:) The lifespan of a lithium battery is calculated based on charge cycles, which are usually several thousand cycles.
Charging from 100% to 100% discharge is one cycle, charging and discharging 1% each time 100 times is also one cycle.
Therefore, repeated short-term charging and discharging will eventually affect the number of charging and discharging times and battery life. The most obvious impact is that during normal use in the future, it will be fully utilized. Charged very quickly, but the battery life will be short, that is, very quickly there is no power.
Why do lithium batteries drain quickly when fully charged?
Theoretically, lithium batteries charge faster than lead acid batteries due to the high activity of lithium. . But it is not recommended to use afast charging. Fast charging will not have enough power as slow charging. And fast charging damages the battery.
The allowed charging current of lithium batteries can be a little higher than that of lead-acid batteries (for example, the maximum allowed is 1C), usually 0.2-0.4C is chosen (lithium batteries for electric vehicles generally choose 0.2c).
Detailed information:
Once the lithium battery cell is overcharged to a voltage higher than 4.2V, it will start to produce side effects. The higher the overload voltage, the higher the risk. Once the lithium battery cell voltage is higher than 4.2V, the number of lithium atoms remaining in the positive electrode material is less than half. At this time, the storage cells collapseoften, resulting in permanent loss of battery capacity. ?
If charging continues, since the storage compartment of the negative electrode has been filled with lithium atoms, subsequent lithium metal will accumulate on the surface of the negative electrode material. These lithium atoms will grow dendrites from the surface of the negative electrode towards the lithium ions.
These metallic lithium crystals will pass through the separator and short-circuit the positive and negative electrodes. Sometimes the battery explodes before a short circuit occurs. This is because during the overcharging process, the electrolyte and other materials break down to produce gas, causing the battery shell or pressure valve to swell and rupture, allowing oxygen to escape. enter and react with lithium. The atoms accumulated on the surface of the negative electrode thus explode.
What is thedifference between fast charging and slow charging of car lithium batteries on the road?
If it charges quickly, it can be virtual power. The current charging method is normal. The ship is expected to be saturated in 4 hours.
To test the mobile phone, you must first change the charger to confirm whether the battery is normal. Use another charger to charge normally for 4 hours and put it into the mobile phone. runs out of power after a while, it will turn off, the battery may be broken. If the sleep mode is normal but the battery chart fluctuates, it may be a problem with the cell phone. If it operates normally during normal charging time, there is no need to repair it.
Note
Lithium batteries are durable goods and do not need to be equipped with expensive original chargers. Generally, a loadOrdinary branded eur will suffice and the price is 15-20 yuan. , eliminating the need to rely on mobile phones for direct charging system. There is fast charging (around 2-3 hours) and slow charging (around 10 hours). If you have more batteries, it is better to choose fast charging.
In addition, due to the characteristics of lithium batteries, discharging and overcharging operations are not necessary. Battery life depends entirely on actual charging time. That is, even if you only use half and start charging, it will have no impact on battery life.
When new energy vehicles use charging batteries for energy supply, they can be divided into DC fast charging according to charging power and time load, as well as the type of output current. of the charging pile. There arethem charging methods: AC slow charging and AC slow charging. So, what are the differences between these two charging methods?
What is the difference between fast charging and slow charging?
Fast charging refers to high-power DC charging. It uses the charging interface of the DC charging pile to convert the alternating current of the power grid into direct current and transports it to the fast charging port of the electric vehicle. Electrical energy goes directly into the battery for charging. It can be charged to 80% in just half an hour.
Slow charging refers to mains charging. This is an AC charging pile charging interface. It feeds AC power from the power grid into the trickle charging port of the electric vehicle, converts the AC power into DC power through the charger inside the car, and then feeds it into the battery to complete the charge.arge. An average car model takes 6-8 hours to fully charge the battery.
The respective advantages and disadvantages of fast charging and slow charging
Advantages of fast charging:
The occupation time is short and the DC charging voltage is generally higher than the battery voltage, the AC power needs to be converted to DC power through a rectifier, which imposes higher requirements on the voltage resistance and safety of the battery. food.
Disadvantages of fast charging:
Fast charging will use greater current and power, which will have a significant impact on the battery. Charging too fast will result in empty power consumption. Fast charging mode is much more important than slow charging mode. The high temperature generated will directly cause accelerated aging inside the battery, significantly shorteningement battery life. In severe cases, this will cause frequent battery failures.
Benefits of slow charging:
Charge the device battery at a lower speed with almost no empty energy. In addition, the charging current of slow charging is generally less than 10 amps, and the maximum power is 2.2 kilowatts, which is several times lower than the 16 kilowatts of fast charging. This can not only reduce battery heat and pressure, but also help extend charging. battery life.
Disadvantages of slow charging:
Charging time is long and it often takes several hours to fully charge a depleted battery.
The two methods of charging new energy vehicles have their own advantages and disadvantages. For purely electric vehicles, battery maintenance costs are relatively high. By coTherefore, it is recommended that when using the charging mode, you try to use slow charging as the main method and fast charging as a supplement, in order to maximize battery life.