Overview of lithium titanate battery
The lithium titanate battery is a lithium ion secondary battery which is composed of a lithium ion battery negative electrode material, lithium titanate, and can be composed of a positive electrode material such as lithium manganate, a ternary material or lithium iron phosphate to form a 2.4V or 1.9V lithium ion battery. In addition, it can also be used as a positive electrode, and a 1.5V lithium secondary battery is composed of a lithium metal or a lithium alloy negative electrode. It has high safety, high stability, long life and green environmental protection.
It is foreseeable that lithium titanate materials will become the anode material of a new generation of lithium-ion batteries after 2-3 years and are widely used in new energy vehicles, electric motorcycles and require high safety, high stability and long period. Application area. The lithium titanate battery operates at 2.4V, the highest voltage is 3.0V, and the charging current is greater than 2C ( twice the current of the battery capacity).
Lithium titanate battery life
The emergence of electric vehicles has solved the problem of serious urban environmental pollution invisibly. In order to meet the requirements of electric vehicles for batteries, it is hot and difficult to develop batteries with high safety, good rate performance, frequent cycle charge and discharge, and long service life.
On the selection of the battery, Ouli Road has comprehensively compared and analyzed, discarding the lead-acid battery with only 300 cycles of charge and discharge, and the ordinary lithium battery with 800-1000 cycles of charging and discharging, and finally selected the cycle charge and discharge times up to 20,000. 5,000 lithium titanate batteries.
The quality of the battery directly affects the driving distance and service life of the electric vehicle.
How to maintain lithium titanate battery
1. Avoid exposure.
If the temperature is too high, the internal pressure of the battery will increase directly, so that the battery pressure limiting valve will be forced to open automatically, which directly causes the battery to lose water. The consequence of excessive water loss of the battery is to reduce the battery activity, accelerate the softening of the plate, and cause charging when charging. The casing is damaged by heat, drumming, deformation, and the like.
2. Master the charging time while charging.
Charging time should be based on the usual frequency of use and mileage. If it is a shallow discharge, that is, the mileage after charging is very short, the battery will soon be full, and overcharging will occur when charging continues, resulting in battery heating, water loss, and reduced service life.
3. Regular inspections.
If the cruising range of the electric vehicle suddenly drops by more than ten kilometers in a short period of time, it is very likely that at least one of the batteries in the battery pack has a broken grid, softened plates, and active material falling off the plates. Once this problem occurs, you should promptly go to a professional battery repair facility for inspection, repair or matching.
In general, the life of the battery can be maintained for about 3 years, and the maintenance can last for 5 years.
Further reading: How to maintain electric vehicles
1. Correctly master the charging time
In the process of use, you should accurately grasp the charging time according to the actual situation, and refer to the usual use frequency and mileage to grasp the charging frequency. During normal driving, if the red and yellow lights indicate that the red and yellow lights are on, they should be charged. If only the red light is on, stop running and charge as soon as possible. Otherwise, excessive battery discharge will seriously shorten the life. When the battery is fully charged, the charging time is short, and the charging time should not be too long. Otherwise, overcharging will occur and the battery will be heated. Overcharging, overdischarging, and undercharging can shorten battery life. In general, the average charging time of the battery is about 10 hours. Charging process, such as battery temperature exceeds 65 ° C, should stop charging.
2.Protect the charger
The general instructions for use have instructions for protecting the charger. Many users do not have the habit of reading the manual. They often think of looking for the manual after the problem. It is often too late, so it is very necessary to read the manual first. In order to reduce the cost, the current chargers basically do not have a high vibration-resistant design, so that the charger is generally not placed in the trunk and basket of the electric bicycle. In special cases, it must be moved, and the charger should be packaged in foam to prevent bumps. After many chargers are vibrated, their internal potentiometers will drift, causing the entire parameters to drift, resulting in an abnormal state of charge. Another thing to note is that the charger should be kept ventilated during charging. Otherwise, it will not only affect the life of the charger, but also cause thermal drift and affect the state of charge. This will cause damage to the battery. Therefore, it is very important to protect the charger.
3.Regular deep discharge
Regular periodic discharge of the battery also facilitates "activation" of the battery and can slightly increase the capacity of the battery. The general method is to periodically discharge the battery completely. The method of full discharge is to ride to the first undervoltage protection under normal load conditions on a flat road. Note that we especially emphasize the first undervoltage protection. After the battery is under the first undervoltage protection, after a period of time, the voltage will rise and return to the non-undervoltage state. If the battery is used again, the battery will be seriously damaged. After the complete discharge is completed, the battery is fully charged. Will feel the battery capacity has improved.
4.Avoid plugging when charging
The 220 volt power plug or charger output plug is loose, the contact surface is oxidized, etc., which will cause the plug to heat up. If the heating time is too long, the plug will be short-circuited or poorly contacted, which will damage the charger and the battery and cause unnecessary loss. Therefore, when the above situation is found, the oxide should be removed or the connector replaced.
5.Charging every day
Even if your continuation ability is not long, you can use it for 2 to 3 days, but it is recommended that you charge every day, so that the battery is in a shallow cycle and the battery life will be extended. Some early-use mobile phone users think that the battery is best recharged after basic use, this view is wrong, the memory efficiency of lead-acid batteries is not so strong. Frequent discharge of electricity has a greater impact on the life of the battery. Most chargers may charge 97% to 99% of the battery after the indicator light is fully charged. Although only undercharged 1% to 3% of the power, the impact on the continuation ability is almost negligible, but it will also form undercharge accumulation, so after the battery is fully charged, it will continue to float as much as possible, to suppress battery vulcanization. beneficial.
6. It is strictly forbidden to lose electricity when storing
The battery must not be in a deficient state when it is stored. The deficient state means that the battery is not charged in time after use. When the battery is stored in a depleted state, sulfation is likely to occur, and the lead sulfate crystals adhere to the electrode plate, which may block the ion channel, resulting in insufficient charging and a decrease in battery capacity. The longer the idle state is idle, the more severe the battery is damaged. Therefore, when the battery is not in use, it should be replenished once a month, which can better maintain the health of the battery.
7. Avoid large current discharge
When the electric car starts, carries people, and goes uphill, try to avoid slamming and accelerating, forming an instantaneous large current discharge. High current discharges tend to cause the formation of lead sulfate crystals, which impair the physical properties of the battery plates.