What should be paid attention to when customizing polymer lithium battery?
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Update time : 2021-09-09 09:23:45
According to different electrolyte materials used in lithium-ion batteries, lithium-ion batteries can be divided into two categories: liquid lithium-ion batteries (referred to as LIB) and polymer lithium-ion batteries (referred to as LIP). The positive and negative materials used in polymer lithium-ion batteries are the same as liquid lithium ions. The positive electrode materials can be divided into lithium cobalt oxide, lithium manganate, ternary materials and lithium iron phosphate materials. The negative electrode is graphite. The working principle of the battery Also basically the same.
The main difference between them lies in the difference in electrolytes. Liquid lithium-ion batteries use liquid electrolytes, while polymer lithium-ion batteries use solid polymer electrolytes instead. This polymer can be "dry" or " "Colloid", currently most of the use of polymer gel electrolyte.
1. Prohibit battery short circuit to avoid battery short circuit. A short circuit will generate a high current and cause the battery to heat up and electrolyte leakage, which is very dangerous to produce corrosive gas or explode. The pole piece is connected to the surface of a conductive object and it is easy to short-circuit. An external short-circuit will cause heat and damage the battery. Choose an appropriate protection circuit to protect the battery in the event of an accidental short-circuit.
2. Mechanical shock, drop, collision, bending, etc. may reduce the performance of the battery.
3. Precautions for pole piece operation, the mechanical strength of the pole piece is not exceptionally strong, especially the aluminum piece. It is forbidden to bend the pole piece when it is not necessary. 4. Precautions for the design of the battery case. Case toughness. The battery case should have sufficient mechanical strength to protect the battery from mechanical impact. To fix the battery, the side with the largest area of the battery should be fixed on the external charger, and the paste should be firm, and the battery should not be loose after installation.
4. The internal design of the shell-there should be no sharp edges on the part where the battery is installed in the shell, and it is not allowed to pierce the battery package.
5. Pole piece connection (try not to do this operation, and be careful not to short-circuit D. It is recommended to use ultrasonic or spot welding welding method: the shell design should make the pole piece free from external force. If you use manual welding to protect the plate, the following precautions are for ensuring the battery Performance is very important:
The temperature of soldering ferrochrome must be controllable and anti-static: the temperature of ferrochrome during soldering cannot exceed 350C: the soldering time cannot exceed 3 seconds: the number of soldering cannot exceed 5 times, and the next soldering can be performed after the pole pieces are cooled: strictly forbidden Heating the cell directly, higher than S0C will damage the cell.
6. In response to accidents (the battery has an outer packaging damaged, the battery should not be used when it leaks). When an accident occurs, the external charging design should consider that it will not heat even when the battery leaks. Try to drink away the protection circuit and leaking electrolyte.