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Nonaqueous electrolyte secondary battery and method for manufacturing the same

A non-aqueous electrolyte and secondary battery technology, which is applied in the field of safety technology, can solve the problems of increasing the thermistor material layer, the danger of lithium-ion secondary batteries, and the inability to guarantee the safety of lithium-ion secondary batteries. safety effect

Inactive Publication Date: 2008-10-01
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because it is difficult for the thermistor material layer to increase the resistance value of the thermistor material layer following a sharp temperature rise, the temperature in the lithium-ion secondary battery tends to decrease before the resistance of the thermistor material layer increases. Lithium-ion secondary batteries are in a dangerous state due to rising
Therefore, even if the technology disclosed in JP-A-6-231749 is adopted, the safety of lithium-ion secondary batteries cannot always be guaranteed.

Method used

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  • Nonaqueous electrolyte secondary battery and method for manufacturing the same
  • Nonaqueous electrolyte secondary battery and method for manufacturing the same
  • Nonaqueous electrolyte secondary battery and method for manufacturing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0070] In Embodiment 1, a lithium ion secondary battery is taken as an example of a nonaqueous electrolyte secondary battery, and its structure is shown.

[0071] figure 1 is a longitudinal sectional view showing the structure of the lithium ion secondary battery according to the present embodiment. figure 2 It is a sectional view showing the structure of the electrode group 9 included in the lithium ion secondary battery according to the present embodiment. FIG. 3 is a graph showing general temperature characteristics of a positive electrode active material.

[0072] Such as figure 1 As shown, the lithium ion secondary battery according to this embodiment includes, for example, a battery case 1 made of stainless steel, and an electrode group 9 accommodated in the battery case 1 .

[0073] An opening 1 a is formed on the upper surface of the battery case 1 . The sealing plate 2 is crimped on the opening 1a via the gasket 3, and the opening 1a is sealed by caulking the sea...

Embodiment approach 2

[0141] In Embodiment 2, the material of the porous insulating layer is different from the material of the porous insulating layer in Embodiment 1 described above. Hereinafter, the differences between the present embodiment and the above-mentioned first embodiment will be mainly described.

[0142] Figure 5 It is a sectional view showing the structure of the electrode group 19 in this embodiment.

[0143] As in Embodiment 1, the electrode group 19 in this embodiment includes the positive electrode 5 , the negative electrode 6 , and the porous insulating layer 17 . The positive electrode 5 includes a PTC layer 53 , the negative electrode 6 includes a PTC layer 63 , and the porous insulating layer 17 includes a material (not shown) that has no shutdown characteristics.

[0144] In the present embodiment, the material having no shutdown characteristic is a material which has no shutdown characteristic at a temperature lower than 130°C but has a shutdown characteristic at a temp...

Embodiment approach 3

[0149] In Embodiment 3, the structure of the electrode group and the fabrication method of the electrode group are different from those in Embodiment 1. Hereinafter, the differences between the present embodiment and the first embodiment will be mainly described.

[0150] Figure 6 It is a sectional view showing the structure of the electrode group 29 in this embodiment. Figure 7 It is a cross-sectional view showing a part of the electrode group in the comparative example.

[0151] The electrode group 29 in this embodiment includes a positive electrode 25 , a negative electrode 26 and a porous insulating layer 7 , the positive electrode 25 includes a PTC layer 53 , and the negative electrode 26 includes a PTC layer 63 .

[0152] As in the first embodiment, the PTC layers 53 , 63 each contain a material having a positive temperature coefficient of resistance. However, unlike Embodiment 1, the PTC layer 53 is provided in the positive electrode mixture layer 52 , and the PTC ...

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Abstract

A lithium ion secondary battery includes a positive electrode, a negative electrode, a porous insulating layer and a nonaqueous electrolyte. The porous insulating layer is provided between the positive electrode material mixture layer and the negative electrode material mixture layer and contains a material which does not have a shutdown function. The positive electrode is provided with a PTC layer extending substantially parallel to the positive electrode collector and the negative electrode is provided with a PTC layer extending substantially parallel to the negative electrode collector. Each of the PTC layers contains a material having a positive temperature coefficient of resistance.

Description

technical field [0001] The present invention relates to a nonaqueous electrolyte secondary battery and a method for manufacturing the nonaqueous electrolyte secondary battery, and particularly relates to safety technologies for lithium ion secondary batteries and the like. Background technique [0002] In recent years, the portability and wirelessization of electronic devices have been rapidly developed. As a power source for driving electronic devices, there is an increasing demand for small and lightweight secondary batteries with high energy density. [0003] A non-aqueous electrolyte secondary battery can be cited as a typical secondary battery satisfying such requirements. This nonaqueous electrolyte secondary battery has a positive electrode, a negative electrode, a polyethylene separator, and a nonaqueous electrolyte. In the positive electrode, a positive electrode active material (for example, lithium-cobalt composite oxide) that undergoes a reversible electrochemic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/40H01M2/34H01C7/02H01M10/38H01M4/13H01M4/139H01M10/0587H01M50/409H01M50/443H01M50/489H01M50/583
CPCH01M10/0587H01M4/13H01M2/16H01M2/34H01M10/0525H01M2200/106H01M2/1673H01M2200/00H01M4/667Y02E60/122Y02E60/10H01M50/409H01M50/46Y02P70/50H01M50/443H01M50/489H01M50/583H01M10/4235H01M50/581H01M50/491H01M50/431H01M50/446H01M50/449
Inventor 村冈芳幸和田直之西野肇笠松真治
Owner PANASONIC CORP
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