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How does the battery work? In the communication power supply, the battery plays an important role in ensuring the uninterrupted power supply of the communication equipment.

So, how on earth does the battery provide reliable backup power?

When the battery needs to store electricity, it converts it into chemical energy and stores it through chemical reaction. This process is called charging, which is similar to storing water in a pool.

When the battery needs to provide electricity, it converts chemical energy into electricity through chemical reaction. This process is called discharge, which is similar to receiving water from a pool.

Why do you need temperature compensation? In the process of charge / discharge of the battery, the chemical reaction is sometimes too strong / gentle, so that the battery can not work properly.

In order to ensure the normal energy conversion and protect the health of the battery, it is necessary to carry out "temperature compensation".

Next, let's introduce the two main factors that affect the chemical reaction intensity of the battery:

Temperature: the intensity of the battery chemical reaction is closely related to the temperature. Under the same charging voltage:

As the temperature of the battery increases, the chemical reaction becomes more intense.

As the temperature of the battery decreases, the chemical reaction becomes more gentle.

Floating charge voltage: the correct floating charge voltage is the basic guarantee of battery health. At the same temperature:

The floating charge voltage of the battery increases, the chemical reaction becomes more intense, and the charging current increases.

The floating charge voltage of the battery decreases, the chemical reaction is smoother, and the charging current decreases.

Due to the variety of scenarios in which our communication power supply is used, the ambient temperature actually used by the battery varies greatly, which has a great impact on the internal chemical reaction of the battery.

At this time, the influence of temperature change on the battery can be weakened by adjusting the "floating charge voltage".

When the battery temperature is high, reduce the floating charge voltage and slow down the chemical reaction.

When the temperature of the battery is low, the floating charge voltage is increased to enhance the chemical reaction.

By adjusting the "floating charge voltage", the function to ensure the normal energy conversion of the battery is "temperature compensation".

The reasonable implementation of "temperature compensation" can effectively prolong the service life of the battery and improve the efficiency of the battery.

How to realize temperature compensation? Taking the communication DC switching power supply as an example, in order to realize temperature compensation, it is necessary for the communication DC switching power supply to monitor the temperature of the battery in real time and adjust the floating charge voltage of the battery in time according to the measured temperature.

The monitoring unit in the communication DC switching power supply has the ability to monitor the temperature and adjust the floating charge voltage.

For the communication DC switching power supply using 48V battery pack, the temperature compensation is usually based on 25 ℃, the floating charge voltage is based on 53.5V, and is adjusted by-3 mV/ ℃ of each (2 V) battery.

For example, for the communication power supply of 48 V battery pack, if the battery temperature is detected to be 10 ℃, the floating charge voltage is calculated as follows:

V floating charge = 53.5V + (10 °C-25 °C) × (- 3 mV) × 24

= 54.58V

For the communication power supply, the floating charge voltage of the battery is higher than 53.5 V in winter and lower than 53.5 V in summer, which is the result of temperature compensation, which is beneficial to better manage and protect the battery.

Can the health of the battery only rely on "temperature compensation"? After reading this, you must have understood the basic principles of temperature compensation. Then the battery is healthy, can we only rely on "temperature compensation"?

A: of course not, temperature compensation is not omnipotent!

The temperature compensation function can minimize the impact of temperature on the battery, but it does not mean that it can be used at any temperature.

Long-term low temperature: floating charge voltage increases, if the floating charge voltage is too high for a long time, it will accelerate the corrosion of the metal grid in the battery, and even cause "water loss" of lead-acid battery. This will shorten the life of the battery.

Long-term high temperature: the floating charge voltage decreases, if the floating charge voltage is too low for a long time, it will lead to the battery charging dissatisfaction. Affect the capacity of the battery. This will greatly reduce the efficiency of the battery.

Especially in the stations where the ambient temperature changes greatly, the temperature has a great influence on the chemical reaction speed in the battery. If we only rely on our own temperature compensation function, we can not make maximum use of the battery capacity, resulting in a shorter battery life.

Therefore, in order to maintain the best working temperature of the battery at 20 ℃ ~ 25 ℃, in addition to its own temperature compensation function, it also depends on the air conditioning and fresh air system.

At this point in summary, do you know the nature of temperature compensation?

What exactly is temperature compensation?

By adjusting the floating charge voltage, the effect of temperature on the battery is reduced to a minimum, which essentially compensates the activity of chemical reactions at different temperatures.

This article comes from the official account of Wechat: ZTE document (ID:ztedoc), author: ZTE document

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