Aqueous electrolyte system battery discharge storage capacity test method

Abstract

The present invention provides an aqueous electrolyte system battery discharge storage capacity test method. The method comprises: taking an activated battery, opening at the top of the battery, and placing the calomel electrode and injecting the electrolyte into the battery; connecting the calomel electrode respectively with the positive electrode and the negative electrode of the battery; takinga certain discharge current I to perform constant-current discharge on the battery until a negative voltage of the battery reaches 0 to 0.5 V; recording the battery voltage, the positive terminal voltage and the negative terminal voltage at regular intervals during the battery discharge process so as to draw curves in which the battery voltage, the positive terminal voltage and the negative terminal voltage change with the time in the same figure with the recording time as an X-axis and the voltage as a Y-axis; finding out the time t1 corresponding to the starting point of the flat curve of the time changing curve of the positive terminal voltage in the figure, and finding out the time t2 corresponding to the intersection of the time changing curve of the negative terminal voltage and thetime changing curve of the battery voltage; and finally calculating the discharge storage capacity C by using the formula. The method provided by the present invention has a simple operation and highdata accuracy.

Description

technical field [0001] The invention relates to a method for testing the discharge storage capacity of an aqueous electrolyte system battery. Background technique [0002] Aqueous electrolyte system batteries include nickel-metal hydride, nickel-cadmium, nickel-zinc and other batteries. During the battery design process, the negative electrode capacity is slightly excessive, and the excess positive electrode capacity of the negative electrode is composed of discharge storage capacity and charge storage capacity. The battery capacity is composed of It is determined by the positive electrode; the discharge storage capacity is the irreversible capacity generated during the charging process of the battery, and the charge storage capacity = negative electrode design capacity - positive electrode design capacity - discharge storage capacity; the discharge storage capacity is related to the low-temperature power characteristics of the battery, and the larger the discharge storage ca...

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Problems solved by technology

[0002] Aqueous electrolyte system batteries include nickel-metal hydride, nickel-cadmium, nickel-zinc and other batteries. During the battery design process, the negative electrode capacity is slightly excessive, and the excess positive electrode capacity of the negative electrode is composed of discharge storage capacity and charge storage capacity. The battery capacity is composed of It is determined by the positive electrode; the discharge storage capacity is the irreversible capacity generated during the charging process of the battery, and the charge storage capacity = negative electrode design capacity - positive electrode design capacity - discharge storage capacity; the discharge storage capacity is related to the low-temperature power characteristics of the battery, and the larger the discharge storage capacity, The power characteristics of the battery at low temperature are better; the charge storage capacity is related to the cycle life of the battery, the less the charge storage capacity is, the risk of overcharging exists during the charge and discharge cycle of the battery, and a large amount of hydrogen is generated, resulting in a larger internal pressure of the battery , there is a risk of leakage

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