-Elaborate on the characteristics and causes of internal faults in batteries

Elaborate on the characteristics and causes of internal faults in batteries
author:enerbyte source:本站 click211 Release date: 2023-09-19 10:23:10
abstract:
The phenomenon of plate vulcanization failure is characterized by the formation of insoluble white coarse crystalline lead sulfate on the plate, which cannot be converted into active substances during normal charging. When a faulty battery is discharged, the voltage drops sharply and premature...

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The phenomenon of plate vulcanization failure is characterized by the formation of insoluble white coarse crystalline lead sulfate on the plate, which cannot be converted into active substances during normal charging. When a faulty battery is discharged, the voltage drops sharply and prematurely drops to the termination voltage, resulting in a decrease in battery capacity; The electrolyte density is below normal. When charging a battery, the single cell voltage rises too fast and the electrolyte temperature rapidly increases, but the density increases slowly and bubbles appear too early, even during charging.

The following situations can cause plate vulcanization:

(1) Long term insufficient charging or delayed charging after discharge leads to a partial dissolution of lead sulfate on the electrode plate in the electrolyte. The higher the ambient temperature, the greater the solubility of lead sulfate. When the ambient temperature decreases, the solubility of lead sulfate decreases, and the dissolved lead sulfate will precipitate. Due to temperature changes during battery operation, the precipitated lead sulfate will crystallize and precipitate again on the electrode plate, forming sulfide. Semi-discharged batteries cannot be stored for a long time, and it is particularly important to regularly recharge the batteries to maintain a fully charged state.

(2) The electrolyte level is too low, causing the upper part of the electrode plate to come into contact with air and be oxidized. During driving, the fluctuation of the electrolyte and the contact with the oxidized part of the electrode plate will generate a large grain lead sulfate hardening layer, causing the upper part of the electrode plate to sulfurize. Therefore, it is necessary to regularly check the electrolyte level height and density. If the level drops, distilled water should be added in a timely manner.

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