Until now, some people still use soldering irons to solder lithium batteries. They find it very convenient and feel that they can be used normally after the battery pack comes out. Operating in this way is very dangerous. Soldering with a soldering iron can easily lead to a degradation in the quality of the battery pack, a shortened service life, and in severe cases, it can cause the battery to explode.
Let’s talk about the dangers of directly welding lithium battery cells with a soldering iron:
As we all know, the working principle of the electric soldering iron is to convert electrical energy into heat energy and melt the tin wire at high temperatures to achieve the welding effect. Inevitably, the high temperature of the soldering iron will cause damage to the battery during the welding process.
The internal materials of the battery core will change due to high temperatures:
No.1 Electrolyte deterioration
Deterioration of the electrolyte will also cause the internal resistance of the battery to increase, thereby reducing the battery’s capacity and battery life, thereby affecting the battery’s life. Once the battery life is shortened, the battery needs to be replaced more frequently, increasing the cost of use.
If the electrolyte deteriorates seriously, the internal pressure of the battery will increase and even cause an explosion, thus posing a threat to personal safety.
No.2 diaphragm shrinkage
The separator in a lithium battery has electronic insulation and can ensure mechanical isolation between the positive and negative electrodes of the cell. If the separator shrinks, the mechanical isolation function will fail. The small shrinkage of the separator will cause a micro-short circuit in the positive and negative electrodes, resulting in increased battery power consumption, reduced cycle times, faster life decay, and reduced battery capacity. For example, a 3000mAh battery will soon drop to 2000mAh, and the battery life will be reduced. sexual decline. If the diaphragm shrinks to a large extent, it will directly cause a short circuit between the positive and negative poles, which will cause a direct fire and explosion, which is very dangerous.
Therefore, it is strongly recommended that you do not use a soldering iron to weld the battery cores. DIY enthusiasts can use a manual spot welder to perform spot welding, and pay attention to testing the pulling force to ensure that the battery cores are spot welded properly. Production factories use automatic spot welding machines for welding.
If you have any questions about battery core welding, please feel free to contact us!