| Addr： |
501 Kunming Lake Street, Shenyang Economic and Technological Development Zone |
| Tel： |
0531-80990922 |
| Fax： |
0531-80990922 |
| E-mail： |
978042374@qq.com |
| Website： |
http://www.songxiadl.com |
|
|
| Elementary Discussion on the Factors Affecting the Life of Panasonic Battery |
| Time：2019-03-04 Source：Panasonic Views：1018 |
As the core component of DC power supply system, storage battery plays a key role in reserving electric energy, coping with abnormal and special operation of power grid, and maintaining the normal operation of the system. It is the last line of defense for the normal operation of power system. At present, the on-line monitoring of storage batteries has been paid more and more attention, and has been widely used in power and communication industries. However, the key technology of on-line monitoring and condition assessment of storage batteries, i.e. internal resistance AC discharge method, is not well understood by people, and is still in the vague understanding. Because of the misleading word "maintenance-free", users relax the daily maintenance and management of storage batteries. Accidents in substations and power plants caused by insufficient or invalid capacity of batteries are common. Therefore, it is of great significance to use and maintain accumulator correctly and improve its service life.
The main factors affecting the internal resistance of batteries are: the main factors affecting the internal resistance of batteries are:
The use time of battery: With the increase of the use time, the factors such as electrolyte loss, corrosion of plate and connecting strip, sulfation of plate, plate deformation and active substance falling off, etc. result in the reduction of battery capacity and the increase of internal resistance of battery.
Battery charge: Because of the different depth of electrolyte injected into the battery, the thickness of reactant on the electrode surface and the porosity of the electrode surface, the internal resistance of the battery varies greatly, and the charge amount varies greatly.
Temperature: Changes in ambient temperature, such as rising, make it easier for the diffusion of reactive substances, charge transfer, electrode dynamics and material transfer to occur, thus reducing the internal resistance of batteries. On the contrary, it will increase.
Battery models: Different manufacturers, different types and different types of batteries, because of the different material formulations of electrodes, electrolytes and diaphragms, the different structure and assembly process of batteries make the internal resistance of batteries different.
Measuring Signal Frequency: At present, many battery internal resistance measurements actually measure the impedance of the battery, including capacitive reactance, and the magnitude of capacitive reactance is related to the frequency of the measured signal, so that the measurement results of battery internal resistance do not have objectivity. In order to be objective, the influence of battery capacitance on measurement results should be removed by analytic method according to the phase relationship between measured signal current and voltage, so that the measurement rate results are independent of signal measurement frequency, that is, the measurement results of internal resistance are unique at any measured signal frequency.
Measuring time and measuring current size: In the case of large measuring current, at the moment of applying measuring signal and closing measuring signal, because the establishment and stabilization of polarization is a changing process, different measuring current, different measuring time and polarization are different, so the measurement results of internal resistance of storage battery are not objective. In order to be objective, the internal resistance should be measured with small signal current as far as possible. According to the experiment, the measured current is less than or equal to 0.05C10 (of which C10 is the capacity of the battery at 10 hours discharge rate). )
Effect of Overcharging
Under the condition of long-term overcharge, the acidity near the positive electrode increases due to the oxygen evolution reaction of the positive electrode, the water is consumed and the H + increases, which leads to the acceleration of grid corrosion, the thinning of the grid, the acceleration of the corrosion of the battery, and the reduction of the battery capacity. At the same time, the increase of water loss will lead to the danger of battery drying up, thus affecting the battery life.
Effect of Overdischarge
Overdischarge of batteries mainly occurs after AC power failure, and the batteries supply power to the load for a long time. When the battery is over-discharged to its low or even zero voltage, a large amount of lead sulfate will be adsorbed to the surface of the battery cathode, resulting in "sulfation" of the battery cathode. Lead sulfate is an insulator. Its formation will have a great negative impact on the charging and discharging performance of the battery. Therefore, the more sulfates formed on the cathode, the greater the internal resistance of the battery, the worse the charging and discharging performance of the battery, and the shorter the service life of the battery.
|
|
Your Current Location：