The difference between car starter battery and electric vehicle lithium power battery
The core technologies of electric vehicles are batteries, motors, electronic control, and then the chassis technology of traditional cars. The core problem of electric vehicles is the battery. For electric vehicles, the ideal battery should have sufficient energy density, sufficient power density, fast energy replenishment speed, and low average use cost. Many of my friends don’t know the difference between a car’s starting battery and a power battery. First of all, the purpose is different. The starting battery is used for car starting, and the lead-acid power battery for electric vehicles is used for the endurance of electric vehicles; then the battery plate material and discharge time , The electrolyte concentration is different, the following is a detailed introduction of the difference between the starter battery and the power battery, let's take a look.
1. Different application areas
1. The starting battery is used for car starting. It has strong instantaneous large-current discharge capability and weak endurance. It is a flooded battery.
Representative model: 6-QW-60 (550)
6-QW-60 (550) is the model standard of car starter battery, 6 refers to the number of cells of the battery, each cell is 2V, 6 cells total 12V; Q start-up battery, W maintenance-free battery; 60 is the rated capacity 60A/h ; 550 is -18℃ starting current 550A.
2. Lead-acid power batteries for electric vehicles are used in electric vehicles for endurance. They have strong deep discharge capability and weak high current discharge capability. They are lean-liquid batteries.
Representative model: 6-DZM-12
6-DZM-12 is the model standard for electric vehicle batteries. 6 refers to the number of cells of the battery, each cell is 2V, and 6 cells total 12V; DZM refers to the maintenance-free battery for electric power and mopeds, which is used for power, assistance, and free The first pinyin letter; 12 means that the rated capacity is 12 Ah.
Starting batteries are generally rich. Power batteries are generally lotus-free. The working nature of the starter battery is to discharge a high current in an instant, the larger one is 400-500A, while the power battery is a small current discharge, and the larger one is only 30A. The starting battery is not difficult to use, but the discharge current is large, and the plates are much softer.
The main feature of the starter battery is that the plate is thin, the number of sheets is large, which is good for high current start, and the discharge rate is 20 hours. The stroke battery is also a power battery, because it is mainly used for power, the electrode plate is thicker, suitable for current batteries, and the discharge rate is generally 3 or 5 hours. It should be lead-acid batteries.
Second, the battery plate material is different
Power battery plates are mostly lead-calcium alloy, and start-up batteries are mostly lead-antimony alloy.
Three, the discharge time is different
The power battery can be discharged with a small current for several hours, and the discharge depth is very deep. The starting battery discharge time is very short, but the instantaneous large current discharge ability is strong, and it runs with a large discharge current, several hundred amperes.
Fourth, the electrolyte concentration is different
In order to run farther, many people increase the electrolyte concentration of the power battery to 1.31. In fact, this way the battery is very easy to vulcanize and make the plates inactive. The standard concentration of electrolyte for starting the battery is 1.28, under which a larger discharge current can be obtained, which makes the car easy to start.
Five, the battery capacity is different
In the case of new batteries, use a discharge meter to test the battery capacity. Generally, the capacity of the power battery is about 1000-1500mAh; while the capacity of ordinary batteries is above 2000mAh, and some can reach 3400mAh.
Six, the discharge power is different
A 4200mAh power battery can discharge the power in just a few minutes, but ordinary batteries can't do it at all, so the discharge capacity of ordinary batteries is completely incomparable with power batteries. The biggest difference between a power battery and an ordinary battery is its large discharge power and high specific energy. Since the power battery is mainly used for vehicle energy supply, it has a higher discharge power than ordinary batteries.