1. Problems in the manufacturing of lithium-ion battery packs include uneven electrode coating and rough production processes.
2. The violent reaction of a short circuit generates a large amount of heat, leading to the decomposition and vaporization of the electrolyte, and the expansion of the lithium-ion battery.
3. In addition, when the polymer lithium-ion battery leader does not have time, expansion will occur because air is conductive to a certain extent. Therefore, the long release time is equivalent to direct contact between the positive and negative electrodes of the battery, and a slow short circuit is performed.
4. Reasons for poor quality of lithium-ion battery chargers: The charger uses inferior boards, refurbished or inferior parts, or has inaccurate heating or parameter drift, which causes the charging limit to get out of control, resulting in the internal gas compression of the lithium-ion battery, which leads to deformation of the battery shell, cracking during charging, or even explosion.
5. Overcharging. Overcharging can cause a large amount of gas to flush the plates, leading to the shedding of active materials from the lithium-ion battery pack, shortening battery life, accelerating water loss, affecting electrolyte decomposition, and increasing battery temperature, thus delaying full charging!
Polymer lithium-ion battery pack roller maintenance technology
I. Preparatory Work
Find a well-ventilated place and prepare a polymer lithium-ion battery, scissors, clips, toothpicks, 705 transparent silicone rubber, transparent tape, syringe, injection needle, and a piece of plastic tubing (must be the minimum).
II. Preparation of the air pump
Connect the syringe to the infusion needle, fix the needle to the seal of the lithium-ion battery pack, then secure the needle with tape, and apply a small amount of 705 silicone rubber near the needle with a toothpick to prevent air leakage.
III. Gas Extraction
Pull the syringe to expel the gas from the battery, pump out a complete tube, clamp the plastic tube of the needle with the needle, separate the syringe from the needle, and expel the gas (although the gas in the battery is non-toxic, it has an unpleasant smell, so find a well-ventilated place), then connect the syringe to the needle, and repeat the process over and over again.
IV. Sealing
After repeated operations, the aluminum film encapsulating the battery will gradually tighten and adhere to the battery body, making the polymer lithium-ion battery pack very rigid. When the gas can no longer be extracted and the inside of the battery is close to a vacuum, clamp the plastic tube behind the needle, cut a small piece of transparent tape (1 cm square) with scissors, stick it on the needle hole, press the needle down, and the operation is complete.
V. Quality Inspection
Because the pinhole is extremely small, sealing it with silicone rubber and transparent tape prevents gas from entering the battery. After several hours of silicone rubber curing, the lithium-ion battery pack is tested by charging and discharging it several times at a low current. If there are no further swelling issues, the treatment is complete. If gas still appears, you can repeat the above process and try again. If it still doesn't solve the problem, the battery is unusable. I bought over a dozen inexpensive polymer lithium-ion batteries online, and after the above treatment, they returned to normal use with excellent results.
