Lithium battery principle and production process
Lithium batteries are closely related to our lives in smart phones, laptops, electric cars in big cities, and lithium batteries.
The working principle of lithium battery is that lithium ions move in and out of the positive and negative electrodes, forming a charge and discharge function. Its entire production process is roughly as follows:
The agricultural plant protection battery has been updated for three generations. The first generation of agricultural plant protection battery was born out of the model battery. The structure is relatively simple, and many problems are easy to occur during use. The second generation battery adds real-time communication function with the flight control, but it is prone to new and old. The problem of using the battery together. The third generation of batteries has greatly improved the corrosion and anti-dropping of pesticides.
Common battery problems and causes
Through our collation, it is found that the fall of agricultural plant protection battery accounts for the largest proportion of battery damage, which can reach 90%. The next step is plug burn, battery corrosion or water ingress, mixing of old and new batteries. In addition, everyone should avoid high-current fast charging as much as possible, otherwise the battery life will be shorter.
Battery flatulence is an external manifestation of battery damage. At this time, the battery cannot be used. It is usually caused by the following reasons:
There are four reasons for battery charging or long charging time: welding solder joint, internal resistance is large; protection board is faulty; single cell voltage difference in battery pack is too large or zero electricity occurs; charger failure.
Battery ignition is our biggest concern and the most harmful problem. Most of the fires occur during the charging process. Overcharge, battery puncturing, impact deformation, internal and external short circuit can cause fire.
Let's look at two fire cases:
Safety precautions
Let's start with a question that everyone can easily ignore. Most people basically receive the battery through express delivery logistics. After signing, they must check whether the appearance of the battery is damaged or not, and whether there is crushing deformation. Otherwise, it may cause disputes with the manufacturer when defending rights.
Then, you need to check the battery voltage before use to see if it is within the normal range of use. The normal range is as follows:
When the plant protection drone battery is charged, there are certain requirements for external temperature, current and appearance damage. Please refer to the following figure for details:
The plant protection drone battery often needs to change when it is used. It needs to do the measures such as filling and anti-collision to avoid the battery from being struck by violent collision. If any abnormal condition of the battery is found, it must be isolated.
Due to the nature of agricultural plant protection, there are several special points of attention for summer and winter use. In the winter, you must charge indoors, keep the battery warm, and the actual flight temperature should be at least 10 degrees. After the low battery alarm, you should return immediately.
Summer notes are more complicated, please refer to these two pictures:
Warehousing considerations
There are certain requirements for the design and handling of the battery warehouse. There are some precautions for temperature, fire prevention, exhaust system and humidity.
The consequences of battery fire are very serious, and the fire-fighting method also has certain attention. When the polymer battery is on fire, it is necessary to cut off the power of the equipment first, cover the burning of the lithium battery with asbestos blanket, and use the fire sand to isolate the air, and avoid using dry powder to extinguish.
Disposal of waste batteries
First of all, we must learn to identify scrapped batteries, which can generally be identified from four aspects:
After the identification is completed, the battery needs to be stored separately and isolated. Then, according to the ratio of 1:20 salt water, the battery is placed in the brine for 2 hours, and no more than 3 groups at a time to complete the discharge. If conditions permit, contact an organization that has battery processing qualifications for processing.
In addition to lithium batteries, other batteries are highly polluted, so whether it is buried in the ground or even burned with fire, it not only harms the environment but also has safety hazards.
question Time
1. What is the maximum capacity of the plant protection battery?
The capacity of the battery is proportional to the size and weight, but the heavier the battery, the greater the kinetic energy required by the aircraft, so there is a trade-off between the actual design and the weight and battery capacity that the drone can bear. To achieve a balance, we can now achieve a maximum single-chip battery can reach 30,000 mA.
2. When the battery is charging, must someone watch it?
Today's smart batteries have overcharge protection, but from the perspective of risk management, there must be prevention. The hazard caused by charging fire is very large. Once the protection board fails, it can be dealt with immediately, so when charging Need someone to look after.
3.P20 battery is wet by the rain, how to deal with it in time?
First of all, to confirm whether the water is infiltrated, whether the battery is hot, P20's waterproof function is very good, as long as it is not in the water, there will be no major problems, you can check whether the charging is normal, if the battery appears more serious fever If it is a short circuit, you should cut off the power immediately.
4. In the northeast, the temperature of the winter warehouse is below 0 degrees. Is it not necessary?
It's just that the storage problem is not big, but before using it, be sure to let the battery body temperature reach at least 10 degrees before charging.
5. Is the drone battery used for single charging or parallel charging?
Parallel charging has certain risks. If the battery voltages of the two groups are different, the high-voltage battery will charge to a low voltage. It is very dangerous to discharge while charging. Therefore, parallel charging is not recommended.
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