But now electric car charger products are more and more humanized in functional design. In the consideration of general problems, the high-standard technology of electric vehicle charger is better. As long as the voltage and current between the electric car charger and the battery match, charging is ok.
In addition, high-standard and high-end electric car charger and Yi Hao charging electric car charger have designed brand-new protection functions, such as constant current charging and constant voltage charging. The main factors causing battery damage due to improper electric car charger are current and voltage.
Extended data:
Matters needing attention in electric vehicle charger:
First, constant current charging
The main characteristics of constant current charging of electric vehicle charger are that the charging method is adaptable and the charging current can be selected and adjusted at will. Therefore, the battery can be charged in different situations and states (such as initial charging of new batteries, supplementary charging of used batteries, desulfurization charging, etc.). ).
It is especially suitable for charging a battery pack with multiple batteries connected in series for a long time with small current, which is beneficial to charging batteries with slow capacity recovery.
However, because the initial charging current is too small and the later charging period is too large, the whole charging process takes a long time and produces a lot of gas, which has great influence on the electrode plate, high energy consumption and low efficiency (less than 65%), and the whole charging process must be supervised by a special person. Therefore, it is only used when the battery is charged for the first time and needs a long time and a small current for desulfurization and charging.
Second, constant voltage charging.
The main characteristics of electric vehicle charger are: the initial charging current is quite large, the battery electromotive force and the relative density of electrolyte increase rapidly, with the continuation of charging, the charging current decreases gradually, and only a small current passes at the end of charging; Short charging time and low energy consumption. Generally, the battery can obtain 90% ~ 95% of its own capacity after charging for 4 ~ 5h.
If the charging voltage is properly selected, the whole charging process can be completed within 8 hours, and the whole charging process needs no care, so it is widely used in supplementary charging.
The disadvantages of constant voltage charging are:
Because the initial charging current is too large, when charging the battery with too large discharge depth, the initial charging current will rise sharply, which will easily lead to over-current of the charged battery and damage the charging equipment. In the process of charging, because the charging current is not adjustable, it is not suitable for the initial charging and desulfurization charging of batteries.
Because it is difficult to compensate for the change of battery voltage when charging, it is difficult for a battery with slow capacity recovery to be fully charged.
Third, balanced charging.
For battery packs composed of many single cells, such as fixed batteries, after running for a certain date, they should be charged regularly and evenly. This is because when charging under the same conditions at ordinary times, the charging degree of active materials in different parts of the electrode plate is different, which leads to uneven reaction of active materials.
In addition, considering the differences in some charging and discharging characteristics between single cells, some single cells will be under-charged. Therefore, after normal charging, continue to charge 1 ~ 3h at a current rate of about 20h. This kind of charging is also called overcharge. When batteries are usually used under the same conditions, it is beneficial to carry out balanced charging regularly in battery maintenance.
Different users have different regulations on the interval of balanced charging, and some stipulate that it should be carried out once every three months or half a year. According to the development of battery design and manufacturing technology, there is little difference in battery characteristics, so the interval of balanced charging tends to be extended.
Fourth, floating charging.
The battery used intermittently or only when the AC power supply is cut off is charged by floating charge. For example, for a fixed battery, a voltage of 2. 15 ~ 2.2V is applied to each single battery, and the battery is charged with a continuous small current.
The charger is connected in parallel with the battery, and the charging current can mainly supplement the self-discharge loss, that is, the rate range of 10h is 0.3% ~ 1.0%. The normal load is borne by the charger, and the short-term heavy load is also supplied by the battery. At this time, the battery is automatically charged because the terminal voltage of the battery drops.
Verb (abbreviation for verb) Constant voltage and current limiting charging
Constant-voltage current-limiting charging is mainly used to make up for the shortcoming of excessive charging current during constant-voltage charging (the method is the same as constant-voltage charging), and the charging current is automatically adjusted by connecting a resistor (current-limiting resistor) in series between the charging power supply and the charged battery.
When the charging current is too large, the voltage drop on the current limiting resistor is also large, thus reducing the charging voltage; When the charging current is small, the voltage drop on the current limiting resistor is also small, and the voltage loss output by the charging equipment is also small. In this way, the charging current is automatically adjusted so as not to exceed a certain limit. This method is widely used in the initial charging of maintenance-free batteries and the supplementary charging of ordinary batteries.
Baidu encyclopedia-electric vehicle charger