Advantages of 26650 lithium iron phosphate battery

Advantages of 26650 lithium iron phosphate battery
High energy density: the theoretical specific capacity is 170mAh / g, and the actual specific capacity is ≥ 140 MAH / g (0.2C, 25 ° C);
High safety: the safest cathode material for lithium ion battery at present;
No pollution: it does not contain any heavy metal elements harmful to human body;
Long cycle life: it can charge and discharge more than 2000 times under the condition of 100% DOD;
Fast charging performance: lithium battery with lithium iron phosphate cathode material can be charged at a high rate.
Power to 0V. Observe the appearance change of the battery. Result: no fire, no explosion
3. External short circuit
After the standard charging of the battery, measure the initial state of the battery, place it in the explosion-proof cover and directly short-circuit its positive and negative electrodes (the total resistance of the line is not greater than 50m Ω). When the battery temperature drops to about 10 ℃ lower than the peak temperature, the test ends. Observe the temperature and appearance changes of the battery. Result: no fire, no explosion
4. Hot box test
Measure the initial state of the battery, place the battery in the oven after standard charging, raise the temperature to 130 ± 2 ℃ at the rate of (5 ± 2 ℃) / min and keep it for 30min. Observe the appearance change of the battery. Result: no fire, no explosion
5. Fall
Test the initial capacity of the battery. After standard charging, measure the initial state of the battery, and drop the test battery vertically and horizontally from the position with the height (the height of the lowest point) of 1m to the cement ground. It is required to drop twice. Result: no fire, no explosion
6. Heavy impact
Place a steel rod with a diameter of 15.8mm in the middle of the fully charged battery; Then drop the 10kg hammer from 1.0m to the upper part of the battery. Result: no fire, no explosion
7. Extrusion test
The electric core is placed between the two extrusion surfaces of the extrusion equipment. The cylindrical electric core shaft is parallel to the extrusion surface, gradually increase the pressure to 13kn and maintain the pressure for 1min. Result: no fire, no explosion
26650 lithium battery charging
1. Precautions for charging 26650 lithium battery
The basic requirements for charging 26650 lithium battery are specific charging voltage and charging current at each stage. Some additional auxiliary functions are added to improve the service life of the battery;
In order to ensure the stable and reliable operation of the battery and prevent the interference of transient voltage change, the delay circuit with overcharge, overdischarge and overcurrent protection shall be designed to prevent instability caused by transient interference;
The factors affecting the safe and effective charging of 26650 lithium battery include voltage, current and temperature. Therefore, these three factors should be taken into account and controlled in the charger design.
2. Can the 18650 battery charger charge the 26650 battery?
The 18650 lithium battery charger can be used to charge the 26650 lithium battery, but it should not be used for a long time. Because the voltage platform of the 18650 lithium battery charger is relatively high, the 18650 lithium battery voltage platform is 3.6V and 4.2V, and the 26650 lithium battery voltage platform is 3.2V and 3.6V. Therefore, long-term use will cause damage to 26650 lithium battery.
How to buy 26650 lithium battery?
26650 lithium battery is widely used in the fields of electric tools, lighting, solar energy storage, electric vehicles, toys, instruments and meters, UPS backup power supply, communication equipment, medical equipment and lamps. What should we pay attention to when purchasing 26650 lithium battery?
1. Appearance and production process
Look at the appearance refers to the appearance, workmanship, size and process of 26650 lithium battery. The advanced technology feels very comfortable. After polishing, the rubber oil polishing material has good hand feel and strong insulation performance.
2. Capacity identification
26650 lithium batteries without clearly marked capacity are likely to be garbage batteries reassembled with inferior battery cells or recycled battery cells. The market is full of many cheap 26650 lithium batteries. They are made of recycled battery cells or disassembled battery cells. Although the price is cheap, they have short service life and unstable quality. Careless use may damage the equipment and even explode.
3. With or without protective plate
The characteristics of 26650 lithium battery determine that the 26650 lithium battery must be equipped with a protective plate to prevent overcharge, over discharge and short circuit of 26650 lithium battery. The 26650 lithium battery without a protective plate will be in danger of deformation, liquid leakage and explosion. In the fierce price competition, battery packaging factories seek lower price protection circuits, or omit the device at all, making the market full of 26650 lithium batteries with explosion risk.
4. Flat and pointed
26650 lithium battery can be divided into flat head and pointed head. The difference between the two is that one with protective plate and the other without protective plate.
Flat head 26650 lithium battery: without protective plate.
Tip 26650 lithium battery: with protective plate, because the top of the protective plate protrudes, the protruding part is the protective plate.
In general, I recommend buying a pointed battery to ensure that it can be compatible with more devices and uses. Generally, the positive and negative poles of electric appliances are spring designed and can be retracted. Both pointed and flat head batteries can be used.
However, if the flat battery is to be used in series, the positive pole of the flat battery cannot contact the negative pole of the other battery.