Battery types and characteristics

Trimis la data: 2014-12-02 Materia: Mecanica Nivel: Facultate Pagini: 3 Nota: / 10 Downloads: 0
Autor: Mihaela_M Dimensiune: 22kb Voturi: Tipul fisierelor: doc Acorda si tu o nota acestui referat: 1 2 3 4 5 6 7 8 9 10
vezi mai multe detalii vezi mai putine detalii
Raporteaza o eroare
The function of the battery in a HEV may be varied. The battery may be a major power source, or may be used in conjuction with the primary power source(s) to level out the supply of power to the drivetrain. As a consequence, the amount of battery power aboard a HEV may vary between a single battery to a pack of many batteries connected together. When using batteries as a primary source of power, the HEV designer becomes concerned with the mass and volume of the battery pack required to meet the power and energy needs of the vehicle. The drive to achieve high power and energy densities have led the HEV community to investigate many types of batteries. These new battery types also promise greater cycle depth, power and energy capacity.

• CAPACITY: The battery capacity is a measure of how much energy the battery can store. Batteries do not simply serve as a bucket into which one dumps electricity and later extracts it. The amount of energy that can be extracted from a fully charged battery, for instance, depends on temperature, the rate of discharge, battery age, and battery type. Consequently it is difficult to specify a battery's capacity with a single number. There are primarily three ratings that are used to specify the capacity of a battery:

Ampere-hour: The Amphere-hour (Ah) denotes the current at which a battery can discharge at a constant rate over a specified length of time. For SLI (starting-lighting-ignition) batteries that are commonly used in cars, the standard is to specify Ampere-hours for a 20 hours discharge. This standard is denoted by the nomenclature of C/20. A 60 Ah C/20 battery will produce 60 Ah for a 20 hour discharge. This means that the new and fully charged battery will produce 3 Amps for 20 hours - it does not mean that the battery can produce 6 Amps for 10 hours (that would be signified by a C/10 60 Ah rating).

Reserve Capacity: The reserve capacity denotes the length of time, in minutes, that a battery can produce a specified level of discharge. A value of 35 minutes at 25 Amps for the reserve capacity for a battery means that the fully charged battery can produce 25 Amps for 35 minutes.
kWh Capacity: The kWh capacity metric is a measure of the energy (Volt * Amps * Time) required to fully charge a depleted battery. A depleted battery is usually not a fully discharged battery; a 12 V car battery is considered depleted when its voltage drops to 10.5 V. Similarly, a 6V battery is usually considered depleted when its voltage drops to 5.25 V.

None of these capacity ratings completely describe the capacity of a battery. Each one is a measure of the capacity under specific conditions. The performance of a battery in an actual application may vary substantially due to different discharge/recharge rates, battery age, cycle history, and/or temperature.

  • pag. 1
  • pag. 2
  • pag. 3

Nota explicativa
Referatele si lucrarile oferite de au scop educativ si orientativ pentru cercetare academica.

Iti recomandam ca referatele pe care le downloadezi de pe site sa le utilizezi doar ca sursa de inspiratie sau ca resurse educationale pentru conceperea unui referat nou, propriu si original. te invata cum sa faci o lucrare de nota 10!
Linkuri utile
Programeaza-te online la salonul favorit Descarca gratuit aplicatiile pentru iOS si Android Materiale educative Jocuri Cele mai tari jocuri de pe net Referate scoala Resurse, lucrari, referate materiale pentru lucrari de nota 10
Toate imaginile, textele sau alte materiale prezentate pe site sunt proprietatea fiind interzisa reproducerea integrala sau partiala a continutului acestui site pe alte siteuri sau in orice alta forma fara acordul scris al Va rugam sa consultati Termenii si conditiile de utilizare a site-ului. Informati-va despre Politica de confidentialitate. Daca aveti intrebari sau sugestii care pot ajuta la dezvoltarea site-ului va rugam sa ne scrieti la adresa