Lead acid battery is a very complex chemical reaction system. External factors such as the size of the charge and discharge current and its working temperature can affect the performance of the battery. Calculating the SOC value of the battery and determining the operating mode of the vehicle according to its running state and other parameters is a key technology of electric vehicles.
Lead-acid battery has the longest history of application, and is the most mature, cost and price of the lowest battery, has achieved mass production. But it is lower than energy, higher self-discharge rate and lower cycle life. The main problem is the short trip of one charge. Recently developed third generation cylindrical sealed lead-acid batteries and the fourth generation TMF (foil rolled electrode) sealed lead-acid batteries have been used in EV and HEV electric vehicles. In particular, the low impedance of the third generation VRLA battery can control the ohmic heat during the rapid charging process and extend the battery life.
The pulse phased constant current quick charging method can well adapt to the requirements of the hybrid electric vehicle lead-acid battery in the state of transformation and transportation, and the charging time is short, so that the SOC of the charged state of the battery is always kept in the range of 50%-80%. Tests show that it takes only 196 seconds to charge the battery from 50% C to 80% C. This charging method basically meets the acceptance curve of the battery. The temperature rise of the battery is small, the gas generation is small, the pressure effect is small, and the charging time is short.
The optimal charging method is that the charging current always follows the inherent charging receiving curve. During the charging process, the charging acceptance rate remains unchanged. With the increase of time, the charging current decreases according to the intrinsic charging receiving curve (exponential curve decreases), so the charging time is the shortest. Pulse depolarization charging method can realize fast and efficient charging, but the equipment is expensive and not suitable for some batteries.
The new VRLA battery for electric vehicles developed by Japanese company has a voltage specification of monomer 2V and 4V, and adopts lean liquid type and plate level design. The spacing between rice plates is very small, so there will be no electrolyte stratification, the shedding material will move down to be blocked by plates, and there will be no debris accumulation at the bottom of the battery.
Ectreosorce company's 12 v l12A h. battery electric vehicles use level, the rate of discharge in 3 hours quality than the energy for the 50 w · 11 / kg, 80% Ⅸ) D (depth of discharge) the cycle life of more than 900 times.
The lead-acid batteries used in the electric vehicles of Germany sunshine company are designed with colloidal electrolyte, and the expected life of its 6V and 160A·h batteries can reach 4 years after testing, which has the advantages of large thermal capacity and small temperature rise.
Arias launched its lead-acid battery for dual-polarity electric vehicles in 1994. The working current of the battery passes through thin double electrodes perpendicular to the electrode plane, so it has minimal ohm resistance. The technical parameters of lead-acid battery for bipolar electric vehicle developed by BPC are: the combined voltage is 180V, the battery capacity is 60A·h, the discharge rate/energy is 50W·h/kg, and the cycle life can be up to 1000 times.
Lead acid battery for rolling electric vehicle launched by Sweden OPTLMA company has a product capacity of 56A·h, and the starting power can reach 95kW, which is larger than the ordinary VRLA battery of 195A·h, and the volume is less than a quarter.
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