to the first embodiment of the present invention is shown. This secondary battery is a so-called cylindrical battery, and includes a spirally wound body 20 in a substantially hollow cylindrical battery case 11 . The battery case 11 is made of, for example, iron (Fe) plated with nickel (Ni). One end of the battery is partially closed and the other end is partially open. In the battery case 11 , a pair of insulating plates 12 and 13 are arranged such that the spirally wound body 20 is sandwiched therebetween in a direction perpendicular to the peripheral winding surface.

[0048] In the open end portion of the battery case 11, a battery cover 14, a safety valve mechanism 15 and a positive temperature coefficient device (PTC device) 16 arranged inside the battery cover 14 are installed by caulking through a gasket 17, and the inside of the battery case 11 is sealed. . The battery cover 14 is made of, fo...

no. 2 approach

[0086] Image 6 A cross-sectional view of a spirally wound body 20 according to a second embodiment of the present invention is shown. The spirally wound body 20 has the same structure as that of the first embodiment, except that the exposed positive electrode region 21D is included in the outer end portion 22B1 at a position opposite to the outer end portion 22B1 of the negative electrode active material layer 22B. Except for the protective element 30 on the inner side of the region 21D, and the spirally wound body 20 can be formed in the same manner. Therefore, the same components are denoted by the same numerals as in the first embodiment. Image 6 Diaphragm 23 is not shown.

[0087] In this embodiment, as described above, the exposed positive electrode region 21D includes on the inner side of the exposed positive electrode region 21D at a position opposite to the outer end portion 22B1 of the negative electrode active material layer 22B in the outer end portion 22B1. Pr...

no. 3 approach

[0089] Figure 7 A cross-sectional view of a spirally wound body 20 according to a third embodiment of the present invention is shown. The spirally wound body 20 has the same structure as that of the first embodiment, except that the exposed positive electrode region 21D is included in the outer end portion 22B1 at a position opposite to the outer end portion 22B1 of the negative electrode active material layer 22B. Except for the protective element 30 on the outside and inside of the region 21D, the spirally wound body 20 can be formed in the same manner. Therefore, the same components are denoted by the same numerals as in the first embodiment. Figure 7 Diaphragm 23 is not shown.

[0090] In this embodiment, as described above, the exposed positive electrode region 21D is included on the outer side and the inner side of the exposed positive electrode region 21D at a position opposite to the outer end portion 22B1 of the negative electrode active material layer 22B in a ci...

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Abstract

A secondary battery capable of improving charge-discharge cycle characteristics in the case where an alloy material is used as an anode active material is provided. An exposed cathode region is disposed in an outer end portion of a cathode. The exposed cathode region includes an insulating protective member on at least one of an outer side and an inner side of the exposed cathode region in a position opposed to an outer end portion of an anode active material layer in one turn inside the outer end portion. In a cathode active material layer, a central angle between an outer end portion and a central end portion at the center of the spirally wound body is preferably within a range from 0 DEG to -90 DEG inclusive from the central end portion in a winding direction.

Description

[0001] Cross References to Related Applications [0002] The subject matter contained in this disclosure is related to Japanese Patent Application JP 2004-323997 filed in Japan Patent Office on November 8, 2004, Japanese Patent Application JP 2004-324002 filed in Japan Patent Office on November 8, 2004, filed in Japan Patent Office in 2004 Japanese Patent Application JP2004-323998 filed in Japan Patent Office on November 8, the entire contents of which are hereby incorporated by reference. technical field [0003] The present invention relates to a secondary battery including a spiral wound body formed by laminating a positive electrode and a negative electrode with an electrolyte therebetween, and spirally winding the positive electrode and the negative electrode, and more particularly to a A secondary battery comprising a negative electrode having a negative electrode active material capable of inserting and extracting an electrode reactant, the negative electrode active mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/40H01M10/04H01M4/02H01M4/38H01M10/36H01M2/26H01M2/34H01M4/134H01M4/1395H01M4/58H01M10/05H01M10/052H01M10/0525H01M10/0587
CPCY02E60/12Y02E60/122Y02E60/10Y02P70/50
Inventor 桥本史子福嶋弦铃木浩之
Owner SONY CORP
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