Single-electrode potential measurement method suitable for alkaline sealed cell and its device

Abstract

A single-electrode potential measurement method for alkaline sealed battery and device thereof adopt a built-in sintered nickel electrode as the reference electrode. The device comprises a conductive housing, two conductive anti-explosion covers positioned at both ends of the housing and insulatively and hermetically connected with the housing, wherein an electrolyte, a membrane and a positive electrode, a negative electrode and the sintered nickel electrode isolated from each other by the membrane are arranged in the housing; any of the positive electrode, the negative electrode and the sintered nickel electrode is electrically connected with the housing; and the other two electrodes are respectively and electrically connected with two anti-explosion covers. The invention solves the difficult problem in sealing and has the advantages of simple operation and no addition of extra size. The method for potential measurement of the positive and the negative electrodes by using the built-in sintered nickel electrode used as reference electrode is suitable for nickel-based aqueous batteries, such as Cd-Ni battery, MH-Ni battery and Zn-Ni battery.

Description

Technical field [0001] The invention particularly relates to a method and device for measuring the potential of a single electrode. Background technique [0002] In battery research, in order to measure the electrode potential of the positive or negative electrode, a reference electrode must be used. In order to maintain the accuracy and stability of the measurement results, the electrode potential of the reference electrode is required to be stable and reproducible, and it will not chemically react with the measured electrode system. In addition, it should be simple in structure, easy to make, and convenient to use and store. [0003] Reference electrodes have been widely used in open battery systems. For example, in alkaline open battery systems such as Cd-Ni and MH-Ni batteries, the main ones used are Hg / HgO and Cd / Cd(OH) 2 Reference electrode; Cd / CdSO is mainly used in acidic open battery systems such as lead-acid batteries 4 Reference electrode. There is a large space in the...

AI Technical Summary

Problems solved by technology

Therefore, the positive and negative electrode potentials measured in the open state cannot reflect the real situation of the sealed battery during use

[0008] Cd / Cd(OH) 2 The reference electrode is used to seal the battery system, but there are these problems: 1. The structure is too complicated and it is difficult to ensure the sealing of the battery; 2. Due to the need to place a complex reference electrode and achieve sealing, the battery cavity is enlarged 3, Cd / Cd(OH) in the sealed battery 2 The reference electrode is greatly affected by oxygen, that is, the reference electrode is oxidized or poisoned, the potential of the reference electrode changes greatly during the charging process, and its stability cannot be maintained

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