Not the same.
1. The weight is different. Lead-acid batteries are heavy, and the weight is 3-5 times that of lithium batteries of the same capacity.
2. Lead acid batteries are large. With the same capacity, the volume is 1.5 times that of lithium batteries.
3. Lead-acid batteries are more stable than lithium batteries.
4. The lifespan of lead-acid batteries is 1-2 years and that of lithium batteries is 3-5 years.
5. The number of cycles of lead-acid batteries is about 350 times, and that of lithium batteries is about 500 to 1,000 times.
6. The price of lead-acid batteries is one-third that of lithium batteries.
7. Lead-acid batteries charge slowly, while lithium batteries charge quickly.
Comparison of energy density of lithium batteries and energy of lead acid batteries. In comparison, beatsLithium batteries have higher energy density, lead acid batteries are 30WH/KG and lithium batteries are 110WH/KG. The biggest advantage of lithium batteries is that they have relatively high energy and high storage energy density, which has reached 460-600 Wh/kg, about 6-7 times that of lead-acid batteries.
Comparison of energy density of lithium batteries and lead acid batteries
Energy density refers to the energy released by the battery per unit mass or of volume, that is to say the volume ratio Energy or mass energy ratio. The energy density value of lithium batteries reflects the relationship between the battery energy size and the size: energy density ρ = E/V. The greater the energy density of the battery, the smaller the size of the battery with the same energy. Or, for the same size, the greater the energy density of the batteryis greater, the greater the battery energy.
Whether it is volume or weight specific energy, lithium batteries are more than 3 times higher than lead acid batteries. Lithium batteries are smaller and lighter. Long life expectancy. The lifespan of lithium batteries used in electric vehicles is typically more than 800 times longer. Lithium batteries using lithium iron phosphate cathode materials can reach about 2,000 times, which is 1.5-5 times longer than lead-acid batteries.
The current energy density of lithium batteries is generally 200-260 wh/g, and lead battery is generally 50-70 wh/g. The weight energy density of lithium batteries is therefore 3 to 5 times higher than that of lead. -acid, which means that with the same capacity, lead-acid batteries are 3-5 times larger than lithium batteries, beats themLithium teries therefore have an absolute advantage in lightweighting energy storage devices.
Lithium batteries have relatively high energy. It has high storage energy density, currently the highest has reached 460Wh/kg, about 5-10 times that of lead-acid batteries, and may be higher in the future (specific energy refers to energy per unit weight or unit volume, the specific energy is expressed in Wh/kg or Wh/L.) With the development of lithium battery safety technology, the use of lithium batteries will become more safe and more popular.
Generally, under the same volume, the energy density of lithium-ion batteries is 2.5 times that of nickel-cadmium batteries and 1.8 times that of nickel-metal hydride batteries. Therefore, when the battery capacity is equal. , the energy density of lithium-ion batteries will be higher than that of batteries nickel-cadmium and nickel-metal hydride which are smaller and lighter.
Currently, BYD's lithium iron phosphate battery has a single energy density of 150 Wh, and BYD plans to continue to increase the energy density to 160 Wh. In addition to lithium iron phosphate batteries, BYD is also simultaneously developing ternary lithium batteries. If ternary lithium battery technology is combined with lithium iron phosphate batteries and some adjustments are made to the initial use of graphite as an anode material, then around 2020, BYD plans to increase the unique energy density of lithium iron phosphate batteries at 200 Wh.
The energy density of lead-acid batteries is relatively low, so they cannot be used as a power source for electric vehicles, because if a lead-acid battery is used to drive a family car on more of 200 km, itwill take almost a ton of batteries. This weight is too big to be practical. Of course, lead poisoning is also a factor. The cycle performance of lead-acid batteries is also relatively poor. Energy density alone may determine that lead-acid batteries cannot be used as a pure energy source for electric vehicles.
Traditional lead-acid batteries have low energy density by mass and volume. The energy density is only about 1/3 that of lithium-ion batteries and about half that of nickel-hydrogen batteries. size and are not suitable for use when the weight is light and the volume is small. Traditional lead-acid batteries have a short lifespan and theoretical cycle times are about 1/3 those of lithium-ion batteries.
In order to highlight the long life of the batteries and the performance of theirs products, many lithium battery manufacturers often use battery energy density as an advertising gimmick. At present, the energy density of ternary lithium batteries with higher energy density is only 200 mAh/g. Currently, improving energy density is limited to increasing battery size. It will take a long time to achieve qualitative change through changes in the chemical system.