Non-aqueous electrolyte secondary battery cell and assembled battery using same

Abstract

The invention provides a non-aqueous electrolyte secondary battery cell in which a safety measure is taken and with which the energy density can be increased, and an assembled battery in which the cell is used. The cell itself is shaped as a rounded square tube. A core material (5) for preventing electrolyte permeation is provided at the center of the cell, the core member (5) being a hollow cylindrical insulator having a square cross-section. A cell monitoring system such as a temperature sensor (12) is provided in the hollow part of the core material (5). A cell base member comprising a positive electrode member, a separator, and a negative electrode member of a non-aqueous electrolyte secondary battery is wound around the core material (5). Terminals (1, 2) made of an electroconductivemetal electrically connected to the collector of the positive electrode member or the collector of the negative electrode member are provided so as to be exposed to the exterior of the cell. The temperature sensor (12) is attached to the center part of the hollow part of the core material (5) so as to be in close contact with the core material (5).

Description

technical field [0001] The present invention relates to a non-aqueous electrolyte secondary battery cell (Cell) used in lithium ion batteries for electric vehicles or energy storage, etc., and a battery pack using the non-aqueous electrolyte secondary battery cell, which has the function of ensuring safety. It is a characteristic that can significantly improve the practical energy density while using conventional battery materials. Background technique [0002] Lithium-ion batteries used in electric vehicles and the like include a positive electrode active material located around a positive electrode current collector and a negative electrode active material located around a negative electrode current collector via a separator. Aluminum is often used for the positive electrode current collector, and copper is often used for the negative electrode current collector. As the positive electrode active material, lithium-doped manganese oxide or the like is used, and as the negati...

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Problems solved by technology

On the other hand, the possibility of an external short circuit remains

[0006] For such safety, there are no necessary and sufficient countermeasures for battery cell leakage, overcharge, and cell high temperature. This is the status quo.

In addition, too much emphasis has been placed on safety, and safety guarantees have been considered in all aspects of unit production, module production, battery pack production, and storage of electric vehicles that have little relevance to safety. The battery system has become heavier than necessary, and the result is Practical capacity becomes smaller

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