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Assembled sealing body and battery using same

A sealing body and battery technology, which is applied to lithium batteries, battery pack components, non-aqueous electrolyte batteries, etc., can solve the problems of battery temperature rise and battery internal pressure easy to rise, and achieve the effect of high output characteristics

Inactive Publication Date: 2011-08-17
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after the performance of the battery itself is improved, when a problem such as a short circuit occurs, the internal pressure of the battery is likely to increase due to the gas generated by the decomposition of the battery and the electrolyte.
Furthermore, due to such a problem, the temperature of the battery may rise sharply

Method used

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  • Assembled sealing body and battery using same
  • Assembled sealing body and battery using same
  • Assembled sealing body and battery using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0132] make figure 1 The sealed cylindrical battery shown.

[0133] (1) Production of positive plate

[0134] Lithium cobalt oxide (LiCoO 2 ). N-methyl-2-pyrrolidone (hereinafter referred to as PVDF) of the positive electrode active material of 85 parts by weight, 10 parts by weight of carbon powder as a conductive agent and polyvinylidene fluoride (hereinafter referred to as PVDF) as a binder NMP) solution mixed to obtain positive electrode mixture slurry. The added amount of PVDF was 5 parts by weight.

[0135] The obtained positive electrode mixture slurry was coated on both sides of a current collector made of aluminum foil with a thickness of 15 μm, dried and rolled to produce a positive electrode plate with a thickness of 100 μm.

[0136] (2) Production of negative plate

[0137] 95 parts by weight of artificial graphite powder as negative electrode active material and NMP solution of PVDF as binder were mixed to obtain negative electrode mixture slurry. The added...

Embodiment 2

[0152] Except that the heat-expandable material uses 3M's fire-resistant layer (trade name, a sheet material made of a resin composition containing neoprene and vermiculite, expansion rate at 120°C: 300%), the others are the same as In the same manner as in Example 1, a battery 2 was fabricated.

Embodiment 3

[0154] In addition to using Mitsui Metal Paint Chemicals Co., Ltd. Mejihikatsuto (trade name, sheet material composed of a resin composition containing polyurethane resin and expandable graphite, expansion rate at 120°C: 400%) as the thermally expandable material, Others are the same as in Example 1, and a battery 3 is produced.

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Abstract

The invention refers to an improved, assembled sealing body used for a battery. When used in a battery having a particularly high capacity and high output characteristics, the assembled sealing body can reliably stop charging and discharging of the battery when a problem occurs in the battery. An assembled sealing body for a battery includes (i) an electrically conductive cap having an outer terminal, (ii) a metallic plate disposed on the side which faces a power generation element and connected to one electrode which is included in the power generation element, (iii) an electrically conductive valve body disposed between the cap and an electrically conductive film-like material, and (iv) a thermal expansion material disposed between the valve body and the electrically conductive film-like material. The electrically conductive film-like material and the valve body are conductively joined together at at least one predetermined position. When the thermal expansion material is expanded by a predetermined magnification, the joint between the electrically conductive film-like material and the valve body is broken to interrupt the conduction between the electrically conductive film-like material and the valve body.

Description

technical field [0001] The present invention relates to batteries, and specifically relates to improvement of assembly seals used in batteries. Background technique [0002] Many types of batteries are known. For example, a lithium secondary battery is a representative battery for small daily life. Lithium secondary batteries can be used at normal temperature, have high operating voltage and high energy density, and good cycle characteristics. Therefore, lithium secondary batteries are widely used as power sources for portable and small electronic devices such as mobile phones, portable information terminals (PDAs), notebook computers, and video cameras. In recent years, as the performance of portable electronic devices has increased, batteries used as power sources have also been expected to have higher performance. [0003] On the other hand, large batteries are used for power storage and motor drive of electric vehicles such as hybrid vehicles and plug-in hybrid electr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/34H01M2/12H01M50/574
CPCY02E60/12H01M2/12H01M2/348H01M10/052H01M2/34Y02T10/7011Y02E60/10H01M50/30H01M50/581H01M50/574H01M50/572
Inventor 平川靖
Owner PANASONIC CORP