TP4056 BMS, Higher output alternative?  - Page 1
Forum section: electronics / beginners

author: BS3DP
author_rank: Newbie
timestamp: April 09, 2017, 07:04:38 am
content: Hey guysI know I'm new to the forum and all but iv run into a bit of a small problem. I thought I would be able to work this out myself but I just find a better solution.I'm currently building a custom Bluetooth speaker to take to work. The issue iv run into is that when using a TP4056http://www.ebay.com.au/itm/10pcs-5V-Mini-USB-1A-18650-Lithium-Battery-Charger-Board-Module-TP4056-TE584-/172338310404?hash=item282029ed04:g:yYcAAOSwknJX1U~IIv got the issue that the amp draws a little over the 1amp limit and starts losing power because the TP4056 board that's monitoring the battery pack (6 18650 cells wired in parallel) can't output more than 1amp.Is there an alternative board similar and as cheap as the TP4056 board?

author: Monittosan
author_rank: Regular Contributor
timestamp: April 09, 2017, 08:36:48 am
content: You can try the 3amp version which is just what you have in parallelhttp://www.ebay.com.au/itm/1PCS-TP4056-4-2V-3A-High-Current-Lithium-Battery-Charging-Board-Charger-Module-U-/302160585170?hash=item465a2ca1d2:g:MKgAAOSwEzxYSS~z

author: BS3DP
author_rank: Newbie
timestamp: April 09, 2017, 12:27:08 pm
content: See im not to sure because its not like i need faster charging but a higher output to allow the amp to draw enough power from the battery pack. Like is that a 3amp charging output or is that a bms that doesnt limit the appliance output.

author: Seekonk
author_rank: Super Contributor
timestamp: April 09, 2017, 05:32:21 pm
content: It is obvious you bought one of the more expensive charger boards that protects. Protects from what? You doing something stupid? If you are pretty sure you won't do that, just connect load directly to the battery. Protection We don't need no damn protection.

author: sleemanj
author_rank: Super Contributor
timestamp: April 10, 2017, 12:23:28 am
content: Quote from: BS3DP on April 09, 2017, 12:27:08 pmThat appears to be only parallel 4056's, so does not have the undervolt/overvolt/overcurrent protection.The protection is handled by the DW01 (6 pin chip) and the 8205A on the pcbk, the DW01 is the protection IC, and the 8205A is a dual mosfet.The DW01 circuits normally are configured to use the RDSon of the dual fet as it's current sense, when the current is sufficient to cause about 150mV drop across them it shuts them down.To quote from the datasheetQuote from: dw01The two levels are used for normal overcurrent (150mV dropped, TOI1) which has a delay of 10-20ms, and short circuit (1.5v dropped, TOI2) which has a 500uS delay.Anyway, the CS (Current Sense) is connected via 1k resistor to one side of the dual fets, and ground is connected to the other as you can see in the application circuit (M1 and M2 are both inside the 8205A IC)...I see no reason that you could not therefore make a small hack to your existing board to instead have a dedicated current sense resistor which you can then size according to Ohm's law to produce the required voltage drop at your desired maximum current. The 8205A should be able to handle 3A of current OK physically.I would use a sense resistor that can dissipate at least 1W.

author: BS3DP
author_rank: Newbie
timestamp: April 10, 2017, 03:20:32 am
content: Quote from: Seekonk on April 09, 2017, 05:32:21 pmUsing li-on cells should always be protected with a protection circuit because dead cells or over charged can be dangerous. Iv had cells blow up on me so of course i would use a protection circuit.

author: Seekonk
author_rank: Super Contributor
timestamp: April 10, 2017, 06:46:40 am
content: You don't know enough to know what I said.

author: zogpy
author_rank: Newbie
timestamp: January 06, 2018, 10:11:29 pm
content: Quote from: sleemanj on April 10, 2017, 12:23:28 amHi sleemanjthanks a lot for your great reply, I have added an R050 Current sense resistor as shown in the attached photoI'm using a 9 cell 2600 mAh, the output pins of the charger module are connected to a DC-DC step up converter xl6009 module, afterthe modification to the protection circuit, I'm able to get 1.37 A at 12v from the step up converter compared to 0.89 A at 12v which drops to 0(when dw01 protection activates) before the MOD, thus while connecting a load of two 12v car bulbs each drawing 2.5AI'm using the bulbs to determine the max Ambs I can get before the protection activates, the actual load is a router 12v 1.5Abut I noticed that while charging, the blue LED turns on while the battery is at 95% of charge, while when I connect another charging module (unmodified)the charging process continuous until the charge percentage reaches 98%what could cause that ?!, did I do the MOD correctly as you pointed out ?!

author: soubitos
author_rank: Frequent Contributor
timestamp: January 06, 2018, 11:16:49 pm
content: If your app needs up to 2A you might want to have a look at this module i makeTP5100FLEXADV-V2.00

author: zogpy
author_rank: Newbie
timestamp: January 13, 2018, 05:50:54 am
content: Quote from: soubitos on January 06, 2018, 11:16:49 pmThank you so much for your reply & help