Electrochemical device and electronic device

Abstract

The invention relates to the technical field of batteries, and discloses an electrochemical device and an electronic device. The electrochemical device comprises a shell, an electrode assembly, a first tab and a second tab, the electrode assembly comprises a first pole piece, a second pole piece and an isolating membrane. The first pole piece comprises a first current collector. The second pole piece comprises a second current collector and a plurality of conducting strips; the plurality of conducting strips protrude from the second current collector along a first direction, the plurality of conducting strips are laminated in the thickness direction of the electrode assembly to form a collection part, and the first direction is perpendicular to the thickness direction. And the first tab is connected with the first current collector. And the second tab is connected with the collection part. The conductivity of the first tab is g1S / mm, the sectional area of the first tab in the direction perpendicular to the extension direction of the first tab is s1mm < 2 >, the conductivity of the plurality of conducting strips is g2S / mm, the sum of the sectional areas of the plurality of conducting strips in the direction perpendicular to the extension direction of the conducting strips is s2mm < 2 >, and (g1 * s1) / (g2 * s2) is larger than or equal to 0.8 and smaller than or equal to 1.2. The electrochemical device can improve the problem of insufficient cycle performance caused by poor consistency of the active material layer of the first pole piece and the active material layer of the second pole piece.

Description

technical field [0001] The present application relates to the technical field of energy storage, in particular to an electrochemical device and an electronic device. Background technique [0002] An electrochemical device is a device that converts external energy into electrical energy and stores it inside, so as to supply power to external devices (such as portable electronic devices) when needed. Generally, an electrochemical device includes a casing, an electrode assembly and tabs accommodated in the casing. Wherein, the electrode assembly includes a first pole piece, a second pole piece and a separator, the polarity of the first pole piece is opposite to that of the second pole piece, and a separator is arranged between them for separation. One end of one tab is connected to the first pole piece, and the other end extends out of the casing; a plurality of conductive sheets extend from the edge of the second pole piece, and the plurality of conductive sheets are stacked,...

AI Technical Summary

Problems solved by technology

[0004] The purpose of this application is to provide an electrochemical device and an electronic device to improve the poor cycle performance caused by the poor consistency between the active material layer of the first pole piece and the active material layer of the second pole piece of the current electrochemical device

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