Pacific Automotive Network lithium iron phosphate battery with tin welding can, lithium-ion battery Pack, as far as possible to prevent the use of tin welding welding. If you really can not prevent it, you can first file the lithium-ion battery to weld the parts of the treatment, the use of rosin flux welding, soldering iron power to adjust some of the higher, quickly complete the welding action, to prevent the soldering iron long time to contact the electrode, so that not only can quickly weld, but also reduce the high temperature on the core of the damage.
But the disadvantage of tin soldering is: the solder joints are not very strong, the force may be desoldering. In addition, if the welding time is not well controlled, it is easy to damage the lithium batteries.
Some lithium-ion battery cells can be soldered directly.
The following is a categorized description, and explains why.
Solderable lithium-ion batteries:
1, polymer soft-pack batteries polymer soft-pack lithium batteries, most of which can be soldered, because its positive and negative lugs stick out longer, the temperature of the solder will not affect the interior of the lithium battery.
2, turn nickel after the square large monomer now some of the new energy vehicles power cell, there are B products of the car battery pack can not be used, it will be used for energy storage and small power class of lithium-ion battery pack products above. At this time, as long as the laser equipment to laser weld the nickel strip on the positive and negative poles can be through the soldering, in general, after the transfer of nickel square cell electrode away from the inside of the cell, so, soldering square lithium-ion batteries, high temperature impact on the core is relatively low.
Can not be soldered lithium-ion batteries:
1, not turned nickel square large monomer square large monomer, different manufacturers, positive and negative poles are also different, there are some manufacturers of positive and negative poles are aluminum; there are some manufacturers of positive poles are aluminum columns, while the negative pole is a copper column. Regardless of whether it is a copper or aluminum pole, you can't directly solder the tin, because the tin will fall off. You can only use a soft copper bar for locking screws or laser weld a soft aluminum bar.
2, cylindrical core cylindrical core should prohibit the use of solder welding.
18650 lithium-ion battery shell two levels of ordinary galvanized steel cylinder, can also be said to be stainless steel material. If you use a soldering iron to tin it is not easy, because it does not eat solder.
Cylindrical cells, also can not be directly on the surface of the cell steel shell solder! There are two important reasons, as follows: 1 soldering iron temperature of about 300 ° C or so to melt tin, if this temperature directly welded to the surface of the core steel shell, steel shell is very thin, this temperature will be directly transmitted to the inside of the core, the internal structure of the core will be subjected to a certain degree of damage, if the welding time is long, the serious core will also be exploded fire.
2The surface of the core is generally a layer of anti-rust oil, if directly on the surface of the steel shell of the core welding tin, will destroy the layer of anti-rust oil, the core will be easy to rust, affecting the life of the core.
(Photo/Writing/Photo: Pacific Auto Q&A Beast)