20s 60v 35A battery management system bms/PCB for e-bike

Model: DL20S (3.2V Rated LiFePO4 battery bms not for 3.7V rated Li-ION Battery bms)

We can customize any PCB from 1S to 30S lithium batteries with different current.

1. Overview

DL20S60V25A/35A/45A/60A PCB is used for 20 series 60V LiFePO4 battery pack.

We can design it for various lithium batteries like LiFepo4, LiMn2O4, and Li-polymer etc.

The main functions are: over charge protection, over discharge protection, over current protection, short-circuit protection, temperature protection etc.

According to the customer request we can develop PCM in different sizes and structures.

BMS manufactured by  high quality Mos and IC imported . Keep your battery long cycle serivce life time.

2. Advantage

Use top quality (A-level) protective integrated circuit IC, from the solution of Seiko of Japan.

Strong load ability, constant discharge current 25A/35A/45A/60A, use high voltage resistance, low inner

resistance power Mosfet. The heat sink will greatly help cooling.

IC itself has power balancing function. The circuit is simple and reliable.

Typical voltage detection for each cell. So each battery will be prevented over charged or over discharged. Over current and short circuit protection.

function is very reliable.Long time short circuit of the load won't affect the PCB and the battery.Temperature protection during charging and discharging.

Extreme low power consumption. The consumption of the whole device is less than 50uA.

PCB use high anti-corrosion, high water resistance, high impedance ESD conformal Coating.

FQA
1.What is the common port and separate port? what is the difference?

We take 13S48V16A BMS as an example, common port 16A means your charge   cathode and discharge cathode are connected in the same point end(our P-),   charge cathode and discharge cathode are used in the common connection port, so the charge current and discharge current are the same 16A. while the   separate port is separately connected by charge cathode (C-) and discharge   cathode (P-),  so the charge current and discharge current are different,   discharge current 16A, charge current 8A.
 
2.What is the balance function?
The working principle and function are as followings, when your one cell voltage   is upto alarm voltage(Li-ion upto 4.18V, Life Po4 upto (3.6V), then the cell Balance   starts to work, balance resistance starts discharge with 35ma(when balance  discharge starts to work, BMS will starts a little heat up, which is the normal   reflection), the cell is in both charging and discharging status, and others which   are not reached to alarm voltage(Li-ion 4.18V, Life Po43.6V)are only in charging  status, no discharging, when the fast cell voltage is reached to alarm voltage  (Li-ion 4.25V, Life Po43.75V)BMS starts off power protection, all the other cells are all in stop of charging, this process will enable your battery charging in   balance current, and your battery voltage are in balance status, but when your   cell voltage difference are in a big range, then balance can not be functionning well.
 
3.The relationship between Battery capacity and BMS current?
There is no direct relationship between  Battery capacity and BMS current, big   capacity doesn`t mean a big battery, but rely on continue current, that is to say   if your engine is powerful, your should choose high current of BMS, it is not relied  on battery capacity.
 
4. What type of charger should  I choose?
Lithium battery must choose specific charger, do not use   Charger for Leadacid battery, for leadacid charger may have MOS with high   pressure breakdown protection, which will not protect of BMS over charge.  Life Po4 battery charger voltage=battery string No.X3.6V, while Li-ion battery   charger voltage=Battery string No.X4.2V.
 
5. What current BMS should I choose ?
Take 10S36V as an example: what current BMS you choose is relied on your   E-bicycle Motor power and current limitation of controller. eg., choose 16A for   below 350W, 25A for below500W, 35A for below 800W, 60A for Below 1000W,   higher than 1200W are contact with our service specialist for suggestions, one   inall, continue current shall be higher than current limitation in Controller.
 
6. Whether my BMS damaged?
if you want to judge if the BMS is damaged, please take the folowing steps, to   test if each cell voltage is the same with voltmeter? if the cell voltage difference   is over 1.0V, the fault is displayed that it cannot run far, no power supply at the start range, short charge time, all these issues are almost caused by battery cells,   if BMS damaged is displyed as no charge, no discharge, no discharge while the   battery has voltage.