The 75 Ah iron-lithium battery has a capacity of 81 ~ 84 Ah left at about 0 degrees.
When fully charged, it should be between 81 and 84 volts. Generally, the fully charged voltage of a 12V battery is 13.5-14.0V. Different manufacturers have different voltages. The lithium battery is only about 90 when fully charged. It becomes 82 when turned on and drops to 80 after a few hundred meters. The lifespan of lithium iron phosphate battery can reach more than 2000 times, but we always calculate the lifespan at 80%, or 1600 times, which will decrease to about 5%.
The working principle of lithium-iron battery:
The internal structure of LiFePO4 battery: on the left is LiFePO4 with olivine structure like positive electrode of the battery, made of aluminum foil and battery. The positive electrodeis connected to a polymer separator in the middle.
It separates the positive electrode from the negative electrode, but lithium Li+ ions can pass through but e- electrons cannot. On the right is the negative electrode of the battery made of carbon (graphite), which is connected to the negative electrode. Negative electrode of the battery by copper foil. Between the upper and lower ends of the battery is the battery electrolyte, and the battery is sealed by a metal casing.
When the LiFePO4 battery is charging, the lithium Li+ ions from the positive electrode migrate to the negative electrode through the polymer separator; during the discharge process, lithium Li+ ions from the negative electrode migrate to the positive electrode; through the separator. Lithium-ion batteries get their name because lithium ions migrate back and forth during charging and discharging.
Lacis it better and more durable, a lead acid battery or a lithium battery in winter?
Electric vehicle batteries cost around 300 yuan and are durable. If you buy a set of ordinary electric vehicle batteries, the price will generally be between 300 and 800. If it is a higher quality battery, the price will basically be more than 1,000. Therefore, if you always spend a lot of money to buy batteries, it's best to take good care of the battery you are currently using. When the battery is no longer usable, you can spend mid or high price to buy a better battery. . Since the life of a good battery is relatively long, the price of frequent battery replacement is not much different from that of prolonged use of a good battery.
Lithium battery.
Given qSince the lead acid battery contains electrolyte, it is not very useful in cold winter weather and the stored power will decrease. It's easy to run out of energy or cause loss. of power, making it difficult or impossible to start the car. However, relatively speaking, lithium batteries have greater adaptability to high and low temperatures, are less affected by temperature factors, and are more durable in winter. However, all batteries are prone to power loss in low temperature environments and are not as durable as in summer, but lithium batteries lose less power.
Precautions for using lithium batteries
To charge lithium-ion batteries, a dedicated lithium-ion battery charger should be used. Lithium-ion battery charging adopts CC/CV (.constant current + constant current) method, that is, chargingfirst with constant current, when the voltage reaches 4.2V*n. Switch to constant voltage charging until charging stops when the current reduces to 0.01C.
Lithium-ion batteries can be stored in a clean, dry, ventilated room with an ambient temperature of -5°C to 35°C and relative humidity not exceeding 75%. should be avoided and kept away from fire source and heat source. The battery power remains between 30 and 50% of the nominal capacity. It is recommended to recharge stored batteries every 6 months.