What are the performance indices of lead-acid batteries?The performance index of the lead-acid battery is basically 6:
Open circuit voltage and working voltage
1.1 open circuit voltage
The battery voltage in the open state is referred to as an open circuit voltage. The open circuit voltage of the battery is equal to the poor electrode potential of the positive electrode of the battery and the electrode electrode potential.
1.2 operating voltage
The working voltage refers to the voltage displayed during the discharge process after the battery is turned on, but also known as the discharge voltage. The starting voltage of the battery discharge is called an initial voltage.
After the battery is on, the battery's operating voltage is lower than the open circuit voltage due to the presence of ohmic resistance and polarization over-potential.
2 capacity
The battery that the battery can be given under a certain discharge condition is referred to as the capacity of the battery, expressed in symbol C. Commonly used units are ampere hours, referred to as safety (AH) or mAh (MAH). The capacity of the battery can be divided into theoretical capacity, rated capacity, and actual capacity.
The theoretical capacity is the highest theoretical value calculated by the quality of the active substance in accordance with the law. In order to compare different series of batteries, common specific capacity concepts, namely the theoretical power supplied by unit volume or unit quality battery, in units of AH / 1 or AH / kg.
The actual capacity refers to the amount of electricity that the battery can output under certain conditions. It is equal to the product of the discharge current and the discharge time, the unit is AH, which is less than the theoretical capacity.
The rated capacity is also a guaranteed capacity, which is a standard promulgated according to the national or relevant department to ensure the lowest capacity of the battery to be released under certain discharge conditions.
3 energy
The energy of the battery refers to the electrical energy given by the battery in a certain discharge system, usually expressed as a wattage (WH).
The energy of the battery is divided into theoretical energy and actual energy. Theoretical energy w care the product of the theoretical capacity and the electric potential (E), namely
W 理 = C 理 E
The actual energy of the battery is the product of the actual capacity C in a certain discharge condition and the average operating voltage U flat product, ie
W is = C real u flat
Commonly used energy compared to compare different battery systems. Compared to energy refers to electrical energy output by battery unit or unit volume, the units are WH / KG or WH / L, respectively.
It is more equivalent to energy and actual than energy than energy. The former refers to the energy that the LKG battery reaction is completely discharged. The actual energy can be output by the actual energy of the LKG battery.
Due to the influence of various factors, the actual amount of the battery is much smaller than the theoretical ratio energy. The actual relationship between energy and theoretical than energy can be represented as follows:
W Rehe: W 理 · kV · Kr · KM
KV-voltage efficiency in the formula; KR-reaction efficiency; KM-mass efficiency.
Voltage efficiency refers to the ratio of the operating voltage of the battery and the electromotive force. When the battery is discharged, the operating voltage is less than the electric potential due to electrochemical polarization, concentration polarization and ohmic pressure drop.
Reaction traffic usage represents the utilization of active substances.
The specific energy of the battery is a comprehensive indicator, which reflects the quality level of the battery, which also shows the technical and management level of the manufacturer.
4 power and specific power
The battery's power means that the battery is given in a certain discharge system, and the size given in units of energy, in w (watt) or KW (kW). The power that the unit quality battery can be given is called a specific power, and the unit is w / kg or kW / kg. The specific power is also one of the important performance indicators of the battery. A battery is larger, indicating that it can withstand a large current discharge.
The battery is more energy and power performance is an important parameter when the battery selection is selected. Because the battery is to match each other with the equipment, the instrument, the electric machine, etc., in order to meet the requirements, the battery type must first be selected according to the power size of the electric device. Of course, it will eventually determine the type of quality, volume, more energy, temperature range and price of the temperature, and price of the use of the battery.
5 internal resistance
The internal resistance of the battery includes ohmic internal resistance and polarization internal resistance, and the polarized internal resistance includes electrochemical polarization and concentration. The presence of the internal resistance makes the end voltage at the time of the battery discharge than the battery electromotive force and the open circuit voltage, and the charging time voltage is higher than the electric potential and the open circuit voltage. The internal resistance of the battery is not a constant, continuously varies over time during the charge and discharge process, because the composition of the active material, the concentration of electrolyte, and constantly change.
Ohm resistors comply with Ohm's law; the polarization resistance increases with current density, but is not linear relationship, often with current density and temperature constantly changing.
6 battery life
Under the predetermined conditions, the effective life of a battery is called the battery life. The battery is short-oriented inside the battery, and the battery uses failure when the capacity does not meet the specification requirements, and the battery life is terminated. The service life of the battery includes the use period and the use cycle. The use period refers to the time of the battery, including the storage time of the battery. The use cycle refers to the number of times the battery is reused. Recommend: LiFePO4 Battery Manufacturer Energy storage battery Manufacturer Integrated machine energy storage battery series Manufacturer Lead lithium battery Manufacturer Outdoor Backup Battery Manufacturer Portable outdoor power supply Manufacturer Power battery Manufacturer Powerwall LiFePO4 Battery Manufacturer Battery rack Manufacturers Telecom LiFePO4 Battery Manufacturer Wall mounted battery storage Manufacturer China Lifepo4 Battery
