Battery (battery) refers to a cup, tank or other container or part of the space of a composite container that contains an electrolyte solution and metal electrodes to generate current. With the advancement of technology, batteries generally refer to small devices that can generate electrical energy. Such as solar cells. The performance parameters of the battery mainly include electromotive force, capacity, specific energy and resistance.
(1) The open circuit voltage of the battery
(2) The internal resistance of the battery
(3) The working voltage of the battery
(4) Charging voltage
Charging voltage refers to the voltage applied to both ends of the battery by an external power source when the secondary battery is being charged. The basic charging methods include constant current charging and constant voltage charging. Generally, constant current charging is used, and its characteristic is that the charging current is constant during the charging process. As the charging progresses, the active material is recovered, the electrode reaction area continues to shrink, and the polarization of the motor gradually increases.
(5) Battery capacity
Battery capacity refers to the amount of power obtained from the battery. It is usually represented by C, and the unit is usually represented by Ah or mAh. Capacity is an important indicator of battery electrical performance. The capacity of the battery is usually divided into theoretical capacity, actual capacity and rated capacity.
The capacity of the battery is determined by the capacity of the electrodes. If the capacity of the electrodes is not equal, the capacity of the battery depends on the electrode with the smaller capacity, but it is never the sum of the positive and negative capacities.
(6) The storage performance and life of the battery
One of the main features of a chemical power source is that it can release electrical energy when in use and store electrical energy when not in use. The so-called storage performance is the charge retention capability for secondary batteries.
For secondary batteries, the service life is an important parameter to measure the performance of the battery. The secondary battery is charged and discharged once, which is called a cycle (or cycle). Under a certain charging and discharging system, the number of charging and discharging times that the battery can withstand before the battery capacity reaches a certain specified value is called the service cycle of the secondary battery.
