Taking the capacity testing in nickel hydrogen battery testing as an example, there are many basic battery performance parameters that we need to know, and knowing these is also the basis for conducting nickel hydrogen battery testing. So, let's briefly talk about the following parameters:

1. Open circuit voltage (OCV) of the battery

When the battery is not discharging, The potential difference between the two poles of a battery is usually referred to as the open circuit voltage. The open circuit voltage of a battery varies depending on the positive and negative electrodes of the battery, as well as the material of the electrolyte. In one case, regardless of the size and geometric structure of the battery, the starting open circuit voltage for ordering is the same. In this case, the positive and negative electrode materials of the battery are exactly the same

2. Overdischarge of the battery

If the battery exceeds the discharge termination voltage during the discharge process and continues to discharge, it may cause an increase in internal pressure of the battery, damage the reversibility of positive and negative active substances, and significantly reduce the capacity of the battery

3. Overcharge of the battery

If the battery continues to charge after reaching a fully charged state during charging, it may cause an increase in internal pressure, deformation, night leakage, and other situations, and the performance of the battery may also be significantly reduced and damaged

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4. Self discharge of the battery

The battery, whether in use or not, can experience power loss due to various reasons If calculated on a monthly basis, the self discharge of lithium-ion batteries is about 1% -2%, and that of nickel hydrogen batteries is about 3% -5%

5. Cycle life of the battery

Under repeated charging and discharging, the battery capacity gradually decreases to 60% -80% of the initial capacity.