Nonaqueous secondary battery

a secondary battery, non-aqueous technology, applied in the direction of batteries, cell components, sustainable manufacturing/processing, etc., can solve the problems of cid may malfunction, battery may be overcharged to higher than a predetermined voltage, cid is likely to malfunction, etc., to achieve accurate operation during overcharge, the effect of stably controlling the volume of “the unnecessary pores”

Active Publication Date: 2017-03-16
TOYOTA JIDOSHA KK
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Benefits of technology

This patent describes a technique for improving the performance of lithium ion batteries. By controlling the percentage of impurity atoms in the positive electrode active material layer, the concentration of impurities in the entire positive electrode active material layer can be reduced, resulting in improved efficiency and increased power capabilities. Additionally, by reducing the number of impurities in the positive electrode active material layer, the overall pore volume of the positive electrode active material layer can be minimized, allowing for better filling of the voids within the positive electrode active material layer. Overall, this technology helps improve the quality and consistency of the positive electrode active material layer's pore volume.

Problems solved by technology

The technical problem addressed in this patent text is how to prevent damage to a nonaqueous secondary battery while maintaining its performance and reliability. Specifically, there are two main factors: (1) the residual space within the battery case, (2) the potential danger of overcharge gas production causing malfunctions in the CID system.

Method used

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Embodiment Construction

[0031]Preferred embodiments of the invention are described below. Matters (for example, components or a general manufacturing process of a battery which is not a characteristic of the invention) necessary to practice this invention other than those specifically referred to in this description may be understood as design matters based on the related art in the pertinent field for a person of ordinary skills in the art. The invention can be practiced based on the contents disclosed in this description and common technical knowledge in the subject field.

[0032]

[0033]A nonaqueous secondary battery according to an embodiment of the invention includes: an electrode body that includes a positive electrode, a negative electrode, and a separator; a nonaqueous electrolytic solution containing a gas producing agent; a battery case; and a pressure-operated current interrupt device (CID). A ratio (Vt / Cr) of a sum Vt (cm3) of pore volumes in the electrode body to a remaining space volume Cr (cm3) i

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Abstract

In a nonaqueous secondary battery including a pressure-operated current interrupt device, a ratio (Vt/Cr) of a sum Vt (cm3) of an effective pore volume Vp of the positive electrode active material layer, an effective pore volume Vn of the negative electrode active material layer, and a pore volume Vs of the separator to a volume Cr (cm3) of a remaining space in the battery case is 0.92 to 1.05. The volume Cr of the remaining space in the battery case is calculated by subtracting a volume Ce of the electrode body, a volume Cna of the nonaqueous electrolytic solution, and a volume Cc of auxiliary components from a volume Ct of the battery case. The remaining space volume Cr (cm3) is 14.8 vol % or higher of the volume Ct (cm3) of the battery case.

Description

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Claims

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Application Information

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Owner TOYOTA JIDOSHA KK
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