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Non-aqueous electrolyte secondary cell

一种非水电解质、二次电池的技术，应用在二次电池、电池、电池电极等方向，能够解决安全性降低、电池特性降低等问题，达到安全性良好的效果

Active Publication Date: 2016-02-10
SANYO ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the charging voltage is increased to increase the battery capacity, the overcharge inhibitor will be decomposed even at a voltage that is set in the normal use range according to the type of overcharge inhibitor, and there is concern about the performance of the battery after charge and discharge cycles. reduction and reduction in safety

Method used

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Embodiment approach

[0040] First, the non-aqueous electrolyte secondary battery of the embodiment will be described using FIGS. 1 to 4. As shown in FIG. 4, this non-aqueous electrolyte secondary battery 10 has a flat wound electrode body 14 wound in a state where the positive electrode plate 11 and the negative electrode plate 12 are insulated from each other with a separator 13 interposed therebetween. The outermost side of the flat wound electrode body 14 is covered by the separator 13, and the negative electrode plate 12 is on the outer peripheral side compared to the positive electrode plate 11.

[0041] Positive plate 11 such as Figure 3A As shown, on both sides of a positive electrode core body composed of aluminum or aluminum alloy foil with a thickness of about 10 to 20 μm, there are formed in a state where one end of the positive electrode core body along the width direction is exposed in a strip shape. Positive electrode mixture layer 11a. The portion of the positive electrode core expos...

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Abstract

The present invention ensures the operation of a pressure response-type current shutoff mechanism that makes it easy for carbonic acid gas generated by the breakdown of lithium carbonate in a positive electrode mixture layer to circulate to the outside of a flat winding electrode, and quickly raises the pressure inside a battery before the temperature inside the battery rises to the point of causing a failure, such as smoke, fire or explosion. A non-aqueous electrolyte secondary battery (10) of one embodiment of the present invention has a pressure response type current shutoff mechanism, and has insulating tape (11b) attached in the width direction of a positive electrode mixture layer (11a) at a position facing a separator (13) and on top of the positive electrode mixture layer (11a) at the winding start end and / or winding finish end of a positive electrode sheet (11) in a flat winding electrode (14).

Description

Technical field [0001] The present invention relates to a non-aqueous electrolyte secondary battery for vehicles. Background technique [0002] The non-aqueous electrolyte secondary batteries used in vehicles such as power supplies for driving electric vehicles (EV) and hybrid vehicles (HEV, PHEV) have, in addition to explosion-proof safety valves, a pressure detection type current blocking mechanism. The pressure detection type current blocking mechanism is activated by the gas that is quickly generated inside the battery during abnormality, and prevents the battery from rupturing or even catching fire by blocking the current flowing to the outside. [0003] In non-aqueous electrolyte secondary batteries, it is known to increase the charging voltage as one of the methods for increasing the battery capacity. In addition, as a safety measure when the non-aqueous electrolyte secondary battery becomes overcharged, it is known to add tert-amylbenzene, biphenyl (see Patent Document 1),...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0587H01M2/34H01M4/139H01M4/62H01M50/40H01M50/586
CPCH01M4/139H01M4/62H01M2200/20H01M10/0587H01M2220/20Y02E60/10H01M50/40Y02P70/50H01M50/586H01M50/578
Inventor 奥谷英治
Owner SANYO ELECTRIC CO LTD
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