Device and method for monitoring stress of electrode material in battery and application

Abstract

The invention discloses a stress monitoring device and method for an electrode material in a battery and application, and belongs to the field of batteries. The device comprises a current collector, an optical fiber, a fiber bragg grating, a tab glue and a conductive metal sheet, wherein the electrode material is attached to the current collector, the optical fiber is embedded in the electrode material, the fiber bragg grating is engraved in the optical fiber, the optical fiber penetrates out of the current collector and is attached to the edge of the current collector, the conductive metal sheet is fixed to the surface of the current collector in a welding mode, penetrates out of the current collector and is parallel to the optical fiber, and the tab glue is pasted to the edge outside the current collector in pairs and covers the upper surface and the lower surface of the optical fiber and the upper surface and the lower surface of the conductive metal sheet. The invention further provides a preparation method and application of the monitoring device. The device solves the technical problem that in the prior art, the strain of the electrode material in the battery cannot be obtained in an in-situ, lossless and accurate mode.

Description

technical field [0001] The invention belongs to the field of batteries, and more specifically relates to a device, method and application for monitoring stress of electrode materials in batteries. Background technique [0002] During the working process of the battery, both the positive electrode and the negative electrode are undergoing chemical reactions to convert energy between chemical energy and electrical energy. In this process, not only the type of material changes, but also the structure changes. Taking the anode of a lithium battery as an example, if a graphite anode is used, the volume expansion rate is about 12%, while the silicon anode with higher energy density has a volume expansion rate of 300%. This huge volume change will cause structural damage and thus cause battery failure. [0003] In order to better understand the volume change process of electrode materials during the actual charge-discharge process and optimize the electrode structure to accommodat...

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Problems solved by technology

[0006] Aiming at the defects of the prior art, the object of the present invention is to provide a device, method and application for monitoring the stress of the electrode material in the battery. The optical fiber engraved with the fiber grating inside is embedded in the electrode material of the battery. The change of the wavelength can obtain the change of the stress of the electrode material, which aims to solve the technical problem that the strain of the electrode material in the battery cannot be obtained in situ, non-destructively and accurately in the prior art

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