Battery

Abstract

Provided is a battery in which a case accommodates: a coil structure electrode body comprising a band-shaped positive electrode comprising a positive electrode lead, a band-shaped negative electrode comprising a negative electrode lead, and a band-shaped separator which is disposed between the positive electrode and the negative electrode; and an electrolyte. The positive electrode lead and the negative electrode lead are drawn out from one end surface of the electrode body, and the electrode body comprises a separator molding part which protrudes from the other end surface thereof. The battery satisfies Formula 1 and Formula 2. Formula 1: 0.08<=W2 / Ws<=0.17 Formula 2: 0.20<=W4 / W2<=0.53 In Formula 1 and Formula 2: W1 is the quantity by which the separator on the one end surface side extends beyond the negative electrode; W2 is the quantity by which the separator on the other end surface side extends beyond the negative electrode; Ws is the width of the separator; and W4 is a dimension from an end part of the negative electrode to a bottom part of the electrode body (excluding a tape thickness).

Description

technical field [0001] The present invention relates to a battery having an electrode body in which a positive electrode and a negative electrode are laminated with a separator interposed therebetween. Background technique [0002] In recent years, a large number of portable electronic devices such as smartphones and notebook computers have appeared, and efforts have been made to reduce their size and weight. As portable power sources for these electronic devices, non-aqueous electrolyte secondary batteries (such as lithium ion secondary batteries) are used. As an example of a secondary battery, a structure having an electrode body in which a positive electrode and a negative electrode are stacked with a separator interposed therebetween is known. [0003] For example, Patent Document 1 describes that, while achieving a large discharge capacity, by redesigning the conventional electrode dimensions (the relationship between the positive electrode and the negative electrode),...

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Problems solved by technology

In addition, Patent Document 2 does not have the electrolyte holding function of the electrode body itself as in the present invention.

In addition, Patent Document 3 is a technique for suppressing an internal short circuit, which is different from the present invention in which a diaphragm is compressed to improve longitudinal vibration.

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