An electric vehicle manufacturer gave me a copy of the charger technical requirements proposed by the battery factory, as follows:
Charging current: 1.8A
Charging voltage: 59.2~59.47V
Float charge voltage: 57.3V
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Float charge stream: 0.3A
Voltage accuracy: ≤0.1V
After a phone call with the battery factory, I got confirmation from the battery factory.
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This charging voltage voltage, during charging, exceeds the oxygen evolution voltage, and even exceeds the hydrogen evolution voltage by 0.3 to 0.6V. So every charge is a lot of gas loss.
The float voltage also exceeds the oxygen evolution voltage.
Electric vehicle batteries
The current of constant voltage to float charge is 0.3A, and the self-discharge of this battery is relatively large.
The battery factory actually said that the battery warranty was 18 months, and I said that such a charger condition could not even do 80 deep cycles. How battery factories do it. Battery factory language plug.
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In order to pursue short-term behavior, some battery factories make the initial capacity of the battery very large, one is that the specific gravity of sulfuric acid is too high, and the other is the positive plate active substances are added. This is to give the user (the car manufacturer) a very good first impression, but the life expectancy is very poor.
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The charger is also to increase the voltage, the capacity of the battery will rise, in fact, the battery killer.
The depot does not understand these situations, only to do a few times, dozens of tests, it seems very good, but the general depot does not have the conditions to do life tests, the depot is easy to be deceived