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Incorporation of Reference Electrode into Electrochemical Device

IP.com Disclosure Number: IPCOM000239228D
Publication Date: 2014-Oct-22

Publishing Venue

The IP.com Prior Art Database

Related People

Quallion LLC: OWNER

Abstract

An electrochemical device includes one or more positive electrodes and one or more negative electrodes. The electrochemical device includes a reference electrode having an active medium on a porous substrate. The active medium includes one or more active materials. The porous substrate in the reference electrode results in a more accurate indication of the potential of the one or more positive electrodes and/or the one or more negative electrodes than can be achieved with non-porous substrates.

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Incorporation of Reference Electrode into Electrochemical Device

ABSTRACT

    The electrochemical device includes one or more positive electrodes and one or more negative electrodes. The electrochemical device includes a reference electrode having an active medium on a porous substrate. The active medium includes one or more active materials. The porous substrate in the reference electrode results in a more accurate indication of the potential of the one or more positive electrodes and/or the one or more negative electrodes than can be achieved with non-porous substrates.

BACKGROUND

    Overcharging and/or over-discharging lithium ion batteries often leads to decomposition of the battery components and/or plating of the active materials. This decomposition and/or plating can lead to shorts within the battery, overheating of the battery or even explosion. In order to reduce the opportunities for overcharging and/or over-discharging these batteries, the state of charge (SOC) and/or depth of discharge (DOD) of these batteries are generally monitored during operation of the battery. However, these characteristics are generally determined from the battery voltage. Since the battery voltage is the difference in potential between the positive and negative electrodes, the battery voltage does not provide any information about the absolute potential of the positive electrode and the negative electrode. As a result, even when these techniques are employed, the opportunity for battery damage still exists. For these reasons, there is a need for improving the safety of lithium ion batteries.

SUMMARY

A battery includes a reference electrode that includes an active medium on a porous substrate.

The active medium includes one or more active materials.

BRIEF DESCRIPTION OF THE FIGURES

Figure 1A is a perspective view of a battery where the top of the battery is visible.

    Figure 1B is a perspective view of the battery shown in Figure 1A but with the bottom of the battery being visible.

Figure 2 illustrates the relationship between different components of a battery. Figure 3A is a perspective view of a reference electrode.

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    Figure 3B is a cross section of the reference electrode shown in Figure 3A taken along the line labeled B.

    Figure 4A through Figure 4D illustrate the construction of a reference electrode assembly on a bottom cover. Figure 4A is an exploded view of the reference electrode assembly and the bottom cover.

    Figure 4B is a cross section of the reference electrode assembly and cover of Figure 4A taken through the reference electrode along the line labeled B in Figure 4A after the assembly of the reference electrode assembly on the cover.

    Figure 4C is a cross section of the reference electrode assembly and cover of Figure 4A taken through the reference electrode along the line labeled C in Figure 4A after the assembly of the reference electrode assembly on the cover.

    Figure 4D is a cross section of the reference electrode assembly...