Charge control circuit for solar

[yashrk]

 I have a couple of solar panel rated for 6v 10w (in series) i want to charge few lithium ion batteries (in parallel) of specs 3.7v 3 amps. Can u suggest a suitable charge controller circuit for above condition.

Presently I am charging batteries with LM350 @5v o/p but when I use the batteries in series it just give voltage for 5-10mins i think there is some thing wrong with lm350 but it gives perfectly right voltage of 6v and 1.6A when checked with multimeter. Please suggest any rectification or better solution to charge the lithium ion batteries. 
thank you.   

[kripton2035]

boom ! very soon...

[johnk]

kripton2035 is right 
Lithium-ion batteries have special requirements to the charger and also to the load, when they are not followed the battery can explode or catch fire!!! For example you can't charge them with 5V - they can only take 4.2V (if you're using a single cell). When discharging you need to watch the current (max. current depends on the quality of you battery) and the voltage - it shouldn't go lower than about 3.3V (per cell).
I think Dave has made a video about this topic, you should check it out.

[kripton2035]

Dawgie is right too

[yashrk]

Well I get the risk involved in it, I have an battery which has a circuit (called BMC- Battery management circuit) in it to protect it from over heating and over charger, that make me feel safer to work with them.
Actually I want to know whether its excess amount of voltage or current (at a recommended voltage) that causes "EXPLOSION" to happen ?
I actually tried to do charge the batteries directly with solar cell but the BMC (in the batteries) burned and stopped the direct current flow to the battery so I was trying  to make a power regulator to charge the batteries at recommended voltage but it was taking more time, and even though I provided them sufficient amount of time to the charge (@recommended voltage), the batteries last for just 5 min or so. 

[kripton2035]

as there are specialized chips that protects the lithium batteries, there are specialized chips that do the charge
take a look at TI, maxim, Linear they all have these kind of chips