Judge the quality of lithium batteries
1. Look at the cells
Most of the cells used in lithium batteries are soft-pack cells and 18650 cells first. check if the battery core is new, because there are cases of unscrupulous small workshops using second-hand battery cells to make lithium batteries.
Soft-packaged lithium battery, also known as polymer battery, is a soft-packaged battery containing a gel-type electrolyte that can be made into different shapes. The battery has high safety and will not explode. 18650, the electrolyte is in liquid state and has a large capacity, up to 3000 mAh, but it can explode and has a low safety factor.
2. Look at the weight
The weight of lithium batteries is directly proportional to the capacity. If it is a lithium polymer battery, if the difference ine weight is too large, the capacity. will certainly be insufficient. But some batteries have different capacities, so it's hard to tell, so it's better to find lithium battery manufacturers with a better reputation. In the battery industry, in order to reduce costs, many people use poor quality cells and protection boards. so be careful when buying to avoid making a mistake.
Advantages of lithium batteries:
1. It has a high storage energy density, reaching 460-600 Wh/kg, about 6-7 times that of lead-acid batteries.
2. Long service life, service life can reach more than 6 years. The battery with lithium iron phosphate as the positive electrode has a charge and discharge record of 1C (100% DOD), which can be used 10,000 times.
3. The rated voltage is high (the operating voltage of asingle unit is 3.7 V or 3.2 V), which is approximately equal to the series voltage of three rechargeable nickel-cadmium or nickel-metal hydride batteries. , which facilitates the formation of a battery power supply; Lithium batteries can be a new type of lithium battery voltage regulator technology that adjusts the voltage to 3.0V to adapt to the use of small electrical appliances.
4. She has high power endurance. Among them, the lithium-ion iron phosphate battery used in electric vehicles can achieve a charge and discharge capacity of 15-30°C, making it easier to start and accelerate at high current. .
5. The self-discharge rate is very low, which is one of the most important advantages of this battery. It can generally be less than 1%/month, or less than 1/20 of it. nickel-metal hydride batteries.
6. Lightweight, theweight is about 1/6 to 1/5 of lead products in the same volume.
7. It has strong adaptability to high and low temperatures and can be used in the environment of -20℃ to 60℃. After treatment, it can be used in -45℃ environment.
8. Green and environmentally friendly, regardless of production, use or disposal, it does not contain or produce toxic and harmful heavy metal elements and substances such as lead, mercury and cadmium .
Reference for the above content: Baidu Encyclopedia - Lithium Battery
The weight difference is very large. The 72V lead acid battery is composed of 6 sets of batteries. , which cannot be recovered in one go. Lithium batteries can be easily lifted. The total mileage is not enough, mainly because the battery capacity has decreased due to loss, or it may consumeThe motor's energy consumption has increased due to demagnetization and it cannot operate for a long time. I bought it several years ago. After using the lithium battery twice, the effect was terrible, and more than 2,000 yuan was spent in vain.