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After the battery is bulging, it will affect its use and cannot be placed in the phone or digital camera. In addition, the presence of gas between the battery plates can also affect the charging and discharging capacity of the battery. After deflation, it can be restored to its original size and used normally.

Choose the lithium battery near the bottom edge of the sealed cover (be careful not to drill holes at the bottom of the battery as there is no space there), and avoid drilling holes at the electrodes.

The following picture shows two electrodes on both sides, which need to be drilled in the middle. They are both aluminum shells, and can be drilled by hand with a very fine instrument screwdriver. After drilling through, be sure to go deep to avoid danger from touching the electrode plate, etc.

If you're lucky, you'll hear the sound of gas running out after piercing through. If you're not lucky, there won't be any movement. This type of battery can't be used anymore and needs to be replaced.

After puncturing the eyes, squeezing the bulging area with your hands can help to expel gas between the plates.

Finally, seal it with adhesive to prevent air from entering. Some 705 silicone rubber sealant can also be used.

You can see that there is reserved space at the front end of the lid

If the wrong position is tied, the battery may experience local short circuit, ignition, and heating. This position is not suitable for drilling.

The battery itself is damaged (referring to the battery cell itself), and the interior of the cell is a vacuum structure. Once the exterior is damaged, the battery is not far from being damaged, and the most direct phenomenon is bulging.

Battery overcharging, which is widely known, is caused by poor charging of the charger. When the voltage of the battery cell exceeds 4.25V, it will basically bulge. A high-performance battery cell may discharge for a while and the voltage will drop, but in severe cases, it may not be able to recover. Even if external force flattens it, it is useless (and external force is generally difficult to flatten it, which is the reason for vacuum, or completely sealing it is more accurate)

It's battery over discharge, and the standard for over discharge is that the voltage of the battery cell is below 2.7V. Generally, many battery cells have bulging phenomenon after the voltage is below 2V. If it is below 1V, it is basically scrapped!

In addition to the above three points, there are also some unpredictable factors, such as instantaneous high voltage during charging (possibly exceeding 5V) and instantaneous high current (such as infinite current caused by short circuit).

If the float charging voltage is set too high and the charging current is high, it will accelerate the oxygen precipitation on the positive electrode plate, making it difficult to recombine at the negative electrode. At the same time, the temperature inside the battery will also rise quickly. When the exhaust pressure reaches a certain level, the valve controlled sealed lead-acid battery will experience bulging deformation.

During the charging operation of valve controlled sealed lead-acid batteries, especially in series battery packs, if the battery pack is overcharged, poor quality batteries often exhibit internal gas recombination and other phenomena, resulting in bulging. Based on the above situation, users should reduce the float charging voltage and charging current when using valve controlled sealed lead-acid batteries; Do not use batteries of poor quality.

I'm very certain that I can't deflate! When sealing, it is vacuum sealed to prevent water from entering. You don't have vacuum conditions at home, even if you do, there is no laser welding. Besides, when sealing, the square aluminum shell is vacuum smashed steel balls, and the soft polymer is vacuum heated and fused with PP layer.

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