The battery has a self-discharge effect. From the production and manufacturing workshop to the user, it is about to delay months. Taking the PA-NASIONIC battery as an example, at ambient temperature at 30 ° C for 8 months, the residual capacity of the battery is only half the factory, so for the newly purchased battery, it is generally taken for a long time. Charging, this is called an initial charging. The primary charging current of the battery should be charged according to 0.1c, and the battery can be recharged after the discharge, which is called normal charging. Two charging methods are currently used in UPS: floating and pulse charge. The so-called floating charge refers to the output of the rectifier and the battery is connected in parallel, and at the same time, the current is supplied to the load, and the current supplied by the rectifier is divided into the load, and the other will be given to the battery, and the battery is given to the battery, floating. The chargeable mode is easy to connect, and it is good for improving the transient response characteristics of UPS output. The pulse charge is characterized by changing the charging current with the battery capacity, and the charging time can be shortened.
Since the UPS battery is a standby mode of operation, the mainstation of the main electricity is in the state of charge, and only when power is powered off. In order to extend the service life of the battery, the charger of the UPS generally controls the constant voltage limit. After the battery is filled, it is converted to a floating state.
For batches of the terminal voltage of 12 V, the normal floating voltage is between 13.5 to 13.8. The floating charge voltage is too low, the battery is dissatisfied, and the floating voltage is too high, which will cause overvoltage charging. When the floating voltage exceeds 14V, it is considered to be overvoltage charging. It is strictly forbidden to charge the battery pack, because the overvoltage charge can cause water contained in the electrolyte in the battery to exceed hydrogen and oxygen, resulting in an increase in electrolyte concentration, resulting in shortening the battery life, or even damage.
2. Charge current
The battery charging current is generally expressed in C, and the actual value of C is related to the battery capacity. For example, if it is a 100AH battery: C is 100A. Panasonic lead acid freely maintains the optimum charge current of the battery is about 0.1c, and the charging current cannot be greater than 0.3c. The charging current is too large or too small to affect the battery life of the battery.
The ideal charging current should adopt a staged current charging method, that is, a large current is used in the initial stage of charging, and after a certain period of charge, it is changed to a smaller current, and a smaller current is changed at the end of the charging. The design of the charging current is generally 0.1c, which is considered to be overcurrent charging when the charging current exceeds 0.3c. Avoid charging with a fast charger, otherwise the battery will be in the "instantaneous overcurrent charging" and "instantaneous overvoltage charging" state, resulting in a battery that can be lowered or even damaged the battery. Overcurrent charging can result in bending of battery poles, active substances fall off, resulting in low battery supply capacity, while damage to the battery.
3. Charge mode
The lead-acid battery discharge product is leaded by sulfate. If it is not transformed in time, the battery is in a state of charge, thereby reducing the battery discharge capacity and shortening the battery life. Therefore, the battery pack must be in a sufficient electrical state. For different situations, can be floated and both.
(1) Floating charge. The online battery pack is a long-term parallel in the charger and load line, as a reserve power supply. In general, floating charge is used, and the monomer battery voltage is controlled at 2.25V (relative to 2V battery), and periodically observed, and the floating voltage variation is recorded. If the single battery voltage is low, it means that the battery is insufficient, the capacity is not enough, and it should be paid to track.
(2) Balance charging. The above-called equalization charging is parallel each of the battery cells and charging with a unified charging voltage. If the battery pack has a backward battery in the floating process (the monomer voltage is less than 2.20V, relative to 2V battery), or will be charged, and the unitary battery is controlled in 2.35V, charge 6 ~ 8h (note, once the time is not too long), then adjust to the floating charge voltage value, then observe the backward battery voltage change, if the voltage is still in place, it will be charged again after two weeks. In general, the new battery pack floating through 6 months, and the voltage will tend to be consistent. Balance charging current is typically selected from 0.3c or slightly less than 0.3c. A battery of the rated voltage is 12V, and the balanced charging voltage is generally selected 14.5V.
Article from: http://www.brcpower.com/
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